Answer:
true
Explanation:
In 2 hours, it went 60 metres. 60 / 2 = 30 so true
What is the general term for the process in which a chemical species gains electrons?
Reduction is the general term for the process in which a chemical species gains electrons
The number of electrons attached to an atom or group of atoms increases during a reduction, a type of chemical reaction. One material is provided with electrons by another, which is oxidized as a result of the reduction.
One of the atoms participating in the chemical interaction between two chemicals gains electrons during reduction, which is a type of chemical reaction. The term refers to the element that receives electrons since the element that gains electrons have a lower oxidation state. A chemical species lowers its oxidation number during a half-reaction known as reduction, typically by acquiring electrons.
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6. What is the expected product from the reaction of potassium with oxygen?
О ко
О K2O2
О K2O
KOz
Answer:
K2O2 and KO2 is the answer
Answer:
C.) K₂O
Explanation:
Potassium (K) always forms the cation K⁺.
Oxygen (O) always forms the anion O²⁻.
The ionic compound these two ions form must have an overall charge of 0. However, the dissimilar charges on the ions do not cancel out (+1 + (-2) = -1). Therefore, you need to have two K⁺ ions in the compound to balance the charges (+1 +1 + (-2) = 0).
how many grams of nacl ( 58.44 g/mol) are needed to make 250.0 ml of a 1.50 m solution of nacl?
Answer:
21.92 gm
Explanation:
A 1.5 M solution would have 1.5 * 58.44 = 87.66 gm per liter
you only need 1/4 of this (250 ml) = 21.92 gm
calculate the weight of CO having the same number of oxygen atoms as are present in 22g of CO2.
The mass or the weight of the substance is given as the product of moles and molar mass. The weight of CO as the same oxygen atom in carbon dioxide is 28 gm.
What is mass?Mass of the substance has been given by the moles and the molar mass of the substance and also by the Avogadro's number (Na).
It is known that the molar mass of carbon dioxide is 44, and 1 mole of it will contain 44 gm or 6.022 × 10²³ molecules.
In a carbon dioxide molecule oxygen has 2 atoms so,
6.022 x 10²³ molecules of CO₂ = 2 × 6.022 x 10²³ atoms of Oxygen
so, 44g of carbon dioxide = 2 × 6.022 × 10²³ atoms of Oxygen
22 gm of carbon dioxide will also have 6.022 × 10²³ atoms of Oxygen
1 mole of carbon monoxide = 28 gm
So, 28 gm will have 6.022 × 10²³ atoms of Oxygen and will weigh 28 gm.
Therefore, the mass of carbon monoxide is 28 gm.
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Explanation:
1 mol of CO2=12+32=44 g
Number of oxygen in 1 molecule of CO2=2
Therefore, 44 g CO2 contains 2 moles of oxygen
22 g CO2 contains =442×22=1 mole oxygen atom
1 mole of CO=12+16=28 g
∴ 28 g CO contains 1 mol oxygen atom.
You're going on a plane from Alaska to Florida and you're taking your bike. It's the middle of the winter. You fill up your tires before you leave to a pressure of 2.72
atm on a day that is -7.50°C. When you arrive in FL at 38°C, you check the pressure in your tires before you ride, what do you find the pressure to be?
Type your answer with the proper number of significant figures and proper units in the space below.
Answer:
2.3 atm
Explanation:
-7.50°C = 265.5 K
38°C = 315 K
(2.72)(265.5)=(pressure)(315)
pressure = 2.3 atm
Natalie observes these characteristics in the model of an atom. (i) includes positive charge (ii) contains electrons (iii) explains the photoelectric effect (iv) suggests the probable location of electrons
Natalie is observing electron cloud model of an atom.
What is electron cloud model?The electron cloud model is a representation of an atom that has a small, massive nucleus that is encircled by a cloud of electrons that are traveling quickly. According to the electron cloud model, although we can never be certain of an electron's precise location, it is more likely that they are in certain regions.It is created by Erwin Schrodinger.Due to the uncertainty principle, the electron cloud model establishes the zone of probability describing the electron's location.The electromagnetic force pulls the electrons of an atom toward the protons in the nucleus. The electrons are constrained by this force inside an electric potential well surrounding the smaller nucleus, therefore an external energy source is required for the electron to escape.Learn more about electron cloud model here:
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Calculate the ph after 10. 0 ml of 0. 40 m naoh is added to 20. 0 ml of 0. 50 m hcl.
