Which of the following materials is a metalloid or semi-metal (has some metallic properties and some properties similar to non-metals) ?

Group of answer choices

Na

silicon (Si)

NaCl

selenium (Se)

A diamond contains 5. 1021 atoms of carbon. What amount (moles) of carbon are in this diamond?

In a copper wire, a temperature increase is the result of which of the following

If lavoisier heated 100 grams of powdered mercuric oxide to produce 93 grams of liquid mercury, how much oxygen would be released

Which of the following must be the same in atoms of the same element? (Ex: all atoms of silver) A. number of protons B. atomic number C. atomic mass D. number of neutrons E. number of electrons F. charge

What is the formula for the compound copper (ii) sulfate pentahydrate?

Calculate the energy released in the following fusion reaction. The masses of the isotopes are: 14N (14.00307 amu), 32S (31.97207 amu), 12C (12.00000 amu), and 6Li (6.01512 amu).

How many grams of carbon dioxide are produced from 0.98 mol of Fe3O4?

There is inverse relation between pressure and diffusion in liquid phase? •True •False

What do you need in order to do a stoichiometric calculation? (Choose multiple) Balanced Chemical Equation Molar masses of compounds involved The type of reaction taking place Oxidation Numbers

The correct mathematical expression for finding the molar solubility (s) of sn (oh) 2 is: