Chemistry High School

Help me please I really need this tomorrow

Answers

Answer 1

9.D

10.A

11.C

12.B

13.D

14.C

15.A

16.A

18.C

Related Questions

help me plz!!!!
a. Calculate the solution concentration for each of the HCl samples. The first one has been done for you.

b. As the concentration of the HCl solution increased, did the speed of the reaction increase or decrease?

c. Therefore, as the concentration of a reactant increases, does the rate of the reaction increase or decrease?

d. Do your predictions previous to this investigation agree with your results?

e. Make a general rule about the effects of concentration of reactants on reaction rates.

Answers

Answer:

From this solution, you can do the a number question answer.

What are the differences between molecule of an elements and molecules of a compound?

Answers

a compound is a pure substance made up of two or more elements chemically combined a molecule is defined as the smallest particle of an element which can exist separately elements are pure substances which can not be split into simple substances by chemical means the atom is defined as the smallest particle of an element which can take part in a chemical change so I think the difference between the molecule of a compound is bigger than the molecule of a compound

Oxygen is a diatomic element.why give reason.

Answers

Answer:

Diatomic molecules contain two atoms that are chemically bonded. If the two atoms are identical, as in, for example, the oxygen molecule (O2), they compose a homonuclear diatomic molecule, while if the atoms are different, as in the carbon monoxide molecule (CO), they make up…

Explanation:

yei hoo arko aaxaina ...

I am so lost Helppp! step by step would be great and any links would help!

Answers

Answer: i dont know

Explanation:

State one human activity that increase the amount of carbon dioxide in the atmosphere today.

Answers

Answer:

Burning of fossil fuels

Explanation:

Human activities that increase the amount of carbon dioxide in the atmosphere are;

1) Burning of fossil fuels in industrial and internal combustion engines

2) Depletion of the available forest cover, due to the consumption of wood as a raw material

3) Farming expansion that lead to clearing of forests for farming

4) Industrial activities such as the production of cement

5) Deforestation to provide land for development including buildings and infrastructure.

Help me and I'll make u Brainly eat and follow u

Answers

19. moth balls in the closet and observe after several days.

20. whenever wax or a candle burns it turns from solid to liquid but again at room temperature it turns to solid

21. evaporation, condensation, precipitation

22. it produces new substances

23. vinegar Bubbles when baking soda is added

24. steam

A balloon, inflated in an air-conditioned room at 27.0°C, has a volume
of 4.50.L. It is heated to a temperature of 57.0°C. What is the new
volume of the balloon if the pressure remains constant?

Answers

Answer:

4.95L

Explanation:

Using Charle's law equation;

V1/T1 = V2/T2

Where;

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the question, the following information was given:

V1 = 4.50L

V2 = ?

T1 = 27°C = 27 + 273 = 300K

T2 = 57°C = 57 + 273 = 330K

Using V1/T1 = V2/T2

4.50/300 = V2/330

Cross multiply

300 × V2 = 4.5 × 330

300V2 = 1485

V2 = 1485 ÷ 300

V2 = 4.95L

True or false, Henry Moseley discovered through X-Ray crystallography the number of neutrons that were present
in the nucleus of atoms of every element.

Answers

Answer:

Im pretty sure its true

Explanation:

Answer:

answer is true .

Explanation:

this may help you

Someone please do a True or false of all of these

Answers

Answer:

1. False

2. True

3. False

4. False

5. True

6. False

7. True

8. True

9. True

the liquid left after crystallization is

Answers

Answer:

The liquid left after crystallization is called Residue

Stae the change in oxidation state of iron during the reactiong of iron extraction

Answers

Answer:

Explanation:

The reaction for the extraction of Iron is :-

2Fe2O3(s) + 3C(s) → 4Fe(l) + 3CO2(g)

O.S. of Fe in Fe2O3 is 3 and O.S. of Fe(l) is 0

change in oxidation state (O.S.) = higher O.S - lower O.S

= 3 - 0

= 3

What are the uses of iron and it's reasons.

Answers

Answer:

Uses of iron

It is used to manufacture steel and also used in civil engineering like reinforced concrete, girders etc. Iron is used to make alloy steels like carbon steels with additives such as nickel, chromium, vanadium, tungsten, and manganese.

Answer:

iron is used to make water pipes.

used for making machines in industries.

used for making steam engine.

