Explanation

Significant figures (also known as significant digits) are the number of digits in a measurement or calculation that are known to be reliable and accurate, including the first doubtful digit.

For example, the measurement "23.4 cm" has four significant figures, while "23.40 cm" has five significant figures.

Explanation

To find the area of the chip wrapper, you multiply the length by the width:

Area = Length x Width

= 4.5 cm x 5.9 cm

= 26.55 cm^2

So, the area of the chip wrapper is 26.55 cm^2.

Explanation

Silver nitrate (AgNO3) is a strong oxidizing agent and a caustic substance.

It is also known as "lunar caustic" due to its historical use to treat lunar burns (sunburn).

Explanation

Chlorine (Cl) is a strong oxidizing agent.

It means it can accept electrons from other substances and cause them to be oxidized.

Explanation

Selenium (Se) is a metalloid, which means it exhibits some properties of metals and some properties of nonmetals.

Metalloids are elements that are intermediate in character between metals and nonmetals.

Explanation

Group VIII-A, also known as the noble gases, consists of:

• Helium (He)
• Neon (Ne)
• Argon (Ar)
• Krypton (Kr)
• Xenon (Xe)
• Radon (Rn)

Explanation

Bromine (Br2) is the only halogen that exists in a liquid state at room temperature.

It is a reddish-brown liquid with a melting point of -7.2°C or 19°F.

Explanation

Hydroiodic acid (HI) is the strongest acid.

The acidity of hydrohalic acids increases down the group in the periodic table.

Due to the decreasing bond strength and increasing bond length.

Explanation

Chlorine can be displaced by fluorine (F).

This is because fluorine is more reactive than chlorine.

As halogen reactivity decreases down the group in the periodic table.

Explanation

Ba is the chemical symbol for Barium, a chemical element with atomic number 56.

It is a soft, silvery-white alkaline earth metal.