Please help :)
It’s a science thing for 7th grade

Please Help :) Its A Science Thing For 7th Grade

Answers

Answer 1

Answer: The first question is chemical The second one is Physical

Explanation:


Related Questions

If 2 moles of salt is dissolved to form 1 liter of solution, what is the molarity of the solution?

Answers

Answer:

2M

Explanation:

Molarity refers to the molar concentration of a solution. It can be calculated by using the formula as follows:

Molarity (M) = number of moles (n) ÷ volume (V)

Based on the information provided in this question, 2 moles of salt is dissolved to form 1 liter of solution. This means that n = 2mol, V = 1L

Molarity = n/V

Molarity = 2/1

Molarity = 2M

I have to re ask this but pls help me I don't have a lot of time

Answers

Answer:a

Explanation:

Answer:

Hello there!

If i'm doing this correctly it is A (125 g).

Hope that helped, if I wasn't correct feel free to tell me.

Have a great day!

Which type of a reaction is best represented by the equation - AB + CD → AD + BC?

Answers

Answer:

AB + CD → AD + BC

Explanation:

This is a double displacement reaction. It is also known as precipitation reaction.

Will award brainliest! Between which two ionization energies would you expect to see the biggest jump for calcium? A. 11-12
B. 12-13
C. 13-14
D. 14-15

Answers

answer:lettter B that is answer

Which body systems is your blood a part of? Your answer ​

Answers

cardiovascular system( im so sorry if it was wrong)

Which ion concentration does the pH scale measure? How long is the scale?

Answers

7 which is neutral ranges from 0-14

What controls the movement of material between the inside of the cell and the outside world?

Group of answer choices

Nucleus

Cell membrane

Cytoplasm

Vacouoles

Answers

The answer is Cell membrane

Answer:

Cell membrane

Explanation:

Ammonia (NH3) dissolved in water is heated in a beaker. If initially there had been 60 grams dissolved in 100 grams of water, what would happen if the temperature reached 90℃ and why? A. The solution would become supersaturated and the ammonia would all remain dissolved . B. The solution would become saturated but the amount of ammonia dissolved would remain the same . C. about 50 more grams of ammonia would be able to dissolve as the solution has become unsaturated . D. about 50 grams of ammonia would come out of solution as the temperature caused the solubility to decrease .

Answers

Answer:

C. About 50 more grams ammonia would be able to dissolve as the solution has become unsaturated

Explanation:

From the question, we have;

The mass of ammonia dissolved in water = 60 grams

The mass of the water solvent which dissolves the ammonia = 100 g

The temperature to which the ammonia water solution is raised = 90°C

Therefore, given that the solubility of a solute in a solvent increases with temperature, when the temperature is raised, we have, that the solution will more unsaturated and will be able to dissolve more ammonia, therefore, option 'C' is the most correct option that corresponds with the relationship of temperature and solubility

Describe a sodium (Na) atom and a chlorine (Cl) atom

Answers

Answer:

Both in group 1

Explanation:

Sodium is a very reactive metal

Chlorine is a very reactive non metal

Both have one Valence electron

formation of ionic bond is affected by​

Answers

Answer:

Ionization energy, electronegativity, and lattice energy are the factors that influence the formation of ionic bonds of elements.

ASAP!!!
As current flows through a system, what happens to the voltage available at each load?

Answers

Answer:

The relationship between Voltage, Current and Resistance forms the basis of Ohm's law. In a linear circuit of fixed resistance, if we increase the voltage, the current goes up, and similarly, if we decrease the voltage, the current goes down.


Location closer to the
equator receives less energy
from the sun.

True or false

Answers

Answer: true

Explanation:

Hope this helps

When we look at a plant we notice that the leaves are green this is due to the

Answers

Actually If you look very close to a plant you see this:

And to answer your question leaves are green due to sun nutrients water and im not sure  what else

A student makes observations about a piece of copper. Which
observation describes a chemical property of the copper? (*hint: anything
relating to "measurements" of something is a physical property) *
A. it has a mass of 63.546 grams
B. corrosion occurs when it is exposed to air
C. it has a density of 8.96 g/cm^3

Answers

Answer: b

Explanation:

Science, please help and thank you!!

Answers

Swings hope this helps

Write a balanced equation for the complete combustion of propane gas, C3H8, with
oxygen, O2, to form carbon dioxide, CO2, and water, H2O?

Answers

Answer:  

Explanation:

Balancing Carbon atoms on the right side,

Balancing Hydrogen atoms on the right side,

Balancing Oxygen atoms on the left side,

The reactants are on the left side of the reaction:

Propane and oxygen are the reactants.

The products are on the right side of the reaction:

Carbon dioxide and water are the products.

forgive me if im incorrect or leaving things out

What happends when you put m&ms in warm water for 2-3 minutes ​

Answers

Answer:

The m & m logo floats off of it. Its a fun experiment. I did it before

Explanation:

Hope that helped

If 95 grams of Iron are needed to react with sulfur, how many grams of sulfur are involved in this reaction?
2 Fe + 3 S=Fe2S3

Answers

Answer:

82 g S

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 81.6 grams of sulfur are involved in this reaction.

