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
GREYUIT [131]
3 years ago
13

Which of these questions is a scientific question?

Chemistry
1 answer:
n200080 [17]3 years ago
5 0
A or B but i'm leaning more towards A
You might be interested in
Why does Earthquakes occur?
Annette [7]
Shifting plates, underwater volcanoes. many different variables come in play
6 0
3 years ago
How much energy must be removed from a 94.4 g sample of benzene (molar mass= 78.11 g/mol) at 322.0 K to solidify the sample and
Kay [80]

Answer : The energy removed must be, 29.4 kJ

Explanation :

The process involved in this problem are :

(1):C_6H_6(l)(322K)\rightarrow C_6H_6(l)(279K)\\\\(2):C_6H_6(l)(279K)\rightarrow C_6H_6(s)(279K)\\\\(3):C_6H_6(s)(279K)\rightarrow C_6H_6(s)(205K)

The expression used will be:  

Q=[m\times c_{p,l}\times (T_{final}-T_{initial})]+[m\times \Delta H_{fusion}]+[m\times c_{p,s}\times (T_{final}-T_{initial})]

where,

Q = heat released for the reaction = ?

m = mass of benzene = 94.4 g

c_{p,s} = specific heat of solid benzene = 1.51J/g^oC=1.51J/g.K

c_{p,l} = specific heat of liquid benzene = 1.73J/g^oC=1.73J/g.K

\Delta H_{fusion} = enthalpy change for fusion = -9.8kJ/mol=-\frac{9.8\times 1000J/mol}{78g/mol}=-125.6J/g

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

Q=[94.4g\times 1.73J/g.K\times (279-322)K]+[94.4g\times -125.6J/g]+[94.4g\times 1.51J/g.K\times (205-279)K]

Q=-29427.312J=-29.4kJ

Negative sign indicates that the heat is removed from the system.

Therefore, the energy removed must be, 29.4 kJ

3 0
3 years ago
How many moles of butane (C4H10) must be burned in an excess of O2 to produce
Sedbober [7]

Answer: 6,25 moles

Explanation: mark amount of butane x.

From equation you can calculate x in a following way:

2/x = 8/25. 8x = 50. And x = 6,25

4 0
2 years ago
Select a word from the drop-down menu to correctly complete the statement.
natka813 [3]

Answer: Fluorine and chlorine are gases. Bromine is one of only two liquid elements, and iodine is a solid.

6 0
2 years ago
Read 2 more answers
What takes place in organelles called chloroplasts
Vitek1552 [10]
Photosynthesis takes place in the chloroplasts, that is why the chloroplasts is green. The function of this organelles is to create energy into sugar from the sunlight.
5 0
3 years ago
Other questions:
  • The density of silver is 10.5 g/cm3. A piece of silver that occupies a volume of 42.5 cm3 would have a mass of ________ g.
    14·2 answers
  • Kelvin is the SI unit of temperature true or false
    8·2 answers
  • PLEASEEEEEEEEEEE HELP WILL MARK BRAINLIEST!!!!!!!!!!!
    7·2 answers
  • Approximate temperature of a .7 mold sample of a gas at 1.2 ATM and volume of .170 L
    10·1 answer
  • how many calories are absorbed by a pot of water with a mass of 500 g in order to raise the temperature from 20 c to 30 c
    5·1 answer
  • This is the chemical formula for acetone: CH32CO. Calculate the mass percent of carbon in acetone.
    15·1 answer
  • Sijagsjshshsjwhwbsisjwbshhs
    10·2 answers
  • List the number of protons, neutrons, and electrons in titanium<br><br> P-<br><br> N-<br><br> E-
    10·2 answers
  • What landform develops when water causes deposition, bringing huge deposits of sediment to the mouth of a river?
    11·2 answers
  • Step 3: Measure the speed of the Toy Car on the Lower Track
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!