Honors Chemistry Final

0.095 cm is the same as

• 0.95 mm.

• 95 m.

• 0.095 m.

• 0.0095 mm.

Answer explanation

To convert cm to mm, multiply by 10. Thus, 0.095 cm x 10 = 0.95 mm. Therefore, 0.095 cm is the same as 0.95 mm, making it the correct choice.

What are the coefficients when the equation Fe₂O₃ + ___CO → ___Fe + ___CO₂ is correctly balanced?

• 0,2,2,3

• 1,2,2,2

• 1,3,2,3

• 2,6,4,3

Answer explanation

To balance the equation Fe₂O₃ + CO → Fe + CO₂, we need 1 Fe₂O₃, 3 CO, 2 Fe, and 3 CO₂. This gives the coefficients 1, 3, 2, 3, making the correct choice 1,3,2,3.

Tags

NGSS.HS-PS1-7

What is the formula for the compound formed by calcium ions and chloride ions?

• Ca₂Cl

• CaCl₂

• CaCl₃

• Ca₃Cl

Answer explanation

The formula for a compound is determined by the charges of the ions. Calcium (Ca) has a +2 charge and chloride (Cl) has a -1 charge. To balance the charges, two chloride ions are needed for each calcium ion, resulting in CaCl₂.

Tags

NGSS.MS-PS1-1

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

• 1.42 km

• 0.0825 km

• 30.7 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.

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

• L

• kg

• mg

• m

Answer explanation

The correct unit for measuring volume is liters (L). Other options like kg (kilograms) measure mass, mg (milligrams) also measure mass, and m (meters) measure length, not volume.

Which of the following particle drawings represent a pure substance?

• Option A

• Option B

• Option C

• Option D

Answer explanation

Option B represents a pure substance as it shows uniform particle arrangement, indicating that all particles are identical. In contrast, the other options display mixtures with different types of particles.

Tags

NGSS.MS-PS1-1

What is the formula for aluminum sulfate?

• AlSO₄

• Al₂(SO₄)₃

• Al₂SO₄

• Al(SO₄)₃

Answer explanation

The correct formula for aluminum sulfate is Al₂(SO₄)₃. This indicates that there are two aluminum (Al) ions and three sulfate (SO₄) ions in the compound, which is consistent with its chemical structure.

Name the compound Fe(NO₃)₂.

• iron (III) nitrate

• iron (II) nitrite

• iron (II) nitrate

• iron (III) nitrite

Answer explanation

Fe(NO₃)₂ contains iron with a +2 oxidation state, indicated by the (II) in the name. Therefore, it is correctly named iron (II) nitrate, distinguishing it from iron (III) nitrate, which would have a +3 oxidation state.

Tags

NGSS.HS-PS1-1

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

• 8.139 g/cm³

• 560. g/cm³

• 8.14 g/cm³

• 0.123 g/cm³

Answer explanation

Density is calculated by dividing mass by volume. Here, density = 67.55 g / 8.30 cm³ = 8.139 g/cm³. Thus, the correct answer is 8.139 g/cm³.

Using the heating curve above, determine the melting point for this substance.

• 120 °C

• 100 °C

• 80 °C

• 70 °C

Answer explanation

The melting point is identified at the temperature where the substance transitions from solid to liquid. In the heating curve, this occurs at 70 °C, making it the correct answer.

Tags

NGSS.HS-PS3-2