Can somebody plz help answer this question correctly!! (Only 1-2 sentences is good) thanks !!

WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD

Answer:

I think the answer is A) repeatedly testing the solubility at various temperatures

Explanation:

Answer:

blank 1 ----> 1

blank 2 -----> 1

blank 3 ------> 3

Explanation:

easy one!

Answer:

A. stimulants

Explanation:

Answer: radiation

Explanation: im not sure so dont take my word fot it

Answer:

CF₄

Explanation:

The molecular formula of the structure shown by the representation is given as:

     CF₄

The central atom is C and it is surrounded by 4 atoms of Fluorine.

Answer:

21 oxygen atoms

Explanation:

I think it is 7 but i am not sure

Explanation:

Answer:

maybe 16?

Explanation:

Answer/Explanation:

Wave W is being diffracted, Wave X is being reflected, and waves Y and Z are being refracted.

Answer:

Explanation:

Types of Chemical Reactions - Double Displacement Reactions.

NH₃ as the limiting reactant

Given

Reaction

4 NH3 + 5 O2 ⇒ 4 NO + 6 H20

Required

The limiting reactant

Solution

To find the limiting of the reactants, we can use the method by dividing the moles of each reactant by the reaction coefficient. The smallest ratio will be the limiting reactants

the mol ratio of NH₃ : O₂ =

=14/4 : 20/5

= 3.5 : 4

So NH₃ as the limiting reactant

1.54 x [tex]10^3[/tex] g is the mass of 4.60 x [tex]10^{25}[/tex] atoms of neon.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

1 mol of atoms = 6.02214076 × [tex]10^{23}[/tex]

Moles of neon in 4.60 x [tex]10^{25}[/tex] atoms = [tex]\frac{mass}{molar \;mass}[/tex]

[tex]\frac{4.60 X 10^{25}}{ 6.02214076 X 10^{23}}[/tex]

0.7638479709 = 76.38 mol

The molar mass of neon is 20 g/mol

76.38 mol x 20 g/mol

1.54 x [tex]10^3[/tex] g

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Answer:

Explanation:

Because the experiment has an different independent and dependent variable and each part has  a different result of what type of copper or what  type of control you are using for you experiment.

PLS MARK BRAINLIEST IF CORRECT I WORKED HARD ON THIS ANSWER,HAVE A NICE DAY/NIGHT <3

Answer:

Because the experiment has a different independent and dependent variable and each part has a different result of what type of copper or what type of control you are using for your experiment.

Answer:

MgO + H₂

Explanation:

The products of reaction is MgO  and hydrogen gas.

This is a single displacement reaction.

In this reaction, the possibility of the reaction is determined by position of the atoms on the activity series.

 Mg is higher than H on the activity series, so it is more reactive and it then displaces the hydrogen in water;

            Mg + H₂O → MgO + H₂

Answer:

subduction zone

Island Arc volcanoes

earthquakes

Answer:

A

Explanation:

I got done taking the quiz If I could Show U I would but the answer is a

Answer:

The answer is "They release the carbon that remains in the bodies of dead organisms.".

Explanation:

Answer: they all have 7  electrons they have different atom sizes

Explanation: hope it helps

Answer:

Acid rain's effect on stone is a chemical change.

Explanation:

Acid rain has hydrochloric acid which reacts with the calcium carbonate in the stone.

I hope this helps. (Sorry if i am wrong)

Answer:

Q = -4903.14 j

Explanation:

Given data:

Mass of water = 23 g

Initial temperature = 78°C

Final temperature = 27°C

Heat lost = ?

Solution:

Specific heat capacity of water is 4.18 J/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT =  27°C - 78°C

ΔT = -51°C

Q = 23 g × 4.18 J/g.°C  × -51°C

Q = -4903.14 j (negative sign shows heat is released)

Answer:

Photosynthesis takes place in the chloroplasts of the plant!!

Explanation:

I hope this helps!

Answer:

In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.

Explanation: oh oh i know this!!!!

These energy exchanges are not changes in kinetic energy. They are changes in bonding energy between the molecules. "If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance.

We are given:_______________________________________________

Volume of Gas (V) = 2.5L

Pressure (P) = 1.2 atm

Temperature (T) = 25°C  OR 25+273 = 298 K

Universal Gravitational Constant (R) = 0.0821

Solving for number of moles:___________________________________

From the Ideal Gas Equation,

PV = nRT

(1.2)(2.5) = n(0.0821)(298)           [plugging the given values]

n = [(1.2)(2.5)] / [0.0821*298]

n = 300 / [298*8.21]

n = 0.12 moles

Hence, there are 0.12 moles of Oxygen in 2.5L of 1.2 atm gas when the temperature is 25°C

Answer:98

Explanation:X/423 = 75.0/323 X = 98

Considering the Charles' Law, the original volume is 98.22 mL.

Charles' Law consists of the relationship that exists between the volume and the temperature of a certain amount of ideal gas, which is maintained at a constant pressure.

This law states that for a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of movement that they have. the gas molecules. That is, the volume is directly proportional to the temperature of the gas.

Mathematically, Charles' law states that the ratio between volume and temperature will always have the same value:

[tex]\frac{V}{T}=k[/tex]

Considering an initial state 1 and a final state 2, the following is true:

[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]

In this case, you know:

Replacing in Charles's law:

[tex]\frac{V1}{423 K}=\frac{75 mL}{323 K}[/tex]

Solving:

[tex]V1=\frac{75 mL}{323 K}423 K[/tex]

V1= 98.22 mL

In summary, the original volume is 98.22 mL.

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Answer:CH

Explanation:it’s simply has the answer in the question. It’s just throwing you off with the percentages.

Answer: False

Explanation: False. Replication. The process of DNA copying itself begins when the two sides of the DNA molecule unwind and " separate ".

Answer:

Hydrogen = element

Carbon dioxide = compound

Water = compound

Zinc = element

Nitrogen = element

Salt = compound

Helium = element

Carbon monoxide = compound

Explanation:

An element and a compound are different when it comes to the types of atoms they possess. An element has only one type of atom while a compound has two types of atoms. For example, Hydrogen is an element because it has two atoms of the same type and that is, the "Hydrogen atom."

On the contrary, Carbon dioxide has one carbon atom and two atoms for Oxygen. Therefore, it is a compound because it has two types of atoms: Carbon atom and Oxygen atom.

Water has two atoms of Hydrogen and one atom of Oxygen. Therefore, it is a compound because it has two types of atoms: Hydrogen atom and Oxygen atom.

The order of the radiations from longer wavelength to shorter wavelength is as follows:  Radio waves , microwave, infrared, visible light, ultraviolet, X-rays and gamma rays. In these order the blanks have to be filled.

Electromagnetic spectrum is the arrangement of radiations in the order of decreasing wavelength or increasing frequency. Frequency is the number of wave cycles per unit time.

All the electromagnetic radiations are transverse waves. Wavelength of an electromagnetic radiation is the distance between two consecutive crests or troughs or the waves.

As the wavelength increases frequency and energy of electromagnetic radiations decreases. The longest wave is radio waves.Shortest wave is gamma rays.

The given image of wave is from longer wavelength to shorter wavelength hence the radiations can be arranged as : Radio waves , microwave, infrared, visible light, ultraviolet, X-rays and gamma rays.

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Answer:

speed = distance/time

100 yards =91.5 metres

=91.5/12=7.625m/s

Answer:

17.05 MPH or 7.62 MPS

Explanation: I am not sure what one you are wanting, either in miles per hour or meters per second