Mass box A = 10 grams; Mass box B = 5 grams; Mass box C-made of one A and one B
How many boxes of B would be required to make 30 grams of C?
hy

Answer:

The molecules (which do not ionize) dissolves in water depends on the polarity of molecules while the ionic compounds that dissolve in water depend on the electric charge of the compound.

For example sugar dissolves in water because of the polar nature of sugar which releases energy and form intermolecular bonds with the polar water molecules.

While salt dissolves in water as salt has a net electric charge that attracted by the oppositely charged ions present in the water. The attractive force between salt and water is stronger than sodium and chloride and allow salt to dissolve in the water.

Answer:and so an acid should be applied to neutralize them and remove the pain.

Explanation:Bee and Wasp stings can be both painful and itchy, and are very common ... Many common household substances can be used for this, and vinegar and ... If you are near other Bees and Wasps,

Ammonia can be used to neutralise. Hence, option A is correct.

It is the simplest carboxylic acid which consists of a single carboxylic acid group (COOH) which is attached to a hydrogen atom.

Ammonia is a great way to help neutralise the venom of a bee sting. All you need to do is create a thick paste out of baking soda and water and apply it to the sting.

Hence, option A is correct.

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Answer:

D. An oxygen molecule (0)

Explanation:

Hope it helps.

Answer:O D to protect the environment from harmful chemicals

Explanation:

Answer:

26.33 g of NO.

Explanation:

We'll begin by writing the balanced equation to produce NO from H2O. This is given below:

5N2 + 6H2O —> 4NH3 + 6NO

Next, we shall determine the mass of H2O that reacted and the mass of NO produced from the balanced equation. This is illustrated below:

Molar mass of H2O = (2x1) + 16 = 18 g/mol

Mass of H2O from the balanced equation = 6 x 18 = 108 g

Molar mass of NO = 14 + 16 = 30 g/mol

Mass of NO from the balanced equation = 6 x 30 = 180 g

From the balanced equation above,

108 g of H2O reacted to produce 180 g of NO.

Finally, we shall determine the mass of NO produced by the reaction of 15.8 g of H2O.

This is illustrated below:

From the balanced equation above,

108 g of H2O reacted to produce 180 g of NO.

Therefore, 15.8 g of H2O will react to produce = (15.8 x 180)/108 = 26.33 g of NO.

Therefore, 26.33 g of NO were obtained from the reaction.

Answer:

The answer is

Atoms gain other atoms

Hope this helps you

Answer:

AAAAAAAAAAAA!!!!!!!

Explanation:

Answer:

D. Tetrahedral

Explanation:

the reason is because four electron pairs are distributed.

Answer: The answer would be B. contains many young stars.

Explanation:

There is very little new star formation in Irregular galaxies. Irregular galaxies have no particular shape and are smaller than other types of galaxies.

The irregular galaxy possess many young stars.

They are the most unusual of galaxies.

They do not fit into either the elliptical or spiral galaxy categories.

They do not possess nice spiral arm, however, they do possess dark patches of dust and gas.

The irregular galaxies do not possess definite shape.

They comprise of several young stars as the extent of the formation of stars in irregular galaxies in brisk. They also do comprise old stars.

Thus, the correct statement is contains many young stars.

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Scientific evidence for warming of the climate system is unequivocal.

The current warming trend is of particular significance because most of it is extremely likely (greater than 95 percent probability) to be the result of human activity since the mid-20th century and proceeding at a rate that is unprecedented over decades to millennia.

Earth-orbiting satellites and other technological advances have enabled scientists to see the big picture, collecting many different types of information about our planet and its climate on a global scale. This body of data, collected over many years, reveals the signals of a changing climate.

The heat-trapping nature of carbon dioxide and other gases was demonstrated in the mid-19th century.Their ability to affect the transfer of infrared energy through the atmosphere is the scientific basis of many instruments flown by NASA. There is no question that increased levels of greenhouse gases must cause the Earth to warm in response.

Answer:

this is false

Explanation:

Answer : The mass of iron needed is 29.5 grams.

Explanation : Given,

Mass of [tex]O_2[/tex] = 12 g

Molar mass of [tex]O_2[/tex] = 32 g/mol

First we have to calculate the moles of [tex]O_2[/tex].

