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He is known for discovering the Law of Conservation of Energy
Pure Energy, Gary Valenciano, loves to do useful work such as dancing. Although, pure energy essentially does not exist. This type of energy has been hypothesized by scientist may be the purest form of energy.
MERALCO turned on the lights. Light is energy that has no mass, is this considered as a pure energy?
As Thomas Edison grew older, he became completely deaf in one ear and partially deaf in the other. Despite the handicap, he became a great scientist and he even designed a battery under his name. This battery is:
The property of metals that allows them to be drawn into thin wires beyond their elastic limit without being ruptured is called
What is the generic name of a class of polymer which is commercial known as nylon?
Galvanized steel are steel products coated with
What is the effect of silicon in cast iron?
Robyn Rihanna Fent is gonna let the rain pour she’ll be all we need and more. The pH of normal rainwater is _____
The Taj Mahal is a nice place, however, due to the ignorance of human life it is being degraded mainly due to ____ affecting the marble content
Calculate the concentration of Ca2+, Mg2+, and CO32- if dolomite is dissolved in water that contains 100 mg/L CO32-? The solubility product of dolomite is 10-17.09.
How much BaCl2H2O must be dissolved to prepare 2L of 0.108M of BaCl2?
What is the concentration of K+ ions in a solution of 63.3ppm of K3Fe(CN)6?
What volume of 0.1025M HCl must be added to 15.64mL of 0.0956 M NH3 to produce solution of pH = 9.00?
What mass (g) of dipotassium phthalate must be added to 750 mL of 0.0500 M phthalic acid to give a buffer of pH 5.75?
Korean soju is modernly made by fermenting potatoes. If this alcohol is oxidized with K2Cr2O7 what would be the product?
The halogenation of isobutane would yield what major product?
What are the products of acetic acid and ethanol undergoing esterification
The reaction showcases the conversion of arylamines to aryl fluorides. The reaction happens through diazotization after which thermal decomposition of the derived hexafluorophosphate or tetrafluoroborates.
Which among the following Lewis acids is not a Bronsted acid
What is the IUPAC name for CH3CH2C(CH3)2CH2CH(CH3)2?
The alkane CH3CH2C(CH3)2CH2CH(CH3)2has how many 1º, 2º. 3º & 4º carbon atoms?
How many electrons occupy the bonding molecular orbitals of a CN triple bond?
Which of the following molecules will not have a dipole moment?
Which of the following reagents and conditions would best serve to convert 1-butyne to 1,1-dibromobutane?
Zirconium has an HCP crystal structure and a density of 6.51 g/cm3. What is the volume of its unit cell in cubic meters?
Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. Determine the density in g/cm3.
If the atomic radius of aluminum is 0.143 nm, calculate the volume of its unit cell in cubic meters
Some hypothetical metal has the simple cubic crystal structure. If its atomic weight is 70.4 g/mol and the atomic radius is 0.126 nm, compute its density in g/cm3.
Rhenium has an HCP crystal structure, an atomic radius of 0.137 nm, and a c/a ratio of 1.615. Compute the volume of the unit cell for Re.
Which persistent organic pollutant included in the initial list of the 12 POPs under the Stockholm convention is not considered as a pesticide?
A trace metal which causes disintegration of the bones or more commonly called Itai-itai disease.
Arrange the following in terms of increasing toxicity:
1: heptachlor, 2: dieldrin, 3: DDT, 4: As, 5: Cr
Which of the following has the highest MCL?
Compute for the ThOD of 200 mg/L of glucose.
Developed in the 1920s for studies of pollution in Ohio river.
Limiting the increase in the global average temperature to well below 2 degC by the end of this century.
Phenomenon when the contaminant is transported with the bulk flow, that is, moving groundwater.
Clean Water Act was approved by which president.
Reaction product of VOC and nitrogen oxides.
Find the pH of a 0.0025 M HCl solution. Express the answer to the correct number of significant figures.
