Chemistry College

Which of the following shows correctly an ion pair and the correct formula for the ionic compound the two ions form?

A) Cu1+, O2–; CuO

B) Cr3+, I–; CrI

C) Sn4+, N3–; Sn4N3

D) Fe3+, O2–; Fe2O3

Which Of The Following Shows Correctly An Ion Pair And The Correct Formula For The Ionic Compound The

Answers

Answer 1

Answer:

D) Fe³⁺, O²⁻; Fe₂O₃

Explanation:

Option D shows correctly an ion pair and the correct formula for the ionic compound the two ions form.

Ion pairs of iron and oxygen react to form iron (III) oxide. The iron (III) oxide is one of the oxides of iron. The compound is usually attacked by acids and it is often called rust. It is used in the feedstock of the steel and iron industries. This means that the compound is used in the production of iron, steel, and many alloys.

Below are some equations:

4 Fe + 3 O₂→ 2 Fe₂O₃

Fe⁰ + 3O₂⁰ →  Fe³⁺O₃²⁻

Related Questions

One of the waste byproducts of a nuclear reactor using uranium-235 is strontium-90 with half-life of about 28 years. If we have 100 pounds of this radioactive waste:

Answers

Answer:

(a) 140 years

(b) 3.125 pounds

Explanation:

QuestIons

(a) How long is five half-life

(b)  How much radioactive strontium is left after five half-life

Given that:

Half-life is about 28 years; &

There are 100 pounds of this radioactive waste

Five half-life will be;

= 28 × 5

= 140 years

The amount of radioactive remaining after five half-life is:

[tex]= 100 \times( \dfrac{1}{2}) ^5[/tex]

= 100 × 0.03125

= 3.125 pounds

If atomic size is the distance from the nucleus to the valence electrons, does the size of the atom get bigger or smaller as you go from period 1 to 3? Explain?

Answers

Smaller the atomic size get smaller as it goes across a period. This is because periods all have the same amount of valence electron shell numbers (like period 2 has 2 valance shells around the atom) but at the same exact time, the number of protons increase going down the period. This means there’s more/a stronger pull from the protons to the outer balance electrons making the valance electron layers pull inward more, but on the next layer of new balance electron shell is formed so the distance between the outer most balanced electron in the protons is wider than the previous level, but like before the gap decreases as a you go down the period. Hope this makes sense

Which of the following best describes the difference between a mixture and a pure substance? A. A mixture has the same properties throughout; a pure substance has the different properties throughout. B. A mixture has different properties throughout; a pure substance has the same properties throughout A mixture is made up of only one type of atom; a pure substance is made up of more than C. one type of atom. A mixture is made up of more than one type of atom; a pure substance is made up of only D. one type of atom.​

Answers

Answer:

B. A mixture has different properties throughout; a pure substance has the same properties throughout

Explanation:

We have two classes of substances which are pure and impure substances.

Pure substances are elements and compounds

Impure substance are simply mixtures.

Mixtures have the following properties;

Their composition is indefinite i.e. they consist of two or more elements and or compounds in any proportion by mass. Constituents retain their identities i.e. physical properties are retained. Constituents react differently to changed conditionsThey can easily be separated by physical methods.

d Which properties of plastics cause a problem when the container is empty?​

Answers

Answer: Both of these are of great concern to human health. BPA is used in many things including plastic bottles and food packaging materials. Over time the polymer chains of BPA break down, and can enter the human body in many ways from drinking contaminated water to eating a fish that is exposed to the broken down toxins.

Explanation:

I think you will get it

Can anyone solve this?

Answers

Answer:

3P2O5:

P:6 O:15

5CO2

C:5 O:10

3C6H12O6

C:18 H:36 O:18

4C6H12

C:24 H:48

3Mg3(PO4)2

Mg:9 P:2 O: 8

4(NH4)2S

N:8 H:32 S:4

the ATOMIC WEIGHT OF ALUMINUM (AL) is 26.98. It has 14 neutrons. Aluminum has ?


a. an atomic mass of 13

b. an atomic number 13

c. 26 electrons

d. 26 protons

I believe b. an atomic number 13. is the answer.

Answers

B is correct please thank me by pressing heart

The atomic weight of Aluminum (AL) is 26.98. It has 14 neutrons. Aluminum has  an atomic number 13. Therefore, option B is correct.

What is atomic number?

The atomic number of an element represents the number of protons in the nucleus of its atoms. Since the atomic number of an element is unique and determines its position in the periodic table, aluminum has an atomic number of 13.

