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Explanation:

Ni + 2KCl → 2K + Nicl2

It form

potassium and nickel chloride.

Answer:

The temperature will be 384.7 K

Explanation:

Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is maintained at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .

In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Having an initial state 1 and a final state 2, the following is true:

[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{33.9 L}{285.4 K} =\frac{45.7 L}{T2}[/tex]

Solving:

[tex]T2=45.7 L*\frac{285.4 K}{33.9 L}[/tex]

T2= 384.7 K

The temperature will be 384.7 K

Answer:

It moves rocks above ground, where they are exposed to more water and wind.

Answer:

When you are exercising, your muscles need extra oxygen—some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing.

Explanation:

The Cl-Cl bond will react more readily because it has a lower bond energy than the C- H bond.

The bond energy refers to the energy required to break the bonds that links two atoms together in a molecule. It is equal to the energy that is evolved when the bond is formed.

In comparing the Cl-Cl bond with the C-H bond, we will find out that the Cl-Cl bond will react more readily because it has a lower bond energy than the C- H bond.

Learn more about bond energy: https://brainly.com/question/26141360

Answer:

Explanation:

1.0

⋅

10

−

7

Explanation:

Start by writing a balanced chemical equation for the partial ionization of the acid

HA

(aq]

+

H

2

O

(l]

⇌

A

−

(aq]

+

H

3

O

+

(aq]

Notice that you have

1

:

1

mole ratios across the board. For every mole of acid that ionizes in aqueous solution, you get one mole of its conjugate base and one mole of hydronium ions,

H

3

O

+

.

In other words, the equation produces equal concentrations of conjugate base and hydronium ions.

Now, you can use the pH of the solution to calculate the equilibrium concentration of the hydronium ions.

pH

=

−

log

(

[

H

3

O

+

]

)

⇒

[

H

3

O

+

]

=

10

−

pH

In your case, the pH of the solution is equal to

4

, which means that you'll have

[

H

3

O

+

]

=

10

−

4

M

By definition, the acid dissociation constant,

K

a

, will be equal to

K

a

=

[

A

−

]

⋅

[

H

3

O

+

]

[

HA

]

The expression for the acid dissociation constant is written using equilibrium concentrations. So, if the reaction produced a concentration of hydronium ions equal to

10

−

4

M

, it follows that it also produced a concentration of conjugate base equal to

10

−

4

M

.

Because the initial concentration of the acid is considerably higher than the concentrations of the conjugate base and hydronium ions, you can approximate it to be constant.

This means that the acid dissociation constant for this acid will be

K

a

=

10

−

4

⋅

10

−

4

0.100

=

1.0

⋅

10

−

7

This is the underlying concept behind an ICE table

HA

(aq]

+

H

2

O

(l]

⇌

A

−

(aq]

+

H

3

O

+

(aq]

I

0.100

0

0

C

(

−

x

)

(

+

x

)

(

+

x

)

E

0.100

−

x

x

x

Here

x

represents the equilibrium concentration for the conjugate acid and hydronium ions. Since you know that

x

=

10

−

4

, you will have

K

a

=

10

−

4

⋅

10

−

4

0.100

−

10

−

4

Once again, you can use

0.100

−

10

−

4

=

0.0999

≈

0.100

to get

K

a

=

10

−

8

0.100

=

1.0

⋅

10

−

7

Answer:

19.32 g/cm³

Explanation:

The density will remain the same no matter how many times you cut the gold.  The density is g/cm³ or g/mL.  Density is essentially how many grams 1 mL of a compound weighs.

Answer:

[tex]\boxed {\boxed {\sf 19.32 \ g/cm^3}}[/tex]

Explanation:

Density is the mass per volume (g/mL or g/cm³). It is an intrinsic property. This means it is not dependent on the amount and all samples of the same substance have the same density.

Therefore, if a piece of gold has a density of 19.32 grams per cubic centimeter and it is cut in half, the two pieces will have the same density.

