Name 4 differences between chemical and physical changes

Why would it be difficult to determine the climate of a place based on one days measurements

Scientists noticed that the ozone layer was thinning. What was occurring at the same time?

Which type of reaction is Mg + S - > MgS a. polymerization b. synthesis c. replacement d. decomposition

Which of the following is a correct representation of the isotope of carbon that has 7 neutrons? carbon-7 carbon-13 carbon-6 carbon-12

Which equation best describes the net changes based upon the observation that solid silver nitrate and solid potassium chloride are soluble in water and these solutions react to form insoluble silver chloride and soluble potassium nitrate when mixed?

What will happen if the concentration of water inside a cell is higher than the concentration of water outside a cell?

During a lab, you heat 1.04 g of a niso4 hydrate over a bunsen burner. after heating, the final mass of the dehydrated compound is 0.61 g. determine the formula of the hydrate and also give the full name of the hydrate.

Which molecule is a source of energy, a store of energy, and can mix with water?

How many atoms will you find in 2.0 moles of he?

An atom of nitrogen has seven electrons. Which diagram correctly respresents the arrangement of these electrons?