How is a pure substance different from a mixture?

A

Pure substances cannot be separated by physical means

B

Mixtures cannot be separated

C

A pure substance is heterogeneous

D

A mixture is made of one substance

Explain why it is unlikely that life could exist on a planet where the main liquid is methane, a nonpolar molecule that does not form hydrogen bonds

A certain element forms an ion with 10 electrons and a charge of + 2. identify the element.

What is the definition for water displacement?

Sometimes, based on the electron configurations of the elements involved, a possible chemical formula for a compound can be predicted. Elements A ([core]ns2) and B ([core]ns2np5) react to form ionic compound AxBy.

A salt will always precipitate out of solution when it is produced. true false

Draw the condensed structural formula for the ammonium salt formed when lidocaine reacts with hcl.

Where might you find a temperature of 2 kelvin? a. north poleb. the equatorc. earth's cored. the coldest regions of outer space

A blank is a coil of wire that produces a magnetic field when it carries an electric current

What is the change in heat energy when 132g of copper at 32.2°C is raised to 45.0oC? The specific heat of copper is 0.385 J/g °C.

Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. which one of these molecules contains polar bonds?