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3 years ago

Which radioactive isotope is used in treating cancer?

Chemistry

1 answer:

Cerrena [4.2K]3 years ago

8 0

I think it is B.Cobalt-60 hope its right

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When an electron is displaced in a semi conductor, the hole that’s left behind is?

lisov135 [29]

Explanation:

holes are left due to space left out the migrating electrons. they are positive charge carriers. if the electron moves in one direction, the holes appear to move in the opposite direction.

6 0

3 years ago

As the concentration of hydrogen ions in solution increases, what happens to the pH? 1.Fluctuates up and down 2.stays the same 3

bonufazy [111]

3. Decreases
The concentration of hydrogen ions increasing creates an acid, which is 7 or below on the pH scale. If the pH value lessens from 7 to create an acid, that would mean it decreases.

8 0

3 years ago

Read 2 more answers

Write a mechanism for the formation of triphenylmethanol from the reaction of phenylmagnesium bromide and diethyl carbonate..

My name is Ann [436]

The reaction proceeds through nucleophilic acyl substitution reaction.

Phenyl magnesium bromide substitutes one ethoxide ion in the nucleophilic acyl substitution reaction that drives the process forward. A subsequent equivalent of phenyl magnesium bromide produces triphenyl methanol through a nucleophilic addition reaction with the resultant keto group.

There are two ethoxy leaving groups in diethyl carbonate. Tertiary alcohol is created when diethyl carbonate combines with too much Grignard reagent. The Grignard reagent attacks the carbonyl carbon three times in the mechanism to produce the tertiary alcohol.

The mechanism is shown below:

Learn more about Grignard reagent here:

brainly.com/question/14702056

#SPJ4

5 0

1 year ago

The hardness of water (hardness count )is usually expressed in parts per million(by Mass) CaCO3, which is equivalent to milligra

Ksju [112]

Answer:

1.75 × 10⁻³ M

Explanation:

Given:

Hardness = 175 mg CaCO₃/L

or mass of CaCO₃ in 1 L = 175 × 10⁻³ grams

Now,

Molar mass of CaCO₃ = 40 + 12 + ( 3 × 12 ) = 100 grams/mol

The concentration of CaCO₃ = number of moles / volume

= (175 × 10⁻³ / 100) / 1

= 1.75 × 10⁻³ M

Now,

CaCO₃ ⇒ Ca²⁺ + CO₃²⁻

1.75 × 10⁻³ M 1.75 × 10⁻³ M 1.75 × 10⁻³ M

thus,

the concentration of Ca²⁺ ions in water = 1.75 × 10⁻³ M

4 0

3 years ago

What are polymers?

const2013 [10]

Personally, I would chose #1-Long chains of carbon molecules

3 0

3 years ago