chemical reactions

Students performed four investigations in which they combined a white solid substance with 4 different liquids. In each investigation, the students combined the solid with a liquid in a test tube and recorded observations in the table in the image.

Which investigations in the image above show evidence of a chemical reaction? Select all that apply.

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-2

Which are the following are evidence of a chemical reaction?

• bubbles or producing a gas

• new substance forms

• change in odor

• emission of energy

Tags

NGSS.MS-PS1-2

Leandra is learning about chemical reactions and she wants to examine the information that is included in a chemical equation. Which pieces of information does a chemical equation include? Choose the three that apply.

• how long the reaction will take

• the kinds of molecules involved in the reaction

• the kinds of elements that make up a molecule

• whether the molecules are products or reactants

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

a substance formed by a chemical reaction

• catalyst

• law of conservation

  of mass

• product

• exothermic reaction

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A scoop of baking soda is added to a beaker containing vinegar. The baking soda disappears and bubbles are observed. This is an example of a _____________ change.

• chemical

• nuclear

• phase

• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

the process that produces new substances by changing the way atoms are arranged

• reactant

• law of conservation

  of mass

• bond energy

• chemical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the equation shown, what are the product(s)?

• N₂ + H₂

• NH₃

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

a substance that is present at the beginning of a chemical reaction and is changed into a new substance

• reactant

• catalyst

• coefficient

• respiration

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How does this chemical equation support the Law of Conservation of Mass?

2H₂O ---> 2H₂ + O₂

• It does NOT because the Hydrogen is unbalanced.

• It does NOT because the Oxygen is unbalanced.

• It does because the number of atoms of each element are the same on both sides.

Tags

NGSS.MS-PS1-5

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24

Tags

NGSS.MS-PS1-1