Type the correct answer in the box. Express your answer to two significant figures.
A reaction between 1.7 moles of zinc Ipdide and excess sodium carbonate ylelds 12.6 grams of zinc carbonate. This is the equation for the
reaction:
Na2CO3 + Zniz - 2Nal +
ZnCoz.
What is the percent yield of zinc carbonate?
The percent yield of zinc carbonate is
5.91
1X.

Answer:

Atoms form chemical bonds to make their outer electron shells more stable. An ionic bond, where one atom essentially donates an electron to another, forms when one atom becomes stable by losing its outer electrons and the other atoms become stable (usually by filling its valence shell) by gaining the electrons.

Answer:

true

Explanation:

Answer:

True.

Explanation:

It is true that energy cannot be made or lost, but it can move. For example, if you touch a metal pole and get a static shock, then the energy from the pole is being transferred to you. However, energy was not made or lost in the process. So, energy cannot be made or destroyed, but it can be moved. This also means there was the same amount of energy in the universe as there was millions of years ago. Hope this helps!

Answer:

d. oxygen (O2) is the answer

Answer:

https://download.cnet.com/1-Click-Answers/3000-2378_4-10060189.html

Explanation:

Answer:3

Explanation:

Answer:

B

Explanation:

B

Answer:

!dk bestie i tried to do it but i cant maybe someone else can figure it or they already did :( anyway i hope you have a amazing day luv <3

Answer:

0.324 mol

Explanation:

Mass of one mole or atomic mass of potassium is 39 g. Thus, number of moles in 12.65 g of potassium is 0.32 moles.

Atomic mass of an element is the mass of one mole of that element. One mole of an element contains 6.022 × 10²³ atoms. This  number is called Avogadro number.

Potassium is 19th element n periodic table. It is an alkali metal in the first group. The atomic mass of potassium is 39 g/mol. This is the mass of one mole of potassium. The chemical symbol of potassium is K.

Given  mass of potassium = 12.65 g

atomic mass = 39 g/mol

number of moles in 12.65 g = mass/ atomic mass

no.of moles  = 12.65 /39 = 0.32 moles.

Therefore, the number of moles of 12.65 g of potassium is 0.32 moles.

Find more on atomic mass:

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#SPJ2

Wolves are a censerious(critical) keystone species in a healthy ecosystem. By regulating prey populations, wolves authorize(enable) many other species of plants and animals to flourish. Without predators, such as wolves, the system fails to support a natural level of biodiversity.

Answer: I believe it would be B. Genus

Explanation:

I looked up the definitions for you and genus is defined as the group above species. Picture of definition attached.

Answer:

The coefficient of aluminum nitrate is 2.

Explanation:

The reaction between aluminum nitrate and calcium phosphite is:

Al(NO₃)₃ + CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂  

Now, we need to balance the equation. Let's begin with phosphite anion. On the reactant side we have 1 molecule of the anion, and on the products side we have 3 of it, so we need to add a coefficient of 3 before CaHPO₃:

Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂

The number of Ca atoms on the reactants side is now 3 and on the products side is 1, so we need to add a coefficient of 3 as follows:

Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂  

The reactants side has 1 atom of Al, and the products side has 2. Let's add a coefficient of 2 on the reactant side:

2Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂  

Finally, the nitrate anion has 6 molecules on the reactant side, which is equal to the number of molecules of NO₃⁻ on the product side.

Hence, in the balanced equation, we have a coefficient of 2 in aluminum nitrate.

I hope it helps you!

Answer:

4

Explanation:

at room temperature and standard pressure methane is a colourless gas. Methane consist of one carbon atom bonded to 4 hydrogen atom and it also forms the major percentage of natural gas

Regarding methane, it is true that:

Let's consider which of the following is true concerning methane?

1) It is a gas at standard temperature and pressure. TRUE. Like most small hydrocarbons, methane is a gas at STP.

