Select the correct answer. the compound diborane can be used as a rocket propellant. what is the percent composition of boron in diborane (b2h6)? a. 22% b. 25% c. 39% d. 75% e. 78%

Answer:Methane(CH4) and dioxygen(O2) are the reactants

Carbon dioxide(CO2) and water(H2O) are the products

Explanation:

The compounds with high Intermolecular forces , will result in the highest melting point.

The temperature at which the solid and liquid form of a solvent are in equilibrium and applying any more heat will lead to melting of the solid into liquid is called Melting Point.

The Intermolecular force that would result in highest melting point is the Ion-Ion interaction , the more the bonding the higher will be the melting point.

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The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)

Significant figures can be defined as numbers in a group of numbers that place number in the right value or worth.

Significant figures defined the value of measurement of  a particular number.

The rules of engagement in this case is the set of rules or laid down principles that direct how we interact with this significant figures and how they are used.

For this case the significant figures of the product will be the same as the figure with the least significant figure in the multiplication.

In conclusion, The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)

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The darkening of the atmosphere caused by meteorites would have reduced the sizes of some ecosystems due to less solar energy being available to plants.

This is the form of energy which is derived from the sun and is usually trapped by plants during photosynthesis.

Plants being primary producers will have less photosynthetic activity thereby leading to less food production and oxygen availability.

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The volume of water that will be produced from the reaction will be 6.3 mL

From the equation of the reaction:

[tex]H_2SO_4 + 2NaOH --- > Na_2SO_4 + 2H_2O[/tex]

The mole ratio of hydrogen sulfate to sodium hydroxide is 1:2.

Mole of hydrogen sulfate = 0.50 x 350/1000 = 0.175 moles

Mole of 15 grams sodium hydroxide = 15/40 = 0.375 moles

Thus, hydrogen sulfide is the limiting reagent.

Mole ratio of hydrogen sulfide to water = 1:2.

Equivalent mole of water = 0.175 x 2 = 0.35 moles

Mass of 0.35 moles of water = 0.35 x 18 = 6.3 grams.

1 gram of water = 1 ml.

Thus, 6.3 grams of water will be equivalent to 6.3 mL

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Answer:

Ionic compounds do not exist in independent molecular form

-Lexi

Answer:

D.

Explanation:

This is because this option would allow one to see the sorroundings of the new building. The others only give perpectives on what the new building looks like, isolated from its sorroundings.

Answer:

There are 72grams in 4 moles of H20

Answer:

B

Explanation:

i just know

Answer:

B

Explanation:

Hydrocarbons are with hydrogen and carbon only, so therefore you can immediately eliminate C and D. Therefore, we are left with A and B. Unsaturated hydrocarbons have double bonds or more, so B would be our answer (Double bond between carbon 1 and 2)

Answer:

Molecular solids and covalent network solids are two types of solid compounds. The key difference between molecular solid and covalent network solid is that molecular solid forms due to the action of Van der Waal forces where as covalent network solid forms due to the action of covalent chemical bonds.

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Answer:

Heat going into a substance changes it from a solid to a liquid or a liquid to a gas. Removing heat from a substance changes a gas to a liquid or a liquid to a solid.

Liquid → Gas: 

VaporizationGas → Liquid:

 CondensationSolid → Liquid:

 Melting or fusion

Solid → Gas: Sublimation

Explanation:

Answer:

ITS B

Explanation:

MY CONSCIOUS MIND IS TELLING ME

Answer:

14

Explanation:

sun normal persentage is 14

The biotic factors are bacteria soil, dead leaves, and stream water.

An abiotic factor is a non-living part of an ecosystem that shapes its environment.

Biotic and abiotic factors make up a community via interaction.

Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.

The dead leaves of plants are an abiotic factor, the bacteria in soil are living matter and stream flowing, etc.

Hence, the biotic factors are bacteria soil, dead leaves, and stream water.

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A person who eats three servings of the cereal without milk will consume about 117 percent of calories.

This is defined as  a unit of energy and is commonly used in the body system.

One serving of cereal without milk will contain 39 percent of calories while three servings will be 117 percent.

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Answer:

660J/kg.°C

Explanation:

Using the fact that

∆E of metal + ∆E of water = 0

∆E of the metal = Q = m*c*(T2-T1)

Where

Q = heat lost or gained = ?

m = mass of metal in kg = 0.076kg

c = specific heat of the metal = ?

T1 = 96°C

T2=31°C

∆E of the water=Q= m*c*(T2-T1)

Where

Q = 0.120*4180*6.5 = 3260J

Therefore

3,260J + Q of the metal =0

3,260J + 0.076*C*(31.0–96.0)=0

3,260J - 4.94c = 0

3,260 = 4.94c

3,260/4.94 = c

660J/kg.°C = specific heat of the metal

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Answer:

Antacids are medicines that counteract (neutralise) the acid in your stomach to relieve indigestion and heartburn. They come as a liquid or chewable tablets and can be bought from pharmacies and shops without a prescription.

