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2 years ago

How to do this question plz answer

Chemistry

1 answer:

Ludmilka [50]2 years ago

7 0

Answer:

try reread the question and give it your be best guess

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Which is a thermosetting plastic?<br><br>Polythene<br>PVC<br>Melamine<br>Nylon

serg [7]

Melamine should be the right answer, i hope this helps.

5 0

3 years ago

Hemoglobin ___________. (Select all that apply).

alexandr1967 [171]

Answer:

Option B and A

Explanation:

First our lungs take purified oxygen from air then provide it to heart
Our heart gives oxygen to hemoglobin which is present in our blood
It carries oxygen to all cells
and comes back with cO_2

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1 year ago

How many grams of water are produced when 35.8 grams of Calcium hydroxide reacts with lots of Hydrochloric acid?

Veseljchak [2.6K]

Are produced 72 grams of water in this reaction.

<h3>Mole calculation</h3>

To find the value of moles of a product from the number of moles of a reactant, it is necessary to observe the stoichiometric ratio between them:

$Ca(OH)_2 + 2HCl = > 2H_2O + CaCl_2$

Analyzing the reaction, it is possible to see that the stoichiometric ratio is 1:2, so we can perform the following expression:

$MM_{Ca(OH)_2} = 74.1g/mol$

$MM = \frac{g}{mol}$

$74.1 = \frac{35.8}{mol}\\mol = 2$

So, if there are 2 mols of Ca(OH)2:

Ca(OH)2 | H2O

$\frac{1mol}{2mol} =\frac{2mol}{xmol}$

$x = 4mol$

Finally, just find the number of grams of water using your molar mass:

$MM_{H_2O} = 18g/mol$

$18= \frac{m}{4}\\m = 72g$

So, 72 grams are produced of water in this reaction.

Learn more about mole calculation in: brainly.com/question/2845237

5 0

2 years ago

_______ properties depend on the concentration of a solute in a solution but not on the identity of the solute.

Grace [21]

This problem is providing us with a statement in which we need to figure out the word fitting in the blank. At the end, after analyzing the information, the word turns out to be colligative as show below:

<h3>Colligative properties.</h3>

In chemistry, colligative properties of solutions account for the behavior of a solution with respect to the pure solvent, to which a solute is added.

Among them, we have boiling point elevation, freezing point depression, vapor pressure lowering and osmotic pressure, which are all affected by the concentration of the solute but not by the identity of the solute.

In such a way, we conclude that the correct word that fits in the blank is colligative as shown below:

"Colligative properties depend on the concentration of a solute in a solution but not on the identity of the solute."

Learn more about colligative properties: brainly.com/question/10323760

5 0

2 years ago

What are some substances that from ion-ion forces?

Anika [276]

Answer:

The three major types of intermolecular interactions are dipole–dipole interactions, London dispersion forces (these two are often referred to collectively as van der Waals forces), and hydrogen bonds.

6 0

3 years ago

How to do this question plz answer ​

How to do this question plz answer