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

2 Fe + 3 S[tex]\rightarrow[/tex]Fe[tex]_2[/tex]S[tex]_3[/tex]

mass of iron = 95 grams

Molar mass of iron=55.8450 g/mol

number of moles of iron =Given mass÷ Molar mass of iron

number of moles of iron=95÷ 55.8

number of moles of iron=1.70 moles

The mole ratio between iron and sulfur is 2:3

moles of sulfur = (3/2) moles of iron

moles of sulfur = (3/2)×1.70

moles of sulfur=2.55 moles

Mass of sulfur= number of moles of sulfur× Molar mass of sulfur

                       =2.55× 32

                       =81.6g

Therefore, 81.6 grams of sulfur are involved in this reaction.

To know more about mole, here:

https://brainly.com/question/15209553

#SPJ2

Through photosynthesis, plants use the energy in sunlight to convert water and
carbon dioxide into sugar and oxygen. Has a chemical or physical change occurred?
Explain your answer.

Answers

Answer:

chemical change occured


Calculate the number of moles in 85.0 g of carbon tetrafluoride (CFA).

Show Your Work

Answers

what element is A??????

Calculate the number of grams of nitrogen dioxide that are produced from 4 moles of nitric oxide

Answers

Answer:

hope this help by the way found off of yahoo

Explanation:

Calculate the number of grams of nitrogen dioxide that are produced from

4 moles of nitric oxide.

2NO(g) + O2(g) -->2NO2(g)

I really need help with this... I need to know how to work it too... I can balance it out but not sure about grams...  This is it balanced out with 4 moles of nitric oxide

4NO(g) + 2O2(g) ->4NO2(g) please help and explain i want to learn this

Colin decided to investigate soil erosion by water. He measured rates of erosion on
model hills made of soil, rock, and sand. Which of the following was the test
(independent) variable?

Answers

Answer:

i just had a test on this with 2 attempts and got it wrong on both but i do know that the answer is not...

the steepness of the models hillside

or

the rate of erosion on the hills

so the answer is either...

the amount of water sprayed on the hills

or

the type of material used to construct the model hills

but i think its the amount of water sprayed on the hills...i hope i helped a lil ;)

Explanation:

The double bonds in an aromatic ring are not fixed in position as in an alkene. The electrons are considered to be ____ and are delocalized around the ring.

Answers

Answer: The double bonds in an aromatic ring are not fixed in position as in an alkene. The electrons are considered to be in conjugation and are delocalized around the ring.

Explanation:

Chemical compounds that have conjugated planar ring systems where there are delocalized pi-electron clouds are present in place of individual alternate and single bonds.

This means that electrons present in a double bond of alkene are in conjugation.

Therefore, we can conclude that the double bonds in an aromatic ring are not fixed in position as in an alkene. The electrons are considered to be in conjugation and are delocalized around the ring.

Answer:

In resonance

Explanation:

Got it right on Acellus.

yo fm on ig chs_luucy. ill give u brainleist .

Answers

Alright bet! Say less

Answer:

this is a homework app, not a tell people to follow your ig app

Explanation:

Please help with q2

Answers

A. It is counterproductive
B. Vinegar
C. Ammonia

Please give me Brainliest

A) Vinegar is an Acid solution while, Ammonia is a basic solution, so when they react they form a neutral solution,

Therefore this is a neutralization reaction

B) The lower the pH value of a solution, the more acidic it is, and vise versa for basic,

In the table Vinegar has the lowest pH value, of 3. Therefore Vinegar is the most acidic in the table

C) The higher the pH value of a solution, the more basic it is

In the table Ammonia has the highest pH value of 12. Therefore Ammonia is the most basic in the table

Happy to help :)

If you need any more help, you can ask me

Different substances have....
A.the same properties
B. different properties
C.similar properties
D.all properties​

Answers

Answer:

Different properties

Explanation:

They are different.

Which of the following lines from the story indicates a flashback?

Answers

Is there any picture?
Higitdixoxkgxkgxhochk

What is the relationship between atmospheric
pressure and vapor pressure at the boiling point of
a liquid?

a. The atmospheric pressure is equal to the
vapor pressure at the boiling point.

b. The atmospheric pressure is less than the
vapor pressure at the boiling point.

C. The atmospheric pressure is greater than
the vapor pressure at the boiling point.

d. Both Band C are correct.

Answers

correct me if I’m wrong but I believe that the answer A

What type of substance do these statements describe?

- It is a long chain.
- It contains carbon, hydrogen, and oxygen atoms.
- It has double bonds.
- It is insoluble in water.
- It is used for energy storage in living things.

carbohydrate
lipid
monosaccharide
protein

Answers

Answer:

lipid

Explanation:

I just know the answer i don't really have a explanation sorry

Answer:

lipid

Explanation:

edge 2021

please ive been stuck on this one forever​

Answers

Answer:

Melting-Solid-Liquid-Added

Freezing-Liquid-Solid-Removed

Vapourization-Liquid-Gas-Added

Condensation-Gas-Liquid-Removed

Sublimation-Solid-Gas-Added

Deposition-Gas-Solid-Removed

Explanation:

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