What is the number whose 25% is 800?​

Answer

CH3Cl is polar amoungst the choices

Answer:

option A

decrease in the concentration will light up the reaction so it will shift to right side

Answer:

b

Explanation:

b. ,u play with the ball, handle the ball grab the ball throw the ball exc.

Answer: A:

K(A)(B)2

Explanation: gradpoint

Answer:

The Answer is B

Explanation:

Fossil fuels take millions of years to be made, and every other answer doesn't make sense

Answer:

Sulfur molecules

Explanation:

Chemosynthesis can be defined as the process of producing the energy rich nutrients molecules from the chemicals. The chemosynthesis bacteria are those bacteria that are capable of absorbing chemicals from the ocean floor like hydrogen sulfide.

Thus it is a process of making energy rich molecules using the chemical energies.

In the context, sulfur molecules are the sources of energy for the process of chemosynthesis.

Answer:

Explanation:

Each bottle leaks harmful chemicals into our environment along the way as it decomposes. Studies show that the toxins decomposing bottles of water leach into our environment cause a variety of health issues, including reproductive problems and cancer.

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From a chemicals standpoint, Student 2 contends that as global population grows, so does the need for water. This is the correct reasoning.

What is the purpose of chemistry?

Our basic needs of food, clothes, shelter, health, energy, and pure air, water, and soil are all met by chemistry. Chemical technologies improve our quality of life in many ways by offering fresh approaches to issues with health, resources, and energy use.

What subjects are studied in chemistry?

The study of matter, including its properties, behaviours, and structures, is known as chemistry. Chemists induce and monitor these reactions both in nature and artificially in a lab setting because they are interested in how materials behave and react in specific settings.

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Explanation:

Fractional distillation is used to separate crude oil into simpler, more useful mixtures . This method can be used because different hydrocarbons have different boiling points

Hope this help u

Answer:

Explanation:

The pH of a solution can be found by using the formula

[tex]pH = - log [ { H_3O}^{+}][/tex]

From the question we have

[tex]pH = - log(0.36) \\ = 0.4436...[/tex]

We have the final answer as

Hope this helps you

The statement in which La Niña affect the climate of the Pacific Ocean is "The cold water sinks deeper into the ocean."

La Niña is a climate phenomenon that depicts the cooling of surface ocean waters along the coast of South America's tropical west coast.

The average weather in a certain place over a longer length of time is referred to as climate.

The jet stream moves northward and weakens across the eastern Pacific as a result of La Niña. The South experiences warmer and drier weather than usual during La Nia winters. The North and Canada are wetter and colder than the rest of the country. The seas off the Pacific coast are cooler and contain more nutrients than typical during La Niña.

Water in the eastern Pacific is colder than typical because to La Niña. El Niño might cause the water to be warmer than usual in the same place. During La Niña years, drought-stricken areas are drenched, while El Niño years are drenched.

Hence the correct option is 2.

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Explanation:

He led the world's first national-scale assessment of damage to coral reefs leading to international conservation initiatives such as the replanting of corals. He also pioneered giant clam (Tridacna gigas) breeding stationed in Bolinao and other protective areas for coastal communities of the Philippines

Answer:

I don't think so

Explanation:

That's what I got

Answer:

1.03 atm

Explanation:

Primero convertimos 21 °C y 37 °C a K:

Una vez tenemos las temperaturas absolutas, podemos resolver este problema usando la ley de Gay-Lussac:

En este caso:

Colocando los datos:

Y despejando P₂:

Answer:

Here's what I got.

Explanation:

Interestingly enough, I'm not getting

0.0341% w/v

either. Here's why.

Start by calculating the percent composition of chlorine,

Cl

, in calcium chloride, This will help you calculate the mass of chloride anions,

Cl

−

, present in your sample.

To do that, use the molar mass of calcium chloride, the molar mass of elemental chlorine, and the fact that

1

mole of calcium chloride contains

2

moles of chlorine atoms.

2

×

35.453

g mol

−

1

110.98

g mol

−

1

⋅

100

%

=

63.89% Cl

This means that for every

100 g

of calcium chloride, you get

63.89 g

of chlorine.

As you know, the mass of an ion is approximately equal to the mass of the neutral atom, so you can say that for every

100 g

of calcium chloride, you get

63.89 g

of chloride anions,

Cl

−

.

This implies that your sample contains

0.543

g CaCl

2

⋅

63.89 g Cl

−

100

g CaCl

2

=

0.3469 g Cl

−

Now, in order to find the mass by volume percent concentration of chloride anions in the resulting solution, you must determine the mass of chloride anions present in

100 mL

of this solution.

Since you know that

500 mL

of solution contain

0.3469 g

of chloride anions, you can say that

100 mL

of solution will contain

100

mL solution

⋅

0.3469 g Cl

−

500

mL solution

=

0.06938 g Cl

−

Therefore, you can say that the mass by volume percent concentration of chloride anions will be

% m/v = 0.069% Cl

−

−−−−−−−−−−−−−−−−−−−

I'll leave the answer rounded to two sig figs, but keep in mind that you have one significant figure for the volume of the solution.

.

ALTERNATIVE APPROACH

Alternatively, you can start by calculating the number of moles of calcium chloride present in your sample

0.543

g

⋅

1 mole CaCl

2

110.98

g

=

0.004893 moles CaCl

2

To find the molarity of this solution, calculate the number of moles of calcium chloride present in

1 L

=

10

3

mL

of solution by using the fact that you have

0.004893

moles present in

500 mL

of solution.

