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Lerok [7]
2 years ago
13

Which of the following is a reason that a scientist would want to use a model to study DNA? A. DNA may not really exist

Chemistry
1 answer:
Otrada [13]2 years ago
7 0

I think it is D but i'm not sure

hope I helped :)

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2. The approximate concentration of hydrochloric acid, HCl, in the stomach (stomach
Sergio039 [100]

Answer:

a) 0.714g of bicarbonate of soda are required.

b) 0.221g of Al(OH)₃ are required

Explanation:

The reactions of HCl with bicarbonate of soda and aluminium hydroxide are:

HCl + NaHCO₃ → H₂O + NaCl + CO₂

3 HCl + Al(OH)₃ → 3H₂O + AlCl₃

The moles of HCl that we need neutralize are:

50mL = 0.050L * (0.17mol / L) = 0.0085 moles HCl

To solve these problem we need to find the moles of the antacid using the chemical reaction and its mass using its molar mass;

<em>a) </em><em>Moles NaHCO₃ = Moles HCl = 0.0085 moles </em>

The mass is -Molar mass NaHCO₃: -84g/mol-

0.0085 moles * (84g / mol) = 0.714g of bicarbonate of soda are required

b) 0.0085 moles HCl * (1mol Al(OH)₃ / 3mol HCl) = 2.83x10⁻³ moles Al(OH)₃

The mass is -Molar mass: 78g/mol-:

2.83x10⁻³ moles Al(OH)₃ * (78g/mol) =

<h3>0.221g of Al(OH)₃ are required</h3>
5 0
2 years ago
What elements are highlighted:<br> a. Nonmetals<br> b. Metals<br> C. Metalloids
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Non metals
(It’s both halogens and noble gases ) the other ones which are white(not highlighted) are alkali metals, alkaline earth metals, and transition metals :3
6 0
3 years ago
Recall all the models you described in task 1. Think about the results each model would predict for Thomson’s experiment. Which
Bumek [7]

Answer:

J.J. Thomson’s experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged “soup.”

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2 years ago
ATOMS WE LOVE ATOMS, answer this and get points , also thx for your help :)
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Answer:C because they have to I have the same mass before and after the equation.

Explanation:

HOPE THIS HELPED!! :) ;) <3<3

7 0
2 years ago
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What is the boiling point of water at sea level ??​
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Answer:

212 °F

Explanation:

4 0
3 years ago
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