Q: Density is defined as the mass of an object divided by its what? Choices: - size - liquid - growth - volume A:
volume

Q: Alpha emission is a type of what? Choices: - radiation - heat - light - radioactivity A:
radioactivity

Q: Q: What structure does methane have? Choices: - two dimensional oxyhedra - two dimensional tetrahedra - three dimensional oxyhedra - three dimensional tetrahedra A:
A: three dimensional tetrahedra

Question: Q: What occurs when some substances change chemically to other substances? Choices: - toxic reaction - spontaneous mutation - hormonal reaction - chemical reaction A:
Answer: chemical reaction

*Question*
Q: What is the theory scientists use to explain the matter in the universe and how it's held together? Choices: - specific model - original model - organic model - standard model A:
**Answer**
standard model

Q: As with other organic compounds that form hydrogen bonds, water solubility of amines is reflected in the length of what? Choices: - hydrocarbon bonds - complex carbohydrates - nuclei chains - carbon chains A:
carbon chains