Question
1 of 11 of 1 Items
Question 1
Barium is an element in group 2, period 6 of the periodic table. What does this indicate about its properties?(1 point)
Responses
It has 2 valence electrons and is a non reactive gas
It has 2 valence electrons and is a non reactive gas
It has 6 valence electrons and is soft and crumbly
It has 6 valence electrons and is soft and crumbly
It has 6 valence electrons and is a semimetal.
It has 6 valence electrons and is a semimetal.
It has 2 valence electrons and is highly reactive.
It has 2 valence electrons and is highly reactive.
Question 2
Which elements have the same number of valence electrons? Match them.
(4 points)
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Carbon
Hydrogen
Oxygen
Argon
Question 3
Match the examples below with the type of change occurring. Physical change or chemical change. Use all examples below. (8 points)
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Physical Change Chemical Change
Question 4
Vinegar and baking soda are put in a beaker together, and they undergo a chemical reaction. Look at the picture. How do you know a chemical reaction is occurring?
(1 point)
Responses
Changes shape
Changes shape
Bubbles are produced
Bubbles are produced
Changes size
Changes size
There is no chemical reaction. This is a physical change.
There is no chemical reaction. This is a physical change.
Question 5
Using the same image of the vinegar and baking soda chemical reaction... A scientist finds that the total mass after the compounds react, is less than the sum of the masses before they react. Which 2 statements explain this observation.
(1 point)
Responses
Some of the mass has escaped as a gas.
Some of the mass has escaped as a gas.
Some of the mass was destroyed during the reaction.
Some of the mass was destroyed during the reaction.
Law of conservation of mass. Mass can not be created nor destroyed.
Law of conservation of mass. Mass can not be created nor destroyed.
There is no way the mass can be different.
There is no way the mass can be different.
Question 6
How does the balanced chemical equation below demonstrate the Law of Conservation of Mass?
(1 point)
Responses
It shows that the properties of the elements stay the same after the reaction.
It shows that the properties of the elements stay the same after the reaction.
It shows that all compounds remain bonded after the reaction.
It shows that all compounds remain bonded after the reaction.
It shows that no atoms have been gained or lost during the reaction.
It shows that no atoms have been gained or lost during the reaction.
It shows that only physical changes follow the Law of Conservation of Mass.
It shows that only physical changes follow the Law of Conservation of Mass.
Question 7
How many atoms are in the equation below?
(1 point)
Responses
8
8
6
6
4
4
10
10
Question 8
Question 1
Barium is an element in group 2, period 6 of the periodic table. What does this indicate about its properties?(1 point)
Responses
It has 2 valence electrons and is a non reactive gas
It has 2 valence electrons and is a non reactive gas
It has 6 valence electrons and is soft and crumbly
It has 6 valence electrons and is soft and crumbly
It has 6 valence electrons and is a semimetal.
It has 6 valence electrons and is a semimetal.
It has 2 valence electrons and is highly reactive.
It has 2 valence electrons and is highly reactive.
Question 2
Which elements have the same number of valence electrons? Match them.
(4 points)
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Carbon
Hydrogen
Oxygen
Argon
Question 3
Match the examples below with the type of change occurring. Physical change or chemical change. Use all examples below. (8 points)
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Physical Change Chemical Change
Question 4
Vinegar and baking soda are put in a beaker together, and they undergo a chemical reaction. Look at the picture. How do you know a chemical reaction is occurring?
(1 point)
Responses
Changes shape
Changes shape
Bubbles are produced
Bubbles are produced
Changes size
Changes size
There is no chemical reaction. This is a physical change.
There is no chemical reaction. This is a physical change.
Question 5
Using the same image of the vinegar and baking soda chemical reaction... A scientist finds that the total mass after the compounds react, is less than the sum of the masses before they react. Which 2 statements explain this observation.
(1 point)
Responses
Some of the mass has escaped as a gas.
Some of the mass has escaped as a gas.
Some of the mass was destroyed during the reaction.
Some of the mass was destroyed during the reaction.
Law of conservation of mass. Mass can not be created nor destroyed.
Law of conservation of mass. Mass can not be created nor destroyed.
There is no way the mass can be different.
There is no way the mass can be different.
Question 6
How does the balanced chemical equation below demonstrate the Law of Conservation of Mass?
(1 point)
Responses
It shows that the properties of the elements stay the same after the reaction.
It shows that the properties of the elements stay the same after the reaction.
It shows that all compounds remain bonded after the reaction.
It shows that all compounds remain bonded after the reaction.
It shows that no atoms have been gained or lost during the reaction.
It shows that no atoms have been gained or lost during the reaction.
It shows that only physical changes follow the Law of Conservation of Mass.
It shows that only physical changes follow the Law of Conservation of Mass.
Question 7
How many atoms are in the equation below?
(1 point)
Responses
8
8
6
6
4
4
10
10
Question 8
Answers
Answered by
GPT-4o mini
Sure! Here are the answers to the questions you've listed:
**Question 1:**
Correct Response: **It has 2 valence electrons and is highly reactive.**
**Question 2:**
- **Carbon**: ___
- **Hydrogen**: ___
- **Oxygen**: ___
- **Argon**: ___
Match them as follows:
- Carbon - Oxygen
- Hydrogen - Argon
**Question 3:**
- **Physical Change**: (insert examples such as melting, freezing, dissolving water, etc.)
- **Chemical Change**: (insert examples such as burning wood, rusting iron, etc.)
**Question 4:**
Correct Response: **Bubbles are produced.**
**Question 5:**
Correct Responses:
- **Some of the mass has escaped as a gas.**
- **Law of conservation of mass. Mass cannot be created nor destroyed.**
**Question 6:**
Correct Response: **It shows that no atoms have been gained or lost during the reaction.**
**Question 7:**
To count the atoms in the equation, I would need to see the specific balanced equation. However, based on generic equations, if the equation is something common like \( 2H_2 + O_2 \rightarrow 2H_2O \):
Correct Response: **6** (4 H atoms and 2 O atoms).
Let me know if you need further assistance or details!
**Question 1:**
Correct Response: **It has 2 valence electrons and is highly reactive.**
**Question 2:**
- **Carbon**: ___
- **Hydrogen**: ___
- **Oxygen**: ___
- **Argon**: ___
Match them as follows:
- Carbon - Oxygen
- Hydrogen - Argon
**Question 3:**
- **Physical Change**: (insert examples such as melting, freezing, dissolving water, etc.)
- **Chemical Change**: (insert examples such as burning wood, rusting iron, etc.)
**Question 4:**
Correct Response: **Bubbles are produced.**
**Question 5:**
Correct Responses:
- **Some of the mass has escaped as a gas.**
- **Law of conservation of mass. Mass cannot be created nor destroyed.**
**Question 6:**
Correct Response: **It shows that no atoms have been gained or lost during the reaction.**
**Question 7:**
To count the atoms in the equation, I would need to see the specific balanced equation. However, based on generic equations, if the equation is something common like \( 2H_2 + O_2 \rightarrow 2H_2O \):
Correct Response: **6** (4 H atoms and 2 O atoms).
Let me know if you need further assistance or details!
There are no human answers yet. A form for humans to post answers is coming very soon!