Biology vocab 6-3/random stuff/foldable questions Flashcards
polar molecule
molecules that have an uneven distribution of charges (oppositely charged regions)
mixture definition
a combination of 2 or more substances in which each substance retains its individual characteristics and properties
solvent
a substance in which another substance is dissolved
solute
the substance that is dissolved in the solvent
acid definition
substances that release hydrogen ions when dissolved in water
base definition
substances that release hydroxide ions when dissolved in water
pH
the measure of concentration in H+ in a solution
buffer
mixtures that can react with acids or bases to keep the pH within a particular range
what is polarity+give an example
the property of having two opposite poles (ends) ex: magnet
homogeneous mixture definition
everything will appear the same throughout
what are the 2 parts of a solution
a solute and a solvent
heterogeneous mixtures definition
everything will appear different throughout
polar molecules will…
always attract other polar molecules
polar will…
repel non-polar
mixtures are…
physically combined, so they can be physically separated
3 exs. of homogeneous mixture
koolaid,water, soda
whats another name for a homogeneous mixture
solution
is water a polar molecule? describe how water will act with other polar molecules
yes, water will attract other polar molecules
what are solutions
homogeneous mixtures formed when a solute is dissolved in a solvent
3 exs. of heterogeneous mixtures
blood, salad, sand
what happens to the H+ ion and OH- ion when you move them from 14-0 on the pH scale
the number of OH- will decrease and the number of H+ will increase from 0-14
compare and contrast solutions and suspensions
solutions are a homogeneous mixture while suspensions are heterogeneous
the stronger the acid the more…
H+ are released
the stronger the base the more…
OH- are released
how does water help maintain homeostasis
sweat, blood
why is baking soda basic
it raises pH
why don’t polar and non-polar molecules attract
the polar molecules have a stronger bond, while non-polar molecules have a weak bond
give 4 ex. of acids and their pH value
tomatoes (4), rain (5), battery acid (0), lemon juice (2)
give 4 ex. of bases and their pH value
sodium hydroxide (-4), sea water (10), baking soda (9), oven cleaner (13)
name and describe the 4 macromolecules
carbohydrates provide short term energy and cell structural support, lipids (fats) provide long term energy and barriers for the cell, proteins build and repair cells, make hormones, and provide structural support, and nucleic acids store and transmit genetic information
why are steroids important
they help you grow, support homeostasis, and support metabolism
what is a nucleotide and name the 3 major units that make them up
it makes up DNA and RNA. Phosphate, nitrogenous base, and ribose sugar
