What is the molarity of a solution made of 2.45 moles of LiCl in 4.75 L of solution?

Answer: A long-term environmental change is... ice age, deforestation, urbanization, Earth's orbit, Sun's intensity, global Warming, radioactive waste/pollution. Extinction of species could happen to anyone of the food webs in a long term change.

Explanation:

The rules of base pairing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G)

The nucleotides in a base pair are complementary which means their shape allows them to bond together with hydrogen bonds. The A-T pair forms two hydrogen bonds. The C-G pair forms three. The hydrogen bonding between complementary bases holds the two strands of DNA together.

Answer:

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It's fruitfull to add some more information and some acquired knowledge...

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Answer:

Q = 4133.2 J

Explanation:

Hello there!

In this case, since these calorimetry problems are based off the following heat equation involving heat (Q), mass (m), specific heat (C) and temperatures (T):

[tex]Q=mC(T_2-T_1)[/tex]

Thus, we plug in the given variables to obtain:

[tex]Q=62.0 g*2.433 \frac{J}{g\°C}* (40.5\°C-13.1\°C)\\\\Q=4133.2J[/tex]

Regards!

Answer:  Mass is 2,37 kg

Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.

m = W/g = 23.2 N /  9.81 m/s²

Answer: a

Explanation:

Answer:

12.7 L (3 s.f.)

Explanation:

Since it is an ideal gas, we can apply the ideal gas law:

[tex]\boxed{pV=nRT}[/tex]

☆ where p= pressure

V= volume

n= number of moles

R= ideal gas constant

T= temperature

Substitute all the given information into the formula:

2V= 1(0.08206)(310)

2V= 25.4386

V= 25.4386 ÷2

V= 12.7 L (3 s.f.)

Further explanation:

The ideal gas constant, R, has different values depending on what units are being used. Two examples are listed below:

[tex]• \: 0.08206 \: L \: atm ^{ - 1} \: mol \: K[/tex]

[tex]• \: 8.314 \: J \: {mol}^{ - 1} \: {K}^{ - 1} [/tex]

In the above question, we use the value 0.08206 because the pressure was given in atm and the temperature was given in Kelvin. Thus, the unit used for volume is L.

Answer: 12.7 L

Explanation:

P=2.0atm

V= ???

n=1.0 mol

R= 0.0821

T= 310K

PV=nRT--> (2)V=(1)(0.0821)(310)

                     V=12.7 L

Answer:

C) The molecules become separated from each other.

Explanation:

Answer:

D)Gases usually weigh less than solids.

Answer:

D) Gases usually weigh less than solids

Explanation:

Gases don't have weight and solids do which automatically makes gases lighter because they don't have a mass like a solid.

Answer:

O₂ is limiting reactant and 6.17g CO₂ can be produced

Explanation:

Based on the balanced reaction:

C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O

1 mole of C₈H₁₈ reacts with 25/2 moles O₂.

To solve this question we must convert the mass of each reactant to moles and, using the balanced reaction, we can find limiting reactant. With moles of limiting reactant we can find the moles of CO₂ and its mass as follows:

Moles C₈H₁₈ -Molar mass: 114.23g/mol-

2.28g * (1mol / 114.23g) = 0.0200 moles C₈H₁₈

Moles O₂ -Molar mass: 32g/mol-

7.00g * (1mol / 32g) = 0.219 moles O₂

For a complete reaction of 0.0200 moles C₈H₁₈ are needed:

0.0200 moles C₈H₁₈ * (25/2moles O₂ / 1mole C₈H₁₈) = 0.250 moles of O₂ are needed.

As there are just 0.219 moles, O₂ is limiting reactant.

Moles of CO₂ that can be produced:

0.219 moles O₂ * (8moles CO₂ / 25/2moles O₂) = 0.140 moles CO₂

The mass is -Molar mass CO₂: 44.01g/mol-:

0.140 moles CO₂ * (44.01g / mol) =

Answer:

47.6°C is the change of temperature

Explanation:

To solve this question we must use the equation of specific heat of a material:

Q = m*ΔT*S

Where Q is heat applied = 90J

m is the mass of the substance = 15g gold

ΔT is change in temperature = Our incognite

S is specific heat of the material = 0.126J/g°C for gold

Replacing:

90J = 15g*ΔT*0.126J/g°C

90J/15g*0.126J/g°C = ΔT

ΔT = 47.6°C is the change of temperature

Answer for a apple it would be happle

xplanation:

Answer:

Assertion (A) is true

but reason (R) is false.

