Question
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.Chemical Change
b.Physical Change
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.Chemical Change
b.Physical Change
Answers
Answer
If a dolphin swims at 1.85 m/s, how far will the dolphin have traveled after 6.0 s?
a
11 m
b
31 m
c
3.2 m
d
9.0 m
a
11 m
b
31 m
c
3.2 m
d
9.0 m
Answer
An object moves a distance of 10 meters in 5 seconds. What is the average speed of the object?
a
2.0 m/s
b
40 m/s
c
0.5 m/s
d
50 m/s
a
2.0 m/s
b
40 m/s
c
0.5 m/s
d
50 m/s
Answer
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
cool the substances
c
decrease the concentration of one of the substances
d
crush up one of the substances
e
increase the concentration of one of the substances
a
heat the substances
b
cool the substances
c
decrease the concentration of one of the substances
d
crush up one of the substances
e
increase the concentration of one of the substances
Answer
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
Venus
b
Mars
c
Mercury
d
Earth
a
Venus
b
Mars
c
Mercury
d
Earth
Answer
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 lost two electrons. The ion has a negative two charge.
b
The magnesium atom lost two electrons. The ion has a positive two charge.
c
The magnesium atom gained two electrons. The ion has a negative two charge.
d
The magnesium atom gained two electrons. The ion has a positive two charge.
How does Magnesium become an ion? What is the charge of the Magnesium ion?
a
The magnesium atom lost two electrons. The ion has a negative two charge.
b
The magnesium atom lost two electrons. The ion has a positive two charge.
c
The magnesium atom gained two electrons. The ion has a negative two charge.
d
The magnesium atom gained two electrons. The ion has a positive two charge.
Answered by
GPT-4o mini
Here’s the classification of the changes in Column A as either a chemical change or a physical change from Column B:
1. **Liquid water boiling and becoming steam:**
**b. Physical Change**
(The substance remains H2O in different states: liquid and gas.)
2. **Silver metal tarnishing and becoming silver sulfide:**
**a. Chemical Change**
(A new substance, silver sulfide, is formed.)
3. **Paper burning:**
**a. Chemical Change**
(The paper is transformed into ash, gases, and other substances.)
4. **Bending copper wire:**
**b. Physical Change**
(The copper remains the same substance; only its shape is changed.)
5. **Dissolving salt in water:**
**b. Physical Change**
(Salt (NaCl) dissolves but can be recovered by evaporation; it is still the same substance.)
6. **Iron rusting to become iron oxide:**
**a. Chemical Change**
(Rusting involves the formation of a new substance, iron oxide.)
Summary:
- 1: b. Physical Change
- 2: a. Chemical Change
- 3: a. Chemical Change
- 4: b. Physical Change
- 5: b. Physical Change
- 6: a. Chemical Change
1. **Liquid water boiling and becoming steam:**
**b. Physical Change**
(The substance remains H2O in different states: liquid and gas.)
2. **Silver metal tarnishing and becoming silver sulfide:**
**a. Chemical Change**
(A new substance, silver sulfide, is formed.)
3. **Paper burning:**
**a. Chemical Change**
(The paper is transformed into ash, gases, and other substances.)
4. **Bending copper wire:**
**b. Physical Change**
(The copper remains the same substance; only its shape is changed.)
5. **Dissolving salt in water:**
**b. Physical Change**
(Salt (NaCl) dissolves but can be recovered by evaporation; it is still the same substance.)
6. **Iron rusting to become iron oxide:**
**a. Chemical Change**
(Rusting involves the formation of a new substance, iron oxide.)
Summary:
- 1: b. Physical Change
- 2: a. Chemical Change
- 3: a. Chemical Change
- 4: b. Physical Change
- 5: b. Physical Change
- 6: a. Chemical Change
Answered by
GPT-4o mini
To find out how far the dolphin travels, you can use the formula for distance:
\[ \text{Distance} = \text{Speed} \times \text{Time} \]
Given:
- Speed = 1.85 m/s
- Time = 6.0 s
Now, plug the values into the formula:
\[ \text{Distance} = 1.85 \, \text{m/s} \times 6.0 \, \text{s} = 11.1 \, \text{m} \]
Since 11.1 m is not an option provided, but considering rounding, it can be approximated to **11 m**.
Therefore, the correct answer is:
**a. 11 m**
\[ \text{Distance} = \text{Speed} \times \text{Time} \]
Given:
- Speed = 1.85 m/s
- Time = 6.0 s
Now, plug the values into the formula:
\[ \text{Distance} = 1.85 \, \text{m/s} \times 6.0 \, \text{s} = 11.1 \, \text{m} \]
Since 11.1 m is not an option provided, but considering rounding, it can be approximated to **11 m**.
Therefore, the correct answer is:
**a. 11 m**
Answered by
GPT-4o mini
To calculate the average speed of an object, you can use the formula:
\[ \text{Average Speed} = \frac{\text{Distance}}{\text{Time}} \]
Given:
- Distance = 10 meters
- Time = 5 seconds
Now, plug the values into the formula:
\[ \text{Average Speed} = \frac{10 \, \text{meters}}{5 \, \text{seconds}} = 2.0 \, \text{m/s} \]
Therefore, the correct answer is:
**a. 2.0 m/s**
\[ \text{Average Speed} = \frac{\text{Distance}}{\text{Time}} \]
Given:
- Distance = 10 meters
- Time = 5 seconds
Now, plug the values into the formula:
\[ \text{Average Speed} = \frac{10 \, \text{meters}}{5 \, \text{seconds}} = 2.0 \, \text{m/s} \]
Therefore, the correct answer is:
**a. 2.0 m/s**
Answered by
GPT-4o mini
To encourage a reaction between two substances that are initially unreactive, the chemist could consider the following options:
**a. heat the substances**
Heating can increase the kinetic energy of the molecules, which may lead to more frequent collisions and a higher likelihood of a reaction occurring.
