Quiz about Chemistry Final

Question 1

When you take a water bottle out of the freezer the solid melts into a liquid. This is an example of a _____ change.

Accepted Answer

physiclal

Answer

chemical

Answer

both physical and chemical change

Answer

neither

Question 2

Which element is least likely to conduct heat and electricity? (Use periodic table)

Accepted Answer

O

Answer

Ca

Answer

Po

Answer

Si

Question 3

This picture is a model of a..

Accepted Answer

heterogeneous mixture

Answer

element

Answer

compound

Answer

homogeneous mixture

Question 4

Chemical properties are

Accepted Answer

properties that describe how a substance changes into a completely different substance

Answer

properties that can be observed without changing the identity of the substance

Answer

properties that we can only observe with our eyes

Answer

properties that we need special tools to observe

Question 5

How many total atoms are in this compound?

H₅C₂O₈N₅

Accepted Answer

20

Answer

5

Answer

23

Answer

15

Question 6

Describe the accuracy and precision of the image

Accepted Answer

Not accurate and not precise

Answer

Accurate and precise

Answer

Accurate but not precise

Answer

Not accurate but precise

Question 7

If there is no subscript, there is/are ______ atom(s) of that element.

Accepted Answer

only 1

Answer

0

Answer

2

Answer

1 million

Question 8

In a stable (neutral) atom, the total number of protons is equal to the number of __________________.

Accepted Answer

electrons

Answer

neutrons

Answer

atomic mass

Answer

neutrons + protons

Question 9

What is the measurement of water in the beaker?

Accepted Answer

47 mL

Answer

50 mL

Answer

40 mL

Answer

57 mL

Question 10

This image is a model of...

Accepted Answer

a compound

Answer

an element

Answer

a homogenous mixture

Answer

a heterogeneous mixture

Question 11

What is the mass number?

Accepted Answer

110

Answer

47

Answer

63

Answer

157

Question 12

What are H₂ + O₂in the equation

2H₂ + O₂--> 2H₂O?

Accepted Answer

Reactants

Answer

Products

Answer

Starters

Answer

Enders

Question 13

Why must we balance chemical equations?

Accepted Answer

to follow the Law of Conservation of Mass

Answer

Our teacher said so

Answer

to follow the Avogadro's Law

Answer

to follow the Law of Multiple Proportions

Question 14

What is the part of the chemical equation in green called?

Fe + S --> FeS

Accepted Answer

products

Answer

reactants

Answer

yield

Answer

chemical formula

Question 15

How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl₂ + H₂

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 16

What type of reaction is the following?

2H₂O ----> 2H₂ + O₂

Accepted Answer

decomposition

Answer

synthesis/composition

Answer

single replacement

Answer

double replacement

Answer

combustion

Question 17

How many cm are in 34 m? (1m=100cm)

Accepted Answer

3400

Answer

3.4

Answer

340

Answer

.34

Answer

.034

Question 18

Based on the position in the periodic table, which one of the following atoms would you expect to be the most electronegative?

Accepted Answer

F

Answer

Ge

Answer

P

Answer

Se

Question 19

Find the density of a sample of aluminum with a mass of 16 g and a volume of 5.55 cm³. Round your answer to the nearest tenth. (Density = Mass/ volume)

Accepted Answer

2.88 g/cm³

Answer

0.35 g/cm³

Answer

10.45 g/cm³

Answer

21.55 g/cm³

Question 20

Lewis dots structure of NaCl shows that

Accepted Answer

All of the above

Answer

1 valence electron of Na is lost

Answer

1 valence electron is gained by Cl

Answer

Cl has 8 electrons & Na shows none

Question 21

How does Ultraviolet rays compare to visible light on the electromagnetic spectrum?

Accepted Answer

Ultraviolet rays have shorter wavelengths and more energy than visible light.

Answer

Ultraviolet rays have longer wavelengths and more energy than visible light.

Answer

Ultraviolet rays have longer wavelengths and less energy than visible light.

Answer

Ultraviolet rays have shorter wavelengths and less energy than visible light.

Question 22

This particle determines what element you have - the element's identity.

Accepted Answer

proton

Answer

electron

Answer

neutron

Question 23

When two atoms share electrons, a chemical bond is formed. This type of bond is called:

Accepted Answer

covalent

Answer

ionic

Answer

crystal

Answer

polyatomic

Question 24

What is a triple bond?

Accepted Answer

three pairs of electrons shared between two atoms

Answer

a bond between two atoms

Answer

one pair of electrons shared between two atoms

Answer

two pairs of electrons shared between two atoms

Question 25

Maximum number of electrons that can be placed in a p orbital.

Accepted Answer

6

Answer

2

Answer

10

Answer

14

Question 26

Electronegativity is...

Accepted Answer

how good an atom is at attracting electrons

Answer

the ability of an atom to lose electrons

Answer

the energy required to remove an electron from a specific atom

Answer

how easy it is to move electrons between energy levels

Question 27

If an element has an atomic number of 4 and the number of neutrons is 4, what is the mass number?

Accepted Answer

8

Answer

12

Answer

4

Answer

10

Question 28

Potassium has an atomic number of 19. A stable potassium atom has an electronic configuration of:

Accepted Answer

1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

Answer

1s²1p⁶1d¹⁰1f²

Answer

1s² 2s² 2p⁶ 3s² 3p⁶ 3d²

Answer

1s² 2s²2p⁶ 3s² 3p⁶

Answer

1s² 1p⁶ 2s² 2p⁶ 3s² 3p²

Question 29

Which neutral atom has the follwing configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10

Accepted Answer

cadmium (Cd)

Answer

copper (Cu)

Answer

silver (Ag)

Answer

gold (Au)

Question 30

Which neutral atom has the following electron configuration: |Xe| 6s² 4f¹⁴5d⁴

Accepted Answer

Tungsten (W)

Answer

Rhenium (Re)

Answer

Hassium (Hs)

Answer

Lutetium (Lu)

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