Exam 1 Review

__________ has a definite shape and a definite volume. 

• Solid
• Liquid
• Gas
• None of the above

The weight of a white rectangular chair is the same on Earth as it is on the moon.

• True
• False

Which of the following is NOT a physical property?

• Conductivity
• Solubility
• Density
• Flammability

During photosynthesis, sugar C₆H₁₂O₆ is produced from carbon dioxide, water, and sunlight. Which statement BEST explains what happens during photosynthesis?

• Atoms are gained when sugar is formed.
• Single atoms are converted into molecules.
• Atoms from compounds are lost when sugar is formed.
• Atoms of compounds are rearranged to form new compounds. 

What is the density of a cube with a volume of 2 cm³ and a mass of 8 grams?

• 1/4 cm³/g
• 1/4 g/cm³
• 4 g/cm³
• 1/4 cm³/g

We can see water change state, from ice to steam. This is a _______ change in matter. 

• Chemical
• Combustion
• Physical
• Solubility

When an athlete gets hurt they apply sometimes an instant cold pack to the the injury. The instant cold pack works by mixing two chemicals that create a chemical reaction. What evidence is there that a chemical reaction is taking place in the cold pack? 

• Change in odor
• Change in color
• Formation of gas
• Temperature change

Which of these is an example of a physical change?

• Iron melting
• Steel rusting
• Paper burning
• Wood decaying

Most metals are solid at room temperature, malleable, ductile, good conductors of heat and electricity, and react in acids to produce hydrogen gas. Which of the properties mentioned is a chemical property? 

• Are malleable
• React with acids
• Solid at room temperature
• Are good conductors of heat

Elaborate on the difference between a chemical change and a physical change.

• A physical change is irreversible where as a chemical change is reversible.
• A physical change does not form new substances and a chemical change does not break any bonds. 
• A physical change rearranges atoms but a chemical change causes a substance to remain the same. 
• A physical change does not break any bonds while a chemical change does form new substances.