Which of the following could be classified as matter? Check all of the boxes that apply. desk water idea cloud helium dream

The Balmer series, named after Johann Balmer, is a portion of the hydrogen emission spectrum produced from the transitions between the n=2 energy level and higher energy levels.

How many moles of NO2 will form when 3.3 moles of Cu are reacted with excess HNO3?

Which of these is an example of a wetland area? A. marsh B. stream C. city park D. farm land

An airplane can fly at a height of 12.5km over the ground. How high is this in centimeters

Which one of the following is a redox reaction? Al3 + (aq) + PO43 - (aq) → AlPO4 (s) NaCl (aq) + AgNO3 (aq) NaNO3 (aq) + AgCl (s) 3Mg (s) + 2FeCl3 (aq) → 3 MgCl2 (aq) + 2Fe (s) LiCl (aq) + AgCH3CO2 (aq) → AgCl (aq) + LiCH3CO2 (aq) HF (aq) + KOH (aq)

Ocean constitutes most of ___ of water a) Evaporation b) Precipitation c) Condensation d) Transpiration e) Sublimation Don't choose a random letter.

In the reaction, Zn + HCl-> ZnCl2 + H2, 25 grams Zn are reacted with 17.5 grams HCl. How many grams of H2 will be produced? A. 0.382 g of H2 B. 0.479 g of H2 C. 0.7865 g of H2 D. 0.484 g of H2

Is nail varnish soluble?

What is the periodic trend for atomic size from top and bottom in a group? From left to right in a period?

Which planets' orbits is the belt located between the main asteroid belt?