**d. crush up one of the substances**
Crushing increases the surface area of a solid reactant, leading to more collisions with other reactants, which can facilitate a reaction.
**e. increase the concentration of one of the substances**
Increasing the concentration of one of the reactants increases the number of particles per unit volume, which can lead to more frequent collisions and a greater chance of reaction.
The other options are:
**b. cool the substances**
Cooling typically reduces the kinetic energy of particles, making them move slower and possibly decreasing the likelihood of a reaction.
**c. decrease the concentration of one of the substances**
Decreasing concentration reduces the number of reactive particles, which would likely decrease the chances of a reaction.
Based on the above analysis, the correct actions the chemist could take are:
- **a. heat the substances**
- **d. crush up one of the substances**
- **e. increase the concentration of one of the substances**
**a. heat the substances**
Heating can increase the kinetic energy of the molecules, which may lead to more frequent collisions and a higher likelihood of a reaction occurring.
**d. crush up one of the substances**
Crushing increases the surface area of a solid reactant, leading to more collisions with other reactants, which can facilitate a reaction.
**e. increase the concentration of one of the substances**
Increasing the concentration of one of the reactants increases the number of particles per unit volume, which can lead to more frequent collisions and a greater chance of reaction.
The other options are:
**b. cool the substances**
Cooling typically reduces the kinetic energy of particles, making them move slower and possibly decreasing the likelihood of a reaction.
**c. decrease the concentration of one of the substances**
Decreasing concentration reduces the number of reactive particles, which would likely decrease the chances of a reaction.
Based on the above analysis, the correct actions the chemist could take are:
- **a. heat the substances**
- **d. crush up one of the substances**
- **e. increase the concentration of one of the substances**
Answered by
GPT-4o mini
To find out which planet the person is standing on, we can use the formula for weight:
\[ \text{Weight} = \text{mass} \times \text{acceleration due to gravity} \]
Given that the mass of the person is 35.0 kg and their weight is 343 N, we can rearrange the formula to calculate the acceleration due to gravity on the planet:
\[ \text{acceleration due to gravity} = \frac{\text{Weight}}{\text{mass}} \]
Substituting the values:
\[ \text{acceleration due to gravity} = \frac{343 \, \text{N}}{35.0 \, \text{kg}} \]
Calculating this:
\[ \text{acceleration due to gravity} = 9.8 \, \text{m/s}^2 \]
Now, we can compare this value with the standard acceleration due to gravity on the listed planets:
1. **Earth:** ~9.8 m/s²
2. **Venus:** ~8.87 m/s²
3. **Mars:** ~3.71 m/s²
4. **Mercury:** ~3.70 m/s²
Since the calculated acceleration due to gravity (9.8 m/s²) matches the value for Earth, the person is standing on **Earth**.
Therefore, the correct answer is:
**d. Earth**
\[ \text{Weight} = \text{mass} \times \text{acceleration due to gravity} \]
Given that the mass of the person is 35.0 kg and their weight is 343 N, we can rearrange the formula to calculate the acceleration due to gravity on the planet:
\[ \text{acceleration due to gravity} = \frac{\text{Weight}}{\text{mass}} \]
Substituting the values:
\[ \text{acceleration due to gravity} = \frac{343 \, \text{N}}{35.0 \, \text{kg}} \]
Calculating this:
\[ \text{acceleration due to gravity} = 9.8 \, \text{m/s}^2 \]
Now, we can compare this value with the standard acceleration due to gravity on the listed planets:
1. **Earth:** ~9.8 m/s²
2. **Venus:** ~8.87 m/s²
3. **Mars:** ~3.71 m/s²
4. **Mercury:** ~3.70 m/s²
Since the calculated acceleration due to gravity (9.8 m/s²) matches the value for Earth, the person is standing on **Earth**.
Therefore, the correct answer is:
**d. Earth**
Answered by
GPT-4o mini
To determine how magnesium becomes an ion and its charge, let's review the characteristics of magnesium:
1. **Valence Electrons**: Magnesium (Mg) is in group 2 of the periodic table and has two valence electrons. Atoms tend to achieve a stable electron configuration by losing or gaining electrons.
2. **Formation of Ions**: When magnesium forms an ion, it loses its two valence electrons. This process results in the magnesium atom becoming a positively charged ion (cation).
3. **Charge of the Ion**: When an atom loses electrons, it becomes positively charged because it has more protons than electrons. In this case, losing two electrons gives magnesium a charge of +2.
Therefore, the correct answer is:
**b. The magnesium atom lost two electrons. The ion has a positive two charge.**
1. **Valence Electrons**: Magnesium (Mg) is in group 2 of the periodic table and has two valence electrons. Atoms tend to achieve a stable electron configuration by losing or gaining electrons.
2. **Formation of Ions**: When magnesium forms an ion, it loses its two valence electrons. This process results in the magnesium atom becoming a positively charged ion (cation).
3. **Charge of the Ion**: When an atom loses electrons, it becomes positively charged because it has more protons than electrons. In this case, losing two electrons gives magnesium a charge of +2.
Therefore, the correct answer is:
**b. The magnesium atom lost two electrons. The ion has a positive two charge.**
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