___ act as an energy source? (From work bank)

Answer:

0.08937835168818843

Explanation:

1 grams Oxygen is equal to 0.062502343837894 mole.

Answer:

B

Explanation:

the energy of two separate hydrogen atoms decreases as they approach each other, and the single electrons on each atom are shared to form a covalent bond.

Answer:

When magma cools, crystals form because the solution is super-saturated with respect to some minerals. If the magma cools quickly, the crystals do not have much time to form, so they are very small. If the magma cools slowly, then the crystals have enough time to grow and become large.

Explanation:

Answer:

Cloud formation: Insoluble dust particles can form cloud droplets that affect global and regional climate. Scientists have long recognized the importance of soluble particles, such as sea salt and sulfates, in creating the droplets that form clouds and lead to precipitation.

Since AlBr3 is the sole product, we can use its coefficient to determine its molar ratio with Al. Conveniently, that ratio is 2:2 or, simplified, 1:1, which means that the number of moles of AlBr3 produced is equivalent to the number of moles of aluminum consumed in the reaction.

We must determine the number of moles of AlBr3 produced; we are given the mass of AlBr3 produced, so we divide the mass by the molar mass of AlBr3:

(15.0 g)/(266.694 g/mol) = 0.05624 mol AlBr3

Since the molar ratio of AlBr3:Al is 1:1, that means 0.05624 moles of Al were reacted. Now, all that is left is to convert the number of moles of Al to grams. We multiply the number of moles by the molar mass of Al:

(0.05624 mol)(26.982 g/mol) = 1.52 grams Al.

So, if 15.0 grams of AlBr3 are produced in this reaction, 1.52 grams of Al are needed.

The spectator ions would be the ions that don't comprise the precipitate in this reaction. You have four ionic species here: Pb²⁺, NO₃⁻, H⁺, and SO₄²⁻. Since Pb²⁺ and SO₄²⁻ combine, as you are told, to form the precipitate, that leaves H⁺ and NO₃⁻ (or, in normal text, H+ and NO3-) to be the spectator ions.

Edit: NO3- might be interpreted ambiguously since it's not immediately clear that the NO3 is a polyatomic ion with a -1 charge and not an NO compound with a 3- charge, so it should be written as [NO3]- or (NO3)-.

The net ionic reaction shows the reaction without the spectator ions. In this case, that would be: Pb²⁺(aq) + SO₄²⁻(aq) → PbSO₄(s).

Answer:

surface area of a solid reactant.

concentration or pressure of a reactant.

temperature.

nature of the reactants.

presence/absence of a catalyst.

When a particle and its antiparticle collide they are converted to energy.

A colloid would be a mixture in which a component made up of insoluble particles that are scattered at a microscopic scale is suspended within another component.

In order to accomplish work and to produce heat as well as light, energy must be supplied to a body or even to a physical system. Energy would be the quantitative attribute that does this. Energy would be transformed in form but cannot be created and destroyed, according to the rule of conservation of energy.

Annihilation occurs when a particle collides including its anti-particle. The particle and its antiparticle's whole mass are transformed back into energy to produce two gamma-ray photons. You won't find antiparticles in everyday stuff since they typically barely last for a tiny amount of time until annihilation takes place.

Therefore, the correct answer will be option (c).

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Answer:

1260 mL

Explanation:

Use formula (P1V1)/T1 = (P2V2)/T2

convert C to K

120 +273 = 393 K

20 + 273 = 293 K

plug numbers in

((1160)(1020))/ 393 = ((V2)(700))/ 293

solve for V2

V2 = 1260.187 mL

Answer:

1. In the morning the molecules were moving away from each other with a smaller speed than when the truck was carrying the substance.

2. The reason is that the molecules contain less average kinetic energy, thus their average speed is lower.

Explanation:

Our model of the state (phases) of the substances describes the molecules of solids as not moving away from each other, they are relatively fixed with respect to each other, just vibrating; the molecules of liquids as free to slide pass each other, which permits they to flow, but not moving away from each other; and the the molecules of the gases as moving away from each other, which is the cause of them occupying the whole space of the container that holds them.

According to that, the substance that the truck was carryng was a gas, because the molecules were moving away from each other.

After parking overnight, where energy transferred out of the substance, in the morning, the substance was a gas. Hence, the molecules were moving away from each other too. This answer the first question.

Since energy was transferred out of the substance, in the morning the temperature of the substance decreased (but no enough to make it a liquid). The average kinetic energy of the gases depends only on the temperature. So, the average kinetic energy of the molecules in the morning was smaller than when the truck was carrying the substance. Since the kinetic energy is proportional to the square of the speed of the molecules, the smaller average kinetic energy means that the average speed of the molecules was smaller too. Hence, in the morning the molecules were moving away from each other with a lower speed than when the truck was carrying the substance.

Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, molecules will move at a lesser speed as average kinetic energy will become small.

It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.

Mathematically, the formula for kinetic energy can be given as

K.E=1/2mv²

Where,

m= mass of object

v= velocity of object

Molecules will move at a lesser speed as average kinetic energy will become small.

Therefore, molecules will move at a lesser speed as average kinetic energy will become small.

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Answer:

sour

Explanation:

Sour is a characteristic property of all acids in aqueous solution.

