Physical properties & changes

1. A student measured the density of gold and found it to be 20.5 g/cm³. Then she looked up the accepted value to be 19.3 g/cm³. Calculate the percent deviation.

• 19.5%

• 62%

• 6.2%

• 195%

A sphere was dropped into water in a graduated cylinder as shown. What is the volume of the sphere?

• 15 mL

• 25 mL

• 40 mL

• 65 mL

Gallium is a metal that melts in water. A student measures the mass of a sample to be 60 grams. What is its volume approximately

• 11.8 cm³

• 306 cm³

• 51 cm³

• 5.1 cm³

A sample of aluminum weighs 10 grams. What is its volume?

• 2.7 cm³

• 270 cm³

• 3.7 cm³

• 10 cm³

At STP, a 50.-gram sample of H₂O_(l) and a 100.-gram sample of H₂O_(l) have

• the same chemical properties

• the same volume

• different temperatures

• different empirical formulas

Which particle diagram represents a sample of oxygen gas at STP?

• 1

• 2

• 3

• 4

Which phase change below represents deposition?

• I₂(g) → I₂(s)

• Br₂(g) → Br₂(s)

• H₂O(l) → H2O(s)

• CH₄(g) → CH₄(l)

The hottest temperature ever recorded 56 Celsius. What is that in Kelvin?

• 329

• 217

• 56

• 273

Which of the nonmetals below will be a solid at STP?

• Bromine

• Iodine

• Chlorine

• xenon

Which of the following equations represents a physical change?

• CH_{4 (g)} + O₂ (g)--> H₂O (l) + CO₂(g)

• CO_{2 (g)} + Na⁺ _(aq) --> Na⁺ _(aq) + CO_{2 (g)}

• KNO₃ + NaCl --> KCl + NaNO₃

• HCl + Br₂ --> BrCl + H₂