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Dmitriy789 [7]
3 years ago
10

PLEASE HELP ITS DUE TODAY

Chemistry
2 answers:
dimulka [17.4K]3 years ago
8 0

Answer:

2nd one and last one

Explanation:

im just that smart

ozzi3 years ago
7 0
Second one.
Compounds are formed by chemically combining elements. Mixtures are more physical and can be separated easily
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Which element would you expect to be more reactive: phosphorus (P) or fluorine (F)
Studentka2010 [4]

Answer:

Fluorine

Explanation:

Fluorine is the most electronegative element because it has 5 electrons in it's 2P shell.

4 0
2 years ago
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Which formula can be used to calculate the molar mass of hydrogen peroxide (H2O2)? (5 points)
ratelena [41]

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7 0
3 years ago
PLZ HELP PLZ PLZ ILL MARK AS BRAINLIESTT!!!!
LuckyWell [14K]

Q.1-

Given,

mass - 10grams

volume - 24 cm³

density = mass/volume

density = 10/24

density = 0.416 g/cm³

Q.2-

Given,

mass - 700grams

volume - 1100cm³

density = mass/volume

density = 700/1100

density = 0.6363 g/cm³

5 0
3 years ago
Thallium-207 decays exponentially with a half life of 4.5 minutes. if the initial amount of the isotope was 28 grams, how many g
Agata [3.3K]
An exponential decay law has the general form: A = Ao * e ^ (-kt) =>

A/Ao = e^(-kt)

Half-life time => A/Ao = 1/2, and t = 4.5 min

=> 1/2 = e^(-k*4.5) => ln(2) = 4.5k => k = ln(2) / 4.5 ≈ 0.154

Now replace the value of k, Ao = 28g  and t = 7 min to find how many grams of Thalium-207 will remain:

A = Ao e ^ (-kt) = 28 g * e ^( -0.154 * 7) = 9.5 g

Answer 9.5 g.
7 0
3 years ago
CAN SOMEONE PLEASE HELP MEEE :(
o-na [289]

Answer:

B

Explanation:

The water is the solvent and the sugar is the solute

Hope this helps!

5 0
3 years ago
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