Which statement best represents the law of conservation of matter with regard to chemical reactions?(1 point)
The reactants and products have different types of atoms, but the number of each atom is the same.
.The reactants and products have the same number and type of atoms, but the atoms may be recombined.
The reactants and products have the same number and type of atoms, and the atoms are not recombined.
The reactants and products have different numbers of atoms, but the types of atoms are the same.
A coefficient serves which purpose in a chemical equation?(1 point)
It shows how many atoms are in a chemical molecule.
It shows how many atoms there are of a particular element.
It shows how many molecules there are of a particular substance.
It shows how many atoms there are of a particular element inside of a molecule.
Sodium hydroxide (NaOH) and hydrochloric acid (HCl) combine to make table salt (NaCl) and water (H2O). Which equation is balanced?(1 point)
2NaOH + HCl → NaCl + H2O
NaOH + HCl → NaCl + H2O
NaOH + 2HCl → NaCl + H 2 O
2NaOH + 2HCl → 2NaCl + H2O
Which statement is true?(1 point)
Atoms are added and removed during chemical reactions.
Atoms always remain intact during chemical reactions..
Molecules are added and removed during chemical reactions.
Molecules always remain intact during chemical reactions.
Use the equation to answer the question.
CH4 + _____Cl2 → CCl4 + _____HCl
Which numbers balance this equation?(1 point)
1, 2
4, 4
3, 2
2, 4
