What does the double arrow (⇌) in a chemical equation show?
- AThe reaction is very fast
- BThe reaction releases heat
- CThe reaction needs a catalyst
- DThe reaction is reversible
What does the double arrow (⇌) in a chemical equation show?
Which element has the symbol Fe?
Charles's law describes the relationship between which two properties of a gas, at constant pressure?
What is nuclear fission?
How many moles of gas are in 44,8 L at STP (0 °C and 1 atm)?
A gas mixture contains nitrogen at 600 mmHg, oxygen at 150 mmHg and other gases at 10 mmHg. What is the total pressure?
Концентрация ионов водорода в растворе равна 1 × 10⁻⁹ моль/л. Каков его pH и является ли он кислым или основным?
In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which substance acts as the Brønsted–Lowry acid?
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