pls help me i really need the answer see it and do it

Answer:

The warmer, lighter air rises, bringing cooler, heavier air to low altitudes.

Air at higher altitudes doesn't have as much air weighing down on it from above.

Explanation:

In short - air pressure is the result of the cumulative force that air molecules act on objects below them due to Earth's gravity. The higher the altitude, the less air molecules there are to act a force below them, and therefore, there's less air pressure at higher altitudes.

Answer:

I believe it's the second option "Lighter air molecules float above heavier air molecules

Explanation:

I believe this because as altitude increases the amount of gas molecules decrease which makes the air less dense

Answer:

the total number of protons and neutrons in a nucleus.

The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.

The calorific value of the tablespoon of cookie dough is 58.7 Calories per gram.

We have the following information from the question;

Mass of the cookie dough =  12.99 g

Heat capacity of the calorimeter = 72.49 kJ/∘C

Temperature rise = 25.23 ∘C - 21.84 ∘C = 3.39∘C

H =  12.99 g × 72.49 × 10^3J/∘C ×  3.39∘C

H = 3.19 × 10^6 J or 762.4 Cal

1 g produces 762.4 Cal/ 12.99 g = 58.7 Calories per gram

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Answer:

When using acids and bases, note that these substances are  

corrosive

. Make every effort to avoid contact with  

the skin and lab surfaces

. Be sure to wipe up any spills immediately

Explanation:

When using acids and bases, note that these substances are corrosive. Make every effort to avoid contact with the skin and lab surfaces. Be sure to wipe up any spills immediately.

An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.

A base is a molecule or ion able to accept a hydrogen ion from an acid.

Acids and bases are corrosive in nature, they give a burning sensation when it comes in contact with skin, so handle this substance with care.

Due to their corrosive nature, Make every effort to avoid contact with the skin and lab surfaces.

Acid spills should be neutralized with sodium bicarbonate and then cleaned up with a paper towel or sponge. Do not use a strong base, such as sodium hydroxide, to neutralize a strong acid like hydrochloric acid.

Acids and bases neutralize each other, forming salt and water. A strong acid-strong base neutralization results in a neutral solution with a pH of 7.

Therefore, When using acids and bases, note that these substances are corrosive. Make every effort to avoid contact with the skin and lab surfaces. Be sure to wipe up any spills immediately.

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1. Combination between two elements :

2H2(g) + O2(g)⸻➤2H2O(l)

N2(g) + 3H2⸻➤2NH3(g)

C(s) + O2(g) ⸻➤CO2(g)

The combination reactions as shown in which a new compound is formed from its constituent elements are also called synthesis reactions.

2. Combination between two compounds-

CaO(s)+ H2O(l)⸻➤Ca(OH)2(aq)+ heat

quicklime⠀⠀⠀⠀⠀slakedlime

3. Combination between an element and a compound :

2CO(g)+O2(g) ⸻➤2CO2(g)

2NO(g) + O2(g) ⸻➤2NO2(g)

bobbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

Answer:

hello hi what's up

Explanation:

ok bye

Answer:

to make it cold

Explanation:

Answer:

Explanation:

Find 1 mole of HClO

1 mol HClO = 52.5 grams

Set up a proportion

1 mol / 52.5 = x / 1.30 * 10^8           Cross multiply

52.5 * x = 1.30 * 10^8                       Divide by 52.5

x = 1.30 * 10^8 / 52.5

x = 2.476 * 10 ^6 moles

Answer: B and C

Explanation:usatestprep

The solubility of a substance depends on both physical and chemical properties of that substance. Here the greater the surface area, the powder, the more readily the solid dissolves and also increases with the temperature. The correct options are B and C.

The maximum amount of the solute which can dissolve in a known quantity of the solvent at a certain temperature is defined as the solubility. The rate of dissolving depends on the surface area, temperature and the amount of stirring.

The increase in the surface area of the solute and temperature increases the rate of dissolving.

Thus the correct conclusions are B and C.

