Descibe the probable causes of two mass extinctions.

What does the electron cloud model describe? A. the most likely locations of electrons in atoms B. the precise locations of electrons in atoms C. the number of electrons in an atom D. the mass of the electrons in an atom

All organisms use oxidation-reduction reactions to harness energy, and this newly harvested energy is used to produce atp. oxidation is defined as the loss of electrons. reduction is the gain of electrons.

Which of the following describes an important role scientists have in society?

The p sub shell can hold up to 8 electrons in an atom. true or false?

In ionic bonding an arrow is often drawn on the diagram. What does the arrow show? A) How the ion forms B) The direction of the reaction C) The direction the electrons move to form the ions D) How the protons move

Which best describes a compound? O A elements that are chemically combined B elements that are physically combined c. elements that can be broken down into atoms D. elements that cannot be broken down into atoms

What term matches this definition - negatively charged particle in an atom?

A european automobile has a gas mileage of 14 km/L. What is the gas mileage in miles per gallon? Given-1mi=1.6093 km

Convert 1.21 kg to grams

Which of the following are inputs for the process of photosynthesis