18 pointssssssssssss help plz :)

Answer:

ndcuffaStuff that restrains you from something or someone basicially handcuffs or shackles

Explanation:

Answer:

a limitation or restriction.

OR

stiffness of manner and inhibition in relations between people.

Answer:

Make high energy molecules for the cell to function.

Explanation:

Remember mitochondria is the storehouse of the cell.

Hope it helps!

Answer:

b) 2.0 mol

Explanation:

Given data:

Number of moles of Ca needed = ?

Number of moles of water present = 4.0 mol

Solution:

Chemical equation:

Ca + 2H₂O     →      Ca(OH)₂ + H₂

now we will compare the moles of Ca and H₂O .

                          H₂O        :        Ca                

                             2           :        1

                             4.0           :       1/2×4.0 = 2.0 mol

Thus, 2 moles of Ca are needed.      

Answer:

True

Explanation:

Answer:

It's A: Weak & Vulnerable

what will happen of sodium and water react(be careful)

make slime

make chapathi and paneer butter masala

Answer: d) 16.34 grams

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]  

[tex]\text{Moles of} N_2O_5=\frac{31.5g}{108.01g/mol}=0.292moles[/tex]

The balanced chemical reaction given is:

[tex]4N_2+5O_2\rightarrow 2N_2O_5[/tex]  

According to stoichiometry :

As 2 moles of [tex]N_2O_5[/tex] are produced by= 4 moles of [tex]N_2[/tex]

Thus 0.292 moles of [tex]N_2O_5[/tex] are produced by=  =[tex]\frac{4}{2}\times 0.292=0.584moles[/tex] of [tex]N_2[/tex]

Mass of [tex]N_2=moles\times {\text {Molar mass}}=0.584moles\times 28g/mol=16.34g[/tex]

Thus 16.34 g of [tex]N_2[/tex] will be needed

Answer:

burning paper

Explanation:

i think its burning paper.

Answer:

That`s tough for me to answer, but the definition is to retain, or require heat or energy to make a function of process. I would think it is fireworks, because a chemical reaction is required to produce the effects, but each answer retains heat in some way. I would still choose fireworks though. Hope that helps . . .

Answer:

a risk to human health or the environment arising from biological work, especially with microorganisms.

Explanation:

Answer:

Fe2O3 - S

PbO2 - D

PbO - I

Fe2O - U

Fe(OH)3 - H

FeO2 - T

FeO - R

Pb2O - G

Pb(OH)2 - O

FeOH - N

Pb(OH)3 - A

Explanation:

In writing the formula of ionic compounds we consider the valency or oxidation state of each ion.

For instance, given the compound iron II oxide. The oxidation states of both iron and oxygen are +2 and -2 respectively. Ignoring the charges, this cancels out and we have FeO as the correct formula of the compound.

For Iron III oxide, the oxidation states of iron and oxygen are +3 and -2 respectively, the both atoms exchange charges. If we ignore the signs and write the exchanged numbers as subscripts we obtain the formula Fe2O3.

Answer:

4 elements carbon hydrogen nitrogen and oxygen are present in alanine.

Explanation:

Its formula is C3H7NO2 which show all above 4 elements

Answer:

Sn(C2H3O2)2

Explanation:

C2H3O2 is Acetate

Sn is tin

Acetate has a -1 charge

In order for tin to have a +2 charge, we need two acetates

So we write it as (C2H3O2)2

You just leave Sn blank because of the roman numeral and since it is a transition metal.

So the answer is Sn(C2H3O2)2

Answer:

[tex]\boxed {\boxed {\sf Sn (C_2 H_3 O_2)_2}}[/tex]

Explanation:

First, find what tin and acetate is.

Next, find the charge on acetate, which is -1.

The Roman Numeral 2 in parentheses after tin (II), signifies that the tin has a charge of +2.

We need to balance the charges, so they will equal 0.

The best way to balance is by using 2 acetate molecules

If we want 2 acetate molecules, we must add a subscript of 2 after acetate.

Add the tin (Sn) in front

The formula for tin (II) acetate is Sn (C₂H₃O₂)₂

Answer: They always have the same functional groups.

