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Find exact value of expression. show work. please show easy way.
If the player's ball weighed 40g, and theopponent's ball weighed 45g, how far apart were the centres of the two tunnels?
What is the difference between a linear function and a quadratic equation?
How many years are required for a "chunk" of thermally insulated granite to increase in temperature by 400°C.The specific heat capacity of granite is 800J/Kg°C.
Find functions f and g so that h(x)= (f*g)(x) h(x)=1/ x^2-8
Complex conjugate roots: Suppose that the equation ax^2+bx+c=0 has real coefficients and the complex roots. Why must the roots be complex conjugates of each other?
A buffer contains 0.40M base, B, and 0.25M of its conjugate acid, BH+, and has a pH = 8.88. What is the pH after 0.0020mol of HCl is added to 0.25L of this solution? (assume HCl adds no volume to th
Find the lengths of both circular arcs of the unit circle connecting the point (1,0) and the endpoint of the radius that makes an angle of 3.90 radians with the positive horizontal axis.
Each function graphed is of the form y=a sin bx or y=a cos bx, where b greater than 0. Determine the equation of the graph.
The leaf then floats down the river at 3ms-1 FOR 20 seconds until it gets caught on a rock. How far and in what direction from the base of the tree is the rock?
Prove the sine, cosine, and tangent sum formulas for all real values, and derive special applications of the sum formulas (i.e half angle, double angle).
Devise a reaction scheme to make ethanol from propanoic acid. Several steps may be required. For each reaction include any reagents/catalysts and reaction conditions.
Write a reaction mechanism to show how propanoyl chloride is converted to propanamide using ammonia. Show how the diazonium ion in i) can couple with phenol to form the azo compound.
Calculate the pressure (in atm) of 16.80 mol of CO2 gas in a 3.00 L vessel at 153 K with: (a) the ideal gas law
The angle of elevation from the top of a house to a jet flying 2 miles above the house is x radians. If d represents the horizontal distance, in miles, of the jet from the house, express d in terms
Nucleophilic substitution reactions: an example of an SN1 and an SN2 including the stereochemical consequences. Mark on your reaction scheme which is SN1 and which is SN2.
Explain how the haloform reaction can be used to distinguish between butan-2-one and propanal. Include a reaction mechanism for any reaction which occurs.
Calculate the pH of a solution prepared by mixing 250. mL of 0.174 m aqueous HF (density = 1.10 g/mL) with 38.7 g of an aqueous solution that is 1.50% NaOH by mass (density = 1.02 g/mL).
Write balanced equations to show how ethyl ethanoate can be made from a) acid halide and b) an acid anhydride.
Question: In a reaction, 34.6 g of chromium(III) oxide reacts with 12.3 g of aluminum to produce chromium and aluminum oxide. If 23.7 g of chromium is produced, what mass of aluminum oxide is produc
The decomposition of dinitrogen pentaoxide has and activation energy of 102 kj/mol and delta H degree rsn = + 55 kj/mol. What is the activation energy for the reverse reaction?
The binding energy for chromium metal is 4.37 eV. What wavelength of radiation must be used to eject electrons with a velocity of 1.05x10^3 km/s?
What is the density of a gas in g/L that has a molecular weight of 144, if the temperature and pressure is 25 degree C and 750 mmHg?
Calculate the pH of a buffer solution which contains 0.25 M benzoic acid (C6H5CO2H) and 0.15 M sodium benzoate (NaC6H5CO2). Given Ka = 6.5 x 10^-5
Question: A 0.1391 g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 1769 J/°C. The calorimeter contains exactly 281 g of water, and the tem