The abbreviation that represents a volume unit isa. cm3.
b. mg.
c. mm.
d. cm.

Answers

Answer 1

Answer: The answer is A - cm3

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Which of these solutions has the highest freezing point?1.0 M molecular sucrose (C12H22O11)
1.0 M ionic sodium chloride (NaCl)
1.0 M ionic calcium bromide (CaBr2)
1.0 M ionic aluminum bromide (AlBr3)
1.0 M ionic potassium chloride (KCl)

Answers

Answer: 1.0 M molecular sucrose (C₁₂H₂₂O₁₁).

Explanation:

1) The depression of the freezing point of a solvent when you add a solute is a colligative property.

2) Colligative properties are those physical properties of solutions that depends on the number of solute particles dissolved into the solution.

3) The relation between the number of solute particles and the depresson of the freezing point is proportional: the greater the number of solute particles the greater the freezing point depression.

4) You need to find the solution with the highest freezing point, this is the solution in which the freezing point decreased the least.

5) Then, that is the solution with least number of solute particles.

6) Since all the given solutions have the same molarity (1.0 M), you only have to deal with the possible ionization of the different solutes.

7) NaCl, CaBr₂, AlBr₃, and KCl are ionic compounds, so each unit of them will ionize into two, three, four, and two ions, respectively, while sucrose, being a covalent compound does not dissociate.

Then, 1.0 M solution of sucrose will have less solute particles than the others, and will exhitibit the lowest freezing point depression, meaning that it will have the highest freezing point of the given solutions.

The right answer for the question that is being asked and shown above is that: "1.0 M ionic aluminum bromide (AlBr3)." the solution that has the highest freezing point is that 1.0 M ionic aluminum bromide (AlBr3)

Which of the following is not a result of air pollution? A. Smog
B. Breathing problems
C. Global warming
D. Soil erosion

Answers

Smog is the combination of smoke and fog. Smokeis the result of human activity such as burning of wood, coal, etc. This is aresult of air pollution. Breathing problems are the effects of air pollutionbecause it destroys the respiratory system. Global warming is also an effect ofair pollution. The consecutive production of carbon monoxide fromtransportation vehicle, mismanagement of garbages contributes to globalwarming. Soil erosion however is the result of fluid always passing on to thatarea. This is not the result of air pollution. The answer is letter d.

D is the answer....all otherr are a result of pollution

Show a numerical setup for calculating the percent by mass of NaCl in the solution inbeaker 4.

Answers

Let's think about the solution first: it's composed of water (100 g) and 35.04 grams of NaCl (in beaker for)

together it's 100+35.04=135.04

and NaCl in this solution is 35.04/135.04=25.95.

So the answer is 25.95

Mass Percentage Definition. Mass percentage is one way of representing the concentration of an element in a compound or a component in a mixture. Mass percentage is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100%.
% mass = [( 35.04) / ( 100 + 35.04)] * 100
% mass = 25.95 %

If an object 18 millimeters high is placed 12 millimeters from a diverging lens and the image is formed 4 millimeters in front of the lens what is the height of the image

Answers

Answer:The height of the image is -6 mm.

Explanation;

Distance of the object form the lens = u = 12 mm

Distance of the image formed from the lens = v = 4 mm

Height of the object = 18 mm= $h_o$

The magnification is given by :

$M=-(v)/(u)=(h_i)/(h_o)$

$h_i\& h_o$ = Height of an image and object respectively.

$M=-(4 mm)/(12 mm)=(h_i)/(18 mm)$

$h_i=-6 mm$

The height of the image is -6 mm.The image formed is real and negative sign signifies that image is inverted.

In which type of solution does an equilibrium always exist?

Answers

You could argue that any solution with water in it has an equilibrium in it of some sort. If a solution is over saturated there is an equilibrium between the dissociated and solid solute (for example NaCl(s)⇄Na⁺(aq)+Cl⁻(aq) when in water). Even if the solution is not over saturated, water always has the reaction 2H₂O(l)⇄H₃O⁺(aq)+OH⁻(aq) since water can act as both an acid and a base (this reaction is also always at equilibrium and the equilibrium constant is 1×10⁻¹⁴).

Since we usually ignore the autoionization of water (unless dealing with acid base chemistry), I think the answer your teacher is looking for is over saturated solutions.

I hope this helps. Let me know if anything is unclear or if you need a different answer.

Is graphite conductive ?