Question 1

Question

The chemical equation for the reaction between magnesium (Mg) and hydrochloric acid (HCl) is shown.

Mg + 2HCl → MgCl2 + H2

Fiona weighs the magnesium and hydrochloric acid before the reaction and finds a total mass of 55 grams. After the reaction, she measures the mass of the products, magnesium chloride (MgCl2) and hydrogen (H2), and finds a total mass of 55 grams again. Does Fiona's data support the law of conservation of matter, and why?

a
No, because the mass of the reactants is the same as the mass of the products in her data.
b
No, because the mass of the reactants is lower than the mass of the products in her data.
c
Yes, because the mass of the reactants is the same as the mass of the products in her data.
d
Yes, because the mass of the reactants is lower than the mass of the products in her data.
Question 2
An isotope of the element nitrogen has 7 protons and 9 neutrons. What is the name of the isotope?

a
Nitrogen-16
b
Nitrogen-9
c
Nitrogen-7
d
Nitrogen-14
Question 3
Match each arrow with the correct change of state.

Column A
1.
Arrow L:
Arrow L
2.
Arrow M:
Arrow M
3.
Arrow N:
Arrow N
4.
Arrow O:
Arrow O
5.
Arrow P:
Arrow P
6.
Arrow Q:
Arrow Q
Column B
a.Deposition
b.Vaporization
c.Freezing
d.Melting
e.Condensation
f.Sublimation
Question 4
Match each element to its correct group.

Column A
1.
Silver (Ag):
Silver (Ag)
2.
Barium (Ba):
Barium (Ba)
3.
Iodine (I):
Iodine (I)
4.
Argon (Ar):
Argon (Ar)
5.
Potassium (K):
Potassium (K)
Column B
a.Noble Gas
b.Alkali Metal
c.Alkaline Earth Metal
d.Halogen
e.Transition Metal
Question 5
Match the following equations to the type of reaction.

Column A
1.
Synthesis:
Synthesis
2.
Single replacement:
Single replacement
3.
Combustion:
Combustion
4.
Double displacement:
Double displacement
5.
Decomposition:
Decomposition
Column B
a.
2 NaCl + Br2 → 2 NaBr2 + Cl2

b.
Na + Cl → NaCl

c.
2 H2O → 2 H2 + O2

d.
MgBr2 + 2 NaCl → MgCl2 + 2 NaBr

e.
C3H8 + 5 O2 → 3 CO2 + 4 H2O

Question 6
A radioisotope has a half-life of 7.5 hours. How many half lives have occured after 67.5 hours?

a
7 half-lives
b
8 half-lives
c
9 half-lives
d
10 half-lives
Question 7
In what group and period does Barium (Ba) belong?

a
Group 56, Period 137
b
Group 6, Period 2
c
Grroup 137, Period 56
d
Group 2, Period 6
Question 8
Atoms and molecules are constantly in motion. The more kinetic energy atoms or molecules have, the faster they move about. In which state of matter do the atoms and molecules have the least kinetic energy?

a
gas
b
solid
c
liquid
d
not enough information to determine
Question 9
What is the difference between speed and velocity?

a
Velocity has direction.
b
Velocity has distance.

c
Velocity has weight.

d
Velocity has time.
Question 10
Look at the following equation.

Fe + Cl2 → FeCl3

In order to follow the law of conservation of mass, this equation must have which set of coefficients, in order from left to right?

Blank 1:
Blank 2:
Blank 3:
Question 11
The graph shows the motion of a squirrel that leaves its nest to find food.

Which segment of the graph represents the squirrel heading toward its nest?

a
Q
b
R
c
T
d
S
Question 12
What is the difference between a vector and a scalar?

a
A vector is only used in measuring forces, a scalar is only used in measuring mass
b
A vector measurement contains a direction and magnitude, a scalar measurement only contains a magnitude
c
A vector is only measured in SI units, where scalars are only measured in US Customary units
d
A vector measurement is required for distance, a scalar measurement is required for displacement
Question 13
What kind of nuclear reaction does the picture show?



a
Nuclear Fission
b
Nuclear Fusion
Question 14
Classify each change listed below as either a chemical or physical change in matter.

