Matter Interacting Part 2 Review

Fill in the blank:
The law of conservation of mass states that matter cannot be created nor __________________.

• destroyed
• rearranged
• transferred
• changed

In a closed system, a chemical reaction takes place.  The mass of the reactants in the beginning of the reaction is 25g.  What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

• 25g
• You can't tell with the given information.
• 30g
• 15g

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

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 loose mass after the reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In this chemical equation , CH₄ and 2O₂ are called the...

• Products

• Reactants

• Coefficient

• Subscript

In this chemical equation , CO₂ and 2H₂O are called the...

• Products

• Reactants

• Coefficient

• Subscript

There are 4 hydrogens in the products of the equation. How many hydrogens would you expect in the reactants?

• 1

• 3

• 4

• 5

What are the REACTANTS :

H₂O + CO₂ → HCO + HO

• H₂O + CO₂

• HCO + HO

• H₂O ONLY

• HCO ONLY

Which compounds are the PRODUCTS of this reaction?

• CO₂ + H₂O

• C₆H₁₂O₆ + O₂

• C₆H₁₂O₆ + CO₂

• H₂O + O₂

Which are the reactants in the following reaction?

2Mg + O₂ ---> 2MgO

• 2MgO

• 2Mg +O

• 2Mg + O₂