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
rodikova [14]
2 years ago
7

Social Studies 3rd Period

Chemistry
1 answer:
docker41 [41]2 years ago
7 0

Answer:

The answer is A, B, and D

Explanation:

A: China burned coal more than wood for heat.

B: Marco Polo wrote about a new energy source from China.

D: Marco Polo helped spread technology and ideas all through out Europe.

You might be interested in
Which is the strongest acid listed in the table?
andrew11 [14]

Answer:

Hydrofluoric acid.

Explanation:

To know which of the acid is the strongest, let us determine the pka of each acid. This is illustrated below:

1. Acetic acid

Ka = 1.8x10^-5

pKa =..?

pKa = –logKa

pKa = –Log 1.8x10^-5

pKa = 4.74

2. Benzoic acid

Ka = 6.5x10^-5

pKa =..?

pKa = –logKa

pKa = –Log 6.5x10^-5

pKa = 4.18

3. Hydrofluoric acid.

Ka = 6.8x10^-4

pKa =..?

pKa = –logKa

pKa = –Log 6.8x10^-4

pKa = 3.17

4. Hypochlorous acid

Ka = 3.0x10^-8

pKa =..?

pKa = –logKa

pKa = –Log 3.0x10^-8

pKa = 7.52

Note: the smaller the pKa value, the stronger the acid.

The pka of the various acids as calculated above is given below:

Acid >>>>>>>>>>>>>>>>>> pKa

1. Acetic acid >>>>>>>>>> 4.74

2. Benzoic acid >>>>>>>> 4.18

3. Hydrofluoric acid >>>> 3.17

4. Hypochlorous acid >> 7.52

From the above illustration, we can see that hydrofluoric acid has the lowest pKa value. Therefore, hydrofluoric acid is the strongest among them.

6 0
3 years ago
The mass of an object is described in what??
inessss [21]
<span>The mass of an object is measured in either grams or kilograms. Mass is best described as the amount of matter, or "stuff," in a solid, and is different from weight (which is the force of gravity on an object). Since mass is used with solids, it will be measured in grams or kilograms (rather than in something like liters, which would be used with the volume of a liquid). To measure mass, you can use a balance, for example a triple balance beam.</span>
6 0
3 years ago
PLEASE HELP!! WILL MARK BRAINLIEST AND THANK YOU!! EXTRA POINTS!!
babunello [35]

Answer:

Balance

Measures mass

Metric Ruler

Measures length

Units - centimeter

Spring Scale

Measures weight

Units - grams

Graduated Cylinder

Measures liquid volume

i think this is the right answer please don't report me

8 0
3 years ago
How many atoms of Ga are there?
xz_007 [3.2K]
The answer is 2

Hope this helped ??
5 0
3 years ago
Which is a fossil fuel?<br> A.nuclear<br> B.Biomass<br> C.geothermal<br> D.coal
Nat2105 [25]

Answer:

Coal

Explanation:

Coal is composed of the remains of dead animals and plants, being pressed down over the course of thousands of years.

(Also can I please have Brainliest? I need it to level up)

8 0
3 years ago
Read 2 more answers
Other questions:
  • A gas has a volume of 350.0 mL at 45.0°C. If the volume changes to 400.0 mL, what is the new
    8·1 answer
  • How many tiny frogs sitting next to each other would measure the same length as a Blue Whale?
    7·2 answers
  • A scientist discovers a new substance. The molecules of the substance form hydrogen bonds with each other. When the molecules lo
    10·2 answers
  • Please help Which of the following is the SI unit used to measure length? a.kilogram b.liter c.meter d.Kelvin
    15·1 answer
  • Using Raoult’s law, estimate the boiling pressure and mole fractions in the vapor phase that is in equilibrium with a liquid hav
    10·1 answer
  • g Using Newman projections, draw the most stable conformation for each of the following compounds. (a) 3-methyl pentane, viewed
    5·1 answer
  • What is this equation balanced?
    5·1 answer
  • HELP!!
    15·1 answer
  • 2C_H. + 702 — 400, + 6H2O
    9·1 answer
  • Which detail shows ways that people can help stop Asian carp from spreading?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!