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D)
Which statement is true about an alpha particle?
A) It contains electrons B) It has a negative charge C) It is a type of electromagnetic radiation D) It has the same structure as a helium-4 nucleus |
B)
using only relative position in the periodic table, predict which combination of elements would have the greatest electronegativity?
A) As, Br B) Rb, Cl C) Ca, As D) O, Se |
A)
which of the following substances has covalent bonds that are most polar?
A) H2O B) H2S C) NH3 D) CH4 |
A) 2HgO > 2Hg+ 02
B) 4Na + O2 > 2Na2O C) 2NH3 > N2 + 3H2
predict the products of these synthesis and decomposition reactions, fully balanced.
A) HgO > B) Na + 02 > C) NH3 > |
D)
how many atoms are present in 2.00 mols of nitrogen gas, N2?
A) 3.01 x 10^23 atoms B) 6.02 x 10^23 atoms C) 1.20 x 10^24 atoms D) 2.40 x 10^24 atoms |
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each of two or more forms of the same element, that contain equal number of protons but different number of neutrons in their nuclei, hence differ in atomic mass.
what is an isotope?
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A) Magnesium Oxide
B) Aluminum Oxide
Draw lewis symbols to illustrate the formation of the following ionic compounds.
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D)
Which of the following substances will most likely have the highest boiling point?
A) Butane, C4H10 B) Pentane, C5H12 C) Hexane, C6H14 D) Heptane, C7H16 |
C)
which shows the general equation for a neutralization reaction that involves a hydroxide compound?
A) acid+ionic comound > water +base B) Water + ionic compound> acid + base C) acid + base> water + ionic compound D) Water + base> acid + ionic compound |
C)
what type of formula is CO2, molecular or empirical?
A) molecular only B) empirical only C) both molecular and empirical D) none of the above |
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A) Silicon
B) Krypton C) Chlorine
draw lewis diagrams for the following elements.
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A) Br2
B)OF2 C)PO3(-3)
draw a lewis structure and structural formula for the following molecules or ions.
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C)
which of the following forces is a non-renewable resource?
A) corn crops B) solar energy C) fossil fuels D) rainwater |
B)
carbon monoxide gas acts as a poison by
A) binding to substances in red blood cells B) rupturing lung cells C) paralyzing muscles D) creating acid in the bloodstream |
150 g
how many grams of iron are in 2.7 mol of iron?
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C)
Which is a molecular element?
A) Helium B) Beryllium C) Oxygen D) Neon |
A) polar covalent
B) ionic C) ionic
predict whether the bond between the pair of elements will be non-polar covalent, polar covalent, ionic.
A) N and H B) Al and F C) Br and K |
A) NAClO3(s) > NaCl(s)+ O2(g)
B) C2H2(g) + O2(g) > H2O(g)+ CO2(g)
Balance the following equations.
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C)
Which metal is least likely to displace hydrogen from acids?
A) potassium B) Magnesium C) Gold D) Aluminum |
4.1x10^23 atoms silicon atoms
how many atoms are in 0.68 mol of silicon?
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B)
How does electronegativity vary in the periodic table?
A) It increases from top to bottom and from left to right. B) it decreases from top to bottom but increases from left to right. C) it increases from top to bottom but decreases from left to right. D) it decreases from top to bottom and left to right. |
A) CS2
B) As2O3 C) Ab2O5
write the chemical formula for the following molecular compounds.
A) Carbon disulfide B) diarsenic trioxide C) diantimony pentaoxide |
D)
what type of reaction is represented by the equation below?
2KClO3(s)> 2KCl(s) + 3O2 (g) A) SD B) DD C) Neutralization D) Decomposition |
C)
which type of reaction involves an acid and a base producing water and an ionic compound?
A) Combustion B) Acidification C) neutralization D) Decomposition |
B)
phosphorus burns in oxygen
P4(s)+5O2(g) > 2P2O5(s) if 4 mol of phosphorus is available to react with 25 mol of 02, how many moles of the excess reactant will remain? A) 1 mol B) 5 mol C) 12.0 mol D) 15.0 mol |
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