Atoms Review: Question Preview (ID: 27225)


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Two or more substances are mixed together but NOT checmically combined.
a) mixture b) compound c) atom d) molecule
Which of the following is an example of an element?
a) (O2 + CO2) b) Si c) H2O2 d) CO2
Elements have _________ charge
a) negative b) positive c) no d) elemental
The atomic mass is equal to ....
a) protons + electrons b) protons + mixture c) protons+ neutrons d) electrons + compounds
A substance in which two or more elements are chemically combined
a) atom b) molecule c) mixture d) compound
The number of protons is equal to the ....
a) atomic mass number b) atomic number c) atomic weight d) none of these
Subatomic particle with a negative charge; found orbiting the nucleus in the energy shells/cloud
a) element b) mixture c) atom d) electron
The smallest unit of an element that retains the properites of that element
a) Compound b) atom c) atom mass number d) periodic table
Which of the following is a compound?
a) Si b) CO2 c) (O2 + CO2) d) (N2 + O2)
Small particles within the atom
a) Subatomic particles b) atomic submaterial c) Compound d) mixture
A subatomic particle found in the nuclues with a positive charge.
a) neutron b) proton c) electron d) atom
A subatomic particle found in the nucleus with a neutral charge (no charge)
a) nucleus b) proton c) neutron d) electron
Which of the following is a mixture?
a) H2O2 b) (O2 + CO2) c) Si d) CO2
Which of the following is the best discription of a solid?
a) has a definite shape, does not have a definite volume, the molecules are moving fast and are far apart. b) has a definite shape, does not have a definite volume, the molecules are moving slowly and are far apart. c) has a definite shape, it has a definite volume, the molecules are moving slowly and are close together. d) it does not have a definite shape or volume, it takes the shape of the container it's in and the molecules move very quickly
Which best describes a liquid?
a) It has a definite shape, but not a definite volument the molecules are moving fast and are relatively far apart. b) It does not have a definite shape (it takes the shape of its container) the molecules are moving at a medium speed. c) does not have a definite shape or volume the molecules are moving very fast and are very far apart. d) none of these
Which of the following describes a gas?
a) no definite shape or volume, the particles move fasest and are spread the furthest apart. b) It does not have a definite shape (it takes the shape of its container) the molecules are moving at a medium speed. c) a definite shape , a definite volume, the molecules are moving slowly and are close together. d) invisible, we know nothing else about it.
How do we calculate density?
a) Density is equal to the volume divided by the mass b) Density is equal to the mass divided by the volume c) Density is equal to mass times acceleration d) none of these
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