Calculate the mass of KOH in a 35% solution that contains 58.5 g of water.

Answer:

255.51cm3

Explanation:

Data obtained from the question include:

V1 (initial volume) =?

T1 (initial temperature) = 50°C = 50 + 273 = 323K

T2 (final temperature) = - 5°C = - 5 + 237 = 268K

V2 (final volume) = 212cm3

Using the Charles' law equation V1/T1 = V2/T2, the initial volume of the gas can be obtained as follow:

V1/T1 = V2/T2

V1/323 = 212/268

Cross multiply to express in linear form

V1 x 268 = 323 x 212

Divide both side by 268

V1 = (323 x 212)/268

V1 = 255.51cm3

Therefore, the initial volume of the gas is 255.51cm3

Answer:

Explanation:

To get the initial volume of the hydrogen in cm³, we apply the equation generated from Charles' law.

V1/T1=V2/T2

Where;

V1=initial volume of gas

T1=initial temperature of gas

V2=final volume of gas

T2=final temperature of gas

We make V1 subject of formula

V1=(V2×T1)/T2

Given;

V2=212cm³

T1=50°C=(50+273)K=323K

T2=-5.0°C=(-5.0+273)K=268K

V1=(212×323)/268

V1=255.5cm³

Therefore, the initial volume of the hydrogen was 255.5cm³

Answer:

Option C. Kc = [CO2] / [C] [O2]

Explanation:

The balanced equation for the reaction is given below:

C(s) + O2(g) <===> CO2(g)

The equilibrium constant for a reaction is simply the ratio of the concentration of the products to the concentration of the reactants.

Thus, the expression for the equilibrium constant for the above equation is given by:

Kc = [CO2] / [C] [O2]

Answer:

The answer is A. a vector with magnitude and direction

Explanation:

If you're taking the Lesson 11: Motion & Forces Unit Review the answers are:

1. D. 325 kg · m/s

2. C. It is always the same as it was before the collision

3. C. It increases the time it takes for the person to stop

4. C. a 75kg dining table

5. B. The mass of the rocket decreases as fuel is burned, so the acceleration increases.

6. C. An increase in the distance between the objects causes a greater change in the gravitational force than the same increase in mass.

7. D. The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.

8. C. C

9. C. Surface 1 is blacktop, Surface 2 is gravel, and Surface 3 is ice.

10. B. using shaving cream, rather than shaving on dry skin

11. A. a vector with magnitude and direction

12. B. 10 N

13. B. There is a net force of 15 N allowing Levi and Clara to move the box.

14. D. Finley → Xander → Max

15. C. Carla slowed down in the beginning of her trip, stopped, and then sped up.

16. A. positive

17. B. His speed was 2 m/s, and his velocity was 0.

18. B. His speed was 2 m/s, and his velocity was 0.

19. A. the ocean surface

20. A. Atlanta

21. B. W

22. A. measurement and direction

**17 & 18 are the same question on the review

I just took the review so these are 100% correct :) (btw these are for Connexus... so yeah but I'm pretty sure they're all the same)

hope this helps :)

A force is a push or pull that can change the motion of an object. It has magnitude and direction, and there are different types of forces such as gravitational, frictional, and magnetic. Forces are measured in Newtons.

A force can be defined as a push or pull that can change the motion of an object. It is a vector quantity, which means it has both magnitude and direction. For example, when you push a book on a table, you exert a force on it that causes it to move.

There are different types of forces such as gravitational force, applied force, frictional force, and magnetic force. These forces can be measured using units like Newton (N) in the metric system. Understanding forces is essential in studying mechanics and how objects interact with each other.

In summary, a force is a physical interaction that causes a change in motion. It can be represented by vectors and is measured in units of Newtons.

