How many moles are in 67.42 grams Si?

If the smallest markings on a ruler are one tenth (1/10) of a centimeter, which of the following measurements could be recorded using that ruler? A. 2.5 cm B. 2.52 cm C. 2.520 cm D. 2.5200 cm

One ball rolls along a shelf at a steady rate. a second ball rolls off the shelf and gains speed as it falls in a curved path. which must have an unbalanced force acting on it?

How many protons, electrons, and neutrons does 40Ar have?

In any food web, animals function as a A) carnivores. Eliminate B) consumers. C) decomposers. D) producers.

According to the lewis dot structure above water has how many electron groups

5.2*10^26 molecules of ch4 in volume

Which of the following statements about igneous rocks is correct A. intrusive igneous rocks are formed when magma is called above the ground. B. Extrusive igneous rocks are formed when magma is cooled above the ground C.

The compound KOH is called

A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm?

If 100 mL of a gas were enclosed in a buret at 500 mm Hg, what volume would the gas occupy at 1000 mm Hg at the same temperature? P1V1=P2V2