Could a mixture be made up of only one element and no compounds

What is ecology!

If a system requires 150 J of input work and produces 123 J of output work, what's its efficiency? A. 72% B. 122% C. 82% D. 92%

Zn (s) + 2 HCl (aq) →ZnCl2 (aq) + H2 (g) Zn (s) reacts with HCl (aq) according to the equation shown above. In trial 1 of a kinetics experiment, a 5.0g piece of Zn (s) is added to 100mL of 0.10MHCl (aq).

Is copper or silver more reactive?

Which ions contribute to alkalinity

Which option is true about the effect of polarity on solubility? Select all that apply. Polar solutes dissolve better in water than in oil. Polar solutes have the greatest solubility in nonpolar solvents.

Which change results in a release of energy? 1. The melting of H₂O (S) 2. The boiling of water (L) 3. The evaporation of H₂0 (L) 4. The condensation of H₂0 (G)

What changes nitrogen gas in the air to nitrogen compounds that fall to the ground

Which element has an isotope mass number of 32 and is used as an ecological tracer?

Which laws can be combined to form the ideal gas law? Boyle's law and Charles's law Gay-Lussac's law and Avogadro's law Charles's law, Avogadro's law, and Boyle's law Dalton's law, Gay-Lussac's law, and Avogadro's law