Question 1

Assuming the density of water is 1.00 g/cm³, the mass of 1.0 cubic meter (m³) of water is _____ g.

Accepted Answer

The answer of Assuming the density of water is 1.00...

Question 2

The absolute zero point on the Kelvin scale is equal to _____.

Accepted Answer

The absolute zero point on the Kelvin scale, which is the point at which particles have minimum thermal motion, is equal to -273.15 °C.

Question 3

Significant figures allow us to estimate uncertainty in calculated values. In some circumstances, following significant figure rules can lead to estimates of uncertainty that are too high or low. This is the case for the mathematical expression below. 99 × 1.02 = 100.98 Following the rules governing significant figures in multiplication, the answer can be rounded to 1.0 × 10². What is wrong with rounding this answer to two significant figures?

Accepted Answer

The answer of Significant figures allow us to estimate uncertainty...

Question 4

A piece of metal (mass = 17.268 g) is placed in 10.50 mL of chloroform (d = 1.498 g/mL) in a 25-mL graduated cylinder. The chloroform level increases to 15.46 mL. The best value for density of this metal from these data is

Accepted Answer

To find the density of the metal, use the formula density = mass/volume. The volume of the metal is the change in chloroform level, which is 15.46 mL - 10.50 mL = 4.96 mL. The mass of the metal is given as 17.268 g. Therefore, the density of the metal is 17.268 g / 4.96 mL = 3.48 g/mL.

Question 5

Which response has the correct number of significant figures and units for the following mathematical operation? ? $9.23 \times 10 ^ { 5 } \mathrm { ergs } \times \frac { 1.000 \mathrm {~J} } { 1.000 \times 10 ^ { 7 } \mathrm { ergs } } \times \frac { 1.000 \mathrm { cal } } { 4.184 \mathrm {~J} } \times \frac { 1 \mathrm { kcal } } { 1000 \mathrm { cal } }$

Accepted Answer

The answer of Which response has the correct number of...

Question 6

​Express the number 0.000160 in scientific notation.

Accepted Answer

To express 0.000160 in scientific notation, we move the decimal point 4 places to the right, making it 1.6. To compensate for this shift, we multiply by 10 raised to the power of -4, resulting in 1.6 × 10^-4.

Question 7

As part of the calibration of a new laboratory balance, a solid with a mass of 0.200 g is taken as a standard and determined with the following results: Trial Mass
1 0.197 g
2 0.192 g
3 0.212 g
Average mass: 0.200 g

Accepted Answer

The average mass is accurate as it matches the standard mass of 0.200 g, but the individual measurements vary, indicating imprecision.

Question 8

The average speed of oxygen molecules at 570°C is 1.49 × 10⁵ cm/s. Which of the following calculations would convert this speed to units of miles per hour?

Accepted Answer

To convert cm/s to miles per hour, multiply by conversion factors: 1 inch/2.54 cm, 1 ft/12 inches, 1 mile/5280 ft, and 3600 s/1 hour.

Question 9

What is the difference between the accuracy of measurements and the precision of measurements?

Accepted Answer

The answer of What is the difference between the accuracy...

Question 10

A graph of number of marbles (y-axis) versus the weight of the marbles (x-axis, grams) is shown to be linear with a trendline of y = 2.7x. What is the weight of the marbles when the number of marbles is 11?

Accepted Answer

The answer of A graph of number of marbles (y-axis)...

Question 11

A graph of a certain set of data is shown to be linear with a trendline of y = 32.0x + 8. What is the sign and slope of the trendline obtained from this data?

Accepted Answer

The slope of the trendline is the coefficient of x in the equation of the trendline, which is 32.0 in this case. Since the equation of the trendline is y = 32.0x + 8, the intercept with the y-axis is positive (8), indicating that the trendline slopes upward. Therefore, the correct answer is A, positive and 32.0.

Question 12

The distance from Austin, Texas, to Lincoln, Nebraska, is 822 miles by car. Which of the following series of calculations will yield this distance in units of kilometers? (1 in = 2.54 cm (exact), 1 mi = 5280 ft (exact), 1 ft = 12 in (exact))

Accepted Answer

The correct conversion involves converting miles to feet, feet to inches, inches to centimeters, centimeters to meters, and finally meters to kilometers. Option D correctly follows these steps.

