< Question 7 of 31 > Attempt 2
Classify the phrases pertaining to pure substances and mixtures as either true or false.
True
False
Answer Bank
Pure substances cannot be separated by physical means.
The components of a homogeneous mixture are chemically combined.
Homogeneous mixtures have uniform properties throughout.
Heterogeneous mixtures contain more than one part, and each part has its own properties.

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied