All categories

3 years ago

How does the freezing point of a substance relate to its melting point?

Chemistry

1 answer:

NNADVOKAT [17]3 years ago

6 0

Answer:

The melting temperature of a solid is generally considered to be the same as the freezing point of the corresponding liquid; because a liquid may freeze in different crystal systems and because impurities lower the freezing point, however, the actual freezing point may not be the same as the melting point.

<h3>#carryONlearning </h3>

You might be interested in

What is the most metallic item on the pterotic table

statuscvo [17]

Answer:

francium or cesium

7 0

3 years ago

Read 2 more answers

What is the lewis dot structure for Cu2S

Trava [24]

Answer:

LOL i belive its 200 because i did this exact same thing yesterday for homework and got it right so yeah, it should work. if it doesnt im sorry! but yeah XD sub to my yt channel too! DB_PLAYS <3

Explanation:

3 0

3 years ago

Read 2 more answers

HCl(aq)+NaOH(aq) → NaCl(aq)+H2O)

Anna11 [10]

Answer:

The temperature of the reaction mixture increases.

Explanation:

One very good indicator that a chemical reaction has taken place is that there is a temperature change about the reaction.

Either an emission of heat involving the reaction milieu becoming hotter or an absorption of heat making the environment colder.

Enthalpy changes of reactions are good parameters to measure whether or not a reaction has taken place.
There is no color change, and mass is always conserved for most reaction, so we cannot use these tools for assessing whether a reaction has occurred or not.

8 0

3 years ago

A kno3 solution containing 47 g of kno3 per 100.0 g of water is cooled from 40 ∘c to 0 ∘c. what will happen during cooling?

kakasveta [241]

When water is cooled from $40^{0}C$ to $0^{0}C$ , the temperature of the solution is decreases. Due to decrease in temperature, the intermolecular forces which are present between the solute particles will not break easily.

Decrease in temperature also results in the decrease in solubility. Thus, due to decrease in temperature, $KNO_{3}$ will precipitate implies that the solubility of $KNO_{3}$ in water decreases.

Hence, precipitation of $KNO_{3}$ occurs.

4 0

3 years ago

Iron(III) oxide reacts with carbon monoxide to produce iron and carbon; Fe2O3(s)+3CO(g)-->2Fe(s)+3CO2(g). a) What is the perc

VMariaS [17]

Answer:

a) %yield= 33.00 %

b) %yield= 72.1 %

Explanation:

Step 1: Data given

Mass of iron(III) oxide = 65.0 grams

mass of iron produced = 15.0 grams

Molar mass of Fe2O3 = 159.69 g/mol

Molar mass of CO = 44.01 g/mol

Step 2: The balanced equation:

Fe2O3(s)+3CO(g) →2Fe(s)+3CO2(g)

Step 3: Calculate moles of Fe2O3

Moles Fe2O3 = 65.0 grams / 159.69 g/mol

Moles Fe2O3 = 0.407 moles

Step 4: Calculate moles Fe

For 1 mole Fe2O3 we'll have 2 moles Fe

For 0.407 moles Fe2O3 we'll have 2*0.407 = 0.814 molesFe

Step 5: Calculate mass Fe

Mass fe = 0.814*55.845 g/mol

Mass Fe = 45.46 grams = theoretical yield

Step 6: Calculate % yield

%yield = (actual yield/theoretical yield)*100%

%yield = (15.0/45.46)*100%

%yield= 33.00 %

b) What is the percent yield for the reaction if 75.0 g of carbon monoxide produces 85.0 g of carbon dioxide?

Step 1: Data given

Mass of CO = 75.0 grams

mass of CO2 produced = 85.0 grams

Molar mass of CO = 28.01 g/mol

Molar mass of CO2 = 44.01 g/mol

Step 2: The balanced equation:

Fe2O3(s)+3CO(g) →2Fe(s)+3CO2(g)

Step 3: Calculate moles of CO

Moles CO = 75.0 grams / 28.01 g/mol

Moles CO = 2.68 moles

Step 4: Calculate moles CO2

For 1 mole Fe2O3 we need 3 moles CO to produce 2 moles Fe and 3 moles CO2

For 2.68 moles CO we'll have 2.68 moles CO2

Step 5: Calculate mass CO2

Mass CO2= 2.68 * 44.01 g/mol

Mass CO2 = 117.95 grams = theoretical yield

Step 6: Calculate % yield

%yield = (actual yield/theoretical yield)*100%

%yield = (85.0/117.95)*100%

%yield= 72.1 %

7 0

4 years ago