Which of the following measurements is expressed to three significant figures? 7.30 * 10-7 km 0.007 m 7077 mg 0.070 mm

The molar mass of copper is 63.55 g/mol. How many moles of copper were reacted?

21 g each of Li (molar mass = 7 g/mol) and N2 (molar mass = 28 g/mol) are placed in a reaction vessel. What is the maximum mass of Li3N (molar mass = 35) that can be produced?

Which formula represents an acid? A. CH4 B. HCl C. NH3 D. PH3

Maria examines a mixture that appears to be the same throughout. However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid. Which conclusion best fits her observations?

When two plates with continental crust converge, why are neither of them subducted

The volume, in liters, of 538 g of CO2

9.86 x 10²⁸ O-atoms require what volume (L) N₂O₂ at STP?

What is a group of elements that form salts called

Which number represents an acidic pH, 4 or 9?

What would make the risk of these cancers even worse for someone who drinks alcohol?