A scientist to study in a sample of an unknown substance do scientist determine's with the substance is a metalloid with four valence electrons. Which two elements could the unknown be

A soild reactant is placed in to a beaker of warm water. The liquid vigorously bubbles as the solid dissolves into the solution. What will most likely happen if the temperature of the liquid is slighty reduce?

What is the percent mass/volume (%m/v) of a solution that is made from putting 25.0 g of nacl in water to make 275 ml of solution?

What happens when you add nacl to dilute sulfuric acid?

What is the solubility product expression for Ag2CO3

Bju chemistry section 5b a. the energy change that occurs when an atomic anion is formed

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?

Which is an example of flow of heat through conduction

Which of the following is an extensive physical property of matter? volume viscosity odor density