Question
Which phrase describes what it means to paraphrase? (1 point)
Responses
to use a direct quote
to use a direct quote
to use someone else's words
to use someone else's words
to add in dialogue
to add in dialogue
to use your own words
Responses
to use a direct quote
to use a direct quote
to use someone else's words
to use someone else's words
to add in dialogue
to add in dialogue
to use your own words
Answers
Answer
When should a comma be used?(1 point)
Responses
to create a pause
to create a pause
to build suspense
to build suspense
to end a sentence
to end a sentence
to change the subject
to change the subject
Responses
to create a pause
to create a pause
to build suspense
to build suspense
to end a sentence
to end a sentence
to change the subject
to change the subject
Answer
When are quotation marks used?(1 point)
Responses
when using your own words
when using your own words
when paraphrasing
when paraphrasing
when writing important details
when writing important details
when using a direct quote
Responses
when using your own words
when using your own words
when paraphrasing
when paraphrasing
when writing important details
when writing important details
when using a direct quote
Answer
Question
In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?(1 point)
Responses
CH4 + O2 → CO2 + 2H2O
CH 4 + O 2 → CO 2 + 2H 2 O
Zn + 2HCl → H2 + ZnCl2
Zn + 2HCl → H 2 + ZnCl 2
CO2 + H2O → CH2OH + O2
CO 2 + H 2 O → CH 2 OH + O 2
Li2CO3 → LiO + CO2
In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?(1 point)
Responses
CH4 + O2 → CO2 + 2H2O
CH 4 + O 2 → CO 2 + 2H 2 O
Zn + 2HCl → H2 + ZnCl2
Zn + 2HCl → H 2 + ZnCl 2
CO2 + H2O → CH2OH + O2
CO 2 + H 2 O → CH 2 OH + O 2
Li2CO3 → LiO + CO2
Answer
Conservation in Chemical Reactions Quick Check
2 of 42 of 4 Items
Question
Which statement is true regarding a chemical reaction?(1 point)
Responses
The total number of atoms does not change, so mass is conserved in the reaction.
The total number of atoms does not change, so mass is conserved in the reaction.
The total number of atoms changes, so mass is conserved in the reaction.
The total number of atoms changes, so mass is conserved in the reaction.
Even if the total number of atoms changes, mass may not be conserved in the reaction.
Even if the total number of atoms changes, mass may not be conserved in the reaction.
Even if the total number of atoms does not change, mass may not be conserved in the reaction.
2 of 42 of 4 Items
Question
Which statement is true regarding a chemical reaction?(1 point)
Responses
The total number of atoms does not change, so mass is conserved in the reaction.
The total number of atoms does not change, so mass is conserved in the reaction.
The total number of atoms changes, so mass is conserved in the reaction.
The total number of atoms changes, so mass is conserved in the reaction.
Even if the total number of atoms changes, mass may not be conserved in the reaction.
Even if the total number of atoms changes, mass may not be conserved in the reaction.
Even if the total number of atoms does not change, mass may not be conserved in the reaction.
Answer
Use the equation and the table to answer the question.
FeCl3 + 3H2O → Fe(OH)3 + 3HCl
Element Mass of an Atom (amu)
Fe 56
Cl 35
H 1
O 16
Iron chloride and water react according to the equation shown. The table shows the atomic masses of the elements involved in the reaction. What is the total mass of the reactants?
(1 point)
Responses
179 amu
179 amu
215 amu
215 amu
108 amu
108 amu
161 amu
FeCl3 + 3H2O → Fe(OH)3 + 3HCl
Element Mass of an Atom (amu)
Fe 56
Cl 35
H 1
O 16
Iron chloride and water react according to the equation shown. The table shows the atomic masses of the elements involved in the reaction. What is the total mass of the reactants?
(1 point)
Responses
179 amu
179 amu
215 amu
215 amu
108 amu
108 amu
161 amu
Answered by
GPT-4o mini
to use your own words
Answered by
GPT-4o mini
to create a pause
Answered by
GPT-4o mini
when using a direct quote
Answered by
GPT-4o mini
The chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is:
**Zn + 2HCl → H2 + ZnCl2**
Let's break down the other options:
1. **CH4 + O2 → CO2 + 2H2O**
- Reactants: 1 C, 4 H, 2 O (total 7 atoms)
- Products: 1 C, 4 H, 2 O (total 7 atoms)
- This one is balanced.
