Before the reaction of hydrogen peroxide, if a reagent had changed color immediately after being added to the sample, this would indicate the presence of a contaminant and the test would be invalid.
The above experiment is also knowns as a presumptive blood testing experiment in which if a contaminant is present, the test should be deemed invalid if a vivid blue or purple color appears after adding the TMB reagent but before adding the hydrogen peroxide; this is also frequently referred to as a "false positive" result.
Presumptive tests catalyze the oxidation of a chromogenic substance, which results in a color change, by reacting with the hemoglobin of all blood in humans and animals. If the test is positive, the material will be identified as potentially blood, though not necessarily human blood.
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Use this equation for the next question.
Mg(OH)2 + NaCl ® MgCl₂ + NaOH
How many hydrogen atoms are on the reactant side?
000
1
02
4
8
There are two atoms of hydrogen on the reactant side of the equation.
What is a reaction?What we try to show on paper are the changes that substances can undergo. A reaction is said to occur when two or more substances are combined together. The combination of the substances would now lead to the rearrangement of bonds and then the formation of a new product.
We know that it is one of the rules of writing a balanced chemical reaction equation that the number of the atoms of each element on the reactant side must be the same as the number of atoms of the same element on the products side.
When we look at the reaction as shown, we can see that the reaction is balanced hence we can be able to find the number of atoms of hydrogen on the reactants side by doing an atom count.
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if the solubility of iron (iii) hydroxide is 1.49e-10 moles/liter, what is the ksp of iron (iii) hydroxide?
Mo Iron's polarity is calculated. Hydroxide. Thus, we must translate this into moles. One additional F b o H 30 H will get you to Surrey. Over 2.80 L, the molar mass was 5.8 grams.
Working out at 1.40 times 10 to the minus 52.80 times 10 to the minus five. I'll get either 1.1 or 1.1.10 multiplied by 10 to the negative 14. Put the KSP value into action.
What is Hydroxide ?A diatomic anion with the chemical formula OH is hydrogen oxide. It has a negative electric charge and is made up of two atoms of oxygen and hydrogen that are bound together by a single covalent bond. It is a crucial yet typically insignificant component of water. It serves as a base, ligand, nucleophile, catalyst, and nucleophile.
If the pOH of the solution is known, it is possible to determine the hydroxide ion concentration in an aqueous solution, [OH-], in mol L-1. The amount of hydroxide ions in the solution decreases as the pOH rises. The amount of hydroxide ions in the solution rises as the pOH drops.
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which equilibrium reaction will experience a shift towards the products in equilibrium position when the concentration of ni2 is increased?
Reaction Ni²⁺(aq) + 6NH₃(aq) ⇌ [Ni(NH₃)₆]²⁺ will experience a shift towards the products in equilibrium position when the concentration of Ni²⁺ is increased.
What is equilibrium shift?According to Le Chatelier's Principle: When the equilibrium is stressed, the response changes to relieve the stress. This means that adding a reactant moves the equilibrium away from the reactant to the right. Adding a product moves the equilibrium away from the product and to the left.
Equilibrium type:
Stable equilibrium.Unstable equilibrium.Neutral equilibrium.As the concentration of Ni²⁺(aq) increases, the system attempts to reach equilibrium by reducing the increased coefficient according to Le Chatelier's principle. To do this, the concentration of Ni²⁺(aq) must be lowered. Therefore, it is necessary to lower the Ni²+(aq) concentration by promoting forward reaction.
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The given question was incomplete so the complete question is as follows:
Which equilibrium reaction will experience a shift towards the products in equilibrium position when the concentration of Ni2+ is increased? View Available Hint(s) Which equilibrium reaction will experience a shift towards the products in equilibrium position when the concentration of is increased?
Ni(OH)₂(s)⇌Ni²⁺(aq)+2OH⁻(aq)
[Ni(H2O)₆]²⁺(aq)+3En(aq)⇌[Ni(En)₃]²⁺(aq)+6NH₃(aq)
Ni²⁺(aq)+6NH₃(aq)⇌[Ni(NH₃)₆]²⁺
NiS(s)⇌Ni²⁺(aq)+S²⁻(aq)
calculate the ph of an aqueous solution that contains 0.293 m sodium sulfite and 0.236 m sodium hydrogen sulfite.
