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
Rudik [331]
3 years ago
8

Simon has collected three samples from the coral reef where he observes marine life. He must determine whether each one is a pur

e substance or a mixture.
A 4-column table with 3 rows. The first column has entries sample A, sample B, sample C. The second column labeled appearance has entries clear liquid, clear blue liquid, opaque whitish liquid. The third column labeled when heated has entries evaporates completely at 70 degrees C, boils at 90 degrees Cleaving blue crystals behind, boils at 100 degrees leaving white crystals behind. The fourth column labeled when left over time has entries appearance does not change, appearance does not change, dust appears to settle at the bottom.

Sample A is a
, Sample B is a
, and Sample C is a
.
Chemistry
1 answer:
-Dominant- [34]3 years ago
3 0

Answer:

SAMPLE A - pure substance.

SAMPLE B - homogeneous mixture.

SAMPLE C - heterogeneous mixture.

Explanation:

You might be interested in
What is Delta.Gsystem for the system that is described by the following data? Delta.Hsystem = –345 kJ, T = 293 K, Delta.Ssystem
ryzh [129]

Answer:

-209 kJ

Explanation:

I did the math. You're welcome ;)

6 0
3 years ago
Can a molecule have polar bonds, but still be a no polar molecule?
My name is Ann [436]

<em><u>A molecule </u></em><em><u>can </u></em><em><u>possess polar bonds and still be nonpolar.</u></em>

I hope this helped. Have a nice day, make sure to take care of yourself. You're loved <3

5 0
3 years ago
Read 2 more answers
Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simulta
scoray [572]

Answer:

70.77 g/mol is the molar mass of the unknown gas.

Explanation:

Effusion is defined as rate of change of volume with respect to time.

Rate of Effusion=\frac{Volume}{Time}

Effusion rate of oxygen gas after time t = E=\frac{4.64 mL}{t}

Molar mass of oxygen gas = M = 32 g/mol

Effusion rate of unknown gas after time t = E'=\frac{3.12 mL}{t}

Molar mass of unknown gas = M'

The rate of diffusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

\text{Rate of effusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}

\frac{E}{E'}=\sqrt{\frac{M'}{M}}

\frac{\frac{4.64 mL}{t}}{\frac{3.12 mL}{t}}=\sqrt{\frac{M'}{32 g/mol}}

M' = 70.77 g/mol

70.77 g/mol is the molar mass of the unknown gas.

8 0
3 years ago
Which of the following is not an example of a chemical reaction? Rust Heat from Fire Photosynthesis Melting Ice
VARVARA [1.3K]
Melting ice. Hopefully this helps!
8 0
3 years ago
Read 2 more answers
What do March 21st and September 21st have in common?
pogonyaev

Answer:

The equinoxes are the only time when both the Northern and Southern Hemispheres experience roughly equal amounts of daytime and nighttime. On Earth, there are two equinoxes every year: one around March 21 and another around September 22.

Explanation:

5 0
3 years ago
Other questions:
  • What’s the scientific notation for 654,000
    15·1 answer
  • You could also graph decay time (in seconds or minutes) vs. number of radioactive nuclei. How would this graph differ from the g
    6·2 answers
  • What fraction of atoms in morphine is accounted for by carbon?
    5·2 answers
  • Which of the following compounds would be named with a name that ends in -yne?
    9·2 answers
  • For the following reaction, identify whether the compound in bold is behaving as an acid or a base.
    12·1 answer
  • During the phase change from solid ice to liquid water, which bonds/forces are being weakened?
    6·2 answers
  • Explain why iron sulfide has different properties from a physical mixture of the elements iron and sulfur?
    5·2 answers
  • 1. Which is not an example of a physical change to a wooden stick?
    12·1 answer
  • Balance the equation :<br> CoBr3 + CaSO4<br><br> please define how many atoms each element contain
    14·1 answer
  • Calculate the molarity of each of the following
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!