Answer:
A
Explanation:
Hot air is less dense therefore it rises. Cold air is more closely packed therefore it is more dense. Less dense things rise while more dense things sink.
Answer:
Sodium bicarbonate.
Explanation:
The gas produced during the mixing of bath bombs in water is Sodium bicarbonate. If the reaction is with citric acid then Sodium citrate can be produced. They are weak acid with bicarbonate base. These bath bombs can be a mixture of wet and dry substances and any shape can be mold.
Answer:
(a) ¹⁴₆ C ⇒ ¹⁴₇ N + ⁰₋₁ e
(b) ¹⁴⁰₅₅ Cs ⇒ ¹⁴⁰₅₆ Ba + ⁰₋₁ e
(c) ²³⁴₉₀ Th ⇒ ²³⁴₉₁ Pa + ⁰₋₁ e
Explanation:
In a beta decay the nuclide emits a beta particle which are high enery electrons. The number of neutrons decreases by one and the atomic number increases also by one moving the nuclide one place to the right in the periodic table. The mass of the nuclide does not change since the mass of electron is negligible compared to the proton and neutron.
(a) ¹⁴₆ C ⇒ ¹⁴₇ N + ⁰₋₁ e
(b) ¹⁴⁰₅₅ Cs ⇒ ¹⁴⁰₅₆ Ba + ⁰₋₁ e
(c) ²³⁴₉₀ Th ⇒ ²³⁴₉₁ Pa + ⁰₋₁ e
