Chemical and Physical Reactions Concepts

A student mixes two substances and observes a rise in temperature and small, white particles that fall to the bottom of the test tube. What conclusion can be drawn?

• 
  A physical reaction occurred because of the temperature change.

• A chemical reaction occurred because a new substance was formed.

• A physical reaction occurred because it can be reversed by filtering out the particles.

• A chemical reaction occurred because two substances were mixed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

While cooking dinner, a student places a pot full of water on the stove to heat up. The student notices that small bubbles start to appear at the bottom of the pot after three minutes.

What type of property of water is the student observing?

• A chemical property because the water is changing to steam.

• A chemical property because the water is reacting with the pot.

• A physical property because the water is changing to steam.

• A physical property because the water is reacting with the pot.

What are two ways you can tell that the physical properties of a substance changed during a chemical reaction?

• change in color

• the substance dissolves

• changing from a solid to liquid

• appearance of bubbles

• production of gas

Tags

NGSS.MS-PS1-2

What is the 2 called in the product of the balanced equation below?

H₂ + Cl₂ = 2HCl

• subscript

• coefficient

• atomic number

• atomic mass

Which chemical equation supports the law of conservation of matter?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Review the diagram of a chemical equation.

How does this diagram support the Law of Conservation of Matter?

• It has products and reactants.

• A chemical change has occurred.

• 
  The number of atoms of the products equals the number of atoms of the reactants.

• The number of atoms of the products and reactants equals an even number.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The box shows the formula for a common substance.

Which statement is true about the substance?

• It is composed of 2 atoms of hydrogen and 1 atom of oxygen.

• It is composed of 3 different elements.

• It is composed of 2 atoms of oxygen and 1 atom of hydrogen.

• It is composed of 3 different compounds.

Tags

NGSS.MS-PS1-1

The equation for a chemical reaction is shown.

How many oxygen atoms are on the reactant side of the equation?

• 2

• 6

• 4

• 10

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Analyze the chemical reaction shown.

What are the products of the chemical reaction?

• Fe and Cu

• FeSO₄ and Cu

• Fe and CuSO₄

• FeSO₄ and CuSO₄

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5