Qs 1-5
The smallest unit of matter that cannot be broken down by ordinary means is the...?
Atom
where in the atom are protons found
the nucleus
what is a family or group on a periodic table?
column
What is a chemical change?
a change that occurs to matter and a new substance is creating; burning paper=ash created
Neutrons have a...charge.
neutral
where in the atom are neutrons found?
the nucleus
What types of things do every element in a family have in common?
All elements in a family have similar physical properties.
gas bubbles
when there are gas bubbles, this shows a new gas was created that wasn't there before.
electrons have a...charge.
negative
how many natural elements are there on the periodic table?
109
On a periodic table, what is a period?
row
temperature change
occurs without heating or cooling equipment
protons have a...charge.
positive
an element's atomic number shows the number of...in the nucleus.
protons
the periodic table is organized so each element's...can be predicted by its...on the table
properties, position
what does the law of conservation of mass mean?
the same amount of matter that exists before and after the chemical reaction
electrons are organized in...around the nucleus
energy levels
an element's atomic mass is the number of...plus the number of...in the nucleus of one atom of that element.
neutrons, protons
What is a physical change?
a change that occurs to matter but does not create a new substance; Ripping tearing paper, bending nail.