Is na2S an ionic compound, covalent compound, or acid

What is mechanical weathering? How do water, ice, wind, and organisms cause mechanical weathering? How can organisms and wind cause it? Type out an explanation of why that answer is correct

A car accelerates from a standstill to 60ft/s in 10 seconds what is it's acceleration

Mason notice that his boat sinks lower into the water in a freshwater lake than in the ocean what could explain this

How many times is CO2 denser than H2? A 22 times B 1.96 times C 0.089 D they have the same density because they are both gases E cannot be calculated

Aluminum + sulfur - --> aluminum sulfide

Sarah heated some orange coloured crystals in a test tube. The crystals turned green and fizzed. After the fizzing stopped, the test tube was allowed to cool. A green powder was left in the tube.

In which orbital does an electron in a bromine atom experience the greatest effective nuclear charge?

Kool-Aid is made up of sugar (C6H12O6), food coloring, and water. It is an example of a (n) element heterogeneous mixture homogeneous mixture compound

A laboratory experiment requires 250 millimeters of water for boiling. It also requires 100 millimeters of water for a cooling process.

Which set of procedures and observations indicates a chemical change? A) Ethanol is added to an empty beaker and the ethanol eventually disappears. B) A solid is gently heated in a crucible and the solid slowly turns to liquid.