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Answer:

There are two questions here;

1. How many moles of tungsten atoms are there in 9.6*10^25 atoms of bromine?

This question is invalid as it is quite impossible to obtain the number of moles of tungsten atoms in another element, bromine. The question would have been written as the number of moles of tungsten atoms in 9.6*10^25 atoms of tungsten or bromine as the case may be.

To solve for the number of moles of an atom; we should recur that

I mole of an atom = 6.02*10^23 atoms

6.02*10^23 atoms  = 1 mole

9.6*10^25 atoms =  (9.6 *10^25 / 6.02*10^23) moles

                           = 1.595 *10^2 moles

2. The reaction of 9 moles of O2 will produce -------- moles of H2O in the combustion reaction of propane.

C3H8 + 5O2 -------> 3CO2 + 4H2O

5 moles of O2 produces 4 moles of H2O

9 moles of O2 will produce (9 * 4/ 5) moles of H2O

                              = 7.2 moles of H2O

9moles of O2 will produce 7.2 moles of H2O.

Answer:

By contracting, muscles pull on bones and allow the body to move. ... For example, the biceps and triceps muscles work together to allow you to bend and straighten your elbow. When you want to bend your elbow, your biceps muscle contracts (Figure below), and, at the same time, the triceps muscle relaxes.

Explanation:

Answer:

When skeletal muscles contract, bones move. But how do muscles make your bones move? A voluntary muscle usually works across a joint. It is attached to both the bones on either side of the joint by strong cords called tendons. A tendon is a tough band of connective tissue that connects a muscle to a bone. Tendons are similar to ligaments, except that ligaments join bones to each other. Muscles move the body by contracting against the skeleton. When muscles contract, they get shorter. By contracting, muscles pull on bones and allow the body to move.

Muscles can only contract. They cannot actively extend, though they can move or relax back into the non-contracted neutral position. Therefore, to move bones in opposite directions, pairs of muscles must work in opposition. Each muscle in the pair works against the other to move bones at the joints of the body. The muscle that contracts to cause a joint to bend is called the flexor. The muscle that contracts to cause the joint to straighten is called the extensor. When one muscle is contracted, the other muscle from the pair is always elongated.

For example, the biceps and triceps muscles work together to allow you to bend and straighten your elbow. When you want to bend your elbow, your biceps muscle contracts (Figure below), and, at the same time, the triceps muscle relaxes. The biceps is the flexor, and the triceps is the extensor of your elbow joint. Other muscles that work together are the quadriceps and hamstrings used to bend and straighten the knee, and the pectorals and trapezius used to move the arms and shoulders forward and backward. During daily routines we do not use muscles equally. For example, we use our biceps more than our triceps due to lifting against gravity.

The biceps help contract the arm, while the triceps help extend the arm

The biceps and triceps act against one another to bend and straighten the elbow joint. To bend the elbow, the biceps contracts and the triceps relaxes. To straighten the elbow, the triceps contract and the biceps relax.

Hope this helps!

Answer:

20.446cm3

Explanation:

The following were obtained from the question given:

V1 (initial volume) = 24.568 cm3

T1 (initial temperature) = 25°C = 25 + 273 = 298K

T2 (final temperature) = - 25°C = - 25 + 273 = 248K

V2 (final volume) = ?

Since the pressure is constant, the gas is obeying Charles' law. With the Charles' law equation V1/T1 = V2/T2, we can easily calculate the final volume as follow:

V1/T1 = V2/T2

24.568/298 = V2/248

Cross multiply to express in linear form as shown below:

298 x V2 = 24.568 x 248

Divide both side by 298

V2 = (24.568 x 248) /298

V2 = 20.446cm3

From the calculations made above, the volume of the gas at -25°C is 20.446cm3

The initial temperature (T₁) was 263.0145 K.

