Which of the following is a correct formula unit of an ionic compound?
-Al2F3
-Ca2O
-Ca(OH)2
-KCl2

Answers

Answer 1

Answer:

[tex]Ca(OH)2[/tex]Ca(OH)2

Explanation:

Answer 2

Ca(OH)₂ is the correct chemical  formula unit of an ionic compound.

What is chemical formula?

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Related Questions

The diagram below shows what happens to an atom of uranium-235 when bombarded by a neutron. Which isotope is represented by X in the diagram?

Answers

Answer:

X represents barium - 141 nucleus.

Written as: (141, 56) Ba

Explanation:

In nuclear fission reaction, due to the fact that the process produces more neutrons, a nuclear chain reaction can possibly occurr. Now, a chain reaction is a one whereby the material that begins the reaction will also be one of the products and it can start another reaction.

Now, for the nuclear chain reaction for the fission of uranium-235, its nucleus absorbs a neutron after which it splits into a krypton - 92 nucleus and a barium - 141 nucleus. Thereafter it releases three more neutrons.

Thus, X is the image represents barium - 141 nucleus.

(141,56) Ba

Consider the equation:

Ca+O2→CaO

What needs to be done in order to balance the equation?


Place a 2 in front of the Ca and the CaO.

Place a 2 in front of the O2 and the CaO.

Place a 2 in front of the CaO only.

Place a 2 only in front of the Ca.

Answers

the first one would be the best answer

How much eat is absorbed when 50.0g of water changes from 25.0 Celsius to 37.0 Celsius?

Answers

27 I think beacuse if you subtract
4.186 j/g. X 50g x (37-25) =
2,511 joules or 2.5 kilo joules
Or 2.38 btu


4.186 is specific heat of water per gram per deg C at sea level
Times mass of 50 grams
Times delta T of the water


2530 joules when cross checked by plugging into an online calculator

help please I will give brainliest to the best answer

Answers

Answer:

the correct answer is D

the answer is D !!!!!!

How do slab pull forces affect plate motion? Choose the correct answer.


Uplifted mantle causes plates to move apart.

Convection currents drive the plate downward to move it.

Earthquakes break the crust into smaller plates to make motion easier.

The weight of the subducted plate produces a force to continue moving the plate.

Answers

Answer:

The weight of the subducted plate produces a force to continue moving the plate.

Explanation:

Sorry, I have another question! Please answer as soon as possible:)

Answers

Answer:

I think its b

Explanation:

Sorry if wrong! Hope this helps tho! maybe mark me brainliest if I am?

define open and closed circuit​

Answers

Answer:

An open circuit is one where the continuity has been broken by an interruption in the path for current to flow. A closed circuit is one that is complete, with good continuity throughout. A device designed to open or close a circuit under controlled conditions is called a switch.

Open circuit allows current to pass through
Closed circuit doesn’t allow current to pass

I will pick the brainiest answer! Thanks! :)

1. What is volume displacement? Why would you use this method?

2. What is density? What happens to things that are denser? What happens if they are less dense?

Answers

Answer:

1. The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid or to that fraction of the volume below the surface of an object partially submerged in a liquid. The weight of the displaced portion of the fluid is equivalent to the magnitude of the buoyant force.

Why would you use this method?

So it can be used to accurately measure the volume of the human body and other oddly shaped objects by measuring the volume of fluid displaced when the object is submerged.

2. Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

What happens to things that are denser?

Students should realize that if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float.

What happens if they are less dense?

The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.

What is an ionic compound? Describe and give an example.

Answers

An ionic compound is a chemical compound of ions held together by electrostatic forces termed ionic bonding
EXAMPLE -/Sodium chloride ,NaCl with Na+and Ci- ions

Answer:

Ionic compounds are compounds made up of ions. These ions are atoms that gain or lose electrons, giving them a net positive or negative charge. Metals tend to lose electrons, so they become cations and have a net positive charge. Ions of opposite charge are held together by very strong ionic bonds within the compound.

Explanation:

My explanation is above with the answer

Use the periodic table to write the electron configuration of gallium (Ga).
Drag the labels to the correct locations on the image. Each label can be used more than once.

Answers

Answer:

Explanation: It’s the correct answer on Edmentum.

How does a balanced chemical equation demonstrate conservation of mass?

