1. Why are many different tools needed for space exploration

Determine the number of protons, electron and neutrons present in an atom of magnesium

When a substance freezes, what happens to the mass? The mass stays constant as it changes from a liquid to a solid. The mass increases as it changes from a liquid to a solid. The mass decreases as it changes from a liquid to a solid.

What is the symbol of a sodium ion, Na, followed by the formula of a sulfate ion, SO42-

Elements in the second group have 2 outer shell electrons and are also very reactive they are called ...

Thermal decomposition of sodium azide (NaN₃) into nitrogen gas and sodium metal is used to inflate car airbags. The reaction proceeds by the following chemical reaction. 2NaN₃ (s) ⟶3N₂ (g) + 2Na (s) How many grams of NaN₃ are need to inflate a 10.

A certain element forms an ion with 54 electrons and a charge of + 2. identify the element.

Which is a substance that could be found in air, water, or soil that is harmful to humans or animals?

9. Which states of matter can flow?

One of the main ideas of the Quantum Theory is that: the energy of an electron can never be changed the energy of an electron can be varied by any amount the energy of an electron can be changed only by set amounts the energy of an electron can

ATP is a source of free energy that drives unfavorable reactions. Which of the processes are coupled to the dephosphorylation of ATP?