Which describes a chemical change? (Select all that apply.)

A new substance is created.
A phase change is occurring.
It is a permanent change.
It can be a physical change.

Answers

Answer 1

Explanation:

it is a permanent change

Answer 2

Answer: It is a permenat change

Explanation: Because you are creating it into something else and when it turns into that thing it stays like that permanatly.


Related Questions

state what method you would use the separate water from a potassium iodide solution​

Answers

Answer:

You can separate the Iodine from the water and convert the potassium iodide into elemental Iodine by mixing 1 part of a 5–13% solution of Iodine/Potassium Iodide with 1 part distilled water and 1 part 3% Hydrogen Peroxide Solution followed by 1/12 part 32.45% hydrochloric (Muriatic) acid.

lights of different frequencies make up

Answers

Answer:

Light waves come in a continuous variety of sizes, frequencies and energies, a continuum known as the electromagnetic spectrum. Once Maxwell introduced the concept of electromagnetic waves, everything clicked into place.

Explanation:

Hope this helps:)

~Kisame'sAbs

______help in increasing rates of reactions

Answers

Answer:

Catalysts help in increasing rates of reactions

Answer:

тємρєяαтυяє

Explanation:

Temperature. Usually reactions speed up with increasing temperature.

Observe: Turn on Show molecular view, and notice the water molecules. Set the Water volume to 100 mL and the Powder mass to 20 g, and then click Play. Click Pause () after adding the powder. You should now see show some sodium acetate in the water.

What color represents the bonds between the particles of NaC2H3O2?





Click Play. Watch the animation a few times. What happens to the NaC2H3O2 bonds?





What happens to the bonds between water molecules?

Answers

Answer: how old are you

Explanation:

what happens to the matter in water as it evaporates ​

Answers

Answer:

It changes from a liquid to a gas. I hope this helps you! :D

what type of energy is the sum of kinetic and potetinal energy in an object that is used to do work

Answers

Answer:

mechanical energy

Explanation:

what is the total amount of energy absorbed by the substance as it completely changes from a solid at 40 degrees to a gas at 200 degrees

Answers

Answer:

I don't know the answer sorry man

Predict the reaction
HCIO4+ KOH=

Answers

Answer:

HClO4 + KOH → KClO4 + H2O

Explanation:

Answer:

HCIO4 + KOH → KCIO4 + H2O

Explanation:

nailed it

What are acids ? Will they harm skin

Answers

Hydrochloric acid can cause damage if it comes into contact with your lungs, eyes, stomach, or skin. If hydrochloric acid comes into contact with your skin, it can cause: chemical burns. scarring.

Tính axit giảm dần của các chất C6H5 OH (1) ,p – CH3 OC6H4 OH (2), p-NO2C6H4OH (3) pCH3COC6H4OH (4), p-CH3C6H4 OH (5) là:

Answers

Answer:

di ko po Alam sorry

Explanation:

sorry sorry sorry sorry sorry


The vapor pressure of a liquid at a given temperature is measured when the rate of evaporation of a liquid becomes

Answers

Answer:

the liquid becomes equal to the rate of condensation

Explanation:

ive come across this question before! and i think its right! :D

The vapor pressure of a liquid at a provided temperature is measured when the rate of evaporation of a liquid evolves equally to the rate of condensation.

What is Evaporation?

Evaporation is the procedure by which water transforms from a liquid to a gas or vapor.

Evaporation is the primary route that water moves from the liquid circumstances around into the water cycle as atmospheric water vapor.

When a molecule around the surface absorbs adequate energy to overwhelm the vapor pressure, it will exit and join the surrounding air as a gas.

Find more information Evaporation here:

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96 POINTS

1. An atom of platinum has a mass number of 195 and an atomic number of 78. How many protons and neutrons are in this atom? – Calculate your answer and please note that work must be shown to earn credit.

Answers

neutrons=117

protons=78

Answer:

Platinum has mass number 195.

The atomic number of platinum =78

so the number of protons is 78.

By using simple formulas

we can find out that how many neutrons and protons are present in an atom of platinum-195.

Mass number = neutrons + protons

195=neutrons + 78

neutrons=195-78=117

so the number of neutrons is 117.

Use the pie section above to answer this question.

The pie section shows Earth's composition from the center to the surface. Section IV is most likely composed of

solid iron.

basalt rock.

liquid iron.

granite rock.

Answers

Answer:

can you show me a picture of the pie chart?

Explanation:

if i dont see the pie chart then this question isn't possible to answer

6. What is the atomic mass of Hafnium if out of every 200 atoms, 10 have mass 176.00 g/mol, 38 have mass
177.00 g/mol, 54 have mass 178.00 g/mol, 28 have mass 179.00 g/mol, and 70 have mass 180.00 g/mol?

Answers

Answer:

fg

Explanation:

How do we find the atomic size of an atom?

Answers

Answer:

The size of an atom can be estimated by measuring the distance between adjacent atoms in a covalent compound. The covalent radius of a chlorine atom, for example, is half the distance between the nuclei of the atoms in a Cl2 molecule.

Plss answer!!! I need help fast

Answers

Answer:

2 Na atoms

1 C atom

3 O atoms

gram formula weight = 105.99 g

hope this helped :)

Explanation:

→ Na

# of Atoms - 2

→ C

# of Atoms - 1

→ O

# of Atoms - 3

→ gram formula weight (g) : 105.99 g

How many moles of Magnesium(Mg) are
in 2.46 x 10^28 atoms of Magnesium?

Answers

so 2.46 X 10^28 contains (2.46 X 10^28)/(6.02 X 10^23) =

(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=

4.09 X 10^4 = 40,900

Answer:

4.09 X 10^4 = 40,900 moles

Explanation:

How many moles of Magnesium(Mg) are

in 2.46 x 10^28 atoms of Magnesium?

