Which of the following is true about an atom of iron and an atom of copper?

1 They have different masses.

2 Both have the same properties.

3 They have an equal number of protons.

4 Both have different types of sub-atomic particles.

Write a net ionic equation for the overall reaction that occurs when aqueous solutions of phosphoric acid (h3po4) and potassium hydroxide are combined. assume excess base. use the pull-down boxes to specify states such as (aq) or (s).

Why the standard enthalpy change of hydration of copper sulphate cannot be measured directly?

Identify the number of significant figures in each value. 147,320 g

Which of the following must be true about a reaction if it is only spontaneous at high temperatures? A) it is exothermic, with both negative enthalpy and entropy changes. B) It is endothermic, with both positive enthalpy and entropy changes.

Scientists noticed that the ozone layer was thinning. What was occurring at the same time?

How many atoms are there in one molecule of hexane? (a) six (b) ten (c) twelve (d) twenty

3) A neutral solution has a pH of This means the amount of H + ions is (equal to/less than/greater than) the amount of OH- ions. * 7; greater than 14; equal to 1; less than 7; equal to 0; equal to

Ion Formed of Cl, Te

What does the law of conservation of energy state about energy in a closed system? Energy cannot be created or destroyed. Energy can be created but not destroyed. O Energy can be destroyed but not created. O Energy can be either troyed or created.

A measure of the internal energy that has been absorbed or transferred from one body to another is