Given Conditions:

Final volume (V₂) = 10.0 L

Final temperature (T₂) = 25.0°C = 298.15 K

Final pressure (P₂) = 1.00 atm

Initial volume (V₁) = 9.40 L

Initial pressure (P₁) = 0.939 atm

Using the Combined Gas Law:

[tex]\[ \dfrac{P_1 \times V_1}{T_1} = \dfrac{P_2 \times V_2}{T_2} \][/tex]

Rearrange to Solve for T₁:

[tex]\[ T_1 = \dfrac{P_1 \times V_1 \times T_2}{P_2 \times V_2} \][/tex]

Plugging in the Values:

[tex]\[ T_1 = \dfrac{0.939 \, \text{atm} \times 9.40 \, \text{L} \times 298.15 \, \text{K}}{1.00 \, \text{atm} \times 10.0 \, \text{L}} \][/tex]

Calculate T₁:

[tex]\[ T_1= \dfrac{2630.145}{10} = 263.0145 \, \text{K} \][/tex]

Answer:

Partial pressure O₂ = 1.49 atm

Explanation:

We can solve this, by the mole fraction concept.

Mole fraction = Moles of gas / Total moles

We can also define mole fraction as: Partial pressure of a gas / Total pressure

Total moles = Moles of O₂ + Moles of N₂

36.5 g. 1 mol / 32g + 46.4 g . 1mol /28g = 2.79 moles

1.14 moles O₂ + 1.65 moles N₂ = 2.79 moles

Partial pressure O₂ / Total pressure = Moles of O₂ / Total moles

Partial pressure O₂ = (Moles of O₂ / Total moles) . Total pressure.

We replace: (1.14 mol / 2.79 mol) . 3.64 atm = 1.49 atm

Partial pressure O₂ = 1.49 atm

Answer:

Explanation:

stoichiometry is used in cooking because it helps you determine the amount or proportion of compounds you will need in a chemical reaction. Stoichiometry is present in daily life, even in the cooking recipes we make at home. The reactions depend on the compounds involved and how much of each compound is needed to determine the product that will result.

Answer:

C)No; the rate law must be determined experimentally.

Explanation:

Rate Laws are empirical relationships defining rates of reaction. For any given reaction The Empirical Rate Law is the product of the concentration of the reactants raised to the power of their order of reaction. That is, for the hypothetical reaction aA + bB => Products its Empirical Rate Law is ...

Rate = k[A]ᵃ[B]ᵇ where k = the rate constant and a & b are orders of reaction.

Order of reaction is a 'rate trend' when one changes a rate factor such as concentration. This can only be determined by experimental observation by physically increasing or decreasing concentration and observing the change in reaction rate relative to a reference reaction of interest. Typically they are whole numbers but can be decimal fractions.  

By graphing experimental outcomes of Rxn Rate vs Change in Concentration one can define the order of reaction. Observations  give ...

0-order reactions => change concentration => no change in rate

1st order reactions => change concentration => proportional linear change in rate

2nd order reactions => change concentration => exponential change in rate.        

Answer:

The answer is C

Explanation:

I had the question on edg

FOLLOW ME FOR CLEARING YOUR NEXT DOUBT

Answer:

coastal flooding

Explanation:

Answer:

Increased heat, drought and insect outbreaks, all linked to climate change, have increased wildfires. Declining water supplies, reduced agricultural yields, health impacts in cities due to heat, and flooding and erosion in coastal areas are additional concerns.

Explanation:

Answer:

A cell grows to its full size, The cell copies its DNA

Explanation:

I just did that question

During interphase, a cell grows to its full size and it copies its DNA. Division of the cytoplasm, nuclear division, and formation of two identical cells occur later in the cell cycle, not during interphase.

The events that occur during interphase, which is a phase in the cell cycle, include the following:

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202.50 ml is the maximum volume of 0.240 M HCl that can be added to the buffer before its buffering capacity is lost.

Explanation:

Data given:

volume of buffer = 135 ml or 0.135 litres

molarity of the buffer = 0.360  M

volume of the acid = ?

molarity of the acid = 0.24 M

the number of moles of conjugate base is

M X V = number of moles

0.360 X 0.135

0.0486 moles of conjugate base

The maximum amount of acid added will equal the amount of conjugate base from the buffer.

