A chemist examines two compounds. Both are clear, odorless liquids. Which of the following would not
indicate that a chemical change has occurred when the two compounds are combined?

The product remains odorless but turns blue.
The product is also clear and odorless.
The product remains clear but a new smell is apparent.
The product remains clear but bubbles form.

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

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