CHEM 1306 Study Guide: Measurement, Matter, Energy, and Atomic Structure

Q1. The amount of space occupied by a substance is its ________.

Background

Topic: Basic Physical Properties

This question tests your understanding of fundamental physical properties and terminology in chemistry.

Key Terms:

• Mass: The amount of matter in an object.

• Density: Mass per unit volume.

• Volume: The amount of space an object occupies.

• Length: Measurement of distance.

• Weight: Force due to gravity acting on mass.

Step-by-Step Guidance

1. Review the definitions of each term listed in the answer choices.

2. Recall which term specifically refers to the amount of space an object or substance occupies.

3. Eliminate choices that refer to other properties (e.g., mass, length, weight).

Try solving on your own before revealing the answer!

Q2. Which of the following is a measurement of mass in the metric system?

Background

Topic: Metric System Units

This question tests your ability to identify metric units for mass.

Key Terms:

• Kilogram (kg): Standard metric unit for mass.

• Milliliter (mL): Unit for volume.

• Centimeter (cm): Unit for length.

• Degree Celsius (°C): Unit for temperature.

• Meter (m): Unit for length.

Step-by-Step Guidance

1. Review the metric system units and what physical quantity each measures.

2. Identify which unit is used for mass.

3. Eliminate units that measure volume, length, or temperature.

Try solving on your own before revealing the answer!

Q3. A value of 36 mL is a measure of ________.

Background

Topic: Units of Measurement

This question tests your ability to associate units with the correct physical property.

Key Terms:

• Milliliter (mL): Commonly used to measure volume.

Step-by-Step Guidance

1. Recall what physical property is measured in milliliters.

2. Review the answer choices and match the unit to the property.

Try solving on your own before revealing the answer!

Q4. A value of 26.4 mcg is a measure of ________.

Background

Topic: Units of Measurement

This question tests your ability to recognize metric units and their associated physical properties.

Key Terms:

• Microgram (mcg): A unit of mass in the metric system.

Step-by-Step Guidance

1. Recall what physical property is measured in micrograms.

2. Review the answer choices and match the unit to the property.

Try solving on your own before revealing the answer!

Q5. Which of the following measurements has two significant figures?

Background

Topic: Significant Figures

This question tests your ability to count significant figures in a measurement.

Key Terms:

• Significant figures: Digits in a measurement that are known with certainty plus one estimated digit.

Step-by-Step Guidance

1. Review the rules for determining significant figures (e.g., leading zeros are not significant, trailing zeros after a decimal are significant).

2. Count the significant figures in each measurement provided.

3. Identify which measurement has exactly two significant figures.

Try solving on your own before revealing the answer!

Q6. Which of the following numbers contains the designated correct number of significant figures?

Background

Topic: Significant Figures

This question tests your ability to match a number to its stated significant figures.

Key Terms:

• Significant figures: See previous definition.

Step-by-Step Guidance

1. For each option, count the significant figures in the number.

2. Compare your count to the number of significant figures stated in the option.

3. Identify which option matches the correct count.

Try solving on your own before revealing the answer!

Q7. Which of the following examples illustrates a number that is correctly rounded to three significant figures?

Background

Topic: Rounding and Significant Figures

This question tests your ability to round numbers to a specified number of significant figures.

Key Terms:

• Rounding: Adjusting a number to a specified number of significant digits.

Step-by-Step Guidance

1. Review the rules for rounding to significant figures.

2. For each example, check if the rounded number has three significant figures.

3. Identify which example is correctly rounded.

Try solving on your own before revealing the answer!

Q8. When 2610 + 11.7 + 0.22 are added, the answer to the correct number of decimal places is ________.

Background

Topic: Significant Figures in Addition

This question tests your ability to apply significant figure rules to addition.

Key Formula:

• When adding or subtracting, the result should have the same number of decimal places as the measurement with the fewest decimal places.

Step-by-Step Guidance

1. Identify the number of decimal places in each value.

2. Add the numbers together.

3. Round the result to match the measurement with the fewest decimal places.

Try solving on your own before revealing the answer!

