Chemistry Semester 1 Final

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat or light to its surroundings.

Front

What substance heats up the fastest when exposed to sunlight?

Back

Sand heats up the fastest due to its low specific heat capacity.

Front

Why did Mendeleev place question marks in his periodic table?

Back

He predicted that future elements would be found that would fit in those spaces.

Front

What happens when you add a proton to an atom?

Back

Adding a proton changes the element to a new element, as the atomic number increases.

Front

What is the relationship between valence electrons and ionization energy?

Back

As the number of valence electrons increases, the ionization energy also increases.

Front

Define combustion in chemistry.

Back

Combustion is a chemical reaction that typically involves the reaction of a substance with oxygen, producing heat and light.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number and grouped by similar properties.

Front

What is ionization energy?

Back

Ionization energy is the energy required to remove an electron from an atom or ion.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical equilibrium?

Back

Chemical equilibrium is the state in which the concentrations of reactants and products remain constant over time in a reversible reaction.