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A student heated a 10 g sample of a compound in an open container. A chemical
reaction occurred. The mass of the sample was measured again and found to be less
than before. Which of the following explains the change in mass of the sample?
6.1 Which of the following exsplains the change in mass of the sample
A. The heat caused the compound to become less dense
B. One of the reactions products was gas
C. The reaction gave off more heat than was added
D. Some of the lighter atoms where converted to energy

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b. slope c. benchmark d. index contour

What is the value of keq for the reaction expressed in scientific notation

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next