Bio Ch2 Flashcards
What are isotopes
Atoms of the same element that differ in number of neutrons.
What are SI Units? Examples?
a system of physical units ( SI Units ) based on the meter, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten.
How do you find the atomic number of an atom? Atomic mass?
The number of protons in the nucleus of an atom determines an element’s atomic number. 4N 3P
What are the parts that make up an atom, how are they related, and their location is
Protons, neutrons, and elections protons and Neutrons have the same mass. Their located in the center of the atom
What is the difference between covalent, hydrogen, and ionic bonds? How are they formed?
Ionic bonds are formed when one or more electrons are transferred from one atom to another. Ionic bonds form between sodium and chlorine in table salt.
Covalent bonds forms when electrons are shared between atoms. When the atoms share two electrons, the bond is called a covalent bond.
Hydrogen bonds are electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as O2 and nitrogen. Formed between positive and negative poles.
What are the basic properties of water
Polar
Define solution and suspension
Solution is composed of a solvent and a solute.
Suspension is the state in which the partials of a substance are disappeared but not totally dissolved in a fluid.
What is is pH? What is the pH of an acid and a base?
The pH is a measure of the hydrogen ion concentration.
The pH of acid is If the number is lower than 7 it is an acid
The pH of base is that if the number is above 7 them it is a base
What are the four organic compounds of living g things ?
The 4 organic compounds are carbohydrates, lipids, proteins, and nuclear acid
