Midterm Review

0.095 cm is the same as

• 0.95 mm.

• 0.095 m.

• 95 m.

• 0.0095 mm.

Answer explanation

To convert cm to mm, multiply by 10. Thus, 0.095 cm = 0.095 x 10 = 0.95 mm. The correct answer is 0.95 mm.

5.600 L of water is equal to

• 560 mL.

• 0.00560 mL.

• 5600 mL.

• 5600. mL.

Answer explanation

5.600 L is equivalent to 5600 mL, as 1 L equals 1000 mL. Therefore, 5.600 L x 1000 mL/L = 5600 mL. The correct answer is 5600. mL.

Which of these metric units would you use to measure length?

• L

• mg

• kg

• m

Answer explanation

The correct unit for measuring length is 'm', which stands for meters. 'L' is for liters (volume), 'mg' is for milligrams (mass), and 'kg' is for kilograms (mass). Therefore, 'm' is the appropriate choice.

If 1 mile equals 1.61 km, how many kilometers are in 3570 yards? (1 mile = 1760 yards)

• 1.42 km

• 30.7 km

• 0.0825 km

• 3.27 km

Answer explanation

To convert 3570 yards to kilometers, first convert yards to miles: 3570 yards ÷ 1760 yards/mile = 2.025 miles. Then convert miles to kilometers: 2.025 miles × 1.61 km/mile = 3.27 km. Thus, the correct answer is 3.27 km.

How many significant figures are in the measured value of 0.0058350 kg?

• 5

• 4

• 3

• 2

Answer explanation

The measured value 0.0058350 kg has 5 significant figures. The leading zeros are not counted, but all non-zero digits and the trailing zero after the decimal point are significant.

Round the measurement 0.034770 m to two significant figures.

• 0.03m

• 3.4 x 10^2 m

• 0.035 m

• 0.0348 m

Answer explanation

To round 0.034770 m to two significant figures, we look at the first two non-zero digits, which are 3 and 4. The next digit is 7, which rounds the 4 up to 5, resulting in 0.035 m.

When 6.5 m is divided by 3 s, how should the answer be correctly recorded?

• 2.2 m/s

• 2 m/s

• 2.17 m/s

• 2.0 m/s

Answer explanation

When dividing 6.5 m by 3 s, the result is 2.1667 m/s. Rounding to two significant figures gives 2.0 m/s, which is the correct way to record the answer.

How is 0.0000860 cm written in scientific notation?

• 86 x 10^6 cm

• 8.6 x 10^-6 cm

• 8.6 x 10^5 cm

• 8.60 x 10^-5 cm

Answer explanation

To convert 0.0000860 cm to scientific notation, move the decimal point 6 places to the right, resulting in 8.6. Since the original number is less than 1, the exponent is negative: 8.6 x 10^-6 cm is correct.

What is the density of 67.55 g of material with a volume of 8.30 cm³?

• 8.136 g/cm³

• 8.14 g/cm³

• 560. g/cm³

• 0.123 g/cm³

Answer explanation

To find the density, use the formula: density = mass/volume. Here, density = 67.55 g / 8.30 cm^3 = 8.14 g/cm^3. Thus, the correct answer is 8.14 g/cm^3.

The nucleus of an atom has all of the following characteristics except that it

• is positively charged.

• is very dense.

• contains nearly all of the atom’s mass.

• contains nearly all of the atom’s volume.

Answer explanation

The nucleus is dense and contains most of the atom's mass, but it occupies a very small volume compared to the entire atom. Therefore, it does not contain nearly all of the atom's volume.

Tags

NGSS.HS-PS1-8