Answers

Answer:

A balanced chemical equation will demonstrate the law of conservation of mass because the amount of elements on one side (reactants) will equal the amount of elements on the other side (products).

Explanation:

CH₄ + 4Cl₂ -> CCl₄ + 4HCl

Reactants:

1 C

4 H

8 Cl

Products:

1 C

4 H

8 Cl

Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.

How can electronegativity be used to explain the reaction we see in terms of the numbers and types of bonded being formed in lithium?

Answers

Explanation:

Lithium is an electropositive element that readily loses electrons.

Oxygen is electronegative and it will readily accept electrons.

 Due to this significant electronegativity differences between the two species they form electrovalent or ionic bonds between them.

  2atoms of Li lose two electrons:

      Li  →  Li²⁺ + e⁻

             Lithium isoelectronic with helium

 For oxygen;

      O + 2e⁻   →  O²⁻

                          Oxygen is isoelectronic with Neon

Two ions of the lithium combines with the oxygen to form the bond;

                   4Li + O₂  →  2Li₂O

The electrostatic attraction between the two ions forms the ionic bond

Which of the following is the best insulator?

Group of answer choices

copper

aluminum

gold

wood

Answers

Answer:

wood

Explanation:

hope this helps! good luck on ur test :)

Answer:

Wood

Explanation:

Emma draws a sketch of what happens to light as it moves through air and then into a tank of water. describe what happens to the speed of light as it enter the water.
Answer if you know, if you don't move on please! If you don't know comment not answer. Thank you!!

Answers

Answer:

The speed of light becomes slower in denser medium which is water in this case.

Explanation:

We know the lens law of Refraction which states

[tex]\frac{Sin(i)}{Sin(r)} =[/tex]  Refractive index of second medium /Refractive index of the first     medium

= Velocity of light in medium 1 (V1)/ velocity of light in medium 2 (V2)

When light rays fall from air medium into water which is a denser medium bending of light or change in the direction of light occurs which is knows as Refraction.

When refraction occurs speed of the light rays are also varied as we can see it from the Lenz's Law. suppose two light rays parallel to each other falling on the air-water interface at an angle , the first ray will reach the interface and bend about the normal and then the second ray. We also observe when light enters denser medium the speed of light becomes slower, also the bending of light when going from rarer to denser it bends towards normal of the surface and when it move from denser to rarer medium it moves away from the normal to the surface.

221 A grocery shop has different types of fruit: one box contains 10 mangos, another
contains 7 avocados and the third box contains 5 lemons.
The same shop has 20% organic food. 50% inorganic food, and 30% of the things they sell
are juices.
3 marks)
A) Represent the types of fruit in bar graph.
B) Represent the sales in pie graph.

Answers

Answer:

A) Please see the required bar graph attached

B) Please see the required pie graph attached

Explanation:

The given data are;

The number of each fruit in each box are;

First box contains 10 mangoes

Second box contains 7 avocados

Third box contains 5 lemons

The percentage of the things they sell are;

Organic food = 20%

Inorganic food = 50%

Juices = 30%

A) The bar graph is plotted with Microsoft Excel

The height of each column is equivalent to the number of fruit in the box

Each column represents a box of fruit

B) The pie graph (chart) is generated with Microsoft Excel

The steps to draw the pie chare are;

1) Draw a circle

2) Partition the circle into segments proportional to each percentage from the center of the circle as follows;

The sum of angles at the center of the circle = 360°

The angle of the segment that will represent the 20% organic food in the pie chart = 20/100 × 360° = 72°

Therefore, the segment representing organic food will have an angle of 72° at the center of the circle

Similarly, the segment representing inorganic food will have an angle of  50/100 × 360° = 180° at the center of the circle

The segment representing juices will have an angle of  30/100 × 360° = 108° at the center of the circle.

An ionic compound is

A.a salt

B.held together by a transfer of electrons

C.composed of anions and cations

D.held together by sharing of valence electrons

Answers

The answer is C , composed of anions and cations .

Refer to the above image. Which of these is NOT found in the nucleus of an atom?
A
Neutrons
B
Protons
С
Atomic mass
D
Electrons

Answers

I think the Atomic Mass is the answer

Answer:

Atomic mass

Explanation:

I got it right on my test

Perform the following
mathematical operation, and
report the answer to the correct
number of significant figures.
7.68 x 4.564 = [?]