How much water will the measuring cup have if you poured 1/2 of it out?

Answers

The cup will be filled up halfway

help me please give two example in which physical change take place please help me

Answers

Answer:

Boiling, melting

Explanation:

Physical changes affect the form of a chemical substance.

please help. need this asap!!

Answers

Answer:

E.....Na2I.,.

Explanation:

Cuz sodium has a Vallency..1......lodide has Vallency 2

Why does every chemical reaction require a certain amount of activation energy?

Answers

Explanation:

Activation energy is the minimum amount of energy required for a chemical reaction to take place.

When a chemical reaction occurs then bonds between the reactants break and bonds between the products are formed. This leads to the formation of an activated complex which is also known as transition state.

So, in order to form the activated complex a minimum amount of energy is necessary and this energy is known as activation energy.

WHAT IS PHOTOSYNTHESIS??

Answers

Answer:

the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.

Answer:

convert 256 ml to kl

Answers

Answer:

0.000256

Explanation:

Formula:

Divide the value volume by 1e+6

1 kl equal to 1000000ml

sodium is more reactive than magnesium. Give reason

Answers

Answer: According to the reactivity of metals Sodium is the second metal while Magneesium is the fourth metal. The metal in the top of the reactivity serise table are more reactive.

(The series obtained by the arrangement of metals in the decending oder of their reactivity is the REACTIVITY SERIES TABLE)

Explanation:

Therefore Sodium is more reactive than Magnesium

Answer:

The alkaline-earth metals tend to lose two electrons to form M 2+ ions (Be2+, Mg2+, Ca2+, and so on). These metals are less reactive than the neighboring alkali metal. Magnesium is less active than sodium; calcium is less active than potassium; and so on. These metals become more active as we go down the column.

if you have a pop quiz and you get nervous is that unconditioned response? if yes why? if not what kind of response is it

Answers

No it’s a obligated response

An atom with 6 protons and 8 neutrons is an)

Answers

Answer: carbon (C)

Explanation:

can you answer with working out

Answers

This is your answer I hope it is right.

CAN SOMEONE PLEASE ANSWER THIS PAGE ILL GIVE YOU ALL MY POINTS

Answers

Answer: the equation for the reaction is NH4Cl (s) --> NH3 (g) + HCl (g)

equation for heat reaction:

ΔH25° = (ΔH25° NH3 + ΔH25° HCl) - ΔH25° NH4Cl)

question 2:

the 1st and 3rd reactions are better ontained through refrence sources and the 2nd and 4th are the easiest and safest to measure in the laboratory. The 1st and rd reaction contains noxious gases this is because there is a (g) in both of the reactions. And the 2nd and 4th does NOT contain noxious gases so i assume its the safest to measure out in the lab

Specific heat capacity is _____.

greater for metal than for wood

the amount of heat required to raise the temperature of 1g of a substance 1 oC

represented by the symbol, Q

all of these

Answers

Answer:

all of this

Explanation:

At a recycling plant, old tin cans are melted down and reconstructed. This is an example of a ___________.

Answers

It would be physical change. Because of its processing

If you produce 35.7 grams of sodium chloride how many molecules of Chlorine gas were
needed?
2Na + Cl2 --> 2NaCl
(PLS HELP ASAP)

Answers

Explanation:

I did it in steps to help u to understand :)

Identify each as measurement for area, volume, density, time, mass temp, length: ns, 12g/ml,
1.8pm, 250m2 ,325K and 5.4mL and 90kg

Answers

Answer:

ns - time

12g/ml - density

1.8pm - length

250m2 - area

325K - temperature

5.4mL - volume

90kg - mass

Explanation:

The unit of measurement is used to identify what a measurement is. It is very important to place a specific unit for each measurement made as it distinguishes them from one another. In this question, various measurements were given, which can be identified using their units.

- ns is measurement for time because seconds (s) is its unit

- 12g/ml is measurement for density because grams/milliliters (g/mL) is its unit

- 1.8pm is measurement for length because length can be measured in picometer (pm).

- 250m2 is measurement for area because metre² (m²) is its unit.

- 325K is measurement for temperature because Kelvin is the absolute unit for temperature.

- 5.4mL is measurement for volume because volume can be measured in milliliters (ml).

