What is the group of elements with the same number of valence electrons?

A student has a flask containing two immiscible liquids. One of the liquids is a solution of a solid in water. Describe how you would separate the mixture into three separate components.

How do I balance CH4+O2=CO2+H2O in a chemical equation?

Why do elements in the same colum have similar properties?

If 50% of a radioactive element remains after 4000 years what is its half-life?

Which amino acid chain will be formed by the codons shown below? aag aga ugu?

What does pH measure? number of hydrogen atoms in an acid number of hydroxide atoms in a base concentration of hydrogen ions in solution concentration of hydroxide ions in solution

Based on charles's law, which of the following statements is true for an ideal has at a constant pressure and mole amount? A. The number of collisions is independent of volume B. The number of collisions decreases with increase in volume C.

50. mL of water is initially 70. k and cooled to 25. k. What is the thermal energy?

Which of the following statements is true about both nuclear fusion and nuclear fission? They occur in the sun. Heavy atoms are split. Two light nuclei combine. Some mass changes into energy.

What does the name iron (II) in a compound indicate about the cation? A an 11 + charge B a 2 - charge C a 2 + charge