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Explanation:

Each element has its own unique properties. Each contains a different number of protons and neutrons, giving it its own atomic number and mass number. The atomic number of an element is equal to the number of protons that element contains.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

We have

[tex]n = \frac{1.00 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1}{6.02} \\ = 0.166112[/tex]

We have the final answer as

Hope this helps you

Answer:

Amount of Alcohol volume present in solution = 44.99 ml

Explanation:

Given:

Total volume of solution = 409 ml

Amount of Alcohol percentage present in solution = 11%  

Find:

Amount of Alcohol volume present in solution

Computation:

Amount of Alcohol volume present in solution = Total volume of solution x Amount of Alcohol percentage present in solution

Amount of Alcohol volume present in solution = 409 x 11%

Amount of Alcohol volume present in solution = 409 x 0.11

Amount of Alcohol volume present in solution = 44.99 ml

Answer: 19.20 g. Explanation: ∵ mass % = [mass of solute/mass of solution] x 100.Apr 30, 2019

Explanation: I don't know if this helped but uh yeah.

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Answer:

This molecule is made up of 3 equally spaced sp2 hybrid orbitals arranged at approximately 120o angles. The shape of the orbitals is planar triangular. One orbital contains a lone pair of electrons.

Answer:

My guess is A.

Explanation:

Answer: the amount of force on the spring scale

Explanation:

Explanation:

Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass. Compounds are produced through different whole-number combinations of atoms.

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Answer: Boiling the water

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Answer:

C, regulate temperature

Explanation:

Bones take no part in temperature regulation throughout the body.

Answer:

salty and

Crystals or white crystalline powder.

Transparent and colourless in crystalline form – rather like ice.

Crystallises in the isometric system, usually in the form of cubes.

Soluble in water (35.6g/100g at 0°C and 39.2g/100g at 100°).

Slightly soluble in alcohol, but insoluble in concentrated hydrochloric acid.

Explanation:

Answer:

sea salt, black salt I only know two of them

Answer:

[tex]50\; \rm mL[/tex] of the stock solution would be required.

Explanation:

Assume that a solution of volume [tex]V[/tex] contains a solute with a concentration of [tex]c[/tex]. The quantity [tex]n[/tex] of that solute in this solution would be:

[tex]n = c \cdot V[/tex].

For the solution that needs to be prepared, [tex]c = 0.20\; \rm M = 0.20\; \rm mol \cdot L^{-1}[/tex]. The volume of this solution is [tex]V = 250.0\; \rm mL[/tex]. Calculate the quantity of the solute (magnesium chloride) in the required solution:

[tex]\begin{aligned}n &= c \cdot V \\ &= 0.20\; \rm mol \cdot L^{-1} \times 250.0\; \rm mL \\ &= 0.20\; \rm mol \cdot L^{-1} \times 0.2500\; \rm L \\ &= 0.050\; \rm mol\end{aligned}[/tex].

Rearrange the equation [tex]n = c \cdot V[/tex] to find an expression of volume [tex]V[/tex], given the concentration [tex]c[/tex] and quantity [tex]n[/tex] of the solute:

[tex]\displaystyle V= \frac{n}{c}[/tex].

Concentration of the solute in the stock solution: [tex]c(\text{stock}) = 1.00\; \rm M = 1.00\; \rm mol \cdot L^{-1}[/tex].

Quantity of the solute required: [tex]n = 0.050\; \rm mol[/tex].

Calculate the volume of the stock solution that would contain the required [tex]n = 0.050\; \rm mol[/tex] of the magnesium chloride solute:

[tex]\begin{aligned}& V(\text{stock}) \\ &= \frac{n}{c(\text{stock})} \\ &= \frac{0.050\; \rm mol}{1.00\; \rm mol \cdot L^{-1}} \\ &= 0.050\; \rm L \\ &= 50\; \rm mL\end{aligned}[/tex].

Answer:

16.9g

Explanation:Cu+2AgNO3→2Ag+Cu(NO3)2  

Cu will likely have a +2 oxidation state. It is higher in the activity series than Ag, so it is a stronger reducing agent and will reduce Ag in a displacement reaction. Then you need to balance the coefficients knowing than NO3 is -1 and Ag is +1.

Then to calculate the theoretical yield you need to compare moles of the reactants:

m(Cu)=5g

M(Cu)=63.55

n(Cu)=5/63.55=0.0787

By comparing coefficients you require twice as much silver: 0.157mol

n(Ag)=0.157

M(Ag)=107.86

m(Ag)=0.157x107.86=16.9g

Hence, the theoretical yield of this reaction would be 16.9g

Answer:

The nucleus splits into two or more lighter nuclei, releasing kinetic energy, gamma radiation, and free neutrons. A portion of these neutrons may later be absorbed by other fissile atoms and trigger further fission events, which release more neutrons, and so on. This is known as a nuclear chain reaction.

