NMAT Chemistry Base

Correctly balancing a chemical equation is a demonstration of which law?

Which of the following is not an extensive property?

When barium chloride reacts with sodium sulfate, the products are table salt and barium sulfate. What type of reaction is this?

Given: P → PH₃ + H₂PO₂^– (alkaline) When balanced, what will be the sum of the coefficients of the products?

Which of the following does not represent any existing element?

A molecule is of the VSEPR type AX₃E₂, where A stands for the central atom, X for the attached atoms, and E for the lone elector pairs. The electron arrangement of the molecule and the shape of the molecule, respectively, are:

Which of the following is not a value of the universal gas constant R?

Which of the following is not a conjugate acid-base pair?

How does a buffer work?

2-propanol, when initially oxidized, will yield a/an

What continuous-chain alkane is isomeric with 2-methyl-3-ethylhexane?

What nuclear process occurred if emission of a particle by ²²⁶₈₉Ra results from the

Who was responsible for the development of the periodic table?

A PCl₅ molecule has what kind of hybrid orbitals?

Mary discover a new element X, which has three isotopes: ⁹³X, ⁹⁴X, and ⁹⁶ The average mass of X is exactly 94. If the relative abundance of ⁹³X is 10%, what is he relative abundance of her two isotopes?

In the combustion of ethyne in oxygen, 8g of O₂ was present. Ideally, what amount of ethyne could have reacted with all that O₂, and how much CO₂ could have been produced? (AW’s: H = 1 amu; c = 12 amu; O = 16 amu)

What kind of particle was emitted if and the result was ²⁵⁴₉₉Es ²⁵⁸₁₀₁Md underwent decay?

Fusion is most likely to occur with the

Arnel can prepare methanol from chloromethane by adding _____ to the latter

Jay can use the Molish test to determine the presence of ______ in an unknown sample. He expects a positive result of a ______

At 25 ^oC in the equilibrium N₂(g) + O₂(g) ↔ 2 NO K_p = 4.8 × 10^-31 which species will dominate

If the equilibrium constant K_c for F₂(×g) ↔ 2F(g) at a certain temperature is 7.3 × 10^-13, what is K_c for ½ F₂(g) ↔ F(g)?

Paul found a certain unknown compound to be 31.0% carbon, 5.2% hydrogen, 27.6% oxygen, and 36.2% nitrogen. The molecular weight was experimentally determined to be approximately 460. What is the empirical formula of the compound? (AW’s: H = 1, C = 12, N = 14; O = 16)

Paul found a certain unknown compound to be 31.0% carbon, 5.2% hydrogen, 27.6% oxygen, and 36.2% nitrogen. The molecular weight was experimentally determined to be approximately 460. Which is a possible molecular formula for the compound? (AW’s: H = 1, C = 12, N = 14; O = 16)

A sample of 0.025 M KOH stands at 25^o What is the pH of this sample? (10^0.4 ≈ 2.5; 10^0.6 ≈ 4)

A sample of 0.025 M KOH stands at 25^o What is the pOH of this sample? (10^0.4 ≈ 2.5; 10^0.6 ≈ 4)

Which of the following correctly shows the arrangement of the hydrohalides according to decreasing acid strength?

Which compound is the reducing agent?

Based on the given, which is the correctly written half-reaction that shows reduction?

How many H⁺ ions and H₂O molecule are involved overall?

On the planet called Dublyrxon, unusual elements are found. However, these elements generally still follow chemical and physical laws as those found on Earth. Some elements found there, along with their atomic masses, are the following:

• Nicoliqon (Nc) – 21 amu
• Kyxorzen (Ky) – 25 amu
• Byrntunheill (Brn) – 3 amu

The compound NcBrn₃ decomposes via the following reaction: 2NcBrn₃ → Nc₂ + 3Brn₂. It decomposes at a constant rate until it has all disappeared. What is the order of reaction with respect to NcBrn₃?

On the planet called Dublyrxon, unusual elements are found. However, these elements generally still follow chemical and physical laws as those found on Earth. Some elements found there, along with their atomic masses, are the following:

• Nicoliqon (Nc) – 21 amu
• Kyxorzen (Ky) – 25 amu
• Byrntunheill (Brn) – 3 amu

4NcKy₂ + Ky₂ → 2Nc₂Ky₅. For the given reaction, [Ky₂] was held constant. The reaction rate quadrupled when [NcKy₂] was doubled. What is the order of reaction with respect to NcKy₂?

On the planet called Dublyrxon, unusual elements are found. However, these elements generally still follow chemical and physical laws as those found on Earth. Some elements found there, along with their atomic masses, are the following:

• Nicoliqon (Nc) – 21 amu
• Kyxorzen (Ky) – 25 amu
• Byrntunheill (Brn) – 3 amu

The decay of Brn₂ follows a first order reaction with a rate constant of 5.0 × 10^-8 /h. What is its half-life? (ln 2 ≈ 0.693)

On the planet called Dublyrxon, unusual elements are found. However, these elements generally still follow chemical and physical laws as those found on Earth. Some elements found there, along with their atomic masses, are the following:

• Nicoliqon (Nc) – 21 amu
• Kyxorzen (Ky) – 25 amu
• Byrntunheill (Brn) – 3 amu

Nc₂ is a gas whose density is 73.5 g/L. what pressure will it exert at a temperature of 27^oC?

Given the following reaction

HI (g) → ½ H₂ (g) + ½ I₂ (s) ( ∆H_r^o = – 26.48 kJ/mol; ∆S_r^o = – 83.18 J/ Kmol)

What is the standard free energy of decomposition of HI (g) at 25 ^oC?

Given the following reaction

HI (g) → ½ H₂ (g) + ½ I₂ (s) ( ∆H_r^o = – 26.48 kJ/mol; ∆S_r^o = – 83.18 J/ Kmol)

Will the reverse of this reaction be spontaneous?