Chemistry

What happens to the mass of the reactants during this chemical reaction?

• mass of oxygen stays the same

• mass of hydrogen doubles

• mass of oxygen decreases

• mass of hydrogen increases

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown. Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?

• The mass of the reactants is the same as the mass of the products.

• The products have a greater mass because matter was created during the reaction.

• The reactants have a greater mass because some of the mass was converted to heat.

• The reactants have a greater mass because some matter was destroyed by the reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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.

• There are fewer hydrogen (H) atoms on the products side of the equation than there are on the reactants side.

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-LS1-6

Drew added yeast and sugar to lukewarm water and placed it in a flask. He stretched a balloon over the opening of the flask. After several minutes, he noticed small bubbles rising along the side of the flask as the balloon slowly began to inflate. How should the mass compare before and after the reaction?

• The mass should be the same since matter is neither created nor destroyed.

• The mass of the flask/balloon complex after the reaction would weigh more since something new was created.

• The mass of the flask/balloon complex after the reaction should be less since a gas was created.

• The mass of the flask/balloon complex after the reaction should be less because the reactants are used up during the chemical reaction.

Tags

NGSS.MS-PS1-5

A student creates a mixture of water and washing soda weighing 10g and a mixture of water and epsom salts weighing 15g. He knows that when he mixes the two substances a chemical change will occur. According to the law of conservation of mass, what should the weight of the products be after he mixes them?

• 10g

• 15g

• 5g

• 25g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many total atoms does C₆H₁₂O₆ contain?

• 2

• 6

• 12

• 24

Tags

NGSS.MS-PS1-1

In the above formula, how many atoms of carbon are on the product side of the equation?

• 6

• 2

• 13

• 12

Tags

NGSS.MS-LS1-6

Which of the following is correct?

• reactants ← products

• reactants products

• reactants → products

• reactants = products

Tags

NGSS.MS-PS1-5

Calcium carbonate is used to treat acid reflux, which is sometimes called heartburn. What happens when calcium carbonate reaches the stomach?

• Calcium carbonate absorbs excess stomach acid.

• Calcium carbonate neutralizes acid in the stomach.

• Calcium carbonate increases the acidity of the stomach.

• Calcium carbonate causes acid in the stomach to precipitate.

A type of juice has a sour taste. Which term describes the juice?

• acidic

• basic

• neutral

• saline