Scientific Method & Chemistry Assignment Flashcards
According to the scientific method, what is a possible answer to a question?
hypothesis
What is the correct order for the scientific method?
observation, question, hypothesis, experiment, results, conclusion
a scientific theory at one point in time was a hypothesis.
T/F
True
What is correct for a control group?
a. it receives the smallest amount of the drug
b. it does not receive the drug
c. it is the group that is manipulated
d. all of the above
b. it does not receive the drug
[a] in data between the control and experimental group along with [b] are the two factors that stastical significance depends on.
a. Magnitude of the difference
b. sample size
What is the most trustworth source of scientific information?
primary source
Put in chronological order the headings that are found in a primary source article.
- abstract
- background
- methods
- results
- discussion
- conclusion
What is good science?
a. has a hypothesis
b. only one variable is manipulated
c. large sample sizes
d. is tested more than once
e. has alternate hypotheses
f. uses primary source articles to guide research
g. all of the above
g. all of the above
What makes a good clinical trial?
a. has placebo
b. is randomized
c. large sample size
d. published in a reputable journal
e. all of the above
e. all of the above
what is a pure substance called?
a. cell
b. molecule
c. atom
d. element
d. element
What are the 4 elements that make up the bulk of living organisms?
carbon, hydrogen, oxygen, and nitrogen
What element is needed to make thyroid hormone and what food has that element added to it?
iodine; salt
What is correct about neutrons of an atom?
a. have a positive charge
b. have a negative charge
c. are located orbiting the nucleus
d. have an atomic mass of 1
d. have an atomic mass of 1
What determines atomic number?
a. number of neutrons
b. number of protons
c. number of electrons
d. number of protons and neutrons
b. number of protons
A nitrogen atom has an atomic number of 7, so its atomic mass is ____?
a. 3
b. 7
c. 14
d. 21
c. 14
How many electrons can the first shell of an atom hold?
2
Variant forms of an element are ___________where the number of __________vary.
a. ions; neutrons
b. ions; electrons
c. isotopes; neutrons
d. isotopes; electrons
c. isotopes; neutrons
A charged atom is an isotope?
T/F
False
When an atom donates an electron and another accepts it, a(n) _________bond is formed?
a. ionic
b. nonpolar covalent
c. polar covalent
d. hydrogen
a. ionic
An equal sharing of electrons between two atoms is a(n) ___ bond.
a. ionic
b. non polar covalent
c. polar covalent
d. hydrogen
b. non polar covalent
What is the percentage of the human body the is made up of water?
60%
Water is a ___ because it dissolves other substances.
solvent
Concentration of what ion determines the pH of a solution?
a. carbon ion
b. chloride ion
c. hydrogen ion
d. potassium ion
c. hydrogen ion
A solution with a ph of 4 has a _________concentration of hydrogen ions and is a(n)__________solution.
a. high; basic
b. low; basic
c. high; acidic
d. low; acidic
c. high; acidic
A biological molecule is organic, meaning it contains what element?
a. hydrogen
b. nitrogen
c. oxygen
d. carbon
d. carbon
What is NOT a major type of macromolecule?
a. protein
b. nucleic acid
c. sugar
d. carbohydrate
c. sugar
Match the monomer with its macromolecule. -Sugar -amino acid -nucleotide -fatty acid chain A. Protein B. Lipid C. Carbohydrate D. DNA
sugar–C: carbohydrate
amino acid–A: protein
nucleotide–D: DNA
fatty acid chain–B: Lipid
Match the combination of simple sugars with the appropriate disaccharide.
Glucose & Glucose
Glucose & Glucose: Maltose (grain sugar)
Match the polysaccharide with its function:
glycogen
energy storage in animals
Match the polysaccharide with its function:
starch
energy storage in plants
Match the polysaccharide with its function:
cellulose
gives rigidity to plants
Match the polysaccharide with its function:
chitin
gives rigidity to insect bodies
Match the combination of simple sugars with the appropriate disaccharide.
Glucose & Galactose
Glucose & Galactose: Lactose (milk sugar)
Match the combination of simple sugars with the appropriate disaccharide.
Glucose & Fructose
Glucose & Fructose: Sucrose (table sugar)
What is a function of proteins?
a. can carry substances around the body
b. can protect from diseases
c. speed up reactions
d. act as membrane receptors
e. all are functions of proteins
e. all are functions of proteins
What are 2 type of nucleic acids?
DNA; RNA
Match the lipid with the appropriate example or description of that lipid: -phospholipids -triglycerides -waxes -steroids A. cholesterol B. semisolid lipids C. cell membrane fats D. storage fats
phospholipids: C. Cell membrane fats
triglycerides: D. Storage fats
waxes: B. Semisolid lipids
steroids: A. Cholesterol
What type of lipid is usually unhealthy and is a solid at room temperature?
saturated fats
High Density Lipoproteins (HDLs) are bad cholesterol.
T/F
False
How is a hypothesis tested?
a. doing research and investigating peer review articles
b. conducting an experiment or gathering observational data
c. developing a theory of how the world works
d. looking at statistical facts and providing evidence
e. none of the above
b. conducting an experiment or gathering observational data
What part of a primary source article contains information on how an experiment was designed?
a. background
b. results
c. methods
d. conclusion
e. discussion
c. methods
What are two factors from your powerpoint slides that statistical significance depends on?
magnitude of the difference and sample size
Molybdenum has an atomic number of 42. Which of the following is true of a neutral molybdenum atom?
a. It has 42 protons, 21 neutrons and 42 electrons
b. It has 42 protons, 42 electrons and no neutrons
c. It has 42 protons, 42 neutrons and 42 electrons
d. It has 21 protons, 21 neutrons and 21 electrons
e. It has 21 protons, 21 electrons and no neutrons
c. It has 42 protons, 42 neutrons, and 42 electrons
What element below is not one of the four elements that make up the bulk of living organisms?
a. nickel
b. carbon
c. oxygen
d. nitrogen
e. hydrogen
a. nickel
_____is a charged atom.
a. a molecule
b. an ion
c. an isotope
d. water
e. none of the above
b. an ion
What is INCORRECT about water?
a. 60% of the human body is water
b. it is a solvent
c. ice floats in liquid water
d. hydrogen bonds between water molecules creates surface tension
e. it is an organic molecule
e. it is an organic molecule
What is the monomer for proteins?
a. monosaccharides
b. enzymes
c. nucleic acids
d. amino acids
e. triglycerides
d. amino acids
What two monosaccharides are bonded together to make lactose?
a. glucose and fructose
b. glucose and glucose
c. fructose and fructose
d. glucose and galactose
e. galactose and galactose
d. glucose and galactose
Cholesterol is what ‘type’ of lipid?
a. steroid
b. saturated fat
c. unsaturated fat
d. wax
e. triglyceride
a. steroid
