BARU
Ukuran huruf
Lembar kerjaQuarter 1 benchmark review
Total soal: 14
Worksheet time: 7mins
A science class compared two stones to determine if they were composed of the same or different substances.
Which student's statement about the two stones is true?
Anna said, "The two stones are the same, because they are both colorless."
Brian said, "The two stones are not the same, because they different densities and their hardness is different."
Cory said, "There is not enough information to tell if they are the same or different."
Dai said, "They are the same stone, because they have the same solubility in water."
In this chemical change, methane and oxygen combine to yield carbon dioxide and water. What are the products of this reaction?
CO2 and H2O
CH4 and 2 O2
carbon and oxygen
carbon, hydrogen, and oxygen
Which of the following could indicate that a chemical change took place?
Change in color
Production of Energy
Formation of Gas
All are signs of a chemical change
What happens in ever chemical change?
Bubbles form and fizz
Heat is given off or taken in.
A new substance with new properties forms
The density of the new substance always stays the same.
A scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda ( NaHCO3) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?
The baking soda and hydrochloric acid combined, and bubbles formed.
The baking soda absorbed the hydrochloric acid.
Some of the baking soda dissolved in the hydrochloric acid.
The hydrochloric acid evaporated, leaving only the baking soda
Which scientific observation, shown in the chart, indicates that a chemical reaction has NOT occurred?
Number 1
Number 2
Number 3
Number 4
What evidence can you use to infer that a chemical reaction has occurred here?
A dark solid formed on the zinc metal
The zinc metal remained silver-colored and shiny
The CuSO4 solution turned blue when the zinc metal was added
None of these
Which of the following substances is a product of photosynthesis?
carbon dioxide
water
ATP
Glucose
Which form of energy do plants require to make "food" using photosynthesis?
radiant energy
thermal energy
chemical energy
nuclear energy
Where is energy stored in food?
Energy is In the soft parts between the hard parts.
Energy is in the atoms that make up the molecules of food
Energy holds the atoms of the molecules together.
Energy is in the vitamins and minerals.
What are the reactants in all combustion (burning) chemical reactions?
smoke and gas
light and heat
wood and fire
fuel and oxygen
What material does the Elodea require to make food?
oxygen
radiant energy
glucose
carbon dioxide
BTB turns yellow in the presence of CO2 and is blue when CO2 is not present.
If Elodea has been in a closed test tube for days under a grow lamp, what color would the BTB be?
yellow; because the CO2 would be very high.
pale green; because there would be high CO2 and low O2
more blue than yellow; because the plant would use the CO2 and make O2.
clear; the plant would change the BTB into food
Is this the chemical equation for photosynthesis or cellular reproduction?
6 CO2 + 6 H2O --> C6H12O6 + 6 H20
photosynthesis
cellular reproduction
