What ion causes hardness of water?​

Answer:

C.) Argon

Explanation:

This is because ionisation energy increases as we move from left to right in a period. Argon presents in the right most column and Argon is a novel gas and has 8 electrons in outermost orbital. So, it is highly stable. I hope I helped! ^-^

Answer:

ok im eating chips :)

Explanation:

The fumes being released are almost certainly chlorine, which as you have observed, is quite hazardous. Bleach usually contains strong warnings not to mix with any other cleaning chemical, as some of them will tend to rapidly decompose its active ingredient and release a lot of gaseous chlorine

The mass of Zr deposited in the process is 41.4 g.

An electrolytic cell is a chemical cell which produces electrical energy by non-spontaneous chemical processes.

From the question;

Zr^4+(aq) + 4e ------> Zr(s)

We know that;

91 g of Zr is deposited by 4(96500) C

xg of Zr is deposited by (7.92 × 6.16 × 60 × 60) C

xg = 91 g ×  (7.92 × 6.16 × 60 × 60) C/4(96500) C

x g = 41.4 g

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We study gas since reformation in order to

Below are some few gas properties:

Gas reformation is defined production process which builds upon the existing natural gas.

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Answer:

No

Explanation:

not every species take care of their offspring/babies some abandon their babies and leave and some take care of them till they are older

The partial pressure of the remaining gas that was not measured is 0.8 atm.

This is the individual pressure exacted by each gas in the containing vessel. This partial pressure of individual gases make up the total pressure.

Pt = P₁ + P₂ + P₃ + P₄

5 = 1.2 + 2 + 1 + P₄

5 = 4.2 + P₄

P₄ = 5 - 4.2

P₄ = 0.8 atm

Thus, the partial pressure of the remaining gas that was not measured is 0.8 atm.

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Answer:

c) 2.7 g

Explanation:

The first step is to find the moles of aluminum that you're reacting. To do this, you would do

24 g × molar mass of aluminum = 24 g ÷ 26.982 g/mol = 0.8895 mol Al

Then by the balanced equation, you know that every 2 moles of Al will produce 3 moles of H2. This implies that 0.8895 × (3/2) = 1.334 moles of H2 will be produced

Lastly to find the mass of H2 produced, multiply the moles of H2 produced by the molar mass of H2

1.334 mol × (2 × 1.008 g/mol) = 2.69 g ≈ 2.7 g

Based on the effect of temperature on a reaction, a change in temperature affects the rate constant K.

Based on the Arrhenius equation, the y-intercept gives the value of ln A.

From the value of the slope, the value of Ea is 42.1 J/mol.

A change in the temperature of a reaction acts to increase the rate of reaction.

According to the Arrhenius equation, the y-intercept gives the value of ln A.

From the graph; slope = -Ea/R

Ea = -slope/R

Where;

Ea = -(-350)/8.314

Ea = 42.1 J/mol

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Answer:

oxidation numbers

Explanation:

chemical equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while products are the new substances that are formed. The large numbers in front of some of the formulae are called coefficients. These coefficients are used to balance the equation. Chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be equal because matter cannot be created or destroyed

Answer:

1 mole Oxygen = 2 mole hydrogen0.21 mol oxygen = 0.54 mol hydrogenMass of hydrogen = moles  molecularweight

Mass of hydrogen = 0.54  2 Mass of hydrogen = 1.08 grams.

Thus, for reacting with 8.75 grams of oxygen,

1.08 grams of hydrogen is required.

Explanation:

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1. Calcium hydrogen phosphate

2. Iron(II) Hydrogen Sulfate

3. Calcium hydroxide

4. Aluminum chloride hydroxide

Answer:

1.25 moles

Explanation:

You have 2.5 moles of Cl on product side and you need to make that equal on the reactant side. You can see it is Cl2  so you need to half 2.5 by 2 so both sides are equal. 2.5/2=1.25

Answer:

The answer is True.

Answer:

Molarity of solution = 0.727M

Explanation:

Molarity of solution is defined as moles solute per Liter of solution. For the posted problem use M = n/V where n = moles of solute and V = Liters of solution. That is ...

n = 58.9g/180.16g·mole⁻¹ = 0.327 mole (3 sig. figs.)

V = 450.0ml/1000ml·L⁻¹ = 0.450L (3 sig. figs.)

