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Answer:

Explanation:

We know that for every mole of nitrogen consumed, 3 moles of hydrogen are consumed.

So, hydrogen is the limiting reactant, and if 10 moles of hydrogen are used, then the reaction will occur 3.33 times.

Hence, this means there is enough nitrogen left for the reaction to occur another 0.67 times, and hence 0.67 moles of nitrogen will be left over.

In acidic solution, [H₃O ] > [OH⁻]. The correct option is C.

Hydronium ion is the simplest form of oxonium ion, and it is derived from the protonation of water. It is produced by dissolving the Arrhenius acid in water.

Hydroxide ion is a diatomic anion formed with oxygen and hydrogen with single covalent bond.

The concentration of hydronium ions in an acidic aqueous solution will be higher than the concentration of hydroxide (OH-) ions.

Thus, the correct option is C, [H₃O ] > [OH⁻].

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Seven diatomic elements are H₂, Cl₂, N₂, F₂, Br₂, I₂ and O₂.

Diatomic molecules are those molecules in which two atoms of same elements are present, and they are combined to attain the stability.

The seven diatomic molecules which are exist in the chemistry are:

Hence H₂, Cl₂, N₂, F₂, Br₂, I₂ and O₂ are 7 diatomic molecules.

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Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles , Option D is the correct answer.

What is an insulator ?

Insulators are those substances that do not conduct heat or electricity like their conductor counterparts.

Conduction of electric charges is as a result of the free flow of electrons in the atom of the substance.

Hence, a good insulator holds on tightly to its electrons and prevent them from flowing freely to conduct electric charges.

Therefore, Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles.

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B. Atoms in glass hold tightly to their negatively charged particles

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when the waves pass from the deeper water to the shallower water its speed will decrease.

Refraction of wave is the change in direction of a wave passing from one medium to another caused by its change in speed.

For example, waves travel faster in deep water than in shallower water.

Thus, we can conclude that when the waves pass from the deeper water to the shallower water its speed will decrease.

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Answer: The circulation around the Hadley cells

Explanation:

The world's deserts are typically found at 30°N and 30°S latitudes because of the circulations around the Hadley cells. Thus, the correct option is B.

Within each cell, the air moves in a circular motion. Taking the Hadley cell, the warm air at the equator (0° latitude) rises and then cools down in the upper atmosphere, and then circles back down towards the tropics of around 30° latitude.

As the air leaves equator, it rains away more moisture, becoming denser and slightly cooler in temperature, until it finally dry, sinks, and creates the arid bands where many of the world's famous deserts lie. This giant atmospheric conveyor belt, is called a Hadley cell, brings both the tropical rain forests and deserts.

Therefore, the correct option is B.

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Answer:

they are opposite in function

Explanation:

voltaic cell converts chemical energy to electrical energy through redox reactions i.e reduction-oxidation reaction while the electrolytic cell converts chemical energy to electrical energy.

The volume of a gas is 605 liters at 27.0°C and the new temperature is -3.0°C, so the resultant volume of the sample is 544.53L.

Relation between the volume and temperature of the sample of gas is represented by the ideal gas equation PV = nRT, and for the question required equation is:

V₁/T₁ = V₂/T₂, where

V₁ & T₁ are the initial volume and temperature of the gas.

V₂ & T₂ are the final volume and temperature of the gas.

On putting values from the question on the above equation and by converting temperature into Kelvin, we get

V₂ = (605)(270.15) / (300.15) = 544.53 L

Hence required volume of the sample is 544.53L.

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The work w required to pump the water out of the spout will be 705600 joules.

Work done is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.

Work against gravity is done on a thin layer of liquid with a width of y. The vertex of the trough serves as the center of our coordinate system.

It is obvious that the cross-section of the triangle has length y at a height y. A thin layer at height y is a rectangular box with a volume of 8 y , and lifting it requires a force equal to;

[tex]\rm F= \rho gV \\\\\rm F= 9.8 \times 10000 \times 8y \triangle y \\\\[/tex]

The work on the layer is;

[tex]\rm W= 78400 y \triangle y [4-y]\\\\\ W= \int\limits^3_0 {x} \, dx \\\\\ W= \int\limits^3_0{78400y[4-y]} \, dx \\\\\ W=705600 \ Joule.[/tex]

Hence, the work w required to pump the water out of the spout will be 705600 joule.

