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What can you find on the periodic table? the chemical formula for salt all the compounds that exist in the universe all the elements that have been discovered the number of hydrogen atoms there are in a molecule of water The drawing shown here is an example of a pure substance a mixture a compound none of the above 4 7 5 2 How many atoms make up the compound shown here? Which of the following represents a compound? salt nitrogen oxygen carbon When an atom of oxygen bonds with two atoms of hydrogen, which compound is made O2H CO2 H2O C6H12O6 a. They break down when reacting with acids b. they can be altered with electric current c. they are always metals d. they are considered a pure substance Which of the following is a characteristic of elements? 3 elements two compounds two elements two atoms This molecule of calcium chloride contains if it has more than one capital letter it is an element How do you know if something is a compound or an element? if it only has one capital letter is it a compound If it has more than one capital letter in its chemical formula it is a compound if it is pure it is a compound This is the only planet supporting life and has the most varied surface. It is the densest body in the Solar System. It is often called the "Blue Planet." MERCURY SATURN MARS EARTH These planets are gas planets and found farthest from the Sun SATURN, URANUS, JUPITER, NEPTUNE MERCURY, MARS, JUPITER EARTH, MARS, JUPITER, SATURN SATURN, MARS, JUPITER, URANUS element 4 elements compound pure substance The formula for oxygen is O2 This tells us there are ________ elements present. 2 4 1 6 If calcium Chloride is writtenCaCl2 then there are two compounds it has 3 elements it is a pure substance there are two elements There are _______planets 7 8 9 10 Which of these is an example of a compound? A, B and C A A, and B B B and C none of the above C |