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3 years ago

Explain at the molecular level why does the mixing of rock salt with ice produce temperatures well below 0°c.

1 answer:

7 0

The mixing of rock salt with ice would produce temperatures below zero degrees Celsius because the freezing point or the melting point of water has been lowered. This happens because the vapor pressure of the water is lowered which means the water molecules has less tendency to break from the bonds. At the molecular level, the salt molecules contribute to the overall interaction of the molecules so the breaking of the bonds of the water molecules in the melting process would not only be water molecules only, there would be other molecules that would take up the energy supplied. This is called the freezing point depression.

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Which statement best represents the law of conservation of matter with regard to chemical reactions?(1 point)

Furkat [3]

The statement that best represents the law of conservation of matter with regard to chemical reactions would be the one that says the <u>reactants and products have the same number and type of atoms, but the atoms may be recombined.</u>

First, it is important to know that chemical reactions involve the breaking of bonds between atoms in reactants and the recombination of the atoms in products.

The law of conservation of matter also states that matter (atom) can neither be created nor destroyed in a reaction, but can be converted from one form to another.

Thus, going by the above points, the number of atoms of each element in reactants must also be the same in products. However, recombination of the atoms would most likely have occurred before reactions can take place.

More on the law of conservation of matter can be found here: brainly.com/question/9434062

4 0

3 years ago

Read 2 more answers

Two samples of carbon tetrachloride were decomposed into their constituent elements. One sample produced 32.4 g of carbon and 37

Gnoma [55]

Answer:

The answer to your question is:

Explanation:

Law of constant composition states that a given compound always contains its component elements in a fixed ratio.

Data

Sample 1 32.4 g of C and 373 g of Cl

Sample 2 12.3 g of C and 112 g of Cl

Convert the grams to moles and compare the ratios

Sample 1 Sample 2

12 g of C --------------- 1 mol 12 g of C -------------- 1 mol

32.4 g ---------------- x 12.3 ------------- x

x = (32.4 x 1) / 12 x = (12.3 x 1) / 12

x = 2.7 moles of C x = 1.025 moles of C

35.5 g of Cl ---------- 1 mol 35.5 g of Cl ---------- 1 mol

373 g ------------------ x 112 g of Cl ----------- x

x = (373 x 1) / 35.5 x = (112 x 1) / 35.5

x = 10.5 moles of Cl x = 3.15 moles of Cl

Ratio

10.5 / 2.7 = 3.9 3.15/1.025 = 3.1

The ratio must be equal in both samples to say that the law is constant. So the answer is NO.

2.-

1) H3PO4 3 hydrogens

2) Na2HPO4 1 hydrogen

3) Ca(HCO3)2 2 hydrogens

4) Ba(C2H3O2)2 6 hydrogens

8 0

3 years ago

How many valence orbitals does Cl have?

Sedaia [141]

7 Valence lectrons I am pretty sure

5 0

3 years ago

At high concentrations, inorganic fluoride inhibits enolase. In an anaerobic system that is metabolizing glucose as a substrate,

Alenkinab [10]

Answer:

<h2>A. 2-phosphoglycerate </h2>

Explanation:

Glycolysis is the process of breakdown of glucose into two 3-carbon molecules called pyruvate. The energy released during glycolysis is used to make ATP.

Enolase is the enzyme which plays very important role in glycolysis. In the 9th step of glycolysis, Enolase converts 2-phosphoglycerate into phosphoenolpyruvate.

This reaction of conversion of 2-phosphoglycerate to phosphoenolpyruvate is a reversible dehydration reaction.

Fluoride inhibits enolase, so when enolase is become non-functional then there is no convertion of 2-phosphoglycerate to phosphoenolpyruvate, so the concentraion of 2-phosphoglycerate is increases by the addition of fluoride.

5 0

3 years ago

Order these units from smallest to largest:

Dennis_Churaev [7]

Pm, nm, um, mm, cm, m, dm, km

7 0

4 years ago

Read 2 more answers