VHCC Chemistry Chapter 1 Quizizz

. What is a scientific theory?

• It is a collection of experimental data.

• It is an explanation of natural phenomena that has undergone significant testing.

• It is a guess or conjecture about natural phenomena.

• It is a fundamental relationship of nature

A saline solution similar to that used for intravenous drips is made by dissolving 0.45 g sodium chloride in 50.00 g water. Which of the following statements concerning the saline solution and the law of conservation of mass is/are correct?

1. The mass of the saline solution is greater than the mass of water.

2. The mass of the saline solution is equal to the combined mass of sodium chloride and water.

3 The mass of the saline solution is greater than the mass of the sodium chloride.

• 1 only

• 1, 2, 3

• 2 only

• 1 and 2

The state of matter for an object that has both definite volume and definite shape is the

• solid

• liquid

• gas

• elemental

Which of the following is a mixture?

• a homogeneous solution of sugar dissolved in water

• bromine

• sucrose (table sugar)

• calcium oxide

Which of the following statements is not correct?

• The combustion of methane (a component of natural gas) is a chemical change.

• The melting of ice isa physical change.

• The dissolution of sugar in water is a chemical change

• The decomposition of sugar into carbon and water when mixed with sulfuric acid is a chemical change

Which of the following is a chemical property of copper?

• It is easily malleable

• It dissolves in certain acids

• It conducts electricity

• It metls at 1085 degrees celsuis

The term that is related to the reproducibility (repeatability) of a measurement is

• accuracy

• precision

• qualitative

• extensive

Which of the following statements concerning accuracy and precision is/are correct?

1. It is possible for a series of measurements to be both precise and inaccurate.

2.Accuracy is a measure of how close multiple measurements are to each other.

3. The more significant figures in a measurement the more accurate the measurement.

• 1 and 2

• 1 only

• 3 only

• 2 and 3

How many significant figures are there in the number 8.100?

• 5

• 4

• 2

• 1

Express the result of the following calculation in scientific notation: 503 cm × 355 cm

• 17.9x10⁴ cm²

• 1.8x10⁵ cm²

• 1.79x10⁵ cm²

• 178565 cm²