Solutions
Which statement is true of pure substance

1. They may contain one type of atom or one type of molecules.
2.they can only contain one type of molecules.
3.they can contain different types of atoms and molecules.
4.they can only contain one type of atom

This is science btw

Answers

Answer 1

Answer:

4

Explanation:

cuz pure substance contain one type of atom,molecule,or cpd.

2 is true but it have wrong grammar,if it contain only one type it must be^^molecule^^


Related Questions

the factor that governs the formula of an ionic compound such as ca3n2 is

Answers

Answer:

the charge or oxidation number on the cation and anion.

Explanation:

The factor that governs the formula of an ionic compound such as Ca3N2 is the charge or oxidation number on the cation and anion.

In the example, Ca has a +2 charge, N has a -3 charge

So we need 3 x ( +2) to balance 2 x (-3) and have an electrically neutral compound, so

+6 -6 =0

The factor that governs the formula of an ionic compound such as Ca₃N₂ is charge.

What are ionic compounds?

Those compounds in which ionic bond is present between the cation and anion is known as ionic compound.

The most important factor that is essential for the formation of ionic compounds are charge i.e. positive charge and negative charge. In the given compound Ca₃N₂, Calcium (Ca) is present in the +2 oxidation state and Nitrogen is present in the -3 oxidation state. So due to attraction between these charges they make a ionic compound.

Hence charge is important factor.

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what is air pressure? In your own words

Answers

Answer:

The amount of force applied on an object that is moving in motion

Explanation:

MULTIPLE CHOICE QUESTION
Which of the above represents a cell in an
isotonic solution?
B
А
C

Answers

Answer:

B

Explanation:

the Periodic Table •
Class
Key Terms
Key Terms Ch. 4
Use the clues to help you unscramble the Key Terms from the chapter. Then put the
numbered letters in order to find the answer to the riddle.
Clues
Key Terms
1. A fast-moving electron
given off by a nucleus
during radioactive decay. tbaerlpiaect
2. A term used to describe a
material that can be pounded
into shape
llbeealam
3. The process of oxygen
reacting with a metal to
form rust
4. A particle in the atomic
nucleus that carries no
charge
5. A horizontal row across the
2
rsoooiner
3
ouetnrn
periodic table
roiedp
6. Substance that can only
6
conduct electric current
under certain circumstances. otmidsceuncro
7
7. A term used to describe a
material that can be drawn
into a long wire
lecuitd
8 9
8. Radioactive isotope that can be
followed through a chemical
reaction or an industrial
process
aerrtc
9. The elements in Group 18
of the periodic table
nreti ssgea
11 12
10. The very small center core
of an atom
13
10
cuunsle
Riddle: What chart shows the repeating properties of elements?
Answer:
1 2 3 4 5 6 7 8 9 10 11 12 13

Answers

Answer:

your question too long did not read all

Explanation:

What mass of water absorbs 6700 J of heat to raise the temperature from 283K to 318K?​

Answers

Answer:

you did not give the specific heat like formula like it takes 1kj to raise 28grams of water by 10 grams

Elements with ________________ first ionization energies and ___________ electron affinities generally form cations.

Answers

Answer:

elements with low first ionization energies and positive or slightly negative electron affinities generally form cations.

hope it is helpful:)

If i initially have a gas with a pressure of 84 kpa and a temperature of 350 c and i heat it an additional 230 degrees, what will the new pressure be? assume the volume of the container is constant.

Answers

Answer:

67.824

Explanation:  You want to use the combined gas law equation (P1*V1)/(n1*T1)=(P2*V2)/(n2*T2). So first cross out what remains constant, so volume(V) and I assume moles (since it was not mentioned as a change). Then you can solve algebraically for the answer!

Hope this helped!

The new pressure will be 139.2 kpa .

What is the combined Gas Law?

According to combined gas law,

[tex]\rm\dfrac{PV}{nT} = R[/tex]

In the Combined Gas Law,if we change either one of the variables the others will also change.

When the moles of the gas is constant , the above equation can be written as ,

[tex]\rm \dfrac{P'V'}{T'}= \dfrac{PV}{T}[/tex]

Given is P = 84kpa , T= 350⁰ C and T' = 350+230=580⁰ C , V=V' , P'=?

