Write the complete chemical formula (symbol and charge) for the positive ion present in each of the following ionic compounds.

a. KCl

b. CaS

c. $\text{MgF}_2$

d. $\text{Al}_2\text{S}_3$

Use inversion to turn the following statement into question.

Il fait mauvais aujourd’hui.

Potassium ions $\left(\mathrm{K}^{+}\right)$have a positive charge. What happens to a potassium atom's electrons when it becomes an ion?

$(a)$ An oxygen-$16$ ion with a mass of $2.66 \times 10^{-26} \mathrm{~kg}$ travels at $5.0 \times 10^6 \mathrm{~m} / \mathrm{s}$ perpendicular to a $1.20 \mathrm{~T}$ magnetic field, which makes it move in a circular arc with a $0.231 \mathrm{~m}$ radius. What positive charge is on the ion? $(b)$ What is the ratio of this charge to the charge of an electron? $(c)$ Discuss why the ratio found in $(b)$ should be an integer.

Give the formula of a negative ion that would have the same number of electrons as each of the following positive ions. a. $\mathrm{K}^{+}$ b. $\mathrm{Mg}^{2+}$ c. $\mathrm{Sr}^{2+}$ d. $\mathrm{Cs}^{+}$

(a) An oxygen-16 ion with a mass of $2.66 \times 10^{-26} \mathrm{kg}$ travels at $5.00 \times 10^{6} \mathrm{m} / \mathrm{s}$ perpendicular to a 1.20-T magnetic field, which makes it move in a circular arc with a 0.231-m radius. What positive charge is on the ion? (b) What is the ratio of this charge to the charge of an electron? (c) Discuss why the ratio found in (b) should be an integer.

In which of the following diatomic molecules would the bond strength be expected to weaken as an electron is removed to form the positive charged ion?

a. $\mathrm{H}_2$

b. $\mathrm{B}_2$

c. $\mathrm{N}_2$

d. $\mathrm{OF}$

In an aqueous solution, which substance yields hydrogen ions as the only positive ion? (1) $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$, (2) $\mathrm{CH}_{3} \mathrm{COOH}$, (3) KH, (4) KOH.

Evaluate each express ion if x=6.

$$2 x \div 6$$

Give the formula of a negative ion that would have the same number of electrons as each of the following positive ions. $\mathrm{Rb}^{+}$

Suppose that we have $2.10 \times 10^\pi$ doubly charged positive ions per cubic centimeter, all moving north with a speed of $1.40 \times 10^5 \mathrm{~m} / \mathrm{s}$. (a) Calculate the current density, in magnitude and direction. (b) Can you calculate the total current in this ion beam? If not, what additional information is needed?

The component elements for four binary ionic compounds are shown with different colors on the indicated periodic table.

What is the likely chemical formula for the following?

a. Red compound

b. Blue compound

c. Yellow compound

d. Green compound

The component elements for four binary ionic compounds are shown with different colors on the indicated periodic table.

What is the likely chemical formula for the following?

a. Red compound

b. Blue compound

c. Yellow compound

d. Green compound

A toy manufacturer buys ball bearings from three different suppliers-50% of her total order comes from supplier 1, 30% from supplier 2, and the rest from supplier 3. Past experience has shown that the quality-control standards of the three suppliers are not all the same. Two percent of the ball bearings produced by supplier 1 are defective, while suppliers 2 and 3 produce defective bearings 3% and 4% of the time, respectively. What proportion of the ball bearings in the toy manufacturer’s inventory are defective?