Column A
1.
Liquid water boiling and becoming steam:
Liquid water boiling and becoming steam
2.
Silver metal tarnishing and becoming silver sulfide.:
Silver metal tarnishing and becoming silver sulfide.
3.
Paper burning:
Paper burning
4.
Bending copper wire:
Bending copper wire
5.
Dissloving salt in water:
Dissloving salt in water
6.
Iron rusting to become iron oxide.:
Iron rusting to become iron oxide.
Column B
a.Physical Change
b.Chemical Change
Question 15
Which of the following diagrams represents a box in equilibrium?

a

b

c

d

Question 16
What would happen if a scuba tank (a rigid, sealed gas cylinder) heats up?

a
The density of the gas in the tank would increase.
b
The number of particles in the tank would increase.
c
The size of the gas particles in the tank would increase.
d
The pressure exerted by the gas in the tank would increase.
Question 17
An atom of an element can change into an atom of another element if it is:

a
extremely stable
b
radioactive and it's nucleus can trap or emit particles
c
an ion and it's atomic number is larger than it's mass number
d
an isotope and it has more electrons than neutrons
Question 18
Use the pictures below to answer these questions:

How does Magnesium become an ion? What is the charge of the Magnesium ion?



a
The magnesium atom gained two electrons. The ion has a negative two charge.
b
The magnesium atom lost two electrons. The ion has a negative two charge.
c
The magnesium atom lost two electrons. The ion has a positive two charge.
d
The magnesium atom gained two electrons. The ion has a positive two charge.
Question 19
If a dolphin swims at 1.85 m/s, how far will the dolphin have traveled after 6.0 s?

a
11 m
b
3.2 m
c
31 m
d
9.0 m
Question 20

In the element above the mass number is and the atomic number is .

Blank 1:
Blank 2:
Question 21
Determine whether the statement is true or false.
The picture chemical reaction is balanced:

True
False
Question 22
Sodium undergoes beta decay. Match the missing parts (A, B, and C) of the nuclear equation above to their correct number or symbol:

Column A
1.
A:
A
2.
B:
B
3.
C:
C
Column B
a.Mg
b.24
c.12
d.23
e.25
f.Ne
g.10
Question 23
For each description, decide if it is describing an acid or a base.

Column A
1.
Tastes sour.:
Tastes sour.
2.
Tastes bitter:
Tastes bitter
3.
H2SO4

:
H2SO4

4.
LiOH:
LiOH
5.
pH above 7:
pH above 7
6.
pH below 7:
pH below 7
Column B
a.Acid
b.Base
Question 24
A reaction that produces heat is an endothermic reaction.

True
False
Question 25
Match each letter with the correct part of the atom.

Column A
1.
A:
A
2.
B:
B
3.
C:
C
4.
D:
D
5.
E:
E
Column B
a.Nucleus
b.Electron cloud
c.Neutron
d.Electron
e.Proton
Question 26
The table shows the times it took different animals to cover various distances.

MOTION OF ANIMALS
Animals Distance (km) Time (h)
Gray fox 73 1.05
Gazelle 68 0.85
Rabbit 70 1.25
Cheetah 85 0.75
Giraffe 60 1.15
Antelope 93 0.95


Which animal's speed is the greatest?

a
cheetah
b
rabbit
c
gazelle
d
gray fox
Question 27
Match the solution to its description using the following diagram:

Column A
1.
20g of NaCl at 50°C:
20g of NaCl at 50°C
2.
45g KCl at 60°C:
45g KCl at 60°C
3.
70g of CaCl2 at 10°C:
70g of CaCl2 at 10°C
Column B
a.saturated
b.unsaturated
c.supersaturated
Question 28
What happens to the volume of a gas when the temperature is increased?

a
The volume is decreased
b
The volume is increased
c
The volume stays the same
Question 29
The picture below shows Jamal pushing with a 100-Newton (N) force on a large box. Neither Jamal nor the box move when he pushes on it.

What force is the box applying on Jamal?

a
a 60 N force in the opposite direction that Jamal is pushing it
b
a 20 N force in the opposite direction that Jamal is pushing it
c
a 0 N force in the opposite direction that Jamal is pushing it

d
a 100 N force in the opposite direction that Jamal is pushing it
Question 30
An object starts moving from point A and continues along a straight path from A to point D.

If the object starts moving from point A and continues along a straight path from point A to point D, which of the following is true?

a
In the interval from point C to point D, the object travels 0 m.
b
In the interval from point B to point C, the object travels 30 m.
c
In the interval from point A to point B, the object travels 30 m.
d
In the interval from point A to point D, the object travels 11 m.
Question 31
Which scenario best demonstrates an example of Newton's first law of motion?

a
A rocket lifts off from a launch pad.
b
A man pushes a canoe off the shore and into the water.
c
A shopping cart accelerates when it is pushed.
d
A car passenger moves forward when a car suddenly stops.
Question 32
Americium-241 is a radioactive substance used in smoke detectors. The half life of americium is 432 years. If a smoke detector initially contains 1 gram of Americium 241, how much will remain in 1,296 years?

a
0.5 g
b
0.25 g
c
1.0 g
d
0.125 g
Question 33
According to Newton's second law, what happens when the same force is applied to two objects of different masses?

a
The object with greater mass will experience a smaller acceleration.
b
The object with greater mass will experience a greater acceleration.
c
The two objects experience the same acceleration.
d
The object with smaller mass will experience a smaller acceleration.
Question 34
Match the description of nuclear decay to the type of nuclear decay.

