EASY CHEMISTRY QUESTIONS FOR 100 POINTS

Answer:

proton= 17

neutron=18

electron=16

The unit of the density of the substance from cg/L to mg/mL is 7.4 x 10²⁶ mg/mL.

Unit conversion is a method or a way of converting a given quantity from one unit to another.

The density of a substance can be measured in different units as shown blow;

The density of the substance can be converted to the required unit as shown below.

7.4 x 10²⁸ cg/L to mg/ml

= (7.4 x 10²⁸ cg/L) x (10 mg/cg) x (1 L / 1000 mL)

= 7.4 x 10²⁶ mg/mL

Thus, the unit of the density can be converted from centigram per liter to milligram per milliliter.

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Answer:

Explanation:

Many materials can be used in making textiles. The materials are mainly from animal, plant, mineral and synthetic sources. The examples are as follows;

The statement that is true if the ΔEsys = -100 J is that the system looses 100J  of energy which is gained by the surroundings.

Note that the study of energy is what we call thermodynamics. We should note that according to the laws of thermodynamics, energy can not be created nor destroyed but can be converted from one form to another.

This implies that the energy that is lost by the system must be gained by the surroundings since there can never be energy that goes to waste in the system.

Recall that the universe is composed of the system and the surroundings and the energy that is lost by the system must be gained by the surroundings and vice versa. This would now be our guide in deciding which statement is right above from what we have in the question here.

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The group that accounts for the difference among the various amino acids is the side chain (option B).

Amino acids are any chemical molecule that has both an amino and a carboxylic acid functional group.

The antecedents or building blocks of protein molecules are known as amino acids. Ingredients that make up amino acids include:

The R group, a particular side chain, is also joined to the carbon in each of the 20 amino acids. The shapes, sizes and charges of the R groups vary. As a result, amino acids can be categorized based on the characteristics of their side chains.

All amino acids have the same amino and carboxyl groups; the R group, however, differs for each amino acid.

In nature, there are 20 different amino acids, each of which has an amino and carboxyl group. However, what sets them apart from one another is that they each have a unique R (side) chain.

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Answer:

H2O

Explanation:

H2O should deviate from ideal behavior the most. Remember that an ideal gas has molecules which don't interact. Argon exists as an monoatomic element in the gas state, and the atom is neutral throughout. This means that two argon atoms only interact with each other through London dispersion forces or bumping. However, water is polar, so water molecules will attract each other strongly through permanent dipole-dipole interactions and hydrogen bonding. This means that water vapor deviates from ideal behavior the most

The unknown elements based on their physical properties are as follows:

Element 1 is Krypton

Element 2 is Strontium

Element 3 is Lead

Element 4 is Bromine

Element 6 is Francium

Some of the physical properties of elements used to identify the elements include:

Considering the properties of the given elements from the periodic table:

Element 1 = Krypton

Element 2 = Strontium

Element 3 = Lead

Element 4 = Bromine

Element 5 = Copper

Element 6 = Francium

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The following factors can affect the solubility of a substance is temperature and pressure

Solubility is the maximum amount of substances that will dissolve in a given amount of solvent at specific temperature and solubility is the characteristics property of specific solute and solvent combination and different substances has greatly different solubility's and there are two direct factor that affect the solubility and they are temperature and pressure and temperature affect solubility of both solid and gases but pressure only affect the solubility of gases

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Calculation also includes applying logic to a non-numerical issue. Exponentiation comes first, followed by multiplication and division, and then addition and subtraction, as is the case for each mathematical equation.

A computation is a methodical, well-thought-out process. Calculating the solution to a math problem is the first type of calculation, for which you might use a calculator. Calculation also includes applying logic to a non-numerical issue.

Exponentiation comes first, followed by multiplication and division, and then addition and subtraction, as is the case for each mathematical equation.

1 km = 1000 m; 1 hr = 3600 sec.

[1 km/hr = 1000/3600 m/sec = 5/18 m/sec

To convert km/hr into m/sec, multiply the number by 5 and then divide it by 18.]

83km.h-1  = 83 × 5/18 = 23.05

= 23 m.s-1

83 km.h-1 + 83 m.s-1   = 23 m.s-1 + 83 m.s-1

= 106 m.s-1

Therefore, the correct answer is 106 m.s-1.

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We can say that Javier is right because the reactivity of the elements tends to decrease from left to right.

The periodic table is an arrangement of the elements in order of increasing atomic number. Let us note that the modern periodic law states that the properties of the elements is a periodic function of their  atomic numbers .Thus the atomic numbers of the elements tends to increase from left to right in the periodic table as we can see in the image that have been attached to the question above.

Now, we know that the reactivity of the elements also tend to decrease from left to right. This is because, the heavier the element, the less reactive that the element is. Recall that every period that we can find in the periodic table tends to end up with a non reactive noble gas element.

