his is a model of a compound called propane. Its chemical formula is C3
H8
Question
Think about what the letters and numbers in the chemical formula for propane must mean. Label each item shown in the diagram.
Drag and drop the words into the correct boxes to label the diagram.
(3 points)
b. Which of the following pieces of evidence helped Dalton and Macie answer question a?(2 points)
evidence that was useful to Dalton and Macie evidence that was not observed or was not useful
A new gas was formed.
evidence that was useful to Dalton and Macie – A new gas was formed.
evidence that was not observed or was not useful – A new gas was formed.
A solid dissolved in a liquid.
evidence that was useful to Dalton and Macie – A solid dissolved in a liquid.
evidence that was not observed or was not useful – A solid dissolved in a liquid.
They saw a new color.
evidence that was useful to Dalton and Macie – They saw a new color.
evidence that was not observed or was not useful – They saw a new color.
One of the substances formed had a new property.
i need all the answers
I apologize for the confusion. Here are the answers:
a. Dalton and Macie determine that a chemical reaction must have taken place. When this kind of change occurs, atoms must rearrange.
b. The evidence that was useful to Dalton and Macie in answering question a is that one of the substances formed had a new property.
no all them for part b
what about One of the substances formed had a new property.
I apologize for the omission. The evidence that was useful to Dalton and Macie in answering question a is that one of the substances formed had a new property.
- C3H8: Chemical formula
- C: Symbol for carbon
- H: Symbol for hydrogen
- 3: Subscript indicating the number of carbon atoms in the compound
- 8: Subscript indicating the number of hydrogen atoms in the compound
Think about what the letters and numbers in the chemical formula for propane must mean. Label each item shown in the diagram.
bond, oxygen, hydrogen, carbon
In the given diagram of propane, there is no mention or representation of an oxygen atom or a bond. However, based on the information provided:
- Carbon: Represents the carbon atoms in propane (C3).
- Hydrogen: Represents the hydrogen atoms in propane (H8).
but there has to be 3
Apologies for the confusion. If the compound is propane (C3H8), then I assume you are referring to a model that explicitly shows all the atoms and bonds.
- Carbon (C): There should be three carbon atoms in the molecule. Label each individual carbon atom as C.
- Hydrogen (H): There should be eight hydrogen atoms in the molecule. Label each individual hydrogen atom as H.
These labels demonstrate the distribution of carbon and hydrogen atoms within the propane molecule.
Study the models shown in the picture. The models were all made using the same model kit. The methane model and the oxygen model are both complete and correct. In the hydrogen peroxide model, one atom is incorrectly represented with a blue sphere.
a. Think about the models shown above. What colors are used to represent the different elements?
(3 points)
The white spheres represent
atoms. The red spheres represent
atoms. The grey spheres represent
atoms.
Question 2
Keep thinking about the models shown above, and consider which elements are represented by which colors.
b. What color should the blue atom actually be?
(1 point)
Responses
white
white
black
black
red
red
grey
a. The white spheres represent hydrogen atoms. The red spheres represent oxygen atoms. The grey spheres represent carbon atoms.
b. The blue atom should actually be represented by a black sphere.
Consider these entries from the periodic table of elements.
a. What is the chemical symbol for lithium?
(1 point)
Responses
lithium
lithium
LI (big L, big I)
LI (big L, big I)
Li (big L, little i)
Li (big L, little i)
L
L
Question 2
b. How many protons does one atom of sulfur have?(1 point)
Responses
8
8
16
16
32
32
32.066
32.066
Question 3
c. What is the atomic number of oxygen?(1 point)
Responses
3
3
8
8
16
16
16.00
a. The chemical symbol for lithium is Li (big L, little i).
b. One atom of sulfur has 16 protons.
c. The atomic number of oxygen is 8.
Dalton and Macie were conducting an experiment at school. During the experiment, they added a little dry yeast to some hydrogen peroxide. The combination began to bubble rapidly, and the container felt warm. They captured some of the gas that was formed, and they discovered that the gas they captured had a new property. When they put a lit match into the gas, it made the lit match glow much brighter!(2 points)
a. Dalton and Macie determine that a
must have taken place. When this kind of change takes place, atoms must
.
Question 2
b. Which of the following pieces of evidence helped Dalton and Macie answer question a?(2 points)
evidence that was useful to Dalton and Macie evidence that was not observed or was not useful
A new gas was formed.
evidence that was useful to Dalton and Macie – A new gas was formed.
evidence that was not observed or was not useful – A new gas was formed.
A solid dissolved in a liquid.
evidence that was useful to Dalton and Macie – A solid dissolved in a liquid.
evidence that was not observed or was not useful – A solid dissolved in a liquid.
They saw a new color.
evidence that was useful to Dalton and Macie – They saw a new color.
evidence that was not observed or was not useful – They saw a new color.