So we will substitute the values in the above formula keeping volume constant.

[tex]\rm \dfrac{P'}{T'}= \dfrac{P}{T}[/tex]

[tex]\rm\dfrac{P'}{580}= \dfrac{84}{350}[/tex]

[tex]\rm P' = \dfrac{84\times 580}{350}[/tex]

[tex]\rm P'= 139.2 \;kpa[/tex]

Therefore the new pressure will be 139.2 kpa .

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 #SPJ2

What is the molar mass of an unknown gas with a density of 3.35 g/L at 1.00 atm and 25.0 °C

Answers

Answer:

[tex]\implies \sf D = \dfrac{PM}{RT}[/tex]

[tex]\implies \sf 3.35= \dfrac{1 \times M}{ \frac{1}{12} \times 298}[/tex]

[tex]\implies \sf 3.35= \dfrac{12\times M}{ 298}[/tex]

[tex]\implies \sf 3.35 \times 298= 12\times M[/tex]

[tex]\implies \sf 998.3= 12\times M[/tex]

[tex]\implies \sf M = \dfrac{998.3}{12} [/tex]

[tex]\implies \bf M = 83.1917 \: \frac{g}{mol} [/tex]

a. What are the half-reactions for the redox reaction CuCl2 + Zn → ZnCl2 + Cu? Label the oxidation
reaction and the reduction reaction. (1 point)
PLS HELP 100 points

Answers

The oxidation half equation is Zn ------> Zn^2+ + 2e while the reduction half equation is Cu^2+  + 2e------> Cu.

A redox reaction is a reaction in which there is a loss/gain of electrons. The specie that gives out electrons experiences an increase in oxidation number while the specie that gains the electrons experiences a decrease in oxidation number.

For the reaction; CuCl2 + Zn → ZnCl2 + Cu

The oxidation half equation is;

Zn ------> Zn^2+ + 2e

The reduction half equation is;

Cu^2+  + 2e------> Cu

The chloride ion is excluded because its oxidation number does not change from left to right in the reaction.

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How does a phase change from solid to liquid occur in a substance?(1 point)

Answers

Answer:

As heat is added to solid water, the temperature increases until it reaches 0 °C, the melting point. At this point, the phase change, added heat goes into changing the state from a solid to liquid. Only when this phase change is complete, the temperature can increase.

hope this helps

Heat is responsible for the change of phase from solid to liquid state.

A phase change from solid to liquid occur in a substance by heating of that substance because the bonds present between solid particles can be broken down with the help of heat energy.

When the bond is heat at the temperature on which it is broken down, the solid particles are converted into liquid substance so we can conclude that heat is responsible for the change of phase from solid to liquid state.

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Question ( please help me )

1 . Which diagram shows pure substance that are elements

2. Which diagram shows pure substance are compounds

3. Which diagram shows a mixture of compounds

4. Which diagram shows a mixture of elements

5. Which diagram shows a mixture of an element and a compound

Answers

Answer:

1. F, H, E

2. A, D, I

3. G

4. E, B, H

5. C

Explanation:

14. Write a statement that makes a claim about arrangements of electrons and properties
within a family of elements.

Answers

i dont know

Explanation:

275 KJ of energy was transferred to water at 15c. Calculate the mass of water that can be brought to its boiling point

Answers

Answer:

need points rn sorry bro hope u get ur answer

Explanation:

asap help for brainlist
Which pair of atoms will form a covalent bond?

Question 7 options:

H and O


Li and I


K and Fl


Na and Cl

Answers

Answer:

h and o

Explanation:

because both are non metals

which of the following molecules can form hydrogen bonds with others like it?

Answers

Answer:

nitrogen, oxygen and fluorine

22) Calculate the energy of a photon of radiation with a frequency of 9.50 x 1013 Hz.

Answers

The energy of the photon with a frequency of 9.50×10¹³ Hz is 6.29×10¯²⁰ J

From the question given above, the following data were obtained:

Frequency (f) = 9.50×10¹³ Hz

Planck's constant (h) = 6.626×10¯³⁴ Js

Energy (E) =?

The energy of the photon can be obtained as follow:

E = hf

E = 6.626×10¯³⁴ × 9.50×10¹³

E = 6.29×10¯²⁰ J

Therefore, the energy of the photon is 6.29×10¯²⁰ J

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What are atoms made of.

