chemistry-reactive metals with water Flashcards
(15 cards)
What is produced when metals react with water?
Metal hydroxide + hydrogen gas
Examples include sodium hydroxide and potassium hydroxide.
What observable effects occur during the reaction of metals with water?
- Floats
- Fizzes/bubbles of gas
- Moves across the surface
- Produces a flame
- Disappears
These effects vary with different metals.
What happens to sodium when it reacts with water?
Disappears and forms a colourless solution
Sodium reacts vigorously with water.
What is the reaction of potassium with water?
Potassium + water → potassium hydroxide + hydrogen
Potassium reacts more vigorously than sodium.
What is produced when calcium reacts with water?
Calcium hydroxide + hydrogen
Calcium reacts with water but less vigorously than sodium and potassium.
What is the atomic number?
The number of protons in the nucleus of an atom.
What is the mass number?
The total number of protons and neutrons in the nucleus of an atom.
What defines an isotope?
Atoms with the same atomic number but a different mass number.
What is the relationship between the number of protons and the atomic number?
Number of protons = atomic number.
What are diatomic molecules?
Two atoms covalently bonded in a molecule
Examples include H2, N2, O2.
What are compounds?
A substance formed when two or more elements are chemically combined.
What is the state symbol for a solid in chemical equations?
(s)
What is the state symbol for a liquid in chemical equations?
(l)
What is the state symbol for a gas in chemical equations?
(g)
What is the state symbol for an aqueous solution in chemical equations?
(aq)
