How are chemical and physical changes different on a molecular level?

Chemical changes involve the breaking of bonds in molecules.

Physical changes do not involve molecules.

Physical changes cause new molecules to form.

4. Which of the following statements is true? Chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not. Nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not.

Based upon elemental analysis, the empirical formula for an unknown compound was calculated to be CH2. Mass spectrometry analysis reveals the compound to have a molar mass of approximately 42 g/mol. What is the molecular formula for the compound

Why is carbon stable

How many neutrons does element X have if its atomic number is 25 and its mass number is 72?

If you have 6 moles of CH4 how many moles of H2O can be produced

Which stament best describes a solution

Which answer accurately describes the difference between speed and velocity? Read each answer choice carefully. Question 4 options: A. If speed is constant, then velocity is also constant. B. Speed requires direction.

Least reactive element of period 3

A chemical formula shows the kind and number of Atoms that form a what? compound, mixture, solution, or suspension

What gas was used as a deadly posiosn in world war 1?