A 3.00 laqueous solution of koh contains 195 g of koh. The solution has the density of 1.29 g/ml

Answer:

Cl

Explanation:

In a covalent bond between Cl and H, (Cl) tends to attract electron density from the other element in the bond.

Chlorine is more electronegative than hydrogen. In general, elements towards the top-right of the periodic table are more electronegative. This is because these elements are desperate for a few more electrons to fill their outermost shell (and have a full octet). The more electronegative an element is, the more it wants electrons. As a result, highly electronegative atoms have a greater pull on the electrons in a covalent bond.

Answer: Chlorine & Bromine

Explanation:

Answer:

The temperature decreased.

Explanation:

Answer:

The temperature decreased. The air particles inside the tire increase their speed because their temperature rises.

Explanation: The combined gas law states that the pressure of a gas is inversely related to the volume and directly related to the temperature. If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase.

Answer:  How much heat is required to convert 29 g of ice at -4.0 ˚C to water vapor at 105 ˚C (report your answer to three significant figures)? Answer all five parts, showing your detailed calculations: i) Heat to warm ice from -4.0 to 0 oC: ii) Heat to convert ice to liquid: iii) Heat to warm liquid to boiling: iv) Heat to convert liquid to gas

Explanation:

e

Explanation:

Step 1: Write out the chemical formula of the compound.

Magnesium Chloride = MgCl^2

Step 2: Convert moles into number of compounds using Avogadro's number

0.5 moles MgCl^2 ⋅(6.022⋅10^23 - 1 mole MgCl^2)= 3.011⋅ 10^23

Step 3: Determine how many Chloride ions there will be in 1 compound

There will be 2 Cl− ions in each compound (Cl^2 part)

Step 4: Multiply the number from Step 2 by the number in Step 3

3.011 ⋅ 10^23 ⋅ 2= 6.022 ⋅ 10^23

We do this because the ratio is 2 Cl− ions for every 1 compound.

In the case of finding how many ions in general (both sodium and chloride), we would multiply by 3 because there are 3 ions per 1 compound.

I hope this helped!

Explanation:

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Answer: 1.5mol NH3

Explanation: 1N2+3H2= NH3

                      0.5 mol N2x 3NH3/1molN2= 0.5x3= 1.5mol NH3

Answer: Arsenic

Explanation:

Arsenic is in column 15 of the periodic table, which means that it has 5 valence electrons.

Answer:

It would be true cause the example of gas would be coke soda

Explanation:

Answer:

341m/s

Explanation:

because speed is given by the product of frequency and wavelength, so mathematically we can write ( v=f×lambda)... so in this case we can say speed=170.5×2= 341m/s

:.speed of the wave= 341m/s

Answer:

410

Explanation:

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Answer:

1.Begin energy in kilojoules.

2.Use a conversion factor in convert kilojoules to joules .

3.Use a conversion factor top convert

Answer:

how was enacting the GI bill Like teaching someone how to fish

Atoms of the same chemical element do not always have the same mass because, although the number of protons in the nucleus is the same for all atoms of the same element, the number of neutrons is not. Most elements as they occur naturally on earth are mixtures of several isotopes

hope this will help

Answer:

Answer:

T-cells are made to identify antigens, while inflammation fights anything in the affected area.

Explanation:

virus antigen on an infected cell fits into the Killer T-cell receptor

T-cell releases perforin and cytotoxins.

Perforin first makes a hole infected cell membrane

Cytotoxins go inside the cell through this hole, destroying it and any viruses inside

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Answer:

The electron configuration of a Ca2+ ion is 1s22s22p63s23p6

Explanation:

Answer:

1s², 2s², 2p⁶, 3s², 3p⁶

Explanation:

The general configuration for a regular Calcium atom is :

1s², 2s², 2p⁶, 3s², 3p⁶, 4s²

But it mentions it is a Ca²⁺ ion.

This means it has lost 2 electrons.

Therefore, the configuration is :

1s², 2s², 2p⁶, 3s², 3p⁶

From the calculation and the data provide, the mass of NaCl is about 115 g.

The term reaction refers to the combination of two or more substances to yield a product.

The equation of the reaction is; F2 + 2NaCl ----->Cl2 + 2NaF

Number of moles of F2 reacted is obtained from;

PV = nRT

n = PV/RT

n =  1.50 atm. * 15.0 l/0.082 atmLK-1mol-1 * 280

n = 22.5/22.9

n = 0.98 moles

If 1 mole of F2 reacts with 2 moles of NaCl

0.98 moles of F2 reacts with 0.98 moles * 2 moles/1 mole

= 1.96 moles

Mass of NaCl = 1.96 moles * 58.5 g/mol = 115 g

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Answer:

14500.

