(Question)
Q: What is the name of an element with a different number of neutrons? Choices: - mineral - reaction - solution - isotope A:
(Answer)
isotope

(Question)
Q: What is an interesting example of a molecule with two central atoms, which are both c atoms? Choices: - chloride - water - sulfur - acetylene A:
(Answer)
acetylene

(Question)
Q: What produces the centripetal force to keep the earth orbiting the sun? Choices: - heat - motion - weight - gravity A:
(Answer)
gravity