A certain element is a gas and does not conduct electricity or heat. Which of the following is a possible number of valence electrons for the atoms of this element?

Compared to the particles in a hardened lava sample, the particles in a liquid lava sample A. Have less kinetic energy B. Are closed together C. Are moving faster

What are some words that describe physical change

How many moles of atoms are contained in 15.7 g of Bromine

Explain why are we able to use water displacement to find the volume of the irregular objects in cm3.

The average speeds of gas molecules in. cylinders A, b, c, d are 0.01 m/s, 0.005m/s, 0.1 m/s and 0.5 m/s, respectively. which cylinder contains gas that is closest to. absolute. zero

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting

Science is a unique field of thought because it relies on to describe the world. •Observations and experim •Teachers and students •Books and writings •Scientists and statements

Hemoglobin, a protein in red blood cells, carries o2 from the lungs to the body's cells. iron (as ferrous ion, fe2+) makes up 0.33 mass % of hemoglobin. if the molar mass of hemoglobin is 6.8 Ã 104 g/mol, how many fe2 + ions are in one molecule?

What could you predict about a methane molecule that would most likely be made by using both the quantum model of the atom and John Dalton's model?

What is the molar mass of an unknown hydrocarbon whose density is measured to be 1.97 g/l at stp?