Explanation:

1) Avlgadro's number is 6.022*10²³;

2) 1 mol is 6.022*10²³ atoms of Hellium, then 8.7*10²⁷ atoms is

[tex]3) \ \frac{87*10^{26}}{6*10^{23}}=14.5*10^3=14500[moles].[/tex]

Answer:

Tetrahedral

Explanation:

Because there is one central atom (C) and 4 surrounding atoms, you can assume that the molecular shape is tetrahedral. However, it is important to add the valence electrons and assign them to each of the atoms to make sure there are no double/triple bonds or lone pairs. This could change the shape.

C = 4 v.e.

F = 7 v.e.

Cl = 7 v.e.

4 + 2(7) + 2(7) = 32 total valence electrons

There are 6 lone pairs around each outer atom and two electrons in each bond.

(6 electrons x 4 outer atoms) + (2 electrons x 4 bonds between atoms) = 32 electrons

This adds up to the total valence electrons. Carbon wants 8 valence electrons. This is satisfied by the 4 bonds between it and the outer atoms. The outer atoms want 8 valence electrons as well. This is satisfied by the 6 electrons (in the form of lone pairs) and 1 bond between them and carbon.

Answer:

If 3.4 moles of carbon dioxide (CO2) form at the end of the reaction, 1.7 moles of oxygen gas

(02) and 3.4 moles of carbon monoxide (CO) entered the reaction

Explanation:

The rule of three or is a way of solving problems of proportionality between three known

values and an unknown value, establishing a relationship of proportionality between all of

them. That is, what is intended with it is to find the fourth term of a proportion knowing the

other three. Remember that proportionality is a constant relationship or ratio between different

magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so

does the other (or when one magnitude decreases, so does the other), the direct rule of three

must be applied. To solve a direct rule of three, the following formula must be followed:

ab

cx

So

C*b

T =

a

In this case, it is possible to use the reaction stoichiometry of the reaction (that is, the

relationship between the amount of reagents and products in a chemical reaction) and the rule

of three to calculate the quantities of moles requested:

.

,

If by stoichiometry 2 moles of CO2 are formed by 1 mol of O2, if 3.4 moles of CO2 are

formed, how many moles of O2 are needed?

molesofo2 = 3.42

=

moles of O2=1.7 moles

• If by stoichiometry 2 moles of CO2 are formed by 2 moles of CO, if 3.4 moles of CO2 are

formed, how many moles of CO are needed?

molesof CO =

=

3.4*2

2

moles of CO=3.4

Commercial agriculture can often lead to water-quality problems in the following ways:

Water quality refers to the state of a water body that encompasses it's physical, chemical and biological characteristics.

The water quality of a water body is crucial to its suitability for domestic or drinking purpose.

Commercial agriculture greatly affects water quality in the following ways:

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Answer:

I think what you are looking for is below

Explanation:

CO2 + 2 NH3 →  (NH2)2CO + H2O

98.382 L

This is tricky! But this is my awnswer! :) Hope it helps

The new pressure of the gas that initially have a pressure of 853.0 millibars at a temperature of 29.0 °C is 1011.17 millibars. Details about pressure can be found below.

The pressure of a given gas can be calculated using the following formula:

P1/T1 = P2/T2

Where;

853/302 = P2/358

358 × 853 = 302P2

305374 = 302P2

P2 = 305374 ÷ 302

P2 = 1011.17 millibars

Therefore, the new pressure of the gas that initially have a pressure of 853.0 millibars at a temperature of 29.0 °C is 1011.17 millibars.

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Answer:

Not sure.

Explanation:

Give me some time.

Answer:

The s stands for the phase of that element or compound. The phase solid is represented by (s). In this problem it is saying solid sodium (Na) is reacting with Bromine (Br) gas to form sodium bromide.

Explanation:

Answer: D may be equal to, greater than, or less than the total amount of the reactants.

Explanation:

Answer:

The answer is option D

Explanation:

At equilibruim, the total amount of the products may be equal to, greater than, or less than the total amount of reactants.

The equilibrium constant (Keq) is given for the reversible reactions. The concentration of hydrogen iodide will be 1.58 M.

The equilibrium constant (Keq) is the proportion of the ratios of the concentration of the products to the reactants.

The balanced chemical reaction is shown as:

2HI  ⇔ H₂ + I₂

The equilibrium expression for the reaction can be given as:

Keq = [H₂] [I₂] / [HI]²

Given,

Equilibrium constant = 1.6 × 10⁻⁴

Concentration of dihydrogen = 2  × 10⁻³ M

Concentration of iodine = 2 × 10⁻³ M

The concentration of hydrogen iodide is calculated as:

1.6 × 10⁻⁴ = [ 2  × 10⁻³ M][2  × 10⁻³ M] ÷ [HI]²

[HI]² = 4  × 10⁻⁶ ÷ 1.6 × 10⁻⁴

= 2.5 M

[HI] = 1.58 M

Therefore, 1.58 M is the concentration of hydrogen iodide.

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