What is a physical change?

Answer:

A) Which brand and amount of fertilizer will work best?

Explanation:

A) is the best answer because it takes into account all of the variables. The variables seem to be the amount of fertilizer, average plant growth, and brand of fertilizer. The independent variables are amount of fertilizer and fertilizer brand. The dependent variable is the plant growth.

B) is not the best answer because it does not include the amount of fertilizer. Because this variable is changing, it is important to consider.

C) is not the best answer because it does not take the type of fertilizer into account. If the researcher were only concerned with how the amount of fertilizer affects plant growth, it would not be necessary to include 3 different types of fertilizer.

D) is not the best answer because this doesn't explain why the researcher used different types of fertilizer.

Answer:

Selective Breeding

Weeds are bad,

But why is this so?

Just like grass,

They too grow.

Weeds are disliked,

Like the drink that's spiked.

But why is this so?

Who's to say they shouldn't grow?

The weed is unwanted,

Like a murderer hunted.

But what crime did it commit?

Why should it not, be free to sit?

Thickly they may grow,

But grass even more so.

Who's to say they should not grow?

Why should their seed not be sow?

Weeds are bad,

But why is this so?

Just like grass,

They too grow.

If all things living, were for cared,

The land we own, for all shared.

The weed let live,

And life not carefully selected by- siv.

Selective breeding is unfair,

No better than plain warfare...

Explanation:

Answer:

pV= nRT

Explanation:

(p1 × V1)/ T1/ (p2 × V2)/ T2

Answer: 4.6 M

Explanation:

Converting 25 g of HCl to moles, we get 25/36.46 = 0.68568294020845 moles.

Also, 150 mL = 0.150 L

So, the concentration is:

[tex]\frac{0.68568294020845}{0.150} =\boxed{4.6 \text{ M}}[/tex]

Answer:  

Part 1.  First, you find the Moles.

Part 2. The correct setup for finding the moles is: 25g  HCI x 1mol HCI/36.46g HCI

Part 3. The correct setup to find liters is: 150 mL x 1L/1000mL

Part 4. The molarity of this solution is: 4.6 M HCI

Explanation:

just listen lol

Answer:

It would decrease.

Explanation:

This is because there is not enough food (ant) for the ant-lion group.

Answer:

Explanation:

3.81 m. = 150 inches.

I can't find explanation. Hope this is my best!

Answer:

Explanation:

Explanation

There is a Plus charge on one of them (I think it is likely the wool).

There is a minus charge on the other one (So it is cotton most likely.

The point is that like charges repel (move away from each other)

Unlike charges attract. (move close to each other.)

You  have a case of unlike charges attracting.

Answer:

2C8H18+25O2→16CO2+18H2O.



Answer:

In CO there is one mole of Carbon and one mole of Oxygen so the number of atoms will be for two mols

Explanation:

The statement that is a characteristic of water is strong cohesion. Details about characteristics of water can be found below.

Water is a unique molecule which is attributed to its unique characteristics or features.

Water is made up of two hydrogen atoms and one oxygen atom that are chemically bonded to one another.

Some of the characteristics of water are as follows:

Therefore, the statement that is a characteristic of water is strong cohesion.

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A given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.

The states of matter refer to the separation of the molecules of a given material in certain temperature conditions.

The states of the matter are three and include the gaseous state, liquid state and solid-state.

In conclusion, a given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.

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The non-contact forces portfolio includes Gravitational force, Magnetic force and Electrostatic force.

Non contact forces are those forces which are applied on any object without any physical interference or contact.

Some non-contact forces are:

Hence Gravitational force, Magnetic force and Electrostatic force are the non-contact forces.

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Based on the percentage of people that prefer to swim on weekends, the probability that a female who prefers swimming on weekends is picked is 0.40.

