PURE THINGS
I am shiny, malleable, ductile and conductive. What am I?
a metal
Graphite, charcoal and diamonds are all forms of what element?
carbon
A fire extinguisher prevents which element
from supporting a fire?
oxygen
Protons make up bigger atoms, like atoms make up bigger ___________.
molecules
Give 2 ways that salt helps make roads safer.
1. melts snow and ice
2. provides physical friction and traction
Name two elements with useful properties which are also hazardous.
lead, nickel, etc
Name two uses for diamonds, and one bad thing about diamond industry.
- drilling, cutting, lasers, jewellry
- polllution, blood diamonds
If you change the number of protons in an element, what happens?
it makes a new different element
Which are more important to the characteristic properties of an atom: the protons or the neutrons?
protons: have + charge, relate to electrons
neutrons are neutral
If you see bubbles or fire, you can be pretty sure that what kind of change is happening?
chemical
The elements grouped by the staircase of the Periodic Table belong to what group?
metalloids
Are all metals magnetic?
no
Another name for the rows going across the Periodic table is _______________
periods
The chemical formula H3O4 shows a molecule that has how many atoms in total?
7
What kind of a change is rust (physical or chemical) and how do you know? Double Down: what element is involved in making rust.
- new product formed
- oxygen
Metalloids like silicon have what real life use or application?
semiconductors
These non-metals like chlorine are very reactive gases and are found on the right hand side of the Periodic Table. What is their group name?
halogens
An element with atomic number 11 would have how many electron shells?
three: 2+8+1
If H2O is water, then H2O2 must have almost the same properties, because they share the same elements? True or false.
false
Are molecules easy to take apart, or "decompose" like a mixture? Explain.
no, because they are chemically bonded, not physically mixed
Over 90 % of all known substances
are made of elements from which general Periodic Table group ?
non-metals
Name three tests to decide if a substance is a metal.
ductility, malleability, shininess, hardness, conductivity, magentism
Name 3 kinds of information you would put on a Bohr diagram.
protons, electrons, neutrons, electron rings, nucleus
Trie or false: Chemical formulas state the type and number of molecules in each atom
of a pure substance.
false
Pure substances include both elements
and _________.
compounds