Not all reagents work well for all halides. Which reagents are best to identify the following elements?
Cl: a
Br:
I:
a. AgNO3
b. starch
C. NH3
d. Starch and Naoci
e. NaOCL
f. Ca(NO3)2

The molar concentration of the acid, HCl required for the reaction is 0.614 M

We'll begin by writing the balanced equation for the reaction. This is given below:

2HCl + Ca(OH)₂ —> CaCl₂ + 2H₂O

The mole ratio of the acid, HCl (nA) = 2

The mole ratio of the base, Ca(OH)₂ (nB) = 1

Volume of acid, HCl (Va) = 50.6 mL

Volume of base, Ca(OH)₂ (Vb) = 45 mL

Molarity of base, Ca(OH)₂ (Mb) = 0.345 M

MaVa / MbVb = nA/nB

(Ma × 50.6) / (0.345 × 45) = 2

(Ma × 50.6) / 15.525 = 2

Cross multiply

Ma × 50.6 = 15.525 × 2

Ma × 50.6 = 31.05

Divide both side by 50.6

Ma = 31.05 / 50.6

Therefore, the molar concentration of the acid, HCl is 0.614 M

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The molar concentration of the acid is 0.614 mol/L

The balanced chemical reaction for the reaction is

Ca(OH)₂ + 2HCl → CaCl₂ + H₂O

Using CV/C'V' = n/n' where C = molar concentration of hydrochloric acid, V = volume of hydrochloric acid = 50.6 mL = 0.0506 L, n = number of moles of hydrochloric acid = 2, C' = molar concentration of calcium hydroxide = 0.345 M = 0.345 mol/L, V' = volume of calcium hydroxide = 45.0 mL = 0.045 L, n' = number of moles of calcium hydroxide = 1.

Making C subject of the formula, we have

C = nC'V'/n'V

Substituting the values of the variables into the equation, we have

C = nC'V'/n'V

C = 2 × 0.345 mol/L × 0.045 L/(1 × 0.0506 L)

C = 2 × 0.345 mol/L × 0.045 L/0.0506 L

C = 0.03105 mol/0.0506 L

C = 0.614 mol/L

So, the molar concentration of the acid is 0.614 mol/L

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Answer:

Helium is a noble gas and shares many properties with the other noble gases in the last column.

Explanation:

got it right

also it is classified as a noble gas, and hydrogen is a nonmetal so obviously they don't fit together, as the group is for alkali metals which Helium obviously isn't.

Answer:

This would affect the communities that use solar energy greatly, in a negative way.  

Explanation:

If the moon were twice its size, and cast a larger shadow on Earth, the shadow would black out the earth to an almost night time, during the day.  We would have a 24+ hour night, and communities relying on nothing but solar energy would be out of power until the sun was out again.

Answer:

The term matter refers to anything that occupies space and has mass.

Explanation:

Answer:matter

Explanation:

Answer:

646.8

Weight in Newtons can be found by multiplying the mass times the acceleration of gravity.

The mass of the man is 66 kilograms on Earth.

Earth has an acceleration of gravity that is 9.8 meters per square second.

Substitute the values into the formula.

Multiply.  

1 kg * m/s² is equal to 1 Newton, therefore our answer of 646.8 kg *m/s² is also equal to 646.8 Newtons, or N.

The man's weight in Newtons in 646.8 Newtons

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

The acid catalysed hydrolysis of fats yields fatty acids and glycerol which are the constituents of the fatty acid.

Fats are composed of triglycerides. Trigycerides are formed from fatty acids and propane - 1,2,3 - triol. Triglycerides are essential components of the human body.

Hydrolysis involves the breaking up of a substance into its constituents owing to the addition of water, acid or base. The acid catalysed hydrolysis of fats yields fatty acids and glycerol which are the constituents of the fatty acid.

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Answer:

The Answer is  B

Explanation:

I hope this helps ;)

The process by which the organisms give rise to offspring is defined as the reproduction. It is mainly of two types, they are sexual and asexual. The daughter cell DNA is identical to the DNA from the parent cell in asexual reproduction. The correct option is A.

The mode of reproduction in which a new offspring is produced by a single parent is defined as the asexual reproduction. The newly formed individuals are genetically and physically identical to each other. They are called the clones of their parents.

Asexual reproduction occurs in both unicellular and multicellular organisms. This process does not involve any kind of gamete fusion and there is no change in the number of chromosomes either. It will obviously inherit the same genes as the parent.

In asexual reproduction, single parent is involved, the offspring is genetically similar, and this process occurs in a very short time.

Thus the correct option is A.

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Answer:

This is a verified chemical change. On the other hand, if you add red ink to water, it will turn red. However, we would classify that as a physical change. To conclude, color change is a great indicator that change has occurred.

Explanation:

This is since there are examples of color change being an indicator for both of them. For instance, when you heat the blue copper(II) hydroxide solution, you'll eventually end up with a black copper oxide ( Cu O ) solution. This is a verified chemical change. On the other hand, if you add red ink to water, it will turn red. However, we would classify that as a physical change.

To conclude, color change is a great indicator that change has occurred. However, it does not tell you which type of change might have occurred. You will want to use better indicators - like release of heat - to guide you with that.