Explanation:

Answer:

Atom Labeling

Explanation:

Y- neutron

Z-protron

X - electron

W- nucleus

Answer:

Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.

Explanation:

meaning of versatile: capable of or adapted for many different uses, skills, etc. 2 variable or changeable.

The versatile nature of carbon can be best understood with its features such as, tetravalency and catenation. In this section let us learn more about versatility of carbon.

Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.

The two characteristic features seen in carbon, that is, tetravalency and catenation, put together give rise to a large number of compounds. Many have the same non-carbon atom or group of atoms attached to different carbon chains.

Catenation: The property of forming long chains by self-linking with other carbon atoms to form long chains, rings, double or triple bonds is called catenation.

Isomerism: Compounds with same molecular formula but different structural formula are called isomers. An isomerism commonly seen is due to difference in the arrangement of atoms or groups of atoms & is called structural isomerism. The 4 types of structural isomerism are:

 Chain isomerism

 Position

 Functional

Metamerism

Tetravalency: Carbon has 4 electrons in its valence shell. Energy considerations do not allow it to gain or lose 4 electrons; therefore it forms covalent bonds with other elements to complete its octet. This accounts for its tetravalency and explains its ability to form a variety of compounds.

Answer:

d. 200.

Explanation:

The reaction is:

2KMnO4 + 16HCl ----> 2KCl + 2MnCl2 + 8H2O + 5Cl2

So 2 moles of KCL are produced form  16 moles of HCL

So 25 moles KCL are made from   25 * (16/2) HCl.

= 25 * 8

= 200 moles. HCl.

Answer:

Cs, Os, Sn, Br

Explanation:

Metallic character increases to the left and down the periodic table.

Answer:

B i tyink

Explanation:

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To obtain sand and water from mixture 1 , filtration process will be used.

To obtain salt from water in mixture 2 , crystallisation will be done.

Physical wastewater treatment processes include use of racks, screens,  clarifiers (sedimentation and flotation), and filtration. Chemical or biological reactions are important treatment processes, but not part of a physical treatment process.

It is given that the mixture contains

Mixture 1 contains sand and water

Mixture 2 contains salt and water

To obtain sand and water from mixture 1 , filtration process will be used.

To obtain salt from water in mixture 2 , crystallisation will be done.

To know more about Physical Treatment Process

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Answer:

Mg3N2

Explanation:

it has an inorganic compound for Magnesium and Nitrogen. if you put this two together it will the compound Magnesium nitride.

Explanation:

a. pressure always favors the side with fewer molecules. in this reaction as both the sides have equal number of molecules, there won't be any change in the position of the equilibrium.

b. when the concentration of the hydrogen gas is increased. more particles would take place in the reaction and so, the rate of reaction would increase favoring the reaction concerning hydrogen gas molecules (backward reaction in this case) therefore, equilibrium would shift to the backward reaction (left).

c. as forward reaction is endothermic, when temperature is increased the equilibrium will shift to the forward reaction (right).

d. catalyst would not have any effect on the position of the equilibrium. it will only increase the rate of reaction.

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Meteorite: One the surface of Earth

Meteoroid: In outer space

Meteor: Entering Earths atmosphere

Explanation:

Answer: In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.

Explanation:

internet

Answer: a) pH = 2.56 , acidic

b) pH = 2.38, acidic

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

[tex]pH=-\log [H^+][/tex]

a) [tex][H^+]=2.7\times 10^{-3}[/tex]

Putting in the values:

[tex]pH=-\log[2.7\times 10^{-3}][/tex]

[tex]pH=2.56[/tex]

Thus as pH is less than 7, the solution is acidic.

b) [tex][H^+]=4.1\times 10^{-3}[/tex]

Putting in the values:

[tex]pH=-\log[4.1\times 10^{-3}][/tex]

[tex]pH=2.38[/tex]

Thus as pH is less than 7, the solution is acidic.

Answer:

(2) 50 kg

(3) 73.75 J/kg.K

Explanation:

(2) From the question,

Using,

q = mcΔt........................ Equation 1

Where q = amount of heat, m = mass. c = specific heat capacity, Δt = change in temperature

make m the subject of the equation

m = q/(cΔt)..................... Equation 2

Given: q = 1.500 J, c = 1.0 J/kg.K, Δt = 30°C

substitute these values into equation 2

m = 1500/(1×30)

m = 50 kg

(3) using

q = cm(t₂-t₁).

Where t₁ and t₂ = initial and final temperature respectively

making c the subject

c = q/m(t₂-t₁)................ Equation 3

Given: q = 41.3 J, m = 16 g = 0.016 kg, t₂ = 80°C, t₁ = 45°C

Substitute these values into equation 3

c = 41.3/0.016(80-45)

c = 41.3/0.56

c = 73.75 J/kg.K