1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Bingel [31]
3 years ago
9

Atoms in a liquid have _________ energy than atoms in a solid, so the easiest way to change a solid to a liquid is to add ______

___. when changing from a solid to a liquid, there is a magic temperature for every substance called the ________________________________________.
Chemistry
1 answer:
Nitella [24]3 years ago
4 0
More,
heat/ energy,
melting point
You might be interested in
How many grams of sodium sulfide can be produced when 45.3 g Na react with 105 g S?
erastova [34]
Balance the equation: 2Na + S --> Na2S
Using the given amount of the reactants in the reaction, calculate the amount of the product:
45.3g Na x (1 mol/22.99 g)= 1.97 mol of Na
105f S x (1 mol/ 32.06g) = 3.28 mol of S
The limiting reactant would be Na:
<span>1.97 mol Na x (1 mol Na2S/ 2 mol Na) x (78.04g/mol) = 76.87g of Na2S produced</span>
8 0
3 years ago
When a student mixes 50 mL of 1.0 M HCl and 50 mL of 1.0 M NaOH in a coffee-cup calorimeter, the temperature of the resultant so
zmey [24]

Answer: 54.4 kJ/mol

Explanation:

First we have to calculate the moles of HCl and NaOH.

\text{Moles of HCl}=\text{Concentration of HCl}\times \text{Volume of solution}=1.0M\times 0.05=0.05mole

\text{Moles of NaOH}=\text{Concentration of NaOH}\times \text{Volume of solution}=1.0\times 0.05L=0.05mole

The balanced chemical reaction will be,

HCl+NaOH\rightarrow NaCl+H_2O

From the balanced reaction we conclude that,

As, 1 mole of HCl neutralizes by 1 mole of NaOH

So, 0.05 mole of HCl neutralizes by 0.05 mole of NaOH

Thus, the number of neutralized moles = 0.05 mole

Now we have to calculate the mass of water:

As we know that the density of water is 1 g/ml. So, the mass of water will be:

The volume of water = 50ml+50ml=100ml

\text{Mass of water}=\text{Density of water}\times \text{Volume of water}=1g/ml\times 100ml=100g

Now we have to calculate the heat absorbed during the reaction.

q=m\times c\times (T_{final}-T_{initial})

where,

q = heat absorbed = ?

c = specific heat of water = 4.18J/g^oC

m = mass of water = 100 g

T_{final} = final temperature of water = 27.5^0C

T_{initial} = initial temperature of metal = 21.0^0C

Now put all the given values in the above formula, we get:

q=100g\times 4.18J/g^oC\times (27.5-21.0)^0C

q=2719.6J=2.72kJ

Thus, the heat released during the neutralization = 2.72 KJ

Now we have to calculate the enthalpy of neutralization per mole of HCl:

0.05 moles of HCl releases heat = 2.72 KJ

1 mole of HCl releases heat =\frac{2.72}{0.05}\times 1=54.4KJ

Thus the enthalpy change for the reaction in kJ per mol of HCl is 54.4 kJ

6 0
3 years ago
Read 2 more answers
Use the graph to answer these questions. The total energy of the reactants is –3,811.92 kJ. –1,273.02 kJ. –2,538.90 kJ.
TEA [102]

Answer:

the first one

Explanation:

8 0
2 years ago
Read 2 more answers
Thermal energy is transferred from?
aliina [53]

Answer:

chemical and electrical ( and sometimes nucelar)

Explanation:

4 0
3 years ago
Read 2 more answers
Desiré was investigating a chemical reaction.When she heated it up, she found that sulfuric acid changed into water. She made th
pochemuha

Answer:

no it is not a complete model

3 0
3 years ago
Other questions:
  • A piece of glass with a mass of 32.50 g specific heat of 0.840 J/g*°C and an initial temperature of 115 °C was dropped into a ca
    8·2 answers
  • Which of the following is the correctly balanced equation for the reaction of a Ca(OH)2 and HNO3
    7·1 answer
  • Write the net ionic equation for this reaction occurring in water: ammonium fluoride and magnesium chloride are mixed to form ma
    10·1 answer
  • Which of the following atoms are isotopes? 22Na 22Ne 22Na 22Mg 24Na
    8·1 answer
  • What are 2 indications that a chemical change has occurred?
    12·1 answer
  • An example of a decomposer is a:<br><br> rabbit<br> mushroom<br> tulip
    14·1 answer
  • What is this?<br> "This car is speeding up"
    11·2 answers
  • THIS IS URGENT PLEASE HELPPPPPP (NO LINKS PLEASE)
    5·1 answer
  • When the motor has finished pulling the roller coaster car to the top of the very first hill, what moves the car down the hill?
    8·1 answer
  • Pls help me with my chemistry finals test.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!