Chemistry EOC Review Part 1

What is the most appropriate tool for measuring 30.0 mL of a sodium chloride solution?

• the beaker because it is more stable and the liquid is less likely to spill

• the beaker because it is calibrated to hold large amounts of liquid

• the graduated cylinder because it is calibrated to measure the liquid more precisely

• the graduated cylinder because it will be nearly filled with liquid

Which set of tools will provide the most precise measurements for calculating the density of an irregularly shaped rock?

• flask and beaker

• flask and balance

• balance and graduated cylinder

• beaker and graduated cylinder

A student sets up an experiment to investigate the effect of temperature on the volume of 50 grams of gas inside a balloon. Which statement correctly describes the design of the experiment?

• The temperature is an experimental control, and the volume is the independent variable.

• The volume is an experimental control, and the temperature is the dependent variable.

• The mass of the gas is an experimental control, and the temperature is the independent variable.

• The temperature is an experimental control, and the mass of the gas is the dependent variable.

Scientists built a prototype of an electric device that may help predict human reactions to new medicines. Which next step should the scientists take to determine whether the device will be useful?

• test the device

• modify the device

• reevaluate the design of the device

• build the real device for application

Which of these is an example of a chemical change?

• Methane is burned in air

• A bar of copper is stretched into a long copper wire.

• Solid gold is melted to make jewelry.

• Iron is coated with bronze to prevent rusting.

What is the formula for calculating density?

• Mass ∗ Volume

• Volume ÷ Mass

• Mass ÷ Volume

• Volume ∗ Mass

Which statement is true?

• Oil is the most dense substance.

• Corn syrup is less dense than water.

• Oil and corn syrup have the same density but different masses.

• Oil is less dense than water.

A change that alters the appearance or form of a material but does not make the material into another substance

• Endothermic change

• Exothermic change

• chemical change

• physical change

n which state does matter completely fill its closed container?

• Gas

• Liquid

• Solid

• Ice

The volume of water in a beaker was 215 mL. After 5 days, the volume of the water was 200 mL. What best explains the change in volume?

• Some of the water absorbed the air.

• Some of the water evaporated and escaped into the air as water vapor.

• Some of the water disappeared.

• Some of the water was released due to condensation.