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Aleks04 [339]
4 years ago
9

How could you separate a mixture of rocks and sand?

Chemistry
1 answer:
ryzh [129]4 years ago
3 0
To separate a mixture of rocks and sand I think water will be the best option to break it down
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Please help! What is the molarity of 450 mL of solution containing 15 g NaCl?
siniylev [52]

Answer:

The answer to your question is 0.6 M

Explanation:

Data

Molarity = ?

Volume = 450 ml

mass of NaCl = 15 g

Process

1.- Calculate the molar mass of NaCl

NaCl = 23 + 35.5 = 58.5 g

2.- Calculate the number of moles of NaCl

             58.5 g of NaCl ------------ 1mol

                 15 g of NaCl ------------   x

                         x = (15 x 1)/58.5

                         x = 0.26 moles

3.- Calculate the molarity

Molarity = moles/volume

-Substitutiion

Molarity = 0.26/0.45l

-Result

Molarity = 0.6 M

7 0
4 years ago
Which best describes the role of a secondary consumer in a food web?
Mamont248 [21]
Secondary consumers in a food web are carnivores that feed on primary consumers. Consumers are organisms that receive energy by eating other organisms. Specifically, primary consumers are those that feed on producers. Producers are those that are able to produce their own food, like plants. Meanwhile, secondary consumers, like humans, eat primary consumers such as cows. 
3 0
4 years ago
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What is Equilibrium? I’m a little confused on the topic. You’ll get a lot of points if you answer I think.
AleksAgata [21]

Answer:

to put it simply, equilibrium is when two opposing forces balance each other out. one example is boats: you know how the bottom half is curved, and then meets at an edge? they design it like that because of water displacement. by gravity, the water wants to go back to the area taken by the boats mass (the parts where it has sunken into the water), thus preventing the boat from sinking. once the boat is removed, the water returns to the space. most liquids take form of their container.

8 0
3 years ago
Sea, sand, sky, palms – made almost all of
andrezito [222]

Answer:

sup

Explanation:

3 0
3 years ago
In certain conditions, hydrogen gas produces the emission spectra shown below. What causes the bright lines seen in the spectra?
rusak2 [61]

Answer:

a bright line spectrum is prodecued when an electron falls from a higher energy state

Explanation:

not sure if this is the exact answer you're looking for but it should be similar

7 0
3 years ago
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