Elements
Symbol- O
Oxygen
What is the branch of science that deals with chemicals?
Chemistry
What is basic research carried out for?
The sake of increasing knowledge.
What are the fundamental building blocks of matter?
Atoms or elements
what does the bottom number mean on a periodic table cell?
atomic mass
Symbol- Fe
Iron
A bowl of nuts is an example of what type of mixture?
Heterogeneous
How many valence electrons in group 1 elements
1
What is the element of life
Carbon
name one thing the atomic number tells you
number of protons, where the element is on the p.table
Symbol- Ca
Calcium
What does organic mean in chemistry ?
Most carbon containing compounds with at least one H
What is the octet rule
rule of 8 valence electrons
21% of the atmosphere is made up of this gas
O2
What is defined as two or more different atoms chemically combined?
compound
Symbol- K
Potassium
What do physical properties scientists study?
color, texture, changes that do not alter a substance
what does covalent mean?
shares electrons
In a solution, the substance that does the dissolving
solvent
What are group 8 elements called
Noble gases
Symbol- Na
Sodium
What does CHONP stand for?
CArbon, hydrogen, oxygen, nitrogen, phospherous
What is an ionic bond?
Steals electrons
What does an endothermic reaction do with heat?
Absorbs it
Name an element that is liquid at room temperature
Bromine or Mercury