Unit 3: Law of Conservation of Mass Test

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

• Destroyed a little bit

• frozen

• Transformed or changed

• evaporated

Tags

NGSS.MS-PS1-5

In a synthesis reaction

• A compound breaks apart into two or more compounds

• Two or more reactants make one larger product

• CO₂ and H₂O must be products

• O₂ must be a reactant

Tags

NGSS.MS-PS1-1

The coefficient in  3H₂O is

• 6
• 2
• 3
• 5

Tags

NGSS.MS-PS1-1

In a reaction A + B → C, reactant A weighs 5g and product C weighs 9g. How many grams does reactant B weigh?

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?

• They both will weigh the same

• The product always weighs more than the reactant

• The reactant will weigh more than the product

• They both will lose mass after the reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

P₄ + 3 O₂ ---> 2 P₂O₃

_{What type of chemical reaction is written above?}

• Single Replacement

• Combustion

• Synthesis

• Decomposition

Which are the reactants in the following reaction?

2Mg + O₂ → 2MgO

• Mg and O

• MgO

• Mg and MgO

• O and MgO

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which of the following chemical equations is balanced?

• 2Na + 4Cl → 3NaCl

• H₂ + O₂ → 2H₂O₄

• 4Al + 3O₂ → 2Al₂O₃

Tags

NGSS.MS-PS1-5

AB → A + B

In the reaction above, reactant AB has a mass of 12 grams and product B has a mass of 5 grams. How many grams should product A have?

• 17g

• 2g

• 7g

• 5 grams

Tags

NGSS.MS-PS1-5

Bob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?

• 200 g
• 700 g
• 1,100 g

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5