Which of the following is the greatest speed: 20 m/s, 200 cm/s, or 0.2 km / s

The mercury content of a stream was believed to be above the minimum considered safe-1 part per billion (ppb) by weight. an analysis indicated that the concentration was 0.68 parts per billion. what quantity of mercury in grams was present in 15.

a chemical bond is considered polar when the value of the electronegativity difference falls between__and__; nonpolar when the value is less than__.

Is there ANY acid that can destroy resin, if so, what is it?

How many moles of He are in 16 g of the element? 1.0 mol 4.0 mol 8.0 mol 16 mol

zno-zn (oh) 2-znso4-zn (oh) 2-zno-zn (no3) 2

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets