Question 1

In the scientific method,a law carries more weight than a hypothesis.

Accepted Answer

A law in science is a generalized rule to explain a body of observations in the form of a verbal or mathematical statement, often considered to be universally true. A hypothesis, on the other hand, is a proposed explanation for a phenomenon which has not yet been rigorously tested. Therefore, a law carries more weight because it has been substantiated by extensive empirical evidence and testing, whereas a hypothesis is an initial, untested proposition.

Question 2

The number 0.0680 has 3 significant figures.

Accepted Answer

The digits 6, 8, and the trailing zero are significant because the zero is after a decimal point and after a non-zero digit.

Question 3

Energy may be defined as the heat content of an object.

Accepted Answer

Energy is the capacity to do work or produce change, and it can exist in various forms such as kinetic, potential, thermal, electrical, chemical, nuclear, or other forms, not just the heat content of an object.

Question 4

The area of a rectangle is determined by the formula: area = length × width.If a rectangle has a length of 32.6 cm and a width of 72.6 cm,what is the area of the rectangle to the correct number of significant figures?

Accepted Answer

The answer of The area of a rectangle is determined...

Question 5

Which statement is FALSE?

Accepted Answer

An extensive property depends on the amount of matter in a sample, such as mass and volume, while an intensive property does not depend on the amount of matter. Physical properties can be either extensive or intensive, so stating that an extensive property is synonymous with a physical property is incorrect.

Question 6

Equal masses of glass and steel at the same temperature will have different heat energies.

Accepted Answer

This is because the heat energy of a substance depends not only on its mass and temperature but also on its specific heat capacity, which varies from one material to another. Glass and steel have different specific heat capacities, so even at the same temperature and mass, their heat energies will differ.

Question 7

What volume,in milliliters,will 2.00 g of air occupy if the density is 1.29 g/L?

Accepted Answer

The answer of What volume,in milliliters,will 2.00 g of air...

Question 8

Mass is the force resulting from the pull of gravity upon an object.

Accepted Answer

Mass is a measure of the amount of matter in an object, not a force. The force resulting from the pull of gravity on an object is called weight.

Question 9

Which of the following numbers has only one significant figure?

Accepted Answer

0.003 has only one significant figure. The leading zeros are not counted as significant figures, leaving only the '3' as significant.

Question 10

The terms mass and weight are identical.

Accepted Answer

Mass is a measure of the amount of matter in an object, typically measured in kilograms or grams, while weight is the force exerted by gravity on that mass, typically measured in newtons or pounds.

Question 11

Concentration is a measure of the number or mass of particles of a substance that are contained in a specified volume.

Accepted Answer

Concentration quantifies the amount of a substance (in terms of number or mass) per unit volume, indicating how much of the substance is present in a given volume of solution or mixture.

Question 12

NaCl is best classified as a/an

Accepted Answer

NaCl (sodium chloride) is a compound because it is made of more than one kind of element chemically combined in a fixed ratio. It is also a pure substance because it has a definite composition and properties.

Question 13

Give the answer to the following calculation to the correct number of significant figures. (5.0 × 10^-4)- (6 × 10^-5)= ?

Accepted Answer

The calculation simplifies to $5.0 \times 10^{-4} - 6 \times 10^{-5}$. Converting the second term to $0.6 \times 10^{-4}$ for subtraction gives $4.4 \times 10^{-4}$, maintaining the correct number of significant figures from the original numbers.

Question 14

Tire pressure in the U.S.is measured in lb/in². Convert 25 lb/in² to g/cm².454 g = 1 lb,2.54 cm = 1 in

Accepted Answer

To convert 25 lb/in^2 to g/cm^2, first convert pounds to grams (25 lb * 454 g/lb = 11350 g) and inches to centimeters squared (1 in^2 = (2.54 cm)^2 = 6.4516 cm^2). Then, divide the total grams by the total square centimeters (11350 g / 6.4516 cm^2 ≈ 1760 g/cm^2), which is 1.76 × 10^3 g/cm^2 or 1.8 × 10^3 g/cm^2 when rounded to one significant figure as in the options.

Question 15

How many cm are in 3.5 × 10^-2 km?

Accepted Answer

The answer of How many cm are in 3.5 ×...

Question 16

The presence of some error is a natural consequence of any measurement.

Accepted Answer

All measurements have some degree of uncertainty or error due to limitations in measurement techniques, instruments, and even the object being measured.

