WorksheetsReview Game 1
Total questions: 13
Worksheet time: 15mins
When two or more elements combine chemically, they form _________.
DNA
atoms
molecules
compounds
Which of the following substances cannot be decomposed into a simpler substance?
water
H2 Ohydrogen H
salt NaCl
ammonia NH3
One way to tell how many elements a compound has is to..
multiply the number
count the capital letters
add up all the numbers
count the letters
Which describes a property of all elements?
All elements are pure substances.
All elements exist in the solid phase.
All elements are metals.
A student sees the diagram shown in a textbook.
What does the symbol in the diagram represent?
a compound
an element
a molecule
When oxygen combines with hydrogen, which substance is formed?
A. water
B. vinegar
C. hydrochloric acid
When two or more elements combine chemically, they form _________.
DNA
atoms
molecules
compounds
