CHEMISTRY HIGH SCHOOL

How does bias in the data affect experimental results?A. Bias makes the data harder to analyze.
B. Bias makes the results less reliable.
C. Bias makes the results easier to interpret.
D. Bias makes the results not publishable.

Answers

Answer 1
Answer:

Answer:

B

Explanation:

Bias may make one side look worse than they actually are.
Answer 2
Answer: If you have bias data result, then you can’t trust on your outcome to be 100% accurate. So, your answer is B.


Hope this helps :)

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Magnesium reacts with hydrochloric acid (HCl) as follows. mc025-1.jpg How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP? 0.448 mL 0.45 mL 448 mL 450 mL

Answers

Answer: 448 mL of hydrogen gas.

Solution:

Mg(s)+HCl(aq)\rightarrow MgCl_2(aq)_+H_2(g)

Now,according to reaction

1 mole of magnesium produces one mole of hydrogen gas.

Then 0.020 moles of magnesium will produce 0.020 moles of hydrogen gas.

Moles of H_ gas : 0.020 mol

At STP, 1 mol of gas occupies 22.4 L

So volume of 0.020 mol of H_2produced at STP :

= 22.4/times 0.020 = 0.448 L = 448 mL    (1L=1000mL)

Answer:

The answer is D 450

Explanation:

I just did the quiz

A substance releases heat when it changes froma. liquid to solid
b. solid to gas
c. liquid to gas
d. solid to liquid

Answers

The answer should be (A) liquid to solid. This is because it releases the heat absorbed by it when it had changed into liquid.

Answer:

its D

Explanation:

Where are alkaline earth metals found on the periodic table

Answers

The alkaline earth metals are in group two on the periodic table. They have 2 valence electrons. 

Answer:

They are in group 2

Explanation:

Cellulose and chitin are linked by what type of bond? A) Glycosidic bond B) Peptide bond C) Disulfide bond D) Hydrogen bond

Answers

Answer: The correct answer is: A) Glycosidic bond

Explanation: Cellulose and chitin are both complex carbohydrates made of repeating units of glucose. These repeating units are linked together by glycosidic bonds, specifically beta-glycosidic bonds, which are a type of covalent bond connecting the sugar molecules in a linear fashion.

A 10 L mixture is made up of 40% antifreeze. How much of the mixture needs to be removed and filled with pure antifreeze to reach a concentration of 60% antifreeze

Answers

Answer:

3.3 liters of the mixture is needed to be removed and filled with 3.33 liters pure antifreeze to reach a concentration of 60% antifreeze.

Explanation:

A 10 L mixture is made up of 40% antifreeze.

Initial Volume of antifreeze in 40% mixture = 40% of 10 L = 4L

Let volume of pure antifreeze added  = x

Volume of antifreeze removed = 40% of x= 0.4 x

Volume of antifreeze in 60% mixture = 60% of 10 L = 6 L

Volume of antifreeze left after removal of 0.4 x L of antifreeze and addition of x L of pure antifreeze will be equal to 6 L of antifreeze in the final solution.

4L  - (0.4 x ) + x = 6L

x = 3.33 L

3.3 liters of the mixture is needed to be removed and filled with 3.3 liter  pure antifreeze to reach a concentration of 60% antifreeze.

Which is the correct expression for Keq when the chemical reaction is as follows:N2 + 3H2 2NH3.

Answers

Answer : The expression for equilibrium constant will be,

K_(eq)=\fac{[NH_3]^2}{[N_2][H_2]^3}

Explanation :

Equilibrium constant : It is defined as the number of ratio of the concentration between the products and the reactants at equilibrium.

The equilibrium reaction is,

aX+bY\rightleftharpoons cW+dZ

The general expression for equilibrium constant will be,

K_(eq)=([X]^a[Y]^b)/([W]^c[Z]^d)

The given balanced chemical reaction will be,

N_2+3H_2\rightleftharpoons 2NH_3

The expression for equilibrium constant will be,

K_(eq)=([NH_3]^2)/([N_2][H_2]^3)
The expression of the Keq is [NH3]2/([N2][H2]3). The common formula of reaction: ax+by=cz is Keq - [z]c/([x]a*[y]b). Remember to use a balanced chemical reaction.
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