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
Answers: 2
Chemistry, 22.06.2019 07:30
The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.
Answers: 1
Chemistry, 22.06.2019 19:00
A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.
Answers: 1
Which statement best represents the law of conservation of matter with regard to chemical reactions?...
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