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Maksim231197 [3]
3 years ago
5

first used the term cell when he used a (5)_____ to observe box-like structures when he was examining cork under a microscope. (

6)_____ also saw what we know know as (7)_____ when looking at pond water. These observations, along with the observations of several other scientists over the course of 200 years, lead to the development of the (8)_____.
Chemistry
1 answer:
MrRa [10]3 years ago
3 0

Answer:

sorry if its wrong.

Explanation:

(5) a cell was used to refer to these tiny units of life

(6) Robert Hooke

(7)  cell walls

(8) modern cell theory. im so sorry if im wrong.

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1) Describe the characteristics of molecular compounds that affect their particular physical
Nitella [24]

The types of intermolecular forces that occur in a substance will affect its physical properties, such as its phase, melting point and boiling point.
8 0
3 years ago
The empirical formula for a compound is C2H4NO. If its molar mass is 232.2 g/mol, what is the molecular formula of the compound?
Irina18 [472]

Empirical formula mass

  • C2H4NO
  • 2(12)+4(1)+14+16
  • 30+24+4
  • 58g/mol

Molar mass=232.2g/mol

Find n

  • Molar mass/Empirical formula mass
  • 232.2/58
  • 4

Molecular formula

  • n×Empirical formula
  • 4(C2H4NO)
  • C8H16(NO)_4
4 0
2 years ago
Limestone has a density of 2.72 g/cm3. What is the mass of 8.92 cm3 of limestone?
timurjin [86]
It should be 24.2624 because if there’s 2.72g in every cm3 and there are 8.92 cm3, then you simply multiply the two numbers
hope this helped :)
8 0
3 years ago
Read 2 more answers
At − 12.0 ∘ C , a common temperature for household freezers, what is the maximum mass of sorbitol (C6H14O6) you can add to 2.00
allochka39001 [22]

Answer:

2,347.8 grams

Explanation:

The freezing point depression Kf of water = 1.86° C / molal.

 

To still freeze at -12° C, then the molality of the solution 12/ 1.86 = 6.45 moles

 

The molecular weight of sorbitol (C6H14O6)is:

 

6 C = 6 ×12 = 72

14 H = 14 × 1 = 14

6 O = 6 × 16 = 96

...giving a total of 182

 So one mole of sorbitol has a mass of 182 grams.

 

Since there are 2 kg of water,  2 × 6.45 moles = 12.9 moles can be added to the water to get the 12° C freezing point depression. 

Therefore

grams = moles × molar mass

12.9 moles × 182 grams / mole = 2,347.8 grams of sorbitol can be added and still freeze

7 0
4 years ago
Explain why the electron configuration of 2-3-1 represents an atom in an excited state?
baherus [9]

Answer:

See explanation

Explanation:

If we look at the electron configuration closely, we will discover that the element must have had a ground state electron configuration of 2,4.

This is because, the innermost shell usually holds two electrons while the outer shells hold eight electrons each. The four electrons must be accommodated in the second shell in the ground state configuration of the compound.

However, when the atom is excited, one electron from this shell may move to the third shell to give the excited state configuration 2-3-1 as shown in the question.

6 0
3 years ago
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