In class quiz 2 Flashcards
What is a group of the same atoms called?
element
Some atoms have more neutrons than what the atomic number says
true
Isotope example
c13= 6 p + 7n
carbon-14 cannot hold on to all 8 neutrons in the nucleus
Carbon will kick off a neutron making c14 radioactive
How many electrons does an atom have in the first orbit around the nucleus?
2
How many electrons does an atom have in the second orbit around the nucleus?
a maximum of 8
The electrons in the outermost orbit have the most energy and are called ?
Valence electrons, these are used to make chemical bonds.
An atom with a charge is called a ?
Ion
cation
positive charge
anion
negative charge
+/- bond
ionic bond
weakest to strongest chemical bond
hydrogen, ionic, single covalent, double covalent, and triple covalent.
solid
saturated
liquid
unsaturated
bonds that share electrons between two or more elements
covalent
water is a polar covalent bond
true
between two water molecules there is a hydrogen bond
true
there are polar covalent bonds within a water molecule
true
when water breaks down, it causes charges
true
characteristics of water
cooling agent, good solvent ( dissolves like substances), water has cohesion and adhesion, hard to change the temperature of water, and can form ice.
cohesion
the ability of water molecules to stick together
adhesion
molecules are sticking to a surface
hydrogen bonds spread out and become less dense which allows ice to float
true
hot water pushes hydrogen bonds further away from each other allowing it to freeze more easily
true
