I need help, plz and thank you.

Explanation:

Mixtures can be separated using a variety of techniques. Chromatography involves solvent separation on a solid medium. Distillation takes advantage of differences in boiling points. Evaporation removes a liquid from a solution to leave a solid material.

Answer:

i think its letter D

Explanation:

Answer:

I think it is B if it is not then I am sorry.

Explanation:

Answer:

FALSE

Explanation:

they were much more diverse

Answer:

I would say a dense cloud of interstellar gas and dust.

Answer:

B

Explanation:

trust me im 100% correct

Answer:the answer is a chemical change, because a gas was produced

Explanation:  yeast is a chemical

Answer:

The answer is C.

"Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions."

Explanation:

Answer: a) -1

Explanation:

Answer:

because our planet is spinning

which means the objects near the equator are moving at much faster velocities than objects at higher latitudes

I hope this helps✌

Answer:

60.9 Kelvin

Explanation: First, write out everything that you know. You are tring to find the temperature, so the temperature will be represented by x.

Pressure (P)= 4.5 atm

Volume (V)= 3L

Number of Moles (n)= ?

Gas Consant (R)= 0.0821, if the pressure is in atm, that means r is 0.0821

Temperature (T)= x

We don't have all the information we need to plug the values into the equation. We still need to know how many moles 55.0 grans of neon is.

Ne in Grams= 55

Atomic Mass of Ne= 20.1797

55/20.1797= 2.7  

moles= 2.7

Now that we have all the information we need, plug everying into the equation. In case you don't know, the Ideal Gas Law Equation is PV= nRT.

(4.5)(3) = (2.7)(0.821)x    

x= 60.9

Now you have your temperature! It is 60.9 in Kelvin.

Answer:

mostly metals

Explanation:

just learned

Answer:

C. sorry i am late :)

Explanation:

During photosynthesis, plants intake carbon dioxide from the air and releases oxygen. Thus, they are providing enough oxygen available for humans to breath.

Photosynthesis is a bio-chemical process by which green plants produces chemical energy with the aid of light energy absorbed by chlorophyll. Photosynthetic reaction is the combination of carbon dioxide and water giving molecular oxygen and glucose.

Through photosynthesis, the amount ox oxygen and carbon dioxide in the atmosphere is balanced. This balancing cycle involves respiration of animals also.

The carbon dioxide that we exhale are up taken by plants and converts to oxygen gas. This makes sufficient oxygen for all animals to breath. Therefore, photosynthesis is a stage in carbon cycle and oxygen cycle.

To find more on photosynthesis, refer here:

https://brainly.com/question/29776072

#SPJ5

Answer:

See explanation

Explanation:

When an optically active compound reacts with a racemic mixture, two different products appear .

Hence, when (R)-sec-butylamine reacts with a racemic mixture of 2-phenylpropanoic acid as shown in the image attached.

Enantiomers are optical isomers which are mirror images of each other. The image attached was obtained from Bartleby.

Answer:

2

Explanation:

thats the answer.have good day

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 16 g

volume = 512 cm³

We have

[tex]density = \frac{16}{512} = \frac{1}{32} \\ = 0.03125[/tex]

We have the final answer as

Hope this helps you

Answer:

The answer is 8cm

Explanation:

:)

Answer:

8 cm

Explanation:

Answer:

1. 1g/ml

Explanation:

1. Density is mass divided by volume (g/mL).

10g/10mL = 1 g/mL

2. When you already know the density and the volume, you can use the density as a unit converter.

[tex]5mL*\frac{20g}{mL} = 100g[/tex]

3. It's the same with density and mass.

[tex]20g*\frac{1mL}{5g} = 4mL[/tex]

Answer:

42%

Explanation:

Answer:

The further away electrons are from the nucleus the easier it is for atoms to use electrons.

Explanation:

Answer:

B.

Explanation:

It’s because when you subtract 78.5 and 77.5 you get 1. And when you do 79.5 and 78.5 you get 1 too. I know this because I got the answer right

Answer:

it blows up very lighty

Explanation:

Answer:

c-convection

Explanation:

i think it may help you and if its helpful plzz mark as brilliant

Answer:

Q = -627.6 J

Explanation:

Mass, m = 15 grams

Initial temperature, [tex]T_i=40^{\circ} C[/tex]

Final temperature, [tex]T_f=30^{\circ} C[/tex]

We need to find the amount of heat released by this much of sample of water. We know that heat released is given by the below formula :

[tex]Q=mc\Delta T[/tex]

c is specific heat of water, [tex]c=4.184\ J/g-K[/tex]

[tex]\Delta T=T_f-T_i\\\\=(30^{\circ}-40^{\circ} )\ C\\\\=-10^{\circ} C\\\\=-10\ K[/tex]

So,

[tex]Q=15\times 4.184\times -10\\\\Q=-627.6\ J[/tex]

Hence, 627.6 J of heat is released and negative sign shows that energy is being given off.

Explanation:

its +5 trust me on this hope this helps kiddo

Answer:

false

Explanation:

jk true

Answer:

c. .....................

Answer: the amount of carbon dioxide put into the atmosphere due to your consumption of fossil fuels

Your carbon footprint is the amount of carbon dioxide and other carbon compounds emitted, because of your use of fossil fuels.

Hope this helps!

Answer:

helium

Explanation:

because there are no electrons screening it from the nucleus