Explanation:

use quizlet too if you have toooo

Answer:

they have same physical properties is not true

Answer:

CuSO4 + 2NH4OH -----> Cu(OH)2 + (NH4)2SO4

Explanation:

Answer:

The pressure should be 21 atm. You can change units if needed

Explanation:

use the forumla PV=nRT. To figure out pressure you need to divide by the volume on each side. the put the apporite units into the formula and Bam. u got it

Answer:

0.93 mol

Explanation:

Given data:

Number of moles of Na atom = ?

Number of atoms = 5.60× 10²³

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

5.60× 10²³ atoms ×  1 mol / 6.022 × 10²³ atoms

0.93 mol

Answer:

c, maybe d, and I think b.

Explanation:

Im sorry if wrong

Answer:

it it B

Explanation:

He has to be sure to bring enough material (bricks, concrete, steel etc.) so that when the building is finished, it turns out LONG enough to reach all the way from the roof down to the ground.

If there is any gap left, it would be very difficult for the people who work in the offices to get up into the building. Then it could be a complete waste,

The relationship which best describes weathering and erosion is that

Weathering breaks down rock while erosion carries it to a new location.

Weathering involves the breaking down of rock particles into smaller units

which later forms the soil components.

Erosion involves washing away or movement of the uppermost layer of the

soil to a new location/place and an example is the movement of soil

particles when water from rainfall or wind is present.

Read more on  https://brainly.com/question/20075916

Answer:

ammonia: NH₃

Explanation:

The product is ammonium nitrate, with the chemical formula NH₄NO₃. This salt is composed of the cation NH₄⁺ and the anion NO₃⁻

Nitrate (NO₃⁻) is formed from the strong acid called nitric acid: HNO₃.

Ammonium ion (NH₄⁺) is formed from the weak base ammonia: NH₃.

Thus, the chemical reaction for the formation of the salt is the following:

HNO₃ + NH₃ ⇒ NH₄NO₃

This is a single displacement reaction. In this reaction, Iron reacts with aqueous solution of copper chloride, which is blue in colour.

The Iron being more reactive, reduces the copper from its solution to make Iron Chloride, which is green in colour. Fe + CuCl₂ → FeCl₂ + Cu. This is also a redox reaction in which CuCl₂ is a reducing agent and Fe is an oxidising agent. 

Thus, the reaction between Iron and Copper sulphate is a redox displacement reaction.

Learn more about Displacement reactions:

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Disclaimer: The question was incomplete. The correct question can be:

In the reaction between Fe and CuCl₂, the following statement is true:

A) It is a single displacement reaction.

B) It is a combination reaction.

C) It is a decomposition reaction.

D) It is a double displacement reaction.

Writing each number in full form, we have;

We know that scientific notation affords us the opportunity to write numbers in a  manner that is shorter and saves space by the use of exponents.

We shall now try to write each number in the full form;

Learn more about scientific notation:https://brainly.com/question/18073768

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Answer:

1.85 x 10^ -5

Explanation:

largest freshwater body on Earth by volume, at 5666 mi³

1 mi³= 4.168  ×  10^12 L

5666 mi³ = 5666 × 4.168 × 10^12 L

  volume   = 2.362 × 10^16 L

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Answer:

[no2]- it have 1 negative charge

O-N=O

this Single bond O having negative charge because oxygen need 2 electrons to complete its octet and it have only one bond to complete its octet it having one more electron and this one one more electron creates 1 negative charge on this compound

Answer:

Natural gas

Explanation:

Natural gas is a gaseous fossil fuel produced from organic matter that is used to heat homes and cook food.

Natural gas is one of the most volatile part of hydrocarbons that exist together with fossil fuel.

Answer:

B. Color change

3&5

hope this helps <3

have a great day/night

-Dan

Answer:

b its radiant energy that heats up the earth.

Explanation:

Answer:

The answer is D

Explanation:

Heat from the Earth's core and radiation from the Sun is transferred to the surface of the Earth by conduction. The warm land and water radiates infrared, some of which is absorbed by the atmosphere, adding to its thermal energy.

Answer:

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