Chemistry

Which of the following is an example of a compound?

• copper

• iron

• carbon

• water

Which substance is composed of only one type of atom?

• water

• gold

• salt

• sugar

What is the smallest unit of an element that still retains the element’s properties?

• a proton

• a crystal

• an atom

• a molecule

Which type of matter can be separated by physical means?

• atom

• element

• compound

• mixture

Which of these is a physical change that takes place in a garden?

• Insects eat the leaves of a plant for food.

• Flowers grow after a summer rain shower.

• Earthworms loosen soil as they travel through it.

• Leaves convert sunlight to sugar by photosynthesis.

What number and types of atoms occur in a formula unit of $Ca\left(NO_3\right)_2$  

• 1 carbon atom, 1 neon atom, and 6 oxygen atoms

• 1 calcium atom, 2 neon atoms, and 3 oxygen atoms

• 1 carbon atom, 1 nitrogen atom, and 3 oxygen atoms

• 1 calcium atom, 2 nitrogen atoms, and 6 oxygen atoms

 How many atoms are in one formula unit of the compound  $FeC_5O_5$ ?

• 5

• 11

• 15

• 26

A student studies four chemicals in a laboratory investigation. Which chemical cannot be further broken down into other chemicals using ordinary laboratory processes?

• 1

• 2

• 3

• 4

 How many atoms of oxygen are in a molecule of glucose, $C_6H_{12}O_6$ ?

• 1

• 6

• 12

• 24

Which is a compound?

• Nitrogen $\left(N_2\right)$

• Neon (Ne)

• Ozone $\left(O_3\right)$

• Ammonia $\left(NH_3\right)$