Refers to the component of interest in a sample solution.
Determine the volume in millilitres of one mole of pure ethyl alcohol.
What weight of magnesite should be taken for analysis in order that, after converting all the Fe to a precipitate of Fe2O3*xH2O, the percentage of Fe3O4 in the sample can be found by multiplying the weight of the ignited precipitate in grams by 100?
Most metals are analyzed using EDTA in a _________ solution.
All of the following are characteristics of ideal gases except
A mixture of 0.660 grams of camphor and 0.050 gram of an organic solute freezes at 157oC. If the solute contains 10.5% H by weight, determine the molecular formula of the solute if the freezing point of camphor is 178.4oC and the value of Kf is 38.
The vapor pressure of all liquids
When evacuated or empty a gas density bulb weighs 29.3215 grams. First, CO2 gas was used to fill the bulb at 40 deg C and 1.0 atm P and it weighed 30.0079g. The bulb was then evacuated and filled with a mixture of CO and CO2 under the same temperature and pressure. With this mixture the bulb weighed 29.9332. Determine the % of CO in the mixture.
A chemical process may mean any of the following: removal of oxygen, decrease in valence and addition of hydrogen is called
If ethanol and methanol are mixed 50/50 by weight at 60oC, and the solution assumed ideal, the composition of the vapor above the solution is
As the atmospheric pressure decreases, the boiling point of a liquid
Color, crystalline form of stibnite.
Cerargyrite is a mineral form of ________.
Which of the following timber has the highest average density?
Which of the following minerals has the highest specific gravity?
Which of the following insulating materials has the lowest thermal conductivity at 100 degF?
In a single replacement reaction, why will one metal replace another metal in an ionic compound?
The pressure of a gas will (1) when the volume is decreased and will (2) when the absolute temperature is decreased
A patented solvent named Vincenzene has the properties of latent heat of vaporization of 230 cal/g, latent heat of fusion of 99 cal/g with a freezing point of 80C, and boiling point of 3330 What is the melting point of 23% wt urea in Vincenzene?
How many valence electrons does an oxygen atom have?
You are trying to synthesize MgBr2 and Ca(NO3)2 for your thesis. The chemical reactions you are using are (1) HBr + Mg(OH)2 → MgBr2 and (2) LiNO3 + CaBr2 → Ca(NO3)2. What is the sum of all stoichiometric coefficients of both reactions, including the byproducts?
Which of the following is not a naturally occurring nuclear fuel?
Zeke Jaeger has alcohol content in his spinal fluid. He wants to replicate this alcohol content by fermentation. What is the sum of the stoichiometric coefficients of the standard alcoholic fermentation?
When propane is completely combusted, the number of moles of oxygen in the balanced equation is?
Riley Bina wants to have a polished mirror finish to her steel ponytail. She consulted you as her trusted, talented, and inspiring chemical engineer, and you told her it could be achieved by chromium plating. What is the set of quantum numbers for the 19th electron of chromium?
He was awarded the 1934 Nobel Prize in Chemistry because of his discovery of deuterium, but refused to travel to Sweden because his wife was pregnant, so he delivered his Nobel Lecture the following year.
What is the most abundant organic compound on our beautiful planet?
Allotropes are defined as different structural forms of a single chemical element. Which of the following is not an allotrope of carbon?
Cardo Dalisay admires the polarities of organic compounds as his new hobby. He has bottles of alcohol, carboxylic acid, and amine. He tasked you to arrange it by increasing polarity. How would you arrange it?
Your close friend, Jang Han Seok, loves the number six, and he collects isomers of hexane for his collection besides wristwatches. He put his samples inside the freezer. Which of his samples would freeze last? Samples: hexane, 2-methylpentane, 3-methylpentane, and 2,3-dimethylbutane
Which of the following is not an aromatic compound?
A genie is willing to grant you any wish if you can pick which of his carbon functional group would boil second to the last. Choices: Alcohol, ester, ether, and carboxylic acid. What would you choose to get a wish come true?
