# PSC FINAL

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Mass

Nothing the same

the same

moon

5 N east

### An object is pulled with three forces: one at 20 N to the right, another at 40 N to the right, and the third at 30 N to the left. The net force is

none of the above

0 N

Is Zero

160 N

two

10 N

5 yards/second

is constant

### At the end of two seconds of free fall, an object released from rest will have a speed of

none of the above

70 m/s

### An object in motion tends to remain in motion

without the need of a force

### A sheet of paper can be pulled from beneath a box of cereal without toppling it if the paper is jerked quickly. This best demonstrates that

the box has inertia

0

acceleration

acceleration

increases

1500 kg

3 m/s^2

2 m/s^2

### A 10-kg brick and a 1-kg book are dropped in a vacuum. The acceleration of the 10-kg brick is ****

10 times as much as for the 1-kg book.

6N

9.8 m/s^2

More

decreases

0

### Which of the following statements best describes an element

material consisting of only one type of atom

### What is the approximate mass of a carbon atom in atomic mass units (amu)? How about a carbon dioxide molecule?

A carbon atom has a mass of about 12 amu. Carbon dioxide would then have a mass
of 44 amu.

### Which contributes more to an atom's mass: electrons or protons? Which contributes more to an atom's size

Protons contribute to its mass, and electrons contribute to its size.

### Which has more atoms: a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13

a 1-gram sample of carbon-12

15
N
7

33

Ir

### Which of the following statements describes an isotope?

element with the same number of protons but a different number of neutrons

Ge

### The following statement describes which subatomic particle best? It is electrically charged

proton and electron

RB

AG Silver

Li

Cl

periodicity

Group

gas

one

### What is the valence shell?

It is the outermost shell of electrons in an atom

### The two most abundant elements in Earth's crust are

silicon and oxygen

...

formed

### Igneous rock is formed from

crystallization of molten magma

### What is the difference between intrusive and extrusive igneous rocks?

Intrusive: formed below ground, e.g: Granite
Extrusive: formed above ground, e.g: Basalt

sedimentary

### When rock is broken down into smaller and smaller pieces, we say the rock has undergone

mechanical weathering

inorganic solids

are organic

### All minerals are

crystalline solids

### Most minerals can be identified by easily observable physical properties. In order of most useful to least useful, the identifiable physical properties are

hardness, cleavage, density, crystal form, and color

### Color is not a reliable means for mineral identification because

minerals come in a variety of colors, and chemical impurities in the mineral can affect
color

cleavage

hardness

Example: