density

Question 1

What is Density?

Answer 1

Density is the ratio of mass to volume. This physical property is often used to identify and classify substances.

Question 2

Formula for Density

Answer 2

Density =
Mass/Volume

Question 3

Density is expressed in

Answer 3

g/mL or g/cm^3

Question 4

What is Mass?

Answer 4

The amount of matter in an object

Question 5

Formula for Mass

Answer 5

Mass = Density
× Volume

Question 6

Mass is expressed in

Answer 6

Grams (g)

Question 7

What is Volume?

Answer 7

The amount of space an object takes up

Question 8

Three Formulas for Volume

Answer 8

1. Length x Width
   × Height
2. Volume =
   Mass/Density
3. Final Vol. - Initial
   Vol. = Object Vol.
   (volume by displacement)

Question 9

Volume is expressed in

Answer 9

cubic meters (cm^3) or milliliters (mL)

Question 10

How do you find the volume of an irregular object?

Answer 10

Submerge the object in water inside a graduated cylinder, then use the water
displacement
formula. (Final Vol. -
Initial Vol. = Obiect
Vol.)

Question 11

How do you know when to use cubic meters or milliliters?

Answer 11

cm^3 = Solids & mL
= Liquids (these are equal)

Question 12

Does density change with temperature?
Explain.

Answer 12

Yes, heating an object generally causes it to expand.

Question 13

For objects with equal volumes..

Answer 13

The denser object will have a larger mass.

Question 14

For objects with equal masses…

Answer 14

The denser object will have a smaller volume.

Question 15

What is the density of Water?

Answer 15

1 g/mL

Question 16

If the density of an object is less than 1..

Answer 16

It will Float

Question 17

If the density of an object is greater than 1..

Answer 17

It will Sink

Question 18

What do all objects that float have in common?

Answer 18

They have a larger volume than mass

Question 19

What do all objects that sink have in common?

Answer 19

They have a larger mass than volume

Question 20

Does mass or volume alone determine whether an object will sink or float?

Answer 20

No, you need both mass and volume to determine

Question 21

What is a Miniscus?

Answer 21

The meniscus is the dip in water usually seen in a measuring cylinder. (this is where you determine your measUrement)

Question 22

How do you find the measurment scale on a Graduated
Cylinder?

Answer 22

Take two given measurements on the cylinder (ex. 60 mL and 50 mL) and subtract (you get 10 mL). Take this answer and divide
it by 10 (10mL/10 = 1
mL). Your answer will be the measurement scale (in this example, the scale goes by ones).

Question 23

What do you round to when Measuring in a Graduated
Cylinder?

Answer 23

Find the known values first (which are before the decimal point), and then estimate the last digit (which will go after the decimal point

Question 24

What is an Atom?

Answer 24

The smallest particle of an element

Question 25

What are Subatomic Particles?

Answer 25

Protons, Neutrons, and Electrons, which Atoms are composed of

Question 26

What is a Nucleus?

Answer 26

A tiny, dense region in the center of an atom

Question 27

The nucleus contains what percentage of the entire atom's mass?

Answer 27

99.97%

Question 28

Where are Protons and Neutrons Located?

Answer 28

Inside the Nucleus

Question 29

Where are Electrons located?

Answer 29

Outside the nucleus in an Electron Cloud

Question 30

Mass of Protons and Neutrons?

Answer 30

1 amu (atomic mass unit)

Question 31

Mass of Electrons?

Answer 31

0 amu (atomic mass unit) or 1/1840

Question 32

Charge of a Proton?

Answer 32

+1 (positive)

Question 33

Charge of a Neutron?

Answer 33

0 (none)

Question 34

Charge of an Electron?

Answer 34

-1 (negative)

Question 35

Symbol for Protons?

Answer 35

p+

Question 36

Symbol for Neutrons?

Answer 36

n^0

Question 37

Symbol for Electron?

Answer 37

e-

Question 38

The atomic number of an element is equal to?

Answer 38

The number of protons

Question 39

The number of electrons is equal to?

Answer 39

The number of protons

Question 40

The mass of an element is equal to?

Answer 40

The number of protons + the number of neutrons

Question 41

Where is the atomic number located?

Answer 41

Top left corner

Question 42

Where is the atomic mass located?

Answer 42

On the bottom of the element under the symbol

Question 43

What is an ion?

Answer 43

An atom with a negative or positive charge due to an uneven amount of either protons or electrons

Question 44

How can you tell if an atom has a negative charge?

Answer 44

There will be more electrons than protons, which would be shown by a negative exponent above the element symbol

Question 45

How can you tell if an atom has a positive charge?

Answer 45

There will be fewer electrons than protons, which a positive exponent above the element symbol would show

Question 46

Identify the Number of protons and electrons in Co +2

Answer 46

Protons = 27 & Electrons = 25

Question 47

Identify the Number of protons and electrons in P -3

Answer 47

Protons = 15 & Electrons = 18

Question 48

What would happen if the number of PROTONS were to change in an atom?

Answer 48

The charge of the nucleus and the atomic number (which is always equal to its number of protons) would change, resulting in a different element

Question 49

What is an Isotope?

Answer 49

Atoms of the same element that have different numbers of neutrons (which affect its mass)

Question 50

In an isotope name, what does the number after the element name represent?

Answer 50

Its mass

Question 51

What does symbolic notation for isotopes look like?

Answer 51

The element symbol with a small number at the top representing the mass and a small number below representing the element number

Question 52

What's the equation showing the relationship between an atom's atomic number and its mass number?

Answer 52

Mass # - Atomic # = # of Neutrons

Question 53

Why are atoms neutral despite having charged particles?

Answer 53

Because there are equal amounts of of positive protons and negative electrons in the neutrons, which cancel each other out