Chemistry Challenge Round 3

The sodium found in the human body typically has 11 protons, 12 neutrons and 10 electrons. What is the charge of the sodium ions found in the human body?

• -2

• 12

• +1

• 0

Mrs. Stamper has two identical glasses containing different volumes of water. When Mrs. Stamper taps the glasses, she finds that the glass with more water produces a lower pitched sound than the glass with less water. What is the dependent variable in this experiment?

• The amount of water in each glass

• The force used to tap each glass

• The size of the glasses

• The sound produced when each glass is tapped

To report temperature, most countries use degrees Celsius while the United States and only two other countries use degrees Fahrenheit. At what temperature are the values of the two scales equal?

• -40

• 10

• 50

• 0

Anhydrous ammonia is used in household cleaning products to break down grime. Based on the safety label shown below, why should this chemical be handled with care?

• It is easily ignited

• It explodes under heat

• It poses extreme danger to health

• It reacts with water

Tags

NGSS.MS-PS1-2

A doctor prescribes a tablet with 0.050 grams of aspirin to his patient to reduce blood clotting. To write the number as "50" on the prescription pad, what unit should he use?

• Milligram

• Picogram

• Gram

• Kilogram

In which group of the periodic table would an element be located if it is hard and dense, very reactive, and tends to give away two electrons?

• Group 1

• Group 17

• Group 2

• Group 18

• Alkali metals

• Halogens

• Alkaline earth metals

• Nobel Gases

Dew, a water droplet, forms on the grass during a cool spring night as a result of what process?

• Condensation

• Deposition

• Freezing

• Sublimation

Tags

NGSS.MS-ESS2-4

Nickel (element 28) is used in rechargeable nickel-cadmium batteries. In an atom of nickel, how many energy levels contain electrons?

• 4

• 5

• 10

• 14

Potassium is vital for plant growth. Which element has similar chemical properties to potassium?

• Ca

• Kr

• Na

• He