What is the molarity of a solution containing 18.2 g of KCl in 215 mL of KCl solution?

The atmospheric conditions at a particular time.

i did the test.

Answer:

the atmospheric conditions at a particulur time

Explanation:

Answer:

In general, atomic radius decreases across a period and increases down a group. ... Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.

Answer:

Q1 = C * m * dT

Q2 = Qm * m

Qtotal = Q1 + Q2

Q1 - is amount of energy you need to apply to heat oxygen from the current temperature till you reach the melting temperature. Only if the oxygen is below to melting temperature.

C - is calorific capacity of oxygen -- better look at tables, it is a constant value

m - is the amount of oxygen, we will use moles because the other data shows moles, but could be grams, kg, etc.

dT - is the diference of temperatures between the current and the melting one. The melting temperature is constant and you can find it on tables, then (Tm - To)

Q2 is the amount of energy you have to add to melt oxygen once the oxygen has reached the melting temperature (Tm)

Qm is a constant value you could find on tables, depends on the mass of oxygen and is due to internal processes as changes in atomic distributions

If the oxygen is initially at melting temperature (melting point) you only need to know Q2, as dT = 0

I will do an example for you, but in future you should provide data of constants, it takes very long to find them in books or internet.

Data from tables

Tm =  54.36 K

C = 29.378 J/mol K this is at 25 C (or 298 K), is not really correct, you should look at its value at less than 54.36 K, but you can use it here.

Qm = 0.444 kJ/mol

Problem -- you have 44.33g of Oxygen -- Molecular weight of O2 is 32 g/mol

So you have 44.33/32 = 1.385 moles of oxygen

a) if oxygen is already at melting temperature: you only have to melt it

Qtotal = Q1 + Q2 = [0 (dT = 0) + Qm * m] = 0.444 * 1.385 = 0.615 kJ = 615 J

b) supposing an initial temperture of 50 K: now you have to heat oxygen till melting temperature and then melt it.

Q1 = C * m * dT = 29.378 * 1.385 * (54.36 - 50) = 177.442 J

Q2 = Qm * m = 615 J

Qtotal = 177.442 + 615 = 792.44 J

Explanation:

Answer:

In this case, 1 mole of liquid oxygen requires 3.41 kJ of heat in order to perform that liquid → solid. your sample from grams to moles by using oxygen's molar mass.

Answer:

A.

............

Explanation:

Ductility

Answer:

B- heat from an oven

Explanation:

temperature isn’t energy

Answer:

565 kJ

Explanation:

[tex]H_v[/tex] = Heat of vaporization of water at 100°C = 2260 J/g

m = Mass of water = 250 g

Heat required is given by

[tex]Q=mH_v[/tex]

[tex]\Rightarrow Q=250\times 2260[/tex]

[tex]\Rightarrow Q=565000\ \text{J}[/tex]

[tex]\Rightarrow Q=565\times 10^3\ \text{J}[/tex]

[tex]\Rightarrow Q=565\ \text{kJ}[/tex]

The heat required to vaporize the water is 565 kJ.

Answer:

sulfuric acid ..............

Answer:

F2

Explanation:

F2 is the only element with only 1 element and eveything else is formed by 2 non-metals

Answer:d I believe

Explanation:

Answer:

you are correct, the answer is 2 g

Answer:

copper nitrate

Explanation:

copper nitrate

Answer:

Copper (ll) nitrate or C

Explanation:

Answer:

d. IF3

Explanation:

The Octet rule posits that atoms gain, atom lose, or share electrons in order to have a full valence shell of 8 electrons. This statement occurs when atoms also combine to form molecules until they attain or share eight valence electrons either by losing or gaining eletrons.

From the given options, a valid Lewis structure that cannot be drawn without violating the octet rule is IF3

Answer:

2 moles.

Explanation:

2NaOH + H2SO4 -->  Na2SO4 + 2H2O

This shows that 2 moles of NaOH give 1 mole of Na2SO4.

So 4 moles produces 2 moles of Na2SO4.

Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. The correct option are option A,C.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

Therefore the correct option are option A,C.

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The number of moles of  Al₂ O₃ : 0.2

The reaction equation is the chemical formula of reagents and product substances  

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products  

Reaction

2Al(s) + 3FeO(s) ⇒ 3Fe(s) + Al₂ O₃(s)

0.6 mol of Fe = 0.6 mol of FeO

mol of Al₂ O₃ :  mol of FeO = 1 : 3

[tex]\tt \dfrac{1}{3}\times 0.6=0.2[/tex]

Answer:

0, 1, 2, 3

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define quantum number

Principal Energy Level n = 4

Step 2: Define ℓ

ℓ is the Angular Momentum. Its values start at 0, 1, 2, 3...

It is the Principal Energy Level n minus 1 (n - 1).

Step 3: Find

n = 4

ℓ = 4 - 1 = 3

Therefore, out angular momentum values can be 0, 1, 2, 3. These correlate to s, p, d, f sublevels.

