Which of the following statements is true?
A. Energy can be created, but not destroyed.
B. Some machines are 100 percent efficient.
C. Atomic energy can't be converted into electricity.
D. When work is done, some energy is always "lost" as heat.

Answer:

1. 2

2. 2

3. 3

Explanation:

That's my answer

Answer:

B.

Thank goodness for all the help you can

Explanation:

Basta

The value of K changes, affected by temperature

Endothermic (ΔH = +): temperature rises ⇒ K increases

Exothermic (ΔH = -): temperature increases ⇒ K decreases

From the data in the problem, the value of K increases in proportion to the temperature, then the reaction is said to be endothermic (C)

Answer:

solid particles are tightly held.

liquid particles have perfectly inelastic collisions

gas move in constant random motion

vapour

The mass of sodium chloride (NaCl) produced from the reaction when 471 KJ of heat is released is 67.04 g

2Na + Cl₂ —> 2NaCl   ΔH = + 822 kJ

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g

SUMMARY

From the balanced equation above,

When 822 KJ of heat is released, 117 g of NaCl were produced.

From the balanced equation above,

When 822 KJ of heat is released, 117 g of NaCl were produced.

Therefore,

If 471 KJ of heat is released, then = (471 × 117) / 822 = 67.04 g of NaCl will be produced

Thus, 67.04 g of NaCl were obtained from the reaction

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Answer:

=> Fire is a rapid oxidation of any substance or material. It is a exothermic chemical process of combustion.

=> Flame is a visible, gaseous region of a fire.

Answer:

CH4+2O2→CO2+2H2O

Moles of oxygen=3232=1

Moles of carbon dioxide=4422=0.5

Moles of water=1818=1

1 mole of methane reacts with 2 moles of oxygen to give 1 mole of CO2 and 2 moles of water so 0.5 mole of methane will be required which is equal to 0.5×16=8g.

Explanation:

8g

25g/30.01g = 0.83 moles

0.83(2/2) = 0.83 moles

0.83*46.005 = 38.2 grams

Answer:

2No+O2 gives 2No2

2 moles of No gives 2 moles NO2

Moles of No= 1.20/30=0.04

Moles = 0.04 ✖ 46=1.8 moles

Answer:

Non Renewable would be correct option

Explanation:

Non Renewable resources are resources that cannot be replenished within a lifetime.

These resources cannot be replaced after once used.

Examples of Non Renewable resources are Coal , Petroleum & gas etc .

Answer:

5

Explanation:

1km = 1,000m

5km = 5,000m = 1 light

25/5 = 5

Answer:

6. 36.7%

Explanation:    7. 21.2%                                                                                                                                                    8. 48%

Answer:

43.40%

Explanation:

Answer:

H

Explanation:

Answer:

Some of the energy from the electrons is used to pump hydrogen ions across the membrane, creating an electrochemical gradient that drives the synthesis of many more molecules of ATP. In all three stages of cellular respiration combined, as many as 38 molecules of ATP are produced from just one molecule of glucose.

Explanation:

Answer:

(D) petroleum

Explanation:

because as we know that petroleum is obtain from the sea bed,within the remains of animals and plants which lived millions of year ago......

You didn't provide the answer choices so I'll give all that I know.

No color change occurs

No odor is produced

No gas is produced

No temperature change occurs(Stays at room temp)

No precipitation occurs

Answer:

the first would be an polar compound the second would be a ionic compound and the third would be nonpolar compound

Answer:

This is what it looks like! Mark brainliest if u think im right <3

Explanation:

Weathering and erosion on the Earth's surface break down volcanic rock becoming pebbles, sand, as well as mud, resulting in sedimentary rock.

Sedimentary rock, rock generated at or near the Earth's surface as a result of sediment deposition and lithification or precipitation into solution at typical surface temperatures.

Sedimentary rocks are among the most frequent on the Earth's surface, although they make up just a minuscule portion of the crust, which would be dominated by metamorphic and igneous rocks.

Weathering and erosion on the Earth's surface break down volcanic rock becoming pebbles, sand, as well as mud, resulting in sediment that collects in basins just on Earth's surface. The image for the formation of sedimentary rock is given below.

Therefore, weathering and erosion on the Earth's surface break down resulting in sedimentary rock.