Column A
1.


:


2.


:


3.


:


4.
Can be stopped by paper:
Can be stopped by paper
5.
Can be stopped by aluminum:
Can be stopped by aluminum
6.
Can be stopped by lead:
Can be stopped by lead
Column B
a.Gamma
b.Alpha
c.Beta
Question 35
Match the missing coefficient to the correct number of molecules so that the equation adheres to the conservation of mass.

(X)N2 + (Y)H2 → (Z)NH3

Column A
1.
X:
X
2.
Y:
Y
3.
Z:
Z
Column B
a.1
b.2
c.3
Question 36
A box is initially at rest on a surface. It then experiences two forces, as shown in the picture.

Which best describes what will happen to the box?

a
It will move to the right.
b
It will remain at rest.
c
It will move to the left.
Question 37
A chemist is trying to get two substances to react, but he is unsuccessful. He knows that the two substances should react with one another. Which of the following could he do to possibly get the substances to react? (Select all that apply)

a
heat the substances
b
increase the concentration of one of the substances
c
crush up one of the substances
d
cool the substances
e
decrease the concentration of one of the substances
Question 38
The table shows the acceleration due to gravity on four different planets. What planet is a person standing on if the person has a mass of 35.0 kg and weighs 343 N?

a
Mercury
b
Venus
c
Mars
d
Earth
Question 39
An object moves a distance of 10 meters in 5 seconds. What is the average speed of the object?

a
50 m/s
b
0.5 m/s
c
2.0 m/s
d
40 m/s
Question 40
What two subatomic particles have the greatest mass?

a
protons and neutrons
b
neutrons and electrons
c
protons and electrons

Answer 1

Here are the answers to the questions:

Question 1: c - Yes, because the mass of the reactants is the same as the mass of the products in her data.

Question 2: a - Nitrogen-16

Question 3: (without the arrows image, I can provide general knowledge) 1 - a (if L is deposition) 2 - b (if M is vaporization) 3 - c (if N is freezing) 4 - d (if O is melting) 5 - e (if P is condensation) 6 - f (if Q is sublimation)

Question 4: 1 - e (Silver (Ag) is a Transition Metal) 2 - c (Barium (Ba) is an Alkaline Earth Metal) 3 - d (Iodine (I) is a Halogen) 4 - a (Argon (Ar) is a Noble Gas) 5 - b (Potassium (K) is an Alkali Metal)

Question 5: 1 - b (Na + Cl → NaCl) 2 - a (2 NaCl + Br2 → 2 NaBr + Cl2) 3 - e (C3H8 + 5 O2 → 3 CO2 + 4 H2O) 4 - d (MgBr2 + 2 NaCl → MgCl2 + 2 NaBr) 5 - c (2 H2O → 2 H2 + O2)

Question 6: a - 7 half-lives

Question 7: d - Group 2, Period 6

Question 8: b - solid

Question 9: a - Velocity has direction.

Question 10: (requires balancing the equation) 1: 2 2: 3 3: 2

Question 11: (without the graph image)

• I cannot determine the correct answer without a graph image.

Question 12: b - A vector measurement contains a direction and magnitude, a scalar measurement only contains a magnitude.

Question 13: a - Nuclear Fission

Question 14: 1 - a (Physical Change) 2 - b (Chemical Change) 3 - b (Chemical Change) 4 - a (Physical Change) 5 - a (Physical Change) 6 - b (Chemical Change)

Question 15: (without the diagrams)

• I cannot determine the correct answer without seeing the diagrams.

Question 16: d - The pressure exerted by the gas in the tank would increase.

Question 17: b - radioactive and its nucleus can trap or emit particles

Question 18: c - The magnesium atom lost two electrons. The ion has a positive two charge.

Question 19: c - 11 m (1.85 m/s × 6.0 s = 11.1 m)

Question 20: (depends on the element)

• Provide mass and atomic number.

Question 21:

• I cannot determine the answer without the image of the reaction.

Question 22: (needs the equation)

• I cannot provide an answer without the actual nuclear equation.

Question 23: 1 - a (Acid) 2 - b (Base) 3 - a (Acid) 4 - b (Base) 5 - b (Base) 6 - a (Acid)

Question 24: False

Question 25: (without the pictures)

• I cannot provide an answer without seeing the diagrams.

Question 26: a - cheetah (highest speed calculation)

Question 27: (without images or descriptions)

• I cannot provide an answer without details.

Question 28: b - The volume is increased

Question 29: d - a 100 N force in the opposite direction that Jamal is pushing it

Question 30: (depends on the graph)

• I cannot determine the correct answer without the graph.

