Compounds and Mixtures QUIZ 1

What is formed when an insoluble solid compound is produced in a chemical reaction?

• gas

• halogen

• precipitate

• water

Which type of bond is made when two atoms share two pairs of electrons?

• ionic bond

• triple covalent bond

• single covalent bond

• double covalent bond

Why are metals generally ductile, or able to be

pulled into wires?

• Metal ions form strong, rigid three-dimensional networks.

• Ions within the metal structure easily slide.

  past one another.

• The bonds between metal atoms are very

  strong and they stick tightly together.

• Valence electrons can flow freely through the

  material when there is an electric potential.

Why do metals and nonmetals tend to form ionic bonds?

• Metals have low electronegativities, so they transfer electrons easily to nonmetals, forming ionic bonds.

• Nonmetals have lower electronegativities than most metals, so they bond tightly together, creating ionic bonds.

• Metals and nonmetals have similar electronegativities and masses, so they share electrons when creating ionic bonds.

• Nonmetals and metals that are bonded have atomic masses so different that it causes them to form ionic bonds more easily.

Which statement describes how pressure affects the solubility of gases in liquids?

• It is unaffected by pressure.

• It increases with increasing pressure.

• It decreases with increasing pressure.

• It increases with decreasing pressure.

Which material has properties of both a conductor and an insulator?

• ceramics

• metals

• polymers

• semiconductors

Why do atoms form bonds?

• to become less stable

• to create a lower potential energy

• to create a higher potential energy

• to move farther away from each other

Engineers must optimize each stage of the life cycle of an engineered material to reduce the impact of the material on society and the environment. Which action would make the distribution stage more efficient?

• develop systems and processes to improve shipping and packing

• develop eco-friendly fossil fuel extraction methods

• design a recyclable material for the product

• reduce reliance on electricity for appliances

Which property must be known about each atom in order to draw an electron-dot structure?

• bond length

• atomic mass

• ionization energy

• number of valence electrons

Which of these compounds would likely conduct an electrical current if dissolved in water?

• Dioxygen, O2

• Gallium(III) nitrite, Ga(NO2)3

• Carbon tetrabromide, CBr4

• Dinitrogen tetroxide, N2O4