Which change is chemical?(1 point)
Responses
water freezing: liquid water becoming solid water
water freezing: liquid water becoming solid water
water boiling: solid water becoming gaseous water
water boiling: solid water becoming gaseous water
water evaporating: liquid water becoming gaseous water
water evaporating: liquid water becoming gaseous water
water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules
9 answers
water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules
Which number remains unchanged during photosynthesis?(1 point)
Responses
the number of glucose molecules
the number of glucose molecules
the number of carbon atoms
the number of carbon atoms
the number of carbon dioxide molecules
the number of carbon dioxide molecules
the number of water molecules
Responses
the number of glucose molecules
the number of glucose molecules
the number of carbon atoms
the number of carbon atoms
the number of carbon dioxide molecules
the number of carbon dioxide molecules
the number of water molecules
the number of carbon atoms
In a chemical reaction, which aspect of the reactants changes?(1 point)
Responses
name of each element
name of each element
total mass
total mass
nuclei
nuclei
arrangement of the atoms
Responses
name of each element
name of each element
total mass
total mass
nuclei
nuclei
arrangement of the atoms
arrangement of the atoms
A young snake eats and digests a mouse. The increase in the snake’s mass equals(1 point)
Responses
the mass of the mouse plus the mass of waste produced by the snake.
the mass of the mouse plus the mass of waste produced by the snake.
only the mass of the mouse
only the mass of the mouse
the mass of the mouse minus the mass of waste produced by the snake.
the mass of the mouse minus the mass of waste produced by the snake.
the mass of the mouse plus the original mass of the snake.
Responses
the mass of the mouse plus the mass of waste produced by the snake.
the mass of the mouse plus the mass of waste produced by the snake.
only the mass of the mouse
only the mass of the mouse
the mass of the mouse minus the mass of waste produced by the snake.
the mass of the mouse minus the mass of waste produced by the snake.
the mass of the mouse plus the original mass of the snake.
the mass of the mouse plus the mass of waste produced by the snake.
Cellular respiration transforms glucose and oxygen into carbon dioxide, water, and energy.
C6H12O6 + 6O2 → 6CO2 + ?H2O + Energy
Based on the law of conservation of matter, what is the missing coefficient for water?
(1 point)
Responses
6
6
8
8
2
2
4
C6H12O6 + 6O2 → 6CO2 + ?H2O + Energy
Based on the law of conservation of matter, what is the missing coefficient for water?
(1 point)
Responses
6
6
8
8
2
2
4
6
9 answers