Chemistry Exp. 1/ Investigation #1

You leave each of the following items outside on a hot, sunny day. Once the sun goes down, which item will cool off the fastest?

• Aluminum baseball bat

• Gold bracelet

• Wood bench

• Copper penny

You have four water samples at different temperatures. In which sample are the molecules vibrating at the fastest speed?

• Water at 37 ^oC

• Water at 99 ^oC

• Water at 99 ^oF

• Water at 299 K

While burning coal and charcoal, you notice that coal releases more heat than charcoal. That means that the chemical potential energy is ________________ in charcoal than in coal.

• Lower

• Higher

• The same

In a chemistry experiment, the total energy contained in a system is 45 J. After the system undergoes a chemical reaction, the total energy in the system is 39 J. Which of the following statements is true?

• The surroundings lost 6 J

• The surroundings gained 6 J

• The surroundings did not lose or gain energy

• This is impossible as a system cannot lose energy

According to the law of conservation of mass, mass is __________________. Select ALL that apply.

• Conserved during chemical reactions

• Always conserved over time

• Conserved during physical transformations

• Never conserved

When you touch an ice cube, heat is transferred from________ to________

Calculate the density of an object with a mass of 5 g and a volume of 12 mL. Would it sink or float in water? (The density of water is 1 g/mL).  IN THE SPACE PROVIDED, SHOW HOW YOU CALCULATED YOUR ANSWER & WHETHER THE OBJECT WILL SINK OR FLOAT IN WATER.