You decided to create a fandom for your favorite scientist. He established the law of constant proportions, proposed the concept of allotropy, discovered cerium and selenium, and the vital force theory (to name a few). Who is this hyperactive man in science that you stan?
When Mikasa drinks alcohol, she experiences an Asian flush that makes her face red even without Eren. This is because she lacks what particular enzyme?
Despite common notions, many Lewis acids are not Brønsted Lowry acids. Which of the following is both a Lewis acid and a Brønsted Lowry acid?
Vincenzo loves to drink a glass of wine every now and then. He dropped his glass on a pale of acid. Apparently, this acid is so strong, like him, that it ate the glass. What is this acid?
A mixture of the 8-hydroxyquinoline complexes of Al and Mg weighed 1.084 3 g. When ignited in a furnace open to the air, the mixture decomposed, leaving a residue of Al2O3 and MgO weighing 0.1344 g. Find the weight percent of Al(C9H6NO)3 in the original mixture.
When formic acid is 4.6% ionized in 0.105 M of aqueous solution at room temperature, determine the ionization constant of the acid. If the solution containing 0.25 N of 25 mL acid is diluted to 202 mL and titrated with 0.35 M NaOH, calculate the pH value and the concentration of the hydrogen ion at the equivalence point.
Calculate the percentage of nickel in a 1.201-g sample of nickel ore which was analyzed by the volumetric method. First, the sample required 48 mL of 1.4 × 10-2 g/mL KCN solution then the excess cyanide required 0.5 mL of 1.25 × 10-2 g/mL AgNO3 solution.
Determine the electrochemical cell potential of the following cell and determine if the reaction is spontaneous or not: Ag(s) | Ag+ (0.075 M) || Hg2+ (0.85 M) | Hg(l), E° = 0.054
A 0.5-g sample containing MnO2 is treated with HCl, liberating Cl2. The Cl2 is passed into a solution of KI and 30 mL of 0.1 M Na2S2O3 are required to titrate the liberated iodine. Calculate the percentage of MnO2 in the sample
As a lead storage battery is discharged
Crystalline substances are ________. Amorphous substances are ________.
Raman spectra may be obtained in
Consider the decomposition reaction: PCl5(g) D PCl3(g) + Cl2(g). Which of the following changes will increase the concentration of Cl2(g)?
In a metallic solid, ___________ are located at the lattice points.
If the heat of vaporization of water is taken as 44.014 kJ/mol, calculate the pressure at which water boil at 80ºC.
Nitrogen gas escapes through a pinhole in 68.4 seconds. Under the same conditions, a gaseous compound with the empirical formula CH2 escapes in 83.8 seconds. What is the molecular formula?
The viscosity of a gas _____________ as the temperature increases.
Subtracting the vapor pressure of water from the total pressure of a gas collected over water is an example
When an iron wire is immersed in an acidic solution of CuSo4, the blue color of the solution is lost after some time. This is due to
The following reaction does not occur spontaneously (all ions at 1m concentration; all gases at 1 atmosphere pressure)
At 27ºC, 500 mL of H2 measured under a pressure of 400 mm Hg and 1000 mL of N2 measured under a pressure of 600 mm Hg are introduced into an evacuated 2-L flask. Calculate the resulting pressure.
When a liquid is in dynamic equilibrium with its vapor at a given temperature, the following conditions could exist:
I. There is no transfer of molecules between liquid and vapor
II. The vapor pressure has a unique value
III. The opposing processes, (liquid to vapor) and (vapor to liquid), proceed at equal rates
IV. The concentration of vapor is dependent on time
Which of the above choices are applicable?
Dissolving a solute such as KOH in a solvent such as water results in
When a cell of a lead storage battery is being charged, it is
A laboratory worker has requested your advice on a shield for a work she is doing with high energy beta particles. What would you recommend?
At what part of the atmosphere is the ozone layer found?