1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
frosja888 [35]
2 years ago
11

Cell membranes are selectively permeable. This means that A. only water can move freely across the cell membrane. B. any substan

ce can move across the cell membrane, but chemical energy will always be required. C. some substances can move freely across the cell membrane, while others must be transported. D. no substances can move freely across the cell membrane.
Chemistry
1 answer:
MaRussiya [10]2 years ago
6 0

Answer:

C. some substances can move freely across the cell membrane, while others must be transported.

Explanation:

You might be interested in
In laboratory, your TA makes a statement about the toxicity of the fumes of a reaction. What does the term toxicity mean?
grandymaker [24]

Answer:

A.

Explanation:

A toxic substance is a substance that can cause some harmful effects when a person is exposed to it. The sum of all adverse effects is called the toxicity of a substance. As higher is the toxicity, as dangerous is the substance. The effects can be observed in the mouth, the eyes, the skin, the tract respiratory, the brain, etc.

A substance or agent that can interfere with normal embryonic development is called teratogenic.

A substance or agent capable of causing or producing cancer in mammals is called carcinogenic.

The dose found to be lethal in 50 percent of a group of test animals when administered by the specified route is called LD50 (Lethal Dose 50).

4 0
3 years ago
Pls helpppppppp!!!!!!!
aniked [119]

Answer:

a:  k2 02

Explanation:

8 0
2 years ago
HClO4 acid solution has a concentration of 5 Molarity. Calculate the concentration of this solution in
Nutka1998 [239]

Answer:

1. Percentage by weight = 0.5023 = 50.23 %

2. molar fraction =0.153

Explanation:

We know that

Molar mass of HClO4 = 100.46 g/mol

So the mass of 5 Moles= 5 x 100.46

       Mass (m)= 5 x 100.46 = 502.3 g

Lets assume that aqueous solution of HClO4  and the density of solution is equal to density of water.

Given that concentration HClO4 is 5 M it means that it have 5 moles of HClO4 in 1000 ml.

We know that

Mass = density x volume

Mass of 1000 ml  solution = 1 x 1000 =1000     ( density = 1 gm/ml)

            m'=1000 g

1.

Percentage by weight = 502.3 /1000

Percentage by weight = 0.5023 = 50.23 %

2.

We know that

molar mass of water = 18 g/mol

mass of water in 1000 ml = 1000 - 502.3 g=497.9 g

So moles of water = 497.7 /18 mole

moles of water = 27.65 moles

So molar fraction = 5/(5+27.65)

molar fraction =0.153

6 0
3 years ago
Canany one heelp me plzzzzzzz
Westkost [7]

Answer:

She should take one

Explanation:

because it is the closest option to 1.04 and if you dont have the right dosage then you always want to take the smaller dose as opose to a bigger dose

5 0
3 years ago
Read 2 more answers
5. What is another name for Newton’s first law in your own words.
krek1111 [17]
Newton’s first law states that motion stays the same throughout unless changed such as a football being placed on the ground and not moving it stays at rest and the football being thrown stays in motion unless changed by direction.
5 0
3 years ago
Other questions:
  • Early scientists think that plate motion was driven by
    6·1 answer
  • What is the difference between alectronegativity and ioniztion energy
    8·1 answer
  • What could you do to change the volume of a gas?
    5·2 answers
  • Consider three identical flasks filled with different gases. Flask A: CO at 760 torr and 08C Flask B: N2 at 250 torr and 08C Fla
    14·1 answer
  • CS3PO4 + Na2SO4 → Na3PO4 + Cs2SO4​
    15·1 answer
  • John's class is doing an experiment that involves mice. The mice are kept in a large, clean cage, and John gives them water and
    14·1 answer
  • 1 point
    5·1 answer
  • Which of these are correct
    9·1 answer
  • a model of an atom shows eight electrons in rings that represent different energy levels. how many electrons are in each energy
    15·1 answer
  • In the United States, the primary agents of socialization include
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!