DCA #3 Review Question Preview (ID: 49368)
Science Review.
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What evidence shows that a chemical reaction occurred in baking a cake?
a) The water evaporates in the batter
b) The cake rises and as gas bubbles form
c) The cake takes the shape of the pan
d) The water keeps the cake moist
The following is a sample of a formula - CH2C4H8COCH3 - how many atoms of each element are in one molecule?
a) 4 carbon, 11 hydrogen, and 1 oxygen
b) 7 carbon, 14 hydrogen, and 1 oxygen
c) 7 carbon, 11 hydrogen, and 8 oxygen
d) 6 carbon, 14 hydrogen, and 3 oxygen
If you trying to classify and unidentified material as either a metal or nonmetal - what question would help you?
a) Is it malleable and ductile?
b) Does it taste weird?
c) Will it float in water?
d) Does it feel rough or smooth?
A class performs a test on a sample of an element, it is a solid, shiny, and conducts electricity and heat - which group would this sample NOT be in?
a) Group 1
b) Group 3
c) Group 5
d) Group 18
Which 2 elements together add up to 23 protons?
a) Sodium and Magnesium
b) Boron and Carbon
c) Copper and Zinc
d) None of these
In an atom - which particles represent the reactivity of the atom?
a) Protons
b) Neutrons
c) Valence electrons
d) None of these
If Krypton has atomic number 36, and mass # of 84-how many subatomic particles inside and outside of the nucleus?
a) 36 inside nucleus and 36 outside nucleus
b) 84 inside nucleus and 84 outside nucleus
c) 84 inside nucleus and 36 outside nucleus
d) 84 inside nucleus and 50 outside nucleus
Which one describes a physical change during digestion?
a) Acid in the stomach breaking down
b) Chewing and breaking down food into small pieces
c) The saliva in the mouth that breaks down starches
d) Bacteria in the intestine that turns into fat
If a rock is sitting on a sidewalk - which statement explains why the rock is motionless?
a) The forces on the rock are all balanced
b) The only force is the sidewalk pushing it up
c) There is no force
d) The sidewalk is pushing an unbalanced force on the rock
If a pitcher throws a ball to the batter and the bat applies 10 newton force to the ball - which one correctly describes the reaction force between the ball and the bat?
a) Reaction force is the force that cause the ball to move toward the bat
b) Reaction force is the force applied to he bat by the batter
c) Reaction force is the force that pulls the ball toward the ground
d) The reaction force is the force of the ball on the bat
Which energy transformation occurs when the blades on a wind turbine are moving?
a) Electrical to mechanical
b) Chemical to electrical
c) Mechanical to electrical
d) Chemical to mechanical
If the Sun is our main source of energy - which model best describes the flow of energy in an ecosystem?
a) Sun - Mosquitoes - Shrimp - Coyotes
b) Sun - Algae - Shrimp - Red Drum Fish
c) Sun - Sunfish - Shrimp - Wood ducks
d) Sun - Willow oaks - Algae - River otters
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