Atom
The negative charged particles of an atom are called ...
electrons
What element has chemical symbol of H?
Hydrogen
Group of two or more atoms make up a ...
molecule
What is the chemical abbreviation of water?
H20
A connection between two atoms is called a
chemical bond
What are three types of particles atom is made of?
protons, neutrons and electrons
All chemical elements are organized in a …
Periodic Table of Elements
Which process is expressed by this equation?
6CO2 + 6H2O → C6H12O6 + 6O2
photosynthesis
True or False - water is inorganic compound?
True
What is matter?
Anything that has mass and takes up space
Which subatomic particles are in the nucleus of an atom?
protons and neutrons
What is NaCl?
Where can you find the reactants in a chemical equation? e.g. 2Na + Cl2 --> 2NaCl
On theleft side
2Na + Cl2
Water and salt mix evenly and therefore create a
solution
Macromolecules or organic compounds consist of 5 basic elements. The elements are:
Hydrogen, Oxygen, Carbon, Nitrogen, and Phosphorus
What is the difference between number of electrons and number of protons in a neutrally charged atom?
There is no difference.
electrons = protons
What is a definition of a compound?
a substance containing different elements e.g. H20
What does the coefficient in front of a substance in a chemical equation tells us? e.g. 6CO2
The number of molecules
e.g. 6 carbon dioxides
Why do we call water a universal solvent?
Water dissolves more substances than any other chemical.
A substance's mass per unit of volume is called
density
What do you call an atom that is either positively or negatively charged?
ion
What does the atomic number of an element in the periodic table mean? E.g. Helium has number 2
Number of protons in the nucleus
Why are the chemical equations always balanced?
Atoms are neither created nor destroyed so all the reactants on left side must equal to products on right side. (Law of Conservation of Matter)
How does water change with temperature and why is it good for living organisms?
Water reacts very slowly to temperature and therefore keeps homeostasis = stable internal environment in living organisms
The amount of a substance in a defined volume (grams per liter) is called
concentration