Answer:

3 moles of Argon

Explanation:

The molar mass for argon is 39.948 g/mol

[tex]\frac{120g}{39.948g/mol} = 3.004molesAr[/tex]

Answer:

0.25 mole of NO2 contains 0.25 mole 'N'

one mole contains   6.023 x 10 ^23 atoms

0.25 mole   II------------------------------>?

            = 0.25 x 6.023 x10^23 = 1.5 x 10^23 atoms

Explanation:

Answer:21 moles of PbCl2 formed

Explanation: 3Pb(NO3)2(aq) + 2AlCl3(aq) --> 3PbCl2(s) + 2Al(NO3)3(aq)

14 moles AlCl3 x 3 moles PbCl2/2 moles AlCl3 =21 moles of PbCl2 formed

The number of moles of PbCl₂ produced when 14 moles of AlCl₃ are consumed in the reaction is 21 moles

3Pb(NO₃)₂ + 2AlCl₃ —> 3PbCl₂ + 2Al(NO₃)₃

From the balanced equation above,

2 moles of AlCl₃ reacted to produce 3 moles of PbCl₂.

From the balanced equation above,

2 moles of AlCl₃ reacted to produce 3 moles of PbCl₂.

Therefore,

14 moles of AlCl₃ will react to produce = (14 × 3) / 2 = 21 moles of PbCl₂.

Thus, 21 moles of PbCl₂ were obtained from the reaction.

Learn more about stoichiometry:

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Answer:

It is C

Explanation:

observation three and option three go togther

Answer:

i'd say D

Explanation:

the dependent variable is the change that happens

Answer:

I'm pretty sure you have it correct

Answer:

noun. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. a region or area characterized by a given climate: to move to a warm climate.

Explanation:

Answer:

Standard acid-base reaction in two stages:

Na2CO3 + HCl → NaHCO3 +NaCl

NaHCO3 + HCl → NaCl + CO2 + H2O

If only a small quantity of acid is added (and the overall solution remains above pH 7), the reaction would stop at stage 1 and you’d be left with an aqueous solution of sodium chloride and sodium bicarbonate. Adding more acid would lead to the bicarbonate being converted to carbon dioxide and water, with the CO2 coming out of solution as a gas and more sodium chloride being produced.

Answer:

Independent Variable: The thing in an experiment which is changed.

Dependent Variable: The thing in an experiment which is affected by the change. (In other words, it's affected by the independent variable.)

Control Variable: The other factors of the experiment that remain unchanged.

For example, say you want to do an experiment about the effects of water on plant height. So, the independent variable, or the thing that is changed would be the amount of water, and the dependent variable would be the plant height, as the plant height is directly affected by the independent variable. Lastly, for this to be a fair experiment, there must be control variables. For example, all of the plants should be put in a room with equal temperature, they should get the same amount of sunlight, etc.

I hope this answers your question- feel free to ask me if you need any more help.

Answer with Explanation:

Lol.. even i was confused before  .. so i learnt now ill help u :

Simple!

See... lets take simple expirament to explain:

My expirament is to verify if sunlight affects the growth of plants ...

So here :

My controlled variable : It is what is held constant.. So ur supposed to NOT it like everything else expect sunlight..(ex: water, soil, type of plant etc)

My Independent variable : Variable that is changed.... So this is wht  u ARE changing to make th expirament ... (for ex: here sunlight u will chanhe... u will put on in a dark room and a nother in the light..)  

My dependetn variabe:l Some thing that changes on is own..cause of the expiramen t... like the result ..(for ex: height , growth of plant etc)

I hope u  understood !!  :))

Answer:

Second one

Explanation:

Answer:its B

Explanation:

You welcome

Answer:

The pH scale measures how acidic or alkaline — basic — something is. Your body works constantly to carefully control pH levels of blood and other fluids. The body's pH balance is also called the acid-base or acid-alkaline balance. The right pH levels are needed for good health.

Answer:

234

Explanation:

so 3 x 3 x 26 =234

i just answered this question and it was actually 1,4,1,2

Answer:

88.2

Explanation:

Answer:

iron is found in the red blood cells of your blood called hemoglobin and in muscle cells called myoglobin. Hemoglobin is essential for transferring oxygen in your blood from the lungs to the tissues.