The pH of an aqueous solution is -0.7459
Let the total volume of the solution where both the mixture of aqueous solution of sodium sulfide and sodium hydrogen sulfite are present be V
no. of moles of H+ coming from Na2S,H20 = 18 * 0.293 * V
no. of moles of H+ coming from NaHS = 0.236 * V
Final concentration of H+ will be
Cf = (18 * 0.293 * V) + (0,23 * V) / V
Cf = 5.57
pH = - log [5.57]
pH = - 0.7459
Negative pH occurs when the molarity of hydrogen ions in a strong acid is greater than 1N (normality)
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consider one glucose unit in glycogen. what is the overall or net reaction for the conversion of this unit into 2 pyruvate, starting with phosphorolysis of the glucose unit?
This cycle is known as Glycolysis
Glycolysis is the 10 step process, which occurs in cytoplasm of cell and is conversion of glucose to pyruvate.
There are several steps and enzymes that is required in glycolysis pathway.
STEP 1: PHOSPHORYLATION
This is irreversible reaction.
Here glucose is phosphorylated to glucose 6 phosphate with the help of enzyme hexokinase and 1 ATP is utilized.
STEP 2 : ISOMERISATION
The isomerization of Glucose-6-phosphate to Fructose-6-phosphate, done with the help of enzyme phosphoglucoisomerase.
STEP 3 : SECOND PHOSPHORYLATION
Fructose-1,6-bisphosphate is phosphorylated to Fructose 1,6 bisphosphate which is catalyzed by phosphofructokinase and cost another ATP.
STEP 4: BREAKDOWN
The fructose-1,6 bisphosphate is breaken down too produce two 3carbon molecules - Glyceraldehyde-3-phosphate, or GADP, and a molecule of Dihydroxyacetone phosphate or DHAP.
The reaction is catalyzed by aldolase.
STEP 5 : CONVERSION OF DHAP INTO GADP
DHAP is oxidized to form GADP.
The reaction is catalyzed by triose phosphate isomerase enzyme.
STEP 6: OXIDATION
Here 2 mol. of GADP are oxidized.The GDAP is converted to 1,3 bisphosphoglycerate with the help of glyceraldehyde phosphate dehydrogenase. This requires NAD+ and a free phosphate.
STEP 7: DEPHOSPHORYLATION
First substrate level phosphorylation ( addition of phosphate to ADP to give ATP )
1,3 bisphosphoglycerate with the help of Phosphoglycerate kinase become 3-phosphoglycerate and will produce 1 ATP.
STEP 8: PHOSPHATE TRANSFER
The phosphate ester linkage in 3 phosphoglycerate is moved from 3 C to 2 , because of low free energy to form 2 phosphoglycerate with the help of phosphoglycerate mutase .
STEP 9: DEHYDRATION
2 phopshoglycerate is dehydrated by enolase to form Phosphoenolpyruvate ( PEP)
This is reversible reaction.
STEP 10: SECOND DEPHOSPHORYLATION
2 substrate level phosphorylation which gives out ATP.
Non - oxidative phosphorylation.
Here Phosphoenolpyruvate ( PEP) is converted to last product of glycolysis pyruvate releasing ATP by pyruvate kinase.
The first five step is production of GADP, And usage of ATP and the next five steps are the formation of ATP and pyruvate. The net formation of ATP is 2 mol. of ATP and 2 mol. of NADH. This pyruvate then move to the TCA cycle.
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How is a covalent structure formed
explain what is happening at a molecular level during the dutch-process. b. rank the molecules from least likely to be present after the dutch process to most likely to be present after the dutch process. c. using the information above and your knowledge of acid-base chemistry provide an explanation for your rankings that addresses how you used structure to solve this problem. do not just quote pka values.
a) the Dutch process at the molecular level Pyrol and benzyl alcohol do not react with NaOH.
b) The molecules are ranked from those that are least likely to be present after the Dutch process to those that are most likely to be present after the Dutch procedure Pyrrol is more likely to be present than butyric acid, which has a lower likelihood of being there.
c) Butyric acid's carboxylic acid is removed using NaOH.
