Chemistry High School

True or false. (Pls help)

Answers

Answer 1

I believe they’re both true.

Answer 2

Answer:

1.) False?

2.) true. sorry english not my first language

Related Questions

If a neutral compound is composed of carbon and hydrogen and you know that it has exactly 2 carbons connected by a double bond, how many hydrogens will the compound have?

Answers

Answer: 4 hydrogens

Explanation:

This is what the structure will look like C=C. Remember that it's important that all structures have a complete octet. As it looks right now each carbon is sharing 4 valence electrons so each needs 2 more bonds to hydrogen complete its octet.

Answer: 4 hydrogens

Explanation:

In the future, what would you expect to happen to the distances between galaxies?

Answers

The distances between galaxies are expected to increase.

This is due to the endless expansion of the universe, proposed by cosmological inflation.

Compare a mixture and a compound. How are they alike?
Contrast a mixture and a compound. How are they different

Answers

Answer:

1.Difference.

Mixtures are physically combined and can be separated by physical means while compounds are chemically combined and are separated by chemical means.

2.Mixtures do not have mixed boiling and melting points while compounds have mixed boiling and melting points.

2.Similarity.

Both mixtures and compounds are composed of two or more substances or elements combined.

Both can be separated.

Similarity between Mixture and Compound.

Mixtures and compounds are alike in the following ways:

1. Both mixture and compound contains two or more substances.

2. Both mixture and compound can be separated.

3. Both mixture and compound have physical properties.

Differences between mixture and compound:

Mixtures and compounds are different in the following ways:

1. A mixture contains two or more substances that are not chemically combined together while a compound contains two or more substances chemically combined together.

2. A mixture can be separated by physical methods while a compound can only be separated by chemical methods.

3. Mixtures can not be represented using a chemical formula. Compounds can be represented by chemical formula.

4. Examples of mixtures include: milk, kerosene in water etc. Examples of compounds include water, sodium chloride etc

Learn more: https://brainly.com/question/184321

A beaker contains 318 mL
m
L
of a 5.75 M
M
HCl(aq)
H
C
l
(
a
q
)
solution. Determine the new concentration of the solution after it is diluted by adding 143 mL
m
L
of water to the beaker.

Answers

Answer:

3.97 M

Explanation:

Given data:

Initial volume V₁ = 318 mL

Initial molarity M₁ = 5.75 M

New volume V₂= 461 mL

New concentration M₂= ?

Solution:

New volume V₂= 143 mL+ 318 mL

New volume V₂= 461 mL

Formula:

M₁V₁ = M₂V₂

M₂ = M₁V₁ / V₂

M₂ = 5.75 M × 318 mL / 461 mL

M₂ = 1828.5 M. mL/ 461 mL

M₂ = 3.97 M

What is the temperature of someone with a fever? Select the better estimate.
40°F
40°C

Answers

Answer:

40°C

Explanation:

THIS S VERY HIGH FEVER

AS 40°C = 104°F

Answer:

Chemical weathering changes the composition of the original minerals.

Explanation:

How many moles are there in 3.612 x 1024 atoms of Sulfur?

Answers

Answer:

The answer is 6 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.612 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]

We have the final answer as

6 moles

Hope this helps you

With a force of 5 newtons, Amanda pushes the stack of books to the right. At the same time, Jeremy, her little brother, pushes the stack of books to the left with a force of 10 newtons.

Answers

Answer:

A. 5 N to the left

Note: The question is incomplete. The complete question is given below:

With a force of 5 newtons, Amanda pushes the stack of books to the right. At the same time, Jeremy, her little brother, pushes the stack of books to the left with a force of 10 newtons.

What is the direction and magnitude of the resulting force?

A. 5 N to the left

B. 5 N to the right

C. 10 N to the right

D. 10 N to the left

Explanation:

Forces are vector quantities.

Vector quantities are quantities that can be represented both in magnitude and direction.

Forces have both magnitude and direction. Forces can be directed positively or negatively.

For example, in the question above, if forces acting to the right are considered to be in the positive direction, forces acting to the left are considered to be acting in a negative direction.

In the addition of forces, both their magnitude and direction are taken into consideration.

In the example above, taking forces acting to the right as positive and to the left as negative, the sum of the forces is:

Resultant force, F = (5 N) + (-10N)

F = -5 N

Therefore, the net force is 5 N and is directed towards the left

Answer:

5 N to the left

Describe the role of the ocean in the water cycle?

Answers

Answer:

Don't get me wrong the seas are, by distant, the biggest store of water on soil, over 96% of all of Earth's water exists within the seas. Not as it were do the seas give dissipated water to the water cycle, they moreover permit water to move all around the globe as sea streams. I mean, that's all i know man, give me a break.