Q9. What is the relationship between grams and micrograms?

Background

Topic: Metric Prefixes and Unit Conversion

This question tests your understanding of metric prefixes and how to convert between units.

Key Terms and Formula:

• 1 gram (g) = 1,000,000 micrograms (mcg)

• Conversion factor: $1\ \text{g} = 10^6\ \text{mcg}$

Step-by-Step Guidance

1. Recall the meaning of the prefix "micro-" (10-6).

2. Set up the conversion factor between grams and micrograms.

3. Express the relationship as a mathematical equation.

Try solving on your own before revealing the answer!

Q10. Which one of the following substances will float in gasoline, which has a density of 0.74 g/mL?

Background

Topic: Density and Buoyancy

This question tests your understanding of how density determines whether a substance will float or sink in another liquid.

Key Terms:

• Density: $\text{Density} = \frac{\text{mass}}{\text{volume}}$

• Buoyancy: A substance will float if its density is less than the liquid's density.

Step-by-Step Guidance

1. Compare the density of each substance to the density of gasoline (0.74 g/mL).

2. Identify which substance has a density less than 0.74 g/mL.

3. Recall that only substances with lower density than the liquid will float.

Try solving on your own before revealing the answer!

Q11. What is the mass of 2.00 L of an intravenous glucose solution with a density of 1.15 g/mL?

Background

Topic: Density Calculations

This question tests your ability to use density to calculate mass from volume.

Key Formula:

$\text{Density} = \frac{\text{mass}}{\text{volume}}$

Rearranged: $\text{mass} = \text{density} \times \text{volume}$

Step-by-Step Guidance

1. Convert the volume from liters to milliliters: $2.00\ \text{L} \times 1000\ \text{mL/L}$

2. Multiply the density (1.15 g/mL) by the volume in mL to find the mass in grams.

3. Convert the mass from grams to kilograms if needed.

Try solving on your own before revealing the answer!

Q12. What is the mass of 53 mL of ethanol, which has a density of 0.79 g/mL?

Background

Topic: Density Calculations

This question tests your ability to use density to calculate mass from volume.

Key Formula:

$\text{mass} = \text{density} \times \text{volume}$

Step-by-Step Guidance

1. Identify the given values: volume = 53 mL, density = 0.79 g/mL.

2. Multiply the density by the volume to find the mass in grams.

3. Check if the answer needs to be rounded to the correct number of significant figures.

Try solving on your own before revealing the answer!

Q13. The density of a solution is 1.18 g/mL. Its specific gravity is ________.

Background

Topic: Density and Specific Gravity

This question tests your understanding of the relationship between density and specific gravity.

Key Formula:

$\text{Specific gravity} = \frac{\text{density of substance}}{\text{density of water}}$

Density of water at 4°C = 1.00 g/mL

Step-by-Step Guidance

1. Recall the definition of specific gravity.

2. Divide the density of the solution by the density of water.

3. Express the result as a unitless number.

Try solving on your own before revealing the answer!

Q14. A piece of iron with a mass of 119 g is placed in a graduated cylinder, where the water level is 57 mL. The water level rises to 72 mL. What is the density of the iron?

Background

Topic: Density and Volume Displacement

This question tests your ability to calculate density using mass and volume displacement.

Key Formula:

$\text{Density} = \frac{\text{mass}}{\text{volume}}$

Step-by-Step Guidance

1. Calculate the volume of the iron by subtracting the initial water level from the final water level: $72\ \text{mL} - 57\ \text{mL}$

2. Use the mass of the iron (119 g) and the calculated volume to find the density.

3. Set up the density formula and plug in the values.

Try solving on your own before revealing the answer!

Q15. Which of the following is a characteristic of a gas?

Background

Topic: States of Matter

This question tests your understanding of the properties of gases compared to solids and liquids.

Key Terms:

• Gas: State of matter with no definite shape or volume; particles are far apart and move rapidly.

Step-by-Step Guidance

1. Review the properties of gases, solids, and liquids.

2. Identify which property is unique to gases among the choices.

Try solving on your own before revealing the answer!