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2 years ago

Identify the independent /manipulated variable

Chemistry

1 answer:

fiasKO [112]2 years ago

7 0

Answer:

independent- test variable

manipulated - outcome variable; if needed, there could be changes.

Explanation:

knowledge

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Explain why animals that come out at night have lots of rods in their retina

sesenic [268]

Answer:

Nocturnal animals, such as owls, tend to have wide pupils and several rod cells in their retina because wide pupil allow more light to enter the eyes and the rods cells in the retina are sensitive to dim light and are vital for night vision.

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3 years ago

Radioactive isotopes of an atom are

nikdorinn [45]

Less stable should be the answer.as I think
I hope this helps you

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3 years ago

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Wine goes bad soon after opening because the ethanol (CH,CH,OH) in it reacts with oxygen gas (0.) from the air to form water (11

daser333 [38]

<u>Answer:</u> The mass of water produced is 1.8 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of ethanol = 4.59 g

Molar mass of ethanol = 46.07 g/mol

Putting values in equation 1, we get:

$\text{Moles of ethanol}=\frac{4.59g}{46.07g/mol}=0.0996mol$

The chemical equation for the reaction of ethanol with oxygen gas follows:

$CH_3CH_2OH+O_2\rightarrow CH_3COOH+H_2O$

By Stoichiometry of the reaction;

1 mole of ethanol produces 1 mole of water.

So, 0.0996 moles of ethanol will produce = $\frac{1}{1}\times 0.0996=0.0996mol$ of water.

Now, calculating the mass of water from equation 1, we get:

Molar mass of water = 18 g/mol

Moles of water = 0.0996 moles

Putting values in equation 1, we get:

$0.0996mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=(0.0996mol\times 18g/mol)=1.8g$

Hence, the mass of water produced is 1.8 grams

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2 years ago

Question 9 of 10

DanielleElmas [232]

Answer:

its d, forming a hypothesis is always one of the first things you do, and d is the best answer from these 4

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2 years ago

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A saturated solution of calcium hydroxide contains 1.85 g of solute in 100. mL of solution. What is its molarity

Leona [35]

Answer:

$M=0.250M$

Explanation:

Hello!

In this case, since the molarity of a solution is computed by dividing the moles of solute by the volume of solution in liters, we first need to compute the moles of solute knowing that the molar mass of calcium hydroxide is 74.1 g/mol as follows:

$n=1.85g*\frac{1mol}{74.1g}=0.0250mol$

Next, since the 100-mL solution is also expressed in liters by 0.100 L, we directly compute the molarity as shown below:

$M=\frac{0.0250mol}{0.100L}\\\\M=0.250M$

Which is expressed in molar units that are mol/L.

Best regards!

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3 years ago