Help me please I really need this tomorrow

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

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

Answers

Answer: i dont know

Explanation:

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

Answers

The cup will be filled up halfway

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

An atom with 6 protons and 8 neutrons is an)

Answers

Answer: carbon (C)

Explanation:

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 ...

convert 256 ml to kl​

Answers

Answer:

0.000256

Explanation:

Formula:

Divide the value volume by 1e+6

1 kl equal to 1000000ml

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:

please help. need this asap!!

Answers

Answer:

E.....Na2I.,.

Explanation:

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

What kind of reactions are redox reactions

Answers

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

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  

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

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

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! :)

the liquid left after crystallization is​

Answers

Answer:

The liquid left after crystallization is called Residue

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 :)

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.

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.

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

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

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.

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.

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

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:

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.

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 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.

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

can you answer with working out ​

Answers

This is your answer I hope it is right.

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:

K

Na

Ca

Mg

Al

Zn

Fe

Sn

Pb

H

Cu

Hg

Ag

Pt

Au

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.

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

Answers

Answer:

3

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 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

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