!!Please help I will name u brainliest!! this is for 9th grade physical science​

Answer:

Hallo whats up?

Explanation:

Answer:

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{3.01 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.01}{6.02} = 0.5 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

I'm pretty sure the volume decreases because the volume is like how much space it takes up. Sorry if im wrong.

Answer:

The answer is D.

Explanation:

Because the SI units of mass is kg,

volume is m³,

length is m,

Temperature is Kelvin.

Explanation:

Hi for this one u just need to remember and use the equation.

[tex]moles = \frac{mass}{mr} [/tex]

then u find mr of potassium which is 39.1.

then u do

[tex] \frac{20}{39.1} [/tex]

you get the answer as 0.5115 write ur answer to 3 significant figures which will be 0.512 moles .

hope this helps :)

Answer:

No

Explanation:

In order for glucose to be produced inside the mixture, photosynthesis has to take place. The photosynthetic process requires a series of steps within an organelle called the chloroplast. The chloroplast contains the chlorophyll and other enzymes that are necessary for photosynthesis.

Once the chlorophyll is isolated, it becomes separated from the enzymes necessary for the completion of photosynthesis, and the process is truncated. When light is shined on the mixture, the majority would instead be lost as heat while some cause the chlorophyll molecules to glow.

Answer:

How many gallons of water are on earth?

Why does salt water make you sticky and burn our eyes so bad?

Explanation:

These are just a couple questions I came up with just now

I hope that this helps

Answer:

1,1,1

decomposition reaction

Explanation:

The reaction equation is given as:

      _Ca(OH)₂  →   _CaO    +   _H₂O

This reaction is a decomposition reaction in which a single reactant breaks down to give two or more products.

To balance the equation, we assign variables a, b and c, then we use a mathematical approach to solve the problem;

          aCa(OH)₂  →   bCaO    +   cH₂O

Conserving Ca : a = b

                    O:  2a  = b + c

                   H:   2a = 2c

let a  = 1, b = 1 , c = 1

Answer:

49.18 eV hope this helps

Answer:

From top to bottom down a group, electronegativity decreases. This is because atomic number increases down a group.

Answer:

From top to bottom down a group, electronegativity decreases. This is because atomic number increases down a group, and thus there is an increased distance between the valence electrons and nucleus, or a greater atomic radius.

Explanation:

Answer:

Mercury did u want me to explain or u wanted the answer

Explanation:

Answer:

b

Explanation:

the plates crash into each other and form a mountain yea that's it

Explanation:

pH is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution.

Answer:

398 mL

Explanation:

Using the equation for molarity,

C₁V₁ = C₂V₂ where C₁ = concentration before adding water = 8.61 mol/L and V₁ = volume before adding water, C₂ = concentration after adding water = 1.75 mol/L and V₂ = volume after adding water = 500 mL = 0.5 L

V₂ = V₁ + V' where V' = volume of water added.

So, From C₁V₁ = C₂V₂

V₁ =  C₂V₂/C₁

= 1.75 mol/L × 0.5 L ÷ 8.61 mol/L

= 0.875 mol/8.61 mol/L

= 0.102 L

So, V₂ = V₁ + V'

0.5 L = 0.102 L + V'

V' = 0.5 L - 0.102 L

= 0.398 L

= 398 mL

So, we need to add 398 mL of water to the nitric solution.

Answer:

As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer. There are two basic types of waves: mechanical and electromagnetic

Explanation:

hope it helps

plz mark it as brainlist

Answer:

Call of balls massive sack

Explanation:

Yoooo

Answer:

I believe B

Explanation:

Hope this helps

Answer:

None of these answers are correct.

CO2 is a covalent not ionic compound

It DOES melt, though at a very low temperature

Its melting point is negative, not high

Explanation:

Answer:

The correct answer is D

Explanation:

Ice is a solid, so if heat is added to it the ice will melt causing it to form into a liquid, once the ice turns into a liquid, it begins to turn into gas.

Your welcome!

Answer:

This isotope of fluorine has 9 protons, 9 electrons and 10 neutrons.

Explanation:

The atomic number is the number of protons  ( p + ) . In a neutral atom, the number of electrons  ( e − )  equals the number of protons. Mass number is the sum of the protons and neutrons  ( n 0 )  of a particular isotope. If you have mass number and atomic number, subtract the atomic number from the mass number to get the number of neutrons.  ( Mass number ) − ( atomic number ) = number of neutrons .

There are:

9 protons

9 electrons

10 neutrons

Fluorine is the element in question, as its atomic number is  9 . You would name this particular isotope using the mass number. It would be called fluorine-19.

The nuclear or isotopic notation would be  19 9 F

Answer:

Photosynthesis uses water and Carbon Dioxide to produce sugar and oxygen.

Explanation:

During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose.

Answer:

6) λ  =  0.84 × 10⁻⁸ m

7) λ  =  0.84 × 10⁻⁶ m

Explanation:

6) Given data:

Wavelength of photon = ?

Frequency of photon = 3.56 × 10¹⁶ Hz

Solution:

Formula:

Speed of radiation = frequency × wavelength

c = speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s  = 3.56 × 10¹⁶ Hz ×  λ

λ  =  3×10⁸ m/s   / 3.56 × 10¹⁶ s⁻¹

λ  =  0.84 × 10⁻⁸ m

7) Given data:

Wavelength of photon = ?

Frequency of photon = 6.15 × 10¹⁴ Hz

Solution:

Formula:

Speed of radiation = frequency × wavelength

c = speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s  =  6.15 × 10¹⁴ Hz ×  λ

λ  =  3×10⁸ m/s   /  6.15 × 10¹⁴ Hz s⁻¹

λ  =  0.84 × 10⁻⁶ m

Answer:

I'm pretty sure it's B

Explanation:

If i'm wrong i'm sorry :(

Solar energy has been proven to be the most efficient and effective among renewable energy sources for home and commercial use.

Hope this helpes UwU

Answer:

Basically it would be  8.5g. Not total sure.

Explanation:

If its right plz give brainlest.

Answer:

A. 8.5g

Explanation:

Have a great day!

Answer:

yes

Explanation:

In eukaryotes, however, genetic material is housed in the nucleus and tightly packaged into linear chromosomes. Chromosomes are made up of a DNA-protein complex called chromatin that is organized into subunits called nucleosomes.

Answer:

Explanation:

Mendel used letters to represent dominant and recessive factors. Likewise, geneticists now use letters to represent alleles. Capital letters refer to dominant alleles, and lowercase letters refer to recessive alleles.