chemistry

One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?

• 15 percent

• 250g

• (NaCI)

• 1g

If you fill a glass to the brim with ice water and the ice melts, what will happen?

• The water level will drop slightly as the ice melts.

• The glass will overflow as the ice turns to water.

• The level of water in the glass will remain unchanged as the ice melts.

• All the water will evaporate.

The symbol Sb stands for stibnum or stibnite. What is the modern name of this element?

• Antimony

• Samarium

• Seaborgium

• Arsenic

Water-based liquids can be described as acidic, neutral, or basic, with respect to pH. Which of these describes milk?

• Milk does not have a pH

• Neutral

• Slightly acidic

• Strong acid

DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?

• Tubulin

• Albumin

• Keratin

• Collagen

Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?

• Krypton

• Chlorine

• Argon

• Helium

What is the most common isotope of hydrogen?

• Protium

• Deuterium

• Tritium

• Hydrogen only has one isotope!

You can't live without water! What is its chemical formula?

• H2

• H2O2

• H2O

• O2

Who is credited with the invention of the modern periodic table?

• Mendeleev

• Lavoisier

• Nobel

• Mendel

Which of these elements is a nonmetal?

• Manganese

• Aluminum

• Beryllium

• Sulfur