[tex]\text{Moles of }O_2=\frac{\text{Given mass }O_2}{\text{Molar mass }O_2}[/tex]

[tex]\text{Moles of }O_2=\frac{12g}{32g/mol}=0.375mol[/tex]

Now we have to calculate the moles of [tex]Fe[/tex]

The balanced chemical equation is:

[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]

From the reaction, we conclude that

As, 3 moles of [tex]O_2[/tex] react with 4 moles of [tex]Fe[/tex]

So, 0.375 mole of [tex]O_2[/tex] react with [tex]\frac{4}{3}\times 0.375=0.5[/tex] mole of [tex]Fe[/tex]

Now we have to calculate the mass of [tex]Fe[/tex]

[tex]\text{ Mass of }Fe=\text{ Moles of }Fe\times \text{ Molar mass of }Fe[/tex]

Molar mass of [tex]Fe[/tex] = 59 g/mole

[tex]\text{ Mass of }Fe=(0.5moles)\times (59g/mole)=29.5g[/tex]

Therefore, the mass of iron needed is 29.5 grams.

Answer:

365.212

Explanation:

According to the given situation, the calculation of molar mass is shown below:-

Data provided

[tex]c_{16}\ h_{19}\ n_3\ o_5\ S[/tex]

Molar mass = 16 × 12 + 19 × 1.008 + 3 × 14 + 5 × 16 + 32.06

= 192 + 19.152 + 42 + 80 + 32.06

Molar mass = 365.212

Therefore for determining the molar mass we simply solve the above equation.

So, the correct answer is 365.212

Answer: the speed at which products form

Explanation:

Rate of a reaction is defined as the speed at which a chemical reaction proceeds. It is often expressed in terms of the concentration of a reactant that is consumed in a unit time or the concentration of a product that is formed in a unit of time.

For a general reaction :[tex]A\rightarrow B[/tex]

[tex]Rate=-\frac{d[A]}{dt}[/tex]

or [tex]Rate=+\frac{d[B]}{dt}[/tex]

where d[A] = change in concentration of reactant A

d[B] = change in concentration of product B

dt = time interval

Answer:

A. 6.25moles

B. 0.78moles

C. 0.32moles

D. 0.15moles

E. 0.43moles

Explanation:

use

A. He

B. O2

C. Al(OH)3

D. GaS3

E. C4H10

According to the mole concept, there are  6.25 moles, 0.78 moles,0.32

moles, 0.15 moles, 0.43 moles.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons.Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.Number of moles=mass/molar mass

Thus, A. He,25/4 = 6.25 moles,B. O₂,25/32 = 0.78 moles,C. Al(OH)₃,25/78 = 0.32 moles,D. GaS₃,25/166 = 0.15 moles E. C₄H₁₀,25/58 = 0.43 moles.

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Answer:

The abundance of the 13C isotope is 1.115%

Explanation:

The given information are;

Common isotope of carbon are 12C and 13C

The formula for calculating the relative atomic mass is the observed mass multiplied by the percentage abundance at that mass given as follows;

M₁ X₁ + M₂X₂ = Relative atomic mass

Where:

X₁ + X₂ = 1 as these are percentage represented as fractions

Let M₁ = 12 for 12C and M₂ = 13 for 13C

X₁ = Relative abundance fraction of 12C

X₂ = Relative abundance fraction of 13C

We have;

12X₁ + 13X₂ = 12.01115.......................(1)

X₁ + X₂ = 1............................................(2)

Which gives;

X₁  = 1 - X₂

Substituting the value for X₁ in equation (1) gives;

12(1 - X₂) + 13X₂ = 12.01115

13X₂ - 12X₂ + 12 = 12.01115

X₂ = 12.01115 - 12 = 0.01115

Therefore, the relative abundance fraction of 13C 0.01115 which in percentage is 100 × 0.01115  = 1.115%.

One mole of any gas at room temperature and pressure will occupy 22.4 liter(s) (option C).

Ideal gas is an hypothetical gas, whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container.

One mole of an ideal gas contains a volume of 22.414 L at standard temperature and pressure (STP).

According to Avogadro's law, the volume occupied by one mole of a gas must be the same for all gases if the temperature and pressure are the same.

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Answer:

B) The magnetic pole near the South Pole is a north pole.

Explanation:

The north pole on the compass is the geographical South Pole.

Hope it helps.

Answer:

The answer is B.

Explanation:

Answer:

A

Explanation:

Protons are the ones which give rise to different elements, hence different elements have different chemical properties. Therefore, the two atoms must have different proton numbers.

The relative atomic mass of an atom is determined by the mass of the neutrons and the protons. The mass of the electrons are not included due to their negligible mass (1/1840).

Hence, due to the different proton masses, the masses of the neutrons will also differ to ensure that both atoms have the same relative atomic mass.

Answer:

B. Two electrons

Explanation:

Since the S orbital is closest to the nucleus and it only has one orbital, it can only hold 2 electrons

Answer:

To have a high electrical conductivity, a normal metal should have mobile valence electrons and a long electron mean free path.

Explanation:

A long mean free path means that the electron goes a long distance between scattering events.

The characteristic of metals which makes them good electrical conductors is that they have mobile valence electrons.