The pH after 10. 0 ml of 0. 40 M NaOH is added to 20. 0 ml of 0. 50 M HCl is 13.3 .
Calculation ,
[ [tex]OH^{-}[/tex] ] = [tex]M_{1} V_{1} -M_{2} V_{2} /V_{1} +V_{2}[/tex]
where M is molarity and V is the volume .
[ [tex]OH^{-}[/tex] ] = 0. 50 M × 20. 0 ml - 0. 40 M × 10. 0 ml / 10. 0 ml +20. 0 ml
[ [tex]OH^{-}[/tex] ] = 6/30 = 0.2
pOH = -㏒[ [tex]OH^{-}[/tex] ] = -㏒ 0.2 = 0.7
pH = 14 - pOH = 14 - 0.7 = 13.3
Therefore , the pH after 10. 0 ml of 0. 40 M NaOH is added to 20. 0 ml of 0. 50 M HCl is 13.3 .
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A monosaccharide that consists of 5 carbon atoms, one of which is in a ketone group, is classified as a(n) _______
A monosaccharide that consists of 5 carbon atoms, one of which is in a ketone group, is classified as a(n) ketopentose.
Ketone family
The suffix "-one" is added after locating the carbonyl group and, if necessary, designating it with a location number. Ketones are given their common names by first identifying the alkyl groups linked to the carbonyl (in alphabetical order), followed by the prefix "ketone." Several Regular Ketones. The three most significant ketones in terms of scale are acetone, methyl ethyl ketone, and cyclohexanone. Though less frequently than in general organic chemistry, they are still widespread in biochemistry. The simplest ketone is dimethyl ketone, or CH3COCH3, often known as acetone.
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A 2. 00 g sample of cocl2. x h2o is dried in an oven. when the anhydrous salt is removed from the oven, its mass is 1. 565 g. what is the value of x?
It is Cobalt(II)chloride dihydrate. The value of x is 2.
First, we have to determine the mass of H₂O that was evaporated upon heating which will be = 2.00g - 1.56 g
= 0.435 g
So,
CoCl₂ + x.H₂O → CoCl₂.xH₂O
Molecular mass of CoCl₂ = 129.839 g/mol
Molecular mass of H₂O = 18 g/mol
Weight of sample after heating = 1.565 g
Weight of H₂O evaporated = 0.435 g
Hence,
[tex]18x = \frac{129.839X0.435}{1.565} \\x = \frac{55.48}{28.17} \\x = 1.9[/tex]
x ≈ 2
So, it is Cobalt(II)chloride dihydrate.
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sketch two amino acids side by side
The sketch of two amino acid side by side is given above.
What is amino acid?Amino acid is defined as the acid which contains two functional groups which are carboxylic group, -COOH and ammine group, -NH2.
When the two or more than two molecules of amino acids join together by forming peptide bond, they produces polypeptide chain or protein.
What is peptide bond?The bond which is present inbetween two amino acid is called a peptide bond.
The peptide bond is defined as a chemical bond which is formed inbetween the two or more molecules when nitrogen which is present in one amino acid react with the carbon of another amino acid by releasing a molecules of water.
Thus we concluded that the two amino acid bond by forming peptide bond.
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There are 30.974 grams of phosphorus in one mole. approximately how many atoms of phosphorus are there in one mole? (5.01) 6.02 × 1023 c. 6.02 × 10-23 5.145 × 10-23 d. 1.86 × 1025
There are approximately 6.02 × 10²³ atoms of phosphorus in one mole of 30.974 grams of phosphorus (option A).
How to calculate number of atoms?The number of atoms of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number. That is;
no of atoms = no of moles × 6.02 × 10²³
According to this question, there are 30.974 grams of phosphorus in one mole of phosphorus. The number of atoms can be calculated as follows:
no of moles of P = 30.974g ÷ 31g/mol = 0.99mol
number of atoms = 0.99 mol × 6.02 × 10²³
number of atoms = 6.02 × 10²³ atoms
Therefore, there are approximately 6.02 × 10²³ atoms of phosphorus in one mole of 30.974 grams of phosphorus.
