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4 years ago

What is the origin of the name for bismuth

Chemistry

1 answer:

Juliette [100K]4 years ago

6 0

The name come from the German 'Bisemutum' a corruption of 'Weisse Masse' meaning white mass.

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If the half life of a radioactive isotope is 1 day, then how much of the original isotope remains at the end of two days?

ikadub [295]

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25%

Explanation:

In a half life of a radioactive isotope is 1 day,it means it loses its half mass each day

We a formula for N half life

$\sf { \frac{1}{2} }^{n}$

where n is the number of days

Here the isotope is kept for 2 days

so it's left over mass will be

$\sf { (\frac{1}{2}) }^{2} \\ \\ \\ \frac{1}{2} \times \frac{1}{2} \\ \\ \sf \frac{1}{4}$

It's left over mass 1/4th of the original mass

Now, we need to find it's percentage by multiplying with 100

$\sf \frac{1}{4} \times 100 \%\\ \\ \sf \cancel\frac{100}{4} \% \\ \\ \sf 25\%$

So 25% mass will be left after 2 day of half life radioactive isotope.

8 0

2 years ago

Read 2 more answers

Question 1 (1 point)

lilavasa [31]

Answer:

I believe the answer is C. Stopping an object from moving

4 0

3 years ago

A 3.00 L flexible container holds a sample of hydrogen gas at 153 kPa.

Lisa [10]

The volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L (option B).

<h3>How to calculate volume?</h3>

The volume of a substance can be calculated using the following formula:

P1V1 = P2V2

Where;

P1 = initial pressure
P2 = final pressure
V1 = initial volume
V2 = final volume

153 × 3 = 304 × V2

459 = 304V2

V2 = 459/304

V2 = 1.51L

Therefore, the volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L.

Learn more about volume at: brainly.com/question/2098026

#SPJ1

8 0

2 years ago

In the reaction K2CrO4(aq) + PbCl2(aq) → 2KCl(aq) + PbCrO4(s), how many grams of PbCrO4 will precipitate out from the reaction b

Elodia [21]

The balanced chemical reaction is:

K2CrO4(aq) + PbCl2(aq) → 2KCl(aq) + PbCrO4(s)

We are given the amount of the reactants to be used for the reaction. These amounts will be the starting point of our calculations.

3.0 M K2CrO4 (.500 L) = 1.5 mol K2CrO4

1.5 mol K2CrO4 (1 mol PbCrO4 / 1 mol K2CrO4) ( 323.2 g/mol)=484.8 grams PbCrO4

Therefore, the best answer from the choices is 480 grams.

7 0

3 years ago

The net ionic equation for the reaction between aqueous solutions of hf and koh is ________.

choli [55]

Answer:

The net ionic equation for the reaction between aqueous solutions of hf and koh is H⁺ + OH⁻ → H₂O (l)

Explanation:

This is the complete reaction:

HF (aq)+ KOH (aq) → KF (aq) + H₂O (l)

Hydrofluoric acid dissociates according to this equation:

HF → H⁺ + F⁻

And we get protons plus fluorides.

Sodium hydroxide dissociates into:

KOH → K⁺ + OH⁻

potassium cation and hydroxyls.

First of all, the aqueous compounds must be separated into their ions.

Aqueous are the only one, you can break apart.

Don't forget to establish solubility in the compounds. For this case no one is soluble in water.

We make the complete ionic equation with all the aqueous compounds:

H⁺ + F⁻ + K⁺ + OH⁻ → F⁻ + K⁺

and afterwards, cancel the ions that are repeat on reactant and product sides. This are the spectator ions.

As we eliminate F⁻ + K, the net ionic equation will be:

H⁺ + OH⁻ → H₂O (l)

7 0

3 years ago