Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
|
What are physical and chemical changes, the differences between them? (core)
|
The change that takes place in a substance by heating it, adding water to it, or mixing it, is either a physical change or a chemical one.
|
|
|
What are the differences between elements, compounds and mixtures? (core)
|
An element contains only one kind of atom, a compound contains atoms of different elements joined together and a mixture contains more than one substance.
|
|
|
What is a mixture? (extented)
|
A mixture contains more than one substance, the substances are mixed together, not chemically combined.
|
|
|
What is an element? (extented)
|
An Element contains only one kind of atom.
|
|
|
What is a compound? (extented)
|
A compound contains atoms of different elements joined together.
|
|
|
What is the structure of an atom in terms of electrons and a nucleus containing protons and neutrons? (core)
|
Atoms consist of a nucleus and a cloud of electrons that move round the nucleus. The nucleus is itself a cluster of two kinds of particles, protons and neutrons.
|
|
|
What are the relative charges and approximate relative masses of protons, neutrons and electrons? (core)
|
The mass of protons and neutrons is 1 unit, the mass of an electron is almost nothing. Protons have a positive charge (1+), neutrons have no charge and electrons have a negative charge (1-).
|
|
|
What is the proton number? (core)
|
The proton number is the number of protons in an atom.
|
|
|
What is the nucleon number? (core)
|
The nucleon number is the total number of protons and neutrons in an atom.
|
|
|
What are isotopes? (core)
|
Isotopes are atoms of the same element, with different numbers of neutrons.
|