Answer:

neutrons is metal.......

Answer:

salt

Explanation:

because it has a much larger volume ratio

Answer:

Sodium chloride is added to the ice to lower the freezing point of the ice. Large crystals dissolve more slowly than small crystals. This allows time for the ice cream to freeze more evenly.

Explanation:

Answer:

Thermo means heat/related to heat and haline means salty/of salt

Answer:

Explanation:

Rubidium was discovered by the German chemists Robert Bunsen and Gustav Kirchhoff in 1861 while analyzing samples of the mineral lepidolite with a device called a spectroscope. The sample produced a set of deep red spectral lines they had never seen before. Bunsen was eventually able to isolate samples of rubidium metal. Today, most rubidium is obtained as a byproduct of refining lithium.

Answer:

[tex]\boxed {\boxed {\sf B. \ -8.9 \ m/s^2}}[/tex]

Explanation:

Acceleration is found by dividing the change in velocity by the change in time.

[tex]a=\frac {v_f-v_i}{t}[/tex]

The parachute slows from 85 m/s to 45 m/s. Therefore, the final velocity is 45 meters per second and the initial velocity is 85 meters per second. The time is 4.5 seconds.

[tex]v_f= 45 \ m/s \\v_i= 85 \ m/s \\t= 4.5 \ s[/tex]

Substitute the values into the formula.

[tex]a= \frac {45 \ m/s- 85 \ m/s}{4.5 \ s}[/tex]

Solve the numerator and subtract.

[tex]a= \frac {-40 \ m/s}{4.5 \ s}[/tex]

Divide.

[tex]a=-8.888888889 \ m/s/s[/tex]

If we round this to the nearest tenth, the 8 in the hundredth place tells us to round the 8 up to a 9.

[tex]a \approx -8.9 \ m/s/s= -8.9 \ m/s^2[/tex]

The acceleration of the parachute is approximately -8.9 meters per square second. The value is negative because the parachute is slowing down.

Answer:

are you sure it is 95%?????

Explanation:

Answer:

A molecule is a group of two or more atoms held together by chemical bonds. A compound is a substance which is formed by two or more different types of elements which are united chemically in a fixed proportion. All molecules are not compounds. All compounds are molecules.

Explanation:

Answer:

True

Explanation:

Because density of water decreases as volume increases as mass increases too.

Hence greater loads can be carried.

Answer:

Pressure will double

Explanation:

Gay - Lussac Law => P ∝ T with volume and mass held constant.

=> P₁/T₁ = P₂/T₂ => P₂ = P₁T₂/T₁

T₂ = 2T₁

P₂ = P₁(2T₁)/T₁ = 2P₁

Double absolute temperature => double pressure

Answer:

D) Cool air is warming quickly.

Explanation:

d is the answer.

The arrows at point 3 indicates that Warm air is cooling quickly and the correct option is option C.

Sea breeze is a  blowing breeze from sea towards land during the day is called sea breeze.

During the day, the land surface heats up faster than the water surface.

Therefore, the air above the land is warmer than the air above the ocean.

As a result, warm air rises. Therefore, the warmer air over the land surface is rising.

As the warm air over the land is rising, the cooler air over the ocean is flowing over the land surface to replace the rising warm air

Therefore, The arrows at point 3 indicates that Warm air is cooling quickly and the correct option is option C.

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Answer:

223 g KCl

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

[RxN - Balanced] Cl₂ + 2KBr → Br₂ + 2KCl

[Given] 356 gg KBr

[Solve] g KCl

Step 2: Identify Conversions

[RxN] 2 mol KBr → 2 mol KCl

[PT] Molar Mass of K - 39.10 g/mol

[PT] Molar Mass of Br - 79.90 g/mol

[PT] Molar Mass of Cl - 35.45 g/mol

Molar Mass of KBr - 39.10 + 79.90 = 119 g/mol

Molar Mass of KCl - 39.10 + 35.45 = 74.55 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

223.024 g KCl ≈ 223 g KCl

Answer: NH3 has a higher solubility rate than SbH3 because it has much stronger bonds. ... HoCH2CH2OH because it can form two bonds with water compared to the other molecule which can only form one.

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By combining the stoichiometry through the subscript provided for each element, the atoms may be counted.

Atom, the smallest unit of matter that may be separated without releasing electrically charged particles. It is also the lowest unit of matter with the characteristics of a chemical substance. As a result, the atom is indeed the fundamental building component of chemistry.

The majority of the atom comprises empty space. The rest of the structure is made up of a positive-charged nucleus of neutrons and proton surrounding by such a cloud of negative-charged electrons.

H[tex]_2[/tex]O     2 Hydrogen atom              1 oxygen atom

O[tex]_2[/tex]        2 oxygen atom

NaCl     1 sodium atom       1 chlorine atom

Therefore, by combining the stoichiometry through the subscript provided for each element, the atoms may be counted.

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Answer:

0.0736 M or 10.4 g/L

Explanation:

First we convert 4.550 g of Na₂SO₄ into moles, using the molar mass of Na₂SO₄:

Then we calculate the final volume of the solution:

Now we can proceed to calculate the concentration -in molarity- of the solution:

In g/L the concentration would be: