24 - 25 Physical Science Test Questions

Front

How many total atoms are found in the reactant side of a chemical equation?

Back

The total number of atoms on the reactant side is the sum of all atoms present in the reactants. For example, in the equation 2H2 + O2 -> 2H2O, there are 4 hydrogen atoms and 2 oxygen atoms, totaling 6 atoms.

Front

What is an Alkaline Earth Metal?

Back

Alkaline Earth Metals are a group of elements in Group 2 of the periodic table, which includes Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra). They are known for being reactive and having two electrons in their outer shell.

Front

How many atoms are there in H2SO4?

Back

H2SO4 contains 7 atoms: 2 hydrogen (H), 1 sulfur (S), and 4 oxygen (O) atoms.

Front

What type of change occurs when fireworks explode?

Back

Fireworks exploding is a chemical change, as it involves a transformation that results in new substances being formed.

Front

What is solubility?

Back

Solubility is the ability of a substance to dissolve in another substance, typically a liquid. For example, sugar is soluble in water.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition (e.g., melting ice), while a chemical change results in the formation of new substances (e.g., rusting iron).

Front

What is the formula for calculating the total number of atoms in a compound?

Back

To calculate the total number of atoms in a compound, add the subscripts of each element in the chemical formula. For example, in H2O, there are 2 hydrogen atoms and 1 oxygen atom, totaling 3 atoms.

Front

What are the properties of metals?

Back

Metals are typically shiny, good conductors of heat and electricity, malleable, ductile, and have high melting and boiling points.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, which groups elements with similar properties together.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes a change during a chemical reaction, typically found on the left side of a chemical equation.