Chemical + Physical
Flammability is an example of:
A. Physical Property
B. Chemical Property
C. Physical Change
D. Chemical Change
B. Chemical Property
Which characteristics of water quality provides the most info. about the water's health?
A. presence of indicator species
B. temperature
C. concentration of heavy metals
A. presence of indicator species
Which best compares bacteria and virus?
A. Bacteria are smaller than viruses.Bacteria are smaller than viruses.
B. Bacteria cause disease, but viruses do not.
C. Bacteria are living organisms, but viruses are not.
B. Bacteria cause disease, but viruses do not.
Which best describes how corn was modified to produce an odor that repels insects?
A. crop rotation techniques
B. chemical exposure
C. techniques used in biotechnology
C. techniques used in biotechnology
Which chemical equation best represents the law of conservation of mass?
A. H + O --> H2O
B. H2 + O2 --> H2O
C. 2H2 + O2 -->2H2O
C. 2H2 + O2 -->2H2O
Which is the best example of chemical change?
A. butter melting
B. water evaporating
C. egg cooking
D. Sugar dissolving in water
C. egg cooking
What the name of the agency that monitors our water quality?
EPA
Environmental Protection Agency
What is the most likely result of overusing a particular antibiotics?
A. fewer infections
B. more infections caused by bacteria resistant to the antibiotic
C. fewer infections caused by bacteria resistant to the antibiotic
B. more infections caused by bacteria resistant to the antibiotic
Which is an example of geologic evolution?
A. natural selection
B. biodiversity
C. continental drift
D. development of tools
C. continental drift
How is the Law of Conservation of Matter best represented in a chemical reaction?
A The mass of the reactants is greater than the mass of the products.
B The mass of the reactants is equivalent to the mass of the products.
B The mass of the reactants is equivalent to the mass of the products.
An apple turns brown when it is exposed to oxygen for a while. This process is known as oxidation. We classify this process as a:
A. Physical Change
B. Chemical Change
C. Physical Property
D. Chemical Property
B. Chemical Change
Answer both statements using MORE or LESS
Warm water = _______ dissolved oxygen
Cold water = _______ dissolved oxygen
Warm water = LESS dissolved oxygen
Cold water = MORE dissolved oxygen
Although antibiotics are useful in the control of bacteria, which best describes the disadvantage from their overuse?
A. The overuse of antibiotics could lead to pollution of water resources.
B. The overuse of antibiotics could lead to resistant strains of bacteria.
C. The overuse of antibiotics could lead to the spread of mutated diseases.
D. The overuse of antibiotics could lead to weakened immune systems in humans.
B. The overuse of antibiotics could lead to resistant strains of bacteria.
Which statement is true?
A. All animals can adapt easily to any change in their environment.
B. Individual organisms with certain favorable traits are more likely than others to survive and have offspring.
C. Even identical twins and clones do not have the same DNA sequence.
B. Individual organisms with certain favorable traits are more likely than others to survive and have offspring.
Does this follow the law of conservation of mass?
Explain your answer.
3Fe + H2 O ---> Fe3O4 + H2
NO, the # of atoms is not the same on both the sides. There is 1 O atoms on the reactant side and 4 O atoms on the product side
Density is considered a:
A. Physical Property
Why does eutrophication (algae blooms) occur?
Too many nitrates + phosphates in water from farm lands
Which microbes are classified by their three shapes: round, rod and spiral?
Bacteria
How has biotechnology helped to improve the agricultural industry?
A by developing irrigation systems that cover a large land area
B by creating some crops that resist certain insects
C by producing soil free of decomposers
B by creating some crops that resist certain insects
H2CO3 → H2O + CO2
How does the reaction support the Law of Conservation of Mass?
The number of the atoms in the reactant equals the number of the atoms in the products.
What is an example of a chemical property?
Answers may vary:
Flammability, Toxicity, Reactivity, Oxidation
How do bioindicators help tell us about the health of the water? Explain in full details.
Bioindicators are sensitive to pollution!
Less bioindicators=water is NOT healthy
More bioindicators=water IS healthy!
i. Which pathogen requires a host cell to invade and replicate?
ii. And which other pathogen is it similar to?
i. Virus
ii. Parasite
What most likely would happen if fertilizers from a nearby farm pollute this pond?
Algae blooms would occur which would eventually lower the dissolved oxygen in the pond.
Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. What happened?
Some of the atoms during the reaction escaped into the air.