How was it possible that Mendeleev was able to predict the properties of elements that no one knew about

Is this reaction endothermic or exothermic d) NH4NO3 (s)  NH4 + (aq) + NO3 - (aq) [Note, this is the reaction that takes place in a cold pack]

When a nucleus has too many protons it can be absorb an electron and create

The most important factor determining chemical properties for an element is?

Give names for the following compounds: A. Ag2S B. PdO C. PtCl4 D. V2O5

Rutherford's experiment conflicted with Thomson's model because it showed that A. the atom contains positively and negatively charged particles. B. the atom is composed of mostly empty space. C. the atom is full of a positively charged substance. D.

True or false forensic technicians receive OSHA data sheets regarding toxic chemicals they deal with in their lab.

What did robert boyle believe about atoms

Where do most carbon monoxide emissions come from?

The osmotic pressure exerted by a solution is equal to the molarity multiplied by the absolute temperature and the gas constant RSuppose the osmotic pressure of a certain solution is measured to be 22. atm at an absolute temperature of 353.

Which one of the following is a redox reaction?. 2 Na (g) + Cl2 (g) 2 NaCl (s) A. K2Cr2O7 (aq) + 2 KOH (aq) 2 K2CrO4 (aq) + H2O (l) B. H2O (l) H + (aq) + OH - (aq) C. Na2CO3 (s) + 2 HCl (aq) 2 NaCl (aq) + CO2 (g) + H2O (l) D.