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REY [17]
3 years ago
13

Please help with chemistry question... It would help me tremendously and if you can, please show work :)?

Chemistry
1 answer:
mafiozo [28]3 years ago
7 0

Answer:

A: Volume and Amount of Gas

B: 3

C: 4

D: 4

E: 3

F: Gay-Lussac's Law

G: Directly Proportional Relationship

Explanation:

A: When looking at the information given, each container contains the same amount of particles and the size of the container is stated to be the same. Therefore, these two variables remain constant.

B: KE is determined by the temperature, which means the container with particles at the highest temperature has the highest amount of KE. This would be container 3.

C: The container with the lowest temperature is 4.

D: The container with the lowest pressure is 4 because a lower temperature means lower pressure.

E: The container with the highest temperature has the highest pressure because the particles are moving faster, meaning more pressure exerted against the container.

F: Gay Lussac's Law because this law shows the relationship between pressure and temperature.

G: This is a directly proportional relationship because as temperature increases, pressure increases. As temperature decreases, pressure decreases.

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It is thought that Vitamin C might be an effective preventative
Anon25 [30]

Answer:

IF the fruit juice contains a high level of vitamin C, THEN the preventative effectiveness against common cold increases.

Explanation:

The hypothesis is a testable explanation of a scientific investigation. It aims at predicting the outcome of the experiment. One feature of the hypothesis is that it must be testable. The hypothesis is usually written in an "IF, THEN" format.

This question is regarding an experiment to test the amount of vitamin C in fruit juice. The vitamin C is thought to be an effective preventative against common cold. Hence, the hypothesis connects the effect on common cold (dependent variable) with the amount of vitamin C (independent variable). The hypothesis can be written as:

IF the fruit juice contains a high level of vitamin C, THEN the preventative effectiveness against common cold increases.

7 0
3 years ago
If the density of nitrogen gas at a certain pressure and temperature is 1.20 g/L, how many moles of nitrogen gas are in 15.0 L.
Irina18 [472]
<h3>Answer:</h3>

0.643 moles

<h3>Explanation:</h3>

We are given;

Density of nitrogen gas as 1.20 g/L

Volume nitrogen as 15.0 L

We are required to calculate the number moles of nitrogen gas;

<h3>Step 1: Determine the mass of nitrogen gas</h3>

We know the density is given by dividing mass by volume.

  • Density = Mass ÷ volume

Therefore, to get the mass;

  • Mass = Density × volume
  • Mass = 1.20 g/L × 15.0 L

        = 18 g

<h3>Step 2: Determine the mass of nitrogen gas </h3>

We know that to get the number of moles, we divide mass by molar mass;

That is, moles = Mass ÷ Molar mass

But, molar mass of nitrogen gas is 28 g/mol

Therefore;

Moles of nitrogen gas = 18 g ÷ 28 g/mol

                                     = 0.643 moles

Therefore, the number of moles of nitrogen gas 0.643 moles

5 0
4 years ago
If you weighed out 0.38 g of calcium and reacted it with an excess of hcl, how many moles of h2(g) would you expect to produce?
Hitman42 [59]
Answer is: 0,0095 mol of hydrogen gas will be produced in reaction.
Chemical reaction: Ca + 2HCl → CaCl₂ + H₂.
m(Ca) = 0,38 g.
n(H₂) = ?
n(Ca) = m(Ca) ÷ M(Ca).
n(Ca) = 0,38 g ÷ 40 g/mol
n(Ca) = 0,0095 mol.
from reaction: n(Ca) : n(H₂) = 1 : 1.
n(H₂) = n(Ca) = 0,0095 mol.
n - amount of substance.
4 0
3 years ago
How are the pressure and temperature of a gas related
expeople1 [14]

Answer:

The pressure of a given amount of gas is directly proportional to its absolute temperature, provided that the volume does not change (Amontons's law). ... The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law).

3 0
3 years ago
Read 2 more answers
In the compound Co2O3, cobalt has an oxidation number of ______, while oxygen's oxidation number is -2.
Margaret [11]
In the compound Co2O3, cobalt has an oxidation number of 3, while oxygen's oxidation number is -2. 

An oxidation number is a number assigned to an element in chemical combination that represents the number of electrons lost (or gained, if the number is negative) by an atom of that element in the compound.
8 0
3 years ago
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