If a sample of matter cannot be separated by physical means, what can be said with certainty about that sample?

A It is a pure substance.

B It is an element.

C It is a compound.

D It is a mixture.

What is the molarity of Cl - in each solution? a. 0.210 M NaCl b. 0.160 M SrCl2 c. 0.110M AlCl3

How do matter cycles demonstrate the conservation of matter in a system?

The elements beryllium, calcium, and strontium are all in group 2. What is the correct relationship of these elements regarding their ionization energy? A. Ca < Be < Sr B. Sr < Be < Ca C. Be < Ca < Sr D. Sr < Ca < Be E. Ca < Sr < Be

What particle is emitted when lead-214, 214 82 pb undergoes natural radioactive decay to bismuth-214, 214 83 bi?

The above shows a balloon full of gas which has a volume of 120.0 mL at 300.0 K. Assuming pressure remains constant, what is the volume of the balloon if the temperature of the gas increases to 320,0 K?

Which of the following is not a source of air pollution related to human activities

Objects and substances in motion is I

If you were to remove an electron from a sodium atom that has eleven protons, what would be the electrical charge of the ion?

The atomic mass of fluorine in 19.0 amu, so the molar mass is?

A rod shaped organism with no nucleus commonly found in Garbage will most likely belong to which kingdom