Question: Question 19 2 points Previous Compounds are substances that contain two or more elements combined in definite proportion by O A. Mass O B. Volume

Question 19 2 points Previous Compounds are substances that contain two

or more elements combined in definite proportion by O A. Mass O

B. Volume O c. Mixture O D. Compound Question 20 3 points

Question 19 2 points Previous Compounds are substances that contain two or more elements combined in definite proportion by O A. Mass O B. Volume O c. Mixture O D. Compound Question 20 3 points Previou Give the coefficients (arranged from left to right)of each of the chemical substances to balance the ff. equation C2H6 + O2 ==> H2O + CO2 OA. 6, 4, 2,7 OB. 7,4 2,6 Oc. 2, 7, 6, 4 OD. 2,4,6,7 Question 21 2 points Previous These elements are gases at room temperature, have low boiling points, and low melting points O A. halogens O B. inert gases O c. alkalis OD. alkaoids

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