Find the density of the piece of lead that has a mass of 49.01 g and a volume of $4.5 \mathrm{cm}^{3}$.

Write an abbreviated electron configuration for an atom of each of the following: a. titanium
b. strontium
c. barium
d. lead

Copy and complete the table by supplying the missing information.

$$\begin{matrix}\text{Density}\\\text{Sample} & \text{Mass} & \text{Volume} & \text{Density}\\\text{A} & \text{3.0 g} & \mathrm{6.5 cm^{3}}\\\text{B} & \text{1.2 g} & \mathrm{1.1 cm^{3}}\\\text{C} & \text{4.5 g} & & \mathrm{0.88 g/cm^{3}}\\\text{D} & \text{125 g} & & \mathrm{0.36 g/cm^{3}}\\\text{E} & & \mathrm{85 cm^{3}} & \mathrm{2.3 g/cm^{3}}\\\text{F} & & \mathrm{10 cm^{3}} & \mathrm{0.75 g/cm^{3}}\\\end{matrix}$$

What were the major scientific advancements of the 19th century? How did these advancements lead to larger changes?

Which element has the highest melting point in kelvins?

a) lead b) copper c) gold d) uranium

Explain which contains more atoms: $1 \mathrm{~kg}$ of lead or $1 \mathrm{~kg}$ of aluminum.

Three equally thick layers of aluminum, copper, and lead are used to reduce the intensity of an x-ray beam to one-third of its original intensity. The wavelength of the beam is 50 pm. (a) Find the thickness of a layer of material. (b) By what fraction would the initial beam intensity be reduced by the lead alone?

Indicate whether the statement below is true or false according to the passage.

Procrastination may lead to health problems,

A pot is partially filled with water, in which a plastic cup is floating. Inside the floating cup is a small block of lead. When the lead block is removed from the cup and placed into the water it sinks to the bottom. When this happens, does the water level in the pot (a) rise, (b) fall, or (c) remain the same?

Lead (II) nitrate is a poisonous substance which has been used in the manufacture of special explosives and as a sensitizer in photography. Calculate the mass of lead in 139 g of Pb(NO$_3$)$_2$.

a) 107 g
b) 90.8 g
c) 87.0 g
d) 83.4 g
e) 62.6 g

Insert a question mark if the sentence is interrogative, or an exclamation point if the sentence is exclamatory.
Erik just took the lead

What is a double-displacement reaction? Describe the double-displacement reaction shown in the following chemical equation in which lead nitrate, $Pb(NO_3)_2,$ and potassium iodide, KI, react to form lead iodide, $PbI_2,$ and potassium nitrate, $KNO_3.$ $Pb(NO_3)_2 + 2KI \rightarrow PbI_2 + 2KNO_3$

A 40-g ice cube floats in 200 g of water in a 100-g copper cup; all are at a temperature of 0$^ { \circ } \mathrm { C }$. A piece of lead at 98$^ { \circ } \mathrm { C }$ is dropped into the cup, and the final equilibrium temperature is 12$^ { \circ } \mathrm { C }$. What is the mass of the lead?

It is claimed that if a lead bullet goes fast enough, it can melt completely when it comes to a halt suddenly, and all its kinetic energy is converted into heat via friction. Find the minimum speed of a lead bullet

$$(\text {initial temperature} = 30.0^\circ C)$$

for such an event to happen.