The number of electrons in a neutral atom is equal to the number of protons, which in this case is 13. Therefore, aluminum has 13 electrons.

The atomic weight of aluminum (Al) is 26.98, which represents the weighted average mass of all the naturally occurring isotopes of aluminum, taking into account their relative abundances. The number of neutrons in an atom of aluminum is given as 14.

Thus, the correct option is B.

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Question 5
2 pts
To determine the density of an irregularly shaped object, a student immersed the object in 32.2 mL of water in a graduated cylinder, causing the level of the water to rise to 37.8 ml. If the object had a mass of 12.4 g, what is the density of the object?

O 0.32 g/mL
O 1.4 g/mL
O 3.4 g/mL
O 2.2 g/mL

Help quick right answer gets brainliest !!

Answers

Answer:

Explanation:

2.2 g/mL is the answer.

Which of the following is true if the net force on an object is zero? (1 pt) a. The object must be at rest. b. The object’s speed will decrease. c. The object’s speed will increase. d. The object’s direction of motion can change, but its speed will not. e. None of the above.

Answers

Explanation:

the object must be at rest

How many moles of sulfate ions are in 756.91 mg of iron (III) sulfate?

Answers

Answer:

1 Answer. 1 mole of ferric sulfate contains 2 moles of iron, and 12 moles of oxygen atoms, and three moles of sulfate ions.Sep 29, 2016

Explanation:

Who asked the question “can you split matter forever?”

Answers

Answer:

Of course, what we today call atoms can be divided into more elementary particles, but not that many.

Explanation:

how many elements are found in the third period. A.2 B.18 C.8 D.32​

Answers

Answer:

8

Explanation:

u can find it on ur chemistry book

Answer:

C. 8

Explanation:

Check chemistry textbook

In what way is cellular respiration like breathing?

Answers

Answer:Cellular respiration is not the same as breathing, but they are closely related

Explanation: When you breathe in, you take in the oxygen your cells need for cellular respiration. When you breathe out, you get rid of carbon dioxide that your cells produce during cellular respiration.

I just wanted to say you guys on this app are no help. I have asked 4 question sin the past 1-2 hours and not one has been answered. If you know a lot about Chemistry please help me.​

Answers

What’s the question?

Describe the liquid state of matter and give an example besides water.​

Answers

Liquids. A liquid has a definite volume but takes the shape of its container. Examples of liquids include water and oil. Gases may liquefy when they cool, as is the case with water vapor.

Zuzana tests a common household substance and finds that it has a pH of 3.

What type of substance is in the scenario?

acidic
basic
salt
neutral

Answers

a pH of 3 is acidic! hope this helps:)

a pH of 0-6 is acidic
a pH of 7 is neutral
a pH of 8-14 is basic

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic. The given substance is acidic. The correct option is option A.

What are acid and base?

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base are the solution which releases hydroxide ion OH⁻ ion when dissolved in water. The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

Therefore, the given substance is acidic.  The correct option is option A.

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When [H+] = 4.0 × 10–9 M in water at 25°C, then
Kw =1.0×10–14.
b. pOH = 7.
c. [H3O+] = [OH–].
d. pH= 7
e. A-D are all correct

Answers

Answer:

a. Kw = 1.0 × 10⁻¹⁴

Explanation:

a. Let's consider the self-ionization of water.

2 H₂O(l) ⇄ H₃O⁺(aq) + OH⁻

The ion-product of water (Kw) at 25 °C is:

Kw = [H₃O⁺][OH⁻] = 1.0 × 10⁻¹⁴

c. Considering [H⁺] = [H₃O⁺] = 4.0 × 10⁻⁹ M, the concentration of OH⁻ is:

[OH⁻] = 1.0 × 10⁻¹⁴/[H₃O⁺] = 2.5 × 10⁻⁶ M

b. We can calculate the pOH using the following expression.

pOH = -log [OH⁻] = -log 2.5 × 10⁻⁶ = 5.6

d. We can calculate the pH using the following expression.

pH = -log [H⁺] = -log 4.0 × 10⁻⁹ = 8.4

When [H+] = 4.0 × 10–9 M in water at 25°C, then the [tex]Kw =1.0\times 10^-^1^4.[/tex]

What is dissociation constant?

Kw is the dissociation constant or ionization constant of water.

