Ask question

Ask question

All categories

2 years ago

15

Food undergoes both physical and chemical changes during digestion. Which parts of the digestive process listed below is a physi

cal change that takes place in the mouth?

1 answer:

sergeinik [125]2 years ago

3 0

Answer:

To answer your question use the code ICE on here to get your answer works every time for me hope this helps

You might be interested in

Can somebody answer this please

Murrr4er [49]

The answer should be A.

7 0

3 years ago

Calcium nitrate tetrahydrate dissolves in cold water to the extent of 266 g per 100 cm3. What is the concentration of nitrate io

Soloha48 [4]

Answer : The correct option is, (b) 22.5 M

Explanation : Given,

Mass of calcium nitrate tetrahydrate = 266 g

Molar mass of calcium nitrate tetrahydrate = 236.15 g/mole

Volume of solution = $100cm^3=100mL$

Molarity : It is defined as the moles of solute present in one liter of solution.

Formula used :

$Molarity=\frac{\text{Mass of calcium nitrate tetrahydrate }\times 1000}{\text{Molar mass of calcium nitrate tetrahydrate }\times \text{volume of solution in ml}}$

Now put all the given values in this formula, we get:

$Molarity=\frac{266g\times 1000}{236.15g/mole\times 100ml}=11.26mole/L=11.26M$

As calcium nitrate tetrahydrate dissociate to give 1 mole of calcium ion, 2 moles of nitrate ion and 4 moles of water.

The concentration of nitrate ion = $2\times 11.26M=22.5M$

Thus, the concentration of nitrate ion is, 22.5 M

4 0

3 years ago

Which of the following would have the smallest atomic radius?<br> K+<br> Se2-<br> Ca2+

Rina8888 [55]

I'm not entirely sure but i think it's Se2-

4 0

2 years ago

What is the mole, and why is it useful in chemistry?

Snowcat [4.5K]

Answer:The mole is important because it allows chemists to work with the subatomic world with macro world units and amounts. Atoms, molecules and formula units are very small and very difficult to work with usually. However, the mole allows a chemist to work with amounts large enough to use.

Explanation:

6 0

3 years ago

Why will liquids evaporate even at room temperature?

mr Goodwill [35]

<h2>It can happen when liquids are cold or when they are warm. ... It turns out that all liquids can evaporate at room temperature and normal air pressure. Evaporation happens when atoms or molecules escape from the liquid and turn into a vapor. Not all of the molecules in a liquid have the same energy.</h2>

6 0

3 years ago