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WorksheetsCharacteristics of Chemical Reactions
Total questions: 34
Worksheet time: 18mins
Formed when two or more atoms chemically combine
Molecule
Atom
Reactant
Substance
A process that leads to the transformation of one set of chemical substances to another
Reactant
Chemical Reaction
Product
Molecule
Smallest part of a substance
Reactant
Product
Atom
Compound
The substances initially involved in a chemical reaction
Products
Atoms
Molecules
Reactants
The substance that is produced from a chemical reaction
Product
Reactant
Pure Substance
Molecule
In a chemical process, atoms that make up a substance are regrouped into different _____________________ to form new substances with different properties.
Molecules
Chemicals
Reactants
Atoms
A _____________________ increase or decrease and the production of light are both signs that a chemical reaction may have occurred.
Color
Temperature
Precipitate
Density
A _____________________ is a solid substance that forms and separates from a solution and may indicate that a chemical reaction has occurred.
Odor
Reactant
Product
Precipitate
An unexpected change in _____________________ is a sign that a chemical reaction may have occurred.
Mass
Color
Solid
Gas
Substances giving off a smell, or ________________, while being combined is also an indicator of a chemical reaction.
Color
Precipitate
Odor
Texture
Which of the following is the best description of the results of a chemical reaction?
A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms
A new substance with different properties is formed.
The substance seems to disappear after dissolving in water.
Molecules split into Protons and Neutrons
Rust forming on a piece of iron is an example of which of the following:
A physical change because the process can be reversed
The natural process of decay as metallic ions age
A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms and there was a color change
Which of the following statements is true?
Cutting paper is an example of a chemical reaction because a new substance is formed and the process cannot be undone.
Burning paper is an example of a chemical reaction because a new substance is formed and the process cannot be undone.
Melting ice is an example of a chemical reaction because a new substance is formed and the process cannot be undone.
Sugar dissolving in water is an example of a chemical reaction because a new substance is formed and the process cannot be undone.
_______________ is a property that can be used to identify an unknown substance.
Color
Mass
Density
Gas
Each ____________________ has characteristic physical and chemical properties that can be used to identify it.
Pure Substance
Molecule
Color
Chemical Reaction
When a chocolate bar melts, the chemical properties of that substance are
The same
Different
If a chemical reaction occurs, the properties of substances before and after the substances interact must be ________________________.
Different
The Same
A property that is observed without making changes to the substance
Chemical Property
Molecular Property
Reactivity
Physical Property
Which of the following is good evidence that an unknown sample is a pure substance?
After leaving a liquid to settle, it separates.
After leaving a liquid to settle, it does not separate.
After evaporating a liquid, there is nothing left behind.
Which of the following is NOT an indicator of a chemical reaction?
A temperature change
Phase or state of matter change
A color change
Production of light
Which of the following is true about how hydrogen and oxygen can combine to form molecules?
Hydrogen and oxygen always form hydrogen peroxide
Hydrogen and oxygen can combine in many ways to form different molecules
When oxygen combines with hydrogen to make a molecule, water will always be produced.
Molecules composed of hydrogen and oxygen must have at least four atoms
Which of the following best explains the relationship between molecules and atoms?
Atoms are molecules that have a charge.
Atoms have smaller parts, called molecules.
Molecules are made up of two or more atoms.
Molecules are atoms that have no mass.
Graphite is a soft, dark material often used as a lubricant. Diamond is often a clear, hard crystal. Which of the following best explains the difference in these materials?
The arrangement of the atoms of each one
The elements of which each one is made
The number of atoms each one is made of
The size and shape of the individual atoms
The basic building block of matter; made of electron(s), proton(s), and neutron(s)
Matter
Molecule
Atom
Crystal
The smallest unit of a compound
Matter
Molecule
Atom
Crystal
Solid material whose atoms are arranged in an ordered pattern
Matter
Molecule
Atom
Crystal
Anything with both volume and mass
Matter
Molecule
Atom
Crystal
A __________ has a definite volume and definite shape.
Solid
Liquid
Gas
A __________ has a definite volume and indefinite shape.
Solid
Liquid
Gas
A __________ has a indefinite volume and indefinite shape.
Solid
Liquid
Gas
____________ have a positive charge,
Protons
Neutrons
Electrons
Quarks
____________ have a negative charge,
Protons
Neutrons
Electrons
Quarks
____________ have no charge,
Protons
Neutrons
Electrons
Quarks
A substance in which other substances are dissolved into.
Solute
Solvent
Mixture
Solution