∴ Molarity = n/V = 0.327mole/0.450L = 0.727mol/L = 0.727M

The mass of carbon dioxide that would be produced by the complete combustion of 2.05 moles of sucrose is 1,082.4 g.

The complete combustion of sucrose in excess oxygen is given as follows;

C₁₂H₂₂O₁₁(s) + O₂(g) → CO₂(g) + H₂O(l)

balanced chemical equation is below;

C₁₂H₂₂O₁₁(s) + 12O₂(g) → 12CO₂(g) + 11H₂O(l)

from the reaction above;

1 mole of sucrose ----------> 12 mole of carbon dioxide

2.05 mole of sucrose ------> ?

= 2.05 x 12

= 24.6 moles

1 mole of carbon dioxide = 44 g/mole

24.6 moles = ?

= 24.6 x 44

= 1,082.4 g

Thus, the mass of carbon dioxide that would be produced by the complete combustion of 2.05 moles of sucrose is 1,082.4 g.

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is a disturbance which travel through a medium that enables energy to be transferred from one point to another

Answer:

6

Explanation:

electronic configuration is 2,6.

From electronic configuration we can see that oxygen have 6 electrons in its outermost shell.

Taking into account the reaction stoichiometry, 90.33 grams of SO₂ are formed when 124 grams of iron(II) sulfide are used.

In first place, the balanced reaction is:

4 FeS + 7 O₂ → 2 Fe₂O₃ + 4 SO₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 351.4 grams of FeS form 256 grams of SO₂, 124 grams of FeS form how much mass of SO₂?

[tex]mass of SO_{2} =\frac{124 grams of FeSx256 grams ofSO_{2}}{351.4 grams of FeS}[/tex]

mass of SO₂= 90.33 grams

Then, 90.33 grams of SO₂ are formed when 124 grams of iron(II) sulfide are used.

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The mass percentage of the solution that we have in the question is  5 g.

Percent w/w (weight/weight) concentration is a way to express the concentration of a solute in a solution as a percentage by mass. It represents the mass of the solute in grams per 100 grams of the solution.

Percent w/w concentration is commonly used in industries such as pharmaceuticals, food and beverage, and cosmetics to measure the concentration of active ingredients or additives in their products.

We know that;

%w/w = weight of the solute/Weight of the solution

Let the weight of the solute be x

1 = x/500 * 100/1

1 = 100x/500

500 = 100x

x = 5 g

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Explanation:

Sunlight

Wind

Plants

Those option are an example

of a renewable source

ideal gas

PV=nRT

T = PV/nR

T = 1 x 12/9 x 0.08205

T = 16.25 K

Answer:

Exponential

Explanation:

Exponential means of an increase or becoming more and more rapid

It is true

I hope it's help u

volume of Ni = 25 nL = 25 x 10⁻⁹ L

mol Ni = 25 x 10⁻⁹ L x 1.25 mol/L = 3.125 x 10⁻⁸

mass = mol x Ar Ni

mass = 3.125 x 10⁻⁸ x 59 g/mol

mass = 1.84 x 10⁻⁶ g = 1.84 μg

Answer:

Explanation:

"25.00 nanoliters of a 1.25 mol/L solution" contains

25.00*10^(-9) L * 1.25 mol/L

= 31.25*10^(-9) mol of Ni

Molar mass of Ni is 58.69 g/mol

So 31.25*10^(-9) mol of Ni

= 31.25*10^(-9) * 58.69 g

= 1834.06*10(-9) g

= 1.834*10(-6) g

= 1.834 ug of Ni

There are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.

The number of moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number. That is;

no. of moles = no. of atoms ÷ 6.02 × 10²³

According to this question, there are 5.87 x 10²⁴ atoms of sodium. The number of moles is as follows:

no. of moles = 5.87 x 10²⁴ atoms ÷ 6.02 × 10²³

no. of moles = 0.98 × 10¹

no. of moles = 9.8moles

Therefore, there are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.

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Answer:A fundamental difference is that physics is more focused to finding the universal laws of general processes, whereas chemistry focuses more on details and specific phenomena, such as what is the boiling point of this substance and why.

Explanation: hope it help

Answer:

Boyle's law states that the volume of a fixed mass of agass at constant temperature is inversely proportional to its pressure

Answer:

yes is it is because of the chemical reciation

Explanation:

m

Answer:

Yes this was because of reversable reactions, they added more drops of HCI and KOH which is the steps before they had added less.

Explanation: