Help I need a answer on question 18 and I only got 10 minutes

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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Answer:

Answered B

Explanation:

The earth moves which makes the stars and everything in space seem like its moving

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

Answer:

Carbon and oxygen combine to form two oxides, carbon monoxide and carbon dioxide in which the ratio of the weights of carbon and oxygen is respectively 12:16 and 12:32.

Answer:

The Answer is B

Explanation:

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

Answer:

S8+8o2 = 8so2

this is balance d

2AgCl (s) + Ba(NO3)2 (aq)

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: 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:

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:

c) NOx and VOC

oxides of nitrogen (NOx) and volatile organic compounds (VOC)

Explanation:

-

Answer:

b

Explanation:

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

Answer:

a)0.50

Explanation:

took one for the team :

litmus paper

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

Answer:

where are the answer choices

Explanation:

Answer:

[OH-] = 1.8 x 10^-7

Explanation:

pH + pOH = 14 --> 6.93 + pOH = 14 *subtract 6.93 from both sides

pOH = 7.07

-->

10^pH => 10^-6.93 => 1e - 6.93 [H+]

-->

H+ x OH- = 1 x 10^-6.93 *divide H+ from both sides

-->

[OH-] = 1.17 x 10^-7 or 1.8 x 10^-7

Answer:

Explanation:

HYDRONIUM

Answer:

hydronium

Explanation:

:0

Answer:

Explained below.

Explanation:

What has changed in the atmosphere is that oxidation has occurred where an oxidizing chemical specie has reacted with an oxygen containing compound.

Now these chemicals when they react with rain and fall on rocks react with the rocks to weaken them in a process known as chemical weathering.

Now when this weathering from the oxidizing chemicals from the rain react with rocks that contain iron, it leads to the rock having an appearance of rust.

Answer:

23 L

Explanation:

We'll begin by converting celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T₁) = 100 °C

Initial temperature (T₁) = 100 °C + 273

Initial temperature (T₁) = 373 K

Final temperature (T₂) = 50.5 °C

Final temperature (T₂) = 50.5 °C + 273

Final temperature (T₂) = 323.5 K

Finally, we shall determine the initial volume of gas. This can be obtained as follow:

Initial temperature (T₁) = 373 K

Final temperature (T₂) = 323.5 K

Final volume (V₂) = 20 L

Initial volume (V₁) =?

V₁/T₁ = V₂/T₂

V₁ / 373 = 20 / 323.5

Cross multiply

V₁ × 323.5 = 373 × 20

V₁ × 323.5 = 7460

Divide both side by 323.5

V₁ = 7460 / 323.5

V₁ = 23 L

Thus, the original volume of the gas is 23 L

Answer:

2 significant figures

Explanation:

0.19312

0.19 or 0.2

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:

Light Photons: Light behaves mainly like a wave but it can also be considered to consist of tiny packages of energy called photons. Photons carry a fixed amount of energy but have no mass. The energy of a photon depends on its wavelength: longer wavelength photons have less energy and shorter wavelength photons have more.

Infrared photons: Infrared waves, or infrared light, are part of the electromagnetic spectrum. People encounter Infrared waves every day; the human eye cannot see it, but humans can detect it as heat. A remote control uses light waves just beyond the visible spectrum of light—infrared light waves—to change channels on your TV.

On the electromagnetic spectrum, visible light has a wavelength that falls between 380 nm and 750 nm, whereas infrared light, which marks the beginning of the non-visible spectrum, has a wavelength that falls between 700 nm and 1 mm. Because of this, infrared can only be viewed with specialized tools like security cameras.

A type of radiant energy that we experience as heat, but that is invisible to human eyes is infrared radiation (IR), often known as infrared light. The sun and fire are two of the most prominent sources of IR radiation, however all objects in the cosmos release some of it.

The energy of the photons determines the various types of radiation, starting with radio waves with low energies. In comparison to visible, ultraviolet, X-ray, and gamma ray photons, which are the most energetic of all, microwave photons have somewhat higher energy. Infrared photons have even more energy.

Cooler objects produce lower energy, longer wavelength photons, while hotter ones release higher energy, shorter wavelength photons.

Thus, On the electromagnetic spectrum, visible light has a wavelength that falls between 380 nm and 750 nm, whereas infrared light.

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Answer:

Explanation:

THE PLANET NAME IS NEPTUNE

A catalyst used in a reaction remains unchanged

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:

a= 7.07 m/s^2

Explanation:

Newton's second law of motion states that the acceleration of an object is produced by the net force.

the formula to calculate the force: F=ma

you just rearrange it to solve for a

a= F/m a=223/31.5

=7.07

Answer:

Explanation:

[tex] \frac{P _{1} V _{1} }{T _{2}} = \frac{P _{2} V _{2}}{T _{1}} \\ \frac{(101300 \times 7)}{(21.5 + 273)} = \frac{(101300 \times 4)}{T _{2}} \\ T _{2} = \frac{(405200 \times 294.5)}{(709100)} \\ T _{2} = 168.3 \: kelvin \\ decrease \: in \: temperature = (294.5 - 168.3) \\ = 126.2 \: kelvin[/tex]

Answer:

Any substance which occupies space and has mass is known as matter. States of matter: Matter exist in three different states that are Solid, Liquid and Gas. Matter is made up of very small particles

Explanation: