What element is represented by: 1s^2

Calcium is a native metal. t or f

How many molecules are in h2o2

Which of the following is not a correct chemical equation for a double replacement reaction? 2 HNO3 + Mg (OH) 2 yields 2 H2O + Mg (NO3) 2 H3PO4 + 3 NaF yields 3 HF + Na3PO4 2 KNO2 + BaSO4 yields K2SO4 + Ba (NO2) 2 Ca + 2H2O yields Ca (OH) 2 + H2

How many grams of glucose are in 11.5 moles?

How can light be emitted from an atom in ground state

Which of the following is true? A) Gas atoms subjected to electricity emit bright lines of light. B) Gas atoms absorb white and emit a continuous spectrum of light. C) Gas atoms under high pressure emit dark lines against a continuous spectrum.

What common household element can, over time, reduce airflow, insulate components, reduce heat exchange or even cause the system to hang or reboot?

Clouds that form at an elevation of 3 kilometers will most likely be composed of A) raindrops B) ozone C) ice crystals D) sleet

Describe how glacial erosion influenced the topography of Ohio.

Which of the answer choices lists a compound? h2, h2o, NaCl, or O2