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Which of the following statements are true?

Chemistry help?

The area of Sarah's garden is given by A = 3(4 - x^2). Find the maximum area of her garden.?

What is the molecular formula of a hydrocarbon with molar mass 98 g mol^-1?

why does energy change when expressed as per mole of reactant?

The diagram represents three vessels that contain the same amount of Argon gas, but with different temperatures and volumes.?

three beakers, three different bases, all same concentration. Beaker A pH of 10.4, Beaker B has a pH of 13.7, and Beaker C has a pH of 8.1.?

A highly concentrated ammonia solution is found to have a pH of 12.08. What is the hydroxide concentration, [OH-(aq)] in mol L-1?

2 H2(g) + S2(g) ---equilibrium reaction arrow --- 2 H2S(g) At a certain temperature, Kc = 1.30 ✕ 1010 for the reaction above.?

Which of the following would NOT increase the rate of reaction:?

Write and balance the chemical reaction. Express your answer as a chemical equation. Identify all of the phases in your answer.?

a gas has a volume of 6460 mL at 870 mm Hg and 77.2 C what is the volume of the gas at STP?

At STP a gas occupies 720cm³, calculate the temperature at which the gas occupies 1000cm³ and with a pressure of 698mm/Hg?

can someone help me to find the sector of a circle ?

How do you balance REDOX reactions using the Oxidation Number method not the half reaction method step by step in the question below?

Compound containing C & H is combusted. From a 20.0 gram of compound 67.5 g of CO2 & 13.8 g of H2O are obtained. What is empirical formula?

Chemistry Acid-Base pH Question?

The half-life of polonium-210 is 138.4 days.?

the periodic table is organized so that atoms of elements with the same number of valence electrons are in?

Chemistry post lab question :(?

If the roots of the cubic equation x^3-2x^2+kx-27=0 are in geometric progression, determine the value of k?

What is that OH- of a solution with (H3O+) = 9.3x10^-2 M?

calculate the molarity of a solution made by dissolving 346g ofcopper 2 chloride in 2500ml of water?

How do I find the amount of salt produced from 10.0 g of MgCl2 reacting with H2SO4? The balanced equation is MgCl2+H2SO4-->MgSO4+2HCl?

How many grams of KOH are needed to make 350 mL of 2.0 M solution?

ICE Table question??

Chemistry help!!! Not sure how to go about solving this...?

chemistry (pls show all ur step obtaining)?

Electrolysis calculations?

Need help with this chemistry problem?

Need Help solving this chemistry problem?

Name the following anions 1. O 2. N^-13 3. Br^-1?

A three person comitee is chosen at random from a group of 8 women and 3 men. Find probability that the committee contains at least one man?

Is this true "electrons flow from the positive terminal to the negative terminal inside the battery by chemical action"?

Following question on ketones?

Can someone help me? Need to find the area (Integration/Calculus)?

How many electrons are in 1 mol of hydrogen gas?

Questions regarding Calculus Differentiation?

What volume will 4.2 moles of neon has occupy at 27 degrees Celsius and a pressure of 47.2 kPa?

CHEM LAB HELP: hardness of water, Urgent!?

The molar solubility of calcium chromate in a 0.170 M calcium acetate solution is M.?

Calculate the critical angle for an air-water boundary. the inex of refraction of water is 1.33?

What is the pH of a solution prepared by mixing 10 mL of 0.10M NH3 and 5 mL of 0.24M NH4+? Ka for NH4 = 5.56x10^-10?

When 45 mL of 1.3 M sr(no3)2 mixes with excess alcl3 how many grams of srcl2 are produced?

Chemistry Enthalpy Question, explain pls Calculate the heat of reaction for 2 H2 + O2 = 2 H2O. Bond energies H2 436 kJ/mol, O2 498, HO 463?

What is the value of a?

mol of nitrogen in 0.40 mol of caffeine.?

rubber cement contains a polymer of 2-methylpropene (isobutylene) called polyisobutylene. write an equation for the polymerization reaction?

Chemical equations?

have 500.0 g of water at 50.0 ◦C, how much energy would it take to turn it all into water vapor at 1 atm (Lf = 334 J/g and Lv = 2,260 J/g)?