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Bess [88]
3 years ago
14

17 Two substances in a mixture differ in density and particle size. These properties can be used to(1) separate the substances

Chemistry
2 answers:
belka [17]3 years ago
6 0
If they're different sizes and densities, you are able to separate the substances. 
GrogVix [38]3 years ago
4 0

Answer:The correct answer is option (1).

Explanation:

Density is defined as mass of substance present in the unit volume of the substance.

Density can be used to separate two substance from their mixture. Substance with lower density will place itself on the top of the substance with higher density, And in order to distinguish those two substance from each other one can easily observe the boundary among those substance.

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Which of the following is a characteristic of all chemical changes?A. A different state of matter is produced. B. Some mass is c
blagie [28]
Letter A is the characteristic of all chemical change
8 0
3 years ago
Name of molecule formed upon oxidation of aldehyde to carbonyl group
storchak [24]
Aldehyde is a group of organic compounds with the general form of RCHO. Oxidation of aldehyde can lead to the formation of the carboxylic acids, with the general form of RCO₂H. 

With this oxidation, the typical reagents promoting the oxidation are chromic acids, chromate salts, permanganate, etc. 
6 0
3 years ago
Which statement is true of energy in reactants during an endothermic reaction? (1 point)
pychu [463]

All of the energy from the reactants will be lost to the surroundings.The energy found in the reactants remains in the system, and the reactants also take energy from the

surroundings is true of energy in reactants during endothermic reaction.

<h3>What is Endothermic reaction?</h3>

Endothermic reaction is a reaction in thermochemistry where the reactants absorb heat from the surrounding to form the products.

In an endothermic reaction, the products have more energy than the reactants, that is they absorbed more energy. The reactants have less energy,that is they loss energy . Therefore, the change in enthalpy is positive, heat is absorbed from the surroundings during the reaction.

Therefore, All of the energy from the reactants will be lost to the surroundings.

The energy found in the reactants remains in the system, and the reactants also take energy from the

surroundings is true of energy in reactants during endothermic reaction.

For more details on endothermic reaction check the link below.

brainly.com/question/6506846

7 0
2 years ago
How many molecules of HCl are needed to react with 1.7 moles of magnesium. The products of
juin [17]

Answer:

2.05 x 10²⁴ molecules

Explanation:

The balanced equation for the chemical reaction is the following:

2 HCl + Mg → MgCl₂ + H₂

According to the equation, 2 moles of HCl are required to react with 1 mol of magnesium (Mg), so the moles of HCl required to react with 1.7 mol Mg are calculated as follows:

moles HCl = 1.7 mol Mg x 2 mol HCl/mol Mg = 3.4 mol HCl

We know that 1 mol of any compound is equal to 6.022 x 10²³ molecular entities, so we convert the moles of HCl to molecules as follows:

molecules HCl = 3.4 mol HCl x 6.022 x 10²³ molecules/1 mol = 2.05 x 10²⁴ molecules

4 0
2 years ago
What is the value of the rate constant for a second order reaction if the reactant conceretation drop sform 0.657 M to 0.0981 M
Ainat [17]

Answer:

The rate constant for a second order reaction is

k = 0.51 dm-3 s-1.

Explanation:

In a regular second-order reaction the rate equation is given by v = k[A][B], if the reactant B concentration is constant then v = k[A][B] = k'[A], where k' the pseudo–first-order rate constant = k[B].

Also 1/|A| = Kt + 1/|Ao|

But Ao = 0.657 M and

A = 0.0981 M also

t = 17.0 s

Therefore

1/| 0.0981 M| =K × 17.0 s + 1/| 0.657 M|

→ 10.19/M = 17K + 1.52/M

10.19/M - 1.52/M = 8.67/M = 17K

K = 8.67M/17s = 0.51 dm-3 s-1.

k = 0.51 dm-3 s-1.

6 0
3 years ago
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