10

3

mL solution

⋅

0.004893 moles CaCl

2

500

mL solution

=

0.009786 moles CaCl

2

You can thus say your solution has

[

CaCl

2

]

=

0.009786 mol L

−

1

Since every mole of calcium chloride delivers

2

moles of chloride anions to the solution, you can say that you have

[

Cl

−

]

=

2

⋅

0.009786 mol L

−

1

[

Cl

−

]

=

0.01957 mol L

−

This implies that

100 mL

of this solution will contain

100

mL solution

⋅

0.01957 moles Cl

−

10

3

mL solution

=

0.001957 moles Cl

−

Finally, to convert this to grams, use the molar mass of elemental chlorine

0.001957

moles Cl

−

⋅

35.453 g

1

mole Cl

−

=

0.06938 g Cl

−

Once again, you have

% m/v = 0.069% Cl

−

−−−−−−−−−−−−−−−−−−−

In reference to the explanation you provided, you have

0.341 g L

−

1

=

0.0341 g/100 mL

=

0.0341% m/v

because you have

1 L

=

10

3

mL

.

However, this solution does not contain

0.341 g

of chloride anions in

1 L

. Using

[

Cl

−

]

=

0.01957 mol L

−

1

you have

n

=

c

⋅

V

so

n

=

0.01957 mol

⋅

10

−

3

mL

−

1

⋅

500

mL

n

=

0.009785 moles

This is how many moles of chloride anions you have in

500 mL

of solution. Consequently,

100 mL

of solution will contain

100

mL solution

⋅

0.009785 moles Cl

−

500

mL solution

=

0.001957 moles Cl

−

So once again, you have

0.06938 g

of chloride anions in

100 mL

of solution, the equivalent of

0.069% m/v

.

Explanation:

i think this is it

Answer:

Answer:

shorten reaction time

...........

Answer:

1 moles Carbon Dioxide = 44.0095 gram using the molecular weight calculator and the molar mass of CO2

Explanation:

The molecules in 0.87 mole of carbon dioxide are 5.2 x 10²³.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

If there are 6.023 × 10²³ molecules present in one mole of carbon dioxide then for 0.87 moles

[tex]6.023 \times 10^2^3 \times 0.87 = 5.2 \times 10^2^3[/tex]

Thus, the molecules in 0.87 mole of carbon dioxide are 5.2 x 10²³

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Answer:

D. Water changes state when it loses or gains energy.

Explanation:

When water gains energy, it turns from ice to water, or water to gas. When water loses energy, it turns from gas to water, or water to ice.

Particles in the water move faster and create more energy when heated, and this causes them to spread wider apart and change. Particles slow down and move closer together when they get cold.

Answer:

where are the answer choices

Explanation:

A. 1:1

Explanation:

hope this helps ya :)

According to the balanced equation below.

PCl₃ +Cl₂ → PCl₅

The mole ratio of PCl₃ to PCl₅ is 1:1.

Balancing of a reaction is done according to the "Law of conservation of mass" and balancing helps in solving stoichiometry questions correctly as if we will not balance the reaction then the quantitative results in a particular question doesn't come correctly.

Balancing of a reaction helps in mole concept as well and it is one of the laws of chemical reactions as well.

Some examples of balanced chemical reactions are-

2Mg(s) + O₂(g) ⟶ 2MgO(g)

Given reaction is,

PCl₃ +Cl₂ → PCl₅

Therefore, The mole ratio of PCl₃ to PCl₅ is 1:1.

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Answer: Red-Shift

Explanation:

It suggests that the universe is expanding, as distant stars/galaxies must be in motion away from us to cause the light to shift towards the red end of the spectrum (or into longer wavelengths of the EM spectrum). This agrees with the Big bang theory as that suggests the universe is expanding.

Answer:

Explanation:

Look at the reaction.

2NH3 ===> N2 + 3H2

It's a molecule that is breaking down to two elements on the periodic table. We used to call such a thing as a simple decomposition.

Answer:

The pressure of the gas will increase.

Explanation:

This concept of change in state properties of gas, when compressed in a moveable piston-cylinder assembly, can be explained by using Boyle's law

Boyle's law states that the pressure of a given mass of gas is inversely proportional to its volume given that temperature remains constant.

Following this law, when the gas in the container is compressed to a smaller volume, the pressure will go up.

This is also because the gas is not free to move about without frequent collisions with itself and the walls of the container, due to the resulting smaller space after compression. Therefore, the force it exerts on the walls of the container and the frequency of collision are more.

Answer:

The increase in the reverse reaction

Explanation:

Based on the LeCh's principle, a change in the concentration of a species in the equilibrium will shift the concentrations of the other species in order to counteract the effect of this change.

For example, for the reaction:

A + B ⇌ AB

Remove A in this reaction will produce the increase in the reverse reaction in order to increase the concentration of A.

Answer:

in particular 69-189  084 = 9283983

litmus paper

Because it will just tell if the solution is acidic or basic, it won't tell the pH

if it is already as low as it can go

Answer:

you generally can't convert between units of mass and volume (e.g., grams to gallons).

Explanation: Examples of Conversion Factors Remember, the two values must represent the same quantity as each other. For example, it's possible to convert between two units of mass (e.g., grams to pounds),

Answer:

Silver 0.237 J/g °C

Explanation:

We know that the heat required to raise the temperature of a given mass of a substance through a given temperature rise is given by;

H = mcθ

Where;

m = mass of the body

c = specific heat capacity of the body

θ = temperature rise

10.1 J = 2.8 g * c * (36°C - 21°C)

c = 10.1 J /  2.8 g * (36°C - 21°C)

c = 0.24 J/g °C