Describe how to make pure dry crystals of magnesium chloride from magnesium
carbonate and a dilute acid.
In your method you should name the apparatus and reagents you plan to use.

(8 Marks)

Answer:

1.571 J/g°C

Explanation:

Using Q = mc∆T

Where;

Q = amount of heat in Joules

m = mass of substance (grams)

c = specific heat capacity

∆T = change in temperature (°C)

According to the question;

m = 140g, Q = 440J, ∆T = 22°C - 20°C = 2°C

Using Q = mc∆T

c = Q/m∆T

c = 440/ 140 × 2

c = 440/280

c = 1.571 J/g°C

Answer:

covalent bonding becaus of there both non metals

Answer:multiple periods of warmer, and there are natural cycles or warmer.

Explanation: trust me

Answer:

cation ca2+ anion cl-

Explanation:

please see the picture your answer is there

Answer:

C = 43.96

Explanation:

Formula:

C = 2πr

    r = 14/2 = 7

C = 2(3.14)(7)

C = 43.96

Answer:

where is the options

Explanation:

give options

Answer: 19 dollar fortnite card Explanation:who wants it

If a balanced reaction takes place in a sealed container, how should the mass before the reaction begins compare to the mass after the reaction ends will always be equal to the reactant or same.

A balanced reaction or chemical reaction is that the amount or mass of the reactant will always be equal to the amount of the product after the reaction is complete.

If A and B are two reactant then their concentration will be equal to the product which is C and D the number of moles taking participate is also equal.

Therefore, a balanced reaction takes place in a sealed container,  the mass before the reaction begins compare to the mass after the reaction ends will be equal as reactant or will be the same.

Learn more about balanced reaction, here:

https://brainly.com/question/14263388

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Answer:

No

Explanation:

This is because light cannot not whiten Jayden's teeth but light can change materials by hearing it up. There are some substances or tooth paste that can be use to whiten the teeth because of the content they are made off which whitens the teeth. Some of it include baking soda, hydrogen peroxide toothpaste, tumeric toothpaste, toothpaste that contain fluoride.

warm air rises because of convection.

A student holds the back of his hand near an iron to see if it's hot. The heat transfer is conduction.

Warm water moves throughout a mattress because of ... why is there warm water in a mattress again? Convection, I guess.

In a swimming pool, the water near the surface is warmer because of convection and solar radiation; it's closer to the Sun than the bottom of the pool, so it receives more thermal radiation, making it warmer.

Answer:

4

Explanation:

it has 4 oxygen

hope this helps

Answer:

The law companies that value excessive ethics comply with the legal guidelines not solely in letter however go past what

Answer:

For d I'm pretty sure its Organ System, I apologies if I am wrong

Answer:

two oxygen atoms

Answer:Heat is a transfer of energy due to a temperature difference. Enthalpy is the change in amount of heat in a system at constant pressure. You can only use heat and enthalpy interchangeably if there is no work being done to the system.

Explanation:

the answer to your question is C

Answer:

[tex]\boxed {\boxed {\sf 9.63 \ mol \ Na_2SO_3}}[/tex]

Explanation:

To convert from molecules to moles, Avogadro's Number: 6.02*10²³ must be used. This number is the amount of particles (molecules, atoms, etc.) in 1 mole of a substance. In this case, the particles are molecules of sodium sulfate. Let's create a proportion.

[tex]\frac{ 6.022 *10^{23} \ molecules \ Na_2SO_3}{1 \ mol \ Na_2SO_3}[/tex]

Multiply by the given number of molecules.

[tex]5.80 *10^{24} \ molecules \ Na_2SO_3 *\frac{ 6.022 *10^{23} \ molecules \ Na_2SO_3}{1 \ mol \ Na_2SO_3}[/tex]

Flip the fraction so the molecules of sodium sulfate cancel.

[tex]5.80 *10^{24} \ molecules \ Na_2SO_3 *\frac{ 1 \ mol \ Na_2SO_3}{6.022 *10^{23} \ molecules \ Na_2SO_3}[/tex]

[tex]5.80 *10^{24} *\frac{ 1 \ mol \ Na_2SO_3}{6.022 *10^{23}}[/tex]

[tex]\frac{ 5.80 *10^{24} \ mol \ Na_2SO_3}{6.022 *10^{23}}[/tex]

Divide.

[tex]9.63135171 \ mol \ Na_2SO_3[/tex]

The original measurement has 3 significant figures (5, 8, and 0), so our answer must have the same.

For the number we calculated that is the hundredth place. The 1 in the thousandth place tells us to leave the 3.

[tex]9.63 \ mol \ Na_2SO_3[/tex]

There are about 9.63 moles of sodium sulfate

Answer:

119

Explanation:

because the molecular mass of MBr can be found by adding the individual atomic masses of the molecule

Molar mass of M + 4(Molar mass of Br)= Molar mass of

MBr

Molar mass of M +4(80)= 439

Molar mass of M +320 = 439

Molar mass of M = 439 -320

Molar mass of M =119

Answer:

146 neutrons.

Explanation:

Answer:

Water decreases the viscosity of magma, which is basically how thick or runny a liquid is.

Sun-Bleached hair.

You can't exactly pass down piano skills, they have to be taught and also you can't just be born with strong muscles, they also have to develop over time. Height can't exactly be passed down because some parents are tall and their kids come out short. That leaves the only other option to be Sun-Bleached Hair (hair color).

Hope this helps and have a nice day.

-R3TR0 Z3R0

Answer:

I can’t see the whole page

Explanation:

Answer:

hello some part of your question is missing below is the missing part

1. Mass of water in the boiler 336.6g 2. Mass of wax burn 0.289g 3. Increased in the temperature 6.6 C

and change to Joules and to kilojoules

answer : 9.295 kJ

Explanation:

Calculate how much energy was released by the combustion of the wax

ΔT = 6.6°C

Note :The energy released by the combustion of wax is absorbed by the water

heat = mass * specific heat capacity * ΔT

        = 336.6 * 1 * 6.6  = 221.56 cal

convert;  221.56 cal to J

           = 221.56 * 4.184 = 9295.0 J

hence the energy released by the combustion of the wax = 9.295 kJ

Answer:

It explains how continents have shifted over time and It was developed based on data that scientists collected about  the ocean floor.

Answer:

sodium chloride

Explanation:

Answer:

4.658 * 10^22 atoms

Explanation:

Mass = 25 g

Number of atoms = ?

Number of moles = Mass / Molar mass

Molar mass of PbCrO4 = 323.1937 g/mol

Number of moles = 25 g / 323.1937 g/mol

Number of moles = 0.077352993 moles

1 mol = 6.022 * 10^23 atoms

0.077352993 mol = x

Solving for x;

x = 0.077352993 * 6.022 * 10^23  / 1

x = 4.658 * 10^22 atoms