How does the parts of a seed help it carry out its function please try to use your own words it’s for my lab..

Answer:

m=0.000107 kg

Explanation:

H=m*cp*change in temperature

0.296=m*4182*0.661

m=0.000107 kg

An aqueous solution contains the following ions Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ and more than one precipitate will form are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.

Precipitate is the insoluble compound which is present at the bottom of any chemical reaction in the solid state.

If in an aqueous solution Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ ions are present then:

Hence precipitates are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.

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The pair in which former is stronger nucleophile than later in polar aprotic solvent is CH₃NH₂ and (CH₃)₂NH. The correct option is A.

Nucleophiles are molecules that have a pair of electrons that can be shared. They are also called electron rich species.

Polar aprotic solvents are incapable of forming hydrogen bonds with the substrate. They don't have any hydrogen atoms directly connected to an electronegative atom, so they can't form a hydrogen bond.

Acetone, chloroform, dichloromethane, and other aprotic solvents are examples.

Thus, the correct option is  A. CH₃NH₂ and (CH₃)₂NH.

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The quantity of carbon tetrachloride, CCl₄ she will use to make her conversion is molar mass

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

Mole = mass / molar mass

Mole of CCl₄ = 150 / 154

Mole of CCl₄ = 0.974 mole

Thus, we can see that the molar mass of CCl₄ is needed to obtain the number of mole.

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Answer:

It's 1, places that are closer to the equator receive more direct sunlight and have

Explanation:

Using the ideal gas law PV =nRTPV=nRT , we find that the pressure will be P =\frac{nRT}{V}P=

V

nRT

​

 . Then, we'll substitute and find the pressure, using T = -25 °C = 248.15 K and R = 0.0821 \frac{atm\cdot L}{mol \cdot K}

mol⋅K

atm⋅L

​

 :

P =\frac{nRT}{V} = \frac{(0.33\,\cancel{mol})(0.0821\frac{atm\cdot \cancel{L}}{\cancel{mol \cdot K}})(248.15\,\cancel{K})}{15.0\,\cancel{L}} = 0.4482\,atmP=

V

nRT

​

=

15.0

L

​

(0.33

mol

)(0.0821

mol⋅K

atm⋅

L

​

​

)(248.15

K

​

)

​

=0.4482atm

In conclusion, the pressure of this gas is P=0.4482 atm.

Reference:

Chang, R. (2010). Chemistry. McGraw-Hill, New York.

Voltage-gated sodium channels are the ion channels that conduct sodium ions. They are sensitive to the extracellular concentration of calcium ions.

Voltage-gated sodium channels are the signaling ion channels that are responsible for increasing the action potential of the nerve cells. VGSC is the most important resting and action potential of the cell.

These channels are sensitive to the high concentration of calcium ions as these ions cause the channels to open up on the membrane surfaces of the cell. This causes a change in the concentration of the gradient across the membrane.

Therefore, VGSC is sensitive to calcium ions.

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Answer: Milligrams

Explanation:

Vitamins are measured in Milligrams because if used grams, there would be a higher dose.

The pH of a solution that has a H⁺ ion concentration is 0.0039M is 2.4.

pH of any solution gives idea about the acidity or basicity of solution and it will be calculated as:

pH = -log[H⁺]

Given that, concentration of H⁺ ion = 0.0039 M

On putting tis value in pH equation, we get

pH = -log(0.0039)

pH = -(-2.4) = 2.4

Hence required value of pH is 2.4.

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Answer:

Explanation:

By definition 3 moles of water molecules. Or about 3 * 6.022140E23 water molecules = 1.806642E24 water molecules.

hope this is right..

Answer: Simply multiply Avogadro's number(6.02x10^23) by 3 and that's your answer. Use a scientific calculator

Explanation:

When for a solution concentration of hydroxide ions becomes equal to the concentration of hydronium ions, its pH becomes equal to 7.

pH of any solution is used to define the acidity, basicity or neutrality of the solution.

When the concentration of hydronium ion is equal to the concentration of the hydroxide ion then the resultant solution will be neutral, as they have a pH equals to 0.

Hence, pH of the solution becomes equal to 7.

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Answer:

False

Bouyant force = volume of displaced fluid * density of fluid

Answer:

Long answer

Proteins are the building blocks of the body, each and every organ muscle and skin and cells are made of proteins. They can also be used for providing energy to the body in a state where other energy sources aren't available.

Fats are stored energy blocks which can be used by the body at its own convenience whenever there is a deficit of energy in the body. They can also be directly burnt to give energy in cases where energy needs of the body are not met by dietary intake

Carbohydrates are the most convenient and preferable source of energy in the body and are easily converted to give out immidiate energy to the body, excess carbohydrates can be converted into fats and stored for later usage as and when required by the body.

Proteins, fats and carbohydrates have many secondary functions and roles in the human body. If you are keen to know anything more specific feel free to ask.

Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.

Answer:

Most Nutrients are digested into easy and simpler compounds. Carbohydrates are used for energy . Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.

Answer:

When chlorine (Cl 2 ) gas is passed through an aqueous solution of potassium iodide (KI), the products formed are solid iodine (I2) and potassium chloride (KCl). This is a displacement reaction in which the less reactive iodine in potassium iodide is displaced by the more reactive chlorine. The equation can be written as:

2KI(aq)+Cl2(g)→2KCl(aq)+I2 (s)

Answer:

the 3 in the middle

Explanation:

There are 5 signs of chemical changes these are odor change,color change, temperature change, production of gas and creation of precipitation.

The molarity of solution which is prepared by dissolving 7. 31 g of Na₂SO₄ in enough water to make 225 ml of solution is 0.22M

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

M = n/V, where

n = W/M, where

n = 7.31/142 = 0.05 mol

On puttig values, we get

M = 0.05 / 0.225 = 0.22M

Hence required molarity is 0.22M.

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Answer:

b

Explanation:

b is the answer to your question

Answer: 56.5 J

Explanation:

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Answer: 1.14 M

Explanation:

500 mL is equal to 0.5 L.

So, the molarity is (0.570)/(0.5) = 1.14 M

Answer:

D

Explanation:

1/2 will be lit with 'daylight' and the other half will be dark

The amount in grams of oxygen are needed to react with 25g of Mg is 16.48 grams.

Mass into moles or vice versa of any substance will be calculated by using the below formula as:

n = W/M, where

W = given mass

M = molar mass

Moles of Magnesium = 25g / 24.3g/mol = 1.028 = 1.03 mol

Chemical reaction will be:
2Mg + O₂ → 2MgO

From the stoichiometry of the reaction it is clear that 1 mole of oxygen is reacts with 2 moles of magnesium, so 1.03 moles of magnesium will reacts with (1/2)(1.03) = 0.515 moles of oxygen.

Mass of oxygen = (0.515mol)(32g/mol) = 16.48g

Hence required mass of oxygen is 16.48 grams.

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Sorry this is late but the molecules in the substance will move much slower and take up less place as a molecule that moves faster will take up more space

Hope this helps :))

A car bumper is primarily meant to reduce the impact of damages to the front and rear ends of vehicles in case of collision.

Cars are equipped with bumpers both at the rear and front ends primarily for protective purposes.

The front end bumper reduces the impact of front collisions on the cooling system and the bonnet while the rear end bumper functions to protect the exhaust, the trunk, and several other parts in case of rear-end collisions.

Aside from protective functions, bumpers also serve to add beauty to cars.

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That's correct! When two different air masses meet, the boundary zone between them is called a front. The process of formation of the fronts is known as frontogenesis.

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Hope this helps! :)