Question 3
Which of the following is true of solar energy?

1. A technique for generating electricity using solar energy has not been developed.

2. The Sun's rays strike the Earth continuously; therefore storing electricity generated by solar cells is not necessary.

3. Producing electricity using solar cells is expensive.

4. The quantity of solar energy available to produce electricity is not affected by location on Earth's surface.

Answer:

Final temperature, T2 = 381.28°C

Explanation:

Given the following data;

Mass = 6.23 g

Initial temperature = 30.4°C

Heat capacity = 282 J

Specific heat capacity = 0.129 J/g°C

To find the final temperature;

Heat capacity is given by the formula;

[tex] Q = mcdt[/tex]

Where;

Q represents the heat capacity or quantity of heat.

m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

Making dt the subject of formula, we have;

[tex] dt = \frac {Q}{mc} [/tex]

Substituting into the equation, we have;

[tex] dt = \frac {282}{6.23*0.129} [/tex]

[tex] dt = \frac {282}{0.8037} [/tex]

dt = 350.88°C

Now, the final temperature T2 is;

But, dt = T2 - T1

T2 = dt + T1

T2 = 350.88 + 30.4

Final temperature, T2 = 381.28°C

Answer:

.0016

Explanation:

For specific heat problems you use the formula :

Q = mcΔT

They've given you the m, c and delta T, so you can plug in those values. (for the temperature change subtract 10 from 40 to see that it grew 30 degrees)

You're looking for Q so leave that variable in the equation. Then solve.

.Q = (8.00)(.384)(30)

Q = 92.16

92.16 J energy will be absorbed by a copper sample.

Given:

Specific heat  capacity, C= 0.384 J/g °C

Temperature, T₁ = 10.0°C and T₂= 40.0°C

Mass, m=8.00 g

We know that,

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (g) of the material when its temperature increases or 1 °C, and its unit is J/g °C.

Heat energy in terms of specific heat energy can be calculated by using this formula:

Q= m. C. ΔT

∵ΔT= change in temperature,

ΔT=40.0-10.0°C=30°C

Now substituting the values in the above formula.

[tex]Q= 8.0*0.384*30=92.16J[/tex]

Hence, 92.16 J energy will be absorbed by a copper sample.

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Answer:

19.3

Explanation:

V=4^3 a^3,  to find volume with sides

p= 1235/64, Mass/ Volume= Density

Answer:  Mass is 2,37 kg

Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.

m = W/g = 23.2 N /  9.81 m/s²

Explanation:

(Gases and liquids )

is the answer

Gases and liquids are the states of matter that have the same volume when moved.

Hope it helps you

Answer:

O₂ is limiting reactant and 6.17g CO₂ can be produced

Explanation:

Based on the balanced reaction:

C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O

1 mole of C₈H₁₈ reacts with 25/2 moles O₂.

To solve this question we must convert the mass of each reactant to moles and, using the balanced reaction, we can find limiting reactant. With moles of limiting reactant we can find the moles of CO₂ and its mass as follows:

Moles C₈H₁₈ -Molar mass: 114.23g/mol-

2.28g * (1mol / 114.23g) = 0.0200 moles C₈H₁₈

Moles O₂ -Molar mass: 32g/mol-

7.00g * (1mol / 32g) = 0.219 moles O₂

For a complete reaction of 0.0200 moles C₈H₁₈ are needed:

0.0200 moles C₈H₁₈ * (25/2moles O₂ / 1mole C₈H₁₈) = 0.250 moles of O₂ are needed.

As there are just 0.219 moles, O₂ is limiting reactant.

Moles of CO₂ that can be produced:

0.219 moles O₂ * (8moles CO₂ / 25/2moles O₂) = 0.140 moles CO₂

The mass is -Molar mass CO₂: 44.01g/mol-:

0.140 moles CO₂ * (44.01g / mol) =

Answer:

ocean

Explanation:

aavssdbvsvasgvesvdbvsvdbvv

Answer:

oceans/lakes/ponds/rivers/creeks/seas

Explanation:

Answer:1.4 g/L

Explanation:

One mole of very substance at STP contains a  volume of 22.4 liters. Density can be found by dividing the mass by volume . The density of the gas with a molecular mass of 32 grams is 1.42 g/l.

Density of a substance is the measure of its mass per volume. It represents how much denser it is in a given volume. Density depends on the molecular weight, bond type, volume, temperature and pressure.

STP is defined as the condition of standard temperature and pressure. 293 K and 1 atm pressure are considered to be the standard conditions. At STP, the volume of one mole of every substances contains 22.41 liters.

It is given that the molecular weight of the gas is 32 g/mol. Thus its density in one mole can be calculate as follows:

Density = mass/ volume.

             = 32 g/ 22.4 L

             = 1.42 g/L.

Hence, the density of the gas at STP with molecular mass of 32 g is 1.42 g/L.

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Answer:

The volume of the gas is approximately 4.41 liters

Explanation:

The details of the data of the Neon gas are;

The number of moles of Neon gas present, n = 11.6 moles

The temperature of the sample of Neon gas, T = 120 K

The pressure of the sample of the Neon gas, P = 25.6 atm

By the ideal gas equation, we have;

P·V = n·R·T

Where;

R = The universal gal constant = 0.08205 L·atm·mol⁻¹·K⁻¹

Therefore, we get;

V = n·R·T/P

Which gives;

V = 11.6 moles × 0.08205 L·atm·mol⁻¹·K⁻¹ × 120 K/(25.9 atm) ≈ 4.4097915 L

The volume of the gas, V ≈ 4.41 L.

