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3 years ago

What gives a pant cell a rigid shape?

Chemistry

1 answer:

pogonyaev3 years ago

5 0

Answer:

Cell Wall

Explanation:

In plant cells, the cell wall is rigid the outer structure that protects the plant cell.

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The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error

JulijaS [17]

Answer:

$1.35\times 10^{-4} M$ was the concentration of the original solution.

Explanation:

$M_1V_1=M_2V_2$ (Dilution)

where,

$M_1\text{ and }V_1$ are molarity and volume of non diluted sample.

$M_2\text{ and }V_2$ are molarity and volume of diluted sample.

$M_1=?$

$V_1=100.0 \mu L=0.1 mL$

(1μL=0.001 mL)

$M_2=6.41\times 10^{-6} M$

$V_2=2.00 mL + 100.0 \mu L=2.00 mL+0.1 mL=2.1 mL$

Substituting all values :

$M_1\times 0.1 mL=6.41\times 10^{-6} M\times 2.1 mL$

$M_1=\frac{6.41\times 10^{-6} M\times 2.1 mL}{0.1 mL}=1.35\times 10^{-4} M$

$1.35\times 10^{-4} M$ was the concentration of the original solution.

5 0

3 years ago

Ignore, question was removed

djverab [1.8K]

Rip bro but I need the point

6 0

3 years ago

How many total atoms of sulfur (s) are represented by the chemical formula 2so2? 1 2 4?

vekshin1

There are 6 atoms because so2, which is sulfur dioxide, has a total of 3 subscripts that is multiplied by 2 because of the coefficient in front of so2.

6 0

4 years ago

Using what you know about the periodic table, list some patterns that organize the elements in terms of atomic number, atomic ma

Sindrei [870]

Answer:

yes

Explanation:

yes they're very common.

5 0

3 years ago

What is the specific heat of an object that weighs 15 grams and changes temperature from 30°C to 37°C when 50 J of heat is added

Scorpion4ik [409]

Answer:

0.4762 J/g°C.

Explanation:

It is known that:

The amount of heat released to water = Q = m.c.ΔT.

where, m is the mass of water (m = 15.0 g).

c is the specific heat capacity of water = ??? J/g°C.

ΔT is the temperature difference = (final T - initial T = 37.0°C - 30.0°C = 7.0°C).

∴ The specific heat capacity of water = c = Q/m.ΔT = (50.0 J)/(15.0 g)(7.0°C) = 0.4762 J/g°C.

8 0

4 years ago