What is the place or role of a species within an ecosystem?
niche
100
What is a covalent bond?
a bond formed by two or more nonmetal atoms sharing one or more pairs of electrons
100
What is the zone where there is not enough sunlight for photosynthesis to occur?
profundal
100
What is the reaction expected when a glowing splint is placed in a test tube of oxygen gas?
the splint will burst into flame
100
What is a solution with a pH of 8 described as?
slightly acidic
200
What happens when DDT has been used for a period of time?
it begins to accumulate in the bodies of top carnivores
200
What are the clues that a chemical change has occurred?
a new color appears, heat or light is given off, bubbles of gas are formed, a solid material(precipitate), the change is difficult to reverse
200
What is the zone where there is enough for photosynthesis to occur beyond the lakeshore?
limnetic
200
In a chemical reaction, a metallic element usually does what?
loses electrons
200
Which chemical reaction type does the following belong to?
2K + H₂SO₄ -> K₂SO₄ + H₂
single displacement
300
What is the energy from the sun that allows green plants to carry on photosynthesis and arrives in the form of...?
visible light
300
What is double displacement?
a chemical reaction that occurs when elements in different compounds displace each other or exchange places to form two new compounds
300
What is happening to atoms of carbon right now?
they are continuously recycled
300
What is expected when cobalt chloride paper is inserted in a cold plate of water?
the cobalt chloride paper turns pink
300
What is the zone where plants rooted in the bottom of the lake can no longer be found?
littoral
400
What happened to the candle when Joseph Priestly sealed it inside a jar?
Went out because it consumed all the oxygen
400
What is the neutral number on a pH scale?
7
400
What is the process of photosynthesis
consumes energy from sunlight
400
What is expected when a burning splint is placed in a test tube of hydrogen gas?
the flame goes out and makes a popping sound
400
What is a downside to artificial ecosystems?
they show less biodiversity than natural ecosystems
500
What is the water table?
Wthe boundary, found either in the soil or in bedrock, between the area where ground water is percolating down and a layer that is saturated with water
500
What is valence?
the combining capacity of an element
500
What is the difference between oligotrophic lakes and eutrophic lakes?
oligotrophic lakes are usually cold and deep have low nutrient levels and clear water, eutrophic lakes are usually shallow and warm with high nutrient levels and murky water
500
What is the first element listed in an ionic compound?
metal
500
What is a polyatomic ion?
Groups of atoms that tend to stay and carry an overall ionic charge