The acidic chemicals with a bitter taste are washed in the Dutch procedure using a strong base like NaOH. Basic substances are not cleansed and only very acidic substances are washed thoroughly. However, vanillin is only somewhat acidic, thiophenol is less acidic, butyric acid is acidic, benzyl alcohol is neutral, and pyrrol is basic.
a) Benzyl alcohol and pyrrol do not react with NaOH. However, butyric acid combines with it to produce sodium butyrate (CH₃CH₂CH₂COONa), vanillin creates its sodium salt ((2-OCH₃,4-CHO)C₆H₃ONa), and thiophenol creates sodium benzenethiolate (C₆H₅SNa).
b) Butyric acid is least likely to be present and pyrrol is most likely to be present. Butyric acid is followed in increasing order of presence by vanillin, thiophenol, benzyl alcohol, and pyrrole.
c). NaOH is used to wash away the carboxylic acid in butyric acid. Due to the aromatic ring, vanillin and thiophenol are acidic and combine with NaOH to generate a sodium salt that is water soluble. Because it is neutral and pyrrole is basic, neither benzyl alcohol nor pyrrole will react with NaOH.
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why do primary alkyl halides typically undergo sn2 substitution reactions more rapidly than do secondary or tertiary alkyl halides
The SN2 reaction proceeds most quickly for primary carbons and there's less steric congestion for all of this backside assault.
Secondary as well as tertiary alkyl halides undergo the SN2 reaction more slowly than primary alkyl halides. Since there were only three little hydrogen atoms present, methyl halides interact in SN2 reactions the fastest among the simple alkyl halides.
Due to the fact that tertiary carbocations comprise three alkyl groups and secondary carbocations only have two, the former is more stable. Based on the inductive effect, tertiary carbocation is therefore more stable that secondary carbocation.
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chemicals that change behavior or mood by directly affecting activity of the postsynaptic cell are referred to as t
Chemicals that change behavior or mood by directly affecting activity of the postsynaptic cell are referred to as neurotransmitter
In a chemical synapse the postsynaptic membrane is the membrane that receives a signal from the presynaptic cell and respond via depolarization or hyperpolarization and neurotransmitter play an important role in neural communication and they are chemical messengers that carry massages between nerve cell and other cell in your body and influencing everything from mood to involuntary movements and monoamine neurotransmitter such as dopamine are the most important neurotransmitter in the pathophysiology of mood disorders
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silicon nitride (si3n4) is made by a combining si and nitrogen gas (n2) at a high temperature. how much (in g) si is needed to react with an excess of nitrogen gas to prepare 125 g of silicon nitride if the percent yield of the reaction is 95.0%?
The amount of Si needed to react with an excess of nitrogen gas to prepare 125g of silicon nitride if the percent yield of the reaction is 95% is 88.20 g.
We know that,
Percentage (%) yield = ( actual yield /theoretical yield ) × 100
Using this we can derive that,
Theoretical yield = (Actual yield / Percentage(%) yield) × 100
= (125 / 85) × 100 = 147.06g Si₃N₄
The mole ratio of Si: Si₃N₄ = 3 :1
Grams of Si required to produce 147.06 g Si₃N₄,
= ( 3 mole Si /1 mol Si₃N₄) ( 28.05 g Si /1 mole Si) * (1 mole Si₃N₄, /140.3 g Si₃N₄,) *147.06 g Si₃N₄
= 88.20 g Si
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4. If the relative molecular mass of CH₂O is 60, calculate its empirical formula. (C = 12, H = 1, O=16)
If the relative molecular mass of CH₂O is 60, the molecular formula of the compound would be [tex]C_3 H_6O_3[/tex].
Molecular formulaThe empirical formula of a compound is the formula based on the simplest whole number ratio of the component atoms. The molecular formula could be in multiples of the empirical formula.
The empirical and the molecular formulas of a compound are related by the following equation:
[empirical formula]n = molecular formula
Where n = molecular formula mass/empirical formula mass
In this case, the relative molecular mass is 60. The empirical formula mass can be calculated as:
CH₂O = (12) + (2x1) + (16)
= 40 g/mol
Thus:
n = 60/40
= 1.5
Therefore, the molecular formula would be: [CH₂O]1.5 which is equivalent to [tex]C_3 H_6O_3[/tex]. This is because atoms combine in simple whole number ratios.
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Discuss energy use in animals. In your discussion, be sure to :
- Identify the type of protein molecules used to digest food
- Identify the organelle where energy from nutrients is released
- State one inference that can be made concerning a cell that has many of these organelles.
The type of protein molecules that is been used to digest food in the organism are:
chymotrypsin trypsin .The organelle where energy from nutrients is released is the Mitochondria.
One inference that can be made concerning a cell that has many of these organelles is that te utilization of the energy is balanced.
What is the organelle where energy from nutrients is released?The organelle where energy from nutrients is released is the Mitochondria , this organelles can be described as the one that look tiny inside cells and this is very essential in the cell because it helps in the p[roces of releasing energy from food.
