Which of the following elements is the smallest?

A. Strontium (Sr)

B. Calcium (Ca)

C. Beryllium (Be)

D. Magnesium (Mg)

Which statement about human activity and the environment is NOT true?

A container of oxygen with a volume of 150 L is heated from 300 K to 600 K. What is the new volume? * O 75 O 150 O 300 O 600

Which of the following numerical expressions gives the number of moles in 5.0g of CaO? 5.0g*56g/mol A 5.0g56g/mol B 56g/mol5.0g C 15.0g*156g/mol

Why should we practice the local methods of separation?

What is the percent composition by mass of oxygen in Ca (NO3) 2 (gram-formula mass=164 g/mol) ? (1) 9.8% (3) 48% (2) 29% (4) 59%

Calculate the percent by mass sulfur in sulfuric acid, h2so4.

4. What electrons are involved in chemical bonding?

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

What is the formula for lithium iodide

Which statement would be the most useful for deriving the ideal gas law? Volume is directly proportional to the number of moles. Volume is inversely proportional to the temperature. Pressure is directly proportional to the volume.