8.6E The Law of Conservation of Mass RETEACH

Which statement provides evidence that mass is conserved in the reaction

• Two new substances are formed in the products.

• Water is one of the products, but not one of the reactants

• . Two hydrogen atoms are in the reactants, and two hydrogen atoms are in the products

• One chlorine atom pairs with one sodium atom in the products, and one chlorine atom pairs with one hydrogen atom in the reactants

Tags

NGSS.MS-PS1-5

How many grams of sulfuric acid were used in the reaction?

• 62 g

• 98 g

• 36 g

• 100 g

Tags

NGSS.HS-PS1-7

Jesus was conducting an experiment in science class. He took a flask and measured 50mL of vinegar into it. He then measured 10g of baking soda into a balloon and attached the balloon to the flask, covering the mouth of the flask completely. Next, he puts the flask with the balloon attached on a digital balance and finds the total pre-reaction mass of his experiment. Finally, leaving the flask and balloon set up on the digital balance, he lifts the balloon and mixes the chemicals. How should the total mass be affected by the chemical reaction?

• The total mass will become heavier because the reaction is making a new substance, so the flask will sink on the balance.

• . The total mass will become lighter since one of the products is a gas, so the flask will rise on the balance

• The total mass will become lighter since the reactants are being used up, so the flask will rise on the balance.

• . The total mass will stay the same since mass is neither created nor destroyed by a chemical reaction, so the balance will remain level.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which of the following models best demonstrates the law of conservation of mass?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-5

Plants perform a chemical reaction known as photosynthesis in which light energy is converted into chemical energy in the form of sugars. The chemical equation for photosynthesis is displayed. Which statements accurately describe the chemical reaction process that plants undergo? Select TWO correct answers.

• No new substances are produced during the process of photosynthesis since it is a chemical reaction.

• There are more carbon (C) atoms on the products side of the equation than there are on the reactants side.

• . A new substance is produced during photosynthesis because photosynthesis is a chemical reaction.

• . A new substance is produced during photosynthesis because photosynthesis is a chemical reaction.

• . The number of oxygen (O) atoms is the same on the reactants and products side of the chemical reaction.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

If 100 g of potassium reacts with 24 g of oxygen, what is the mass of potassium oxide produced?

• . 76 g

• . 100 g

• 124 g

• 124,000 g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2