Hope that helped :)

Answer:

The one you currently picked. The last one i think

Explanation:

Answer:

4) It disrupts the normal excretion of solid wastes.

Answer:

4

Explanation: Took the test

Answer:

A would be the lowest, then C, and B would be the highest.

Explanation:

Elements tend to become more reactive as you move down the periodic table. This happens because the atoms become progressively larger and lose their hold on the outer eletrons more easily.

Answer:

The sun

Explanation:

The sun is the source of energy that provides the boost for electrons during photosynthesis

Answer:

H2 + 3N2 ⇒ 2NH3

Explanation:

Remember when balancing chemical equations you are trying to make sure that each side of the equation has a equal number of atoms, and when one sides number of atoms is odd you need to multiply to get a even number.

H2 + N2 = NH3

N = 1 × 2 = 2

H = 3 × 2 = 6

N = 2 × 1 = 2

H = 3 × 2 = 6

H2 + 3N2 ⇒ 2NH3

Hope this helps.

Answer: 21

Explanation:

Answer:

Mitochondria

Explanation:

The mitochondria is the powerhouse of the cell

The information in a balanced chemical equation shows how many moles of a reactant are involved in the reaction is,

So, option C is correct one.

The chemical equation in which number of each type of atom is equal in both side of the arrow is called balanced chemical equation.

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Answer:

its a

Explanation:

Answer:

9.18 L

Explanation:

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g) What volume of H2(g) is produced when 7.40 g Al(s) reacts at STP?

first write, then balance the equation

Al + HCl-------------> AlCl3 + H2

2Al + 6HCl-----------> 2AlCl3 + 3H2 2 MOLE  

2 moles of Al produce 3 moles of H2

Al is 7.4/27 =

0.27 moles of Al.

this will produce

0.27 X 3/2 moles of H2 =

0.41 moles of H2

PV =nRT

for STP, P = 1 atm, T = 273.2, R IS 0.082

V= (0.41) X 0.082 X 273,2/1 = 9.18 L

CHECK 1 mole of gas at STP has a volume of 22.4 L

0.41 moles then has a volume of 00.41 X 22.4L = 9.,18 L

Answer:C

Explanation:

Answer:

Gravity :)

Explanation:

Answer:

Explanation:

Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in temperature of the reaction mixture.

Answer:

B

Explanation:

Grams and kilograms :)

Answer:

"Acids produce hydrogen ions, H+, in water. Bases produce hydroxide ions, OH-."

Explanation:

Answer:

Explanation:

Acids and bases release what kind of ions in water?

Acids release hydrogen ions,  bases release hydroxide ions.

the cation H+ of acids consisting of a hydrogen atom whose electron has been transferred to the anion of the acid'

the monovalent anion OH− consisting of one atom of hydrogen and one of oxygen

— called also hydroxide ion

Answer:

mole

Originally, a mole was the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12. That number of particles is Avogadro's Number, which is roughly 6.02x1023. A mole of carbon atoms is 6.02x1023 carbon atoms.

Explanation:

Answer:

1. changing from liquid to gas state

Evaporation

2. the combining substances in a reaction

Reactants

3. radiation

Gamma Rays

4. slow oxidation

Rust

5. melting point of water

0˚ C (0 degrees Celsius)

6. a reaction between a substance and oxygen

Oxidation

7. pertaining to the nucleus of an atom

Nuclear

8. to fuse or join together

Fusion

9. rapid oxidation

Burning

10. heat

Thermo-

The change in liquid to gas state is called evaporation.  Evaporating a liquid will energize the molecules and converts them to the gaseous state.

A change in state or phase of a substance is called a physical change where, one state changes to the other like liquid vaporize to form gases.

Thus, first option is matching with 4th one evaporation.

The combining substances in a reaction is called reactants.

One example of radiation given here is gamma rays.

An example of slow oxidation is rusting that is the formation of red iron oxide on corroding metals.

Melting point of water is 0 ⁰C.

A reaction between a substance and oxygen is called oxidation.

A common  term pertaining to the nucleus and of an atom is nuclear.

The process of fusing or joining of two species together is called fusion.

Thermal process are involving rapid oxidation.

Heat is a form of energy where overheating anything causes burning.

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This problem is providing statements whereby an student is pretending to explain a wrongly-classified non-redox reaction via the change in the oxidation numbers the elements undergo as it takes place. It is asked to report where the student went wrong and to determine whether the reaction is redox or not.

In such a way, we can start by saying that the student was right about the +1 on H and -1 on I but just on HI, not on the diatomic gases too, because when the elements act alone in a chemical equation, their oxidation states must be 0 as they are not forming any ions.

Next, we can go over the identification of the reaction as redox, by writing the correct oxidation numbers in the considered chemical equation:

[tex]I_2^0(g)+H_2^0(g)\rightleftharpoons 2H^+I^-(g)[/tex]

Which exhibits an oxidation half-reaction for hydrogen because it changed from 0 to +1 and a reduction half-reaction for iodine because it changed from 0 to -1, and thus, when the oxidation numbers change, we say the reaction is redox.

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