All of the following are signs of chemical change except

fizzing

sound production

melting

heat production

Which separation technique is used to separate carbon particles suspended in air

What are two different kinds of rock that are easily weathered by carbonic acid?

a certain quantity of gas occupies a volume of 0.1 L when collected over water at 288 K and a pressure of 0.92 bar. the same volume of gas occupied a volume 0.85 L at S. T. P in dry conditions. Calculate the aqueous tension at 288K.

How does radioactivity make it possible to understand how earth can be so old and still have a hot interior?

The electron affinities of the elements from aluminum to chlorine are - 44, - 120, - 74, - 200.4, and - 384.7 kJ/mol, respectively. Rationalize the trend in these values.

Why does the sky change colors at sunset? 1 because the sun changes colors 2 because the atmosphere reflects colors 3 because long wavelengths are scattered the least 4 because short wavelengths are scattered the least

Consider the reaction N2 (g) + 3 H2 (g) 2 NH3 (g), which is exothermic as written. What would be the effect on the equilibrium position of adding N2 (g) ?

According to Table I, which equation represents a change resulting in the greatest quantity of energy released? 1. 2C (s) + 2H2 (g) - > C2H4 (g) 2. 2C (s) + 3H2 (g) - > C2H6 (g) 3. N2 (g) + 3H2 (g) - >2NH3 (g) 4. N2 (g) + O2 (g) - > 2NO (g)

Calculate the number of liters in 3.25 g of ammonia

Adding drops of food coloring to a beaker of water more organized system?