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Strong Acid + Strong Base = Neutral Salt + H2O

Strong Acid + Weak Base = Acidic Salt + H2O

Weak Acid +Strong Base = Basic Salt + H2O

Answer:

Answer no. 2

Explanation:

Distillation is the process of separating consistent solids from a liquid mixture

Answer:

The partial pressure of an individual gas is equal to the total pressure multiplied by the mole fraction of that gas.

The freezing point is mathematically given as

ft=-12.5C

Question Parameters:

5.00 kg glycol, Ca(OH)2. [this is antifreeze] is added to your radiator. If your radiator contains 12.0 kg

The molar freezing point depression constant for water is 1.86 'C.kg/mole.

Generally the equation for the Freezing point  is mathematically given as

ft=k  f [tex]\frac{wB}{Mb}*1000/Wa[/tex]

Therefore

0-ft=1.89*5000.62*1/12

ft=-12.5C

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Taking into account the definition of molarity, the concentration of the solution is 0.855 [tex]\frac{moles}{liter}[/tex].

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

[tex]Molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, you have:

Replacing in the definition of molarity:

[tex]Molarity=\frac{1.71 moles}{2 L}[/tex]

Solving:

Molarity= 0.855 [tex]\frac{moles}{liter}[/tex]

Finally, the concentration of the solution is 0.855 [tex]\frac{moles}{liter}[/tex].

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Answer:

6116g

Explanation:

2SO2(g) + O2(g) + 2H2O(ℓ) −→ 2H2SO4(ℓ)

We want to find the mass in grams of SO2 that is needed to react with 1527 g of O2. First we must convert the grams of O2 to moles of O2 then to moles of SO2 and then to grams of SO2

So first lets find the molar mass of O2

The mass of oxygen according to a periodic table is 15.999

Using this the mass of O2 would be 15.999(2) = 31.988g

Next we need to identify the mole ratio of O2 to SO2

Looking at the equation for 1 mole of O2 there are two moles of SO2

Next we need to find the molar mass of SO2

Again the mass of oxygen is 15.999g and the mass of Sulfur is 32.066

So the mass of SO2 would be 15.999(2) + 32.066 = 64.064g

Now that we have found all the needed conversions :

We can now use dimensional analysis to calculate the answer.

Kindly check the attached image to see the table. ( sorry if its a bit blurry )
Explanation : The conversions are used to cancel out the units to get to the final unit which is gSO2.

Once the units are cancelled out except for the gSO2 we mutliply and divide based off of what the table says to do.
Here first we divide 1527 by 31.988. We than multiply by 2. Finally we multiply by 64.064 to get the final answer which is 6116gSO2

Balanced chemical reaction

[tex]\\ \rm{:}\dashrightarrow 3M+N_2\longrightarrow M_3N_2[/tex]

Why? Because high-pressure systems don't allow vapor to get high enough to "become clouds," therefore it will not rain. :)

~pinetree

The molar mass of M is 40.2 g/mol and the name of the element is Calcium.

35.3g of element M reacted with nitrogen to produce 43.5g of compound M3N2.

3M + N₂→ M₃N₂

Therefore,

let the molar mass of element = x

35.3 g of M = 43.5 g of  M₃N₂

3x g of M = 3x + 28

cross multiply

35.3(3x + 28) = 43.5(3x)

105.9x + 988.4 = 130.5x

988.4 = 130.5x - 105.9x

988.4  = 24.6x

x = 988.4 / 24.6

x = 40.1788617886

x = 40.2

Therefore, the molar mass of M is 40.2 g/mol and the name of the element is Calcium.

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Answer:

Oil

Explanation:

everything else is above the earth

Answer:

3-methylhexane

Explanation:

For naming alkane molecules follow the following steps

1) Find the longest continuous carbon chain and count the number of carbons

In this structure, it is from the bottom, then up, then to the right. Making a right angle. There is 6 carbons in this chain which means it's a hexane

2) Number the longest carbon chain so the constituents (parts not part of the carbon chain) are connected to the carbon with smallest number possible.

This gives the extra CH3 group connected to carbon 3

3) Put it all together

Methyl connected to carbon 3 + hexane

3-methylhexane