Chemical equations and reactions

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

Tags

NGSS.MS-PS1-5

How many elements are in C₆H₁₂O₆?

• 6
• 12
• 3
• 24

The red numbers in the image below represent ________.

• subscripts
• coefficients
• I don't know.
• None of the answers are correct.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

The blue numbers in the image below represent ________.

• I don't know.
• coefficients
• subscripts
• None of the answers are correct.

Which are the reactants in the following reaction?
2Mg + O₂ ---> 2MgO 

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-2

In a chemical reaction, everything to the right of the arrow are called ______________.

• products
• yields
• molecules
• reactants

Tags

NGSS.HS-PS1-7

How many oxygens are in Al₂(SO₄)₃?

• 4
• 12
• 7
• 24

Tags

NGSS.MS-PS1-1

How many hydrogens are in 4H₂O?

• 6
• 8
• 2
• 4

Tags

NGSS.MS-PS1-1

Which of the following symbols is not a correct indication of the phase of a substance in a reaction? 

• (s)=solid
• (g)=grams
• (l)=liquid
• (aq)= aqueous

How many molecules of Carbon are in the following formula? 3C₂H₆

• 3
• 6
• 12
• 18

Tags

NGSS.MS-PS1-1