An element is the simplest form of matter.Elements are further classified as metal,non -metals and metalloids. Metals possess luster and are malleable that is they can be drawn into thin sheets.They are also ductile and can be drawn into thin wires and are hard due to the strong ionic bonding present in them.

They are good conductors of electricity and heat as they have valence electrons which are mobile  and can be easily be displaced if a current is allowed to pass through the metal, thus making it a good conductor.The conductivity of a metal is directly proportional to the number of valence electrons .

Higher the number of valence electrons, greater is the conductivity.Owing to the valence electrons,current can flow through the metal thus making it a good conductor.

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Answer:

Pulp and Paper technology is a specialist field of chemical engineering which involves the study of the processes required for the conversion of raw materials such as wood, into pulp and paper products.

Paper and pulp manufacturing is a growing and dynamic industry so it requires a wide variety of personnel - from unskilled and semi-skilled workers to tradesmen, technicians and engineers - to control all the processes and develop new ones.

I choose to be a chemist in the field of paper and pulp. Requirements and compulsory Subjects: Physical Sciences, Mathematics, Engiineering and Technology.

Chemists are responsible for quality control and they study the influence of various chemicals on pulp and paper. Chemical and mechanical engineers develop new production methods.

I'll like to be a chemist in the field of paper and pulp because they perform the major role in the chemical properties of the paper and pulp.

Explanation:

Hope it helps.

Answer:

PLATO ANSWER

Explanation:

Answer:

Hormones

Explanation:

Temperature, soil conditions, and  light are all external stimuli that the plants can respond to; therefore, hormones would be the only internal stimulus.

Answer:

3.36x10^27 atoms

Answer:

The traces of hydrogen ions are not discharged, so you not see any gas bubbles collecting on the negative cathode electrode. The blue colour fades as more and more copper is deposited, depleting the concentration of the blue copper ion Cu2+ ions in solution.

Explanation:

Answer:

0, 1, 2  

Explanation:

The rules for quantum numbers are:

n = 1, 2, 3, 4, …

l = 0, 1, 2, …, n - 1

mₗ = -l, -l + 1, …, 0, …, l - 1, l

If n = 3, l can go from 0 to 3 - 1 = 2.

The correct possible values of l are 0, 1, 2.

B is wrong because the maximum possible value of l is 2.

C and D are wrong because they contain negative numbers. They must be possible sets of magnetic quantum numbers, mₗ.

Answer:

A. 0,1,2

Explanation:

Answer:

a mole of lactic acid = 90 g

a 0.5 M solution would require 1/2 mol or 45 g

Explanation:

The molecular mass is 90 d, the combined atomic masses of its atoms.

There are 45 grams of lactic acid in 1 liter of a 0.5M solution of lactic acid

CALCULATE THE NUMBER OF MOLES IN THE SOLUTION:

no. of moles = molarity × volume

no. of moles = 1 × 0.5

no. of moles = 0.5moles of lactic acid

CALCULATE THE MASS OF LACTIC ACID:

Mass = no. of moles × molar mass

Molar mass of (C3H6O3) = 12(3) + 1(6) + 16(3)

= 36 + 6 + 48

= 90g/mol

Mass of lactic acid = 0.5 mol × 90 g/mol

Mass of lactic acid = 45grams.

Hence, there are 45 grams of lactic acid in 1 liter of a 0.5M solution of lactic acid.

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Answer:

111.677 grams

Explanation:

1 moles of CuBr2 is equal to 223.354 grams.

0.5 moles of CuBr2 would be 223.354(0.5) = 111.677 grams.

Answer:

112.22 g

Explanation:

mass = no. of moles x atomic mass

From the periodic table, we can see the atomic mass of Ca is 40.078.

Therefore,

mass = 2.80 x 40.078

= 112.22g (corrected to 2 decimal places.)

Answer:

D: A volcanic Eruption

Explanation:

I took the quiz! Hope this helps!

Answer:

34.08g

Explanation:

(Take the atomic mass of N=14.0, H=1.0)

no. of moles = mass / molar mass

no. of moles of N2 used = 28.02 / (14x2)

= 1 mol

Since H2 is in excess and N2 is the limiting reagent, the no. of moles of NH3 produced depends on the no. of moles of N2 used.

From the equation, the mole ratio of N2:NH3 = 1: 2,

which means one mole of N2 produces 2 moles of NH3.

From the ratio, we can deduce the no. of moles of NH3 produced = 1 x 2 =2moles.

Mass = no. of moles x molar mass

Mass of NH3 produced = 2 x (14.0+1.0x3)

= 34g

≈34.08g (this happens because the atomic mass I took is only corrected to 1 decimal place, but in the end, this is only a very small error in the decimals. Make sure you take a look if the question provides the atomic mass:) )