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
Citrus2011 [14]
4 years ago
12

PLEASE HELP! ASAP! An unknown substance is heated from 10 °C to 25 °C. The table below shows the state of the substance at diffe

rent temperatures.
Time (minutes) Temperature (degrees Celsius) State of matter
0 10 Liquid
2 15 Liquid
4 20
6 20
8 20
10 23 Gas
12 25 Gas


Which statement is correct about the unknown substance?
Its boiling point is 20 °C.
Its boiling point is 15 °C.
The substance sublimes at 15 °C.
The substance exists as a solid at 20 °C.
Chemistry
2 answers:
oksano4ka [1.4K]4 years ago
8 0

Answer: Answer is A) It's boiling point is 20 degree C.

Explanation: Boiling point is the temperature at which a liquid starts boiling and converting into gas.

Looking at the given data, The substance is a liquid at 0 degree C and after heating for 2 minutes its still liquid, On further heating for next 6 minutes(total 8 minutes from starting) the temperature remains constant that indicates a phase change. Since, the substance was initially a liquid, so at 20 degree C the boiling starts and it turns into a gas.

Further heating increases the temperature but the phase does not change and hence its a gas beyond 20 degree C like at 23 degree C and 25 degree C.

So, the right answer is A) It's boiling point is 20 degree C.

Oksanka [162]4 years ago
3 0

It should be 18 but that's not an answer........?

You might be interested in
The six kingdom system was designed
KonstantinChe [14]

Answer:

Prokaryotes is the answer

hope it helped

3 0
4 years ago
How many titanium atoms does it contain? titanium has a density of 4.50g/cm3, a pure titanium cube has an edge length of 2.82 in
yKpoI14uk [10]
2.82 inches is are equivalent to 7.16 cm.
The volume of the cube ;
 7.16 × 7.16 ×  7.16 = 367.06 cm³
The density of titanium is 4.5 g/cm³
Therefore; mass will be 4.5 × 367.06 = 1651.77 g
1 mole of titanium has 47.867 g
thus, 1651.77 g is equivalent to  1651.77/ 47.867 = 34.507 moles
According to the Avagadro's constant 1 mole = 6.022 × 10∧23 atoms 
 Therefore, we get 6.022 × 10∧23 × 34.507 = 2.078 ×10∧25 atoms
5 0
3 years ago
Read 2 more answers
An elevator is rising at a constant speed. What forces are acting on the elevator? A. normal, gravity and tension B.gravity and
yKpoI14uk [10]
I would say B I hope this helps
3 0
3 years ago
Read 2 more answers
What is the molar mass for CaWO4
djverab [1.8K]

Answer:

Calcium tungstate

287.93 g/mol

8 0
2 years ago
Find the mass of 3.27 x 10^23 molecules of H2SO4. Use 3 significant digits<br> and put the units.
marta [7]

Answer:

Approximately 53.3\; \rm g.

Explanation:

Lookup Avogadro's Number: N_{\rm A} = 6.02\times 10^{23}\; \rm mol^{-1} (three significant figures.)

Lookup the relative atomic mass of \rm H, \rm S, and \rm O on a modern periodic table:

  • \rm H: 1.008.
  • \rm S: 32.06.
  • \rm O: 15.999.

(For example, the relative atomic mass of \rm H is 1.008 means that the mass of one mole of \rm H\! atoms would be approximately 1.008\! grams on average.)

The question counted the number of \rm H_2SO_4 molecules without using any unit. Avogadro's Number N_{\rm A} helps convert the unit of that count to moles.

Each mole of \rm H_2SO_4 molecules includes exactly (1\; {\rm mol} \times N_\text{A}) \approx 6.02\times 10^{23} of these \rm H_2SO_4 \! molecules.

3.27 \times 10^{23} \rm H_2SO_4 molecules would correspond to \displaystyle n = \frac{N}{N_{\rm A}} \approx \frac{3.27 \times 10^{23}}{6.02 \times 10^{23}\; \rm mol^{-1}} \approx 0.541389\; \rm mol of such molecules.

(Keep more significant figures than required during intermediary steps.)

The formula mass of \rm H_2SO_4 gives the mass of each mole of \rm H_2SO_4\! molecules. The value of the formula mass could be calculated using the relative atomic mass of each element:

\begin{aligned}& M({\rm H_2SO_4}) \\ &= (2 \times 1.008 + 32.06 + 4 \times 15.999)\; \rm g \cdot mol^{-1} \\ &= 98.702\; \rm g \cdot mol^{-1}\end{aligned}.

Calculate the mass of approximately 0.541389\; \rm mol of \rm H_2SO_4:

\begin{aligned}m &= n \cdot M \\ &\approx 0.541389\; \rm mol \times 98.702\; \rm g \cdot mol^{-1}\\ &\approx 53.3\; \rm g\end{aligned}.

(Rounded to three significant figures.)

6 0
3 years ago
Other questions:
  • HELP PLZZZZZZZZZ ASAP!!!!!
    6·2 answers
  • Una especie que se aparea en la superficie y luego deposita sus huevos en el agua para ser rodeadas por los espermas, el de
    6·1 answer
  • 14. (a) Describe how you would
    13·1 answer
  • Which subatomic particles differ in number for two isotopes of the same element, and which subatomic particles will stay consist
    13·1 answer
  • Write the chemical formula for sodium hypobromite.
    5·1 answer
  • An atom has a charge of +1 in its nucleus.
    14·1 answer
  • What is the iupac name of: ​
    6·1 answer
  • B. Radiation
    12·2 answers
  • All atoms of the same elements have the same what?
    10·2 answers
  • Fill in the [?]:<br> 1,516,000,000 nm = [?]m<br> Give your answer in standard form.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!