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express the null hypothesis and alternative hypothesis in notation form of the scenario " it is believe that we that the mean yearly salary of professors in the philippines is 480,000.00 p pesos. a random sample of 65 professors revealed a mean salary of 500,000.00 pesos. can it be concluded the the mean salary is greater than 480,000.00 pesos? give the solution
Balance the following redox reaction using the half-reaction method.
Fe2+(aq)+Cr2072-(aq)->Fee+(aq)+Cr3+(aq)
Is the reactant undergoing oxidation or reduction in each of the following incomplete chemical equations? Justify your answer.
- SnO2 → SnO
- C6H6 → C6H12
- KClO3 → KCl
- NO → NO2
- MnO4-2 → MnO4-
Balance the following redox reaction that takes place in an acidic solution using the oxidation number method: Fe203(s)+CO(g)-Fe3(aq)+Cr3+(aq)
during a particular chemical reaction it takes 100Kj of energy to break all the bonds and 150 Kj of energy is released when the new bonds form. Which is true about the overall reaction?
1. it is endothermic and absorbs energy
2. it is exothermic and releases 50 Kj
3. It is exothermic and releases 150 Kj
4. it is endothermic and releases energy
2. State at least 2 application of cryptography in engineering.
A 4.00 * 102 g piece of iron at 22.0°C is heated in a bomb calorimeter until the temperature is 250.0°C. If the iron absorbs 41.04 kJ of heat, what is the specific heat capacity of the iron?
between 0 and 0.47
Average salinity of coastal waters of Cyprus is 39.1 psu Calculate the salinity in: a) percentage, b) ppt c) ppm d) molarity (Assume that salinity is due to dissolved NaCl, and the density of Mediterranean sea is 1.05 g/mL) (psu: Practical salinity unit, 1 psu = 1g/kg, MNAC= 58.4 g/mol) Ans: a) 0.39%, b) 39.1 ppt, c) 39000 ppm, d) 1.568 M Ans: a) 3.91%, b) 39.1 ppt, c) 39100 ppm, d) 0.71 M ...
It is desired to obtain a volume of 1.00 L of nitrogen (N2) at 100.00 C and 640.00 mmHg. How many moles of nitrogen (N2) would be required
