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matrenka [14]
3 years ago
7

Melissa uses a sunscreen with an spf rating of 20. what does this does this mean?

Chemistry
1 answer:
Olin [163]3 years ago
4 0
If the SPF rating is 20 then it means it would provide 20 times the protection instead of no sunscreen and 20 times longer someone would take before the person started to burn or in this case 200 minutes. 
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Please show work, im really confused so please help!!
Rama09 [41]
No because the mass of the empty beaker , mass of beaker  is not balanced the amount of alcohol in the beaker.
4 0
3 years ago
When water and alcohol are mixed, the final volume is less than the total of volume of alcohol plus water added due to .......​
tigry1 [53]

Answer:

molecules take up more space

6 0
3 years ago
The chemical force for which of the following ions is directed into the cell? The chemical force for which of the following ions
Over [174]

Answer:

Both sodium and calcium.

Explanation:

The membrane potential is maintained inside and outside of the cell due to the unequal distribution of the different ions. This membrane potential difference is important for the generation of action potential.

The resting membrane potential is around +30 mV. This is due to the presence of potassium ions. The sodium and calcium ions must enter in the cell to change this membrane potential and generates the action potential in the body.

Thus, the correct answer is option (3).

5 0
3 years ago
What is the total pressure in a container with 256 mm Hg of Oz, 198 mm Hg of He,
irina1246 [14]

Answer:

P(total pressure) = 504 mmHg = 504mm/760mm/atm = 0.663 atm

Explanation:

Apply Dalton's Law of Partial Pressures.

P(total) = ∑Partial Pressures = ∑(256mm + 198mm + 48mm) = 504 mmHg

P(total pressure) = 504 mmHg = 504mm/760mm/atm = 0.663 atm

7 0
3 years ago
If an atom has 8 protons. How many electrons does it have? What is the atoms charge?
Juli2301 [7.4K]
The amount if protons is the same as the amount of electrons, so it would be 8. The charge is -2. Look at oxygen in the periodic table.
7 0
3 years ago
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