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bekas [8.4K]
3 years ago
15

1. Marque a alternativa que melhor explica o que aconteceu com o átomo ao longo da história.

Chemistry
2 answers:
sergey [27]3 years ago
4 0

Answer: The answer is B.

Vera_Pavlovna [14]3 years ago
3 0
The correct answer is B
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What is the density of a 32g toy car that<br> has a volume of 8cm3?<br> A. 256alcm3<br> An3
Greeley [361]

Answer:

density=mass/volume

density=32/8

density=4

8 0
3 years ago
PLEASE HELP ASAP
Lapatulllka [165]

Answer:

See explanation

Explanation:

We must first write the equation of the reaction as follows;

C3H8 + 5O2 ----> 3CO2 + 4H2O

Now;

We obtain the number of moles of C3H8 = 132.33g/44g/mol = 3 moles

So;

1 mole of C3H8 yields 3 moles of CO2

3 moles of C3H8 yields 3 × 3/1 = 9 moles of CO2

We obtain the number of moles of oxygen = 384.00 g/32 g/mol = 12 moles

So;

5 moles of oxygen yields 3 moles of CO2

12 moles of oxygen yields 12 × 3/5 = 7.2 moles of CO2

We can now decide on the limiting reactant to be C3H8

Therefore;

Mass of CO2 produced = 9 moles of CO2 × 44 g/mol = 396 g of CO2

Again;

1 moles of C3H8 yields 4 moles of water

3 moles of C3H8 yields 3 × 4/1 = 12 moles of water

Hence;

Mass of water = 12 moles of water × 18 g/mol = 216 g of water

In order to obtain the percentage yield from the reaction, we have;

b) Actual yield = 269.34 g

Theoretical yield = 396 g

Therefore;

% yield = actual yield/theoretical yield × 100/1

Substituting values

% yield = 269.34 g /396 g × 100

% yield = 68%

8 0
3 years ago
Elements with high atomic numbers tend to have _____.
makvit [3.9K]
The answer is c my friend 
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4 0
3 years ago
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Which one of the following exhibits dipole-dipole attraction between molecules?
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Answer:

Anything that has polar covalent bonds exhibit dipole-dipole attraction between molecules.

Explanation:

Since, you do not have the options, you can determine the answer by knowing that anything that has polar covalent bonds exhibit dipole-dipole attraction between molecules.

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3 years ago
A chemist is studying an unknown substance. He can break it into its elemental components only by using chemical means. Based on
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The correct option is D.

In chemistry, a pure substance refers to a matter that possesses definite and constant composition with unique chemical properties. Another word for a pure substance is chemical substance. A pure substance typically contains only one type of atom or only one type of molecule. Examples of pure substances are water, sodium chloride, gold, silver, etc. In the question given above, we are told that the unknown element can only be broken down by chemical mean, this shows that the unknown compound is a chemical compound.

7 0
3 years ago
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