What is the total number of electron pairs that are shared between the two carbon atoms in a molecule of ethyne?

(1) 1 (3) 3

(2) 2 (4) 4

Which characteristics of a cloud in the sky might qualify it as a living thing?

How many grams of Br contain 8.94 * 1021 atoms of atomic bromine?

Under which conditions will sugar most likely dissolve fastest in a cup of water? a a sugar cube with stirring at 5°C b a sugar cube without stirring at 15°C c sugar crystals without stirring at 5°C d sugar crystals with stirring at 15°C

Copper has a density of 8.96 g/cm3. If 75.0 g of copper is added to 50.0 mL of water in a graduated cylinder, to what volume reading will the water level in the cylinder rise?

Why do subscriptions of certain elements change between the reactant and the products

If a sample of gas occupies 400 ml at a pressure of 800 mm Hg, what will be it's volume if the pressure is reduced to 700 mm Hg

Why are water storage tanks usually built on towers or hilltops?

What is convection cell

One example of a decomposition reaction is the electrolysis of water. the chemical reaction can be expressed by the equation 2 h2o →2 h2 o2. the reactant (s) of this chemical reaction is/are?

When the positive ion of one compound replaces the positive ion of another compound?