Chemistry Midterm #1 (S12025) - Christine Kincaid Becerra | Biblioteka

1

What is the first action if a chemical spills?

Inform the teacher immediately

Use paper towels

Clean it up yourself

Ignore and continue working

1

What is the proper way to smell a chemical?

Sniff directly from the container

Waft it towards your nose

Hold it close to your face

Take a deep breath

1

How should you dispose of chemicals after an experiment?

Follow the teacher's disposal instructions

Pour them down the sink

Mix with water and discard

Throw them in the trash

1

What should you do before starting an experiment?

Skip to the experiment

Check social media

Ask your friends for help

Read the lab instructions carefully

1

What is the metric unit for length?

second

liter

meter

kilogram

1

How many millimeters are in a centimeter?

1000

100

10

1

What metric unit measures volume?

liter

joule

gram

meter

1

How many grams are in a kilogram?

1

10

100

1000

1

What is the base unit for mass in the metric system?

degree

liter

meter

gram

1

How many centimeters are in a meter?

10

1

1000

100

1

What is the first step in the scientific method?

Form a hypothesis.

Ask a question or identify a problem.

Analyze the results.

Conduct an experiment.

1

Which of these is an example of a hypothesis?

All plants need sunlight.

Plants grow faster with more sunlight.

Water makes plants grow.

Plants are green.

1

What does a control group do in an experiment?

Changes every time in the study.

Is not relevant to the results.

Tests the hypothesis directly.

Serves as a standard for comparison.

1

What does it mean to analyze data?

Writing down observations.

Making the results look good.

Interpreting and evaluating collected information.

Just collecting numbers.

1

What is a scientific theory?

A well-substantiated explanation of phenomena.

A law proven without evidence.

A guess that is untested.

A single experiment outcome.

1

What phase of matter has a definite shape and volume?

Plasma

Solid

Liquid

Gas

1

What occurs during condensation?

Liquid turns to gas

Gas turns into liquid

Gas turns to solid

Solid turns to liquid

1

What does convection transfer?

Heat through direct contact

Heat through fluid movement

Heat through vibrations

Heat through sunlight

1

Which method transfers heat through contact?

Conduction

Insulation

Convection

Radiation

1

What phase has no definite shape or volume?

Gas

Plasma

Solid

Liquid

1

What occurs during sublimation?

Liquid to gas

Solid to liquid

Solid to gas without melting

Gas to liquid

1

What is the primary mode of heat transfer in space?

Conduction

Radiation

Absorption

Convection

1

What is a mixture?

A solution of solids

A chemical change

A pure substance only

A combination of two or more substances

1

Which process separates components of a mixture?

Chromatography

Filtration

Evaporation

Distillation

1

What happens during evaporation?

Solid changes to liquid

Liquid changes to gas

Temperature remains constant

Gas changes to liquid

1

What is temperature a measure of?

States of matter

Mass of an object

Amount of heat energy

Average kinetic energy of particles

1

Which process absorbs heat from surroundings?

Endothermic

Evaporation

Chromatography

Exothermic

1

What does heat refer to?

State of matter

Transfer of thermal energy

Temperature of a system

Amount of substance

1

What increases when heat is added to a substance?

Mass

Volume

Temperature

Density

1

Which describes an endothermic reaction?

Temperature increases

Light is emitted

Heat is absorbed

Heat is released

1

What does evaporation involve?

Liquid turning into vapor

Gas turning to liquid

Solid melting

Mixing substances

1

What happens to temperature of a system during an exothermic reaction?

Temperature decreases

Mass decreases

Temperature stays the same

Temperature increases

1

In the heat equation Q=mcΔT, what does Q represent?

Change in temperature

Mass of the substance

Heat energy absorbed or released

Specific heat capacity

1

In the heat equation Q=mcΔT, what does m represent?

Specific heat capacity

Change in temperature

Heat energy transferred

Mass of the substance

1

In the heat equation Q=mcΔT, what does c represent?

Heat energy transferred

Change in temperature

Mass of the substance

Specific heat capacity

1

What does ΔT refer to in the heat equation Q=mcΔT?

Specific heat capacity

Mass of the substance

Change in temperature

Heat transferred

1

How many centimeters are in 2 meters?

2,000 cm

2.0 cm

200 cm

20 cm

1

Convert 5 grams to kilograms.

0.005 kg

0.5 kg

0.05 kg

50 kg

1

How many liters are in 750 milliliters?

75 L

7.5 L

0.75 L

0.075 L

1

Convert 3 meters to centimeters.

300 cm

30 cm

3,000 cm

30,000 cm

1

How many kilograms are in 1,500 grams?

150 kg

0.15 kg

1.5 kg

15 kg

1

Convert 250 milliliters to liters.

2500 L

0.25 L

25 L

2.5 L

1

How many centimeters are in 5.5 meters?

5500 cm

550 cm

55 cm

5,500 cm

1

Convert 10 grams to kilograms.

0.1 kg

0.1 g

1 kg

0.01 kg

1

How many liters are in 1,200 milliliters?

12 L

0.12 L

120 L

1.2 L