It should be noted that this process is been refferd to as process of cellular respiration and this is the reason why the biologist do referred to mitochondria as the powerhouses of the cell because it involves the use of energy.
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Determine which base will work to deprotonate each compound in an acid/base extraction.
Bases that are useful for deprotonating compounds are:
NaHCO₃ or NaOH.
metal alkoxide
Sodium hydroxide
Benzene rings with carboxylic acids that are weak acids can be prepared using NaOH or NaHCO 3 due to the weakness of the carboxylic acid. deprotonated.
Metal alkoxides such as potassium tert-butoxide can be used to deprotonate benzene rings with three carbon chains attached to one carbon. Also, metal alkoxides are used because the benzene ring containing the hydroxyl group is a very weak acid.
A benzene ring with a hydroxyl group is a weak acid like a benzene ring with a carboxyl group, so it can be deprotonated with NaOH.
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suppose that 60 ml of 0.1 m naoh is required to completely neutralize the amine group of glycine in an analyte solution. what quantity of glycine is present in the analyte?
The quantity of glycine present in analyte as measured by titration is 3mmol.
This titration calculation can be done using dimensional analysis. All values should first be converted to scientific notation: 60 mL NaOH is equal to 6 x 10-2 L NaOH. 1 x 10-1 mol NaOH/L NaOH is equal to 0.1 M NaOH. For every mole of glycine present in the analyte, 2 moles of NaOH have been supplied at the second equivalence point. This is due to the fact that one OH- was necessary to scavenge the COOH group, and a second OH- was required to scavenge the amine. To take this into consideration, we must adjust our computation. Finally: (6 x 10-2 L NaOH) x (10-1 mol NaOH / L NaOH) x (1 mol glycine / 2 mol NaOH) = 3 x 10-3 mol = 3.0 mmol glycine.
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what is the sum of all the coefficients in this reaction when properly balanced? lead (ii) nitrate hydrogen sulfide yields lead (ii) sulfide nitric acid (hno3)
The sum of the coefficients involved in the equilibrium reaction equation is 5.
the equilibrium reaction equation is A chemical reaction is said to be balanced when the number of atoms of an element on the reactant side is equal to the number of atoms on the product side. You can check this by doing an atomic count.
When trying to solve this problem, the first step that must be taken is to obtain a balanced reaction equation. Because that's the key to what we're trying to get here. Now you can see the balanced reaction equation for the reaction and then get the total.
[tex]Pb(NO3)_2 + H_2S = > 2 HNO_3 + PbS[/tex]
The sum of the coefficients of the equilibrium reaction equation is 1+1+2+1=5.
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when an ionic compound is added to water, the will be attracted to the partially positive h atom of water and the will be attracted to the partially negative o atom of water. as the compound dissolves the ions separate from each other, a process called .
The process by which the ions are attracted to water and separate from each other when dissolved in water is called dissociation.
What is dissociation of ions in water?
The ionic salts when added to water dissolve in water by dissociation. The ions in the ionic compound break the bond between them and get dissolved in water. Water molecules reduce the electrostatic force between the ions and solvate them by surrounding them.
The positive ions of the ionic compound gets attracted to hydroxide ion of water which is negatively charged. The positive ion of the ionic compound gets attracted to protons in water which are positively charged. the ions in ionic compound dissolve by dissociation.
Therefore, due to dissociation the ionic compound dissolves in water and get attracted to opposite charges in water.
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Which effect of the chemical industry is a positive one? (1 point)
O acid rain
O advancements in medicine
O building manufacturing
O pollution of water
In an ecosystem, the effect of the chemical industry which is a positive one is advancements in medicine.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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the chemical formula for beryllium oxide is . a chemist measured the amount of beryllium oxide produced during an experiment. she finds that of beryllium oxide is produced. calculate the number of moles of beryllium oxide produced. be sure your answer has the correct number of significant digits.
The number of moles of beryllium oxide BeO are 2.228 moles.
The chemical formula for beryllium oxide is given to be BeO.
The mass of the amount of beryllium oxide formed is 555.7 grams.
we are asked to find the number of moles,
The moles are given by the mass of the substance divided by the molar mass of the substance.
Mass = Mass formed/molar mass
Mass of BeO formed = 55.7 grams.
Molar mass of BeO = 25g/mol.
Putting values,
Moles of BeO = 55.7/25
Moles of BeO = 2.228 moles.
So, the number of moles of beryllium oxide formed are 2.228 moles.
