Matter quiz

The substances listed on the left side of a chemical equation are the 

• products

• catalysts

• solvents

• reactants

Answer explanation

In a chemical equation, the substances on the left side are called reactants. They undergo a chemical change to form products, which are listed on the right side.

In chemical reactions, what does the principle of conservation of mass/matter mean? 

• Mass can be created or destroyed in chemical reactions.

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

• In chemical reactions, the total mass of reactants equals the total mass of products.

• The total mass of reactants is irrelevant to the products formed.

Answer explanation

The principle of conservation of mass states that in chemical reactions, the total mass of reactants equals the total mass of products, meaning mass is neither created nor destroyed.

Tags

NGSS.MS-PS1-5

How many Hydrogens (H) atoms are in NH₃O₅ 

• 4

• 3

• 2

• 5

Answer explanation

In NH3O5, the formula indicates there are 3 hydrogen (H) atoms. The 'NH3' part shows 3 H atoms, while 'O5' refers to oxygen and does not contribute any H atoms. Therefore, the correct answer is 3.

Tags

NGSS.MS-PS1-1

Name the part in red: H₂ + O₂ -> H₂O 

• subscripts

• coefficients

• exponents

Answer explanation

The part in red, '2', represents subscripts in the chemical formula. Subscripts indicate the number of atoms of each element in a molecule, such as in H2O, where '2' shows there are two hydrogen atoms.

Name the part in red: 2H₂ + 1O₂ -> 2H₂O 

• coefficients

• subscripts

• exponents

Answer explanation

The part in red represents coefficients, which indicate the number of molecules involved in the reaction. In this case, '2' before H2 and '1' before O2 show the ratio of reactants to products.

Name the part in red: H2 + O2 -> H2O 

• products

• reactants

Answer explanation

In the reaction H2 + O2 -> H2O, the substances on the right side of the equation (H2O) are the products, as they are formed from the reactants (H2 and O2) on the left side. Therefore, the part in red is correctly identified as products.

Tags

NGSS.MS-PS1-2

Name the part in red: H2 + O2 -> H2O 

• products

• reactants

Answer explanation

In the reaction H2 + O2 -> H2O, the substances on the left side (H2 and O2) are called reactants, as they undergo a chemical change to form the product, H2O, on the right side.

Tags

NGSS.MS-PS1-2

How many phosphorus atoms are in PO₄

• 1

• 4

• 3

• 2

Answer explanation

In the chemical formula PO4, 'P' represents phosphorus. There is only one phosphorus atom in this formula, making the correct answer 1.

Tags

NGSS.MS-PS1-1

How many hydrogens are in 4H₂O

• 8

• 4

• 10

• 6

Answer explanation

In 4H₂O, each water molecule (H₂O) contains 2 hydrogen atoms. Therefore, 4H₂O has 4 x 2 = 8 hydrogen atoms. Thus, the correct answer is 8.

Tags

NGSS.MS-PS1-1

Read the following chemical formula: C₆H₁₂O₆. How many hydrogens atoms are in the formula?

• 6

• 18

• 24

• 12

Answer explanation

In the formula C6H12O6, the subscript '12' next to H indicates there are 12 hydrogen atoms. Therefore, the correct answer is 12.

Tags

NGSS.MS-PS1-1