One of the substances formed had a new property.
evidence that was useful to Dalton and Macie – One of the substances formed had a new property.
evidence that was not observed or was not useful – One of the substances formed had a new property.
a. Dalton and Macie determine that a chemical reaction must have taken place. When this kind of change takes place, atoms must rearrange.
b. The evidence that was useful to Dalton and Macie in answering question a is that one of the substances formed had a new property.
Methane reacts with oxygen gas to form carbon dioxide and water.
a. Methane is flammable, but carbon dioxide is not. Does this make sense? Why or why not.
(1 point)
Responses
No, it doesn't make sense, because a physical change took place.
No, it doesn't make sense, because a physical change took place.
No, it doesn't make sense, because we expect products and reactants to have different properties.
No, it doesn't make sense, because we expect products and reactants to have different properties.
Yes, it makes sense, because a physical change took place.
Yes, it makes sense, because a physical change took place.
Yes, it makes sense, because we expect products and reactants to have different properties.
Yes, it makes sense, because we expect products and reactants to have different properties.
Question 2
b. How would you expect the boiling point of methane to compare with the boiling point of water?(1 point)
Responses
The boiling points would probably be the same, because products and reactants always have the same properties.
The boiling points would probably be the same, because products and reactants always have the same properties.
The boiling points would probably be different, because products and reactants usually have different properties.
The boiling points would probably be different, because products and reactants usually have different properties.
It is impossible to tell, because chemical reactions don't give us any clues about the properties of products compared to reactants.
a. No, it doesn't make sense that methane is flammable, but carbon dioxide is not because we expect products and reactants to have different properties.
b. The boiling points of methane and water would probably be different because products and reactants usually have different properties.
Connie and Dewayne know that solid potassium reacts very strongly with water, producing a chemical called potassium hydroxide along with hydrogen gas. They know the chemical equation looks like this.
2K + 2H2
O → 2KOH + some amount of H2
a. There are 4 atoms of hydrogen shown on the reactant side. How many total atoms of hydrogen must be on the product side?
(1 point)
Responses
2
2
4
4
6
6
8
8
Question 2
b. What does the law of conservation of matter (or the law of conservation of mass) tell the students?(1 point)
Responses
Matter might be lost in a chemical or physical process.
Matter might be lost in a chemical or physical process.
Matter is never gained or lost in a chemical or physical process.
Matter is never gained or lost in a chemical or physical process.
Matter might be gained in a chemical or physical process.
Matter might be gained in a chemical or physical process.
Matter is always gained or lost in a chemical or physical process.
Matter is always gained or lost in a chemical or physical process.
Question 3
c. Connie and Dewayne combine 78 grams of potassium with 36 grams of water. What would they expect the total mass of the products to be? Why?
You can use the calculator (below the answers) if desired.
(1 point)
Responses
The total mass of the products would be something less than 114 grams, because some of the mass burned into nothing.
The total mass of the products would be something less than 114 grams, because some of the mass burned into nothing.
The total mass of the products would equal 78 grams, because the mass of water doesn't make a difference.
The total mass of the products would equal 78 grams, because the mass of water doesn't make a difference.
The total mass of the products would be 114 grams, because mass cannot be gained or lost in the process.
The total mass of the products would be 114 grams, because mass cannot be gained or lost in the process.
The total mass of the products would be greater than 114 grams, because water is really heavy.
a. The total number of atoms of hydrogen on the product side must be 4.
b. The law of conservation of matter (or mass) tells the students that matter is never gained or lost in a chemical or physical process.
c. The total mass of the products would be 114 grams because mass cannot be gained or lost in the chemical reaction according to the law of conservation of matter.
Adi and Emeril were discussing articles they had read online. They summarized the articles and then talked about what the articles meant.
Adi read an article entitled, "The Wonderful World of Synthetic Chemistry." Emeril read an article entitled, "The Dangerous World of Synthetic Chemistry."
Read the portions of the articles (below) that Adi and Emeril had read. Then answer the questions.
The Wonderful World of Synthetic Chemistry
Synthetic chemistry involves producing new substances from existing raw materials. Often, the raw materials come from petroleum products like oil and natural gas, which have to be removed from deep underground. Then those molecules are used as starting materials to form new, useful molecules for things like plastics and medicines. Synthetic chemicals can be applied to clothing and household goods to make them resistant to burning. Synthetic clothing can be produced inexpensively and in a wide variety of styles. Plastic containers are lightweight and easy to transport.
The Dangerous World of Synthetic Chemistry
Synthetic materials are produced when raw materials undergo chemical reactions. Synthetic chemistry involves drilling for oil or liquid petroleum to use as raw materials. This process can lead to environmental pollution and risks to human health. Synthetic plastics are "forever" items, meaning it can take them hundreds or even thousands of years to break down in the environment. Recycling programs are not reliable, and single-use synthetic products are wasteful. Some synthetic chemicals are poisonous and can seep into groundwater.
Question 1
Adi and Emeril decide they want to interview the authors of the articles to see if the authors agreed on any topics.
a. The authors agreed on one point. They disagreed on the rest of the ideas. Click to show which points were believed by each author.
