Ch. 7 part c

Question 1

The compound H2CO3 has _____ atoms of carbon in it.

a. one
b. two
c. zero
d. three

Answer 1

a. one

Question 2

you can determine the concentration of acids or bases in a solution by using ____.

a. a salt
b. the pH scale
c. the periodic table of elements
d. a particle accelerator

Answer 2

b. the pH scale

Question 3

A substance that changes color when exposed to acid or base solutions is called a(n) ____.

a. salt
b. ion
c. molecule
d. indicator

Answer 3

d. indicator

Question 4

if the element copper has 29 protons, how many electrons does it have? How do you know?

Answer 4

29 electrons,

I know, because it a normal atom there are the same number of electrons as protons.

Question 5

What are the two things you can tell about an element based on its location on the periodic table? ( hint: use the words periods and groups)

Answer 5

periods (the rows/ones that go across) tell how many shells of electrons the element has

groups (the columns/ones that go up and down) tell how many electrons are in the element’s outer shell.

elements in the same group have similar physical and chemical properties

Question 6

Explain why all compounds are molecules but not all molecules are compounds

Answer 6

compounds are only produced as a result of a chemical change or a chemical reaction. Which makes all compounds molecules.

molecules can be produced without a chemical change needed, but can also be produced with a chemical change too. so, not all molecules are compounds, but all compounds are molecules

Question 7

your litter sister was just bitten by a fire ant. you know that a fire ant’s bite is painful because of the acid it contains. what is something from your kitchen or bathroom that would help relieve the pain? why would it work?

Answer 7

Any base