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Which atom absorbs more energy- one in which an electron moves from the the second shell to the third shell, or an atom which an electron moves from the first to the third shell?
An atom which an electron moves from the first to the third shell atom absorbs more energy.
An atoms may occupy different energy states . The energy states are discrete , that means they occur at specific values only. Therefore an atom can only move to a new energy level if it absorbs or emits an amount of energy that exactly corresponds to the difference between two energy levels.
The lowest possible energy levels that the atom can occupy is called ground state.The energy levels which is higher to the ground state is called excited state.
The more energy absorb when electron move from first to third because in this second energy level have to pass to reach at third energy level.
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The process of releasing silver iodide into the atmosphere to stimulate rainfall is called:?
If you have 200. 0 g of radioisotope with a half-life of 5 days. How much isotope would remain after 15 days?
If you have 200. 0 g of radioisotope with a half-life of 5 days. 25g of isotope would remain after 15 days
Isotopes are members of an element family that have the same number of protons but differ in the number of neutrons. The atomic number of an element on the Periodic Table is determined by the number of protons in its nucleus. Carbon, for example, has six protons and has atomic number 6.
Radioisotopes are elemental radioactive isotopes. They can alternatively be defined as atoms with an unstable neutron-proton combination or surplus energy in their nucleus.
Radioisotopes are critical components of medical diagnostic techniques. They can be utilized for imaging to examine the dynamic processes taking place in various sections of the body when combined with imaging devices that register the gamma rays emitted from within.
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The oxygen used for preheating and the fuel gas are combined in the ____ chamber before burning.
Answer:
Mixing chamber
What substance is produced at the cathode during the electrolysis of molten calcium bromide, cabr2cabr2? assume standard conditions
Magnesium (Mg) metal is the substance produced at the cathode.
As molten calcium bromide is electrolyzed, calcium (Ca) metal is the substance produced at the cathode.
Due to the fact that oxidation always takes place at the anode and reduction always occurs at the cathode,
Consider the two cations that were produced in the two ionisation processes of the two substances: mathrm Ca +2 and mathrm Mg +2. The following is how to express two cations' potential cathode reactions:
[tex]ca { }^{ + 2} + (aq) + 2e {}^{ - } - > \\ ca(s)E {}^{0} _{ca {}^{ + 2} \div ca } = - 2.87v[/tex]
[tex] Mg{ }^{ + 2} + (aq) + 2e {}^{ - } - > \\Mg(s)E {}^{0} _{Mg {}^{ + 2} \div Mg} = - 2.37v[/tex]
[tex] Mg^{ + 2} [/tex]
will be reduced quickly since it has a low electronegative electrode potential.
Thus, magnesium (Mg) metal is the substance produced at the cathode.
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Calculate the mass of 3.4 moles of nitric acid (hno3). explain the process or show your work by including all values used to determine the answer.
Answer:
6.34917360^25g
Explanation:
It's been a while since I've done this type of problem so I'm not making any promises that its right hahaha, but I hope it helps anyway. Please let me know whether I'm right or not!
The whole cloves are broken up to help release the eugenol during distillation.
a. true
b. false
The statement is False.
No, whole cloves are not broken up to help release the eugenol during distillation.
Steam distillation:
Live steam is used in the co-distillation technique of steam distillation to separate mixture components. It works well to extract essential oil constituents with high boiling points, such as those with boiling points of 200°C. However, the oil vapors themselves are warmer—around 100°C—helping to maintain the compounds' structural integrity. It enables distillation to be carried out at lower temperatures than the boiling points of the constituent parts. The high-boiling essential oils are vaporized by steam, and after passing through a cooling system, the hot vapors that were formed from them condense back into a liquid along with water. A two-phase distillate, consisting of a water layer and an oil layer, is created because the oils are immiscible in water.Learn more about the Steam distillation with the help of the given link:
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Explain how a redox reaction involves electrons in the same way that a neutralization reaction involves protons.
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species.In oxidation loss of electrons takes place and in reduction gain of electrons is takes place whereas nuetralization reaction is a reaction in which an acid and a base react to form water and a salt and involves the combination of [tex]H^{+}[/tex] (proton) and [tex]OH^{-}[/tex] to generate water.
