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WorksheetsUnit 2 Review
Total questions: 25
Worksheet time: 15mins
The __________________ properties of a substance can be observed or measured without chemically changing the substance.
Chemical
Physical
Anything that has mass and takes up space is called _________________________.
Mass
Volume
Matter
Molecules
Which subatomic parts of an atom move around the outside of the nucleus?
Protons
Neutrons
Electrons
Rust forming on a car left outside is an example of a _____________________________ change.
Physical
Chemical
Element
Molecule
Compound
Both- Molecule & Compound
The following are signs that a ______________ reaction has occurred: gas is produced, a color change occurs, or if heat or light are produced.
Physical
Chemical
The state of matter in which the particles spread apart, fill ALL the space available to them, and have high thermal energy is the _____________________________ state.
Solid
Liquid
Gas
Luster, odor, electrical conductivity, and melting point are all examples of a ______________________ property.
Physical
Chemical
Atoms are made of what subatomic particles? Check all that apply.
Protons
Neutrons
Positive
Electrons
Pure substances that CANNOT be broken down chemically or physically into other substances are called ______________________________.
Elements
Compounds
Molecules
The state of matter in which particles are the most tightly packed together and vibrate in place is called a ________________ state.
Solid
Liquid
Gas
NaCl and H₂O₂ are examples of _____________.
elements
pure substances
chemical formulas
Element
Molecule
Compound
Both- Molecule & Compound
Fiberglass and Kevlar are examples of
natural materials
synthetic materials
Which two subatomic particles combine to make up the atomic mass of an element on the periodic table?
Protons
Neutrons
Electrons
In an atom, the number of protons equals the number of ________________________.
electrons
mass
atomic weight
atomic number
A property of matter that can only be observed when one substance changes into another substance is a ___________________ property.
physical
chemical
Element
Molecule
Compound
Both- Molecule & Compound
Cotton, wool, and silk are examples of what kind of materials?
Natural
Synthetic
When atoms chemically bond together, a new substance is created. The properties of the new substance are the same as the original atoms.
True
False
Element
Molecule
Compound
Both- Molecule & Compound
Checkmark all the signs that a chemical reaction has occurred in an experiment.
bubbles form
liquid changes to a solid
gas is produced
heat is produced
substances dissolves
Element
Molecule
Compound
Both- Molecule & Compound
How many protons are in Carbon?
6
12
18
How many neutrons are there in Gold?
79
118
197
276
