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Studentka2010 [4]
3 years ago
5

What two structures would provide a positive identification of a plant cell under a microscope? a)cell wall, mitochondria b)plas

ma membrane, large central vacuole c)ribosomes, chloroplasts d)cell wall, chloroplast
Chemistry
2 answers:
lutik1710 [3]3 years ago
6 0

<h2>Answer:</h2>

The correct answer is option D which is cell wall, chloroplast.

<h3>Explanation:</h3>
  • Here positive identification means such features in plant cell which are significantly distinguishes plant cell from animals cells.
  • Cell wall is outer envelope type structure present around the cell membrane. It is not present in animal cells.
  • Chloroplasts are plasmids. These organelles are distinguished structure of photosynthesizing cells.
  • Hence only plant cells have chloroplast while chloroplast are absent i animal cells.
  • So from looking at chloroplast and cell wall we can identify a plant cell.
olga55 [171]3 years ago
3 0

Cell wall, Large central vacuole, Chloroplasts

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Fountain
iren2701 [21]

Answer:

4104 Coulombs

Explanation:

charge = time(sec) *current

25*60 =1500+20=1520

2.7A * 1520 sec =4104

4104 C

3 0
2 years ago
Pressure is the force exerted by a substance on its container. Of the three phases of matter which one would exert the highest p
Luden [163]

Answer:

Gaseous phase exert more pressure on container.

Explanation:

Pressure:

It is the force exerted by the substance on its container.

Mathematical expression:

P = F/A

P = pressure

F = force

A = area

We know that there are phases of matter solid liquid and gas.

Gases don't have definite volume and shape and take the shape and volume of container in which it present.  Molecule of gases randomly move everywhere and occupy all available space.  The molecules of gas randomly move collide with each other and also the wall of container their kinetic energy also increased because of this collision and pressure is produced

While in case of liquid molecules are packed and they can not move freely thus did not exert pressure like gaseous molecules.

In case of solids molecules are tightly packed and form more compact structure. They can not move thus did not exert pressure to the wall of container.

Properties of gases:

Molecule of gases randomly move everywhere and occupy all available space.

Gases don't have definite volume and shape and take the shape and volume of container in which it present.

Their densities are very low as compared to the liquid and solids.

Gas molecules are at long distance from each other therefore by applying pressure gases can be compressed.

The very weak inter molecular forces are present between gas molecules.

Properties of Liquid:

Liquid have definite volume but don,t have definite shape.

Their densities are high as compared to the gases but low as compared to the solids.

In liquid, molecules are close to each other and have greater inter molecular forces as compared to the gas molecules.

Properties of solids:

Solids have definite volume and shape.

In solids molecules are tightly pack and very close to each other.

Their melting and boiling point are every high.

The densities of solids are also very high as compared to the liquid and gas.

There are very strong inter molecular forces are present between solid molecules.

6 0
3 years ago
Why is the melting point of a network solid so high? How is this related to what a network solid is?
Alexxandr [17]
I believe that the answer to the question provided above is that molecules in solid are compact and are connected. It requires huge energy to move it, thus requires high temperature.
Hope my answer would be a great help for you.    If you have more questions feel free to ask here at Brainly.
4 0
3 years ago
What is the value of work done on an object when a 50–newton force moves it 15 meters in the same direction as the force?
victus00 [196]

Answer:

work done = 750 J

Explanation:

Given data:

Force on object = 50 N

Distance covered = 15 m

Work done = ?

Solution:

W = F. d

W = work done

F = force

d = distance

Now we will put the values in formula.

W = 50 N × 15 m

W = 750 N. m = 750 J

7 0
3 years ago
What does pressure measure
omeli [17]

Answer:

C

Explanation:

Pressure it says it in the name its the force of colliding particles

6 0
3 years ago
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