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The What is the molarity of MgCl₂ in the original sample is 1.63 mol/L

[tex]Molarity = \frac{Mass\ of\ MgCl_2}{molar \ mass\ of MgCl_2} \times\frac{1}{volume \of \ the\ solution \ in\ litres}[/tex]

[tex]Molarity = \frac{156g}{95.211g/mol} \times\frac{1}{1L}\\\\Molarity = 1.63 \ mol/L[/tex]

Molarity (M) is the amount of a substance in a certain volume of solution. Molar concentration is a measure of the concentration of  chemical compounds, especially a solute in a solution, as the amount of the substance per unit volume of the solution. In chemistry, the most commonly used unit of molarity is the number of moles per litter, indicated in the SI unit  mol/L or mol/dm³.

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Explanation

Given

N2(g)+3H2(g)—> 2NH3(g)

Number of moles of nitrogen = 1.5 moles

Number of moles of hydrogen = 6 moles

Required: Limiting reagent

Solution

For Nitrogen:

For Hydrogen:

The limiting reagent is Nitrogen, because less moles of NH3 will be produced by nitrogen, meaning it all of it gets used up.

Answer

The limiting reagent is Nitrogen.

The percentage by mass of sodium in a 25 g sample of sodium chloride =39.92%

A chemical compound is made up of two or more elements which are chemically combined together.

For example sodium chloride which contains sodium and chloride are chemically combined together to form sodium chloride as a chemical compound.

The first compound of sodium chloride= 5g

The percentage that is sodium= 39.34%

The second compound of sodium chloride= 25g

The percentage that is sodium= x%

That is = 5g = 39.34%

Therefore quality of sodium in grams;

= 39.34/100× 5

= 0.3934× 5

= 1.967g

Therefore if 5g of NaCl contains 1.967g of Na

25g of NaCl will contain xg

Make xg the subject of formula,

= 25×1.978/5

= 49.45/5

= 9.98g of sodium.

To conver 9.98g to %;

=9.98/25 × 100/1

= 0.3992×100/1

= 39.92% of sodium.

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The statement about sub-atomic particles that is true is:

Sub-atomic particles refer to the smaller particles that are the constituents of atoms of elements.

There are three sub-atomic particles within a given atom,

The three sub-atomic particles are given below:

Considering the given statements about the sub-atomic particles, the only true statement is that which describes the mass of the electron as being the smallest of the three sub-atomic particles.

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Complete question:

Which statement about subatomic particles is true?

Protons are the only subatomic particles to have a charge.

Electrons are the subatomic particles with the smallest mass.

Neutrons orbit the nucleus of the atom.

Subatomic particles all have the same mass

Moles of potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced is 28.63 mole

Potassium nitrate is an inorganic salt with a chemical formula of KNO₃ it is a natural source of nitrate and has been used as a constituent for several different purposes including food preservatives, fertilizers, tree stump removal, rocket propellants, and fireworks

Here given data is

4.4 moles of aluminum phosphate

We have to find  moles of potassium nitrate =?

Number of mole = mass of substances/mass of one mole

Number of mole = 126/ 4.4 moles

Number of mole = 28.63mole

So, 28.63 mole potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced

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Answer:

6186.98

Explanation:

105.4 mol of nickel is 6186.98 nickel

Answer:

7 sublevels (i think)

Explanation:

i will assume n is the principle quantum number, so the sublevels is l.
l can equal 0, 1, 2... all the way up to n-1, in this case, 7-1, or 6
This means the sublevels are:
0,1,2,3,4,5,6, for a total of 7 sublevels

Atomic Structure - Dalton's Atomic Theory

From Dalton's experiments and observations, and from the work of some of his colleagues he proposed a new theory of the atom.

Answer:

For answering we will have to create a 5x3 table. It will have the following headings:

The information that has to go in the table is:

Dalton's Postulates

1.1:All matter is composed of extremely small particles called atoms.

2.1: Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass and other properties.

3.1: Atoms cannot be subdivided, created or distroyed.

4.1 Atoms of different elements can combine in simple whole number ratios to form chemical compounds.

5.1: In chemical reactions, atoms are combined, separated or rearranged.

Keep/Modify/Discard:

1.2:Keep

2.2:Modify

3.2:Modify

4.2:Keep

5.2:Keep

Rewrite in case of need:

1.3: No need

2.3: Atoms of different elements differ in size, mass and other properties. Atoms of a given element can also differ in mass.

3.3: Atoms can be further subdivided, and using nuclearfission and fussion techniques atoms can be created or destroyed by changing them into other atoms.

4.3:No need

5.3: No need

Answer:

chicken tenders and egg rolls and butter fingers

The maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.

The formula for the the limiting reagent is H₂

The amount of excess reagent that remains after the reaction is 3.86 g.

The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.

The limiting reagent is determined by balancing the chemical equation as follows;

H₂ + C₂H₄  --------> C₂H₆

From the reaction above;

1 mole of hydrogen gas = 1 mole of ethylene = 1 mole of ethane

2 g of hydrogen gas (H₂)  = 30 g of ethane (C₂H₆)

0.61 g of H₂ = ? of C₂H₆

= (0.61 x 30)/2

= 9.15 g of C₂H₆

Thus, the maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.

