Which statement about a chemical reaction is true?

It occurs only at low temperatures.

It occurs only at high temperatures.

It occurs whenever a physical change takes place

It occurs whenever a chemical change takes place.

Ksp for calcium carbonate is 3 x 10-9. if you mix together 100 ml of 0.01 m calcium chloride with 100 ml of 10-5 m solution of potassium carbonate, will a precipitate form?

Which sequence is an example of radioactive decay?

Which of the following is an acceptable structure for 2,5,5-trimethylhept-3-yne (CH3CH2) CH (CH3) C≡CCH2CH (CH3) 2 CH3CH2C (CH3) 2C≡CC (CH3) 3 (CH3CH2) 2C (CH3) C≡CCH2CH3 (CH3CH2) C (CH3) 2C≡CCH (CH3) 2 (CH3CH2CH2) CH (CH3) C≡CC (CH3) 3

Is vapeing bad for you and explain y

An isotope of sulfur has an atomic mass or 32 amu. how many neutrons does it have?

How much greater is the energy produced by a fusion reaction compared to a chemical reaction?

True or false. A bond between a metal atom and a nonmetal atom is likely an iconic bond

What is a precipitate? It is a liquid that forms from solution during a chemical reaction. It is a reactant that forms from solution during a chemical reaction. It is a solid that forms from solution during a chemical reaction.

The electron configuration for an atom is 1s22s22p2. How many electrons does the atom have? 4 2 6 5

When a piece of sodium carbonate reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then the solution turns milky and a white precipitate Y is formed a. Write the chemical formula of X, Y and (3) b.