So, the volume of acid will be calculated by using the formula:

Molarity = [tex]\frac{number of moles}{volume}[/tex]

 volume = [tex]\frac{0.0486}{0.24}[/tex]

              = 0.2025 l

202.50 ml is the volume of acid added.

Answer:

The mass of cryolite will be produced = 71247 g or, 71.247 kg

Explanation:

The balanced chemical equation for the synthesis of cryolite

        Al₂O₃(s) + 6 NaOH(l) + 12 HF(g) → 2 Na₃AlF₆ + 9 H₂O(g)

Answer: the answers is A) The CaCI2 beaker has more ions in solution.

Explanation:

The CaCl2 beaker has more ions in solution. Therefore, the correct option is option A among all the given option.

An atom or molecule is said to be an ion if one or more of its electrons in the valence state have been gained or lost, giving it a net positive and negative electrical charge. In other terms, a chemical species has an unbalanced quantity of protons compared to electrons.

Monatomic ions are defined as those made up of just one atom. The hydrogen ion H+ serves as an illustration. Polyatomic ions, also known as molecular ions, on the other hand, are made up of two or more atoms. 1 mole of NaCl is dissolved in a 1000 grams of water and 1 mol CaCl[tex]_2[/tex] is dissolved in a second beaker containing 1000 grams of water. The CaCl2 beaker has more ions in solution.

Therefore, the correct option is option A.

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Answer:

The volume of the gas when  pressure decreases to 620 mmHg is 2.52 L

Explanation:

Boyle's law is a law related to gases that establish a relationship between the pressure and the volume of a given amount of gas, without variations in temperature, that is, at constant temperature. So, this law establishes that at constant temperature, the volume of a fixed mass of gas is inversely proportional to the pressure it exerts.

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

o P * V = k

Having a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment, if you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be true:

P1 * V1 = P2 * V2

In this case:

Replacing:

780 mmHg* 2 L= 620 mmHg* V2

Solving:

[tex]V2=\frac{780 mmHg* 2L}{620 mmHg}[/tex]

V2= 2.52 L

The volume of the gas when  pressure decreases to 620 mmHg is 2.52 L

Answer:

2.52 L

Explanation:

Step 1:

The following data were obtained from the question:

Initial pressure (P1) = 780 mmHg

Initial volume (V1) = 2.0 L.

Final pressure (P2) = 620 mmHg.

Final volume (V2) =?

Step 2:

Determination of the final volume of the gas.

From the question given, we discovered that the temperature is constant. Since the temperature is constant, the gas is simply obeying Boyle's law.

Applying the Boyle's law equation, the final volume of the gas can be obtained as follow:

P1V1 = P2V2

780 x 2 = 620 x V2

Divide both side by 620

V2 = (780 x 2) /620

V2 = 2.52 L

Therefore, the volume of the gas when the pressure decreases to 620 mmHg is 2.52 L

Answer:

Shivering.

Explanation:

Homeostasis is the bodies need to keep things at a normal. When you are cold you shiver to produce body heat and get back to normal  

Answer:

Explanation:

[tex]C_{2}H_{4}O_{2}+2O_{2}[/tex] → [tex]2CO_{2}+2H_{2}O[/tex]

The balanced chemical equation is C₂H₄O₂ + (3/2)O₂ → 2CO₂ + 2H₂O.

A balanced chemical equation is an equation that represents a chemical reaction with an equal number of atoms of each element on both sides of the equation. It follows the law of conservation of mass, which states that matter cannot be created or destroyed during a chemical reaction.

In a balanced chemical equation, the coefficients are used to adjust the number of molecules or atoms involved in the reaction. Balancing chemical equations is essential for accurately representing the stoichiometry of a reaction and understanding the ratios of reactants and products involved.

