CHEMISTRY HIGH SCHOOL

Which state of matter is more dense?​

Answers

Answer 1
Answer:

Answer:

Gas - Liquid - Solid

Explanation:

If you are asking which state of matter is more dense of which, then this is the order.

- Liquid is more dense than Gas

- Solid is more dense than Liquid

- Gas is less dense than Air

Just to let you know, Solid is the most dense of them all, making Gas the least dense of the three.

Hope this helps! ^^
Answer 2
Answer:

solids have more dens than any type of matter and I am sure btw

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Which factor is NOT used to determine a star's apparent magnitude?a
how big the star is
b
how hot the star is
c
how dense the star is
d
how far away the star is

Answers

B



Magnitude is about how far away the star is, how big it is, and how bright it is.

Select all of the answers that apply. Which of the following are ways the atmosphere supports life? contains trace gases blocks harmful UV rays transports and distributes heat cycles essential elements: C, O, and N

Answers

Answer:  Blocks harmful UV rays transports and distributes heat cycles essential elements: C, O, and N

Explanation:

The atmosphere is the integral part of the earth this typically includes gases which are necessary for sustaining lives on earth. The earth atmosphere forms a protective blanket around the inner earth which prevents the entry of majority of UV rays directly coming from the sun, This way atmosphere plays an important role in protecting the living beings from carcinogenic UV rays. It distributes the heat coming from the sunlight also it reflect back the absorb heat energy to the space acquired from the sun so as to maintain the balance of heat on planet earth.

It essentially plays an important role in circulation of essential gaseous elements like carbon, oxygen and nitrogen as these are required by the plants to conduct photosynthesis, respiration and protein synthesis respectively. Majorly all other life forms on earth are dependent on plants for food requirements therefore this cycling is beneficial for sustaining their lives too.

Blocks harmful UV Rays, Transports and distrubites heat, and Cycles essential elements: C, O , and N

The Suns ultraviolent Rays can cause skin damage including sunburn and even skin

Answers

yes , because UV rays are super harmful , the reason why you'd apply sun screen . The UV rays are blocked by the ozone layer , except when there is too much of global warming. 

Calculate the number of molecules in 210 grams of H2O

Answers

The number of molecules in 210 grams of H₂O is 72.48 x 10²⁴.

What are moles?

The mole is a SI unit of measurement that is used to calculate the quantity of any substance. The number of models of any substance can be calculated by dividing the mass by the molar mass of the substance or compound.

Mole = mass / molar mass

Given the mass of wateris 210 grams

The molar mass of water is 18.01g/mole

The mass and the molar mass will be divided.

210 / 18.01g = 11.653 mole

Now, here 1 mole is 6.22 x 10²³ molecules, so the 6.22 x 10²³ will be multiplied by the 11.653 to get the molecules of 210-gram water.

1 mole has 6.22 x 10²³  molecules

11.653 mole x 6.22 x 10²³ = 72.48 x 10²⁴

Thus, the number of molecules of H₂O is 72.48 x 10²⁴.

To learn more about moles, refer to the link:

brainly.com/question/21323029

#SPJ2
H2O=18.01g/mole. 210g divided by 18.01g/mole=11.653mole. 1 mole has 6.22x10^23 molecules. So there is 11.653x(6.22x10^23) molecules. Just multiply 11.653 by 6.22. Then put it as answerx10^23 molecules

For each of the following strong base solutions, determine [OH−],[H3O+], pH, and pOH of 1.13×10^−2 M Ba(OH)2, 1.8x10^-4 M KOH, and 5.3x10^-4 M Ca(OH)2

Answers

pH calculations of strong base solutions are pretty direct. It all depends on how many OH- ions are dissociated and the concentration of the solution.

Ba(OH)2:

Since there are 2 OH- ions, the concentration of [OH-] is twice the concentration of the solution. Take the pOH by using the equation pOH = -log[OH-]. From here, you can get the pH by subtracting the pOH from 14. Finally, calculate the [H3O+] or [H+] concentration by using the equation pH = -log[H+] or [H+] = 10^(-pH)

[OH-] = 2 x 1.13x10^-2 M = 2.26x10^-2
pOH = -log[OH-] = 1.65
pH = 14 - 1.65 = 12.35
[H3O+] = 10^(-12.35) = 4.47x10^-13

Follow the same rule for the other compounds.

KOH:

[OH-] = 1.8x10^-4 M
pOH = -log[OH-] = 3.74
pH = 14 - 3.74 = 10.26
[H3O+] = 10^(-10.26) = 5.50x10^-11

Ca(OH)2:
[OH-] = 2 x 5.3x10^-4 M = 1.06x10^-3 M
pOH = -log[OH-] = 2.97
pH = 14 - 2.97 = 11.03
[H3O+] = 10^(-11.03) = 9.33x10^-12

What is the total mass of 2.0 moles of diatomic hydrogen?

Answers

Explanation:

A diatomic molecule is defined as the molecule which contains two atoms.

For example, a H_(2) molecule has two atoms of hydrogen.

Molar mass of a H_(2) molecule is 2.0 g/mol. Therefore, calculate the mass of 2.0 moles of diatomic hydrogen as follows.

        No. of moles = \frac{mass}{\text{molar mass}}

                2.0 mol = (mass)/(2.0 g/mol)

                mass = 1 g

therefore, we can conclude that total mass of 2.0 moles of diatomic hydrogen is 1 g.

diatomic hydrogen is written as H2                                                                                (2.02 grams H2) <------- if each hydrogen atom is 1.01 grams, then two hydrogen atoms are 2.02 grams                                                                                                                  2.0 moles H2 X 2.02 grams H2                                                                                             ------------- (divide to cancel moles)   = 4.04 grams/mole H2 ÷ one mole = 4.04 grams H2

                                                          

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