This can be found by the formula:

= Percentage of females who prefer swimming on weekends / Percentage of those who swim on weekends

Solving gives:

= 10% / 25%

= 0.40 or 40%

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The balanced equation for the combustion of biodiesel is CH₄ + 2O₂ = CO₂ + H₂O.

Combustion reaction is the reaction in which a substance react with oxygen to produce energy and heat. It is an exothermic reaction.

The combustion of biodiesel with oxygen form carbon dioxide and water.

Thus, the  balanced equation for the combustion of biodiesel is CH₄ + 2O₂ = CO₂ + H₂O.

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The ΔH fusion used to calculate the energy released when a mass of liquid freezes by using the formula Grams liquid x mol/g x ΔH fusion.

The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.

Heat of formation or enthalpy is given for any one mole of substance.

And it will be calculated for moles of gases as, so for this first mass will be converted into moles as-

n = W/M, where

W = given mass in grams

M = molar mass in g/mol

and then multiply the given moles by the enthalpy of formation of one mole.

Hence, Grams liquid x mol/g x ΔH fusion is used.

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Answer:

ANSWER

Explanation:

Answer:

If 50.0 grams of HCl were dissolved in enough water to make a solution with a total volume of 5.0 liters, then the molarity of the solution is 0.282M.

How do we calculate molarity?

Molarity of any solution will be calculated by using the below equation:

M = n/V, where

n = moles of solute

V = volume of solvent in L

Moles will be calculated by using the below equation:

n = W/M, where

W = given mass = 50g

M = molar mass = 35.45 g/mol

n = 50/35.45 = 1.41 moles

On putting values in the above equation, we get

M = 1.41mol / 5L = 0.282M

Hence required molarity of solution is 0.282 M.

Explanation:

The earth's first oceans would have obtained freshwater as a result of the condensation of water vapor in the atmosphere back then.

The freshwater of oceans was hypothesized to have been formed by the condensation of water vapor present in the early atmosphere of the earth.

The water vapor was thought to have emanated from volcanic activities. The condensation was in the form of rain and the resulting puddles merged together to form the oceans.

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The advantage of Bronsted-Lowry base theory over the Arrhenius base theory is that the Bronsted-Lowry bases can act as proton acceptors.

According to the definition of Bronsted-Lowry, a base is a proton acceptor. In that case, the concept of bases is not limited to only the hydroxide ions.

Thus the advantage of Bronsted-Lowry base theory over the Arrhenius base theory is that the Bronsted-Lowry bases can act as proton acceptors.

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Answer:

it dissolve faster in higher temperature hope it's right

Explanation:

option option B is the correct answer of given statement helium-4(He)=2

Answer:

The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The mass number is different for each different isotope of a chemical element.

Answer:

C

Explanation:

Adding and acid and base together until it is completely neutralized will give us water and a salt.

For example:

HCl + NaOH --> NaCl + H2O

HCl being the acid

NaOH being the base

The H2O is water

The NaCl is the salt

The number of moles of  Fe₂O₃ that must react to produce 760 kg of Fe are 20.503

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

The reaction is [tex]\rm Fe_2O_3 (s) + 3CO (g) ----- > 2Fe (l) + 3CO_2[/tex]

The mass of Fe is given 760 kg

The molar mass of Fe is 55.9 g/mol

To calculate the number of moles

[tex]n = \dfrac{m}{M} \\\\n = \dfrac{760000}{55.9 g/mol} = 13,669[/tex]

Now, the ratio between Fe and O is 2 : 3

[tex]\dfrac{13,669}{2} \times 3 = 20,503.5[/tex]

convert it into kg = 20.503 mol

Thus, the moles are 20.503 mol

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Antibodies are part of the human immune system. Basically, they identify bad bacteria and viruses and track them down to fight back.

Answer:

Explanation:

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[tex]\\ \purple{MaggieEve}[/tex]

Answer:

3.125g

Explanation:

100/2
50   1
50/2
25    2
25/2
12.5   3
12.5/2
6.25   4
6.25/2
3.125g   5