CHEMISTRY HIGH SCHOOL

What are some factors that might cause our percent yield to be greater than 100%? What are some factors that might cause it to be less than 100%? Make sure you discuss specific cases of how both might happen.

Answers

Answer 1
Answer: In the field of science, usually, the product of an experiment iscomputed ahead to understand if it reached a specific objective. It would reachgreater than 100% of percent yield if the factors include faster reaction rates;proper handling of the reactants, no outside contaminants, and the procedure ofthe experiment is followed smoothly. It would reach lesser than 100% percent yieldif the experiment is not followed, external factors such as contamination fromthe environment (wind, moisture, etc). 

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How many grams of KOH used to make 1.6 liters of 15% by mass solution with water as the solvent?

Answers

Given:

KOH used to make 1.6 liters of 15% by mass solution with water

 

Required:

grams of KOH

 

solution:

the density of KOH is equal to 2.12 kg/L

multiply  the known volume of KOH to the density and the percentage of KOH in water

mass of KOH = 1.6 L (2.12 kg/L)(0.15) = 22.61 grams of KOH

The shape of the nucleus is maintained byA. the nucleolus.

B. the nuclear lamina.

C. the nuclear envelope.

D. the endoplasmic reticulum.

Answers

B. the necular lamina

Why didn't scientists know about atoms for a long time

Answers

they didnt have a powerfull enough microscope to see them an when they could they were moving to fast unless they were cold

According to atomic theory: a. the nucleus is positively charged.
b. the nucleus contains both charged and uncharged particles.
c. the electrons contribute very little to the total mass of the atom.
d. the electrons are located in the atomic space outside the nucleus.
e. all of these

Answers

Answer:

e. all of these

Explanation:

Let us check all the given options one by one:

a.The nucleus is positively charged.

Yes it is correct since nucleus contain protons and neutrons and protons are positively charged.

b.The nucleus contains both charged and uncharged particles.

Yes because protons are positively charged and neutrons are neutral in nature.

c.The electrons contribute very little to the total mass of the atom.

Yes we know all the mass of the atom is considered in center and mass of electron is negligible as compared to protons and neutrons.

d.The electrons are located in the atomic space outside the nucleus.

Yes, its a known fact.

e. All of these.

Since , all given options are correct .

Therefore , option e. is right .

What is the combustibility of calcium?

Answers

the combustibility of calcium is relitivly high

It's relatively high

Which stage of grieving is actually a refusal to believe the event is occurring?A. denial
B. anger
C. bargaining
D. depression

Answers

That stage is the denial stage.
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