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Talja [164]
3 years ago
15

An atom has two valence electrons, but four shells. This element is a member of which group or family?

Chemistry
1 answer:
Vesna [10]3 years ago
8 0
The correct answer is C: the alkaline earth metals!
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Can atoms be created or destroyed during a chemical reaction?
ValentinkaMS [17]

Answer:

No.

Explanation:

During chemical reaction, atomes cannot be created or destroyed, they can only react together to form <em>E</em><em>l</em><em>e</em><em>m</em><em>e</em><em>n</em><em>t</em><em> </em>or <em>C</em><em>o</em><em>m</em><em>p</em><em>o</em><em>u</em><em>n</em><em>d</em><em> </em>at the <em>P</em><em>r</em><em>o</em><em>d</em><em>u</em><em>c</em><em>t</em><em> </em>side.

7 0
3 years ago
How many molecular of H2O and O2 are present in 8.5g of H2O2 ?​
Mama L [17]

2H2O+O2--->2H2O2  

8.5 gm H2O2=0.25 mole  

hence H2O is also 0.25 mole i.e.4.5 gm  

O2is 0.125 mole i.e.4 gm

4 0
3 years ago
Freezing and thawing water can cause a rock to break down into smaller pieces. Which part of the rock cycle is this an example o
zloy xaker [14]

Answer:

Deposition

Explanation:

It’s breaking down the rock :]

4 0
3 years ago
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Which will change will cause the gravitational force between a baseball and a soccerball
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Baseball has more chances




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4 0
3 years ago
The rate constant for this first‑order reaction is 0.900 s − 1 at 400 ∘ C. A ⟶ products How long, in seconds, would it take for
mafiozo [28]

Answer:

first-order reaction is 0.300 s–1 at 400 °C.. ... (in seconds) would it take for the concentration of A to decrease from 0.900 M

Explanation:

yep thats all i know

3 0
3 years ago
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