2) It consists of one carbon atom and four hydrogen atoms. TRUE. The chemical formula of methane is CH₄.

3) It is the major component of natural gas. TRUE. It represents about 95 mole % of natural gas.

4) All of the above. TRUE.

Regarding methane, it is true that:

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Answer: 1. 20.0 grams

2. 0.272 moles

3. B) Mass --> Moles --> Volume

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text{Avogadros number}}[/tex] or

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] or  

Putting in the values we get:

1. [tex]\text{Number of moles of} Cl_2=\frac{1.7\times 10^{23}}{6.023\times 10^{23}}=0.282moles[/tex]

Mass of [tex]Cl_2=moles\times {\text {Molar mass}}=0.282mol\times 71g/mol=20.0g[/tex]

2. [tex]\text{Number of moles of NaCl}=\frac{3.28\times 10^{23}}{2\times 6.023\times 10^{23}}=0.272moles[/tex]

3. [tex]\text{Number of moles of water}=\frac{26g}{18g/mol}=1.44moles[/tex]

Volume of water =[tex]moles\times {\text {Molar volume}}=1.44mol\times 22.4L/mol=32.4L[/tex]

Answer:

what is this pdf I cannot see your question

Answer:

D

Explanation:

Answer:

Solvation

Explanation:

Solvation is the name of the process in which the particles of the solute are surrounded by the particles of the solvent molecules and they together mix together to form a solution.

In order words, it is a process of the surrounding solute particles with the solvent particles in order to form a solutions. When the water is the solvent, the process is known as hydration.  

It only occurs when the particles of the solvent and solute are in contact with each other and the opportunity for the dissolving process is more when more is the contact between the particles.

Answer:

friction

Explanation:

jwjwkkskskaksksk

Answer:

true

Explanation:

Answer: 1

Explanation:

DNA never leaves the nucleus

Answer:

1. DNA can leave the nucleus, RNA can't is the answer.

Explanation:

If a certain material is not permitted by these receptors to leave or enter the nucleus, it can’t. DNA is not among the materials that have the permission to leave and enter the nucleus. RNA, on the other hand, can leave and enter the nucleus to perform its functions, but this leaving and entering movements don’t occur without regulation.

Answer:

Well, he needs to take one more electron to have a stable structure. And by doing that the atom will have more electrons than protons and will turn into a negative ion.

Answer:

9.8g

Explanation:

Using periodic table find molar mass of C and H:

C=12.01g/mol

H=1.008g/mol

Molar mass of C2H4=(12.01)2+(1.008)4=28.03g/mol

Using molar mass times moles of the chemical to find the mass in 0.35 moles of c2h4:

28.03 x 0.35=9.8grams

Answer:

The value of the equilibrium constant Kc is 5.45

Explanation:

The "Law of Mass Action" states:

"For a reversible reaction in chemical equilibrium at a given temperature, it is true that the product of the concentrations of the products raised to the stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients is a constant."

This constant was called the equilibrium constant. For a reaction:

aA + bB ⇄ cC + dD

the equilibrium constant Kc is:

[tex]Kc=\frac{[C]^{c} *[D]^{d} }{[A]^{a} *[B]^{b} }[/tex]

In this case, the balanced reaction is:

2 H₂S → 2 H₂ + S₂

So, the equilibrium constant Kc is:

[tex]Kc=\frac{[H_{2} ]^{2} *[S_{2} ] }{[H_{2} S]^{2} }[/tex]

The equilibrium concentrations are

Replacing in the definition of equilibrium constant:

[tex]Kc=\frac{(0.88 M)^{2} *0.44 M }{(0.25 M)^{2} }[/tex]

Solving:

Kc= 5.45

The value of the equilibrium constant Kc is 5.45

Answer:

It hurts more because of the greater mass of the bowling ball.

Explanation:

Gravity exerts a greater force on the bowling ball because of its mass, pushing it harder into your leg while it's rolling over it.