Answer:
2.41 molecules.
Explanation:
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CaF2 (s) <--> Ca2+(aq) + 2F- (aq)
What is the solubility constant when the concentration of Ca2+ is 0.002M and the concentration of F- is 0.004M?
When the concentrations of Ca2+ and F- are 0.002M and 0.004M, respectively, the solubility constant will be 3.2x [tex]10^{-8}[/tex].
What does a solution's concentration mean?The amount of solute that has been dissolved in a specific volume of solvent or solution is measured by the solution's concentration. A solution that contains a significant amount of dissolved solute is said to be concentrated.
What is an example of concentration?You can determine how much solute has been dissolved in the solvent by looking at the concentration of the solution. For instance, the concentration could be stated as 1 teaspoon of salt per 2 cups of water if you add 1 teaspoon to 2 cups of water.
Given that,CaF2(s) <==> Ca 2+(aq) + 2F- (aq)
Solubility constant(Ksp) is written as
Ksp = [tex][Ca^{2+} ][F-]^{2}[/tex]
Ksp = [tex][0.002][0.0004]^{2}[/tex]
Ksp = 3.2x[tex]10^{-8}[/tex]
So, the Solubility constant is 3.2x[tex]10^{-8}[/tex].
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How many moles of solute are in 750 ml of 4.9 M (Molar$ CaCI2? How many grams of CACI2 is this?
According to the explanation given in a previous session, now we have to use the same molarity formula to find the number of moles of CaCl2, let's set up the formula and add the values:
M = n/V
4.9 = n/0.750
n = 4.9*0.750
n = 3.675 moles of CaCl2
Now to find the mass in grams, we need both the number of moles, 3.675 moles, and also the molar mass of CaCl2, which is, 110.98g/mol
110.98g = 1 mol
x grams = 3.675 moles
x = 407.85 grams of CaCl2
Calculatetheamountofiron(III)oxideina74gsample.
Answer
0.46 molesExplanation
Given:
Mass of iron (III) oxide sample = 74 g
What to find:
The amount (mole) of iron (III) oxide in a 74 g sample.
Solution:
The amount (mole) of iron (III) oxide in a 74 g sample can be calculated using the mole formula.
[tex]Mole=\frac{Mass}{Molar\text{ }mass}[/tex]Using the molar masses of Fe = 55.845 g/mol, and O = 15.999 g/mol.
The molar mass of Fe2O3 = (2 x 55.845) + (3 x 15.999) = 159.687 g/mol
Putting mass = 74 g and molar mass = 159.687 g/mol, the amount will be
[tex]Mole=\frac{74\text{ }g}{159.687\text{ }g\text{/}mol}=0.463406539\text{ }mol[/tex]Therefore, the amount of iron (III) oxide in a 74 g sample is approximately 0.46 moles.
A solution (a mixture of liquid) contains 63.55g of Cu and 96g of Sulfate. What is the percent Cu in the solution.
The percent of copper in solution is 39.8% when a solution contains copper and suphate.
What is a solution and how the percent of copper in the solution is calculated out to be so?A solution is a homogenous mixture of two or more components that dissolve in the solvent.Here in this question is given the mass of copper that is 63 g and the mass of sulphate that is 96 g.The molecular mass of copper sulphate would be 63.55 g + 96 g = 159.55 g.Now to calculate the percent of copper present in copper sulphate is given by 63.55/ 159.55 x 100 = 39.8%.So here is the answer that is 39.8% copper is present in the solution.To know more about solution visit:
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combination: K(s)+Br2(l)⟶Express your answer as a chemical equation
Explanation:
The reaction between potassium (K) and bromine (Br2) produces potassium bromide (KBr).
K + Br2 --> KBr
Now we need to balance the equation. For this, we need to equate the atoms of each element on both sides of the equation.
So in the reactants side:
K - 1
Br - 2
Products side:
K - 1
Br - 1
Let's multiply KBr by 2:
K(s) + Br2 → 2KBr(s)
Now we need to balance K:
2K(s) + Br2 → 2KBr(s)
Let's count again:
Reactants side:
K - 2
Br - 2
Product side:
K - 2
Br - 2
2K(S) + Br2 → 2KBr(S)
Answer: 2K(s) + Br2 → 2KBr(s)
What could cause bond angles to differ between molecules ?
• We need to take into consideration that many factors lead to variations from the ideal bond angles of a molecular shape. Size of the atoms involved, presence of lone pairs, multiple bonds, large groups attached to the central atom,
• In this instance,, Option 2,3,4, are applicable in order to cause bond angles to differ between molecules.
