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4 years ago

Atomic radius

1 answer:

7 0

The correct answer is B. The atomic radius decreases across a period but increases down a group. The periodic table is arranged in order to predict certain properties of the elements across a period or down a group. Aside from the atomic radius, other trends include electron affinity, ionization energy, electronegativity and metallic character.

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Which statement best describes a chemical reaction?

ziro4ka [17]

Answer:

In a chemical reaction, one or more substances called reactants are combined or broken down to form products.

Explanation:

Chemical reaction:

In a chemical reaction one or more substance converted into the another substance.

The substances that reacts or combine during the chemical reaction are called reactants while the new species formed as a result of chemical reaction are products.

There are different types of reaction given below:

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

Synthesis reaction:

It is the reaction in which two or more simple substance react to give one or more complex product.

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AC +BD

7 0

4 years ago

For the reaction below, an analysis of an equilibrium mixture isperformed at a certain temperature.

DerKrebs [107]

Answer:

k = 3.2 x 10¹¹

Explanation:

The equilbrium taking place is:

N₂(g) + 3Cl₂(g) ↔ 2NCl₃(g)

And the expression for the equilbrium constant k is

k = [NCl₃]² / ( [N₂] * [Cl₂]³)

We are given all the required data from the problem, so now we solve for k:

k = (1.9x10⁻¹)² / ( (1.4x10⁻³) * (4.3x10⁻⁴)³ )

k = 3.2 x 10¹¹

5 0

4 years ago

When 55.8 g of Fe reacts with Cl2 according to the equation 2Fe + 3Cl2 --> 2FeCl3. How many moles of Cl2 are required to reac

harkovskaia [24]

Answer:

1.50 moles

Balanced equation: 2Fe + 3Cl₂ --> 2FeCl₃

find moles of iron:

moles = mass/Mr

moles = 55.8/56

moles = 0.9964 moles

use molar ratio:

2Fe : 3Cl₂

2 : 3

moles of Cl₂ = (0.9964/2)*3 = 1.50 moles

8 0

3 years ago

Which of the following is true about an ionic compound?

Genrish500 [490]

D. all of the above because ionic compound is a salt. it is also held together by ionic bonds. it has anions and cations

3 0

3 years ago

Read 2 more answers

Watch the animation and observe the titration process of a standard 0.100 M sodium hydroxide solution with 50.0 \rm ml of a 0.10

yuradex [85]

Answer:

Answers are in the explanation

Explanation:

a. The statments are:

The titration process is based on a chemical reaction. TRUE. A titration is the chemical reaction between an acid and a base.

The pH of the solution at the equivalence point is 7. TRUE. In a titration of strong acid with strong base the equivalence point is 7

At the endpoint, the pH of solution is 10 and the color of solution is pink. FALSE. The endpoint in a strong acid - strong base titrationmust be near to equivalence point at pH = 7.

At the beginning of the titration process, the pH of the solution increases rapidly. FALSE. At beginning of a titration, the pH of the solution increases slowly.

The chemical reaction involved in an acid-base titration is a neutralization reaction. TRUE. In the reaction, you are neutralizing an acid (HCl) with a base (NaOH)

Before any base is added to the solution, the pH of the solution is high. FALSE. The addition of a base increases pH that is, in the beginning, low.

In a titration process, the endpoint is reached before the equivalence point. FALSE. In a titration process, the endpoint is reached in the equivalence point

The pH of the solution changes very slowly at the equivalence point. FALSE. At the equivalence point, the pH changes rapidly.

b. For the reaction

NaOH + HCl → H₂O + NaCl

As the reaction is 1:1 and molarity of both solutions are the same, additions < 100mL of NaOH will stay before the equivalence point, equivalence point will be in 100mL and additions > 100mL of NaOH will stay after the equivalence point.

The conditions are:

10.0mL of 1.00 M NaOH before the equivalence point

150 mL of 1.00 M NaOH after the equivalence point

5.00 mL of 1.00 M NaOH before the equivalence point

50.0 mL of 1.00 M NaOH before the equivalence point

200 mL of 1.00 M NaOH after the equivalence point

I hope it helps!

7 0

3 years ago

Read 2 more answers