Please answer all questions on sheet

Answer:

D.) All of the above

is the correct answer

By a growing human population, amount of land for farming, amount of air pollution and clean water is likely to be affected.

Population tells about the relative numbers of people present in particular area.

When there is a increase in the population of people then there is decrease in the amount of land for farming because more people want more land and this results in lack of land for individual. The affect of increased population results in the increase of air pollution, noise pollution, land pollution as well as water pollution.

Hence, option (d) is correct i.e. all of the above.

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It is a base because its pH is greater than 7

(not sure about the second sorry!)

Answer:

Solar energy can be mined with less damage to ecosystems

Explanation:

solar energy isint mined, its collected and it is kinda bad for the environment when you mine the metals to get the solar panel

Answer:

D

Explanation:

Answer:

3 Hz

Explanation:

frequency = [tex]\frac{number of waves}{time}[/tex]

thus [tex]f=\frac{6}{2}[/tex] = 3 Hz

If there are 6 waves in a 2-second time frame, the frequency is 3 Hz. When a wave travels through a medium, the frequency describes how frequently the medium's particles vibrate.

The frequency identifies the frequency at which the particles of the medium vibrate as a wave passes through it.

Frequency = number of waves ÷time

The number of waves is  6 and time is 2 second

     f = 6 ÷ 2

      =  3

A disturbance or variation that causes energy to be transferred gradually from one point to another in a medium. It can be an elastic deformation or a change in pressure, electric potential, electric or magnetic intensity, or temperature.

Therefore, if there are 6 waves in a 2-second time frame, the frequency is 3 Hz.

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Answer:

Oxidation - reduction reaction which is called redox reaction.

Explanation:

The type of reaction that is a part of another type but treated separately is called Oxidation - reduction reaction.

Thus is because they usually involve 2 separate half reactions which are oxidation reactions that involve loss of electrons and then reduction equations which involve gain of electrons.

They are treated separately for example when sodium reacts with chlorine to form sodium chloride.

2Na + Cl2 = 2NaCl

Now, sodium undergoes oxidation by loosing elctrons and it's half reaction is;

2Na → 2Na​^(+) + 2e^(-)

​​Meanwhile chlorine undergoes reduction by gaining electrons and its half reaction is;

Cl2 + 2e^(-) → 2Cl^(-)

Answer:

2

Explanation:

1. Take 2-3 crystals of potassium permanganate and dissolve them in 100 mL of water.

2. Take out approximately 10 mL of this solution and put it into 90 mL of clear water.

3. Take out 10 mL of this solution and put it into another 90 mL of clear water.

4. Keep diluting the solution like this 5 to 8 times.

5. Is the water still coloured?

Answer:

The dam disrupts the river wildlife and ecosystem.

Explanation:

Though it is believed that using the dam as a power generation or hydroelectric power supply generates no greenhouse gases, it, however, has many disadvantages which make it deemed not suitable or sustainable for use in the contemporary time.

Majorly, the top reason why more hydroelectric dams are not built is that "the dam disrupts the river wildlife and ecosystem."

Also, it affects the water quality and other use of water for humans such as recreational use.

There is also a possible chance of dams producing methane; a greenhouse gas through the organic materials in the water that is rotting.

Answer:

No you cannot balance an Egg on Spring Equinox without practice and the right egg

Explanation:

No you cannot balance an Egg on the spring Equinox and this is because it is just a Myth, according to Dr Harry E. Keller,

Balancing of an egg ( making an egg stand upright ) takes practice, Getting the right egg ( i.e. an egg with its yolk placed at the center of the egg ) and can be done anytime of the day and not just on spring equinox

Answer:

See explanation

Explanation:

The most important thing to bear in mind when writing chemical reaction equation is that the equation must be balanced. A balanced chemical reaction equation is one in which the number of atoms of each element on the left and right hand sides of the reaction equation is exactly the same.

Equation of magnesium reaction with oxygen

2Mg(s) + O2(g) ------> 2MgO(s)

Equation of magnesium reaction with nitrogen

3Mg(s) + N2(g) ------> Mg3N2(s)

Answer:

8.8

Explanation:

You can view more details on each measurement unit: molecular weight of Aluminum or grams The molecular formula for Aluminum is Al. The SI base unit for the amount of substance is the mole. 1 mole is equal to 1 mole of Aluminum.

