Which two elements most likely have the most similar properties?

beryllium and boron

scandium and silicon

nitrogen and phosphorus

hydrogen and helium

Match the following items with their definitions. 1. a substance maintaining a uniform appearance throughout miscible 2. a mixture consisting of visibly different substances or phases heterogeneous 3.

Which method would you use to perform these reactions, grignard carboxylation or nitrile hydrolysis? reaction #1:?

Earthquakes are not easy to predict, but volcanic eruptions have more warning signals and instruments to measure those signals, therefore making them somewhat easier to forecast. The difficulty with predicting volcanic eruptions is the___. A.

Carefully examine the following chemical reaction: C6H12O6 + 2 CO2 + - C2H5OH According to the law of conservation of mass, what number should go in the blank? A. 2 B. 4 C. 1 D. 3

Both white phosphorus and red phosphorus are made up only of phosphorus atoms. Does this mean they are both pure substances? Could they be compounds?

Given that the molar mass of NaCl is 58.44 g/mol, what is the molarity of a solution that contains 87.75 g of NaCl in 500. mL of solution? moles of solute Use molarity - liters of solution

What are 3 ways to seperate metal particles and salt

Sarah heated some orange coloured crystals in a test tube. The crystals turned green and fizzed. After the fizzing stopped, the test tube was allowed to cool. A green powder was left in the tube.

In which orbital does an electron in a bromine atom experience the greatest effective nuclear charge?

Kool-Aid is made up of sugar (C6H12O6), food coloring, and water. It is an example of a (n) element heterogeneous mixture homogeneous mixture compound