What are the atomic number and chemical symbol for helium

What is the mass of one mole of NA

A sunflower turns its head toward sunlight. What triggers this behavior in a sunflower? gravity phototropism presence of nutrients presence of water

Which part of experimental design is most important to a scientist when replicating an experiment? (a) having exactly the same data as the previous experiment (b) using the same procedure and variables as the previous experiment (c) conducting and

How many liters are in 2.5 moles of Chlorine gas?

How many moles of S are in 33.3 g of (C3H5) 2S

Does beryllium or sodium have the same inside electron arrangement as magnesium

How do carbohydrates relate to organic chemistry

Periodic table, chemistry questions who discovered lanthanides. how did they discover it, when did they discover it.

A flask containing 155cm^3 of hydrogen was collected under a pressure of 22.5kPa. What pressure would have been required in order for the volume of the gas to have been 90.0 cm^3 at constant temperature?

Which change is most likely to occur when a molecule of H2 and a molecule of I2 collide with proper orientation and sufficient energy? 1. a chemical change, because a compound is formed 2. a chemical change, because an element is formed 3.