Compounds
a compound is composed of two or more______________ chemically combined together
Elements
Why are the elements Li, Na, and K similar?
they are all in the same group 1. each are highly reactive with one electron
acids have a ph of ____-____ (numbers)
0-6
Bases have a pH number of ______ to _____
8-14
what is the pH of a neutral solution?
7
How many elements are within the compound C12H22O11 (sucrose)
3: Carbon, Hydrogen, Oxygen
why are the elements F, Cl, and Br similar?
they are all in the same group, 17 with 7 valence electrons.
RED
bases turn litmus paper what color???
BLUE
if you add acid to a basic solution, what will happen to the pH number?
it will decrease from a basic number to a lower number: EX 10-7
how many elements are in C6H8O7? (citric acid)
3: carbon, Hydrogen, Oxygen
what physical property is used to specifically organize the periodic table?
metals/ non metals
what color does a pH indicator strip turn when dipped into an acid?
red, orange, yellow
what color does a pH indicator strip turn when its dipped into a base?
What color does a pH indicator stirp turn, when dipped into a neutral solution?
green
how many elements are in the compound HClO3
3: Hydrogen, chlorine, oxygen
what is a metalloid?
Has properties of both metals and non metals
litmus paper always turns what color with an acid?
RED
list these solutions from the LEAST to MOST basic
Lemon juice- pH of 2
Water- pH of 7
Ammonia- pH of 12
lemon juice, water, ammonia
say you are conducting an experiment where you have to use a spring scale to weigh objects. you notice some of the objects are hard to weigh, what should you do???
conduct repeated trials in order to achieve the most accurate result. (more data, More accuracy)
How many elements are in the compound: H2SO4 (sulfuric acid)
3: hydrogen, Sodium, Oxygen
what is the difference between a group and a period on the periodic table
a group is numbered from left to right and symbolizes the columns on the periodic table. elements in the same group have the same number of valence electrons
a period is numbered from top to bottom
Lemon juice- pH of 2
Water- pH of 7
Ammonia- pH of 12
least acidic-> ammonia, water, lemon juice <- most acidic
what makes the results of a scientific experiment more accurate?
test each variable multiple times! Repetition is key to accuracy!
the human body is made mostly of three elements: carbon, hydrogen, and oxygen. but how do we get things like proteins, blood, and fats???
a small number of elements are arranged into a large number of configurations.
think like a recipe, bread and pancakes are made very similarly, but with different ratios of each ingredient. EX: C6H12O6 (glucose) vs C12H22O11 (sucrose)