Answer the following question given this paragraph: The emission spectrum of hydrogen is discontinuous. The spectrum is made up of discrete lines representing transitions of the hydrogen electron between specific energy levels within the atom. Q: The spectrum is made up of discrete lines representing transitions of the hydrogen electron between specific energy levels within what? Choices: - a rainbow - an element - the molecule - the atom A:
the atom

Answer the following question given this paragraph: Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons. Q: How many valence electrons does carbon have? Choices: - one - five - two - four A:
four

Answer the following question given this paragraph: Vitamins are organic compounds that the body needs in small amounts to function properly. Humans need 13 different vitamins. Some of them are listed below ( Table below ). The table also shows how much of each vitamin you need every day. Vitamins have many roles in the body. For example, Vitamin A helps maintain good vision. Vitamin B 9 helps form red blood cells. Vitamin K is needed for blood to clot when you have a cut or other wound. Q: What are the organic compounds that the body needs in small amounts to function properly; humans need 13 different ones? Choices: - minerals - proteins - nutrients - vitamins A:
vitamins

Answer the following question given this paragraph: Q: What causes blood vessels to grow toward the tumour in cancer cells? Choices: - harnessing molecules - addressing molecules - communicating molecules - signaling molecules A:
signaling molecules