All categories

4 years ago

PPLLLZZZ HHEEEELLLPPPP

Chemistry

1 answer:

masya89 [10]4 years ago

5 0

Answer:

B) Cell Membrane

Explanation:

A) Chloroplasts are NOT in all cells, A is incorrect

C) Centrioles are for cell division, C is not correct

D) Cell walls are NOT in all cells, D is not correct

B) the cell membrane is responsible for materials traveling into and out of the cells to maintain homeostasis

You might be interested in

True or false, The universal gas constant, R, is . 0821 when we use mm Hg as our unit for pressure

ludmilkaskok [199]

Answer:

This is true.

Explanation:

R should be 0.0821

Good luck!

5 0

3 years ago

Calculate the pH for the following weak acid. A solution of HCOOH has 0.12M HCOOH at equilibrium. The Ka for HCOOH is 1.8×10−4.

Shtirlitz [24]

Answer:

the pH of HCOOH solution is 2.33

Explanation:

The ionization equation for the given acid is written as:

$HCOOH\leftrightarrow H^++HCOO^-$

Let's say the initial concentration of the acid is c and the change in concentration x.

Then, equilibrium concentration of acid = (c-x)

and the equilibrium concentration for each of the product would be x

Equilibrium expression for the above equation would be:

$\Ka= \frac{[H^+][HCOO^-]}{[HCOOH]}$

$1.8*10^-^4=\frac{x^2}{c-x}$

From given info, equilibrium concentration of the acid is 0.12

So, (c-x) = 0.12

hence,

$1.8*10^-^4=\frac{x^2}{0.12}$

Let's solve this for x. Multiply both sides by 0.12

$2.16*10^-^5=x^2$

taking square root to both sides:

$x=0.00465$

Now, we have got the concentration of $[H^+] .$

$[H^+] = 0.00465 M$

We know that, $pH=-log[H^+]$

pH = -log(0.00465)

pH = 2.33

Hence, the pH of HCOOH solution is 2.33.

7 0

3 years ago

Read 2 more answers

If Isaiah boiled 10 liters of water at 100°C, at which temperature would he boil 20 liters of water?

Brut [27]

SOMEONE ANSWER DA QUESTON

8 0

3 years ago

Ultrasound and Magnetic Resonance Imaging (MRI), are technologies used to create images of a patient's internal features. In man

Shtirlitz [24]

Its B. I got it right so do B.

6 0

3 years ago

A 10.0mL sample of a sugar solution has a mass of 5.0g. What is the density of the sugar solution?

Ludmilka [50]

Answer:

The answer to your question is: density = 0.5 g/ml

Explanation:

Data

Volume = 10 ml

mass = 5 g

Density = ?

Formula

density = mass / volume

Substitution

density = 5/ 10

density = 0.5 g/ml

3 0

3 years ago

PPLLLZZZ HHEEEELLLPPPP​

PPLLLZZZ HHEEEELLLPPPP