Intro To Chemistry

Chemistry is the study of

life and living organisms.

the composition, structure, and properties of matter.

the motions, forces, and energy applied to matter.

the Earth and its ecosystems.

the composition, structure, and properties of matter.

In the claim-evidence-reasoning framework (CER), what is the main purpose of the "Evidence" component?

To provide a statement that answers the problem or question.

To explain why the answer is scientifically valid.

To summarize all supporting data.

To outline the process used to gather evidence.

To summarize all supporting data.

What task would the piece of lab equipment shown below (Mortar and Pestle) be the most helpful for?

Hold four different test tubes needed for an experiment.

Crushing a chunk of chemical into powder.

Scoop ammonium nitrate out of its container and onto weigh paper to be measured.

Keep contents in a beaker from splattering when boiling chemicals.

Crushing a chunk of chemical into powder.

Which of the following is an example of quantitative data?

The cat is sleepy.

The cat has one tail.

The cat is orange.

The cat is soft.

The cat has one tail.

Which of the following is an example of qualitative data?

Temperature

Volume

Height

Condition

Condition

A student weighs a pebble three times using a balance.

Their results for the three trials are 5.31 g, 5.32 g, and 5.31g. The actual mass of the pebble is 5.31 g.

The measurements are

precise.

accurate.

accurate and precise.

neither accurate nor precise.

accurate and precise.

A measurement is said to have good accuracy if

it agrees closely to the accepted value.

repeated measurements are consistent with each other.

it is a large whole number.

it has a small number of significant figures.

it agrees closely to the accepted value.

What unit is used to measure the amount of heat in an object?

m (meter)

K (Kelvin)

kg (kilogram)

s (seconds)

K (Kelvin)

What unit would make the most sense when describing the mass of a penny?

2,500,000 micrograms

2.5 grams

0.0025 kilograms

0.0000025 megagrams

2.5 grams

How many significant figures are in the measurement 0.096 kg?

2

3

4

5

2

How many significant figures are in the measurement 50050 mL?

2

3

4

5

4

Why is the underlined value in the measurement below significant?

(The 0)

1.05 cm

It is a non-zero number.

It is a placeholder, so it is not significant.

It is a trailing zero.

It is a sandwiched zero.

It is a sandwiched zero.

In an experiment, the component that is measured in response to the changes made by the scientist is the

control group.

experimental group.

independent variable.

dependent variable.

dependent variable.

A student conducts an experiment to determine the effect of adding salt on the boiling temperature of water. The results are shown below.

Amount of salt added

Volume of water

Boiling temperature

Time required for water to boil

Amount of salt added

Which of the following numbers has two significant figures?

0.6

0.095

1001

0.304

0

When determining significant figures for multiplication and division, the final answer is based on whatever value had the

least number of significant figures.

most number of significant figures.

least number of decimal places.

most number of decimal places.

least number of significant figures.

Select the answer with the correct number of significant figures.

56.20 x 9.2057

517.3

517.4

517.36

517.00

517

Select the answer with the correct number of significant figures.

123.456 - 7.89

115.6

115.57

115.566

115

115

In standard notation, 4.3 x 10^8 is the same as

0.000000043

430,000,000

430,000

4.3

430,000,000

Which example is properly written in scientific notation?

0.52 x 10^2

5.2 x 10^2

52

52 x 10^2

5.2 x 10^2

In scientific notation, 0.00021 is the same as

2.1 x 10^-4

2.1 x 10^4

21 x 10^-5

21 x 10^5

2.1 x 10^-4

What type of matter can be physically separated?

An Atom

An Element

A Compound

A Mixture

A Mixture

An example of a heterogeneous mixture is

vegetable soup.

stainless steel.

clean air.

bleach.

vegetable soup.

An example of an intensive property is

volume.

melting point.

mass.

amount of energy.

melting point.

A property of matter that depends on the amount of matter present would be considered a(n) _____ property.

chemical

physical

extensive

intensive

extensive

Which of these is an example of a chemical property?

Color of an object

Reactivity

Cutting wood

An apple actively rotting

Reactivity

Physical changes result in

a change in the state or condition of a substance, and its identity.

a change in the state or condition of a substance, but not its identity

a change in the identity of a substance, but not its state or condition.

unpredictable changes to the state, condition, and identity of a substance.

a change in the state or condition of a substance, but not its identity.

Each circle in the particle-view below represents an atom. This is an example of a(n)

element

compound.

mixture of different elements.

mixture of different compounds.

compound

Matter with a definite shape and definite volume would be considered a

gas.

liquid.

solid.

plasma.

solid.

Which of the following is not necessarily evidence of a chemical reaction?

The release of light.

A sudden change in temperature.

An object boiling from a liquid to a gas.

The sudden appearance of a precipitate.

An object boiling from a liquid to a gas.