Write the symbol for every chemical element that has atomic number less than 14 and atomic mass greater than 23.3 u.

Enlista cuatro compuestos del carbono, naturales y sintéticos, de uso en la vida cotidiana.

What happens if atoms lose energy during a change of state? The atoms are pushed apart by repulsive forces and become less organized. The atoms are pulled together by attractive forces and become less organized.

A weighed piece of magnesium ribbon is added to a dried crucible, which is reweighed and heated in air to form the compound MgO. The crucible is cooled and reweighed to find the mass of MgO.

When an atom in a reactant gains electrons, what happens to its oxidation number? A). Its oxidation number decreases. B). Its oxidation number doubles. C). Its oxidation number increases. D). Its oxidation number increases by one. E).

Which process is a chemical change? breaking of glass formation of frost magnetization of an iron nail loss of atmospheric ozone

Consider the balanced equation for the following reaction: 3Ca (ClO3) 2 (aq) + 2Li3PO4 (aq) → Ca3 (PO4) 2 (s) + 6LiClO3 (aq) Determine the theoretical yield of LiClO3 (aq) in grams if the percent yield of LiClO3 (aq) is 81.0% and 9.

What is the total number of valence electrons in a sulfide ion in the ground state? (1) 8 (3) 16 (2) 2 (4) 18

Write the name and formula of the compound made of magnesium and fluorine

How was or wasn't the scientific method followed in this experment

1‑propanol (nn ‑propanol) and 2‑propanol (isopropanol) form ideal solutions in all proportions. Calculate the partial pressure and the mole fraction (yy) of the vapor phase of each component in equilibrium with each of the given solutions at 25 °C.