Answers

Answer:

35.05152

Explanation:

Answer:

35.1

Explanation:

I put that answer in and it was correct.

Which of the following statements are incorrect?
A. A sodium atom has a smaller radius than a potassium atom.
B. A neon atom has a smaller radius than an oxygen atom.
C. A fluorine atom has a smaller first ionization energy than an oxygen atom.
D. All are statements are incorrect

Answers

b is the answer because oxyen atom has a smaller radius

Answer: B

Explanation:

What is the formula for mass number?

Answers

Answer:

the formula for mass number is "mass number = protons + neutrons".

The volume of a fixed sample of a gas is 150 mL at 25°C , at what temperature will its volume increase to 350 mL ?

Answers

Answer:

it is 52.7

Explanation:

so when it is 30 the degree is 5°

when it is 60, the degree is 10°

when it is 90, the degree is 15° and so on...

Answer:

T₂ = 695.33 K

Explanation:

Given data:

Initial volume = 150 mL

Initial temperature = 25°C (25+273 = 298 K)

Final temperature = ?

Final volume = 350 mL

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

T₂ = V₂T₁ /V₁

T₂ = 350 mL × 298 K / 150 mL

T₂ = 104300 mL.K / 150 mL

T₂ = 695.33 K

Isopentyl acetate is the molecule largely responsible for the aroma and taste of bananas. It is made up of carbon, hydrogen, and oxygen. Combustion of a 3.256-g sample of isopentyl acetate produces 7.706 g CO2 and 3.156 g H2O. Using these results, what is the correct empirical formula for isopentyl acetate?

Answers

Answer:

Explanation:

7.706 g of CO₂ will contain 12 x 7.706 / 44 g of C

= 2.1 g of C .

This will be contained in 3.256 g of isopentyl acetate

3.156 g of H₂O will contain 2 x 3.156 / 18 g of H

= .351 g of H

This will be contained in 3.256 g of isopentyl acetate

Rest will be oxygen

amount of oxygen in 3.256 g of isopentyl acetate

= 3.256 - ( 2.1 + .351 )

= .805 g

ratio of C , H , O in isopentyl acetate

= 2.1 g : .351 g : .805 g

2.1 / 12 : .351 / 1 : 0.805 / 16 ratio of moles

= .175 : .351 : .05  ratio of moles

= 3.5 : 7.02: 1

= 7 : 14 : 2

empirical formula of  isopentyl acetate

= C₇ H₁₄ O₂ .

Why are supergiant so bright?

Answers

Because supergiants are so massive, the core temperature gets much hotter than in giants, so supergiants can fuse elements heavier than hydrogen and helium. But to support their tremendous mass, supergiants burn up their fuel much more quickly.

Answer:

because the core tempature gets much hotter.

Explanation:

so supergiants can fuse elements heavier than hydrogen and helium. But to support their tremendous mass, supergiants burn up their fuel much more quickly.

7th grade help me plzzzzzzzz

Answers

Answer:

1. Metals

2. Solid, gas, liquid

Explanation:

For #1:

The majority of elements in the periodic table are classified as metals. The transition metals lie in the center of the table, spanning groups three through 12. These elements are solid at room temperature, except mercury, and have the metallic color and malleability expected of metals.

Hope this helps :)

Lithium has two isotopes, lithium-6 weighing 6.015 amu (7.5% abundance), and lithium-7
weighing 7.016 amu (92.5% abundance). What is the atomic mass of lithium?
with calculations

Answers

Answer:

The answer is 6.941 but I dont really have the explanation

Explanation:

The atomic mass of lithium will be 6.9458 amu.

What is Atomic Mass ?

The mass of an atom of a chemical element expressed in atomic mass units.

It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

Calculation :

Consider 10000 atoms of Li ;

742 of them would have mass 6.02.9258 of them would have mass 7.02

.

Hence,

The total mass of these 10000 Li atoms would be ;

(742 × 6.02) + (9258 × 7.02) = 69458

∴ 1 Li atom on average would have mass =  69458 / 10000 = 6.9458 amu

Therefore, The atomic mass of lithium will be 6.9458 amu.

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The first noble gas with a Lewis Structure with 8 dots is

A. Ar
B. Kr
C. He
D. ne

Answers

Answer:

C) He

Explanation:

Helium is one of the noble gases and contains a full valence shell. Unlike the other noble gases in Group 8, Helium only contains two valence electrons.