Explanation:

First of all, going off of the water cycle: evaporation, condensation, precipitation and collection
What would make the most sense that the ocean would have a role of? Well it would be evaporation in the water cycle because the ocean is 97.5% of all water and is the main source for condensation, precipitation and collection. But it’s main role is collection of water to be evaporated into the cycle.

Hope this helps :)

A student needs to use sodium nitride in an experiment and finds a chemical with the formula NaNO3 . Is this the correct compound? Why or why not?

A. Yes, NaNO3 is the formula for sodium nitride.
B. No, NaN is the formula for sodium nitride; NaNO3 is the formula for sodium nitrate.
C. No, NaN is the formula for sodium nitride; NaNO3 is the formula sodium nitrite.
D. No, Na3N is the formula for sodium nitride; NaNO3 is the formula for sodium nitrat

Answers

Answer:

Yes, NaNO3 is the formula for sodium nitride.

What is the half life of an atom that goes from 16000 g to 125 g in 163.24 days.

Answers

Answer:

[tex]23.32\ \text{days}[/tex]

Explanation:

N = Final mass of atom = 125 g

[tex]N_0[/tex] = Initial mass of atom = 16000 g

t = Time taken = 163.24 days

[tex]t_{1/2}[/tex] = Half life

We have the relation

[tex]N=N_0\dfrac{1}{2}^{\dfrac{t}{t_{1/2}}}\\\Rightarrow 125=16000\times \dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \dfrac{125}{16000}=\dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \ln0.0078125=\dfrac{163.24}{t_{1/2}}\ln0.5\\\Rightarrow t_{1/2}=\dfrac{163.24\times\ln0.5}{\ln0.0078125}\\\Rightarrow t_{1/2}=23.32\ \text{days}[/tex]

The half life of the atom is [tex]23.32\ \text{days}[/tex].

Tonya had a mixture of sand, salt, iron particles, and pebbles. What processes should be used to separate the substances in the mixture from each other?

Answers

Explanation:

Put the pan into a water-containing dish and mix well. Now use a strainer to transfer the solution into another jar. The salt should disappear in it.

And using a tube with a filtrate, transfer the salts that has sand into another bottle with a filtrate. Therefore the sand is split. Eventually, when all the water vaporizes and the salt stays in the bottle, leave the extra solvent and heat it.

At a constant temperature, 2L of a gas at 4atm of pressure is expanded to 6L. What is the new pressure? Please show steps!!

Answers

Answer:

The answer is 1.33 atm

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{2 \times 4}{6} = \frac{8}{6} = \frac{4}{3} \\ = 1.333333...[/tex]

We have the final answer as

1.33 atm

Hope this helps you

7. Where can electrons be found in an atom?
- electron cloud
- nucleus
- both nucleus and electron cloud
- electrons cannot be found in atoms

Answers

Electrons can be found in the electron cloud.

The nucleus contains protons and neutrons, not electrons, and atoms do contain electrons, thus the answer is the electron cloud (hence the name ELECTRON cloud)

whats a proton? answer

Answers

Answer:

a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

Explanation:

can i get brainliest

Answer:

a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

Explanation:

Four substances are tested for different properties. The results of the tests are in the table below.

Substance
Combustible
Reactivity
Solubility in water
Solubility in ether
Boiling point (ºC)
W
Yes
Yes
Soluble
Insoluble
883
X
Yes
No
Insoluble
Insoluble
2,750
Y
Yes
No
Insoluble
Soluble
196
Z
No
Yes
Soluble
Soluble
98

Which substance is most likely an alkane?
W
X
Y
Z

Answers

Answer:

Element Y, or the third option

Explanation:

Alkanes are insoluble in water, but soluble in ether. Their boiling points are pretty low, barely reaching 200 degrees, so element Y is an alkane.

Answer:

Explanation:

True or False:Excessive thermal energy will result in the removal of salt from the oceans.

Answers

Answer:

false

do not listen to the haters

Calculate the average atomic mass of antimony
Antimony-121 has a mass of 120.904 amu and a natural % abundance 57.21
Antimony-123 has a mass of 122.904 amu and a natural % abundance of 42.79
can you give the work aswell trying to understand how to do it

Answers

Answer:

Wow, now this one is a hard one, took me quite a while to figure it out but here it is

The abundances of the two isotopes is:

Antimony-121 = 57.2%

Antimony-123 = 42.8%

Explanation:

Which procedure is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele?

selective breeding
cloning
artificial selection
gene therapy

Answers

artificial selection

Answer:

Hi, the answer is C. Artificial Selection

I know this becasue I just finished my test

Explanation:

Why are ions usually formed during the interaction of metal with nonmetal and not between two metals?

Answers

Explanation:

Ions are always formed when metals and non-metals interact because metals are electropositive. They willing release electrons to non-metals that are electronegative.

This activity results in charge separation. The transfer of electrons from one specie to another is what results in an ionic bond and the precedence of charged particles.

Between non-metals, the electrons are jointly shared. Therefore, there is no charge separation.

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