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
7nadin3 [17]
3 years ago
11

An example of a pure substance is ____.

Chemistry
1 answer:
Vsevolod [243]3 years ago
6 0

Answer: e) all of these

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Copper

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water  (H_2O), carbon dioxide (CO_2)

Mixtures are not pure substances as they consist of elements and compounds combined physically and not in any fixed ratio. Example: Air

Thus all given substances are pure substances.

You might be interested in
Which atom loses 2 electrons while forming an ion?
BabaBlast [244]

Answer:

it would be a cation ... i believe

Explanation:

To become a cation, a positively charged ion, an atom would have to lose at least two electrons  

7 0
3 years ago
Addition of _____________ to pure water causes the greatest increase in conductivity.
SOVA2 [1]
I think it’s an ionic compound? An example is salt because water breaks it up due to the polar bonds.
NaCl = [Na+] + [Cl-]
Those conduct electricity.
7 0
3 years ago
A sample of gas occupies 17 mL at –112°C. What volume does the sample occupy at 70°C?
Snowcat [4.5K]

final answer is

V

2

=

4

×

10

1

 

mL

8 0
3 years ago
I need help in chemistry 10th grade (sophomore)
Goryan [66]

Answer:

1) 2

2)4

3)5

4)2

5)2

6)1

7)3

8)5

9)4

10)4

11)3

12)5

13)6

14)2

15)2

16)1

17)2

3 0
3 years ago
Read 2 more answers
What is the energy required to change a spherical drop of water to five smaller spherical drops of equal size? At room temperatu
pav-90 [236]
T<span>his is a straightforward question related to the surface energy of the droplet. </span>

<span>You know the surface area of a sphere is 4π r² and its volume is (4/3) π r³. </span>

<span>With a diameter of 1.4 mm you have an original droplet with a radius of 0.7 mm so the surface area is roughly 6.16 mm² (0.00000616 m²) and the volume is roughly 1.438 mm³. </span>

<span>The total surface energy of the original droplet is 0.00000616 * 72 ~ 0.00044 mJ </span>

<span>The five smaller droplets need to have the same volume as the original. Therefore </span>

<span>5 V = 1.438 mm³ so the volume of one of the smaller spheres is 1.438/5 = 0.287 mm³. </span>

<span>Since this smaller volume still has the volume (4/3) π r³ then r = cube_root(0.287/(4/3) π) = cube_root(4.39) = 0.4 mm. </span>

<span>Each of the smaller droplets has a surface area of 4π r² = 2 mm² or 0.0000002 m². </span>

<span>The surface energy of the 5 smaller droplets is then 5 * 0.000002 * 72.0 = 0.00072 mJ </span>
<span>From this radius the surface energy of all smaller droplets is 0.00072 and the difference in energy is 0.00072- 0.00044 mJ = 0.00028 mJ. </span>

<span>Therefore you need roughly 0.00028 mJ or 0.28 µJ of energy to change a spherical droplet of water of diameter 1.4 mm into 5 identical smaller droplets. </span>
3 0
3 years ago
Other questions:
  • Calculate the volume of the chlorine that would be required to react completely with 3.70g of dry slaked lime according to the e
    5·1 answer
  • If 72.1 mL of 0.543 M H2SO4 completely titrates 39.0 mL of KOH solution, what is the molarity of the KOH solution? a. 0.317 M b.
    15·1 answer
  • The azide ion, n−3, is a symmetrical ion, all of whose contributing structures have formal charges. draw three important contrib
    7·2 answers
  • A balloon originally had a volume of 4.39 l at 44°c and a pressure of 729 torr. to what temperature must the balloon be cooled t
    11·2 answers
  • What did ancient astronomers think areas of the moon called mares might be?
    11·1 answer
  • Help asap<br> 25.0 g Na =____ atoms Na
    14·1 answer
  • Why are atoms attracted to each other in an ionic bond?
    15·2 answers
  • A tennis ball is thrown straight up with an initial speed of 20 m/s.  How long does it take to reach the top of the flight?
    5·1 answer
  • In a paragraph explain the energy flow and the process of how a sedimentary rock change into a metamorphic rock.
    6·1 answer
  • 3. Calculate the mass of NH3 that can be produced from the reaction of 125 g of NCI:
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!