Answer:

8

Explanation:

Answer:

I think it would be b

Explanation:

Answer:

56500J

Explanation:

Given parameters:

Mass of water  = 25g  = 0.025kg

Temperature of the water  = 100°C

Unknown:

Amount of heat required to vaporize the water  = ?

Solution:

The amount of heat required to vaporize the water is a function of the mass of the water and the latent heat of vaporization of water.

         H = mL

H is the amount of heat

m is the mass

L is the latent heat of vaporization of water = 22.6 x 10⁵J/Kg

  H  = 0.025 x 22.6 x 10⁵ = 56500J

Answer:

the answer is C acid dissolving limestone

Explanation:

Answer:

the answer is C acid dissolving limestone

Explanation:

The chemicals in the water break down the rocks, so water breaking rocks is an example of chemical weathering :) Also, acids are a form of chemical weathering, as the chemicals dissolve the limestone :) Hope this helped!!

Answer:

7.5 x 10^14 Hz

Explanation:

Explanation:

The number of orbitals in the sublevels are given below:

     Sublevels                   Orbitals

        s                                  1

        p                                 3

        d                                 5

        f                                   7

a. ls       -  1 orbital

b. 5s      - 1 orbital

c. 4d     - 5 orbitals

d. 4f       - 7 orbitals

e. 7s       - 1 orbital

f. 3p       - 3 orbitals

g. Entire 5th principal energy level : for s, p ,  f  

          1 + 3 + 5 + 7 + 9  = 25

h. 6d   - 5

Answer:

Chemical Equation: (NH4)2S(aq) + 2KOH(aq) -> K2S(aq) + 2NH4OH(s)

Complete Ionic Equation: 2NH4^+(aq) + S^2-(aq) + 2K^+(aq) 2OH^-(aq) -> 2K^+(aq) + S^2- (aq) + 2NH4OH(s) 2NH4^+(aq) + OH^-(aq) -> NH4OH(s)

Explanation:

Ammonium sulfate and potassium hydroxide interact in this process to produce aqueous potassium sulfate, gaseous ammonia, and liquid water as byproducts. In essence, an acid-base reaction is taking place here, with the ammonium ion contributing a hydrogen ion to the potassium hydroxide's hydroxide ion.

Chemical formulae and symbols are used to express a chemical reaction in a chemical equation.

A chemical equation represents a chemical reaction using symbols and the chemical formulas of the reactants and products involved. In this process, ammonia and hydrochloric acid are reacting to generate ammonium chloride. For solids, the symbol is (s).

( NH₄ ) 2S ₍ aq ₎ + 2KOH ₍ aq ₎ ⇒ K₂S ₍ aq ₎  + 2NH₄

Thus, Aqueous solutions of ammonium sulfide and potassium hydroxide are mixed to formed potassium sulphide and ammonia.

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Answer:

A test variable is a user-defined, name-value pair that stores and refers to information throughout a test and between tests. For example, in a study looking at how tutoring impacts test scores, the dependent variable would be the participants' test scores, since that is what is being measured...

The control group is defined as the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do. For example, The control group is used in an experiment as a way to ensure that your experiment actually works. Your experimental group would be given the Gatorade and your control group would be given regular water. The conditions must be exactly the same for all members of the experiment.

A limiting factor is anything that constrains a population's size and slows or stops it from growing. Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources. Limiting factors are usually expressed as a lack of a particular resource.

Infectious agents commonly spread through the direct transfer of bacteria, viruses, or other germs from one person to another. This can happen when an individual with the bacterium or virus touches, kisses, or coughs or sneezes on someone who isn't infected.

Explanation:

Answer:

2LiCl + 3O2  

Explanation:

Answer:

(C) 2LiCl + 3O2

Explanation:

sub to pewds

The speed of the car at each checkpoint cannot be determined because the parameter is not given.

For a moving car, the speed can be defined as the change magnitude in the position of a car or the distance traveled by the car within a specified time.

Mathematically;

[tex]\mathbf{speed = \dfrac{distance}{time}}[/tex]

From the information given; the distance at each checkpoint can be calculated by finding the difference in distance between the previous checkpoint and subsequent checkpoint divided by the change in time.

i.e

[tex]\mathbf{speed = \dfrac{d_A - d_B}{\Delta t}}[/tex]

where:

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answer is below           .     .     .

Answer:

Energy

Explanation:

Nuclear fusion is the process of combining atoms to make heavier atoms. This releases a huge amount of energy and it is what stars like our sun use to create energy.

Answer:

5.3 mol CO₂

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

3.2 × 10²⁴ molecules CO₂

Step 2: Convert

[tex]3.2 \cdot 10^{24} \ mc \ CO_2(\frac{1 \ mol \ CO_2}{6.022 \cdot 10^{23} \ mc \ CO_2} )[/tex] = 5.31385 mol CO₂

Step 3: Check

We are given 2 sig figs. Follow sig fig rules.

5.31385 mol CO₂ ≈ 5.3 mol CO₂