If 5. 0 grams of kcl is dissolved in 500 ml of water, what is the concentration of the resulting solution?

A. Carbon-14 can be used to date remains as far back as 60,000 years.

Carbon dating is a method for determining the age of an object containing organic material by using the properties of radioactive isotope of carbon.

Carbon-14 dating can be used to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years old.

Thus, Carbon-14 can be used to date remains as far back as 60,000 years.

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Answer: The answer is fatty acids and triglycerides

Explanation:

As per ideal gas equation ,

 [tex]C_{3}H_{6}[/tex] Volume   = 11.56 L

[tex]CO_{2\\}[/tex] volume =  8.62L

What is Ideal gas equation?

PV = nRT

[tex]C_{3} H_{6}[/tex] gas burns in air according to following equation:

[tex]2C_{3}H_{6}[/tex] + [tex]9O_{2}[/tex] → [tex]6CO_{2}[/tex] + [tex]6H_{2} O[/tex]

Volume of [tex]C_{3} H_{6}[/tex] produced;

Step 1 : Calculate the moles of [tex]H_{2} O[/tex]

PV = nRT

n = PV / RT

n = 0.762 × 34.7 / 0.08206 × 302.55

n = 1.065 mol

Step 2: Calculate the moles of [tex]C_{3} H_{6}[/tex]

1.065 mol [tex]H_{2} O[/tex]× 2 mol [tex]C_{3} H_{6\\}[/tex] / 6 mol [tex]H_{2} O[/tex]

= 0.355 mol

Step 3 : Calculate new volume

V = 0.355 × 0.08206 × 302.55 / 0.762

V = 11.56 L

Volume of [tex]CO_{2}[/tex] produced;

Step 1: Calculate the moles of [tex]O_{2}[/tex]

18.7g [tex]O_{2}[/tex] × 1 mol [tex]O_{2}[/tex] / 32 g [tex]O_{2}[/tex]

= 0.58 mol

Step 2: calculate the moles of [tex]CO_{2}[/tex]

0.58 mol × 6mol [tex]CO_{2}[/tex] / 9 mol [tex]O_{2}[/tex]

= 0.38 mol

Step3: convert mol to litres

0.38 × 22.7L / 1mol [tex]CO_{2}[/tex]          [22.7L = 1mol]

= 8.62 L

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A  bond issue consists of a number of bonds, usually in denominations of  $1,000 and $5,000.

The term bond refers to a sort of investment in which an individual loans  money to the government or sometimes to the government in return for an interest on the investment. This interest is paid to the individual regularly as a return on his/ her investment.

Hence a bond issue consists of a number of bonds, usually in denominations of  $1,000 and $5,000.

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Missing parts;

Bonds are securities that can be readily bought and sold. A bond issue consists of a number of bonds, usually in denominations of ______ or _____ and is sold to many different lenders.

Multiple choice question.

$100; $1,000

$1,000; $10,000

$500; $5,000

$1,000; $5,000

When the system turns pink, then the end point has been attained.

The end point or the equivalence point is the time when the reactants have undergone transformation in accordance with the reaction equation. The reaction in this case is; HCl + NaOH -----> NaCl + H2O.

We know that phenolphthalein is colorless in acid but red in a base. The color at end point is pink. Thus, when the system turns pink, then the end point has been attained.

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Mass after 60 years:

2 kg of cesium-137 will remain after 60.0 years.

What is Half-life?

The duration needed for a quantity to decrease to half of its initial value is known as the half-life.

Given:

N0 = is the initial amount of cesium-137 = 8.0 Kg

N = is the amount remaining after a time =  Unknown

t =  Duration of cesium-137 decay in 8.0 Kg = 60 years

t1/2 = half-life of cesium-137 = 30.0 years

Formula = N/No = (1/2)^t/t1/2

After putting the value:

N/8= (1/2)^60/30

N/8= (1/2)^2

N/8= 1/4

4N= 8

N= 8/4

N= 2 Kg

As a result, 2 Kg of cesium-137 will be present after 60 years.

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Since Qp>Kp , the reaction is not at equilibrium.

The equilibrium constant shows the extent to which reactants are converted into products.