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Explanation:

Less water is reabsobed into the blood.

if it is a low water blood the blood glucose level are regulated by the liver and pancreas

Explanation:

Speed is the rate of an object moving along a path, whereas velocity is the direction of motion

Electricity is the flow of electric charge

Answer:

Describe the scientific method/process and list its steps:

The scientific method consists of six steps:

1. Define purpose

2. Construct hypothesis

3. Test the hypothesis and collect data

4. Analyze data

5. Draw conclusion

6. Communicate results

But what is it?

The scientific method is a process with the help of which scientists try to investigate, verify, or construct an accurate and reliable version of any natural phenomena.

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Define speed and velocity:

Speed is the quantitative measure of how quickly something is moving. Velocity defines the direction of the movement of the body or the object. Speed is primarily a scalar quantity. Velocity is essentially a vector quantity. It is the rate of change of distance.

List the three Laws of Isaac Newton and provide an example for each law.

1 -  An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.

(example: A coin put on top of a paper on the table will stay in place when the paper is pulled.)

2 - That force is equal to the change in momentum per change in time. For a constant mass, force equals mass times acceleration, i.e. F = m*a.

(example: A truck which carries less mass will have a bigger acceleration that a truck which carries more mass)

3 - States that for every action there is an equal and opposite reaction.

(example: Our hand feels pain when we hit the table because the table gives force as a reaction to our hand)

List the two types of waves.

1. Mechanical Wave -->  A mechanical wave is a wave that is an oscillation of matter and is responsible for the transfer of energy through a medium.

2. Electromagnetic Wave -->  Electromagnetic waves are created by a fusion of electric and magnetic fields. The light you see, the colours around you are visible because of electromagnetic waves.

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What is electricity?

Electricity is the flow of electrical power or charge.

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Discuss what is electromagnetism.

Electromagnetism is a branch of physics that is about the electromagnetic force that is between electrically charged particles. Electromagnetism is the basic reason why the electrons are bound to the nucleus and responsible for the complete structure of the nucleus!

The temperature of the ideal gas is 7.235 K.

The temperature of the ideal gas is calculated as follows;

PV = nRT

T = PV/nR

where;

T = (175 x 0.275) / (0.8 x 8.314)

T = 7.235 K

Thus, the temperature of the ideal gas is 7.235 K.

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Answer:

7.2 k

Explanation:

edge

The reaction of acids with alkalis or bases forming salts is called neutralization reaction. Neutralization reaction remove the acidity or basicity of the substance.

There are various kinds of reaction namely substitution reactions, displacement reactions, combination reaction, neutralization reactions, oxidation etc.

Neutralization reactions are those where, an acid neutralizes a base or vice versa. The product obtained will be neutral thus having no acidity or basicity as the name suggests.

For instance when HCl reacts with the base NaOH, the salt NaCl is formed which is neutral thus having the pH value of 7. Similarly, Acetic acid and KOH reacts together to form potassium salt of acetic acid or potassium acetate. These are all neutralization reactions.

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The pH of a solution with [H₃O⁺] = 2.3 × 10⁻⁴M is 3.64 means the solution is acidic in nature.

pH of any solution is define as the negative logarithm of the concentration of hydronium ion as:

pH = -log[H⁺]

Given that concentration of H₃O⁺ or H⁺ = 2.3 × 10⁻⁴M

On putting values, we get

pH = -log(2.3 × 10⁻⁴)

pH = -(-3.64) = 3.64

Hence required pH value is 3.64.

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Answer:

Pretty sure its C.

Explanation:

Carbon dioxide is known for trapping heat in the Earth's atmosphere so this makes sense.

Hope this helped!

The reaction of sodium bromide with chlorine gas is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).

Sodium bromide is an inorganic compound, white, crystalline with high melting point.