Which is the best description of a molecule?

Answers

Answer:

A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.

Answer:

C

Explanation:

How many number of oxygen molecules are required to produce 0.22 g of CO2 according to the reaction?
c+o2=co2​

Answers

The number of moles for co2=mass(g)/molar mass
n=.22/44=.005 mole of CO2
from the equation we see the relationship between the moles of co2 and O2 and we find that they have the same number of moles
So we need .005mole of O2
Multiple the number of moles with avogadro’s number to know the number of O2molecules
.005x6.022 x10^23

The compound whose molecules have the highest average kinetic energy is?

Answers

Answer:

C)

Explanation:

The warmer the molecules, the higher the average kinetic energy.

"As stated in the kinetic-molecular theory, the temperature of a substance is related to the average kinetic energy of the particles of that substance. When a substance is heated, some of the absorbed energy is stored within the particles, while some of the energy increases the motion of the particles. This is registered as an increase in the temperature of the substance." -lumen learning

(I know for sure but what think... hope this helped)  

The tendency of an atom to attract electrons to itself is ionization energy. effective nuclear charge. electron affinity. electronegativity.

Answers

Answer:

electronegativity

Explanation:

Answer:

THe tendoncy is electronegstivity

Explanation:

Im a big brain person

Other Questions
Can someone please download this file and complete it for me... PLEASE!and before you say use translate I cant. Select the correct answer In terms of its register, which of these sentences is the odd one out?A, You must tell the DVLA if you've got any problem with your eyesight that affects either eye.B, Even if your appearance has not changed, you must get a new photo when you get a new passport.C, With its porous mass interior, an acetylene welding cylinder is dissimilar to other gas cylinders.D, You must do jury service when you're sent a jury form, unless you're allowed to delay it. How much eat is absorbed when 50.0g of water changes from 25.0 Celsius to 37.0 Celsius? Neurons or nerve cells communicate by passing electrical charges from one to the next. A message is sent along this network of neurons like an old-school game of telephone with cans and strings. Thinking about how the game of telephone works when passing messages, explain what can happen if one or more cells along this network becomes faulty. enzymes are an example of which main class of organic compounds.(carbohydrates, lipids, proteins, or nucleic acids Which of the following statements are incorrect? A. A sodium atom has a smaller radius than a potassium atom.B. A neon atom has a smaller radius than an oxygen atom.C. A fluorine atom has a smaller first ionization energy than an oxygen atom.D. All are statements are incorrect Refer to the above image. Which of these is NOT found in the nucleus of an atom?ANeutronsBProtonsAtomic massDElectrons HELP PLZ what is 3 ways the nation establish its identity PLEASE HELP THIS IS TIMED!The table shows the dates,times, and high and low tide heights.On what date and time was the lowest tide?A) Thursday, Feb 7, at 2:29 p.mB) Friday, Feb 7, at 9:21 p.mC) Friday, Feb 8, at 2:24 a.mD) Friday, Feb 8 at 3:16 p.m Please help ASAP Will mark as the crown thingy dddddddddfggkkkkkkkkkkkjjjjhhhhhhhhbb Cami goes scuba diving. She descends 18 feet in 3 minutes. Which expressions represent the average rate at which Camis position changes in feet per minute? Read the sentence.Leila stared at the driver of the shiny red convertible stopped in the middle of the intersection, incredulous that he would stop traffic just to yell at another driver behind him.What does the use of incredulous connote?that Leila is envious of the driver for having a convertiblethat Leila is angry at the driver for stopping in the intersectionthat Leila thinks she might know the driver of the convertiblethat Leila is shocked at what the driver of the convertible did Pls help Write out the C Major Scale one octave ascending and the C Major arpeggio one octave ascending. Why are the French forced to surrender to the British in September 1801? They retreat to Alexandria. Cairo falls to the Turks in June. They are outnumbered. Their scholars want to stay. Which expression is equivalent to y^3-2y^2+y what happened at the Battle of Lexington? Please select the word from the list that best fits the definitionHis discovery led to the invention of electric generators. (the answer choices is below) How do slab pull forces affect plate motion? Choose the correct answer.Uplifted mantle causes plates to move apart.Convection currents drive the plate downward to move it.Earthquakes break the crust into smaller plates to make motion easier.The weight of the subducted plate produces a force to continue moving the plate. Is a mirror reflective?