Question 13

Which of the following statements about dimensional analysis is true?

Accepted Answer

Dimensional analysis is a problem-solving approach that uses the dimensions or units of each value to guide us through calculations. This helps us to ensure that our final answer has the correct units and makes sense in the context of the problem. Conversion factors are often used in dimensional analysis to convert between different units, but they are not the only important aspect of the approach.

Quiz 2: Lets Review: the Tools of Quantitative Chemistry

Assuming the density of water is 1.00 g/cm³, the mass of 1.0 cubic meter (m³) of water is _____ g.

The absolute zero point on the Kelvin scale is equal to _____.

A piece of metal (mass = 17.268 g) is placed in 10.50 mL of chloroform (d = 1.498 g/mL) in a 25-mL graduated cylinder. The chloroform level increases to 15.46 mL. The best value for density of this metal from these data is

Express the number 0.000160 in scientific notation.

As part of the calibration of a new laboratory balance, a solid with a mass of 0.200 g is taken as a standard and determined with the following results: Trial Mass 1 0.197 g 2 0.192 g 3 0.212 g Average mass: 0.200 g

The average speed of oxygen molecules at 570°C is 1.49 × 10⁵ cm/s. Which of the following calculations would convert this speed to units of miles per hour?

What is the difference between the accuracy of measurements and the precision of measurements?

A graph of number of marbles (y-axis) versus the weight of the marbles (x-axis, grams) is shown to be linear with a trendline of y = 2.7x. What is the weight of the marbles when the number of marbles is 11?

A graph of a certain set of data is shown to be linear with a trendline of y = 32.0x + 8. What is the sign and slope of the trendline obtained from this data?

The distance from Austin, Texas, to Lincoln, Nebraska, is 822 miles by car. Which of the following series of calculations will yield this distance in units of kilometers? (1 in = 2.54 cm (exact) , 1 mi = 5280 ft (exact) , 1 ft = 12 in (exact) )

Which of the following statements about dimensional analysis is true?

Quiz 2: Lets Review: the Tools of Quantitative Chemistry

Assuming the density of water is 1.00 g/cm3, the mass of 1.0 cubic meter (m3) of water is _____ g.

The absolute zero point on the Kelvin scale is equal to _____.

A piece of metal (mass = 17.268 g) is placed in 10.50 mL of chloroform (d = 1.498 g/mL) in a 25-mL graduated cylinder. The chloroform level increases to 15.46 mL. The best value for density of this metal from these data is

​Express the number 0.000160 in scientific notation.

As part of the calibration of a new laboratory balance, a solid with a mass of 0.200 g is taken as a standard and determined with the following results: Trial Mass 1 0.197 g 2 0.192 g 3 0.212 g Average mass: 0.200 g

The average speed of oxygen molecules at 570°C is 1.49 × 105 cm/s. Which of the following calculations would convert this speed to units of miles per hour?

What is the difference between the accuracy of measurements and the precision of measurements?

A graph of number of marbles (y-axis) versus the weight of the marbles (x-axis, grams) is shown to be linear with a trendline of y = 2.7x. What is the weight of the marbles when the number of marbles is 11?

A graph of a certain set of data is shown to be linear with a trendline of y = 32.0x + 8. What is the sign and slope of the trendline obtained from this data?

The distance from Austin, Texas, to Lincoln, Nebraska, is 822 miles by car. Which of the following series of calculations will yield this distance in units of kilometers? (1 in = 2.54 cm (exact) , 1 mi = 5280 ft (exact) , 1 ft = 12 in (exact) )

Which of the following statements about dimensional analysis is true?

Assuming the density of water is 1.00 g/cm³, the mass of 1.0 cubic meter (m³) of water is _____ g.

Express the number 0.000160 in scientific notation.

The average speed of oxygen molecules at 570°C is 1.49 × 10⁵ cm/s. Which of the following calculations would convert this speed to units of miles per hour?