Now we have to obtain the Qp as follows;

Qp =[CH3OH]/[CO] [H2]^2

Qp = 0.265/(0.265) (0.265)^2

Qp = 14.2

Now we know that Kp = 6.09×10−3, Since Qp>Kp , the reaction is not at equilibrium.

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B. The chemical reaction that represents oxidation - reduction reaction is CaCO3(s) → CaO(s) + CO2(g).

In oxidation reduction reaction, the oxidizing agent is reduced while reducing agent is oxidized.

CaCO3(s) → CaO(s) + CO2(g)

Calcium (ca) is oxidized calcium (II) ion while the carbon (IV) oxide is reduced carbon (IV) oxide.

Thus, the chemical reaction that represents oxidation - reduction reaction is CaCO3(s) → CaO(s) + CO2(g).

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Answer: The answer is B

Explanation: on edge

It does not have a strong seasonal influence on ozone over the Northern Hemisphere.

Three oxygen atoms make up ozone, a highly reactive gas. The stratosphere, the upper atmosphere of the planet, and the lower atmosphere both include this naturally occurring and artificial substance (the troposphere). Ozone has an impact on life on Earth, but only depending on where it resides in the atmosphere.

Molecular oxygen and solar ultraviolet (UV) light interact to naturally create stratospheric ozone. The "ozone layer," which is located 6 to 30 miles above the Earth's surface, decreases the quantity of dangerous UV light that reaches the surface.

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In an ionic lattice, atoms are packed together in a regular cubic arrangement; option A.

An ionic compound is a compound which is composed of oppositely-charged ions which are held together by strong electrostatic forces of attraction.

The properties of ionic compound include:

Ionic lattices have regular structural patterns consisting of atoms arranged in a regular repeating pattern, usually a cube. There are several cubic structures in ionic lattices.

In conclusion, ionic lattices are regular repeating arrangement of atoms. Ionic lattices are usually arranged in the form of cubic crystal.

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the pressure in the balloon decreases- True

the pressure in the balloon increases- False

the volume of the balloon increases- True

the volume of the balloon decreases- False

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Answer:

1.) 13 g C₄H₁₀

2.) 41 g CO₂

Explanation:

To find the mass of propane (C₄H₁₀) and carbon dioxide (CO₂), you need to (1) convert mass O₂ to moles O₂ (via molar mass), then (2) convert moles O₂ to moles C₄H₁₀/CO₂ (via mole-to-mole ratio from equation coefficients), and then (3) convert moles C₄H₁₀/CO₂ to mass C₄H₁₀/CO₂ (via molar mass). It is important to arrange the ratios in a way that allows for the cancellation of units. The final answers should have 2 sig figs to match the sig figs of the given value.

Molar Mass (C₄H₁₀): 4(12.011 g/mol) + 10(1.008 g/mol)

Molar Mass (C₄H₁₀): 58.124 g/mol

Molar Mass (CO₂): 12.011 g/mol + 2(15.998 g/mol)

Molar Mass (CO₂): 44.007 g/mol

Molar Mass (O₂): 2(15.998 g/mol)

Molar Mass (O₂): 31.996 g/mol

2 C₄H₁₀ + 13 O₂ ----> 8 CO₂ + 10 H₂O

 48 g O₂             1 mole             2 moles C₄H₁₀            58.124 g
---------------  x  -----------------  x  -------------------------- x  ------------------  =  
                         31.996 g              13 moles O₂               1 mole

=  13 g C₄H₁₀

 48 g O₂             1 mole               8 moles CO₂            44.007 g
---------------  x  -----------------  x  -------------------------- x  ------------------  =  
                         31.996 g              13 moles O₂               1 mole

=  41 g CO₂

Answer:

In solid

Explanation:

As a solid has very tightly packed molecules which move very difficulty and only vibrate

Different half-life expressions can be chemically derived from integrated rate laws.

In chemistry, the expression 'integrated rate laws' makes reference to the integration of different rate laws.

The constant rate refers to the specific amount of a given substrate or reactant that is used in a chemical reaction to produce a specific amount of product during such reactions.

The constant rate is very useful to determine the time required to generate a given amount of a product in a given chemical reaction (expressed per unit of time).

In conclusion, different half-life expressions can be chemically derived from integrated rate laws.

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Since volume and temperature are constant, this means that pressure and number of moles are directly proportional. the sample with the largest number of moles will have the high pressure.

