Battle of the Brains - science

A clear marble made of a type of absorbent polymer (a type of plastic) is easily visible when held, but seems to disappear when placed in a glass of water.

Light with a frequency of 5.60 × 1014 Hz (Hertz) is used to test the behavior of light through the different substances. The velocity of light (v) is measured as the product of frequency (f) and wavelength (λ):

v=fλ

Figure 1 shows a polymer marble before and after it is dropped into a glass of distilled water. As indicated, the light changes velocity when it passes through each substance.

• 1. 3.57 × 10⁻⁷ m

• 1. 4.02 × 10⁻⁷ m

• 1. 5.35 × 10⁻⁷ m

• 7.12 × 10⁻⁷ m

Higher concentrations of atmospheric carbon dioxide have led to increased biomass of many species, while biomass of coral reefs has decreased across the Great Barrier Reef in the hydrosphere.

Based on the data, which statement best describes the relationship causing the decreased biomass of the coral reef species in the hydrosphere?

• 1. Ocean acidity is increasing because atmospheric carbon dioxide and absorption in the hydrosphere are increasing.

• 1. Atmospheric carbon dioxide and absorption in the hydrosphere are increasing because ocean acidity is increasing.

• 1. Ocean acidity is decreasing because atmospheric carbon dioxide and absorption in the hydrosphere are increasing.

• 1. Atmospheric carbon dioxide and absorption in the hydrosphere are decreasing because ocean acidity is increasing.

Tags

NGSS.HS-ESS2-6

NGSS.HS-LS2-6

NGSS.HS-LS4-5

Higher concentrations of atmospheric carbon dioxide have led to increased biomass of many species, while biomass of coral reefs has decreased across the Great Barrier Reef in the hydrosphere.

Identify the relationships between Figure 2, Figure 3, and Figure 4.

• 
• 
• 
• 

Tags

NGSS.HS-ESS2-6

NGSS.HS-ESS3-5

NGSS.HS-LS2-5

Rubidium and bromine, elements located on opposite sides of the periodic table, readily form a product when combined, as shown in the equation.

2Rb + Br2 → 2RbBr

4. Which piece of information found in Figure 1 is most useful in determining the number of outer electrons present in an atom?

• 1. group number

• 1. period number

• 1. type of element

• 1. metal or nonmetal

Tags

NGSS.HS-PS1-1

4. Based on its position on the periodic table, predict the charge that strontium (Sr) will take when forming a compound.

   Complete the sentence by choosing the correct answer.
   When strontium forms a compound, it will have a ​​
   ​ (a)   charge with a magnitude

   (number) of ​ ​ (b)   .​

• 1
• positive
• negative
• 2
• 3
• neutral

Which is the correct formula for strontium chloride, based on the placement of each element in the periodic table?

• SrCl

• Sr₂Cl

• SrCl₂

• Sr₂Cl₃

Tags

NGSS.MS-PS1-5