Chemical Reactions Quiz

Which statements of the following are true regarding the equation listed below? Fe + CuCl₂ → FeCl₂ + Cu Select TWO correct answers.

• The equation is balanced.

• The equation is not balanced.

• This is a synthesis reaction.

• This is a single-replacement reaction.

Answer explanation

The equation is not balanced because the number of atoms of each element is not equal on both sides. This is a single-replacement reaction where Fe replaces Cu in CuCl₂.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which reactant is needed to balance this equation and follow the law of conservation of mass? Move the correct answer to the box.

• 3 ag(NO₃)₃

• 2 Ag (NO₃)₄

• Fe₂Cl₂

• Fe₃NO₂

Answer explanation

To balance the equation, 2 Ag(NO₃)₄ is needed to follow the law of conservation of mass.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NH₃ + O₂ ↔ NO + H₂O Which of the following is the balanced form of the above unbalanced equation?

• 2NH₃ + 5O₂ ↔ 2NO + 3H₂O

• 2NH₃ + 3O₂ ↔ 2NO + 3H₂O

• 4NH₃ + 5O₂ ↔ 4NO + 6H₂O

• 4NH₃ + 3O₂ ↔ 4NO + 6H₂O

Answer explanation

The balanced form of the unbalanced equation NH₃ + O₂ ↔ NO + H₂O is 4NH₃ + 5O₂ ↔ 4NO + 6H₂O, which is the correct choice.

Tags

NGSS.MS-PS1-5

All of the following are reasons why equations are balanced EXCEPT To satisfy the law of conservation of mass To make sure matter is not created or destroyed To make the number of atoms of each element equivalent in both the reactants and products To obtain a zero net ionic charge

• True

• False

Answer explanation

Equations are balanced to satisfy the law of conservation of mass, ensure matter is not created or destroyed, and make the number of atoms of each element equivalent in both the reactants and products. Balancing equations does not aim to obtain a zero net ionic charge.

Tags

NGSS.MS-PS1-5

What are the respective coefficients needed to balance the equation below? __N₂ (g) + __H₂ (g) --> __NH₃ (g)

• 1, 1, 1

• 1, 2, 3

• 1, 3, 2

• 3, 3, 2

Answer explanation

To balance the equation, we need 1 N₂, 3 H₂, and 2 NH₃. Therefore, the respective coefficients are 1, 3, 2, which matches the correct answer choice.

Tags

NGSS.MS-PS1-5

A team of students uses a balance to find the mass of a large glass beaker. What is the mass of the beaker?

• 53.6 g

• 253.6 g

• 536 g

• 2,536 g

Answer explanation

The correct mass of the beaker is 253.6 g as determined by the team of students using a balance.

Using a balance, students found the mass of a plastic tray to be 9.6 grams. Then they poured iron filings onto the tray and returned it to the balance.

• 162.8 g

• 172.4 g

• 183.8 g

• 184.4 g

Answer explanation

The correct answer is 172.4 g because the total mass of the plastic tray and iron filings together is 172.4 g, as measured on the balance.

Tags

NGSS.MS-PS1-2

Which of the following is the best estimate of the volume poured from the graduated cylinder?

• 3.00 mL

• 3.60 mL

• 4.40 mL

• 4.60 mL

Answer explanation

The best estimate of the volume poured from the graduated cylinder is 3.60 mL, as it is the closest option to the actual volume.

A team of students collects a sample of rainwater in a graduated cylinder.

• 36.0

• 37.0

• 43.0

• 44.0

Answer explanation

The correct answer is 36.0 because it is the volume of rainwater collected in the graduated cylinder by the team of students.

A student uses a centimeter ruler to measure the length of the strip of litmus paper shown below.

• 3.5 cm

• 3.75 cm

• 4.25 cm

• 4.75 cm

Answer explanation

The length of the litmus paper strip is measured as 3.75 cm on the centimeter ruler used by the student, making it the correct choice.