Matter (SOL Review from JLab)

Which of these is the best example of physical change?

• a match burning

• a cake baking

• a marshmallow roasting

• a candy bar melting

Which of these is a compound?

• oxygen in the air (O2)

• liquid nitrogen (N)

• neon in lights (Ne)

• carbon dioxide gas (CO2)

CH₄ + 2O₂ → CO₂ + 2H₂O

In this reaction, the products are

• CH₄ and 2O₂

• CH₄ and CO₂

• 2O₂ and 2H₂O

• CO₂ and 2H₂O

Which element is an alkali metal?

(***Use the image of the periodic table!)

• K

• Mg

• Al

• Ag

Gases are much more compressible than liquids. According to the particle model of matter, gasses are more easily compressed into smaller volumes because the particles in gases are -

• smaller

• more active

• farther apart

• filled with air

Compounds are made up of more than one element. Which of the following represents a compound?

• H₂

• NH₃

• O₃

• N₂

Which of these best shows that calcium is different from all other elements?

• Its positive electrical charge

• Its presence in milk

• Its number of protons

• Its ability to combine with oxygen

Which of the following elements has 16 protons?

• oxygen

• sulfer

• chlorine

• germanium

Which of these cannot be separated into its parts by an ordinary chemical or physical process?

• A mixture of salts (NaCl, KI)

• A compound of nitrogen (NH₃)

• An atom of carbon (C)

• An acid of chlorine (HCl)

In an experiment combining vinegar and baking soda, gas is given off. In this chemical reaction, the vinegar and baking soda are -

• reactants

• products

• elements

• suspensions