1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Darya [45]
3 years ago
5

How did robert hooke contribute to the cell theory?

Chemistry
1 answer:
frozen [14]3 years ago
4 0

Answer:

D - He was the first person to use the term Cells.

Explanation:

Hooke invented the first compound light microscope (not first microscope) and he examined a cork and saw that it was made up of thousands of empty pockets which he later called 'Cells'.

Hope it Helps! :D

You might be interested in
A force of 2,500 pounds drags a truck 30 feet in 1/2 minute.
scoray [572]
The right subject for this question is physics.

To calculate the work you use the formula:

Work = force * displacement

Work = 2500 pounds * 30 feet = 75,000 pounds - feet



To calculate the power you use the formula:

power = work / time

Power = 75,000 pound - feet / 30 seconds = 2300 pound-feet / second.
3 0
3 years ago
Calculate the freezing point of a solution containing 5. 0 grams of kcl and 550. 0 grams of water. the molal-freezing-point-depr
lutik1710 [3]

The freezing point of a solution containing 5. 0 grams of KCl and 550.0 grams of water is  - 0.45°C

Using the equation,

ΔT_{f} = iK_{f}m

where:

ΔT_{f} = change in freezing point (unknown)

i = Van't Hoff factor

K_{f} = freezing point depression constant

m = molal concentration of the solution

Molality is expressed as the number of moles of the solute per kilogram of the solvent.

Molal concentration is as follows;

MM KCl = 74.55 g/mol

molal concentration = \frac{5.0g*\frac{1mol}{74.55g} }{550.0g*\frac{1kg}{1000g} }

molal concentration = 0.1219m

Now, putting in the values to the equtaion ΔT_{f} = iK_{f}m we get,

ΔT_{f} = 2 × 1.86 × 0.1219

ΔT_{f} = 0.4536°C

So, ΔT_{f} of solution is,

ΔT_{f_{solution} } = 0.00°C - 0.45°C

ΔT_{f_{solution} } =  - 0.45°C

Therefore,freezing point of a solution containing 5. 0 grams of KCl and 550.0 grams of water is  - 0.45°C

Learn more about freezing point here;

brainly.com/question/3121416

#SPJ4

7 0
1 year ago
Please help (30 points)
aleksandrvk [35]

1) is chemical Bonds

3) Conservation of mass

5) compound

hope i helped on the ones i could answer

7 0
3 years ago
Read 2 more answers
Which determine the charge of an atom?
Andre45 [30]

Answer:

the answer is B its the number of protons and neutrons

8 0
3 years ago
The half-life of radon gas is approximately four days. Four weeks after the introduction of radon into a sealed room, the fracti
maksim [4K]

The fraction of the original amount remaining is closest to 1/128

<h3>Determination of the number of half-lives</h3>
  • Half-life (t½) = 4 days
  • Time (t) = 4 weeks = 4 × 7 = 28 days
  • Number of half-lives (n) =?

n = t / t½

n = 28 / 4

n = 7

<h3>How to determine the amount remaining </h3>
  • Original amount (N₀) = 100 g
  • Number of half-lives (n) = 7
  • Amount remaining (N)=?

N = N₀ / 2ⁿ

N = 100 / 2⁷

N = 0.78125 g

<h3>How to determine the fraction remaining </h3>
  • Original amount (N₀) = 100 g
  • Amount remaining (N)= 0.78125 g
  • Fraction remaining =?

Fraction remaining = N / N₀

Fraction remaining = 0.78125 / 100

Fraction remaining = 1/128

Learn more about half life:

brainly.com/question/26374513

7 0
2 years ago
Other questions:
  • True or false. Gas particles never touch each other. A. True; gas particles move too rapidly to ever touch. B. False; gas partic
    6·2 answers
  • Lord kelvin described the concept of absolute zero temperature and the laws relating the change in thermal energy during chemica
    12·1 answer
  • What happens when you regurgitate?
    9·1 answer
  • Find the density of an object that has a mass of 66g and a 10 cm3. HELP ASAP
    7·2 answers
  • - If I initially have a gas at a pressure of 379 mmHg, a volume of 467 mL, and a temperature of
    5·1 answer
  • Answer of all please
    6·1 answer
  • CHEMISTRY HELP!! due in 10 minutes! :(
    6·1 answer
  • How many moles of nitrogen are in 1 mole of Al(NO3)3?
    7·1 answer
  • ___ describes the forces that exist between liqiuds and different molecules
    10·1 answer
  • ) A technique once used by geologists to measure the density of a mineral is to mix two dense liquids in such proportions that t
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!