Unit 1-Nature of Life and Introduction to Chemistry Flashcards
(chamoy.)
What is the independent and dependent variable?
IV-experimental choices
DV-outcome
What is a hypothesis?
An educated guess on the outcome of an experiment based on your knowledge.
What is a control and experimental group?
Control-comparison group (either positive or negative)
Experimental Group-treatment group
What are constants?
Things you keep the same while doing experiments.
What is qualitative and quantitative data?
Qualitative- their physical traits
Quantitative- measurable aspect
What is positive and negative groups?
negative-group that isn’t exposed to the treatment or to any other treatment
positive-group that isn’t exposed to the treatment but is exposed to some other treatment
What is a Null hypothesis?
There is no relationship between the data and the hypothesis.
How many characteristics of life must there be for something to be living?
8
Where do you find protons and neutrons?
In the nucleus
Where do you find electrons?
in the cloud
What is the difference between an element and a compound?
An element is made up of one pure substance and a compound is a mixture of elements.
What are isotopes?
An atom that varys in neutrons but has the same number of electrons
What is the difference between a polar and nonpolar bond?
Polar-not shared equally of electrons
Nonpolar-shared equally
What are the three bonds?
Ionic
Covalent
Hydrogen
What do ionic bonds do?
they gain or lose electrons when bonding
What do covalent bonds do?
they share electrons
What do hydrogen bonds do?
water bonds between polar molecules
What is the range scale for substances with more H+?
0-6.9
What is the range scale for neutral substances?
7
What is the range scale for substances with more OH-
7.1-14
What is cohesion?
When water is attracted to other water, forming a polar hydrogen bond.
What is adhesion?
When water is attracted to other substances.
What is electronegativity?
The pull of atoms in a bond.
How do you know which atoms have a greater electronegativity?
It increases when you go right on the periodic table.