Which of the four fundamental forces holds the nucleus together?OA. Electrostatic forceOB. Force of gravityO C. Strong nuclear forceOD. Weak nuclear force
Answer:
C. Strong nuclear force.
Explanation:
First, let's review the definitions of the given concepts of the group of answer choices:
- Electrostatic force: It's the interaction that occurs between electrically charged particles (positive and negative charges).
- Force of gravity: is a fundamental interaction where there is a mutual attraction between all things that have mass or energy.
- Strong nuclear force: is what keeps nuclei together (protons and neutrons together).
- Weak nuclear force: this force is responsible for particle decay.
Based on these definitions, the force that holds the nucleus together would be C. Strong nuclear force.
Atoms of nonmetals react with both metals and other non metals
A. true
B. False
The chemical formula for hydrogen peroxide is H202. Which modelrepresents a molecule of hydrogen peroxide?
Answer
The model which best represents a molecule of hydrogen peroxide (H2O2) is option B.
How do elements cycle through the atmosphere?
The elements cycle through the atmosphere is biogeochemical cycle. In atmosphere different types of cycle are revolving around.
What is biogeochemical cycle?The biogeochemical cycle is refer to the exchange of substances between biotic and abiotic sources.
It can also be defined as the process by which a chemical material circulates through Earth's biotic and abiotic regions.
There are six types of biogeochemical cycle.
Water cycleCarbon cycleNitrogen cycleOxygen cyclePhosphorous cycleSulphur cycleThus, the elements cycle through the atmosphere is biogeochemical cycle. In atmosphere different types of cycle are revolving around.
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Water can be made using the reversible reaction shown. Which change would
keep this reaction from shifting to form more of the product?
2H₂+022H₂O + energy
A. Increasing the concentration of H₂ gas in the reaction vessel
B. Decreasing the temperature in the reaction vessel
C. Removing the H₂O from the reaction vessel as it forms
D. Increasing the temperature in the reaction vessel
Decreasing the temperature in the reaction vessel keep this reaction from shifting to form more of the product.
As we know that rate of reaction is directly proportional to the concentration of the reactant.
If we increase the concentration of H2 then the rate of reaction increases. So, we keep it constant. Therefore this option is wrong.
By removing the H₂O from the reaction vessel as it almost make no change in the reaction. This can be pursuited the reaction in which product again converted into product.
By increasing the temperature we increases the rate of reaction and equilibrium shift in the forward direction.
Thus, we concluded that by decreasing the temperature in the reaction vessel keep this reaction from shifting to form more of the product.
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what was mendeleevs predictions for germanium
Answer
Mendeleev predicted the properties of undicovered elements such as Germanium. He ddeuced based on the gaps in the periodic tbl
can you help me gain a complete understanding of what chemically occurs during the electrolysis of copper sulfate using copper for both electrodes? the copper sulfate in this situation is dissolved in water. thank you
In electrolysis, the anode is positively charged while cathode is negatively charged
So, Cu2+ moves towards the negative electrode which is cathode
while SO42- moves towards anode
Since cathode(being negatively charged) rich in electrons, Cu2+ gains 2 electrons and sticks to the electrode and becomes Cu (solid form)
While, on anode, SO42- should go to loose electrons but this doesnt happen as it requires lot of energy to do that (overvoltage)
Instead, anode (which is itself made of Cu) starts loosing electrons and starts dissolving to release Cu2+ ions (as this process will require less energy)
So, in the electrolysis of CuSo4 using Cu electrodes,
Cathode reaction: Cu2+ + 2 e ---> Cu
Anode reaction: Cu ---> Cu2+ + 2e
The electromagnetic spectrum shown in the diagram below is describing which type of energy?
The electromagnetic spectrum shown in the diagram is describing radiant energy.
What is an electromagnetic spectrum?The electromagnetic spectrum shows the total range of frequencies or wavelengths that electromagnetic radiation covers or occurs.
The electromagnetic spectrum usually arranges all forms of electromagnetic radiation from that having the shortest wavelength or highest frequency to that having the longest wavelength or lowest frequency or vice versa.
The electromagnetic spectrum shown arranges electromagnetic radiation from gamma rays to radio waves.
All forms of electromagnetic radiation possess radiant energy.
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Identify the limiting reagent in this reaction using a starting amount of 20.0g of each reactant. Show your work
The balanced equation is:
2C(s) + 3H2(g) --> C2H6(g)
The molar mass of C is 12.01 g/mol.
The molar mass of H2 is 2.02 g/mol.
