Atoms & Periodic Table
What is the smallest particle of an element that still has the properties of that element?
An atom.
Which type of bonding happens between a metal and a non-metal?
Ionic bonding.
Is salt water a compound or a mixture?
Mixture
What are the substances at the beginning of a chemical reaction called?
Reactants.
What pH number is neutral?
7
Name the three main particles inside an atom an their charges.
Protons - positive, neutrons - neutral, and electrons - negative.
In covalent bonding, atoms share something. What do they share?
Electrons.
Is water, H₂O, a compound or a mixture?
Compound
What are the substances made in a chemical reaction called?
Products.
Is lemon juice acidic, basic, or neutral?
Acidic.
An atom has 6 protons. Which element is it?
Carbon.
What type of bonding is found in metals?
Metallic bonding.
Melting ice is what type of change: physical or chemical?
Physical
Balance this equation: H₂ + O₂ → H₂O
2H₂ + O₂ → 2H₂O
What colour does universal indicator usually show in acids?
Red, orange, or yellow.
Why are elements in the same group of the periodic table chemically similar?
They have the same number of outer-shell / valence electrons.
Why can metals conduct electricity?
Because they have free / delocalized electrons that can move.
Burning paper is what type of change: physical or chemical?
Chemical change.
What type of reaction is this? A + B → AB
Synthesis / combination reaction.
What are the products of acid + base?
Salt and water.
Why are elements in the same period of the periodic table chemically similar?
They have the same number of shells.
Compare ionic and covalent bonding in one sentence.
Ionic bonding transfers electrons, while covalent bonding shares electrons.
Give two signs that a chemical reaction may be happening.
Possible answers:
Balance this equation:
Mg + O₂ → MgO
2Mg + O₂ → 2MgO
What type of reaction is this?
HCl + NaOH → NaCl + H₂O
Neutralization reaction.