Chemistry High School

which Two of the following are pure substances*

A. Compounds

B. Elements

C. Solutions

D. Mixtures

Answers

Answer 1

Answer:

I think A and B

Explanation:

Answer 2

Answer:

A. & B.

Explanation:

Neither can be broken down into something besides an atom, the "purest" form matter can exist in. For example, if you were to break down C6H12O6 (glucose), you wouldn't be able to break down a singular atom of carbon into something different.

Related Questions

HELP ASAP!!!
Which of the following is a function of the cell membrane?

Producing energy
Creating new cells
Eliminating of waste
Replacing damaged cells

Answers

Producing energy is the answer

Is the process represented below an example of a physical or a chemical
change?

CO2(s) —» CO2(g)

Answers

It is a physical change because only the states as being changes, not the actual bonds in the compound.

Atoms of a solid substance are motionless.

A) True
B) False

Answers

B.) false, no matter the state the atoms are still moving. they move really fast through gas and slow down in liquids and for solids only vibrate

If an object has a Mass of 11g and a volume fo 13mil, what is its density?
A.143g/ml
B.0.85g/ml
C.2g/ml D.24g/ml

Answers

Answer:

[tex]\boxed {\boxed {\sf B. \ d \approx 0.85 \ g/mL}}[/tex]

Explanation:

Density is found by dividing the mass by the volume.

[tex]d=\frac{m}{v}[/tex]

The mass of the object is 11 grams and the volume is 13 milliliters.

[tex]m= 11 \ g \\v= 13 \ mL[/tex]

Substitute the values into the formula.

[tex]d= \frac{11 \ g}{13 \ mL}[/tex]

Divide.

[tex]d=0.846153846 \ g/mL[/tex]

Round to the nearest hundredth. The 6 in the thousandth place tells us to round the 4 to a 5.

[tex]d \approx 0.85 \ g/mL[/tex]

The density is about 0.85 grams per milliliter.

X
What period are
the elements
that have an
outer layer O in?

Answers

Answer:

carbon

Explanation:

second (n = 2) shell, more specifically its 2s and 2p subshells.

Do you believe humans are responsible for global warming or do you believe this is part of a natural cycle of Earth, like periodic ice ages?

Answers

Answer:

If I had to choose I think it would be humans fault.

Explanation:

To think that we are the reason for global warming and everything would make the next person a little insulted but when you think about it a long time ago when there was not many technological advancements there was not complains of global warming or anything until recently. Temperatures are starting to rise and more and more pollution is filling our atmosphere. As it could be true that it might not be entirely our fault as humans I think we took a major part in it.

Hope this helps :)

Convert 220 grams of CO2 into Moles.

Answers

Answer:

. 44.0 g/mol.

Explanation:

This should be the answer 9,682.09

Identify the reaction type and the products. Al+F2 ->

Answers

Answer:

redox and AlF2

Explanation:

Explain how mass extinctions occur.

Answers

Answer:

Mass extinctions happen because of climate change, asteroid impacts, massive volcanic eruptions or a combination of these causes.

Explanation:

Balance the following equation..

Answers

Answer:

CH4+4Cl2=CCl4+4HCI

Explanation:

It's been a while since i've done one of these, but I believe this is right. Hope this helps!

Determine el número de moles presentes en una esfera de titaniode 0.5 cm de radio, sabiendo que la densidad del titanio es de 4507kg/m³. =433

Answers

Answer:

0.0493 moles de Titanio

Explanation:

Primero, debemos hallar el volumen de la esfera. Usando la densidad podemos hallar la masa de titanio y usando la masa atómica encontraremos las moles de titanio:

Volumen de la esfera:

Volumen esfera  = 4/3π * Radio³

Volumen = 0.5236cm³

En m³ (1m³ = 1x10⁶cm³):

0.5236cm³ * (1m³ / 1x10⁶cm³) = 5.36x10⁻⁷m³

Masa en gramos:

5.36x10⁻⁷m³ * (4507kg / m³) = 2.36x10⁻³kg * (1000g / 1kg) = 2.36g de Titanio

Moles -Masa molar Ti: 47.867g/mol-:

2.36g de Titanio * (1mol / 47.867g) =

0.0493 moles de Titanio

Jay painted the inner four walls of a box. Then he put an ice block into it such that it did not touch the walls, but he couldn't do the same when he put water in that box. Why?

Answers

Answer:

Liquid takes the shape of container, so it will always touch the walls of the box in which you put it.

Explanation:

We know that a solid has a definite shape and a definite volume hence it occupies only its own volume in the box, it does not touch the walls of the box.

However, a liquid does not have a definite shape and volume. It occupies the volume of the box. Therefore, the liquid water must definitely touch the walls of the box.

Help please I have 10 min.

Answers

Type in chemistry calculator and type it in get the answers now u good you will never fail for chemistry again

a = 10 m/s - 5 m/s
5S

Answers

Answer:

what is the formula?

Explanation:

PLS HELPPP ASAP

According to the Periodic Table of Elements, the neutral atom of what element has 4
protons, 5 neutrons, and 4 electrons?
O A. beryllium
O B. boron
OC. fluorine
D. aluminum

Answers

The answer is beryllium

8)
How many molecules are there in 230 grams of CoCl2?

Answers

Answer:

1.07x10^24

Explanation:

thats the answer

Therefore, the number of mole will be 1.065 × [tex]10^{24}[/tex].

What is mole?

A mole is the quantity of a substance containing 6.023 x [tex]10^{23}[/tex] particles of that substance. The mole is really the SI unit for a substance's quantity.

It is given that, mass of 230 gram of CoCl2.

Moles = mass / molar mass

Put the value of given data in mole formula.

