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Vilka [71]
3 years ago
11

The metals in Groups 1A, 2A, and 3A ____.

Chemistry
1 answer:
Ket [755]3 years ago
6 0
The correct answer is D.


I hope that helped! c:
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a 160 milligram sample of a radioactive isotope decays to 10 kilograms in 12 years. what is the half life of this element
Shkiper50 [21]

Answer:

3 years

Explanation:

Given data:

Initial amount of sample = 160 Kg

Amount left after 12 years = 10 Kg

Half life = ?

Solution:

at time zero = 160 Kg

1st half life = 160/2 = 80 kg

2nd half life = 80/2 = 40 kg

3rd half life = 40 / 2 = 20 kg

4th half life = 20 / 2 = 10 kg

Half life:

HL = elapsed time / half life

12 years / 4 = 3 years

8 0
3 years ago
One mole of H atom is equal to
valentina_108 [34]
16 grams I think it might be it
6 0
3 years ago
6 MARKER FOR CHEMISTRY I NEED THIS!!!​
natita [175]

Answer:

when you put the marker in the water the water gets into the marker and it will change the solid color to a plain color witch means that the marker will make the water in the cup the color from the marker.

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4 0
2 years ago
¿Un kilo y medio a cuantos gramos equivale?
Anastaziya [24]

Answer:

Por tanto, podemos concluir que en medio kilogramo hay un total de 500 gramos

7 0
2 years ago
Calculate the amount of heat required to raise the temperature of a 24 g sample of water from 9°C to 23°C.
borishaifa [10]

Answer:

1400KJ/mol⁻¹

Explanation:

Amount of heat required can be found by:

Q = m × c × ΔT

<em>Where m is the mass, c is the specific heat capacity (4.2KJ for water) and ΔT is the change in temperature.</em>

Q = 24 × 4.2 × (23 - 9)

= 24 × 4.2 × 14

=   1411.2KJ/mol⁻¹

= <u>1400KJ/mol⁻¹</u>  (to 2 significant figures)

7 0
3 years ago
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