Chemistry College

which one of the following a compounds a.sugar b.rock salt c.iron d.alloy
which one of the following a
compound ?
a.sugar c.alloy
brock salt d.iron
​

Answers

Answer 1

Answer:

a

Explanation:

sugar is composed of different elements combined in a manner form

Related Questions

When drawing a Bohr model for Sulfur, how many energy levels will you
draw?
5
4
3
2.

Answers

Answer:

3

Explanation:

2,8,6

Jane is sitting in the family car. Her mother is driving her from their house to the library. Jane waves as she passes her friend Marina. Which of the following is not moving with respect to Jane?
A. Marina
B. The family car
C.The library
D. Jane’s house

Answers

Answer:

B) The family car

Explanation:

I hope this helps :)

If a solution containing 24.0 g of a substance reacts by first-order kinetics, how many grams remain after three half-lives?

Answers

Answer:

3.0g remain

Explanation:

The half-life is defined as the time required for a reactant to decrease its concentration in exactly the half of the initial amount of reactant. Having this in mind:

In one half-life, the mass will be:

24.0g / 2 = 12.0g

In two half-lifes:

12.0g / 2 = 6.0g

And in three half-lifes, the mass that remain is:

6.0g / 2 =

3.0g remain

Both magnetic fields and electric fields can exert a force true or false?

Answers

Answer:

false

Explanation:

An electric field may do work on a charged particle, while a magnetic field does no work.

Measurements show that the enthalpy of a mixture of gaseous reactants increases by 319kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that 92kJ of work is done on the mixture during the reaction. Calculate the change of energy of the gas mixture during the reaction in kJ.

Answers

Answer:

the change in energy of the gas mixture during the reaction is 227Kj

Explanation:

THIS IS THE COMPLETE QUESTION BELOW

Measurements show that the enthalpy of a mixture of gaseous reactants increases by 319kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that -92kJ of work is done on the mixture during the reaction. Calculate the change of energy of the gas mixture during the reaction in kJ.

From thermodynamics

ΔE= q + w

Where w= workdone on the system or by the system

q= heat added or remove

ΔE= change in the internal energy

q=+ 319kJ ( absorbed heat is + ve

w= -92kJ

If we substitute the given values,

ΔE= 319 + (-92)= 227 Kj

With the increase in enthalpy and there is absorbed heat, hence the reaction is an endothermic reaction.

5. Why is picric acid and tannic acid used in the treatment of burns?

Answers

Picric acid has antiseptic and astringent properties. For medical use it is incorporated in a surface anesthetic ointment or solution and in burn ointments. Picric acid is a much stronger acid than phenol; it decomposes carbonates and may be titrated with bases.

Question 2 2 points)
Which of the atoms shown has an atomic number of 42
1
2
4
7

Answers

Answer:

4 is the answer

Explanation:

i am not sure for this question

Rocks are classified on the basis of

Answers

Answer:

Rocks are classified according to characteristics such as mineral and chemical composition, permeability, texture of the constituent particles, and particle size. This transformation produces three general classes of rock: igneous, sedimentary and metamorphic. Those three classes are subdivided into many groups.

Explanation:

Which food dyes in the diagram on the right only contain one colour?
( Science, Chromatography )​

Answers

Colored dyes are really bad for you but I drink them anyways
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