Since, the ideal gas equation is also called ideal gas law. So,  according to ideal gas equations,

PV = nRT

At constant volume and temperature the equation become ,

P ∝ nR

since, R is also constant. So, conclusion of the final equation is

P  ∝ n

The number of moles and pressure of the sample is directly proportion. So, on increasing number of moles in the sample , pressure of the sample also increases.

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Answer:

D.) A symbol of magnesium Mg has two dots representing two free electrons.

Explanation:

Magnesium is located in the second group (column) of the periodic table. Elements located here have 2 valence electrons in their outermost shell. Thus, the electron dot diagram of magnesium has 2 dots symbolizing the 2 valence electrons.

Valence bond theory stating that a bond between two atoms is the strongest when the nuclei of the atoms are touching each other is true.

This theory states that when two valence orbitals of two different atoms overlap on each other, the bond is usually strong.

The bond formed in this scenario is usually covalent which involves sharing of the valence electrons.

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Answer: concentration

Explanation:

This is a fact.

The net ionic equation is:

2Ag⁺(aq) + 2Cl⁻(aq) → 2AgCl(s)

The given equation is:

2AgNO₃ (aq) + CaCl₂ (aq) → 2AgCl(s) + Ca(NO₃)₂ (aq)

A double displacement reaction occurs when silver nitrate and calcium chloride are combined. Silver chloride precipitate and a calcium nitrate solution are the results of the reaction.

Break down all the soluble electrolytes, that are present in an aqueous form, into their respective ions:

2Ag⁺(aq) + 2NO³⁻(aq) + Ca²⁺(aq) + 2Cl⁻(aq) → 2AgCl(s) + Ca²⁺(aq)+ 2NO³⁻(aq)

Now remove all the spectator ions present in the equation. The spectator ions should be removed after comparing the reactant and product sides of the revised reaction. These dissolved ions are known as spectator ions if they exhibit the same form on both sides. No reaction occurs if everyone is a spectator ion.

Now write the net ionic equation:

2Ag⁺(aq) + 2Cl⁻(aq) → 2AgCl(s)

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Iron (iii) chloride is obtained by vapor condensation from the reaction between chlorine gas and iron fillings.

Iron (ii) chloride can be formed from iron fillings in the laboratory as follows:

Chlorine gas is introduced into a reaction vessel containing iron fillings and the iron (iii) chloride vapor formed is obtained by condensation.

In conclusion, iron (iii) chloride is formed by the the direct combination of iron fillings and chlorine gas.

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The property a radioisotope used for dating should have is Its half-life should be similar to the age of the fossil and is denoted as option B.

This is an element which is unstable and releases radiation to achieve its stability.

The half-life of the element used in dating should be similar to that of the fossil for easy comparisons and accuracy.

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Answer:

b, half life should be similar to the fossil

Explanation:

The group that makes the most precise measurements of the object's temperature is Group C : 32.1°C, 31.9°C, 31.8°C. That is option C.

Precise measurement are those values that are gotten during a measurement which when compared are closest to the given constant value.

Precision refers to a value in decimal numbers after the whole number, and it does not relate with accuracy.

From the measurement gotten from the different groups, the results that are precise are the results of group C.

This is so because,

All the values gotten are in decimals as stated above. Therefore, the group that makes the most precise measurements of the object's temperature is Group C.

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Answer:

1. Mixture

2. Compound

3. Compound

4. Element

Explanation:

Number 1 shows two completely different types of compounds in the same space, so it is a mixture.

Numbers 2 and 3 are compounds because there aren't different types compounds as in Number 1, but the same compound repeated. 2 is a compound because while all of the circles are the same element, they are connected. O2 for example, oxygen, is a compound.

Number 4, finally, is all of the same substance, non-connected, so it shows an element.

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If chemical A has a toxicity level of one and chemical B has a toxicity level of two and the mixture of these two chemicals has a toxicity level of three, it means that the mixture of these two chemicals form a synergistic mixture.  This is condition is known as synergism.

