Which best describes an element? a. a pure substance b. a type of mixture c. a pure compound d. an impure substance

What is the number of magnesium atoms that equal a mass of 24.31 amu?

One similarity between all mixtures and compounds is that both

A student collected nitrogen by displacing water in a graduated cylinder. the atmospheric pressure was 738.9 mmhg; the height of the water remaining in the cylinder was 13.2 mm; the partial pressure of the water was 18.8 mmhg.

Part a how many carbon atoms are in a 2-carat pure diamond that has a mass of 0.40 g. express your answer using two significant figures.

Which of the following is made of matter? A. Energy B. Heat C. Light D. The sun

What common household element can, over time, reduce airflow, insulate components, reduce heat exchange or even cause the system to hang or reboot?

Clouds that form at an elevation of 3 kilometers will most likely be composed of A) raindrops B) ozone C) ice crystals D) sleet

Describe how glacial erosion influenced the topography of Ohio.

Which of the answer choices lists a compound? h2, h2o, NaCl, or O2

What is earths water called