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AleksandrR [38]
3 years ago
14

Krusty Krabs Breath Mints Mr. Krabs created a secret ingredient for a breath mint that he thinks will “cure” the bad breath peop

le get from eating crabby patties at the Krusty Krab. He asked 100 customers with a history of bad breath to try his new breath mint. He had fifty customers (Group A) eat a breath mint after they finished eating a crabby patty. The other fifty (Group B) also received a breath mint after they finished the sandwich; however, it was just a regular breath mint and did not have the secret ingredient. Both groups were told that they were getting the breath mint that would cure their bad breath. Two hours after eating the crabby patties, thirty customers in Group A and ten customers in Group B reported having better breath than they normally had after eating crabby patties.
Identify the control "group" (C), the independent variable (IV), and the dependent variable (DV) in your answer.
Chemistry
1 answer:
Liula [17]3 years ago
7 0
He sponge bob. Kristin craf
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1. The actual yield of a product in a reaction was measured as 1.20 g. If the theoretical yield of the product for the reaction
n200080 [17]
<h3>1. <u>Answer;</u></h3>

Percentage yield = 65.9%

<h3><u>Explanation;</u></h3>
  • Percentage yield of a reaction is obtained by dividing the actual yield by theoretical yield and multiplying by 100 percent.

Therefore;

  • Percentage yield = Actual yield/theoretical yield × 100%

                                      = (1.20 g/1.82 g) × 100%

                                      =  65.9%

<h3 /><h3>2. <u>Answer;</u></h3>

The amount of measured yield over calculated yield

<h3>Explanation;</h3>
  • Percentage yield of a reaction is obtained by dividing the actual yield by theoretical yield and multiplying by 100 percent.
  • The actual yield is the actual amount produced when the experiment or reaction is carried out.
  • Theoretical yield is the calculated or expected amount of the product. It is based on the limiting reactant.

<h3>3. <u>Answer</u>;</h3>

= 37.71 g

<h3><u>Explanation;</u></h3>

The balanced equation is:

2 Na + Cl₂ → 2 NaCl.

From the balanced equation:

2.0 moles of Na reacts with 1.0 mole of chlorine gas to give 2.0 moles of NaCl.

  • The number of moles of Na = mass/atomic mass),

                                                    n = (17.25 g / 22.989 g/mole of Na)

                                                         = 0.75 moles

Thus;

  • Using cross multiplication and from the equation:

                         2.0 moles of Na → 2.0 moles of NaCl

                         0.75 moles  of Na → 0.75 moles of NaCl

Therefore;

  • The mass of the produced NaCl (m = n x molar mass)

                    m = (0.75 mole x 58.443 g/mole of NaCl)

                         = 43.85 g.

  • This is the yield if the percentage of yield is 100%, but the percentage yield of the reaction is 86%.

Hence;

The actual yield = (43.85 g) (86/100)

                            = 37.71 g.

<h3>4. <u>Answer;</u></h3>

Oxygen and hydrogen molecules will mix because of random movement of their molecules.

<h3><u>Explanation;</u></h3>
  • Both gasses will diffuse into the other jar until the molecules are well distributed into both containers.
  • Diffusion is the movement of molecules from a point of high concentration to areas of low concentration until equilibrium is attained.  
  • The mixture of gases will have a partial pressure that is equal to the sum of the partial pressures of the component gases.
5 0
3 years ago
True or false : rocks have different properties such as hardness and texture
harkovskaia [24]

Answer:

true

Explanation:

Rocks have different properties such as hardness and texture

Metamorphic rocks form when heat and pressure cause sedimentary or igneous rocks to recrystallize into new rock.  

Soil is made up of dirt with decomposed organic material

6 0
4 years ago
Read 2 more answers
If a gas at 20.0 °C occupies 3.60 liters at a pressure of 1.00 atm, what will be its volume at a
slamgirl [31]

Answer:

1.44L

Explanation:

P1V1/T1=P2V2/T2

since the temperature didn’t change, stay at 20celsius, we can ignore T1 and T2.T1=T2

(1.00atm)(3.60L)=(2.50 atm)V2

V2=(1.00atm)(3.60L)/(2.50atm)

=1.44L

7 0
3 years ago
HELPPP!!! What is the volume of a 1.31 moles sample of gas if the pressure is 904 mmHg and the temperature is 37. degrees Celsiu
Tju [1.3M]

Answer:

27.99 dm³

Explanation:

Applying

PV = nRT................ Equation 1

Where P = Pressure, V = Volume, n = number of mole, R = molar gas constant, T = Temperature.

From the question, we were aksed to find V.

Therefore we make V the subject of the equation

V = nRT/P................ Equation 2

Given: n = 1.31 moles, T = 37°C = 310K, P = 904 mmHg = (904×0.001316) = 1.1897 atm

Constant: R = 0.082 atm.dm³/K.mol

Substitute these values into equation 2

V = (1.31×310×0.082)/(1.1897)

V = 27.99 dm³

4 0
3 years ago
How many moles are in 325mL of 1.25M (NH4)2SO4
mote1985 [20]

Answer:

n_{solute}=0.406mol(NH_4)_2SO_4

Explanation:

Hello,

In this case, since the molarity is defined as the ratio of the moles of the solute to the volume of the solution in liters:

M=\frac{n_{solute}}{V_{solution}}

For the given volume and molarity, we solve for the moles of ammonium sulfate (solute) as shown below:

n_{solute}=M*V_{solution}=1.25\frac{mol}{L}*325mL*\frac{1L}{1000mL}  \\\\n_{solute}=0.406mol(NH_4)_2SO_4

Best regards.

4 0
4 years ago
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