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Answer:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

Answer: 2 Na (s) + Cl(g) -> 2 NaCl (s)

Explanation:

Answer:

Roasting s'mores over a fire.

Ironing the wrinkles out of my shirts.

Wet clothes are dried with the hot air of the dryer.

Small speakers in your headphones use electricity and moving magnets to create sound waves.

Explanation:

Answer:

80.5 atm

Explanation:

First of all, we convert 28.0 °C and 50.0 °C into K:

To answer this problem we'll use Gay-Lussac's Law, which states that:

In this case:

We put the data:

And solve for P₂:

Thus, the correct answer is 80.5 atm.

Answer:

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Answer: the answer is 0

Explanation:A stable atom has a net charge of 0. In other words, it has an equal number of protons and electrons. The positive protons cancel out the negative electrons.

Answer:

Thorium disulfate

Explanation:

Thorium also forms insoluble compounds with fluoride, sulfate, ... hydroxide from solutions of pH 3.6 or above. ... rate should be about 2.5 g/min, and the reaction tube temperature ... thenoyl group decreases the solubility of the reagent in the aqueous

Answer:

569K

Explanation:

Q = 3.5kJ = 3500J

mass = 28.2g

∅1 = 20°C = 20 + 273 = 293K

∅2 = x

c = 0.449

Q = mc∆∅

3500 = 28.2×0.449×∆∅

3500 = 12.6618×∆∅

∆∅ = 3500/12.6618

∆∅ = 276.4220

∅2 - ∅1 = 276.4220

∅2 = 276.4220 + ∅1

∅2 = 276.4220 + 293

∅2 = 569.4220K

∅2 = 569K

When the temperature is increased, there is the increase in thermal energy of the system. The final temperature of the iron in kelvins is 570 K.

The energy is the ability to do work.

Given is the energy Q = 3.5 kJ = 3500 J, mass of sample m = 28.2 g, specific heat of iron Cp = 0.449 J(g•K).

The initial temperature in kelvins is T1 = 20°C = 20 + 273 = 293K

The heat is related to the temperature difference as

Q = m c ∆T

Substitute the values into the expression,

3500 = 28.2 × 0.449 × ∆T

3500 = 12.6618 × (T2 -T1)

T2 - T1 = 276.4220

T2 = 276.4220 K +293 K

T2 = 569.4220K

The temperature of the iron is approximately 570 K.

Thus, the final temperature of the iron in kelvins is 570K.

Learn more about energy.

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Answer:

C. Mole

Explanation:

Chemical formula deals with mole number

Answer:

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Explanation:

Answer:

The short term human induced environmental changes are pollution and deforestation. The term deforestation can be defined as the cutting down of trees in huge amount. The reason can be cutting down of trees for human settlement. Pollution can be defined as the undesirable in the environment.

Answer: 0.360 moles

Explanation:

To calculate the moles :

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

[tex]\text{Moles of} FeCl_3=\frac{38.9g}{162.2g/mol}=0.240moles[/tex]

The balanced chemical reaction is:

[tex]2Fe+3Cl_2\rightarrow 2FeCl_3[/tex]  

According to stoichiometry :

2 moles of require = 3 moles of

Thus 0.240 moles of [tex]FeCl_3[/tex] will require=[tex]\frac{3}{2}\times 0.240=0.360moles[/tex] of [tex]Cl_2[/tex]

Thus 0.360 moles of chlorine needed to react to produce 38.9 of iron (III) chloride.

Answer:

4 valence electrons

Despite the fact that the word silicon has a ubiquitous affiliation with all things electronic, Si itself is not a good electrical conductor. It has 4 valence electrons, meaning that filling its outer shell it can form a very strong lattice with 4 neighboring Si atoms-with no un-bonded electrons remaining

Answer:

The numer of valence electrons is defined as the number of electrons present in the outer most shell of the atom.So, in the case if selenium, there are 6.

Answer:

The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH. [H3O+] = 10-pH or [H3O+] = antilog (- pH) Example: What is the hydronium ion concentration in a solution that has a pH of 8.34? On a calculator, calculate 10-8.34, or "inverse" log ( - 8.34).

Explanation:

Hope it helps!

Answer:

I don't get what you want me to do cause n Explano questions showing ation:

Answer:

I think it was a huge fish. umm not sure

Explanation:

B: 2

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Answer:

Ionically, because they are ionic compounds

Answer: The final molarity of a 20mL- 1.3M salt solution after it has been diluted with 100ml water is 0.22 M

Explanation:

According to the dilution law,

[tex]M_1V_1=M_2V_2[/tex]

where,  

[tex]M_1[/tex] = molarity of stock solution = 1.3  M

[tex]V_1[/tex] = volume of stock solution = 20 ml  

[tex]M_1[/tex] = molarity of diluted solution = ?

[tex]V_1[/tex] = volume of  diluted solution = (20+100) ml = 120 ml

Putting in the values we get:

[tex]1.3\times 20=M_2\times 120[/tex]

[tex]M_2=0.22M[/tex]

Therefore  the final molarity of a 20mL- 1.3M salt solution after it has been diluted with 100ml water is 0.22 M

Answer:

Do a quick conversion: 1 moles Potassium Chloride = 74.5513 gram using the molecular weight calculator and the molar mass of KCl.

Answer:

Vacuum: space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).-the internet gave me this answer so..

Explanation:

hope this helps :)

Answer:

Explanation:

Answer:

The main function sis the 2nd one and the substance provides the first 1.

Explanation:

Hope you finish the rest on your own, have fun!