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bekas [8.4K]
3 years ago
9

Use the term selectively permeable in a sentence

Chemistry
1 answer:
atroni [7]3 years ago
8 0
Selectively Permeable means that some things can move across the cell membrane while others cannot.  
Here is a sentence: Because of the selectively permeable membrane, the germs were kept out while the food went in.
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What color do acids turn litmus paper?
Ivanshal [37]

Answer:

red

Explanation:

........pls brainliest

8 0
2 years ago
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Given the reaction: 4A1 + 302 - 2A1,O, How many grams of Al will be
dlinn [17]

Answer:

The answer to your question is 27 g of Al

Explanation:

Data

mass of Al = ?

moles of Al₂O₃ = 0.5

The correct formula for the product is Al₂O₃

Balanced chemical reaction

               4Al + 3O₂   ⇒   2Al₂O₃

Process

1.- Calculate the molar mass of the product

Al₂O₃ = (27 x 2) + (16 x 3)

         = 54 + 48

         = 102 g

2.- Convert the moles of Al₂O₃ to grams

               102 g ---------------- 1 mol

                 x       ----------------  0.5 moles

                 x = (0.5 x 102) / 1

                 x = 51 g of Al₂O₃

3.- Use proportions to calculate the mass of Al

                4(27) g of Al --------------- 2(102) g of Al₂O₃

                     x               --------------- 51 g

                        x = (51 x 4(27)) / 2(102)

                        x = 5508 / 204

                        x = 27 g of Al

4 0
3 years ago
Explain the change in mass that occurs when the following substances are separately heated in open crucibles
aleksandrvk [35]

Answer:

your answer is (a) Copper Metal

Explanation:

7 0
3 years ago
The density of ethanol is 0.788 g/mL. What is the mass of 157 mL of alcohol?
Lina20 [59]

Answer:

<h3>The answer is 123.72 g</h3>

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

<h3>mass = Density × volume</h3>

From the question

volume = 157 mL

density = 0.788 g/mL

We have

mass = 0.788 × 157 = 123.716

We have the final answer as

<h3>123.72 g</h3>

Hope this helps you

6 0
3 years ago
In which situation is the acceleration of the car negative?
Charra [1.4K]

B) The velocity of the car reduced from 50k/m over one min.

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3 years ago
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