4. For a reaction to occur, energy must be_

__ to break chemical bonds.

Write the chemical equation for the formation of HI from the single, isolated H and I atoms.

Naturally occurring copper has two isotopes, 63cu and 65cu. what is different between atoms of these two isotopes?

What is the biggest goal of science

The density of 300 mL of water was determined, and then 15 grams of sodium nitrate was dissolved in the water. The student determined the density of the aqueous solution and recorded the collected data in a table.

Air is made up of gas particles. These particles exert pressure on every object they collide against. This pressure is known as air pressure. Which of the following statements about air pressure is true?

What element with the highest electronegativity value? Cesium calcium helium fluorine

How many neutrons and electrons are in Oxygen⁻¹⁷ isotope?

What is science all about?

What type of change is a substance that changes form but remains the same?

Which side of the mountain experiences high temperature in windward or leeward