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irina1246 [14]
3 years ago
14

Are eye drops a base or acid???

Chemistry
1 answer:
gregori [183]3 years ago
3 0

base

bye hope you have a good day

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An atom has two valence electrons, but four shells. This element is a member of which group or family?
Vesna [10]
The correct answer is C: the alkaline earth metals!
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2 years ago
How many electrons in the 4 and 5th shell?
patriot [66]
The fifth shell can hold up to 50 electrons and the forth shell can hold 8 electrons 
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2 years ago
An aqueous solution is listed as being 33.8% solute by mass with a density of 1.15 g/mL, the molar mass of the solute is 145.6 g
vodomira [7]

Answer:

A) 2.69 M

B) 0.059

Explanation:

A) We have:

33.8% solute by mass= 33.8 g solute/100 g solution

molarity = mol solute/ 1 L solution

molarity= \frac{33.8 g solute}{100 g solution} x \frac{1.15 g solution}{1 ml} x \frac{1 mol solute}{145.6 g solute} x \frac{1000 ml}{1 L}

molarity= 2.69 mol solute/L solution = 2.69 M

B) We know that there are 33.8 g of solute in 100 g of solution.

As the total solution is compounded by solute+solvent (in this case, solvent is water), the mass of water is the difference between the mass of the total solution and the mass of solute:

mass of water= 100 g - 33.8 g = 66.2 g

Now, we calculate the number of mol of both solute and water:

mol solute= 33.8 g solute x \frac{1 mol solute}{145.6 g} = 0.232 mol

mol H20= 66.2 g H₂O x \frac{1 mol H2O}{18 g}

Finally, the mol fraction of solute (Xsolute) is calculated as follows:

Xsolute=\frac{mol solute}{total mol}= \frac{mol solute}{mol solute + mol H2O}=\frac{0.232 mol}{0.232 mol + 3.677 mol}

Xsolute= 0.059

4 0
2 years ago
Make a diagram showing how communication satellites could be used to relay
alexdok [17]

Answer:

Explanation:

Satellite acts as a relay station for earth sources. A transmission station sends the information to the satellite, which in turn retransmits to the receiving stations. The original signal being transmitted from the earth station to the satellite is called uplink of 6 GHz The retransmitted signal from the satellite to the receiving station is called downlink of 4 GH frequency. The transponder is the transmitter-receiver combination in a transponder.

6 0
3 years ago
How many electrons are in the 2p sub-energy level of a neutral nitrogen atom?
Evgen [1.6K]

Answer:

<h3>C. 3</h3>

Explanation:

there are three electrons in a 2p sub-energy level of s neutral nitrogen atom.

8 0
3 years ago
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