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2 years ago

Plz answer I don't get this!!!

Chemistry

1 answer:

Romashka [77]2 years ago

5 0

Didn't you review it in School?

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When Earth’s axis points away from the sun, the _________ Hemisphere has the longer days of summer.

Llana [10]

Answer: northern hemisphere

Explanation: I looked it up. Plus I took a test with this question and when the teacher went over the answer i got it right.

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2 years ago

PLEASE HELP! (8.01 MC)

Maslowich

Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.

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2 years ago

Explain why indicators are useful for measuring pH

ycow [4]

Explanation:

pH indicators are weak acids that exist as natural dyes and indicate the concentration of H+ (H3O+) ions in a solution via color change. A pH value is determined from the negative logarithm of this concentration and is used to indicate the acidic, basic, or neutral character of the substance you are testing.

8 0

2 years ago

1.505 times 10^23 Na atoms

dybincka [34]

5.75g

Explanation:

Given parameters:

Number of atoms = 1.505 x 10²³atoms

let us find the number of moles and mass of this atom.

Solution:

The mole is convenient unit for reporting measurements in chemistry. It allows us to make mathematical calculations:

one mole of substance contains 6.02 x 10²³atoms

Number of moles of Na given = $\frac{1.505 x 10^{23} }{6.02 x 10^{23} }$ = 0.25moles

Mass of Na atom given = number of moles x molar mass

Molar mass of Na= 23g/mole

Mass of Na = 0.25 x 23 = 5.75g

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

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2 years ago

What contribution did J.J. Thomson make to the development of atomic theory?

max2010maxim [7]

Answer:

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2 years ago