We can see from that the limiting reactant from the question is carbon.
What is the limiting reactant?The limiting reactant is the reactant that would determine when the reaction would stop. This is so because that reactant is present in the least amount in the system.
Given that;
Number of moles of carbon = 20.0g/ 12.01 g/mol = 1.67 moles
Number of moles of hydrogen = 20.0g/2.02 g/mol = 9.9 moles
Given that 2 moles of carbon reacts with 3 moles of hydrogen
1.67 moles of carbon reacts with; 1.67 moles * 3 moles / 2 moles
= 2.51 moles
Hence the limiting reactant is carbon.
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in terms of volume, how do ml and cm³ relate to one another?
Answer: 1 mL = 1 cm^3
Explanation:
This is a common conversion, 1 mL equals 1 cm^3. They are the same volume.
25 Lorax equals how many schlopp
We produce trash. Every time we produce something, waste is typically produced. That trash was referred to by Dr. Seuss as "Gluppity Glup" and "Schloppity-Schlopp." Whatever we choose to call it, waste can become a problem if it isn't handled appropriately.
Schloppity Schlopp, what is he? In The Lorax?We produce trash. Every time we produce something, waste is typically produced. That trash was referred to by Dr. Seuss as "Gluppity Glup" and "Schloppity-Schlopp." Whatever we choose to call it, waste can become a problem if it isn't handled appropriately.
What abilities did The Lorax haveAxe ManTotal name Unknown.Alias. A Lorax. Lorax. Origin: Mustache (by Once-ler). A Lorax.Occupation. The Truffula forest's defender.Powers/Skills. Immortality. superior intelligence, hobby. the preservation of the Truffula woodland. frightening the Once-lerGoals. With his life, defend the truffula woodland (ongoing).Family. zero knownWhat is the Lorax image's equivalent in schlopp?Using the literary device of personification to create relatable characters for industry (as the Once-ler), the environment (as the Truffula trees), and environmental activism, the tale is widely regarded as a fable on the danger of avarice causing human damage of the natural environment.
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Draw a diagram depicting the energy transitions described in #1 be sure to label ground state exited state absorbing energy giving of light and the electron
The ability to exert a force that causes an item to move is what is meant by the definition of energy as the "power to accomplish work." Even though the definition is unclear, the meaning is clear: energy is simply the force that moves things.
What is the proper energy y for various transitions?Following is the order of energy needed for excitation of various transitions. Transition n* uses the least energy, whereas transition * uses the most energy. Since the n* transition has a larger wavelength, it takes the least energy.
A periodic table can be used to predict electron configurations. The least energetic and most stable configuration is the ground state configuration. A higher energy configuration is called an excited state configuration (it requires energy input to create an excited state). The electrons used in bonds are valence electrons.
An electron receives and releases energy in the form of light energy during transition. The energy change E Delta E E of the electron is equal to the energy of the photon E E E absorbed/released during the transition.
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Not a timed or graded assignment. Quick answer showing what whole numbers I need to put in = amazing review
ANSWER
[tex]CF_4+2Br_2\text{ }\rightarrow CBr_4+2F_2[/tex]STEP-BY-BY STEP EXPLANATION:
Given equation
[tex]CF_4+Br_2\text{ }\rightarrow CBr_4+F_2[/tex]To balance the above equation, we will need to apply the law of conservation of mass
The next process is to assign variables to each of the reactants and products
[tex]\text{aCF}_{4\text{ }}+bBr_2\text{ }\rightarrow cCBr_4+dF_2[/tex]For carbon
we have 1 carbon atom at the reactant side and 1 carbon atom on the product side
Mathematically
a = c
For Fluorine
We have 4 atoms of fluorine at the reactant side and 2 atoms of fluorine at the product side
4a = 2d
For Bromine
we have 2 atoms of bromine on the reactant side and 4 bromine atoms on the product side.
2b = 4c
Since a = c
Therefore, a = 1 and c = 1
2b = 4c
Recall that, c = 1
2b = 4
Divide both sides by 2
2b/2 = 4/2
b = 2
we also know that, 4a = 2d
a = 1
4(1) = 2d
4 = 2d
Divide both sides by 2
4/2 = 2d/2
d = 2
Therefore,
a = 1
b = 2
c = 1
d = 2
Drake is studying samples of cheeks cells under the microscope. How can you classify HPO (high power objectives) according to its function?
Scanning, because it makes the viewed specimen better than the original.
Manipulating because it supports the specimen.