Learn more about chemical equations, here:

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Answer:

B

Explanation:

GOOD LUCK!!!

Answer:

C. ΔG is positive at low temperatures, but negative at high temperatures (and zero at some temperature).

Explanation:

Since we need to give energy in the form of heat to vaporize a liquid, the enthalpy is positive. In a gas, molecules are more separated than in a liquid, therefore the entropy is positive as well.

Considering the Gibbs free energy equation:

ΔG= ΔH - TΔS

          +        +

When both the enthalpy and entropy are positive, the reaction proceeds spontaneously (ΔG is negative) at high temperatures. At low temperatures, the reaction is spontaneous in the reverse direction (ΔG is positive).

Answer:

Check all of them

Explanation:

All are correct.

- stong electrolytes dissolve completely

- weak disolve partially

- nonelectrolytes do not dissolve

Answer:

Explanation:

Answer:

91.64L

Explanation:

Step 1:

Data obtained from the question.

This includes the following:

Initial volume (V1) = 43L

Initial pressure (P1) = 1.3 atm

Final volume (V2) =..?

Final pressure (P2) = 0.61 atm

Step 2:

Determination of the final volume.

To solve for the final volume, we'll apply the Boyle's law equation since the temperature is constant. The final volume is obtained as follow:

P1V1 = P2V2

1.3 x 43 = 0.61 x V2

Divide both side by 0.61

V2 = (1.3 x 43)/0.61

V2 = 91.64L

Therefore, the new volume is 91.64L

The volume will be 91.64 L when the pressure is 0.61 atm

From Boyle's law equation, we have that

P₁V₁ = P₂V₂

Where P₁ is the initial pressure

V₁ is the initial volume

P₂ is the final pressure

and V₂ is the final volume

From the given information

P₁ = 1.3 atm

V₁ = 43 L

P₂ = 0.61 atm

V₂ = ?

Putting the parameters into the formula, we get

1.3 × 43 = 0.61 × V₂

∴ [tex]V_{2} = \frac{1.3 \times 43}{0.61}[/tex]

V₂ = 91.64 L

Hence, when the pressure is 0.61 atm, the volume will be 91.64 L

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Answer:

The answer to your question is   P2 = 2676.6 kPa

Explanation:

Data

Volume 1 = V1 = 12.8 L                        Volume 2 = V2 = 855 ml

Temperature 1 = T1 = -108°C               Temperature 2 = 22°C

Pressure 1 = P1 = 100 kPa                    Pressure 2 = P2 =  ?

Process

- To solve this problem use the Combined gas law.

                     P1V1/T1 = P2V2/T2

-Solve for P2

                     P2 = P1V1T2 / T1V2

- Convert temperature to °K

T1 = -108 + 273 = 165°K

T2 = 22 + 273 = 295°K

- Convert volume 2 to liters

                       1000 ml -------------------- 1 l

                         855 ml --------------------  x

                         x = (855 x 1) / 1000

                         x = 0.855 l

-Substitution

                    P2 = (12.8 x 100 x 295) / (165 x 0.855)

-Simplification

                    P2 = 377600 / 141.075

-Result

                   P2 = 2676.6 kPa

Answer:

The water vapor in the air releases energy to the cold water in the glass causing

the vapor to become liquid that collects on the sides of the glass.

Explanation:

Matter exist in solid, liquid and gaseous states. The energy of particles constituting each state of matter differs. In the gaseous state, the particles that compose matter are highly energetic and move at high speeds. Liquid particles possess lower energy and solid particles are the least energetic.

When water vapour in air comes in contact with a cold glass of water, heat exchange occurs. The energetic gas particles of water vapour looses energy to the cold water particles. This causes the water vapour outside the glass to condense to liquid and collects outside the glass.

The best explanation for water droplets collecting on the outside of a cold glass of water on a hot summer day is: Option (1.)The water vapor in the air releases energy to the cold water in the glass causing the vapor to become liquid that collects on the sides of the glass.