Question 17

One calorie is the amount of energy needed to raise the temperature of one gram of water one degree Celsius.

Accepted Answer

One calorie is defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius at a pressure of one atmosphere.

Question 18

Consider the following set of numbers.If the true value is 12.6 cm²,which of the following best describes the set of numbers? 12.6 cm²,12.5 cm²,12.6 cm²

Accepted Answer

The set of numbers includes the true value (12.6 cm), indicating accuracy, and the repeated value (12.6 cm) indicates precision, as the measurements are close to each other.

Question 19

Hypotheses are not acceptable in the scientific method.

Accepted Answer

Hypotheses are a fundamental part of the scientific method, serving as testable predictions or explanations that guide experimentation and research.

Question 20

Each piece of data is the individual result of a single measurement.

Accepted Answer

Each piece of data represents the outcome of one observation or measurement, capturing a single point of information within a larger dataset.

Quiz 1: Chemistry - Methods and Measurement

In the scientific method,a law carries more weight than a hypothesis.

The number 0.0680 has 3 significant figures.

Energy may be defined as the heat content of an object.

The area of a rectangle is determined by the formula: area = length × width.If a rectangle has a length of 32.6 cm and a width of 72.6 cm,what is the area of the rectangle to the correct number of significant figures?

Which statement is FALSE?

Equal masses of glass and steel at the same temperature will have different heat energies.

What volume,in milliliters,will 2.00 g of air occupy if the density is 1.29 g/L?

Mass is the force resulting from the pull of gravity upon an object.

Which of the following numbers has only one significant figure?

The terms mass and weight are identical.

Concentration is a measure of the number or mass of particles of a substance that are contained in a specified volume.

NaCl is best classified as a/an

Give the answer to the following calculation to the correct number of significant figures. (5.0 × 10^-4) - (6 × 10^-5) = ?

Tire pressure in the U.S.is measured in lb/in². Convert 25 lb/in² to g/cm².454 g = 1 lb,2.54 cm = 1 in

How many cm are in 3.5 × 10^-2 km?

The presence of some error is a natural consequence of any measurement.

One calorie is the amount of energy needed to raise the temperature of one gram of water one degree Celsius.

Consider the following set of numbers.If the true value is 12.6 cm²,which of the following best describes the set of numbers? 12.6 cm²,12.5 cm²,12.6 cm²

Hypotheses are not acceptable in the scientific method.

Each piece of data is the individual result of a single measurement.

Quiz 1: Chemistry - Methods and Measurement

In the scientific method,a law carries more weight than a hypothesis.

The number 0.0680 has 3 significant figures.

Energy may be defined as the heat content of an object.

The area of a rectangle is determined by the formula: area = length × width.If a rectangle has a length of 32.6 cm and a width of 72.6 cm,what is the area of the rectangle to the correct number of significant figures?

Which statement is FALSE?

Equal masses of glass and steel at the same temperature will have different heat energies.

What volume,in milliliters,will 2.00 g of air occupy if the density is 1.29 g/L?

Mass is the force resulting from the pull of gravity upon an object.

Which of the following numbers has only one significant figure?

The terms mass and weight are identical.

Concentration is a measure of the number or mass of particles of a substance that are contained in a specified volume.

NaCl is best classified as a/an

Give the answer to the following calculation to the correct number of significant figures. (5.0 × 10-4) - (6 × 10-5) = ?

Tire pressure in the U.S.is measured in lb/in2. Convert 25 lb/in2 to g/cm2.454 g = 1 lb,2.54 cm = 1 in

How many cm are in 3.5 × 10-2 km?

The presence of some error is a natural consequence of any measurement.

One calorie is the amount of energy needed to raise the temperature of one gram of water one degree Celsius.

Consider the following set of numbers.If the true value is 12.6 cm2,which of the following best describes the set of numbers? 12.6 cm2,12.5 cm2,12.6 cm2

Hypotheses are not acceptable in the scientific method.

Each piece of data is the individual result of a single measurement.

Give the answer to the following calculation to the correct number of significant figures. (5.0 × 10^-4) - (6 × 10^-5) = ?

Tire pressure in the U.S.is measured in lb/in². Convert 25 lb/in² to g/cm².454 g = 1 lb,2.54 cm = 1 in

How many cm are in 3.5 × 10^-2 km?

Consider the following set of numbers.If the true value is 12.6 cm²,which of the following best describes the set of numbers? 12.6 cm²,12.5 cm²,12.6 cm²