Validate how valence electrons determine the chemical reactivity of an element: give 2 examples of elements with high reactivity and justify your response.

Ali runs a paper chromatography experiment using the same ink, but three different solvents. Solvent A separates the components into three bands, solvent B separates it into two bands, and solvent C does not separate the ink.

What happens to the total amount of matter and energy during a chemical reaction?

Which statement accurately describes the location and charge of the electrons in an atom? The electrons are inside the nucleus and have no charge The electrons are outside the nucleus and have no charge The electrons are inside the nucleus and have

John weighs 115 kg. Sally weighs 115 lb. Who is heavier of the two?

Which of the following orbitals is possible in an electron configuration? 4p 1p 3f O 2d

How does molecular size affect solubility

Is mass conserved when 200 g of water undergoes a physical change? Use complete sentences to support your answer by explaining how this can be demonstrated.

For wach of the following cases, state whether the density of the object increases, decreases, or remains the same: (a) A sample of chlorine gas is compressed (b) A lead weight is carried up a high mountain. (c) A sample of water is frozen.

A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. In an experiment, a 0.

The state of matter for an object which has a definite volume but not a definite shape is ... Solid state Liquid state Gaseous state