The neutralization reaction is not a redox reaction is because in nuetralization reaction there is no transfer of electron takes place where as in redox reaction there is no exchange of electrons between atoms. Moat bond forming and breaking redox reaction requires the concomitant transfer of protons.
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In the molecular orbital model of cyclobutadiene, how many -antibonding molecular orbitals are there?
There are one antibonding molecular orbitals present in molecular orbital model of c.
The cyclobutadiene has a pi system comprised of four individual atomic p - orbital and thus should have a four pi molecular orbitals. The compound is the prototypical antiaromatic hydrocarbon with 4 [tex]\pi[/tex] - electrons . Its rectangular structure is the result of jahn teller reaction which disorder the molecule and lowers its symmetry , converting the triplet to a singlet ground state. It is a small annulene . The delocalisation energy of the [tex]\pi[/tex] electrons of the cyclobutene is predicted to be zero .
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A welding torch requires 602.1 L of ethylene gas at 2.77 atm. What will be the pressure of the gas if ethylene is supplied by a 110.6 L tank?
Starting with the partially balanced equation, ch3cooh(l) ?o2(g)→2co2(g) 2h2o(l) what coefficient should be placed in front of o2 to balance the oxygen atoms?
The coefficient that should be placed in front of O₂ to balance the oxygen atoms is 2.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
The given equation is
CH₃COOH (l) + O₂ → 2CO₂ (g) + 2H₂O(l).
Reactant Side Product Side
C = 2 C = 2
H = 4 H = 4
O = 4 O = 6
The number of atoms of O in the reactant side is 4 and the number of atoms of O in the product side is 6. So multiply by 2 to balance the oxygen atoms.
CH₃COOH (l) + 2O₂ → 2CO₂ (g) + 2H₂O(l).
Reactant Side Product Side
C = 2 C = 2
H = 4 H = 4
O = 6 O = 6
Now the given equation is balanced the number of atoms in reactant side is equal to the number of atoms in the product side.
Thus from the above conclusion we can say that The coefficient that should be placed in front of O₂ to balance the oxygen atoms is 2.
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You are asked to weigh approximately 0. 4g of acetylsalicylic acid to the nearest mg. When you enter the data in grams in your lab notebook, how many significant figures will you record ?.
Number of significant figures will be 1
Given:
weight of acetylsalicylic acid = 0. 4g
To Find:
significant figures
Solution: Significant figures are the digits of value which carry meaning towards the resolution of the measurement. They are also called significant figures in chemistry. All the experimental measurements have some kind of uncertainty associated with them.
When we convert 0.4g acetylsalicylic acid to mg we get value 400mg
when we convert 400mg to gram we get value of 0.4 gram
Since 0 before a decimal is not significant so there is only one significant figure that is 4
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The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a ________ group
The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a Carboxyl group.
What is the Carboxyl Group ?The carboxyl group is an organic functional group. Carboxyl group contains two functional groups that is carbonyl group (C = O) and hydroxyl group (OH) which attached with single carbon atom. The structural formula for carboxyl group is RCOOH where R is alkyl or aryl group.
Example of Carboxyl group: HCOOH (Methanoic Acid) , CH₃COOH (Ethanoic acid) etc.
Thus from the above conclusion we can say that The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a Carboxyl group.
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Formic acid is as a preservative and antibacterial agent in livestock feed. the pka of formic acid is 3. 75. what is the reaction of formic acid (ch2o2) with water?
Formic acid (ch2o2) on reaction with water undergoes dissociation reaction.
Formic acid is the acid released by ant when it bites which causes us irritation.
It's formula is CH2O2 or HCOOH. and pH is 3.75.
In the case of dehydration, one hydrogen atom in the water molecule joins the hydroxyl group in the trans formic acid to form a new water molecule, while the hydrogen bonded to carbon in the acid breaks off to regenerate a water molecule.
Formic acid dissociates in water according to the equation:
HCOOH (aq) + H2O (l) = H3O + (aq) + HCOO- (aq)
Formic acid is the simplest carboxylic acid, containing a single carbon. Occurs naturally in various sources including the venom of bee and ant stings, and is a useful organic synthetic reagent. Principally used as a preservative and antibacterial agent in livestock feed.