⇒Answer:

acid + alkali → salt + water

⇒Explanation:

The acid and alkali neutralize each other to create salt and water. Different acids produce different salts.

Sulphuric acid creates Sulphate salts.

Nitric acid creates Nitrate salts.

Hydrochloric acid creates Chloride salts.

The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.

A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.

In a neutralization reaction, there is a combination of H⁺ ions and OH⁻ ions which form water.

Therefore, The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.

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Ionization energy is the periodic property of an element. The copper atom has the highest ionization energy among gold and silver atom.

Ionization energy is the amount of energy required for the removal of the loosely bounded electron from an atom. The ionization energy can be first, second, and third based on the number of electrons.

Ionization energy down the group decreases from top to bottom as the atomic radii of the element increase. So, the ionization energy for the given elements is Cu > Au > Ag.

Therefore, copper has the highest ionization energy.

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Answer:

Y E S

Explanation:

Hibiscus tea has plenty of skin care qualities, from helping your natural levels of collagen and elastin to reducing breakouts to balancing oil production. Hibiscus is known for its rich level of antioxidants, including vitamin C and beta-carotene.

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Answer:

go with the fourth one because I did that one

The amount of oxygen in grams that reacted with 5.6 g of hydrogen to produce 41.4 g of water is 36.8 g

2H₂ + O₂ —> 2H₂O

Molar mass of O₂ = 32 g/mole

Mass of O₂ from the balanced equation = 1 × 32 = 32 g

Molar mass of H₂O = 18 g/mole

Mass of H₂O from the balanced equation = 2 × 18 = 36 g

SUMMARY

From the balanced equation above,

36 g of H₂O was produced from 32 g of O₂

NOTE: O₂ is the limiting reactant

From the balanced equation above,

36 g of H₂O was produced from 32 g of O₂

Therefore,

41.4 g of H₂O will be produced from = (41.4 × 32) / 36 = 36.8 g of O₂

Thus, 36.8 g of O₂ reacted to produce 41.4 g of H₂O

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The volume of CO2 prodiced when 12 mL of CH4 and 8 mL of C4H10 is burnt is 56 mL.

The equation of the combustion of C2H6, CH4, C4H10, and C3H8 gases are given below:

2 C2H6 + 7 O2 ---> 4 CO2 + 6 H20

C3H8 + 5 O2 ---> 3 CO2 + 4 H20

CH4 + 2 O2 ----> CO2 + 2 H2O

2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O

X moles of C2H6 will produce 2X moles of CO2

Y moles of C3H8 will produce 3Y moles of CO2

Thus;

X + Y = 20 mL

X =20 - Y ---(1)

2X + 3Y = 52 mL ---(2)

Solving for X by substituting in (2)

2 (20 - Y) + 3Y = 52

40 - 2Y + 3Y = 52

Y = 12 mL

Then X = 8 mL

Volume of CO2 produced when 12 mL of CH4 and 8 mL of C4H10 is burnt = (12 × 2 + 8 × 4) = 56 mL

Therefore, the volume of CO2 produced is 56 mL.

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The molecular formula CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

Organic compounds are compounds that are obtained from organic materials.

The most common organic compound are the hydrocarbons,

The hydrocarbons includes the alkanes, alkenes, alkynes, etc.

The given compound CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

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The minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.

The term excitation has to do with the promotion of an electron from a lower to a higher energy level.

In this case, we are dealing with the hydrogen atom having only one electron. Thus, the minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.

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Answer:

0.5 M

Explanation:

molarity = (moles of solute)/(liters of solution)

molarity = 2.00/4 = 0.5 M

The new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

Endothermic reactions, in general, are those that absorb (or use) energy. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products.

Normally, when a chemical bond is broken, energy is released in the process. The chemical bond formation also demands an energy input.

The energy that is supplied/released can come in varieties (such as heat, light, and electricity). The formation of chemical bonds following the absorption of heat from the environment characterizes endothermic processes.

When two chemicals react in an endothermic reaction the new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.

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Answer: 339.84 K

Explanation:

[tex]$$We are given: \\$\mathrm{n}=0.46$ moles \\$V=13.3 \mathrm{~L}$\\$\mathrm{P}=734 \mathrm{~mm} \mathrm{Hg}=0.965 \mathrm{~atm}$\\Putting these values in ideal gas equation we get:\\$0.965$ batm * $13.3 \mathrm{~L}=0.46 \mathrm{~mol} * 0.0821 \frac{\mathrm{atmL}}{\mathrm{molK}} * \mathrm{~T}$\\$\mathrm{T}=\frac{0.965 * 13.3}{0.46 * 0.0821} \mathrm{~K}$$$\mathrm{T}=339.84 \mathrm{~K}$$[/tex]

Answer:

C

Explanation:

just did it