8.6B, 7.6B, 8.6E, 6.7B, & 8.7A Quiz

A chemist analyzes the reaction: 2H₂ + O₂ → 2H₂O. How many total oxygen atoms are present on each side (not both sides) of the equation?

• 1

• 2

• 4

• 6

Tags

NGSS.MS-PS1-5

Which of the following best describes the role of the periodic table in identifying atoms in a reaction?

• It shows which elements will react together.

• It provides the atomic number and symbol for each element.

• It explains the speed of chemical reactions.

• It lists only elements that can form compounds.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The formula Fe₂O₃ represents a compound containing:

• 1 iron atom and 3 oxygen atoms

• 2 iron atoms and 3 oxygen atoms

• 2 iron atoms and 6 oxygen atoms

• 3 iron atoms and 2 oxygen atoms

Tags

NGSS.MS-PS1-1

How many total atoms are in one molecule of C₂H₆O?

• 6

• 7

• 9

• 10

Tags

NGSS.MS-PS1-1

Which of the following compounds contains the most oxygen atoms?

• CO₂

• H₂O₂

• C₆H₁₂O₆

• MgO

Tags

NGSS.MS-PS1-1

What is the total number of atoms in Al₂(SO₄)₃?

• 9

• 12

• 17

• 18

Tags

NGSS.MS-PS1-1

Which of the following correctly explains why mass is conserved in a chemical reaction?

• Atoms are rearranged, but none are lost or gained.

• The mass of reactants is always less than the products.

• Energy is destroyed to create new substances.

• Mass is lost when compounds form.

Tags

NGSS.MS-PS1-5

In the reaction 2Mg + O₂ → 2MgO, what is the mass of the products if the reactants have a total mass of 48 grams?

• 24 grams

• 48 grams

• 96 grams

• Cannot be determined

Tags

NGSS.MS-PS1-5

A student burns a piece of wood, causing it to release gases and leave behind ash. The total mass of the system remains constant because:

• The gases have no mass.

• Matter is destroyed when burned.

• The mass of gases and ash equals the original mass of the wood.

• The wood loses mass as it burns.

Tags

NGSS.MS-PS1-5

A box is being pushed to the right with a force of 10 N, while friction pushes to the left with 4 N. What is the net force acting on the box?

• 6 N to the right

• 6 N to the left

• 10 N to the right

• 4 N to the left

Tags

NGSS.MS-PS2-2