Law of Conservation of Mass

In a synthesis reaction

• A compound breaks apart into two or more compounds
• Two compounds make one single product
• CO₂ and H₂O must be products
• O₂ must be a reactant

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

In a synthesis reaction

• A compound breaks apart into two or more compounds
• Two compounds make one single product
• CO₂ and H₂O must be products
• O₂ must be a reactant

The number of atoms of  N (nitrogen) in 3N₂O₅ is

• 2
• 5
• 6
• 15

Tags

NGSS.MS-PS1-1

The coefficient in  3H₂O is

• 6
• 2
• 3
• 5

Tags

NGSS.MS-PS1-1

A precipitate is a 

• liquid that forms when two solids are reacted
• a solid that forms when two liquids are mixed
• a gas that forms when vinegar and baking soda react
• a change of color in a solution

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a reaction A + B ----> AB,  reactant A has 4g and product  AB has 10g. How many grams does reactant B should have? 

• 4g
• 5g
• 6g
• 14g

Tags

NGSS.MS-PS1-5

A decomposition reaction has 

• only one reactant
• 2 reactants
• many reactants
• none of the above

The dissolving of ice tea powder in water is

• not a chemical reaction
• partly a chemical reaction
• it has reactants and products
• None of the above

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

If a reaction produces 18 grams, and one of its reactants had 10 grams, how much did the other reactant had?

• 28 grams
• 18 grams
• 10 grams
• 8 grams

Tags

NGSS.MS-PS1-5

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit
• Invisible
• Transformed, rearrenged
• None of the above

Tags

NGSS.MS-PS1-5