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UNIT 1 Review!! Lesson 1-5

Total questions: 39

Worksheet time: 20mins

Name
Class
Date
1.

What is atom?

a)

the basic unit of living organism

b)

determine the type of element composing

c)

basic building block for all matter in universe

d)

it can undergo chemical reaction, sharing of electrons

2.

Atomic Mass

a)

Proton + Neutron

b)

Proton + Electron

c)

Atomic number + Neutron

d)

Electron + Neutron

3.

Which statement is TRUE?

a)

Atoms as building blocks of matter, have volume that occupies space

b)

The neutron does have charge

c)

Atoms as extremely small and are made up matter

4.

What are molecules?

a)
Molecules are groups of two or more atoms bonded together.
b)
Molecules are larger than cells and make up tissues.
c)
Molecules are only found in gases and not in solids or liquids.
d)
Molecules are single atoms that exist independently.
5.

What is chemical bonding?

a)
Chemical bonding is the repulsion between atoms that prevents them from forming compounds.
b)
Chemical bonding is the attraction between atoms that allows the formation of chemical compounds.
c)
Chemical bonding refers to the physical separation of atoms in a gas state.
d)
Chemical bonding is the process of breaking down compounds into individual atoms.
6.

What are the 2 types of chemical bonding?

a)
Ionic bonding and covalent bonding
b)

Covalent bonding and ironic bonding

c)
Ionic bonding and metallic bonding
d)
Metallic bonding and hydrogen bonding
7.

Covalent Bonds ...

a)

share neutrons between atoms

b)

electron is donated to another

c)

giving out netrons between atoms

d)

share electrons between atoms

8.

Choose an example of covalent bond.

a)

Water (H2O)

b)
Calcium carbonate (CaCO3)
c)
Iron oxide (Fe2O3)
d)
Sodium chloride (NaCl)
9.

Choose an example for the ionic bond.

a)
Sodium chloride (NaCl)
b)

Oxygen (O2)

c)

Water (H2O)

d)

Carbon Dioxide (CO2)

10.

What type of bond?

a)

Covalent bond

b)

ionic bond

11.

Which type of bond?

a)

ionic bond

b)

covalent bond

c)

hydrogen bond

d)

carbon bond

12.

Organic compounds are compounds that contain _______.

a)

water

b)

hydrogen

c)

carbon

d)

oxygen

13.

_______ is a super long molecule that has information uniquely describing every human being.

a)

TNA

b)

PTA

c)

DNA

d)

mRNA

14.

Which statement is NOT TRUE?

a)

Each element has its own unique atom which is made up of a specific number of protons

b)

The number of protons determines the atomic number of the element

c)

Each atom also has the same number of electrons as protons

d)

Atomic mass = no. of neutrons + no. of electrons

15.

Atomic Number =

a)

atomic number + element

b)

no. of protons + no. of elements

c)

no. of neutrons + atomic number

d)

no. of protons = type of element

16.

What charge is a proton?

a)
Negative charge
b)
Neutral charge
c)
Variable charge
d)
Positive charge
17.

What charge is a neutron?

a)
A neutron has a negative charge.
b)
A neutron has a variable charge.
c)
A neutron has no charge.
d)
A neutron has a positive charge.
18.

Which one is the negatively charged?

a)
Hydrogen atoms
b)
Neutrons
c)
Protons
d)
Electrons
19.

12.011 is the ______?

a)
density of carbon
b)
atomic number of carbon
c)
molecular weight of carbon dioxide
d)
atomic mass of carbon
20.

What does 6 in the image represent?

a)

atomic number

b)

number of neutrons

c)

atomic weight

d)

symbol

21.

What is an Isotope?

a)
An isotope is a molecule made of different elements.
b)
An isotope has the same number of neutrons but different protons.
c)
An isotope is a type of chemical bond.
d)
An isotope is a variant of an element with the same number of protons but different numbers of neutrons.
22.

Changing the number of neutrons in an atom does not change the element. True or False

a)

true

b)

false

23.

What is a stable isotope?

a)
A stable isotope is a variant of an element that does not undergo radioactive decay.
b)
A stable isotope is a variant of an element that decays rapidly.
c)
A stable isotope is an element that can only exist in gaseous form.
d)
A stable isotope is a type of element that is always radioactive.
24.

Which statement is true about isotopes and radioactivity?

a)
Isotopes are always stable forms of elements.
b)

Isotopes produce radioactivity when their nuclear compositions is imbalanced, leading to unstable nucleus that seeks stability through radioactive decay and the emission of energy

c)
Radioactivity is the process of creating new isotopes.
d)
Isotopes have the same number of protons and electrons only.
25.

What are the 3 phases of matter?

a)
Solid, Liquid, Gas
b)
Plasma, Vapor, Foam
c)
Gas, Liquid, Mist
d)
Solid, Liquid, Plasma
26.

When does a matter change its state?

a)

A matter changes its state, when more energy (temperature or pressure) gets added to it.

b)
A matter changes its state only when it is heated.
c)
A matter changes its state at absolute zero temperature.
d)
A matter changes its state due to chemical reactions only.
27.

What phase of matter is this?

a)

solid

b)

liquid

c)

gas

d)

plasma

28.

What phase of matter is this?

a)

Plasma

b)

Gas

c)

Liquid

d)

Solid

29.

What phase of matter is this?

a)

Gas

b)

Solid

c)

Liquid

d)

Plasma

30.

What do you call if a phase changes from solid to liquid?

a)
Condensation
b)
Melting
c)
Sublimation
d)
Freezing
31.

What do you call if a phase changes from liquid to gas?

a)
Freezing
b)

Vaporation

c)
Condensation
d)
Sublimation
32.

What do you call if a phase changes from liquid to solid?

a)
Melting
b)
Freezing
c)
Evaporation
d)
Condensation
33.

Definite volume, definite shape

a)
Plasma
b)
Gas
c)
Solid
d)
Liquid
34.

No definite shape, Definite volume

a)
Liquid
b)
Gas
c)
Plasma
d)
Solid
35.

No definite shape, No definite volume

a)
Solid
b)
Gas
c)
Liquid
d)
Plasma
36.

Boiling point is when molecules will gain enough energy to break free and become a gas. True or False

a)

True

b)

False

37.

The boiling point for water is _______?

a)

200 degrees F

b)

200 degrees C

c)

100 degrees C

d)

100 degrees F

38.

What is 'standard state'?

a)
The standard state is the temperature at which a substance boils.
b)
The standard state refers to the maximum pressure a substance can withstand.
c)
The standard state is the condition of a substance at 0 degrees Celsius and 1 atmosphere.
d)

The standard state is the physical state of one atmosphere of air pressure and 25 degrees Celsius.

39.

What causes the ice and salt experiment to break its bond?

a)

The salt absorbs heat from the ice, causing it to melt.

b)

The salt lowers the freezing point of the ice, causing it to melt faster.

c)

The salt raises the freezing point of the ice, keeping it solid.

d)

The salt creates more ice, making the bond stronger

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