PLEASE LEARN THIS FUNDAMENTAL RULE OF CHEMISTRY...1 MOLE OF ANYTHING CONTAINS AVOGADROS NUMBER OF PARTICLES}

6.02 X 10^23.09

so 2.46 X 10^28 contains in moles(2.46 X 10^28)/(6.02 X 10^23) =

(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=

4.09 X 10^4 = 40,900 moles


Which temperatures originally represented the fixed points
Celsius temperature scale?

Answers

Answer:Since 1743 the Celsius scale has been based on 0 °C for the freezing point of water and 100 °C for the boiling point of water at 1 atm pressure. Prior to 1743 the values were reversed (i.e. the boiling point was 0 degrees and the freezing point was 100 degrees).

Explanation: i no it

What happens when the compound CaCl2 forms?

Answers

Explanation:

Calcium gives valence electrons to both chlorine atoms so that they have a full outer shell.

A compound's properties are different than the properties of the elements that make it up.

A)True
B)False

Answers

The answer is True because elements in a compound combine and become an entirely different substance with its own unique properties.

A boy rides his bike to his friends house. He travels 2 miles in 8 minutes. What is the boy's average speed? Write the formula, plug in the numbers, and write the answer.

Answers

Explanation:

y = 4×

explnation

8÷2 =4

1 mile equals 4 minutes

A boy rides his bike to his friend's house. He travels 2 miles in 8 minutes, the boy's average speed will be 0.25 meters per second (m/s).

What is speed?

Speed of any object is the rate of change of position in the given time of interval or given time of the unit is said to be speed an can be measured by dividing the distance traveled with the time.

A boy rides his bike to his friend's house. He travels 2 miles in 8 minutes so the speed will be,

            Speed = distance / time

             Speed = 2 miles / 8 minutes

              Sped = 0.25 meter per second (m/s)

Therefore, the average speed will be 0.25 meters per second (m/s) if the boy rides his bike to his friend's house. He travels 2 miles in 8 minutes.

Learn more about speed, here:

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#SPJ2

1. Boiling
2. Opposite
3. Freezing
4. The particles lose energy to the surroundings
5. Condensation
6. B
7. E
8. D
9. A
10. C
That is my question don't liy

Answers

It is b because it is don’t argue it just do it

define the term chemotherapy.​

Answers

I'm not able to understand that what is written in the pic.. As I can't understand this language..

Treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Chemotherapy may be given by mouth, injection, or infusion, or on the skin, depending on the type and stage of the cancer being treated.

Butanoic acid + 2 propanol

Answers

Answer:

propyl butanoate

Explanation:

In the preparation of a certain alkyl halide, 10 g of sodium bromide (NaBr), 10 mL distilled water (H20), and 9 mL 3-methyl-1-butanol (C5H120) were mixed in the round-bottomed flask and allowed to cool for 2 -3 minutes. Then while swirling the flask, 10 mL sulfuric acid (H2SO4) was slowly added to the flask and the mixture was refluxed and later distilled. The mass of the pure product obtained was 6.48 g. Sodium hydrogen carbonate (NaHCO3) was used to remove impurities. (Density of 3-methyl-1-butanol is 0.810 g/mL). The percentage yield will be?​

Answers

Percentage yield shows the amount of reactants converted into products. The percentage yield of the reaction is 51.7%.

The equation of the reaction is sown in the image attached. The reaction is 1:1 as we can see.

Number of moles of NaBr = 10 g/103 g/mol = 0.097 moles

We can obtain the mass of 3-methyl-1-butanol from its density.

Mass = density × volume

Density of 3-methyl-1-butanol =  0.810 g/mL

Volume of  3-methyl-1-butanol = 9 mL

Mass of 3-methyl-1-butanol = 0.810 g/mL × 9 mL

Mass of 3-methyl-1-butanol = 7.29 g

Number of moles of 3-methyl-1-butanol =  mass/molar mass =  7.29 g/88 g/mol = 0.083 moles

Since the reaction is 1:1 then the limiting reagent is 3-methyl-1-butanol

Mass of product 1-bromo-3-methylbutane = number of moles × molar mass

Molar mass of 1-bromo-3-methylbutane = 151 g/mol

Mass of product 1-bromo-3-methylbutane = 0.083 moles × 151 g/mol

= 12.53 g

Recall that % yield = actual yield/theoretical yield × 100

Actual yield of product = 6.48 g

Theoretical yield = 12.53 g

% yield = 6.48 g/12.53 g × 100

% yield = 51.7%

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Sodium, Na, is a metallic element.
Explain, with the aid of a labelled diagram, what is meant by the term metallic bonding.

Answers

Answer:

metallic bonding is the bond form between two or more metal elements or between metal element and the other group elements

WHAT IS THE COLOR OF METHYL ORANGE


1. YELLOW
2. PINK
3. ORANGE​

Answers

Answer:

3.Orange it literally say's it methyl ORANGE

Explanation:

Brainliest plz

Answer:

Other indicators

Indicator Acidic Alkaline

Methyl orange Red Yellow

Phenolphthalein Colourless Pink

what is the bonding of hydrogen?

Answers

Answer:

A hydrogen bond is a primarily electrostatic force of attraction between a hydrogen atom which is covalently bound to a more electronegative atom or group, and another electronegative atom bearing a lone pair of electrons..

(refer the image)

Explanation:

brainliest plz

which of the materials above are mixtures​

Answers

Answer:

water and vinegar

:salad

Explanation:

There is two kind of mixture the heterogeneous and homogeneous mixture.Which water and vinegar is the homogeneous and the salad is heterogeneous mixture based on my example above.

chemical formula of vinegar + cream of tartar

Answers

KC4H5O is the formula of vinegar + cream
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