Law of Conservation of Matter Study guide

Ag2O  ---->  Ag + O. Identify what type of reaction this unbalanced equation is.

• Single replacement

• Double replacement

• Synthesis

• Decomposition

The substances undergoing reaction are called _________, and their formulas are placed on the left side of the equation.

• reactant

• product

• yield

• coefficent

Based on the Law of Conservation of Matter, predict the minimum amount of magnesium that will react with all 22.1 grams of oxygen to produce 40.3 grams of magnesium oxide. 

• 18.2

• 62.4

• 22.1

• 40.3

Tags

NGSS.HS-PS1-7

 K+ Cl2 ---> KCl .  Identify what type of reaction this unbalanced equation is. 

• Single replacement

• Double replacement

• Synthesis

• Decomposition

A burning candle is covered by a jar as shown in the picture. The whole arrangement has a mass of 500 g. What will be the approximate mass of the arrangement when the candle is completely burnt, after four minutes?

• 0g

• 250g

• 500g

• 1000g

Tags

NGSS.HS-PS1-7

 A lab group reacts Na2O with Hcl to produce Nacl and H2O. When writing their lab report, they came up with the following equation to represent the reaction:

Na2O + HCl → NaCl  +  H2O

Does this equation satisfy the Law of Conservation of Matter? Why or why not?

• Yes, since there are 5 reactant atoms and 5 product atoms

• Yes, since there is a subscript of 2 on both sides of the equation.

• No, since there are two sodium atoms as reactants, but only one sodium atom as a product.

• No, since there is a liquid and a solid as reactants, but a gas and a solid as a product

Tags

NGSS.HS-PS1-7

 A flask with vinegar in it has a mass of 160 grams. A balloon with baking soda in it has a mass of 40 grams. The balloon is attached to the flask to seal the opening and the vinegar and baking soda mixes. The balloon inflates to a large volume. What will the total mass of the balloon and flask be after the balloon inflates? Explain.

• Less than 200 grams because the solid baking soda disappears

• 200 grams, because all the atoms remain in the balloon or flask.

• More than 200 grams because the size of the balloon is so much larger 

Tags

NGSS.HS-PS1-7

The decomposition of dinitrogen tetroxide into nitrogen gas and oxygen gas is shown by which balanced equation?

• N2 + 2O2 → N2O4

• N2O4 → N2+ O2

• N2O4 → N2 + 2O2

• N2O4 + 2O2 → N2

SiCl4 + H2O --->  SiO2 +  HCl.  Identify what type of reaction this unbalanced equation is. 

• Single replacement

• Double replacement

• Synthesis

• Decomposition

Explain why this statement is incorrect.

After some wood has completely burned in a fire, some of the matter that made up the wood has been destroyed.

Tags

NGSS.HS-PS1-7