- 90kg is measurement for Mass because kilograms (s) is its unit.

According to kinetic-molecular theory, which of the following would not be considered an ideal gas? Check all that apply.

a gas at very high temperatures, when gas particles are moving very quickly

a gas at very low volumes, when gas particles are very close together

a gas at very low temperatures, when gas particles have very little kinetic energy

a gas at very low pressures, when gas particles are very far apart

a gas with highly polar molecules that have very strong intermolecular forces

Answers

Answer:

a gas at very low temperatures, when gas particles have very little kinetic energy

Explanation:

Answer:

B, C, and E!

Explanation:

got it correct on edge! :)

What kind of reactions are redox reactions

Answers

A reaction in which reduction and oxidation take place simultaneously known as a redox reaction.

Fe-54 = 5.845%
Fe-56 = 91.754%
Fe-58 = 2.119%

(Please help)
Calculate the average atomic mass/ given their percent abundance

Answers

Answer:

55.768

Explanation:

The following information is given in this question:

Fe-54 = 5.845%

Fe-56 = 91.754%

Fe-58 = 2.119%

First, we convert from percentage abundance to decimal abundance

Fe-54 = 5.845% = 0.05845

Fe-56 = 91.754% = 0.91754

Fe-58 = 2.119% = 0.02119

To find the average atomic mass of iron (Fe), we multiply each isotopes' decimal abundance by its mass no and find the sum as follows:

Average atomic mass = (0.05845 × 54) + (0.91754 × 56) + (0.02119 × 58)

Average atomic mass = 3.1563 + 51.38224 + 1.22902

Average atomic mass = 55.768

Other Questions

whats the distance between (-9, -6) and (-2, 2) What is the difference between a print and a one if a kind painting Look at the map.A map of the United notes titled Major Settlement Locations, 1960 to Present. Latino immigrants tended to settle in the southwest, Florida, Illinois, New York, and New Jersey. Asian immigrants tended to settle in Washington state, California, Nevada, Texas, Illinois, New York, and New Jersey.Based on the map, which region of the United States has the highest Latino population? What is the purpose of rhetoric in persuasive writing?O to distract the reader from a weak argumentO to affect the reader emotionallyto take the place of reasonO to build logical support for an argument Instructions: State what additional information is required in orderto know that the triangles in the image below are congruent for thereason givenReasory. AAS Postulate What is the conjugate of 3 + 6i?A -3 - 61B 3 - 6iC 3 + 6iD 9i 1) Read the line and answer the questions Has a snake ever coiled itself round any part of your body fell-blooded cobre a) Who is the speaker? b) Who did the speaker address? c) What is the speaker? Select the correct answer.What was the location of the attack that caused the United States to enter World War 11? .North AfricaO B. JapanFranceODHawallResetNext what is the definition of abuse what is the net charge of an ion that as 14 protons 16 electrons and 12 neutrons How do i say " I arrive at the airport in Lima, Per. I want to get to know the people here. I am going to travel to the beaches by car. There are gosh at the beach and i touch them. Per is very pretty, and i'm happy to spend time here." in spanish, please help DHL express deals with :a) Air freight of goodsb) petroleum products c) motorcycle company d) import and export good Which of the only four available pints of blood (A+, AB, B, and O+) should the patient receive for a transfusion?1. B-2. AB-3. A+4. O+ Differentiate between emperical andmolecular formula. Give an example ofa substance having different empericaland molecular formula Write the name of the definition, postulate, property or theorem that justifies the statement about the diagram. Could you please please help me with these questions this is my last attempt and it's due today The water level in a plastic pool changedby 8 gallons each hour due to a smallhole in the bottom. After 6 hours, the poolcontained 132 gallons. How much waterwas in the pool originally? Cul es la funcin y la importancia en los amigos en la vida Add :-a+2b-3c, -3a+b+2cand 2a -3b+c Revise this to be better: The individual has always had to struggle to keep from being overwhelmed by the tribe. If you try it, you will be lonely often, and sometimes frightened. But no price is too high to pay for the privilege of owning yourself. -Friedrich Nietzsche. Statistics show that individualism has increased by about 12% worldwide since 1960. In my opinion, being different is very important, because if you blend in so much with society you're not really your own person. Imagine not picking out what you would wear; you having to wear the same thing as everyone around you.