Which of the following is not a polyatomic ion? A) NO3- B) CaCO3
C) C2H3O2-
D) C6H5COO-

Answers

Answer 1

Answer: CaCO₃ is a compound in and of itself thus it is not a polyatomic ion.

Answer 2

Answer:

CaCO3 is your answer!

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The element oxidized in the reaction described in PbO2 + 4HCl → 2H2O + PbCl2 + Cl2 is A. Pb. B. O. C. H. D. Cl.

What type of chemical reaction is happening here? 8Fe + S8 --> 8FeS

Answers

This is a synthesis reaction since you are taking two elements and creating one (opposite of decomposition). I think this might also classify as a redox reaction as well since it appears as if iron is being oxidized and sulfur is being reduced (iron is loosing electrons while sulfur is gaining electrons).

I hope this helps. Let me know if anything is unclear.

Which is a diatomic molecule?
A. Ar
B. CO
C. CO2
D. NaCl

Answers

NaCI is the answer, in what my teacher taught me. Hope I helped :)

What mass of oxygen is required to completely react with 2 moles of ch4

Answers

The balanced reaction that describes the reaction between methane and oxygen to produce water and carbon dioxide is expressed CH4 + 2 O2 = CO2 +2H2O. Hence for 2 moles of methane used, 4 moles of oxygen are needed to react completely.

At the same temperature and pressure, 1.0 liter of CO(g) and 1.0 liter of CO2(g) haveA. equal masses and the same number of molecules
B. different masses and a different number of molecules
C. equal volumes and the same number of molecules
D. different volumes and a different number of molecules

Answers

Answer is C - equal volumes and the same number of molecules.

Explanation;

Let's assume that CO and CO₂ are ideal gases. Then we can use ideal gas law, PV = nRT

Where, P is the pressure of the gas (Pa), V is the volume of the gas (m³), n is the number of moles of gas (mol), R is the universal gas constant ( 8.314 J mol⁻¹ K⁻¹) and T is temperature in Kelvin.

The temperature and the pressure of the both gases are same. Volume is also same as 1.0 L. R is a constant. So according to the formula, both gases have same number of moles. According to the Avogadro's constant, 1 mole has 6.022 x 10²³ particles.

number of molecules = Avogadro's constant x number of moles.

Hence, under the same conditions both gases have same number of molecules.

C is the correct answer. All gases have the same volume under the same conditions.. This is just their nature. And one liter of a gas has the same number of molecules of another gas

Which subatomic particles each have a negative electrical charge?A) protons
B) neutrons
C) electrons

Answers

Answer: Option (C) is the correct answer.

Explanation:

Each element contains three sub-atomic particles which are protons, neutrons and electrons.

Inside the nucleus of an atom, there will be only protons and neutrons. Whereas electrons revolve around the nucleus of an atom.

Protons have a positive charge, neutrons have no charge and electrons have a negative charge.

Thus, we can conclude that electrons are the subatomic particles and each of them have a negative electrical charge.

C) electrons have a -ve charge.

A sample of Ca(OH)2 is considered to be an Arrhenius base because it dissolves in water to yieldA. Ca2+ ions as the only positive ions in solution
B. H3O+ ions as the only positive ions in solution
C. OH– ions as the only negative ions in solution
D. H– ions as the only negative ions in solution

Answers

Answer : The correct option is, (C) $OH^-$ ions as the only negative ions in solution

Explanation :

According to the Arrhenius concept, an acid is a substance that ionizes in the water to give hydronium ion or hydrogen ion $(H^+)$ and a bases is a substance that ionizes in the water to give hydroxide ion $(OH^-)$ .

A sample of $Ca(OH)_2$ is considered to be an Arrhenius base because when it dissolves in the water to yield $OH^-$ ions as the only negative ions in solution.