Illuminating because it makes the viewed specimen clearer
Magnifying because it makes the specimen viewed bigger
High power objectives according to its function is that it is Magnifying because it makes the specimen viewed bigger. That is option D.
What is a microscope?Microscope is defined as a laboratory instrument that has the ability to magnify objects placed before it which an ordinary eye can not observe.
There are various type of microscope which include the following:
Simple microscope.Compound microscope.Electron microscope.Stereomicroscope.Scanning probe microscope.The microscope makes use of its various lens to magnify the object that is placed before it. The various power of objectives include:
Low power objectives: This involves the use of ×10 objective lens to focus and observe the cheek specimen on the microscope stage.High power objectives: This is the use of a higher objective lens such as the ×40 to observe the features of the cheek cells.Therefore, according to the function of a high power objectives, it makes images appear bigger and magnified.
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A 3.75 g piece of gold initially at 587.15 K is dropped into 20.6 mL of water at 295.75 K. Calculate the final temperature (in K). Assume that all heat transfer occurs between the gold and the water. The specific heat of water is 4.184 J/g*K and the density of water is 1 g/mL. The specific heat of gold is 0.129 J/g*K.
A 3.75 g piece of gold, initially at 587.15 K, is dropped into 20.6 mL of 295.75 K water. The final temperature is 291.4 K.
What is temperature?Temperature is defined as a measure of hotness or coldness expressed on any of several arbitrary scales and indicating the direction in which heat energy will spontaneously flow that is, from a hotter to a colder body.
To calculate the final temperature
ΔT = T1 - T2
Where T1 = 587.15 K
T2 = 295.75 K
ΔT = 587.15 - 295.75
ΔT = 291.4 K
Heat capacity of gold is
q = mcΔT
q = 3.75 x 0.129 x 291.4
q = 140.96 J
Thus, a 3.75 g piece of gold, initially at 587.15 K, is dropped into 20.6 mL of 295.75 K water. The final temperature is 291.4 K.
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Write the balanced equation for the reaction that corresponds to the deltaHf for water
The equation of the enthalpy of the formation of water is:
H₂O (g) + ¹/₂ O₂ (g)----> H₂O (g)
What is the enthalpy change for the formation of water?The enthalpy change for the formation of water refers to the heat changes that occur when a mole of water is formed from its constituent elements.
The equation for the formation of water is given below:
2 H₂O (g) + O₂ (g)----> 2 H₂O (g)
The enthalpy of the formation of water, ΔHf, is -249 kJ.
A water molecule s formed from the hydrogen gas and oxygen gas reacting with a mole ratio of 2 : 1.
The reaction of the formation of water is an exothermic reaction, hence, the enthalpy of the formation of water, ΔHf, has a negative value.
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Balance the following
Answer:
Your coefficients (the numbers in front of the molecule) will be the following from left to right.
1. 1 - 2 - 1 - 2
2. 2 - 1 - 2 - 2 - 1
3. 2 - 4 - 1
4. 2 - 4 - 3
5. 2 - 2 - 2 - 1
6. 1 - 1 - 1
7. 2 - 1 - 2
8. 3 - 1 - 2 - 3
9. 3 - 1 - 2 - 3
10. 2 - 1 - 1 - 1
Explanation:
To balance this equations first count how many times an element is on each side and then see what needs to be changed in order to balance them.
A chemical reaction produces 0.379 mol of neon gas at STP.
What is the volume of the sample of neon gas?
Volume of the sample of neon gas is 8.48L
Volume can be calculated by multiplying mole of gas with molar gas volume and the neon gas is the inert gas which is present in group 18 of the periodic table used in electric sign and florecent lamp
Here given data is 0.379 mol of neon gas at STP
Formula to calculate volume
Volume = n×Vm
Where n = number of moles
Vm = molar gas of volume at STP
Put the given value in the formula then
V = 0.379 mol × 22.4L/mol
V = 8.48L
Volume of the sample of neon gas is 8.48L
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Which sentence best summarizes the law of conservation of mass?
OA. All reactants in a chemical reaction have the same mass, and all
the products have the same mass.
B. The volume of the reactants equals the volume of the products in
a chemical reaction.
OC. The total amount of mass does not change during a chemical
reaction.
OD. The types of atoms can change during a chemical reaction, but
their masses cannot.
The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.
The law of conservation of mass states that in a chemical reaction the mass neither be created nor be destroyed.
for example :
CH₄ + 2O₂ -----> CO₂ + 2H₂O
the mass of reactants is = 16 g + 64 g = 80 g
the mass of products is = 44 g + 36 g = 80 g
it is clear from the above that :
The mass of reactants = The mass of Products
Thus , The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.
