Are people made up of matter? Do they have mass?

Who is regarded as father of modern chemistry?

Which of the following is a pure substance that can be separated by physical means and can't be decomposed into other substances by chemical means A: element B:molecule C: compound D: mixture

What is quantum model of the atom often called.

What is the chemical symbol for iron

All measurements have some degree of uncertainty. True False

What is the chemical formula of a compound that is composed of the ions Ca2 + and br-

What element is likely to form an ionic compound with chlorine?

Will a parachute slow a skydiver more at a very high altitude or a lower altitude?

Carbon monoxide is: Only found in large cities An odorless, colorless, toxic gas Healthy to breath in A danger when driving on the open highway

What is a potential benefit of fuel cell cars? increased efficiency converting gasoline to energy no recharging necessary decreased automobile cost larger engines