13. Consider the following hypothesis: A snake will be more active when the heat lamp is switched on than it is when the heat lamp is turned off.
What is the outcome variable (dependent variable) in an experiment designed to test this
hypothesis?
م ن ق 4
whether the heat lamp is on or off
the number of snakes in the habitat
the number of times the snake moves
the size of the habitat

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?