Explanation:

If we look at the assertion closely, it is true that a sublime substance changes from solid to gas without  passing through a liquid state. Naphthalene, camphor, iodine and ammonium  chloride are some common  examples of the substances  which undergo sublimation.

However, not all solids first pass through a liquid state before converting to gas. Sublime solids such as those listed above passes directly from solid to gas without passing through a liquid state.

Hence the assertion is true but reason is false.

Explanation:

(Gases and liquids )

is the answer

Gases and liquids are the states of matter that have the same volume when moved.

Hope it helps you

Answer:

False

Explanation:

Cows and other livestock release methane, which is a gas like Carbon Dioxide, but not the same thing, even though it does contribute into Carbon Dioxide.

Answer:

20

Explanation:

not sure please correct me if im wrong

Answer:

20

Explanation:

Got it right on time 4 learning

Answer:

If you have genetic variation then a community is more likely to survive because the population is more likely to have individuals who are fine if there are environmental changes. Then natural selection will happen and the species will evolve to he adapted to the new environment. If everyone in a population has the same genetics, than one thing could take them all out.

Answer:

The answer would have to be public education on the importance of washing hands.

Explanation: Washing hands is always one of the best ways to prevent a contagious disease.

Answer:

10.3 mol Ga(ClO₃)₃

Explanation:

Let's consider the following balanced thermochemical equation.

2 Ga(ClO₃)₃(s) ⇒ 2 GaCl₃(s) + 9 O₂(s)  ΔH = - 130.4 kJ

According to the balanced thermochemical equation, 130.4 kJ of heat are released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:

674 kJ × 2 mol Ga(ClO₃)₃/130.4 kJ = 10.3 mol Ga(ClO₃)₃

Thermochemical equations are chemically balanced equations that take into account both the energy change and the physical states of all reactants and products. Energy is a reactant in an endothermic process, whereas it is a product in an exothermic reaction. Here the moles of Ga(ClO₃)₃ is  10.3 mol.

Let's consider the following balanced thermochemical equation.

2Ga(ClO₃)₃(s) ⇒ 2GaCl₃(s) + 9O₂(s)  ΔH = - 130.4 kJ

According to the balanced thermochemical equation, 130.4 kJ of heat is released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:

674 kJ × 2 mol Ga(ClO₃)₃ / 130.4 kJ = 10.3 mol Ga(ClO₃)₃

To know more about thermochemical equation, visit;

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Answer:

19.3

Explanation:

V=4^3 a^3,  to find volume with sides

p= 1235/64, Mass/ Volume= Density

Option D : Strong bonds in reactant molecules

The strong bonds in reactant molecules sometimes needs extra energy to weaken the bond and proceed the reaction. Hence, option D is correct.

The rate of a reaction is the rate of decrease in concentration of the reactants or decrease in concentration of the reactants or increase in the concentration of the products.

The minimum energy required to overcome the barrier potential of a reaction is called its activation energy. Hence, lower the activation energy higher will be the reaction rate.

High temperature and presence of catalyst also leads to higher rate. Strong bonds in reactants needs higher energy to weaken the intermolecular force. Thus, slower the reaction rate.

Find more on reaction rate:

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Answer: Option C is correct

Grams solid x mol/g * A Hfusion

Explanation:

This is because from fusion is associated to melting and this is a process where solid particles or substances goes through transition phase and turn to liquid.

There for the stoichiometry is used to calculate energy absorbed when solid mass melt with the formula Grams solid x mol/g * A Hfusion.

Answer:

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Explanation:

Answer:

Clean a platinum or nichrome (a nickel-chromium alloy) wire by dipping it into concentrated hydrochloric acid and then holding it in a hot Bunsen flame. Repeat this until the wire produces no color in the flame.

The above reaction is a Single displacement reaction , in which lead (Pb) being more reactive displaces Copper (Cu) from its compound [tex](\mathrm{CuCl_2})[/tex] and forms Lead Chloride [tex](\mathrm{PbCl_2})[/tex].

[tex] \boxed{\mathrm{Pb + CuCl_2 \rightarrow PbCl_2 + Cu}}[/tex]

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[tex]\mathrm{ \#TeeNForeveR} \: ☃[/tex]

Answer:

C. 12.85

Explanation:

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