2( non- metals generally do not react with acids but metals react with acids and produce hydrogen gas that burns with a 'pop' sound. You must have noticed that copper does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric 

Answer:

7.27 grams

Explanation:

Format= starting amount (g)·(1 mol/molar mass)·(amount of wanted/amount of starting)·(molar mass of wanted/1 mol)

[tex]41.0 x \frac{1 mol}{17.031}x\frac{3 H2}{2NH3} x\frac{2.016}{1 mol} =7.27[/tex]

Answer: use big words

Explanation:

Answer:

D

Explanation:

Answer:

the answer is D I did that one in 5th grade

Answer:

[tex]\boxed {\boxed {\sf 2.61 \ mol \ O}}[/tex]

Explanation:

To convert from grams to moles, the molar mass is used. This number tells us the grams per mole of a substance. It can be found on the Periodic Table. Look for oxygen.

Use this number as a ratio.

[tex]\frac {15.999 \ g \ O }{ 1 \ mol \ O }[/tex]

Multiply by the given number of moles.

[tex]41.8 \ g \ O *\frac {15.999 \ g \ O }{ 1 \ mol \ O }[/tex]

Flip the fraction so the grams of oxygen cancel.

[tex]41.8 \ g \ O *\frac { 1 \ mol \ O }{ 15.999 \ g \ O}[/tex]

[tex]41.8 *\frac { 1 \ mol \ O }{ 15.999 }[/tex]

[tex]\frac { 41.8 \ mol \ O }{ 15.999 }= 2.61266329146 \ mol \ O[/tex]

The original measurement of grams has 3 significant figures (4, 1, and 8). Our answer must have the same. For the number we calculated, that is the hundredth place. The 2 in the thousandth place tells us to leave the 1.

[tex]2.61 \ mol \ O[/tex]

41.8 grams of O has 2.61 moles of oxygen.

Write the balanced chemical equation

Calculate the moles of

Na2CrO4

Use the molar ratio from the balanced equation to calculate the moles of

Ag2CrO4

Calculate the mass of

Ag2CrO4

mass of Ag2CrO4 produced is 124 g.

The mass of silver chromate are produced when 250. mL of 1.500 M Na₂CrO₄ are added to excess silver nitrate is 62.028g.

Mass of any susbtance will be calculated by using moles as:
n = W/M, where

W = given mass

M = molar mass

Relation between moles and molarity as:

M = n/V, where

M = molarity

V = volume

Moles of Na₂CrO₄ = (1.5)(0.25) = 0.375 mol

Given balanced chemical reaction is:

2AgNO₃(aq) + Na₂CrO₄(aq) → Ag₂CrO₄(s) + 2NaNO₃(aq)

From the stoichiometry of the reaction it is clear that,

2 moles of Na₂CrO₄ = produces 1 mole of Ag₂CrO₄

0.375 moles of Na₂CrO₄ = produces 1/2×0.375=0.187 mole of Ag₂CrO₄

Mass of 0.187 moles of Ag₂CrO₄ = (0.187mol)(331.7g/mol) = 62.028g

Hence required mass of Ag₂CrO₄ is 62.028g.

To know more about mass & moles, visit the below link:

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Answer:

1. No reaction.

2. ZnCl₂ + H₂

3. CaCl₂ + H₂

Explanation:

1. Cu + HCl —> ___

From the reactivity series of metals, H is higher that Cu in the series and so, Cu can not displace H from solution.

Therefore, no reaction will occur.

2. Zn + HCl —> ___

Zn is higher than H in the activity series so, it will displace H from acid solution to produce hydrogen gas, H₂.

The balanced equation is given below:

Zn + 2HCl —> ZnCl₂ + H₂

3. Ca + HCl —> ___

Ca is higher than H in the activity series so, it will displace H from acid solution to produce hydrogen gas, H₂.

The balanced equation is given below:

Ca + 2HCl —> CaCl₂ + H₂