(Q).
Q: The electrons in a water molecule are more concentrated around the more highly charged oxygen nucleus than around this? Choices: - helium nuclei - carbon nuclei - peroxide nuclei - hydrogen nuclei A:
(A).
hydrogen nuclei

(Q).
Q: In a hot water heater, burning fuel causes the water to get hot because combustion is what type of reaction? Choices: - endothermic - geothermal - biochemical - exothermic A:
(A).
exothermic

(Q).
Q: What do you call materials that have high resistance to electric current? Choices: - conductors - semiconductors - destructive insulators - electric insulators A:
(A).
electric insulators