Which of the following is the best description of the results of a chemical reaction?

A new substance with different properties is formed.

Chemical reaction occurs combining 1 atom of zinc, 2 atoms hydrogen, 2 atoms of chlorine. After the reaction, how many?

OPTIONS1 zinc, 2 hydrogen, 2 chlorine

Hydrogen and oxygen react to form water. At an atomic level, how do we know that a chemical reaction has occurred?

The hydrogen and oxygen atoms regroup into a new molecule.

Which of the following accurately describes the reactants and the products of a chemical reaction?

Products have the same# of atoms as the reactants &have different propertie

Rust forming on a piece of iron is an example of which of the following:

Chemical change: oxygen atoms from the atmosphere bond with the iron atoms

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Chemical Reactions Test

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Answers

1
Which of the following is the best description of the results of a chemical reaction?
The substance seems to disappear after dissolving in water.
A new substance with different properties is formed.
The reaction can be reversed to get back the original substance.
The substance changes from liquid to solid at a low temperature.
2
Chemical reaction occurs combining 1 atom of zinc, 2 atoms hydrogen, 2 atoms of chlorine. After the reaction, how many?
OPTIONS1 zinc, 2 hydrogen, 2 chlorine
2 zinc, 1 hydrogen, 2 chlorine
2 zinc, 2 hydrogen, 2 chlorine
3
Hydrogen and oxygen react to form water. At an atomic level, how do we know that a chemical reaction has occurred?
Oxygen atoms are much larger than hydrogen atoms.
The hydrogen and oxygen atoms regroup into a new molecule.
Hydrogen molecules are negative, and oxygen positive.
4
Which of the following accurately describes the reactants and the products of a chemical reaction?
The products contain a different number of atoms than the reactants
Products have the same# of atoms as the reactants &have different propertie
The number of atoms and the properties are different .
5
Rust forming on a piece of iron is an example of which of the following:
A violation of the laws of physics because new mass has been created
The natural process of decay as metallic ions age
Chemical change: oxygen atoms from the atmosphere bond with the iron atoms
A physical change because the process can be reversed
6
During a chemical reaction, substances (called reactants) are combined to form new substances (called products).
False
True

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