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KIM [24]
3 years ago
13

When 13.6 grams of kcl are dissolved in enough water to create a 180-gram solution, what is the solution's concentration, expres

sed as a percent by mass? 4.6% kcl 6.8% kcl 7.6% kcl 8.2% kcl?
Chemistry
2 answers:
bonufazy [111]3 years ago
8 0
7.6% KCl I had the same problem on my semester exam for summer school
jek_recluse [69]3 years ago
6 0

Answer: 7.6% KCl

Explanation: Mass of solute is given as 13.6 grams and the mass of solution is 180 grams. The question asks to calculate the solution concentration, expressed as a percent by mass.

The formula for percent by mass is:

% by mass = \frac{solute}{solution}*100

Let's plug in the values in the formula and do the calculations.

% by mass = \frac{13.6g}{180g}*100  = 7.6%

So, the correct choice is C) 7.6% KCl.

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All of the following statements are correct except The conversion of compounds into elements is a chemical change. The conversio
aleksandrvk [35]

Answer:

The conversion of liquid water into gaseous water is a chemical change

Explanation:

A chemical change occurs when there is a chemical reaction, so there'll be changed in the compounds, such as forming new ones, forming its elements, or elements forming compounds.

A physical change occurs when there is a change in the state of aggregation of the compound, it means that it changes its physical state. Solid for liquid, liquid for solid, liquid for gas, gas for liquid, solid for gas, and gas for solid are the physical changes.

So the evaporation of water, or its conversion in gaseous water, is a physical change, not a chemical change.

6 0
3 years ago
What is the Lewis structure for Iodide?
jasenka [17]

Answer:

In the Lewis structure for IF5 you'll need to put a total of 12 valence electrons on the Iodine atom in order to draw the Lewis structure. Remember that Iodine (I) can hold more than eight valence electrons. For the IF5 Lewis structure, calculate the total number of valence electrons for the IF5 molecule

Explanation:

<em> I be knowing hope this helps</em>

5 0
2 years ago
Some activities that are generally considered to be work are not called work by scientists. Explain why.​
Flura [38]

Answer:

Certain things we think of as hard work, such as writing an exam or carrying a heavy load on level ground, are not work as defined by a scientist. The scientific definition of work reveals its relationship to energy—whenever work is done, energy is transferred.

For work, in the scientific sense, to be done, a force must be exerted and there must be motion or displacement in the direction of the force.

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2 years ago
A 25.00 mL sample of vinegar was titrated with 39.27 mL of 0.4293 M NaOH. Calculate the concentration of acetic acid in the vine
QveST [7]

Answer:

0.6743 M

Explanation:

HC₂H₃O₂ + NaOH → NaC₂H₃O₂ + H₂O

First we <u>calculate how many NaOH moles reacted</u>, using the <em>definition of molarity</em>:

  • Molarity = moles / volume
  • moles = Molarity * volume
  • 0.4293 M * 39.27 mL = 16.86 mmol NaOH

<em>One NaOH moles reacts with one acetic acid mole</em>, so <u>the vinegar sample contains 16.86 mmoles of acetic acid as well</u>.

Finally we <u>calculate the concentration (molarity) of acetic acid</u>:

  • 16.86 mmol HC₂H₃O₂ / 25.00 mL = 0.6743 M
4 0
3 years ago
Which kind of covalent bond has unequal sharing of electrons
lutik1710 [3]

Polar.

Polar bonds have unequal sharing electrons while nonpolar, the opposite, has equal sharing electrons. This is a tactic typically used to determine whether or not a compound or element itself is polar or nonpolar.

Hope this helps!

7 0
3 years ago
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