Question 31: d - A car passenger moves forward when a car suddenly stops.

Question 32: b - 0.125 g (1 g → 0.5 g → 0.25 g → 0.125 g after 3 half-lives)

Question 33: a - The object with greater mass will experience a smaller acceleration.

Question 34: 1 - b (Alpha) 2 - c (Beta) 3 - a (Gamma) 4 - b (Alpha) 5 - c (Beta) 6 - a (Gamma)

Question 35: 1 - a (1) 2 - b (3) 3 - c (2)

Question 36: a - It will move to the right. (if right force is greater)

Question 37: (Select all that apply) a, b, c

Question 38: d - Earth (g = 9.8 m/s²; 35 kg x 9.8 m/s² = 343 N)

Question 39: c - 2.0 m/s (10 m / 5 s = 2 m/s)

Question 40: a - protons and neutrons

Make sure to double-check the answers where images or detailed contextual information is required for clearer responses!

Answer 2

question 10 equation:_____Fe+_____Cl2-->_____FeCl3

Answer 3

To balance the equation \( \text{Fe} + \text{Cl}_2 \rightarrow \text{FeCl}_3 \), you need to ensure that the number of each type of atom is the same on both sides of the equation.

The balanced equation is:

\[ 2\text{Fe} + 3\text{Cl}_2 \rightarrow 2\text{FeCl}_3 \]

So the coefficients from left to right would be:

• Blank 1: 2 (for Fe)
• Blank 2: 3 (for Cl2)
• Blank 3: 2 (for FeCl3)

Thus, the complete setup is:

Blank 1: 2
Blank 2: 3
Blank 3: 2

Answer 4

question 20 picture:63/29 Cu

Answer 5

In the notation \( \frac{63}{29}\text{Cu} \), the number on the top (63) is the mass number, and the number on the bottom (29) is the atomic number.

• Mass number: 63
• Atomic number: 29

So, the answers for Question 20 would be:

Blank 1 (mass number): 63
Blank 2 (atomic number): 29

Answer 6

Question 22 equation:
24
Na---->0 A
e + C
11 -1 B

Answer 7

In the given equation for the beta decay of sodium-24 (\(^{24}_{11}\text{Na}\)), we can fill in the missing parts as follows:

The general form for a beta decay reaction can be expressed as:

\[ ^{A}{Z}\text{X} \rightarrow ^{A}{Z-1}\text{Y} + e^{-} \]

In this case, sodium-24 (\(^{24}_{11}\text{Na}\)) undergoes beta decay to form another element (element Y, in this case) and an electron (\(e^{-}\)), which is represented by (C).

Here is how we can fill in the blanks:

• A: This is the element formed after beta decay. Since sodium-24 undergoes beta decay to form magnesium-24, the value of A (the new element) will be magnesium (Mg), which has an atomic number of 12. So:

  • A = Mg (since Z increases by 1)

• B: This is the symbol for the electron emitted in beta decay, which is correctly identified as \(e^{-}\).

• C: To find C, we need to identify the mass number of the product. The mass number remains the same after beta decay, so it will still be 24:

  • C = 24

Thus, the completed nuclear equation is:

\[ ^{24}{11}\text{Na} \rightarrow ^{24}{12}\text{Mg} + e^{-} \]

Filling in the missing parts:

• A = Mg (12)
• B = \(e^{-}\)
• C = 24

So, your final answers are:

• A: Mg
• B: \(e^{-}\)
• C: 24

Answer 8

question 34:
1._____
4/2 He
2._____
0/-1 e
3._____
0/0 Y
4.____can be stopped by paper
5.____can be stopped by aluminum
6.____can be stopped by lead

Answer 9

For Question 34, we need to match the description of nuclear decay to the corresponding types of decay. Here’s a breakdown based on the symbols you provided:

1. 4/2 He: This represents an alpha particle.
2. 0/-1 e: This represents a beta particle (specifically, it’s a beta minus decay).
3. 0/0 Y: This represents a gamma ray.
4. Can be stopped by paper: This refers to alpha decay.
5. Can be stopped by aluminum: This refers to beta decay.
6. Can be stopped by lead: This refers to gamma decay.

Let's fill in the matches:

1. Alpha decay (4/2 He)
2. Beta decay (0/-1 e)
3. Gamma decay (0/0 Y)
4. Alpha decay (can be stopped by paper)
5. Beta decay (can be stopped by aluminum)
6. Gamma decay (can be stopped by lead)

Therefore, the matches would be:

1. b (Alpha)
2. c (Beta)
3. a (Gamma)
4. Alpha can be stopped by paper
5. Beta can be stopped by aluminum
6. Gamma can be stopped by lead