True or False

When comparing an empirical formula to a molecular formula the subscripts after each element in both formulas are the same

You may eat food, drink beverages, or chew gum in the laboratory. However, do not use laboratory glassware as containers for food or beverages. T/F

How many known elements dose the periodic table show? a) 4 b) 92 c) 118

Exit How many grams are in a mole of hydrogen chloride (HCl) ? 1 H 1.01 Hydrogen 17 Cl 35.45 Chlorine

an object is found to have a mass of 77 g find the objects density if its volume is 46.55cm³ answer in units of g/cm3

What happens to the blood that reaches the lungs from the pulmonary artery? picks up CO2 and releases O2 picks up CO2 and O2 picks up O2 and releases CO2 releases O2 and CO2

Make a list of physical changes and chemical changes that you observe or see effects of in the school

Which equation obeys the law of conservation of mass? H2 (g) + O2 (g) → H2O (g) H2 (g) + O2 (g) → H2O (g) + 4He (g) 2H2 (g) + O2 (g) → 2H2O (g) H2 (g) → H2O (g) H2 (g) + O2 (g) → 2H2O (g)

Which statement is true about sodium chloride (NaCl) ? It is a salt because it decreases the concentration of metallic ions. It is an acid because it is formed by the reaction of a salt and an acid.

After pyruvate oxidation, the chemical energy of how many carbons of the original glucose molecule is converted to chemical energy in the form of atp in the remaining steps of cellular respiration?

What do you call all elements that are clearly not metals? ? nonmetals ? metalloids