The reaction between halogens is redox reaction

Oxidation  – 2Br⁻ ? Br₂ + 2e⁻ loss of electron.

Reduction – Cl₂ + 2e⁻ ? 2Cl⁻ gains of electron.

Thus, the correct option is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).

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Answer: 0.81

Explanation:

Q=mcΔt

Q=50 x 4.186 x 15

Q = 3139.5 J

Answer:

h=5000j

change in temperature=20k

m=3kg

using C=H÷M×Change in temperature

C=5000÷3×20

C=5000÷60

C=83.33jkg-1k-1

The mass of the N₂O in the given question is 92.4g.

STEP1- Apply the ideal gas equation

            PV=nRT

STEP2- Put the given values in the equation

            P=130kPa,     T=298K,     V=40L  R=8.31

STEP3- Solve the equation

           N=PV/RT,

           N=130×40/8.31×298

             N=2.1moles

             N=mass/molecular mass

             mass=2.1×44

            mass = 92.4g

Hence, the mass of N₂O is 92.4g.

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Answer:

D

Explanation:

This question is a little strange. C and D are very similar, but I would pick D.

Fluorine actually has the highest electronegativity of all the elements. This allows it to pull more electrons towards itself. Since electrons have a negative charge, this causes the fluorine end of the molecule to be more negative while the hydrogen is left striped of electrons and has it positively charged necleus exposed. This means that one end of the molecule is positive while the other is negative, which makes this molecule polar. The only reason I would pick D over C is that D addresses the second part of the question about the covalent bond. A covalent bond is simply when two atoms share electrons.

Let me know if this was right and I hope it helps.

Answer:

a vaccine is a needle they give in your arm.

Explanation:

Answer:

it would be 25% sorry if I'm wrong

Ethylene is a compound in which two carbons are double-bonded to each other and bonded to 2 hydrogen atoms.

Ethylene has a chemical formula [tex]C_2H_4[/tex].

Thus, the 2 carbon atoms are bonded to one another by a double bond. Each of the carbon atoms then bonds with 2 hydrogen atoms to complete their octet state.

The structure is as below:

                       [tex]H_2[/tex]-C=C-[tex]H_2[/tex]

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Answer:

its a

Explanation:

trust

The value of Ka for acetylsalicylic acid will be calculated as Ka=(x+a)²/x.

Ka is known by the name of acid dissociation constant and for weak acid HA at equilibrium Ka will be calculated as:

Ka = [H⁺][A⁻] / [HA]

Chemical equation with ICE table for the acetylsalicylic acid will be shown as:

                  C₉H₈O₄(aq)  +  H₂O(l)  ⇄  C₉H₇O₄(aq)  +  H₃O⁺(aq)

Initial:                 x                                        0                     0

Change:            -a                                        +a                   +a

Equilibrium:      x-a                                      x+a                 x+a

So, Ka for acetylsalicylic acid will be calculated by putting values on the above equation as:

Ka = [x+a][x+a] / [x-a]

Value of a is negligible as compared to the value of x of acetylsalicylic acid so the term x-a becomes x and equation will be written as:

Ka = (x+a)² / x

By knowing the all values of concentration we can calculate the value of Ka.

Hence Ka value for acetylsalicylic acid will be calculated by using the formula as Ka = (x+a)² / x.

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Oils like petrol and diesel are fossil fuels. Using oil can be at a disadvantage as spilled oil can harm wildlife and the environment. Thus, option c is correct.

Oil is a nonrenewable fossil fuel that can get depleted when used in excess. It is extracted by many processes through mining underwater and in fields. During these extraction processes, oil spills can occur.

Oil spills directly affect the environment and cause pollution of water and soil. This leakage affects the flora and the fauna that lives in the area and causes their death due to lack of oxygen.

Therefore, option c. oil spills cause harm to wildlife.

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The number of mole present in 0.116 grams of barium sulphate, BaSO₄ is 0.0005 mole

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

Mole = mass / molar mass

From the question given above, the following data were obtained:

Mole = mass / molar mass

Mole of BaSO₄ = 0.116 / 233

Mole of BaSO₄ = 0.0005 mole

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