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If both gases are at the same temperature, which one has the greater pressure?
1. gas 1 because the particles are moving much faster
2. gas 1 because it has fewer particles that are close together
3. gas 2 because it has more particles that are colliding
4. gas 2 because the particles have more space between them
From the images, the gas 2 has a greater pressure compared to gas 1 because it has more particles that are colliding.
What is gas pressure?The term pressure of a gas refers to the force with which the gas hits the walls of the container. We know that the pressure of the gas depends on the number of the molecules of the gas. According to one of the gas law, the pressure of the gas is directly proportional to the number of moles of the gas.
We now have to look at the image properly. It is clear that the image that is on the right hand side has more gas molecules thus it has a greater pressure compared to the gas on the left hand side.
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please solve for me
Do you think it will be harder to get the strong magnets to “change phase”? Explain.
Yes, it will be harder to get the strong magnets to change phase because the molecules are tightly packed together.
What is a Magnet?
This is referred to as a material which has the ability to produce its own magnetic field and consists of north and south poles. It is usually made from substances such as iron and is usually hard.
In a magnet, the like poles repel and the unlike poles attract and in this scenario, it will be harder to get the strong magnet to 'change phase' as a result of the atomic structure of the substances involved.
They are in the form of solids, which means that there is very little or no space between the atoms. This translates to a higher force of attraction and strong bonding thereby making it the most appropriate choice.
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PLEASE ANSWER I am begging seriously
A student pipettes 5 ml of vinegar into a erleyenmeyer flask, adds indictator and 25 ml of distilled water and titrates it with 0.1098M naoh. calculate the concentraion of acetic acid in the vinegar if the intitial volume reading on the burrette was 1.35 ml and the final reading is 37.83ml
The calculated concentration of the acetic acid neutralized is 0.134 M.
What is the concentration ?In this case, the task that we have is to obtain by calculation what would be the concentration of the acetic acid that is need to neutralize 0.1098M of sodium hydroxide solution.
Given that;
Total volume of the vinegar = 5 ml + 25 mL = 30 mL
Molarity of the sodium hydroxide = 0.1098M
Volume used for neutralization = 37.83ml - 1.35 ml = 36.48 mL
Applying the relation;
CAVA/CVB = NA/VB
CAVANB = CBVBNA
CA= CBVBNA/VANB
CA = 0.1098 * 36.48 * 1/30 * 1
CA = 0.134 M
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Question 1Propane gas is commonly used in household grills, barbecues, and camping stoves. Heat for these stoves is produced through thecombustion of propane gas (C3Hg) in the presence of Oz which produces carbon dioxide (CO2) and water (H2O). The density of thispressurized propane gas is usually around 0.52 kilograms of propane per liter. If you use 0.2 L of propane gas during a cookout,how much carbon dioxide in grams does this reaction produce? (Assume 02 is in excess)Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.a416 gb 3128C2088d 104 gUnanswereda Savemartian
Answer:
[tex]312\text{ g}[/tex]Explanation:
Here, we want to get the mass of carbon (iv) oxide produced
We start by writing the equation of reaction as follows:
[tex]C_3H_{8(g)}\text{+5 O}_{2(g)}\text{ }\rightarrow\text{ 3CO}_{2(g)}\text{ + 4H}_2O_{(g)}[/tex]Now, we need to get the mass of propane that reacted
We can get that by multiplying the density of propane by its given volume
Mathematically, we have that as:
[tex]\begin{gathered} 0.52\text{ }\times0.2\text{ = 0.104 kg} \\ 1000\text{ g = 1kg} \\ 0.104\text{ kg = 0.104 }\times\text{ 1000g = 104 g} \end{gathered}[/tex]From here, we get the actual number of moles of propane that reacted
We can get that by dividing the mass by the molar mass of propane
The molar mass of propane is 44 g/mol
The number of moles is thus:
[tex]\frac{104}{44}\text{ mol}[/tex]From the balanced equation:
1 mole of propane gave 3 moles of carbon (iv) oxide
104/44 mol will give x moles
We have the value of x as:
[tex]x\text{ = }\frac{104}{44}\times\text{ 3 = }\frac{312}{44}\text{ mol}[/tex]To get the mass of carbon (iv) oxide produced, we multiply the number of moles above by the molar mass of carbon (iv) oxide
The molar mass of carbon (iv) oxide is 44 g/mol
Thus, we have the mass as:
[tex]\frac{312}{44}\times44\text{ = 312 g}[/tex]