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Complete question - the chemical formula for beryllium oxide is BeO. A chemist measured the amount of beryllium oxide produced during an experiment. she finds that 55.7 grams of beryllium oxide is produced. calculate the number of moles of beryllium oxide produced. be sure your answer has the correct number of significant digits.
What mass of hydrogen is produced when 195mg of potassium is added to water?
The mass of hydrogen that will be produced when 195 mg of potassium is added to water would be 5 mg.
Stoichiometric problemFrom the balanced equation of the reaction:
[tex]2K + H_2O --- > 2KOH + H_2[/tex]
The mole number of the potassium that reacts to the mole of the hydrogen gas that is produced is 2:1.
If 195 mg of potassium reacts:
1 mg = 0.001 g
195 mg = 195 x 0.001
= 0.195 g
Recall that: mole = mass/molar mass
Molar mass of potassium = 39 g/mol
mole of 0.195 g potassium = 0.195/39
= 0.005 mol
From the stoichiometric mole ratio, the equivalent mole of hydrogen gas produced would be:
0.005/2 = 0.0025 mol.
Molar mass of hydrogen gas = 2 g/mol
Mass of 0.0025 hydrogen gas = 0.0025 x 2
= 0.005 g
0.005 g = 0.005 x 1000
= 5 mg
This means that 0.005 g or 5 mg of hydrogen gas will be produced when 195 mg of potassium is added to water.
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water dissolves salts because it: select one: a. is hydrophobic, and salts are also hydrophobic. b. forms covalent bonds with the atoms of the salt crystal. c. has partial positive and negative charges. d. evaporates quickly at room temperature.
Salts get dissolved in water because it has partial positive and negative charges. So option (c) is correct.
Why does salt dissolves in water?The water molecules pull the Na and Cl ions apart while breaking the ionic bond which held them together. After the salt ions are pulled apart, they get surrounded by water molecules. The salt dissolves to form a homogeneous solution.
The slightly positive portion of sodium is attracted to the slightly negative portion of oxygen on the water molecule. At the same time, the slightly electronegative chlorine moieties of NaCl are attracted to the slightly electropositive hydrogen moieties of water.In either case, no true bond is formed, the stronger covalent bonds of water (also commonly held by hydrogen bonds between water molecules) win, NaCl gets pulled apart, resulting in dissociation of Na+ and Cl- ions with the Na+ and Cl- ions setting loosely in place between the intact H₂O molecules. NaCl is then dissolved.Salts are ionic and are expected to dissolve in water because water itself is polar. Therefore, ionic salts are expected to dissolve in polar solvents.
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describe the relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly
The relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly is because of its wavelength
When a molecule interact with light and energy is absorbed and the molecule is said to be excited and the transition occurs which take the molecule from an initial state to a higher energy state and if wavelength of light from a certain region of the spectrum are absorbed by a material then the material will appear to be the complementary color and if violet light with wavelength of 400nm is absorbed then the material will look yellow and if the material absorbs blue then the orange color are seen
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What can you say to the movie san andreas you've watch?
It appears that your answer contains either a link or inappropriate words. Please correct and submit again!
This is what it keeps saying when I want to answer so I have commented my answer below:
pls help and explain why
The picture shows the balancing of chemical equations. The balanced chemical equation of the reaction is:
2 Na + 2 H₂O ---> 2 NaOH + H₂What are balanced chemical equations?Balanced chemical equations are equations in which the number of moles of atoms of elements that are reacting is equal to the number of moles of atoms of the elements that are produced.
The balancing of chemical reactions follows the law of conservation of mass which states that matter cannot be created nor destroyed but can change from one form to another.
Hence, in a balanced chemical equation, the mass of the reactants is equal to the sum of the mass of the products.
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what is the ph of a solution made by mixing 40.00 ml of 0.100 m hcl with 25.00 ml of 0.100 m koh? assume that the volumes of the solutions are additive.
The pH of the solution which was made by mixing 40ml of 0.100 M HCL with 25.00ml of 0.100 M KOH is 1.669.
The base and the acid have the same molarity, but the acid's volume is more than the bases' volume, hence after mixing the resultant solution is acidic.
The concentration of OH⁻ solution in the mixture is
= (molarity of base * volume of base - molarity of acid * volume of acid) / total volume
= (40 mL*0.1M - 25 mL *0.1 M ) / (40 mL +25mL)/ 1000)
= 0.021428571 M
pH = -log(0.021428571) = 1.669
Hence the pH is 1.669
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explain how bones are classified by shape
Bones are classified into Five according to shape namely: Long bones, short bones, flat bones, iregular bones, sesamoid bones.