If both authors were likely to believe a statement, click BOTH options. If only one author was likely to believe a statement, just select that one author.
(4 points)
believed by the author of The Wonderful World of Synthetic Chemistry believed by the author of The Dangerous World of Synthetic Chemistry
Synthetic products are made from natural resources like petroleum (oil).
believed by the author of The Wonderful World of Synthetic Chemistry – Synthetic products are made from natural resources like petroleum (oil).
believed by the author of The Dangerous World of Synthetic Chemistry – Synthetic products are made from natural resources like petroleum (oil).
Synthetic products like plastic seat belt parts can help save people from death or injury.
believed by the author of The Wonderful World of Synthetic Chemistry – Synthetic products like plastic seat belt parts can help save people from death or injury.
believed by the author of The Dangerous World of Synthetic Chemistry – Synthetic products like plastic seat belt parts can help save people from death or injury.
Synthetic products damage the environment because they take a long time to decompose.
believed by the author of The Wonderful World of Synthetic Chemistry – Synthetic products damage the environment because they take a long time to decompose.
believed by the author of The Dangerous World of Synthetic Chemistry – Synthetic products damage the environment because they take a long time to decompose.
Synthetic products can make it easier and cheaper to package and ship other products.
believed by the author of The Wonderful World of Synthetic Chemistry – Synthetic products can make it easier and cheaper to package and ship other products.
believed by the author of The Dangerous World of Synthetic Chemistry – Synthetic products can make it easier and cheaper to package and ship other products.
Question 2
b. What gives you a good clue that chemical reactions are used to convert natural resources into synthetic products?
(1 point)
Responses
Synthetic materials and natural resources don't have any properties.
Synthetic materials and natural resources don't have any properties.
It's impossible to compare and contrast the properties of synthetic and natural materials.
It's impossible to compare and contrast the properties of synthetic and natural materials.
The properties of synthetic materials and the natural resources used to make them are different.
The properties of synthetic materials and the natural resources used to make them are different.
The properties of synthetic materials and the natural resources used to make them are the same.
The properties of synthetic materials and the natural resources used to make them are the same.
Question 3
c. Drag and drop each item into the correct column in order to sort the synthetic materials vs. the natural materials.
(2 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.
synthetic materials natural materials
a. The authors agreed on the following point:
- Synthetic products are made from natural resources like petroleum (oil).
The author of "The Wonderful World of Synthetic Chemistry" also believed:
- Synthetic products like plastic seat belt parts can help save people from death or injury.
- Synthetic products damage the environment because they take a long time to decompose.
- Synthetic products can make it easier and cheaper to package and ship other products.
The author of "The Dangerous World of Synthetic Chemistry" also believed:
- Synthetic products damage the environment because they take a long time to decompose.
- Synthetic products can make it easier and cheaper to package and ship other products.
b. The fact that synthetic materials and natural resources have different properties gives a good clue that chemical reactions are used to convert natural resources into synthetic products.
c. Sorting the materials:
Synthetic materials: plastics, synthetic chemicals, synthetic clothing, plastic containers
Natural materials: oil, natural gas
Drag and drop each item into the correct column in order to sort the synthetic materials vs. the natural materials.
(2 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.
synthetic materials natural materials
Apologies for the confusion since I cannot see the options you have provided for sorting the materials. Could you please provide the items you want to be sorted into the columns?
Drag and drop each item into the correct column in order to sort the synthetic materials vs. the natural materials.
(2 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.
synthetic materials natural materials
Plastic
Raw milk
Iphone screen protector
Strawberries
Water in the lake
Television screen
Call in the ground
I apologize for the confusion, but as an AI text-based model, I am unable to perform drag and drop actions. However, I can help you sort the items into the correct columns.
Synthetic materials:
- Plastic
- Iphone screen protector
- Television screen
Natural materials:
- Raw milk
- Strawberries
- Water in the lake
- Call in the ground
Please note that some items may be subjective in terms of classification as synthetic or natural, as it depends on the specific context or processing involved.
Nylon raincoat
The item "Nylon raincoat" would be classified as a synthetic material.
Fill in the blanks to complete the following description.
(3 points)
This reaction gives off thermal energy, so we say it is
. If you could safely put your hand near the container as soon as it was safe to do so after the reaction had finished, you would expect the surroundings to feel
. You would expect the ending temperature to be
20 degrees Celsius.
starting temperature ending temperature
20o
C ?
Fill in the blanks to complete the following description.
(3 points)
This reaction gives off thermal energy, so we say it is
. If you could safely put your hand near the container as soon as it was safe to do so after the reaction had finished, you would expect the surroundings to feel
. You would expect the ending temperature to be
20 degrees Celsius.
Apologies for the confusion.
The evidence that was useful to Dalton and Macie in answering question a is that one of the substances formed had a new property.
Apologies for the misunderstanding. Here are the answers for part b:
The evidence that was useful to Dalton and Macie in answering question a is:
- A new gas was formed.
The evidence that was not observed or was not useful is:
- A solid dissolved in a liquid.
- They saw a new color.