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
AfilCa [17]
3 years ago
5

Archer is a soil scientist and needs to examine a bacteria sample. He wants to be able to change his magnification with differen

t objective lenses. Which microscope should he choose?
A. Compound light microscope
B. Transmission electron microscope
C. Dissecting microscope
D. Scanning electron microscope
Chemistry
1 answer:
koban [17]3 years ago
3 0

Answer:

C. Dissecting microscope

Explanation:

It is trying to see the surface

You might be interested in
The chemical symbol for a calcium ion is ca2 . what does the 2 symbolize
Blababa [14]
2 stands for valency of ca ion

its +2

that it takes two electrons to complete its shell
8 0
2 years ago
Please help me with this basic organic conversion.<br>use the shortest way to do it​
jonny [76]

Answer:

See explanation

Explanation:

This conversion must go through a sequence of steps as i have shown in the image attached to this answer.

The acetone is converted to propan-2-ol using LiAlH4, THF and acid. The  propan-2-ol may be converted to propene by E2 elimination. Addition of HBr yields 2-bromo propane.

The Wurtz reaction converts 2-bromo propane to 2,3- dimethyl butane. This can be brominated in the presence of light to yield 3-bromo-2,3-dimethyl butane. Elimination of HBr using a base leads to the formation of the required product as shown.

7 0
2 years ago
Can someone help me with questions 4-5 <br> 21 points
sp2606 [1]

4. describe three ways carbon dioxide was removed from the Earth's atmosphere.

Answer: Forests: Photosynthisis helps clear carbon dioxide naturally, Soils naturally store carbon, but agricultural soils are running a big deficit due to intensive use. Because agricultural land is so expansive, Bio-energy with Carbon Capture and Storage (BECCS) is another way to use photosynthesis to combat climate change. However, it is far more complicated than planting trees or managing soils — and it doesn’t always work for the climate.

5. Explain why there is now 21% Oxygen in the Earth's atomosphere compaired to little or no Oxygen in the Earth's atmosphere 4.5 billion years ago.

Answer: cientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence.The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.

Sorry its soooo long TwT

8 0
3 years ago
¿Cuál era su juego favorito cuando eran niños?​
blagie [28]

Answer:

mi juego favorito probablemente sería Mine craft cuando era más joven, aunque sigue siendo uno de mis juegos favoritos

Explanation:

7 0
3 years ago
A chemistry student weighs out 0.027 kg of an unknown solid compound X and adds it to 550. mL of distilled water at 30.° C. Afte
QveST [7]

Answer:

1. Yes

2.The solubility of X is 34.55g/L

Explanation:

Solubility of  solute refers to how readily a solute will dissolve in a solvent at a particular temperature. Its the amount of moles or grams required to saturate 1dm^{3} or 1 Litre of water.

From the problem, when the liquid was drained off and amount of X which didn't dissolve was measured, it weighed 0.008kg, this means out of 0.027kg, 0.027-0.008 actually dissolved

= 0.019kg*1000 = 19g.

if 19g is required to saturate 550mL at 30°C,

then\frac{19*1000}{550} will saturate 1L

= 34.545g  will saturate 1Litre

The solubility thus is 34.55g/L

 

5 0
3 years ago
Other questions:
  • An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation
    11·1 answer
  • Which of the following phase changes is an exothermic change?
    10·2 answers
  • If a liquid has a density of 0.785, then any object with _____ density will float.
    11·1 answer
  • Write the chemical equation for the equilibrium that corresponds to Ka. Write the chemical equation for the equilibrium that cor
    11·1 answer
  • What is the predicited order of first ionization energies from highest to lowest for lithium sodium potassium and rubidium
    7·1 answer
  • All cells _____.
    15·1 answer
  • Fine-grainted igneous rocks form?
    7·1 answer
  • How many atoms are in two water molecules? pls and thxxxxxxxxx
    9·1 answer
  • I need help. like right now. so ya. help plz. thx
    12·1 answer
  • An atom has 10 total electrons. How would you describe the reactivity of
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!