Chemical Reactions & Atomic Structure (Sischo)

Based on its location on the partial periodic table shown above, which element would you predict has properties that are most similar to argon (Ar)?

• Chlorine (Cl)

• Helium (He)

• Zinc (Zn)

Helium has an atomic number of two because it has two (a)   .

• Protons
• Neutrons

• Electrons

• Nucleons

Tags

NGSS.MS-PS1-1

Select all of the following events in which a chemical change occurs.

• B. Toast is lightly charred in a toaster.

• E. Sugar is heated until it turns into a brown caramel sauce.

• C. A piece of paper is cut up into 12 pieces.

• A. Chocolate syrup dissolves into warm milk.

What atoms combine to make up a molecule of water?

• 1 hydrogen, 2 oxygen

• 2 hydrogen, 1 oxygen

• 2 hydrogen, 2 oxygen

Tags

NGSS.MS-PS1-1

What three fundamental particles are atoms made of?

• molecules

• protons

• electrons

• carbon

• neutrons

Which of the following correctly summarizes the process of ice turning into water and then into steam?

• a solid to a liquid to a gas

• a gas to a liquid to a solid

• a liquid to a solid to a gas

Tags

NGSS.MS-PS1-4

Water and phosphorus with a total mass of 200 grams are added to a flask like the one below and then the flask is stoppered. The flask is then heated up so that a reaction occurs but no gas from the reaction escapes the flask. What mass do you expect to be in the flask after the reaction occurs?

• 200 grams

• less than 200 grams

• more than 200 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student creates a ball-and-stick model to represent the atomic scale of a substance. Which of these best describes the model?

• 1 molecule with 10 atoms

• 1 element with 10 molecules

• 10 elements representing 10 molecules

Tags

NGSS.MS-PS1-1

How does the mass of the reactants in an equation compare to the mass of the products?

• it is the same

• it is smaller

• it is greater

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Use the chart to identify whether a chemical reaction or a physical change occurred between the combined substances.

Solid A & Liquid A - (a)  

Solid A & Liquid B - (b)  

Solid B & Liquid A - (c)  

Liquid A & Solid B - (d)  

• Chemical Change
• Physical Change