Question

Define kinetic energy. A) energy associated with the temperature of an object B) energy associated with the motion of an object C) energy associated with the force of an object D) energy associated with the gravity of an object E) energy associated with the position or composition of an object 2) Determine the density of an object that has a mass of 1498 g and displaces 12.1 mL of water when placed in a graduated cylinder. A) 8.08 g/mL B) 1.38 g/mL C) 12.4 g/mL D) 18.1 g/mL E) 11.4 g/mL 3) How many significant figures are in the measurement, 20.300 m?! A)3 B) 4 C) 5 D) 1 E)2 4) What does "X" represent in the following symbol? 80 358 A) mercury B) chlorine C) scandium D) bromine E) selenium 5) Write the formula for copper (II) sulfate pentahydrate. A) Cu2SO3 H5 B) Cu2S'H20 C) CuS 5H20 D) (CuSO4)5 E) CuSO4'5H20

Answer 1

1) B) Kinetic energy is energy associated with the motion of an object.

2) B) Density equals mass divided by volume: 1.38 g/mL

3) C) There are 5 significant figures in 20.300

4) A) 80 is the atomic number for mercury on the periodic table.

5) E) The formula for copper (II) sulfate pentahydrate is CuSO4•5H2O

So in summary:

• Kinetic energy is the energy of a moving object due to its motion.

• Density is calculated by dividing an object's mass by its volume.

• Significant figures refer to the known precision of a measurement based on the digits reported.

• Atomic symbols represent elements on the periodic table.

• Chemical formulas use symbols of the elements to show the proportions of atoms in a compound.

Answer 2

1. B, the energy associated with the motion of an object

2. C, 12.4 g/mL

3. C, 5