Answers

Answer: Atoms are made of dust because God made us with dust.

Explanation:

Atoms are constructed of two types of elementary particles: electrons and quarks

How to find formula for ionic compounds.

Answers

Answer:

I am using an example for this in this table it works for any other compound as well.

Why can’t you split an element in half?

Answers

Answer:

It depends on the atom, or more specifically, on the size of its nucleus. There is a competition between the electrical repulsion of the protons (that drives the nucleus apart) and the attraction of the protons and neutrons (due to chromodynamics). For nuclei above a certain size, the repulsion tends to win

Explanation:

hope this helps

How many cl- ions are there in 2. 50 kg of barium chooride.

Answers

4.90cl i’m a barium choordidr 30

Which type of dry-chemical fixed application method introduces a concentration of agent into a closed area

Answers

Actuating mechanism is the dry-chemical fixed application method which

introduces a concentration of agent into a closed area.

The actuating mechanism is commonly used in piping systems and

involves the transport of a control member in automatic or remote control

systems.

The closed system makes manual navigation very difficult which is why the

actuating mechanism in automatic systems are usually used to make it less

tedious and accurate.

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why does helium fusion require higher temperatures

Answers

Answer:

Nuclear fusion of hydrogen to form helium occurs naturally in the sun and other stars. It takes place only at extremely high temperatures. That's because a great deal of energy is needed to overcome the force of repulsion between the positively charged nuclei.

Explanation:

hope it helps

How does acid base extraction work.

Answers

Answer:

it can be done using the method of lithium paper

Technique. Usually, the mixture is dissolved in a suitable solvent such as dichloromethane or diethyl ether (ether), and poured into a separating funnel. An aqueous solution of the acid or base is added, and the pH of the aqueous phase is adjusted to bring the compound of interest into its required form.







Q. What phase change occurs at letter A?

Answers

Answer:

Where is the picture? Can't answer without it.

What is the unabbreviated electron configuration for Barium?

Answers

Answer:

[Xe] 6s2

Explanation:

hope it helps Electron configuration

Solid calcium hydroxide is dissolved in water until the pH of the solution is 11.44. The hydroxide ion concentration [OH–] of the solution is:______.A. 1.1 * 10-11 M.B. 3.06 M.C. 8.7 * 10-4 M.D. 1.0 * 10-14 M.E. None of these.

Answers

Answer:

c the answer is c that is the answer

An unknown element sample has 2 isotopes present. The first isotope has a mass of 6.017 amu and is
7.30% abundant. The second has a mass of 7.018 amu and an abundance of 92.7%. Calculate the
average atomic mass of this element

Answers

Answer:

Calculating Atomic Mass

Change each percent abundance into decimal form by dividing by 100. Multiply this value by the atomic mass of that isotope. Add together for each isotope to get the average atomic mass.

Explanation:

have a nice day

Convert 1.56x10^30 particles of sodium chloride to grams of sodium chloride

Answers

Answer:

I cannot tell yet

Explanation:

I don't take that class yet but ill get back to you

Why are you more likely to become dehydrated in hot weather?

Answers

Answer:

sweat

Explanation:

you get dehydrated in hot weather because your body will release sweat to try and keep you cool

Answer:

Well, the heat can sometimes be very subtle in how it affects the body. If you're out in the sun, it can take just 30 minutes or up to a few hours for the heat to cause dehydration, nausea or it could cause trouble concentrating. When it's hot and humid, your risk of dehydration and heat illness increases. That's because when the air is humid, sweat can't evaporate and cool you as quickly as it normally does, and this can lead to an increased body temperature and the need for more fluids.

I HOPE DAT THIS HELPS :)

Explanation:

If you have a 100g of Boron and you want to find out how

many molecules of Boron you have, you would need to...

Answers

Answer:

5.57 x 10^24 atoms

Explanation:

first, you are seeking the number of ATOMS of Boron.

Boron has an Atomic mass of 10.8 g/mol (see #5 on the periodic table)

100 gm of Boron would have 100 g /10.8 g/mol =9.26 moles

each mole has Avogadros number of atoms 6.02 x 10^23

9.26 moles has 9.26 x 6.02 x 10^23 atoms =5.57 x 10^24 atoms

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