Answer:

I think it's metabolism

Hope this helps

Answer: 55.345L

Explanation:

PV=nRT

PV=4R(333)

200V=4(8.31)333

200V=11069

V=11069/200

V=55.345L

Answer:

Activation energy is called the energy required to initiate a chemical reaction.

Explanation:

A. If motion starts and stops at the same location, then the displacment is zero.

D. Distance is always greater than or equal to the magnitutde of the displacement.

Answer:

10.1 L

Explanation:

At STP (meaning T = 273 K and P = 1 atm) one mol of any given gas will occupy 22.4 liters.

With the above information in mind, we can calculate how many liters will 0.45 moles of water vapor occupy:

Meaning that if 0.45 moles of water are produced at STP, 10.1 liters of water would be produced.

Answer:

The sun, like all stars, is able to create energy because it is essentially a massive fusion reaction. Technically known as nuclear fusion, this process releases an incredible amount of energy in the form of light and heat.

Types of energy produced: Stars produce energy from nuclear reactions, primarily the fusion of hydrogen to form helium.

Explanation:

hope this helped :D

Answer:

204

Explanation:

Answer:

Explanation:

At constant pressure, the heat of reaction is equal to the enthalpy change of the system. Most chemical reactions occur at constant pressure, so enthalpy is more often used to measure heats of reaction than internal energy

For a chemical reaction, the heat of reaction, also known as enthalpy change (∆H), is equal to the difference between the total energy of the products and the total energy of the reactants.

Enthalpy change represents the amount of heat energy exchanged or released during the course of a reaction. The heat of reaction can be positive (endothermic), indicating that the reaction absorbs heat from the surroundings, or negative (exothermic), indicating that the reaction releases heat to the surroundings.

The magnitude of the heat of reaction is a measure of the amount of heat energy involved in the reaction.

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Answer:

co2 = 44,01 g/mol

85\44= 1,93 mol

Explanation:

To solve this we must have a claeas concept behind Farsightedness and nearsightedness. Therefore, distant objects are blurry,  describes farsightedness. The correct option is option A.

Farsightedness (hyperopia) is a common visual issue in which you can clearly see far things but have fuzzy vision of nearer items. Your capacity to focus is affected by your degree of farsightedness.

Farsightedness is most usually caused by an eyeball that is too short or by a cornea (the transparent layer at the front of the eye) that is not curved enough. Light cannot focus directly on the retina due to these two issues. Light instead concentrates behind the retina, making close-up objects appear fuzzy.

Therefore, distant objects are blurry,  describes farsightedness. The correct option is option A.

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Answer:5 1/2. occurred the other day i think

Explanation:

Answer:

B. Their populations will decrease, and the carrying capacity will increase.

Explanation:

Answer:

P = 13.5 atm

Explanation:

Given that

No. of moles, n = 20 moles

Volume of nitrogen gas = 36.2 L

Temperature = 25°C = 298 K

We need to find the pressure of the gas. Using the ideal gas equation

PV = nRT

Where

R is gas constant, [tex]R=0.082057\ L-atm/K-mol[/tex]

So,

[tex]P=\dfrac{nRT}{V}\\\\P=\dfrac{20\times 0.082057\times 298}{36.2 }\\\\P=13.5\ atm[/tex]

so, the pressure of the gas is equal to 13.5 atm.

Answer:

2H2S (g) + 3O2 (g) → 2H2O (l) + 2SO2 (g)

Calculate ΔH° from the given data. Is the reaction exothermic or endothermic?

ΔH°f (H2S) = -20.15 kJ/mol; ΔH°f (O2) = 0 kJ/, mol; ΔH°f (H2O) = -285.8 kJ/mol; ΔH°f (SO2) = -296.4 kJ/mol

Answer:

CaC2O4

Explanation:

Answer:

combustible.

Explanation:

The substances which burn in air are called combustible. Oxygen (in air) is essential for combustion. During the process of combustion, heat and light are given out.

Hope this helped!!!

Answer: flammable

Explanation:

Answer:  mixed

compound

Explanation:

Answer:

summer

The North Pole stays in full sunlight all day long throughout the entire summer (unless there are clouds)

Answer:

summer

Explanation:

hope this helps :)

Answer:

B

Explanation:

B

have cells with a cell wall and are heterotrophic