Physical Science Midterm

Unit 1: Measurement

100

What unit of metric measurement should be used to measure the height of a door?

meter

200

What unit of measurement should be used for a very small amount of liquid? 

mL (milliliter)

300

Valery designs an experiment to see if that amount of water given to a plant affects its height.  What is the independent variable?

amount of water

400

Valery designs an experiment to see if that amount of water given to a plant affects its height.  What is the dependent variable?

Plant height

500

Valery designs an experiment to see if that amount of water given to a plant affects its height.  Identify 2 controls.

Answers may vary (ex: soil, sunlight, type of plant)

Unit 2: Matter

100

Physical or Chemical Change: Two clear liquids mix to produce a milky color 

Chemical

200

The phase change that is the reverse of condensation is:

boiling

300

How does the motion of hotter particles compare to the motion of cooler ones?

Hotter particles are faster

400

Look at Ms. Duarte's graph.  Which segments represent a phase change?

the flat segments

500

Look at Ms. Duarte's graph.  During which segment does the substance have the least kinetic energy? 

a

Unit 3: Atomic Theory

100

What do all elements of the same atom have in common?

Same number of protons

200

Which two particles must have an equal number for the atom to have a nuclear charge

Protons and electrons

300

Atomic mass is the sum of which two particles

Protons and neutrons

400

How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain

50 protons

50 electrons

75 neutrons

500

₁₆³²S^-2

Identify the number of protons, neutrons, and electrons in the above atom

16 protons

16 neutrons

18 electrons

Unit 4: Bonding & Reactions

100

How many valence electrons does every atom want?

8

200

When two nonmetals share an electron they have what type of bond?

Covalent

300

When a metal transfers an electron to a nonmetal they become what type of bond?

Ionic

400

What type of reaction is represented below?

AlCl3 + NaOH ⟶ Al(OH)3 + NaCl

Double replacement

500

Name that reaction?

KOH ---> K2O + H2O

Decomposition

Unit 5: Nuclear

100

Which type of nuclear decay is the most dangerous?

gamma

200

The time it takes for a radioactivity level to drop by a half is is the sample's _________________________

half-life

300

In nuclear powerplants, scientists make atoms split apart.  The splitting of a nucleus is called...

fission

400

Why is radioactive waste a major drawback to nuclear energy? (as compared to other types of waste?)

Answers may vary: it causes cancer, must be stored for long periods of time

500

When an atom undergoes alpha decay, the mass decreases by

4