The formula for the the limiting reagent is H₂ because it will be completely used up.

2 g of H₂ = 28 g of C₂H₄  -

0.61  of H₂ = ?

= (0.61 x 28)/2

= 8.54 g

Excess mass of the ethylene that remains = 12.4 g - 8.54 g = 3.86 g

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Answer:

0.43 M

Explanation:

The equation that should be used in this case would be:
pOH = pKb + log([A+]/[Base])
pKb = -log (4.6*10^-4) = 3.34
pOH = 14-10.2 = 3.8
[Base] = 0.15
3.8 = 3.34 + log x/0.15
0.46=log x/0.15
10^(0.46) = x/.15
x = 10^(0.46)  * 0.15 = 0.43 M

When cirrus clouds are above a deck of altocumulus clouds, occasionally a clear area, or “hole” will appear in the altocumulus cloud layer which is caused by supercooled water in the clouds suddenly evaporating.

This is referred to as a mass of condensed watery vapor which are floating in the atmosphere and results in precipitation due to continued condensation in the form of rain, snow etc.

There are different types of clouds and in a scenario where a clear area, or “hole” will appear in the altocumulus cloud layer then it is as a result of the supercooled water in the clouds suddenly evaporating and creating the space seen or observed.

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The bonds do not have energy, the atoms release heat.

change: unmarried alternative AB + C → AC + B

exchange: Double alternative AB + CD → ad + CB

mixture (Synthesis) A + B → AB

Decomposition AB → A + B

A chemical reaction is a method that ends in the chemical transformation of one set of chemical substances to some other.

A procedure that includes rearrangement of the molecular or ionic shape of a substance, in preference to a exchange in bodily form or a nuclear reaction.

A chemical response is a technique in reactants react chemically and convert into products via chemical transformation. as an example, breathing – we inhale oxygen which reacts with glucose and produces carbon dioxide, water and strength. The response is given below. C6H12O6 + 6O2 → 6CO2 + 6H2O + power.

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A small sample of chloride salts of group I metals on stirring with water on a beaker, at least some of the solid added will cease to be visible at the bottom of each beaker.

Group I elements are Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium and Francium.

When chloride salts of these elements where dissolved in water it would not produce bubbles or change colour.

In addition to that, not all salts would feel hot to touch when the beaker in which the salt was dissolved is touched. Some would feel cool. This is because of difference in the process happening between the salt and water. For example: HCl would release heat when dissolved in water – Exothermic reaction (Beaker would be hot to touch) whereas KCl would absorb heat  when dissolved in water – Endothermic reaction (Beaker would be cool to touch).

One common thing about chloride salts of group I elements is that they all dissolve in water. The bond between the elements and the chloride is Ionic in nature. In the water, the bond between the molecules is covalent. The covalent bonds are stronger than ionic bonds. Thus, ionic bonds dissociate and covalent bonds would be formed with water and dissociated ions i.e., chloride salts are dissolved in water. When this happens, solid would cease to be visible at the bottom of each beaker.

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Taking into account the definition of dilution, after two dilutions the final concentration is 0.1923 M.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution. This is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know for the first dilution:

Replacing in the definition of dilution:

1.50 M× 68 mL= Cf× 208 mL

Solving:

(1.50 M× 68 mL)÷ 208 mL= Cf

0.49 M= Cf

Now, in a second dilution you take a sample of 104 mL of this diluted solution and add another 161 mL of water. The final volume of the solution will be

Vfinal= 104 mL + 161 mL= 265 mL

The concentration of the 104 mL sample is equal to the concentration of the first diluted solution, this is 0.49 M. Therefore, the concentration of the final solution will be:

0.49 M× 104 mL= Cf× 265 mL

Solving:

(0.49 M× 104 mL)÷ 265 mL= Cf

0.1923 M= Cf

In summary, the final concentration is 0.1923 M.

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Answer:

A. True

Explanation:

Condensation is a chemical reaction of synthesis and represents two organic molecules producing one organic molecule.

Condensation reaction is a reaction of two substances with the simultaneous loss of water or other small molecule.

Condensation reaction is a chemical reaction that synthesizes larger molecules from two or more smaller molecules with the release of water.

An example of condensation reaction is the synthesis of dipeptide (protein) from amino acids building blocks.

Therefore, it can be said that condensation synthesizes larger organic molecules from two smaller ones.

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The element X  in the ionic compound from the question belongs to group 2.

An ionic compound is a compound that is formed when there is a combination of two or more atoms that are combined by the transfer of electrons. Now we know that the transfer of the electrons would give rise to the formation of to ions, a cation and an anion. The cation is the specie that lost electrons while the anion is the specie that gained the electrons. Thus the compound is composed actually of an ions pair that are necessarily of opposite charges from each other.

In this case, an ionic compound has the formula[tex]X_{3} N_{2}[/tex]. We can see that the element X has reacted with nitrogen to form a nitride and that the nitrogen has a subscript of 2 as shown.

The fact the nitrogen has a subscript of 2 shows that the element belongs to group 2.

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