Moles = 230 / 129.8

Moles = 1.77

It is known that, 1 mole = 6.02 × [tex]10^{23}[/tex] molecule.

Hence, 177 moles =  6.02 × [tex]10^{23}[/tex] × 1.77 = 10.65 ×  [tex]10^{23}[/tex] .

Therefore, the number of mole will be 1.065 × [tex]10^{24}[/tex].

To know more about mole.

https://brainly.com/question/19922822

#SPJ2

For the reaction
? P4+? S8 - ? P4S10
what is the maximum amount of P4S10 which
could be formed from 15.29 g of P4 and 17.66 g
of Sg?
Answer in units of g.

Please hurry it’s due today and include the steps if you can

Answers

same i need help it’s also do today

If a 2,000-kilogram car accelerates at a rate of 3 meters per second squared,
what is the force the engine applied to the car?
HELP

Answers

Answer:

Explanation:

assuming there is no friction

fnet=ma

2,000 kg*3m/s=6,000 N

select three of the following compounds that are ionic

Answers

Explanation:

Ionic compounds are compounds formed by the bonding of a metal with  a non metal.

A. NO2

This is not an ionic compound because N and O are non metals.

B. CaCl2

This is an ionic compound because Ca is a metal and Cl is a non metal.

C. KI

This is an ionic compound because K is a metal and I is a non metal.

D. CO2

This is not an ionic compound because C and O are non metals.

E. H2O

This is not an ionic compound because H and O are non metals.

F. NaCl

This is an ionic compound because Na is a metal and Cl is a non metal.

6.
A crystal of the purple compound potassium manganate (VII) is placed at the bottom
of a beaker of water and the beaker left until there
is no further change. What will be
observed?
A a uniformly purple solution.
B
a purple layer below a colourless layer.
С a colourless layer below a purple layer.
D a deep purple layer below a pale purple layer.
Sec 3/KPT and SMS/2021
Page 2 of 3

Answers

Answer:

I don't know

Explanation:

sorry i just need point to ask so i have comment

Which of the following is the most accurate description of chemical energy? A. The energy released by heat in a chemical reaction B. The energy in the motion of the substance C. The energy stored in the chemical bonds of a substance D. The energy that is absorbed in a chemical reaction

Answers

Answer:

The answer is A  The energy released by heat in a chemical reaction

Explanation:

Hey everyone! Trying to figure out the name for this question. If you could help me, that would be amazing!

Answers

Is Nonane the correct answer? I did it based off of the molecular formula but I’m not sure if that’s the answer youre looking for

what are atoms? please answer me fast i need help​

Answers

Explanation:

an atom is the smallest unit of ordinary matter that forms a chemical element every solid liquid gas and plasma is compost neutral or ionized atoms. atoms are extremely small typically around 100 picometers across.

Hope it will help you

moles in 72 grams of NaHCO3

Answers

Answer:

0.857075413470408 moles

Explanation:

hope this helps!

It would be helpful if you could explain the process or do a few to show me how to do it. You don't need to do it all just one would help.
Thank you

Answers

1) So, the first step in finding the formula of a certain compound is to look at the periodic table and see what group they are in. The group they are in corresponds to their charge :
Group 1 has charges of 1+
Group 2 has 2+
Group 3 has 3+
Group 4 has +/-4
Group 5 has -3
Group 6 has -2
Group 7 has -1
Group 8 doesn’t form ions because they don’t react.

Do you notice a pattern? Group 4 is like the middle and both sides.

For example, lets look at the first question:
Na (Sodium) is in group 1. This means that its ions have a 1+ charge. And Cl (Chlorine) in in group 7, meaning it has a 1- charge.

2) In the next step we try to cancel out the charges by finding the lowest common multiple. But, in this case, there is no need because 1+ and 1- cancel out to have an overall charge of 0 when they are in a compound.

3) Lastly, we put the two elements together. If we multiplied it to cancel the charges in the previous step, then we need to put the number we multiplied it by in front of it.

Lets do another example:

Magnesium is in group 2, therefore it forms a 2+ ion.
Oxygen is in group 6, therefore it forms a 2- ion.
Both charges cancel out and we are left with MgO.

The next example involved the 2nd step.

Lithium is in group 1, so it forms 1+ ions.
Oxygen is in group 6, so it forms 2- ions.

In order to cancel out the charges, we have to multiply lithium by to to get Li2 with a 2+ charge.

Now the charges cancel and we can put them together to get Li2O.

Hope this helped! If you have any more questions please ask :))

Where is the energy found in sugar molecules?

Answers

Answer:

it is stored in the covalent bonds between the atoms

Explanation:

Have you figured out the answer yet ?

Answers

Answer:

no

Explanation:

Answer:

Not yet!

Note:

Please mark as Brainliest! <3

What Classification type star this?

Answers

Explanation:

The Sun is a as a G2V type star, a yellow dwarf and a main sequence star. Stars are classified by their spectra (the elements that they absorb) and their temperature.

whish this helped!

6 grams of sodium chloride (NaCl) is dissolved to create 0.5 L of solution. What is the
molarity of this solution?

Answers

Answer:

0.206M

Explanation:

Molarity, which refers to the molar concentration of a substance can be calculated using the formula as follows:

Molarity (M) = number of moles (n) ÷ volume (V)

According to the provided information, mass = 6grams, volume = 0.5L

Since molar mass of NaCl = 23 + 35.5

= 58.5g/lol

Mole = mass/molar mass

Mole = 6/58.5

Mole = 0.103mol

Hence;

Molarity = 0.103/0.5

Molarity = 0.206M

Which of the activities below does NOT affect the water cycle

Hydroelectricity


Deforestation

Exercising

Greenhouse effect

Answers

Answer:

Exercising would not affect the water cycle.

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