Answer:
a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
"chlorine acts as a catalyst promoting the breakdown of ozone"
Explanation:
your welcome!
Answer:
Br⁻, Be²⁺, Li⁺ , O²⁻, N³⁻
Explanation:
Ions are formed when an atom lose or gain the electrons.
There are two types of ions.
Cations and anions
Cations:
When an atom lose the electron cations are formed and atom gain positive charge.
X → X⁺ + 1e⁻
Anion:
When an atom gain electron anion is formed and atom gain negative charge,
X + 1e⁻ → X⁻
In given list of elements Li and Be form positive ions because they easily lose their valance electrons.
Li → Li⁺ + 1e⁻
Be → Be²⁺ + 2e⁻
While oxygen, nitrogen and bromine gain the electrons easily to complete the octet and form negative ions.
Br + 1e⁻ → Br⁻
O + 2e⁻ → O²⁻
N + 3e⁻ → N³⁻
Lava is your answer.
Lava is molten rock that is spewed from a volcano when in eruption. Once cooled and hardened (usually through long periods of time or with contact to large bodies of water), the lava would harden and mix with other materials, allowing it to form into igneous rocks.
hope this helps
Answer:
Iodide concentration: 0.02M I⁻
Persulfate concentration: 0.02M S₂O₈²⁻
Explanation:
In chemistry, a dilution is the process in which the concentration of solute is reduced by addition of more solvent.
Iodide (KI → I⁻), has a concentration of 0.20M. If you add 5mL resulting in a final volume of 50mL, the final concentration decreases in:
0.20M × (5mL /50mL) = <em>0.02M I⁻</em>
The persulfate ion (K₂S₂O₈ → S₂O₈²⁻) has a concentration of 0.10M in 10mL that result in a final volume of 50mL. That means final concentration is:
0.10M × (10mL /50mL) = <em>0.02M S₂O₈²⁻</em>
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I hope it helps!