A synergistic effect is exerted when a greater effect is exerted than the added effect of both the chemicals together. This is applicable for toxic chemicals as well as non-toxic chemicals. Synergism can be dangerous in the case of both toxicology or chemicals in general. The greater effect of toxic chemicals can result in a dangerous mixture, which could prove to have fatal effects in many cases.  The opposite of synergistic effect is antagonistic effect. The antagonistic effect is the effect where the overall effect of these two chemicals would be less than the sum of the effects imparted by the individual chemicals.

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Answer:

Aluminum

Explanation:

Each chlorine atom needs one more valence electron to have a full valence electron shell, so X needs to have 3 valuence electrons. The only that satisfies this is aluminum.

A measure of peak separation in a chromatographic method that equals the difference in retention time for two components divided by the average of their peak widths is the definition of resolution.

Retention time can be referred to as the amount of time a solute spends in the stationary and mobile phases of a column.

The analyte's interaction with the stationary phase determines the longer retention period.

The duration of retention will increase as the interaction becomes more strong.

Resolution is defined as the peak separation in a chromatographic procedure that is equal to the difference in retention time for two components divided by the average of their peak widths.

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Answer:

[tex]\huge\boxed{\sf 5\ moles\ of\ oxygen}[/tex]

Explanation:

[tex]C_3H_8+5O_2 \longrightarrow 4H_2O+3CO_2[/tex]

From the reaction, we can say that,

So, to generate 3 mole of carbon dioxide, 5 moles of oxygen are required. (as shown in the chemical reaction!)

[tex]\rule[225]{225}{2}[/tex]

The answer is 1) mixing of two gases by diffusion.

Once 2 gases are mixed by diffusion, they cannot be obtained from the mixture of gases. Hence, it is considered to be an irreversible process.

Answer:

(1) Acid -------------------------------------> (G) When dissolved in water, its solution has a pH value less than 7. Acids are proton (H⁺ ion) donors.

(2) Alkali -----------------------------------> (E) The oxide, hydroxide, or carbonate of a metal that will react with an acid, forming a salt as one of the products (if a base dissolves in water it is called an alkali. Bases are proton (H⁺ ion) acceptors.

(3) Base ------------------------------------> (I) Its solution has a pH value of more than 7.

(4) Blast furnace ------------------------> (C) The huge reaction vessels used in industry to extract iron from its ore.

(5) Displacement reaction ----------> (R) A reaction in which a more reactive element takes the place of a less reactive element in one of its compounds or in solution.

(6) Mole -----------------------------------> (A) A very large number that is the amount of substance in the relative atomic or formula mass of a substance.

(7) Neutral -------------------------------> (J) A solution with a pH value of 7 which is neither acidic nor alkaline. Alternatively, something that carries no overall charge.

(8) Neutralization ----------------------> (F) The chemical reaction of an acid with a base in which a salt and water are formed. If the base is a carbonate of hydrogen carbonate, carbon dioxide is also produced in the reaction.

(9) Ore -------------------------------------> (P) Ore is rock which contains enough metal to make it economically worthwhile to extract the metal.

(10) Oxidation --------------------------> (B) A reaction where oxygen is added to a substance / or when electrons are lost from a substance.

(11) pH -------------------------------------> (O) A number which shows how strongly acidic or alkaline a solution is.

(12) Pipette ------------------------------> (N) A glass tube used to measure accurate volumes of liquids.

(13) Precipitate -------------------------> (K) An insoluble solid formed by a reaction taking place in solution.

(14) Reactant ---------------------------> (M) A substance we start with before a chemical reaction takes place.

(15) Reduction -------------------------> (S) A reaction in which oxygen is removed or electrons are gained.

(16) Salt ----------------------------------> (Q) A salt is a compound formed when some or all of the hydrogen in an acid is replaced by a metal.

(17) Strong acids ---------------------> (L) These acids completely ionize in solution and have a high concentration of H⁺ (aq) ions in solution.

(18) Universal indicator ------------> (H) A mixture of indicators that can change through a range of colors to show how strongly acidic or alkaline liquids and solutions are.

(19) Weak acids ---------------------->  (D) Acids that do not ionize completely in aqueous solutions.

This causes organic matter to decompose faster, releasing larger amounts of carbon dioxide into the atmosphere

As a result of climate change, tundra soils are thawing deeper and deeper and for a longer time in the upper layers of surface.

The tundra is a biome on the Earth that covers approximately 20% of its land mass, and it is almost exclusively located in the Northern Hemisphere.

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