science

Terry fills two balloons with the same amount of helium gas. She places one of her helium balloons in the freezer.

After twenty minutes, she removes the balloon from the freezer and notices that it is smaller than the balloon that

stayed at room temperature. Her balloons are shown above.

How does Terry correctly explain the difference in

the size her balloons?

• She says that an increase in pressure increases

  the volume of helium gas.

• She says that a decrease in pressure decreases

  the volume of helium gas.

• She says that a decrease in temperature

  increases the volume of helium gas.

• She says that an increase in temperature increase the volume of the helium gas.

Using the periodic table, which of the following properties does Terry list for helium? Select all that apply.

• Helium is a metal.

• Helium is a metalloid.

• Helium is a nonmetal.

• Helium has 2 valence electrons.

• Helium has 4 valence electrons.

The chemical properties of calcium are MOST similar to the chemical properties of :

• Ar

• K

• Sc

• Mg

Which element is a member of the Halogen family?

• B

• I

• S

• K

Which sequence of atomic numbers represents elements that have similar chemical properties?

• 3,12,21,40

• 4,20,38,88

• 9,16,33,36

• 19,23,30,36

An atom of argon in the ground state tends not to bond with an atom of a different element because the argon atom has

• more neutrons that protons

• a total of two valence electrons

• more protons than neutrons

• a total of eight valence electrons.

The table shows the measurements of the volume and pressure of a portion of gas at a constant temperature. After graphing, the data reveals that the volume is

• inversely proportional to pressure

• directly proportional to pressure

• inversely proportional to pressure squared

• directly proportional to pressure squared

Which is the correct chemical formula for nitrogen (I) oxide?

• NO₂

• N₂O

• N₂O₃

• NO

Which of the following statements is true with regards to bond?

• Ionic bonds and covalent bonds have exactly the same properties.

• Ionic bonds require positive and negative charges, while covalent bonds require the sharing of electrons.

• Ionic bonds require the sharing of electrons, while covalent bonds do not.

• Ionic bonds and covalent bonds both require the transfer of protons and occur primarily between nonmetals.

One molecule of dinitrogen tetraoxide contains

• two nitrogen atoms and two oxygen atoms

• four nitrogen atoms and two oxygen atoms

• two nitrogen atoms and four oxygen atoms

• four nitrogen atoms and four oxygen atoms