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3 years ago

What is radioactivity.

1 answer:

5 0

Radioactivity another name for radioactive decay. Radioactivity refers to particles emitted from nuclei as a result of nuclear instability.

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One advantage to using nuclear power is —

yaroslaw [1]

It produces no air pollution

5 0

3 years ago

Read 2 more answers

Percent composition identifies the amount (in percent) of each element present in a compound.

bagirrra123 [75]

I believe the answer you are looking for is TRUE!

Forgive me if I am incorrect, hope I helped you out!

Have a great day.

8 0

3 years ago

when 0.863 mol acetone is dissolved in 500 g benzene, the freezing point of benzene drops 8.84°C. what is the molal freezing poi

sveticcg [70]

Answer:

Kf = 5.12 °C/m

Explanation:

1) Data:

a) Solute: acetone

b) Solvent: benzene

c) n (solute) = 0.863 mol

d) mass of solvent = 500 g = 0.500 Kg

e) ΔTf = 8.84 °C

f) Kf = ?

2) Formulae:

Depression of freezing point: ΔTf = m . Kf

Molality: m = n (solute) / kg solvent

3) Solution:

a) m = 0.863 mol / 0.500 kg = 1.726 m

b) Kf = ΔTf / m = 8.84°C / 1.726 m = 5.12 °C/m ← answer

3 0

3 years ago

The mass percent of Cl⁻ in a seawater sample is determined by titrating 25.00 mL of seawater with AgNO₃ solution, causing a prec

Serga [27]

Answer:

2.5 %

Explanation:

Considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

Or,

$Moles =Molarity \times {Volume\ of\ the\ solution}$

Given :

For $AgNO_3$ :

Molarity = 0.2850 M

Volume = 63.30 mL

The conversion of mL to L is shown below:

1 mL = 10⁻³ L

Thus, volume = 63.30 × 10⁻³ L

Thus, moles of $AgNO_3$ :

$Moles=0.2850 \times {63.30\times 10^{-3}}\ moles$

Moles of $AgNO_3$ = 0.0180405 moles

Moles of $AgNO_3$ = Moles of $Cl^-$

Thus, Moles of $Cl^-$ = 0.0180405 moles

Molar mass of $Cl^-$ = 35.453 g/mol

Mass = Moles * Molar mass = 0.0180405 moles * 35.453 g/mol = 0.6396 g

Volume of sea water = 25.00 mL

Density = 1.024 g/mL

Density = Mass / Volume

Mass = Density * Volume = 1.024 g/mL * 25.00 mL = 25.6 g

$Mass\ \%=\frac{Mass_{Chloride ion}}{Total\ mass}\times 100$

$Mass\ \%=\frac{0.6396}{25.6}\times 100$

Mass percent of Cl⁻ = 2.5 %

4 0

3 years ago

Marveldude pls repost what u said it got deleted :/

ad-work [718]

Answer:

position: one compound becomes 2 separate elements

synthesis: two seperate elements combining into 1 compound

single replacement: a separate element and compound switch a component

double displacement: two compounds switch elements

this is just kinda restating what red text said but this is simpler ig

5 0

3 years ago