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3 years ago

ANSWER MY QUESTION AND YOU WILL GET 30 POINTS !!!!!!!!

Chemistry

2 answers:

Tems11 [23]3 years ago

7 0

For the first statement, the independent variable is the the amount of light during studying, while the dependent variable is the test scores. In the second statement, the independent variable is the amount of sleep, while the dependent variable is the productivity.

zysi [14]3 years ago

3 0

Answer:

It's a lie cuz when you don't rest well enough you will not be able to learn well hence productivity will be low

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Which of the following statements is correct about the gases which participate in photosynthesis?

antoniya [11.8K]

First let's look at the photosynthesis equation:

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

We know that:

CO₂ is carbon dioxide
H₂O is water
C₆H₁₂O₆ is glucose
O₂ is oxygen

We also know that the left side of the reaction is the reactants (which gets used up), and the right side is what is produced.

Now, we can look at each of the choices to see which one matches the equation:

We can eliminate the last two choices automatically because there is no hydrogen atoms present on either side.
The second one is not correct because oxygen is a product, not a reactant.

Therefore, the answer is the first one because carbon dioxide is a reactant, and oxygen is a product.

8 0

3 years ago

Select all that apply. Catalysts can save money by essentially lowering the:

k0ka [10]

Answer: Options (a) and (d) are the correct answer.

Explanation:

A catalyst is the substance which helps in increasing the rate of reaction.

Activation energy is the minimum amount of energy required by reactants to start the reaction. On addition of catalyst, the path of reaction changes because the energy barrier gap reduces and hence, the activation energy also decreases.

In the absence of catalyst, we need to increase the temperature so that reaction can occur quickly.

Whereas on addition of catalyst, there is no need to increase the temperature as the catalyst itself is sufficient to increase the rate of reaction. As a result, temperature should be lowered when there is addition of catalyst in the reaction.

Thus, we can conclude that catalysts can save money by essentially lowering the activation energy and temperature required.

4 0

3 years ago

Read 2 more answers

Calculate the percent yield of benzyl alcohol Sue obtained when doing the following reaction. Sue started with 2.1 g of benzoic

Pachacha [2.7K]

Answer:

The percent yield is 116.6 %

Explanation:

Step 1: Data given

Mass of benzoic anhydride = 2.1 grams

Mass of sodium borohydride = 0.15 grams

Molar mass of benzoic anhydride = 226.23 g/mol

Molar mass of NaBH4 = 37.83 g/mol

Mass of benzyl alcohol produced = 0.5 grams

Step 2: The balanced equation

C14H10O3 + NaBH4 → C7H6O2 + C7H8O + NaB

Step 3: Calculate moles of C14H10O3

Moles C14H10O3 = Mass / molar mass

Moles C14H10O3 = 2.10 grams / 226.23 g/mol

Moles C14H10O3 = 0.00928 moles

Step 4: Calculate moles NaBH4

Moles NaBH4 = 0.150 grams / 37.83 g/mol

Moles NaBH4 = 0.00397 moles

Step 5: Calculate limiting reactant

For 1 mol of C14H10O3 we need 1 mol of NaBH4 to produce 1 mol of C7H8O

NaBH4 is the limiting reactant. It will completely be consumed ( 0.00397 moles).

C14H10O3 is in excess. There will react 0.00397 moles.

There will remain 0.00928 - 0.00397 = 0.00531 moles

Step 6: Calculate moles of C7H8O

For 1 mol of C14H10O3 we need 1 mol of NaBH4 to produce 1 mol of C7H8O

For 0.00397 of C14H10O3 we need 0.00397 mol of NaBH4 to produce 0.00397 mol of C7H8O

Step 7: Calculate mass of C7H8O

Mass of C7H8O = Moles * molar mass

Mass of C7H8O = 0.00397 moles * 108.14 g/mol

Mass of C7H8O = 0.429 grams = theoretical yield

Step 8: Calculate % yield

% yield = (actual yield/ theoretical yield) * 100%

% yield = 0.5/0.429) *100 %

% yield = 116.6 %

The percent yield is 116.6 %

3 0

4 years ago

10. What is the energy of x-radiation with a 1 x 10-m wavelength? Esho

luda_lava [24]

Answer:sorry no idea

Explanation:

4 0

3 years ago

1. Balance the following equations: (photo attached, just 1 a,b,&c)

koban [17]

Here are the answers

$\\ \tt\hookrightarrow HCl+NaOH\longrightarrow NaCl+H_2O$

Already balanced

$\\ \tt\hookrightarrow H_2SO_4+2NaOH\longrightarrow Na_2SO_4+2H_2O$

$\\ \tt\hookrightarrow 2HCl+Ba (OH)_2\longrightarrow BaCl_2+2H_2O$

7 0

2 years ago