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olga2289 [7]
4 years ago
6

Why do plant cells have a cell wall in addition to a cell membrane?

Chemistry
1 answer:
garri49 [273]4 years ago
4 0

Answer:

The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress.

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Find the density of a piece of glass with a mass of 500g and a volume of 200cm3
kykrilka [37]
Density = mass/volume
D = 500 g /200 cm^3
D = 2.5 g/cm^3

hope this helps!
3 0
4 years ago
If 44.7 g of KCI (MM = 74.55 g/mol) are added to a 500.0 mL volumetric flask, and water is added to fill the flask, what is the
navik [9.2K]

1.199 M is the concentration of KCI in the resulting solution.

<h3 /><h3>What are moles?</h3>

A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

No.of moles of KCI

Moles = \frac{mass}{molar \;mass}

Moles = \frac{44.7 g}{74.5513 g/mol}

= 0.599 moles

Vol.of the solution,V= 500 ml

= 0.5 liter

Molarity

Molality = \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}

Molality = \frac{0.599 moles}{0.5 liter}

= 1.199 M

Hence, 1.199 M is the concentration of KCI in the resulting solution.

Learn more about moles here:

brainly.com/question/8455949

#SPJ1

6 0
3 years ago
When one metal mixes into the crystalline lattice of another it is called a(n)
ikadub [295]

Answer:

it would be an alloy

Explanation:

 It is a type of substance that is made by the melting of two or more elements together.

3 0
3 years ago
Read 2 more answers
How did the discovery of isotopes help to lead to a revised model of atomic structure?
Arte-miy333 [17]
Dalton postulated that atoms of the same elements had the same mass while atoms of different elements had different masses. 

The discovery of isotopes revealed that atoms of the same element did not necessarily have same masses, they could have different masses.

Therefore, the modern periodic table that we use nowadays contains the average atomic mass of all the isotopes found for a given element.
8 0
4 years ago
And ironic bonds what happens to electrons? No
iren [92.7K]

Answer:

metals donate electrons to nonsmetals

5 0
4 years ago
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