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Compare and contrast mixtures and compounds. Which statement is true about mixtures and compounds?
1. Mixtures and compounds are the same throughout.
2. Mixtures and compounds are made of two or more elements in a definite proportion.
3. Mixtures must be separated by chemical methods and compounds by physical methods.
4. Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.
$MgF_2$ is an example of a(n)
1. Ionic bond
2. Metallic bond
3. Covalent bond
4. Noble bond
A chemical bond is
1. a group of atoms that are joined together
2. the basic particle of matter
3. the force that holds two atoms together
4. a substance formed from the chemical combination of two or more atoms
Which of these is an immiscible substance?
1. potassium carbonate
2. sodium chloride
3. oil
4. (a) and (b)
A chemical bond is
1. a group of atoms that are joined together
2. the basic particle of matter
3. the force that holds two atoms together
4. a substance formed from the chemical combination of two or more atoms
What holds sodium chloride crystals together?
1. covalent bonds
2. ionic bonds
3. a sea of electrons
4. metallic bonds
The two major categories of matter are?
1. Atoms and molecules
2. Homogeneous and heterogeneous mixtures
3. Mixtures and substances
4. Elements and compounds
The ways in which an atom can bond with other atoms is determined by the
1. number of energy levels of the electrons.
2. number of valence electrons.
3. shape of the valence electrons.
4. period in which the atom falls.
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