pyrite has a metallic luster. which sample is most likely pyrite?

What i would say: The amount of gravitational potential energy an object has depends on its height and mass. The heavier the object and the higher it is above the ground, the more gravitational potential energy it holds. Gravitational potential energy increases as weight and height increases.

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Answer:

24.64

Explanation:

Just took the test.

Answer:

ummm

Explanation:

im confused can you explain a little bit more

Answer: combustion reaction

[tex]C_{25}H_{52}+38O_2\rightarrow 25CO_2+26H_2O[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.

The balanced chemical equation is:

[tex]C_{25}H_{52}+38O_2\rightarrow 25CO_2+26H_2O[/tex]

The given reaction is a combustion reaction as in a combustion reaction , a susstaance is oxidized in the presence of oxygen to give carbon dioxide and water.

Answer:

A) 2

B) 1

C) 3

D) 4

i hope its right

Answer:

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Answer:

D

Explanation:

i took the test

A reaction which is exothermic and results in an increase in the entropy of the system is said to be always spontaneous. A spontaneous reaction is one that produces heat. The correct option is D.

A process which has an urge or a natural tendency to occur under a given set of conditions is defined as the spontaneous process. Some of the spontaneous process need no initiation, they take by themselves. Dissolution of common salt in water, evaporation, etc. are examples.

Almost all spontaneous process are found to be exothermic. They release heat and warm up their surroundings. These reactions move towards the equilibrium with no need for an energy input from an external source.

Gibbs free energy is an important parameter to determine the spontaneity of a reaction. If the value of ΔG is negative, then the reaction will be spontaneous.

Thus the correct option is D.

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Answer:

The key to understanding water's chemical behavior is its molecular structure. A water molecule consists of two hydrogen atoms bonded to an oxygen atom, and its overall structure is bent. This is because the oxygen atom, in addition to forming bonds with the hydrogen atoms, also carries two pairs of unshared electrons

Explanation:

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Answer:

C) The volume stays the same, but the shape changes to fit the new container.

Explanation:

Answer: The molarity of the solution is 0.125 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in L

moles of [tex]NaCl[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{14.6g}{58.5g/mol}=0.250mol[/tex]

Now put all the given values in the formula of molality, we get

[tex]Molarity=\frac{0.250mol}{2.00L}=0.125M[/tex]

Therefore, the molarity of the solution is 0.125 M

Answer:

2N

Explanation:

since they are going both sides you subtract

Answer:

Carbon dioxide is added to the atmosphere by human activities. When hydrocarbon fuels (i.e. wood, coal, natural gas, gasoline, and oil) are burned, carbon dioxide is released. During combustion or burning, carbon from fossil fuels combine with oxygen in the air to form carbon dioxide and water vapor.Carbon moves from fossil fuels to the atmosphere when fuels are burned. When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas. Each year, five and a half billion tons of carbon is released by burning fossil fuels.Carbon dioxide causes about 20 percent of Earth's greenhouse effect; water vapor accounts for about 50 percent; and clouds account for 25 percent.Likewise, when carbon dioxide concentrations rise, air temperatures go up, and more water vapor evaporates into the atmosphere—which then amplifies greenhouse heating

Answer:

the three parts are protons, neutrons, and electrons

Explanation:

have a good day

Answer:

Carbon dioxide is a greenhouse gas: a gas that absorbs heat. Warmed by sunlight, Earth’s land and ocean surfaces continuously radiate thermal infrared energy (heat). Unlike oxygen or nitrogen (which make up most of our atmosphere), greenhouse gases absorb that heat and release it gradually over time, like bricks in a fireplace after the fire goes out. Without this natural greenhouse effect, Earth’s average annual temperature would be below freezing instead of close to 60°F. But increases in g...

Explanation:

Answer:

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Answer:

1) KI

2) Mg3P2

3) Ag2S

4) FeBr3

5) Mg(OH)2

6) Na2SO4

7) Pb(NO3)4

8) (NH4)2CO3

Answer:

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Answer:

D.) The liquid or gas must circulate to move the heat

Explanation:

Answer:

mineral

Explanation:

Answer:

A theory

Explanation:

Answer:

4.21 moles are the moles of the gas when the volume decreases

Explanation:

Based on Avogadro's law, the moles of a gas are proportional to its volume under pressure and temperature constants. The formula is:

[tex]\frac{V_1}{n_1} =\frac{V_2}{n_2}[/tex]

Where V₁ is initial volume (230L)

n₁ is initial moles (5.50mol)

V₂ is final pressure (176L)

And n₂ are final moles:

176L * 5.50mol / 230L = n₂ =

Answer:

0.1041 M

Explanation:

The reaction that takes place is:

First we calculate how many moles of oxalic acid reacted, using the given molarity and concentration:

Then we convert H₂C₂O₄ moles to NaOH moles, using the stoichiometric coefficients:

Finally we calculate the molarity of the NaOH solution:

The order in which the substances will reach 90.0°C is; Ag, Zn, Fe, Al.

The term specific heat capacity refers to the quantity of heat that is required to raise the temperature of an object by 1K. The higher the heat capacity, the greater the heat that is required for the object to reach 90.0°C.

The order in which the substances will reach 90.0°C is; Ag, Zn, Fe, Al. We can see that Ag has the lowest heat capacity and the first to reach 90° while All has the highest heat capacity and the last to reach 90°.

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Answer:

c)

more hydronium ions than chloride ions

Answer:

freezing,

deposition

evaporation