Identify a Brønsted-Lowry conjugate acid-base pair in the reaction.

CH3CH2COOH(aq) + H2O(l) ---> CH3CH2COO−(aq) + H3O+(aq) The key to idenitifying Bronsted-Lowry acid-base pair and realizing that acid and base must differ in only one Hydrogen. According to the theory, Bronsted-Lowry acid is a proton (H+) donor, and Bronsted-Lowry base is a proton (H+) acceptor. When looking at the equation we must first look at reactants and then at products. In the equation given above, we see that CH3CH2COOH(aq) on the reactant side turned into CH3CH2COO−(aq) on the product side, therefore looking an H+. Thus, we conclude that CH3CH2COOH(aq) is the acid and CH3CH2COO−(aq) is its conjugate base. We can also spot another conjugate pair. H2O is turned into H3O+ on the produc

When a chemical reaction is at equilibrium, the concentration of each reactant and the  concentratio

When a chemical reaction is at equilibrium, the concentration of each reactant and the concentration of each product must be (1) constant (2) variable (3) equal (4) zero Answer and Explanation: Most chemical reactions do not go to completion, but rather reach equilibrium. This is a state in which the rate of the forward reaction is equal to the rate of the reverse reaction. As reactants are making products, products are making reactants back at the same rate. If we were in a lab looking at the reaction at equilibrium, we would have a hard time noticing that it's at equilibrium since we would not see any noticeable changes. This is because the concentrations of reactants and products remain

n Long Island, several businesses use geothermal technology. This involves taking heat from within E

n Long Island, several businesses use geothermal technology. This involves taking heat from within Earth and using it to heat buildings. One benefit of this technology is that it (1) contributes to global warming (2) reduces the ozone shield (3) reduces dependence on fossil fuels (4) decreases resources for many species Answer and Explanation: The question asks for one benefit of the use of geothermal technology. Let's first look at each answer choice and deduce wether it would be a benefit or a disadvantage. Choice one talks about the contribution to global warming. Global warming is a very alarming phenomenon affecting Earth every day negatively. Choice two discusses reduction of ozone s

Which molecules are needed to cut and copy segments of DNA?

Which molecules are needed to cut and copy segments of DNA? (1) reproductive hormones (2) carbohydrates (3) antibodies (4) biological catalysts Answer and Explanation: All of the answer choices are molecules in our body. Let's look at the definition of each choice one at a time. Reproductive hormones such as testosterone and estrogen function to regulate reproductive functions such as menstrual cycle, sperm production etc. Carbohydrates are molecules from which our bodies derive energy in the form of ATP. Antibodies protect our bodies from the invasion of foreign particles (pathogens) Biological catalysts, or enzymes help our body speed up and perform all of the reactions that need to be d

What is the number of electrons shared in the multiple carbon-carbon bond in one molecule of 1-penty

What is the number of electrons shared in the multiple carbon-carbon bond in one molecule of 1-pentyne? (1) 6 (2) 2 (3) 3 (4) 8 Answer and Explanation: Pentyne is an organic compound. We know from looking at the ending "yne" that this molecules belongs to the class of alkynes if we look at the Reference table. Alkynes are molecules that have a triple bond. Since the question asks us for the number of electrons shared in multiple carbon-carbon bond, triple bond is what we must be looking at. A single bond shares two electrons, and thus, a triple bond must share three times as much or 6 electrons. Therefore, answer choice (1)6 is the correct answer. To schedule a session with the best chemistr

A sample of water is boiling as heat is added at a constant rate. Which statement describes the pote

A sample of water is boiling as heat is added at a constant rate. Which statement describes the potential energy and the average kinetic energy of the water molecules in this sample? (1) The potential energy decreases and the average kinetic energy remains the same. (2) The potential energy decreases and the average kinetic energy increases. (3) The potential energy increases and the average kinetic energy remains the same. (4) The potential energy increases and the average kinetic energy increases. Answer and Explanation: During boiling, molecules must gain enough energy to separate from one another (overcome intermolecular forces holding them together) and enter the gas phase. During pha s

Which type of reaction involves the transfer of electrons?

Which type of reaction involves the transfer of electrons? (1) alpha decay (2) double replacement (3) neutralization (4) oxidation-reduction Answer and Explanation: Alpha decay is a type of nuclear reaction where the nucleus of parent atom breaks down and releases alpha particle( Helium atom) as well as a new atom. In a double replacement reaction, two ionic compounds come together and switch their partners. Thus, they create two new ionic compounds. In a neutralization reaction, an acid and base react together, or neutralize each other to create water and salt. Finally, in oxidation-reduction reaction a transfer of electrons occurs. One element get oxidized (looses electrons, and another

An ocean on early Venus?

The new study, published online July 18 in the Journal of Geophysical Research: Planets, provides a new clue to whether Venus could have ever supported life. According to the new simulations, Venus had just the right amount of cloud cover, carbon dioxide and water to start with, and could have formed an ocean. This finding could help researchers find other habitable planets outside of solar system. In the simulation, planetary scientist Emmanuel Marq of the Université de Versailles Saint-Quentin-en-Yvelines in Guyancourt, France, and colleagues calculated how the cooling of a young rocky planet’s molten surface would interact with its developing atmosphere and incoming heat from the young su

Which formula represents an alkane?

Which formula represents an alkane? (1) C2H2 (2) C2H4 (3) C3H4 (4) C3H8 Answer and Explanation: The general formula for an alkane is CnH2n+2. Therefore all we need to do is plus the carbon subscript and find out how many hydrogens are needed to make the formula an alkane. Let's start with choice 1: C2H2, If we plug in 2 for n, we see H must be 2*2+2=6. 2: C2H4, the number of Hydrogens is still not 6 and is therefore not a correct answer choice. 3. C3H4, if we plug in 2 for n, we see that H must be 2*3+2 = 8 4. C3H8, the number of Hydrogens is 8 which is the correct answer. To learn more about our amazing chemistry tutors in NYC and online, click here #regentschemistry

A molecule must be nonpolar if the molecule

A molecule must be nonpolar if the molecule (1) is linear (2) is neutral (3) has ionic and covalent bonding (4) has a symmetrical charge distribution Answer and Explanation: A molecule is considered to be non polar when the charge is symmetrically distributed in it or when there is an equal sharing of electrons between the two atoms of a diatomic molecule . Examples of non polar molecules are : O2, CH4, CCl4. In these molecules, central atom is surrounded by the same elements like Carbon with four hydrogens. Oftentimes, non polar molecules have polar bonds like CH4. Answer (4) has a symmetrical charge distribution is the correct answer choice. To learn more about our amazing chemistry tu