CHEMISTRY HIGH SCHOOL

Which equation represents a neutralization reaction? A. 4Fe(s) + 3O2(g) → 2Fe2O3(s) B. 2H2(g) + O2(g) → 2H2O() C. HNO3(aq) + KOH(aq) → KNO3(aq) + H2O() D. AgNO3(aq) + KCl(aq) → KNO3(aq) + AgCl(s)

Answers

Answer 1
Answer:

Answer : The correct option is, (C)

Explanation :

A.4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)

This is synthesis reaction in which the two or more reactant react to give a single product.

B.2H_2(g)+O_2(g)\rightarrow 2H_2O(l)

This is combination reaction in which the two reactants combine to form a single product.

C.HNO_3(aq)+KOH(aq)\rightarrow KNO_3(aq)+H_2O(l)

This is a neutralization reaction in which an acid react with a base to give a salt and water as a product.

D.AgNO_3(aq)+KCl(aq)\rightarrow KNO_3(aq)+AgCl(s)

This is a double displacement reaction in which the positive cation and negative anion of two reactants exchange their places to give two new products.

Hence, the reaction (C) is a neutralization reaction.
Answer 2
Answer: The equation represents a neutralization reaction is HNO3(aq) + KOH(aq) → KNO3(aq) + H2O(). The answer is letter C. A. 4Fe(s) + 3O2(g) → 2Fe2O3(s), 2H2(g) + O2(g) → 2H2O() and AgNO3(aq) + KCl(aq) → KNO3(aq) + AgCl(s) are not neutralization reaction.

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An isotope remains unchanged by the emission of a gamma ray, which is a(n) __________.

Answers

Answer:

The answer to your question is photon. An isotope remains unchanged by the emission of a gamma ray, which is a (an) photon123. A photon is a particle of light or electromagnetic radiation that has no mass and no electric charge4. A gamma ray is a type of photon that has the highest energy and frequency in the electromagnetic spectrum4. Gamma rays are emitted by the nuclei of some radioactive atoms when they undergo a nuclear rearrangement or decay4. Gamma ray emission causes no change in the number of particles in the nucleus, meaning both the atomic number and mass number remain the same23. Therefore, an isotope does not change its identity or mass when it emits a gamma ray, but only releases some excess energy as a photon. I hope this answer helps you understand the concept of gamma ray emission better.

An igneous rock originally has 3 grams of uranium 238 in it. When dated the rock only contains 1.8 grams. What are the parent and daughter concentrations (in percentages) and what is its age?

Answers

Answer :

The parent and daughter concentrations (in percentages) is, 60 % and 40 % respectively.

The age of rock is 3.32* 10^9\text{ years}

Explanation :

First we have to calculate the parent and daughter concentrations (in percentages).

\text{Parent concentrations}=(1.8g)/(3g)* 100=60\%

and,

\text{Daughter concentrations}=((3-1.8)g)/(3g)* 100=40\%

As we know that, the half-life of uranium-238 = 4.5* 10^9 years

Now we have to calculate the rate constant, we use the formula :

k=(0.693)/(t_(1/2))

k=\frac{0.693}{4.5* 10^9\text{ years}}

k=1.54* 10^(-10)\text{ years}^(-1)

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

t=(2.303)/(k)\log(a)/(a-x)

where,

k = rate constant  = 1.54* 10^(-10)\text{ years}^(-1)

t = time passed by the sample  = ?

a = initial amount of the reactant  = 3 g

a - x = amount left after decay process = 1.8 g

Now put all the given values in above equation, we get

t=(2.303)/(1.54* 10^(-10))\log(3)/(1.8)

t=3.32* 10^9\text{ years}

Therefore, the age of rock is 3.32* 10^9\text{ years}

The best tool to use to locate the boundaries between countries is a(n) _____.interrupted area map
political map
population map
relief map

Answers

The correct answer is (b) political map

The explanation:

when a political map: is different than other types of maps because it focuses on government or administrative boundaries rather than geographical or physical features. Instead of showing viewers what exists in the land, it shows those imaginary lines that serve to separate countries, states, territories, and cities. These maps generally include larger bodies of water, such as oceans, rivers, and lakes, as landmarks.

It was made by man not natural like the others maps.

so this is the correct answer.

Final answer:

A political map is the best tool to locate the boundaries between countries, providing distinct and accurate depiction of governmental boundaries.

Explanation:

The best tool to use to locate the boundaries between countries is a political map. Political maps are designed to show governmental boundaries of countries, states, and counties.

They also indicate the location of major cities, and they usually include significant bodies of water.

Unlike other types of maps like interrupted area maps, population maps, or relief maps, a political map focuses specifically on the delineation of imaginary lines separating different political entities, making it the ideal tool for identifying country boundaries.

Learn more about Political Map here:

brainly.com/question/28838482

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Approximately how many elements are there that combine chemically in a great number of ways to produce compounds? A. 25 B. 50 C .75 D.100

Answers

Answer:

The correct answer is D.

Explanation:

A chemical compound is any substance composed of identical molecules formed by atoms of two or more chemical elements. All matter in the universe is composed of atoms of more than 100 different chemical elements. These elements are found in pure form and combined form in chemical compounds.

Have a nice day!
100 as there’s approximately 100 discovered elements

After doing multiple titrations, your NaOH solution is determined to have a mean concentration value of 0.100 M. Given you are to assume your unknown acid is 75.0% KHP, how many grams of your unknown will you need to use 15.00 mL of your 0.100 M standardized NaOH

Answers

Answer: The mass of unknown acid needed is 0.230 grams

Explanation:

To calculate the number of moles for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}

Molarity of NaOH solution = 0.100 M

Volume of solution = 15.00 mL = 0.015 L    (Conversion factor:  1 L = 1000 mL)

Putting values in above equation, we get:

0.100M=\frac{\text{Moles of NaOH}}{0.015L}\n\n\text{Moles of NaOH}=(0.100mol/L* 0.015L)=0.0015mol

The chemical reaction for the reaction of KHP and NaOH follows

KHC_8H_4O_4(aq.)+NaOH\rightarrow KNaC_8H_4O_4(aq.)+H_2O(l)

By Stoichiometry of the reaction:

1 mole of NaOH reacts with 1 mole of KHP.

So, 0.0015 moles of NaOH will react with = (1)/(1)* 0.0015=0.0015mol of KHP

  • To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of KHP = 0.0015 moles

Molar mass of KHP = 204.22 g/mol

Putting values in above equation, we get:

0.0015mol=\frac{\text{Mass of KHP}}{204.22g/mol}\n\n\text{Mass of KHP}=(0.0015mol* 204.22g/mol)=0.306g

We are given:

Mass of unknown acid = 75 % of Mass of KHP

So, mass of unknown acid = (75)/(100)* 0.306=0.230g

Hence, the mass of unknown acid needed is 0.230 grams

How much 0.05 M HCl solution can be made by diluting 250 mL of 10 M HCl?

Answers

if,
10M:250ml
0.05M:Xml
10X=0.05×250
10X=12.5
X=1.25ml
Hope this helps*wink*
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