Answer:

discoveries that can change little aspects of our daily lives or finding cures for diseases that have hounded humanity, scientists have been hard at work trying to push us toward a brighter future.

Explanation:

thats what i got from my research :D

Answer:

C) The molecules become separated from each other.

Explanation:

Answer:

3.60

Explanation:

To calculate the pH of any solution, use the formula;

pH= -log[ concentration ] and for this case take pH= -log[H3O+]

= -log[2.5x10^-4]

therefore pH= 3.60

The idea of pH mainly applies in the determination of the nature of various solutions to the used in the chemical analysis. The correct pH must be determined in order to get accurate results. Ionic equillibria mostly involves the calculations involving pH which is normally obtained after determination of equilibrium concentrations.

The mass of  60 g of carbon -14 remains after 17100 years is 7.50 g. Thus, option a is correct.

The unstable isotopes of atoms undergo radioactive decay by the emission of charged particles. The radioactive decay is a first order reaction.

The rate constant k = 1/t ln (M0/Mt)

where, M0 and Mt be the initial mass and mass after t respectively.

Given the initial mass = 60 g

half life t1/2 = 5700 years.

decay constant  k =   0.693 / t1/2

= 0.693 / 5700 = 0.00012 yr⁻¹

Apply the values in the first order rate constant equation as follows:

0.00012 yr⁻¹ = 1/ (17100 yrs) ln (60/Mt)

  60/Mt = 7.996    

        Mt = 7.50 g.

Therefore, the mass of the mass of 60 g of carbon -14 remains after 17100 years would be 7.50 g.

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Answer:

47730 grams.

Explanation:

First we convert 1.752x10²⁶ formula units of Ca(NO₃)₂ into moles, using Avogadro's number:

Then we convert 290.88 moles of Ca(NO₃)₂ into grams, using the molar mass of Ca(NO₃)₂:

Answer:

- The chemical reaction is not balanced. There is two oxygens on the reactant's side while there's only one oxygen on the products side.

- I would not say it's following the law of conservation of mass as it's not a balanced equation.

- To balance this equation, you would need to add the coefficient of '2' to Magnesium (Mg) on the reactants side, and add the coefficient of '2' to the products side.  This would make it so that there's 2 Mg's and 2 O's on both the reactant's side and products side.

edit: I hope this helped you in some way. ^^

Answer:

C. 12.85

Explanation:

just did

Answer:

If you have genetic variation then a community is more likely to survive because the population is more likely to have individuals who are fine if there are environmental changes. Then natural selection will happen and the species will evolve to he adapted to the new environment. If everyone in a population has the same genetics, than one thing could take them all out.

Answer:

47.6°C is the change of temperature

Explanation:

To solve this question we must use the equation of specific heat of a material:

Q = m*ΔT*S

Where Q is heat applied = 90J

m is the mass of the substance = 15g gold

ΔT is change in temperature = Our incognite

S is specific heat of the material = 0.126J/g°C for gold

Replacing:

90J = 15g*ΔT*0.126J/g°C

90J/15g*0.126J/g°C = ΔT

ΔT = 47.6°C is the change of temperature

Answer:

20

Explanation:

not sure please correct me if im wrong

Answer:

20

Explanation:

Got it right on time 4 learning

Answer:

False

Explanation:

Cows and other livestock release methane, which is a gas like Carbon Dioxide, but not the same thing, even though it does contribute into Carbon Dioxide.

Answer: An element is a substance only containing atoms that have the same number of protons in the chemical nuclei

Explanation:

Answer:

an opposite reaction

Earth's gravity is still pulling down on the rocket. When a rocket burns propellants and pushes out exhaust, that creates an upward force called thrust. To launch, the rocket needs enough propellants so that the thrust pushing the rocket up is greater than the force of gravity pulling the rocket down.

Answer:

10.3 mol Ga(ClO₃)₃

Explanation:

Let's consider the following balanced thermochemical equation.

2 Ga(ClO₃)₃(s) ⇒ 2 GaCl₃(s) + 9 O₂(s)  ΔH = - 130.4 kJ

According to the balanced thermochemical equation, 130.4 kJ of heat are released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:

674 kJ × 2 mol Ga(ClO₃)₃/130.4 kJ = 10.3 mol Ga(ClO₃)₃

Thermochemical equations are chemically balanced equations that take into account both the energy change and the physical states of all reactants and products. Energy is a reactant in an endothermic process, whereas it is a product in an exothermic reaction. Here the moles of Ga(ClO₃)₃ is  10.3 mol.

Let's consider the following balanced thermochemical equation.

2Ga(ClO₃)₃(s) ⇒ 2GaCl₃(s) + 9O₂(s)  ΔH = - 130.4 kJ

According to the balanced thermochemical equation, 130.4 kJ of heat is released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:

674 kJ × 2 mol Ga(ClO₃)₃ / 130.4 kJ = 10.3 mol Ga(ClO₃)₃

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Answer:

B) a predator

Answer:

6KClO3 + 3H2SO4 → 2HClO4 + 4ClO2 + 3K2SO4 + 2H2O

Explanation:

It's a bit long because you will keep changing the coefficient to match both side.

Answer: a

Explanation:

Answer:

Assertion (A) is true

but reason (R) is false.

Explanation:

If we look at the assertion closely, it is true that a sublime substance changes from solid to gas without  passing through a liquid state. Naphthalene, camphor, iodine and ammonium  chloride are some common  examples of the substances  which undergo sublimation.

However, not all solids first pass through a liquid state before converting to gas. Sublime solids such as those listed above passes directly from solid to gas without passing through a liquid state.

Hence the assertion is true but reason is false.