State the trend in electronegativity for the halogens as these elements are considered in order of increasing atomic number

1. Which metal is the most reactive? How do you know this?

A 20.4 g aluminum sphere and a 49.4 g iron sphere are both added to 75.2 mL of water contained in a graduated cylinder. what is the new water level, in millileters in the cylinder?

Why dont we include the mass of an atoms electrons in the atomic mass?

What would occur if some of the red blood cells were placed in beaker C/plasma? Recall that red blood cells normally float in plasma. A The concentration of water inside and outside the cells would be equal, so no diffusion would occur.

Marie and Calvin dissolved 10 grams of KNO3 in 100 grams of water at 25oC. Next they added 5 grams more. Calvin told Marie that they could continue to add solute until they reached 40 grams because the solution was still

A radioisotope used for diagnosis must emit gamma rays of sufficient energy to escape from the body and it must have a half-life short enough for it to decay away soon after imaging is completed. TRUE FALSE

Silicon is lustrous and is a conductor of heat and electricity. Which class of elements could this element belong to? A. Metal B. Non-metal C. Metalliod D. All of the above

What type of mixture is 100 ml of water with a little bit of salt?

In the process of covalent bonding, atoms share electrons. This means that * a) Electrons from each atom are attracted to the nucleus of both atoms b) Protons and neutrons attract c) Atoms lose electrons and become ions d) Atoms gain electrons and

5. How are compounds different from mixtures?