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professor190 [17]
3 years ago
11

Can someone help me?

Chemistry
1 answer:
Natalka [10]3 years ago
8 0
Answer 19.9g. I’ve took the test last week at my uncle randy’s house
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How many moles are in 9.8 x 1024 atoms of calcium?
Ratling [72]

Explanation:

no of moles = no of atoms ÷ avogadro's number

= (9.8×10^24) ÷ (6.02×10^23)

4 0
3 years ago
A red blood cell is placed into each of the following solutions. Indicate whether crenation, hemolysis, or neither will occur. S
Burka [1]

Answer:

Solution A: crenation

Solution B: hemolysis

Solution C: hemolysis

Solution D: crenation

Solution E: crenation

Explanation:

Hemolysis is the rupturing of red blood cells, which results in the release of hemoglobin (from within the red blood cells) into the plasma. If a red blood cell is placed in a hypotonic solution, water will flow into the cell, the cell will swell and hemolysis will.

Crenation: when a red blood cell is placed in a <em>hypertonic solution (</em>such as highly saline solution), the red blood cell will lose water(osmosis) and will shrink in size. The red blood cell has undergone crenation.

In order for a red blood cell to prevent from undergoing hemolysis or crenation, the cell must be placed in an<em> isotonic solution, </em>i.e either in <u>0.9% (m/v) NaCl solution</u> or <u>5% glucose solution</u>

  • Solution B and Solution C are hypotonic solution, thus red blood cell has undergone hemolysis.
  • Solution A, D and E are hypertonic solution. thus red blood cell has undergone crenation
8 0
3 years ago
What type of bond will form between two chlorine atoms?
Trava [24]
Since both atoms are the same and are both nonmetals, they would form a Nonpolar covalent bond. This bond occurs when usually atoms of the same element or atoms of propriety electronegativity differences are sharing electrons to form bonds. There is an equal sharing of valence electrons in this chemical bond.
8 0
3 years ago
What would be the new volume if the pressure on 600ml. is increased from 90kpa to 150kpa​
dmitriy555 [2]
Mmgghjtdxj Rodney Ltd just ktdjlh
4 0
3 years ago
how do you tell if an element has positive or negative charge. And how do you know when the valence electrons have to be shared
Eva8 [605]

Answer:

A normal atom has a neutral charge. When you are missing electrons it has a positive charge. When you have extra electron, you have a negative charge. I am not sure what the answer to your second question is, sorry.

Explanation:

7 0
3 years ago
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