Why do elements in the same group have similar properties

Every organism requires a set of instructions that specifies its traits. Which statement best describes the hereditary information in a cell? A) Each chromosome contains a single gene. B) A gene, but not a chromosome, is made of DNA.

How did Bohr propose the particles within atom are arranged A. Protons and electrons form the nucleus with neutrons orbiting it B. Protons make up the atoms nucleus with electrons and neurons orbiting it C.

What is the correct formula name for calcium chloride? A. CaCl B. Ca2Cl C. CaCl2 D. ClCa2

If 32.0 g of MgSO4⋅7H2O is thoroughly heated, what mass of anhydrous magnesium sulfate will remain?

Which two elements make up water? oxygen and phosphorus oxygen and hydrogen hydrogen and sulfur hydrogen and phosphorush

The harder you strike a drum, the greater the sound's A) medium B) volume C) frequency D) pitch

The equation X + Y 2Z has the rate law equation shown below. Which of the following statements best describes the relationship of X on the rate of the reaction? rate = k[X]2[Y] Changing X has no effect on the reaction rate.

What moves in or out of a substance during a change of state?

2.5 moles of sodium chloride is dissolved to make 0.050 liters of solution

2. The minimized structure of phenacetin is planar, and the chemical shifts of the aromatic protons in the NMR spectrum can be rationalized by electron delocalization.