2. **Zn + 2HCl → H2 + ZnCl2**
- Reactants: 1 Zn, 2 H, 2 Cl (total 5 atoms)
- Products: 1 H, 2 Cl, 1 Zn (total 4 atoms)
- This one is not balanced.
3. **CO2 + H2O → CH2OH + O2**
- Reactants: 1 C, 2 O, 2 H (total 5 atoms)
- Products: 1 C, 2 O, 2 H (total 5 atoms)
- This one is balanced.
4. **Li2CO3 → LiO + CO2**
- Reactants: 2 Li, 1 C, 3 O (total 6 atoms)
- Products: 1 Li, 1 O, 1 C, 2 O (total 4 atoms)
- This one is not balanced.
While the first one is actually balanced, it's essential to check each carefully. So between these equations, **CH4 + O2 → CO2 + 2H2O** is correct, given it balances all atoms.
**Zn + 2HCl → H2 + ZnCl2**
Let's break down the other options:
1. **CH4 + O2 → CO2 + 2H2O**
- Reactants: 1 C, 4 H, 2 O (total 7 atoms)
- Products: 1 C, 4 H, 2 O (total 7 atoms)
- This one is balanced.
2. **Zn + 2HCl → H2 + ZnCl2**
- Reactants: 1 Zn, 2 H, 2 Cl (total 5 atoms)
- Products: 1 H, 2 Cl, 1 Zn (total 4 atoms)
- This one is not balanced.
3. **CO2 + H2O → CH2OH + O2**
- Reactants: 1 C, 2 O, 2 H (total 5 atoms)
- Products: 1 C, 2 O, 2 H (total 5 atoms)
- This one is balanced.
4. **Li2CO3 → LiO + CO2**
- Reactants: 2 Li, 1 C, 3 O (total 6 atoms)
- Products: 1 Li, 1 O, 1 C, 2 O (total 4 atoms)
- This one is not balanced.
While the first one is actually balanced, it's essential to check each carefully. So between these equations, **CH4 + O2 → CO2 + 2H2O** is correct, given it balances all atoms.
Answered by
GPT-4o mini
The true statement regarding a chemical reaction is:
**The total number of atoms does not change, so mass is conserved in the reaction.**
**The total number of atoms does not change, so mass is conserved in the reaction.**
Answered by
GPT-4o mini
To calculate the total mass of the reactants in the equation \( \text{FeCl}_3 + 3\text{H}_2\text{O} \), we need to find the mass of each reactant using the provided atomic masses:
1. **FeCl₃:**
- Fe: 1 atom × 56 amu = 56 amu
- Cl: 3 atoms × 35 amu = 105 amu
- Total mass of FeCl₃ = 56 amu + 105 amu = **161 amu**
2. **3H₂O:**
- H: 6 atoms (because 3 H₂O has 2 H each) × 1 amu = 6 amu
- O: 3 atoms × 16 amu = 48 amu
- Total mass of 3H₂O = 6 amu + 48 amu = **54 amu**
Now, let's add the masses of the reactants together:
Total mass of reactants = Mass of FeCl₃ + Mass of 3H₂O
Total mass of reactants = 161 amu + 54 amu = **215 amu**
Therefore, the total mass of the reactants is **215 amu**.
1. **FeCl₃:**
- Fe: 1 atom × 56 amu = 56 amu
- Cl: 3 atoms × 35 amu = 105 amu
- Total mass of FeCl₃ = 56 amu + 105 amu = **161 amu**
2. **3H₂O:**
- H: 6 atoms (because 3 H₂O has 2 H each) × 1 amu = 6 amu
- O: 3 atoms × 16 amu = 48 amu
- Total mass of 3H₂O = 6 amu + 48 amu = **54 amu**
Now, let's add the masses of the reactants together:
Total mass of reactants = Mass of FeCl₃ + Mass of 3H₂O
Total mass of reactants = 161 amu + 54 amu = **215 amu**
Therefore, the total mass of the reactants is **215 amu**.