What is a bone?These are living tissues that contain their own blood vessels and are comprised of different cells, proteins, minerals, and vitamins. They make up the body's skeleton.
Bone classification according to shape:
Long bones: They are long, wide, and cylindrical in shape. They act as leveres e.g Femur, tibia, fibula, metatarsals, humerus, ulna, radius, metacarpals, and phalanges.Short bones: They are thick and cubic in shape. They give support and allow motion. eg. Carpals, tarsals.Flat bones: They appear Thin, and curved. Muscles are attached to them. They protect delicate internal organs.eg. Sternum, ribs, scapulae, and cranial bones.Irregular bones: They have complex shaped and also protect internal and delicate organs. eg. Vertebrae, facial bones.Sesamoid bones: They are small, round and are seen in tendons. They guard the tendons against the force of compression. eg. Patellae.Learn more about Bones on https://brainly.com/question/24169840
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the conversion of carbon dioxide to carbonic acid can be catalyzed by carbonic anhydrase with an activation energy of 85.6 kj mol-1at 25c. by what factor will the rate constant increase if the temperature is raised to 37c?
7.133 is the rate constant increase if the temperature is raised to 37c.
factor=rate(T2)/rate(T1) .
The proportionality constant (k) that links the pace of the reaction to the concentrations of reactants is known as the specific rate constant. For any chemical reaction, the rate law and the particular rate constant must be ascertained through experimentation. Temperature affects the rate constant's value.a chemical reaction in which two or more substances interact and change into new ones, or where one substance transforms into another.
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atoms from which of the following pairs are most likely to form an ionic bond? a) carbon and oxygen b) silicon and oxygen c) sodium and oxygen d) sulfur and oxygen
Atom pairs that are most likely to form an ionic bond is sodium and oxygen.
Thus, the correct option is C.
What is an ionic bond?А pаir of elements will most likely form аn ionic bond if one is а metаl аnd one is а nonmetаl. These types of ionic compounds аre composed of monаtomic cаtions аnd аnions. We cаn check the periodic tаble to see thаt the cаtions аre monаtomic ions formed from metаls, аnd the аnions аre monаtomic ions formed from nonmetаls.
Sodium is a metal, and oxygen is a nonmetal; therefore, [tex]N_{2} O[/tex] is expected to be ionic.
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TRUE OR FALSE equilibrium constant (Keq) is the ratio of the mathematical concentration products over reactants.
Answer: True
Explanation: The value of the equilibrium constant indicates whether or not a reaction is favorable. Reactions for which Keq is greater than one are favorable, meaning that the reactants are higher in energy than the products and signifying that energy is released as the reaction proceeds.
Calculate the time it will take to deposit 1 mole of silver if a current of 6A is passed through a solution of silver trioxonitrate (v) (F=96500)
Help!!!
The time taken to deposits one mole of silver if a current of 6 ampere is passed through the silver trioxonitrate solution is 16083 seconds or 283 minutes.
What is electrolysis?Electrolysis is the process of converting electrical energy into chemical energy. If current is passed between two electrodes which are immerse in an electrolyte solution, the metal which is reduced will deposited at the cathode.
The weight of the deposited metal w related with its equivalent weight z, current I and time t is :
w = zIt /96500.
One mole of silver is 108 g. Its equivalent weight also be 108 g Thus the time t is calculated as follows:
108 g = 108 × 6 × t /96500
t = 96500/6
= 160835 seconds or 268 minutes.
Hence, the time taken to deposits one mole of silver in this electrolysis is 268 minutes.
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give 4.5 moles of cr and 6.0 moles of n2, how many grams of cr2n3 (mw 146 g/mol) can be formed? 4 cr 3 n2 --> 2 cr2n3
Cr is the limiting reagent & the amount of Cr2N3 produced depends on the limiting reagent.
2 mol of Cr produces 146g of Cr2N3
1 mol ———————- 146/2g of Cr2N3
4.5 mol ——————- 146 x 4.5/2g of Cr2N3
=328.5g of Cr2N3
What is a Limiting Reagent?
The limiting reactant is the reagent (compound or element) to be totally consumed in a chemical reaction. Limiting reactants is also what prevents a reaction from continuing because there is none left.Thus, 328.5 g of cr2n3 can be formed.
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