This process is called condensation.

On a hot day, the air is typically humid, meaning it contains a significant amount of water vapor. When the humid air comes into contact with the cold surface of the glass, the temperature of the air near the glass drops. If this temperature drops below the dew point (the temperature at which air becomes saturated with moisture), the water vapor in the air condenses into liquid water. This is because the cold surface of the glass absorbs heat from the water vapor, causing the vapor to lose energy and change from a gaseous state to a liquid state, forming droplets on the outside of the glass.

Answer:

72.028g

Explanation:

Data obtained from the question. This includes:

Volume (V) = 25.7 L

Temperature (T) = –22.2°C

Pressure (P) = 997 mmHg

Mass of CO2 =..?

Mass of CO2 can be obtained as follow:

Step 1:

Conversion to appropriate unit:

It is important to express each variables in their appropriate units in order to obtain the desired result in the right unit.

For temperature:

We shall be converting from celsius to Kelvin. This is illustrated below:

Temperature (Kelvin) = temperature (celsius) + 263

temperature (celsius) = –22.2°C

Temperature (Kelvin) = –22.2°C + 263

Temperature (Kelvin) = 250.8K

For Pressure:

We shall be converting from mmHg to atm. This is illustrated below:

760mmHg = 1 atm

Therefore, 997 mmHg = 997/760 = 1.31 atm

Step 2:

Determination of the number of mole of CO2.

With the ideal gas equation, we can obtain the number of mole of CO2 as follow:

Volume (V) = 25.7 L

Temperature (T) = 250.8K

Pressure (P) = 1.31 atm

Gas constant (R) = 0.082atm.L/Kmol

Number of mole (n) =...?

PV = nRT

n = PV/RT

n = (1.31 x 25.7)/(0.082 x 250.8)

n = 1.637 mole

Step 3:

Converting 1.637 mole of CO2 to grams. This is illustrated below:

Number of mole of CO2 = 1.637 mole

Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol

Mass of CO2 =...?

Mass = number of mole x molar Mass

Mass of CO2 = 1.637 x 44

Mass of CO2 = 72.028g.

Answer :  The wavelength of yellow light produced by a sodium lamp is, [tex]8.98\times 10^{-7}m[/tex]

Explanation : Given,

Frequency of radiation = [tex]3.34\times 10^{14}Hz=3.34\times 10^{14}s^{-1}[/tex]

conversion used : [tex]Hz=s^{-1}[/tex]

Formula used :

[tex]\nu=\frac{c}{\lambda}[/tex]

where,

[tex]\nu[/tex] = frequency of radiation

[tex]\lambda[/tex] = wavelength of radiation

c = speed of light = [tex]3\times 10^8m/s[/tex]

Now put all the given values in the above formula, we get:

[tex]3.34\times 10^{14}s^{-1}=\frac{3\times 10^8m/s}{\lambda}[/tex]

[tex]\lambda=8.98\times 10^{-7}m[/tex]

Therefore, the wavelength of yellow light produced by a sodium lamp is, [tex]8.98\times 10^{-7}m[/tex]

Answer:2.Sulfur?3.Neptune4.outer

Explanation:

Once upon a time there was a lovely

                        princess. But she had an enchantment

                        upon her of a fearful sort which could

                        only be broken by love's first kiss.

                        She was locked away in a castle guarded

                        by a terrible fire-breathing dragon.

                        Many brave knights had attempted to

                        free her from this dreadful prison,

                        but non prevailed. She waited in the

                        dragon's keep in the highest room of

                        the tallest tower for her true love

                        and true love's first kiss. (laughs)

                        Like that's ever gonna happen. What

                        a load of - (toilet flush)

              Allstar - by Smashmouth begins to play. Shrek goes about his

              day. While in a nearby town, the villagers get together to go

              after the ogre.