What are five kinds of evidence you can use to determine if a chemical reaction has occurred?

Why is hydrogen chloride (HCl) polar? it has equally shared electrons it has unequally shared electrons it has bent asymmetry it has linear symmetry

Why does water boils at a higher temperature than a non-polar solvent like ether?

What pressure would have to be applied to a 27.2-mL sample of gas at 25 °C and 1.00 atm to compress its volume to 1.00 mL without a change in temperature?

Which atom attracts electrons most strongly when bonded? oxygen (O) magnesium (Mg)

If the pressure of a sample of gas is doubled at constant temperature, what happens to the volume of the gas?

Ammonia (NH3) burns in air to form nitrogen dioxide and water. Calculate grams of nitrogen dioxide produced if 4.0 grams of ammonia are consumed

What year did mendeleev organized his periodic table in order of increasing atomic number

What is the volume of 1.9 moles of chlorine gas (Cl2) at standard temperature and pressure (STP) ? 12 L 22.4 L 43 L 81 L

This decomposition is first order with respect to phosphine, and has a half‑life of 35.0 s at 953 K. Calculate the partial pressure of hydrogen gas that is present after 70.5 s if a 2.20 L vessel containing 2.

A new element has two isotopes, one with a mass of 40.0 amu and the other with a mass of 42.0 amu. the atomic weight is 40.50 g/mol. pick the true statement a. the isotope at 42.0 amu is less abundant b. the element has 19 protons and 21 neutrons c.