Chemistry Regent - June 2013 Q31-40

Which element is not present in the mixture?

• A
• D
• X
• Z

What is the overall charge of an ion that has 12 protons, 10 electrons, and 14 neutrons?

• 2-
• 2+
• 4-
• 4+

Tags

NGSS.HS-PS1-7

As the elements in Period 3 are considered in order of increasing atomic number, there is a general decrease in

• atomic mass
• atomic radius
• electronegativity
• first ionization energy

Tags

NGSS.HS-PS1-2

Which electron configuration represents the electrons of a sulfur atom in an excited state?

• 2-6-6
• 2-7-7
• 2- 8- 4
• 2-8-6

Tags

NGSS.HS-PS1-1

Given the word equation: sodium chlorate ? sodium chloride oxygen Which type of chemical reaction is represented by this equation?

• double replacement
• single replacement
• decomposition
• synthesis

Which compound has the highest percent composition by mass of strontium?

• SrCl₂
• SrI₂
• SrO
• SrS

Given the formula for hydrazine: How many pairs of electrons are shared between the two nitrogen atoms?

• 1
• 2
• 3
• 4

Which formulas represent one ionic compound and one molecular compound?

• N₂ and SO₂
• Cl₂ and H₂S
• BaCl₂ and N₂O₄
• NaOH and BaSO₄

Which Kelvin temperature is equal to 200. degrees C?

• -73K
• 73 K
• 200. K
• 473 K

A 10.0-gram sample of H₂O(l) at 23.0 degrees C absorbs 209 joules of heat. What is the final temperature of the H₂O(l) sample?

• 5.0 degrees C
• 18.0 degrees C
• 28.0 degrees C
• 50.0 degrees C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2