Answer:
Explanation:
The positive (protons) and negative (electrons) charges balance each other in a neutral atom, which has a net zero charge. Because protons and neutrons each have a mass of 1, the mass of an atom is equal to the number of protons and neutrons of that atom.
Explanation:
A freezing point is defined as the point in which a liquid state of a substance changes into solid state.
Whereas boiling point is defined as the point at which liquid state of substance starts to convert into vapor state.
So, a substance is freezing at 
and boils at 
then it means at room temperature, that is, around 
the substance is present in liquid state.
This is because between the freezing and boiling point a substance will always exist in liquid state.
Thus, we can conclude that state of the material at room temperature is liquid.
<span>Colbalt-60 and iodine-131 are radioactive isotopes that are used in :</span><span>(3). Medical procedures</span><span>
</span>
Answer:
3.68 g
Explanation:
= 18 ÷ 44 = 0.4
2C2H2 + 5O2 → 4CO2 + 2H2O
2 : 5 : 4 : 2
0.409 (moles)
⇒ 
= 0.409 × 2 ÷ 4 = 0.2045 moles
⇒ 
= 0.2045 × 18 = 3.68 grams
<span>it located along mid-ocean ridges where </span>tectonic<span> plates spread apart, magma rises and cools to form new crust and </span>volcanic<span> mountain chains. </span><span>.</span>