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A mixture of 10. 0 g of Ne and 10. 0 g ar have a total pressure of 1. 6 atm. What is the partial pressure of Ne?
Answer:
1.1 atm
Explanation:
moles of neon = 10.0g /20.2g/mole =.495 mole
moles of ar = 10.0 g /39.9 g/mole= .251 mole
the partial pressure of each is determined by their mole fractions of the entire mix
Ne .495 mole / (.495 + .251 mole) * 1.6 atm =
1.1 atm ( to two significant figures)
What is the mass of a 32.5-ml sample of ethanol? the density of ethanol is 0.789 g/ml.
Answer:
25.6 grams of ethanol in 32.5 ml of the substance.
Explanation:
The density of ethanol can be used as a conversion factor. We know that:
Ethanol is 0.789 g/ml. That becomes a conversion factor that we may write as (0.789 g/ml) and then convert either grams ethaanol or ml ethanol into the other unit. We are given volume of ethanol: 32.5 ml.
Note that when we multiply (0.789 g/ml) by (32.5 ml) the ml unit cancels, leaving just grams. That's what we want, so:
(0.789 g/ml)(32.5 ml) = 25.6 grams of ethanol in 32.5 ml of the substance.
Tritium, or 3h, has a half-life of 12. 32 years. imagine a sample of tritium is prepared. (a) what fraction of the sample will remain 3. 80 yr after its preparation?
(a) 0.807 fraction of the sample will remain 3. 80 yr after its preparation of tritium.
What is half life?Half life is the time taken for the radioactivity of a substance to fall to half its original value whereas mean life is average lifetime of all the nuclei of a particular unstable atomic species.
So if a radioactive element has a half life of one hour, this means that half of it will decay in one hour. After another hour, half of the remaining material will decay.
Example:
The radioactive isotope cobalt-60, which is used for radiotherapy, has, for example, a half-life of 5.26 years.
Tritium half life = 12.32 (T half)
Formula :
N/N₀ = (1/2) ^ t/T (N/N₀ = Fraction ratio)t = 3.84 T = 12.32N/N₀ = (1/2) ^ 0.308N/N₀ = 0.807(a) 0.807 fraction of the sample will remain 3. 80 yr after its preparation of tritium.
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i need help pleaseee help please! <3
(a) The temperature goes up by 3⁰C.
(b) There is increase in temperature, so the reaction is exothermic.
(c) Examples of exothermic reaction include, rusting of Iron, burning of coal, reaction of strong acid and water.
(d) Examples of endothermic reaction include, melting solid salts and evaporating liquid water.
What is exothermic reaction?
Exothermic reaction is a type of chemical reaction in which energy is transferred to or from the surroundings.
Examples of exothermic reactions include the following;
Rusting of IronBurning of CoalReaction of Strong Acid and WaterWater and Calcium ChlorideWhat is endothermic reaction?Endothermic reaction is a type of chemical reaction in which energy is absorbed from the surroundings.
Examples of endothermic reactions include the following;
Melting solid salts.Evaporating liquid water, etcChange in temperatureFrom the increase in temperature from 15⁰C to 23⁰C, we can conclude that the temperature goes up by 3⁰C.
20⁰C - 17⁰C = 23⁰ - 20⁰C = 3⁰C.
Since there is increase in temperature, the reaction is exothermic.
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Which of the following is true: A. Gamma rays are too dangerous to be used in a medicinal way. B. Gamma radiation is used commonly used in smoke detectors C. Gamma radiation should never be used on food products. D. Gamma radiation is frequently used on food to kill bacteria.
Answer:
D
Explanation:
Gamma radiation penetrates the cell wall of prokaryotic organisms such as bacteria and can inhibit their metabolic functions as well as destroy their DNA.
Debunking the other answers:
A is incorrect as Gamma radiation is used in the treatment of cancer via radiotherapy.
B is incorrect as Gamma rays are too small and would just penetrate any smoke particles.
C is incorrect because Gamma rays are used to disinfect food products to prevent food borne illness. Irradiation is safe to use on food and does not make it radioactive.
Thus, D is correct.
