What does elements and mixtures mean

Which general trend is found in Period 3 as the elements are considered in order of increasing atomic number? (1) increasing atomic radius (2) increasing electronegativity (3) decreasing atomic mass (4) decreasing first ionization energy

1s22s22p63s33p4 is the electron configuration of?

Calculate the mass of ethylene glycol (C2H6O2) that must be added to 1.00 kg of ethanol (C2H5OH) to reduce its vapor pressure by 12.0 torr at 35∘C. The vapor pressure of pure ethanol at 35∘C is 1.00*102 torr.

Lithium aluminum hydride reduces carboxylic acids to primary alcohols via what intermediate? A) a ketone. B) a methyl ester. C) an aldehyde. D) a secondary alcohol. E) an acid chloride.

Which of the following is not true? Newton's Laws include three laws about force and motion. An object will not change velocity unless acted upon by a force. Every action has an equal and opposite reaction.

How many atoms are in 1.25 moles of calcium acetate, ca (c² h³ o²) ²?

What is a physical change? A change in matter from one form to another without becoming a new substance. A change in matter that results in a chemical reaction. A change in matter that results in the smallest unit of a compound.

You are in the room with several objects, the temperature in the room is 21 celcius, what can you assume about the temperatures of the objects in the room?

If a sample contains 74.0% of the R enantiomer and 26.0% of the S enantiomer, what is the enantiomeric excess of the mixture?

In a solution, the solvent particles are attracted to the solute particles by: a) ion/dipole forces b) dipole/dipole forces c) van der Waals forces d) any or all of these forces