Which of these cannot be decomposed into simpler substances?

What mineral is this? Egg-sized piece. Transparent pink color with glassy luster. Shows conchoidal fracture. The hardness is 7.

Mary is biking downhill. She notices that her shirt and hair begin to pull back on her and blow in the "wind" that she is creating as she moves faster. This "wind" is an example of which of the following forces that also acts on an airplane? O A.

Compare and contrast substances and mixtures with two examples

3) Atoms of which two elements have a combined total of 23 protons? A) Sodium, Na, and magnesium, Mg B) Boron, B, and carbon, C C) Copper, Cu, and zinc, Zn D) None of these

Define physical change and give an example

Transferring or sharing electrons between atoms forms

Ions that consist of a single atom are called ... ions

Ecosystems are clearly separated from one another. Where one ecosystem stops, another begins A: True B: False

Mass_mole relationship

What is the momentum of an 800-kg car | traveling at a velocity of 10 m/s? What is its momentum if it speeds up to 50 m/s?