Chemical Equations, Acids and Bases

Presentation

•

Physics, Science

•

7th - 8th Grade

•

Medium

•

NGSS

MS-PS1-5, MS-PS1-2, MS-PS1-1

Standards-aligned

Rachael Lasky

Used 9+ times

FREE Resource

7 Slides • 19 Questions

Chemical Equations, Reactions, Mixtures, Acids and Bases

Multiple Choice

In a chemical reaction, ________________________ are changed into _______________________.

Reactants; Products

Electrons; Molecules/Compounds

Coefficients; Subscripts

Original Elements; New Elements

Multiple Select

In the molecule below, which of the following choices is a subscript? (Select all that apply)

Multiple Choice

How many sulfur atoms are present in this molecule?

Multiple Choice

How are chemical bonds formed?

Atoms duplicate themselves

Electrons move from one atom to another

The number of protons and electrons in an element is changed

Through changes in an atom's nucleus

Multiple Choice

The first part of a balanced chemical equation is shown: Cu + 2AgNO₃ → ________. In order for this equation to be balanced, how many oxygen (O) atoms must be present in the products?

Multiple Choice

The law of conservation of matter states that:

matter is neither created nor destroyed.

the mass of the products is always greater than the mass of the reactants.

the mass of the products is always less than the mass of the reactants.

matter is always converted into an equal amount of energy.

Multiple Choice

A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H₂The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?

Na₂Cl + H₂

2NaCl + H₂

NaCl + 2H₂

2NaCl + 2H₂

Multiple Choice

The idea that matter is neither created nor destroyed in chemical reactions is known as the:

law of conservation of energy.

law of conservation of mass.

second law of thermodynamics.

Multiple Choice

The first part of a balanced chemical equation is shown: H₂SO₄ + 2NaOH → ________. In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?

Multiple Choice

Copper chloride and aluminum react to produce aluminum chloride and copper. Which of the following is the correctly balanced chemical equation for this reaction?

CuCl₂ + Al -> AlCl₃ + Cu

3CuCl₂ + Al -> AlCl₃ + 2Cu

3CuCl₂ + 2Al -> 2AlCl₃ + 3Cu

CuCl₂ + 3Al -> AlCl₃ + 2Cu

Multiple Choice

Before a chemical reaction, the total mass of two reactants is measured to be 40 grams. After the reaction, what should be the total mass of the products?

0 grams

20 grams

40 grams

80 grams

Multiple Choice

When two substances were combined, bubbles were produced and the temperature dropped. This most likely means that:

a chemical reaction took place

the two substances had low boiling points

one substance dissolved in the other

the two substances are non-reactive

Multiple Choice

The higher the concentration of negative (hydroxide) ions in the solution, the stronger the base is.

True

False

Multiple Choice

An acid is a solution that contains __________ ions dissolved in water.

positive

negative

Multiple Choice

The pH value of an acid represents its __________ of positive ions in the solution

amount

concentration

color

charge

Multiple Choice

The strongest bases have pH values close to

Multiple Choice

Which of the following is a property of a base?

bitter taste

reacts with metals

salty

sour taste

Multiple Choice

Milk is a very weak acid. What might its pH value be?

6.5

7.8

4.2

12.2

Multiple Choice

Which of these pH values represent an acid?

Chemical Equations, Reactions, Mixtures, Acids and Bases

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