The self-ionization of water will be

[tex]\rm 2 H_2O(l) = H_3O^+(aq) + OH^-[/tex]

The dissociation constant of the water at 25°C will be

[tex]\rm Kw = [H_3O^+][OH^-] = 1.0 \times 10^-^1^4[/tex]

Thus, the correct option is a. [tex]Kw =1.0\times 10^-^1^4.[/tex]

Learn more about dissociation constant

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Rust has the same properties as iron


True

False

Answers

Answer:

false

Explanation:

Which of the following best defines an allotrope?
Question 1 options:


Crystalline forms


Carbon atoms


Different forms of the same element


Similar bonding arrangements between atoms

Answers

Answer:

hi buddy!! here is ur ans: carbon atoms

The formula for calculating power is work divided by time (power = work + time). What are two ways of stating the same relationship?
work = power + time
nwork s power x time
power
time = work x power
Opower workx time
time
Work

Answers

Answer:

See the answer below

Explanation:

The formula for calculating power is such that;

  power = work/time

Two ways to restate the relationship between the 3 variables would be to make time and work the subject of the formula respectively.

1. When time if made the subject of the formula;

 time = work/time

2. When work is made the subject of the formula;

work = power x time

Can you please answer this for me please?
Which form of energy is stored chemical energy and example of?
A. Kinetic energy
B. Potential energy
C. Gravitational energy
D. Powered energy
WARNING: Sorry I'm only in 5th grade so if you see my level as collage I had to put that because it would not let me put anything else

Answers

Answer:

Well its B im sorry if im wrong.

Explanation:

How many atoms of each element are in the chemical formula NH4NO2?
1 nitrogen, 1 hydrogen, and 3 oxygen
O 1 nitrogen, 4 hydrogen, and 3 oxygen
2 nitrogen, 4 hydrogen, and 3 oxygen
O 5 nitrogen, 1 hydrogen, and 1 oxygen

Answers

5 nitrogen, 1 hydrogen, and 1 oxygen I think

Can someone plz help-

Answers

Answer:

The answer is 3 :)

Answer: 3. a bottle that was broken into many small pieces

1. a metal with 3 valence electrons, used in cans.
2. a period 3 element that will not react naturally.
3. has 5 valence electrons and in period 3.
4. the most reactive metal.

Answers

Answer:

.

Explanation:

1. aluminum

2. argon

3. phosphorus

4. francium

I cant really explain this one

is pure water a solution

Answers

Answer: No because a solution is a homogeneous MIXTURE of two or more substances. Water is a pure substance. It is made of hydrogen and oxygen, but shares none of their properties. So it’s pure.

Explanation:

Which energy source releases the most carbon dioxide?
O solar
O wind
O nuclear
O coal

Answers

Answer:

Coal

Explanation:

Coal is by far the worst emitter, followed by natural gas, with solar, wind and nuclear all low-carbon.

Coal, a non-renewable energy source releases the most carbon dioxide into the atmosphere.

What are energy sources?

Energy sources refers to the various sources in which energy for man's needs are obtained.

There are two types of energy sources:

Renewable energy sourcesNon-renewable energy sources

The non-renewable energy sources such as coal release large amounts of carbon dioxide until The atmosphere.

Therefore, Coal, a non-renewable energy source releases the most carbon dioxide into the atmosphere.

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The density of a gas is 1.35 L what is the volume of the gas when the mass is 12.5 g

Answers

Answer:

9.26 L

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question we have

[tex]density = \frac{12.5}{1.35} \\ = 9.259259...[/tex]

We have the final answer as

9.26 L

Hope this helps you

What is the systematic name of the following compound?
KBr
Choose 1 answer:
Krypton bromide
Krypton(1) bromide
Potassium(1) bromide
Potassium bromide

Answers

Answer: D. Potassium bromide

PLEASE HELP I WILL MARK BRAINIEST ITS TIMED

Answers

Answer:

I assume air pollution.

Explanation:

If you incinerate something, usually fire or some kind of heating element is used. A byproduct of fire and/or burning is smoke, which can pollute the air.

Answer:

A. Air pollution

Explanation:

In the incineration Factories they produce items And Air pollution

The free flow of electrons is responsible for

Answers

Answer:

An electrical phenomenon is caused by flow of free electrons from one atom to another. The characteristics of current electricity are opposite to those of static electricity. Wires are made up of conductors such as copper or aluminum.

Explanation:

from google

The nutrition label shows the total amount of carbohydrates in grams. One gram of carbohydrates provides four calories of energy.



For this food, the number of calories obtained from carbohydrates is
.

Answers

Answer:

Dude you need to provide an image because almost everyone is not gonna know what u talkin about.

Explanation:

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