1. what determines whether one metal will replace another metal from a compound in a single-replacement reaction?

2.distinguish between ionic and covalent bonds in terms of how each is formed.

3.perform the following operation. express your answers in the correct number of significant figures.

36.47cm + 2.721 cm + 15.1 cm

The correct answer to the following questions are these:

1. Displacement occurs when they is an obvious difference in reactivity for both your metals. If you got Rubidium and Sodium, obviously rubidium got the better reactivity, hence it will displace any sodium compound in any reaction unless u got something more reactive than rubidium.

2. A molecule or compound is made when two or more atoms form a chemical bond, linking them together. The two types of bonds are ionic bonds and covalent bonds. In an ionic bond, the atoms are bound together by the attraction between oppositely-charged ions. For example, sodium and chloride form an ionic bond, to make NaCl, or table salt. In a covalent bond, the atoms are bound by shared electrons. If the electron is shared equally between the atoms forming a covalent bond, then the bond is said to be nonpolar. Usually, an electron is more attracted to one atom than to another, forming a polar covalent bond. For example, the atoms in water, H2O, are held together by polar covalent bonds.

3. 54.291

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

Neither model is able to show the reactivity of potassium.