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#SPJ2

Answer:

Ammonia | NH3 or H3N | CID 222 - structure, chemical names, physical and chemical ... Ammonia, 0.5M solution in 1,4-dioxane, AcroSeal(R) ... 3.2.2Color/Form.

Explanation:

The chemical formula for ammonia is NH3. It has many names including hydrogen nitride, Nitrosil, and Vaporole. Its molar mass is 17.0306 g/mol[1]. Ammonia has a Page 3 strong pungent odor.

If hexane and dichloromethane are being mixed up together i.e if dichloromethane is added first, the impurities will mix together and it will be difficult and unable to separate.

Hexane and dichloromethane are two different solvents with different properties used in column chromatography. While hexane is polar in nature dichloromethane occurs to be a non-polar solvent.

The best way to run this process in the column is to first add hexane, followed by gradual addition of dichloromethane. This will help to separate and distinguish each compound in the mixture.

However, if dichloromethane is added first, the compound will get eluted and there wlll be no separation. The only solution will be to evaporate the solvent and run the column once again with the steps explained above.

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D .

Explanation: Hade the test hope this helpsss

Answer:

Didn’t give me a picture m8???

Answer:

i need pictres to solve

Explanation:

Answer:

I think it's the second option

Explanation:

I'm just taking a stab in the dark here, so to speak

Sound waves travel at different speeds when traveling through different materials because sound has different speeds in different media.

Sound is a type of wave that is propagated in compression and rare factions. When sound is propagated, it produces a sensation when it impinges on the ears.

The speed of sound through various media is different. The difference in the speed of sound in various media results in the fact that sound waves travel at different speeds when traveling through different materials.

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Answer:

K and Br

Explanation:

K and Br would form an ionic bond because K (potassium) is a metal and Br (bromine) is a nonmetal. Ionic bonds are created between metals and nonmetals.

Answer:

3.0 M

Explanation:

The molarity formula is M = n/v

where M is the molarity, n is the number of moles, and v is the volume in litres.

step 1: convert the grams of KNo3 to moles. To convert grams to moles, divide by the molar mass.

(30 g divided by 101.103 g/mol) = 0.296 moles

step 2: convert the volumes to Litres. 100 mL is 0.1 L

step 3: apply the formula. Molarity = (0.296 mol / 0.1 L) = 2.96 mol/L

We will round our answer to 3.0 M

Answer:

Atoms form chemical bonds to satisfy the octet rule and to become stable.

Answer:

ATGGCTGTTGTGTAA

Explanation:

Answer:

c. rising and lowering objects

Answer:

Preparation. Copper(I) iodide can be prepared by heating iodine and copper in concentrated hydriodic acid, HI. In the laboratory however, copper(I) iodide is prepared by simply mixing an aqueous solution of potassium iodide and a soluble copper(II) salt such copper sulfate.

Answer:

Very good :)

Explanation:

Answer:

let a real person help u...

The change in internal energy of the system = -772kJ

Explanation:

Heat lost by the system , a = -266KJ

Workdone by the system, W = -506KJ

The first law of thermodynamics states that:

Change in internal energy = q + w

Substituting values into the equation

Change in internal energy = (-266KJ) + (-506KJ)

Change in internal energy = -722KJ

Answer:

I say both I hope this helps

check the image i sent you.

Answer:

32

Explanation:

Principal quantum number=n=4

Maximum number of electrons:-

[tex]\\ \sf\longmapsto 2n^2[/tex]

[tex]\\ \sf\longmapsto 2(4)^2[/tex]

[tex]\\ \sf\longmapsto 2(16)[/tex]

[tex]\\ \sf\longmapsto 32[/tex]

Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 25 × 10 × 230 = 57,500

We have the final answer as

Hope this helps you

Answer:

2NaI(aq)+Hg2(C2H3O2)2(aq)→2NaC2H3O2(aq)+Hg2I2(s)

Explanation:

Answer:

The magnets will push away from each other.