When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change?

50 grams of water is placed into a beaker the mass of the beaker is now 115 grams what is the mass of the empty beaker

Explain in terms of chemical interaction how milk of magnesia acts to calm an upset stomach.

Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodic table?

Among these properties of acids, bases, or both, which property is specific to acids only? A. Accepts protons B. Bitter taste C. Electrically conductive D. Slippery feel E. Sour taste

Picking up sediment and moving it to another area is called a. abrasion c. deflation b. deposits d. sand blasting

An atom of oxygen (atomic number 8) with an atomic mass of 16 would have how many neutrons?

Chlorophyll reflects which of these colors? a. red b. blue c. green d. yellow

Extracting oil from shale deposits a has been initiated on a large scale in the United States and will soon surpass Canada's production. b involves removing and refining waxy hydrocarbons called kerogen.

Which shows the levels of organization within an ecosystem from largest to smallest?

the physical properties of 10 grams of iron are the same as the ___ properties of 20 grams of iron a) reactive b) physical c) chemical