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Sample Chemistry Placement Exam Questions 2024 Solved Correctly To Score A+
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Sample Chemistry Placement Exam Questions 2024 Solved Correctly To Score A+
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Sample Chemistry Placement Exam Questions 2024 Solved Correctly To Score A+Answer: Oxygen
Aluminum forms a +3 ion. In order for the formula unit Al ₂X₃ to be electrically neutral,
the element X must form a -2 ion. Nonmetals in the oxygen column do this. Of these elements, only oxygen is a diatomic gas. Answer- Aluminum reacts with element X to form a compound with the formula A ₂X₃. Element X exists as diatomic molecules, X₂, in the gaseous state at normal temperature and pressure. Element
X must be?
Answer: 5
The balanced equation is 2 C ₂H₄O + 5 O₂ → 4 CO₂ + 4 H₂O Answer- What is the coefficient of O₂ when the following equation is balanced?
C₂H₄O + O₂ → CO₂ + H₂O
Answer: 2.00
8.00 mol GeF₃H ( 1 mol GeH₄/ 4 mol GeF₃H) = 2.00 mol GeH ₄ Answer- How many moles of GeH₄ are needed to form 8.00 moles of GeF ₃H according to the following reaction?
GeH₄ + GeF₄ → 4 GeF₃H
Answer: A nonmetal
Nonmetals are toward the upper right of the periodic table. All the elements in the fluorine column are nonmetals. Answer- According to its location in the periodic table, the element bromine (element # 35) is best described as
Answer: NaCl
HCl, hydrochloric acid, is a strong acid. NH ₃, ammonia, is a weak base. In a solution of NaHCO₃, sodium hydrogen carbonate (baking soda), the hydrogen carbonate ion,
HCO₃- , acts as a base. Neither the sodium ion Na+, nor the chloride ion, Cl - , which
form when NaCl is dissolved in water, has significant acidic or basic properties. Answer- Which of the following species is neither acidic nor basic when dissolved in water
Answer: 8.3 x 10 ⁸ The "calculator answer" is 8.2695.... x 10 . When the numbers in the numerator are ⁸
subtracted the result, 8.53, must be rounded to one decimal place, or 8.5. Since this number has two significant figures, the result when it is divided by a number with 5 significant figures is limited to two significant figures. Answer- To the correct number
of significant figures, the result of the following calculation
[(11.13 - 2.6) x 10 ]/[103.15 x 10− ] ⁴ ⁶
should be reported as
Answer: 14 Answer- How many total atoms are in the formula
Al₂(CO₃)₃?
Answer: 36 Answer- How many electrons are in Br-?
Answer: 2, 3, 6, 1 Answer- What are the coefficients for the following
reaction when it is properly balanced?
Na₃PO₄ + Ba(NO₃)₂ → NaNO₃ + Ba₃(PO₄)₂
A) 3.00 mol Answer- Given that 4 NH ₃ + 5 O₂→ 4 NO + 6 H₂O,
when 4.50 mol of H ₂O are formed, the amount
of NO formed is
A) 3.00 mol B) 6.75 mol
C) 1.50 mol D) 4.50 mol
acid-base neutralization Answer- What type of a reaction occurs when a sodium
hydroxide solution is mixed with an acetic
acid solution?
Answer: A) Ne Answer- Which of the following atoms has the smallest
radius?
A) Ne B) O
C) Li D) B
Answer: Bent Answer- What is the molecular geometry if you have a
double bond, a single bond and 1 lone pair
around the central atom?
D) 21.9 mL Answer- What volume of 12.0 M HCl is required to
make 75.0 mL of 3.50 M HCl?
A) 0.560 mL B) 257 mL
C) 560. mL D) 21.9 mL
D) 1.12 × 10² Answer- (2.80x10-³) (1.28 x 10¹)/(3.20 x 10- )= ⁴
A) 1.27 × 10¹ B) 2.0 × 10²
C) 1.2 × 10 D) 1.12 × 10² ⁶
Answer: D) AsH₃ Answer- Of the molecules below, only __________ is
polar.
A) CH₄ B) SbF₅
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