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Choose one chemical that humans add to water that is not present in lake water. Explain its purpose.
The Ministry of Natural Resources has sent you to sample two small lakes that are being considered sites for a fish farm. Below is the data you obtained during your sampling. Compare the sites and provide your recommendation for the best site. Provide your reasoning.
SITE A
Nitrate - 5pm
Phosphate - 3ppm
Dissolved O2 - 5.0ppm
pH - 6.8
SITE B
Nitrate - 1pm
Phosphate - 1ppm
Dissolved O2 - 9ppm
pH - 8.0
you are asked to identify two clear, colourless beakers full of solution as acidic or basic. State what you would expect to see if beaker A was an acid and beaker B was a base for each of the following properties:
BEAKER A vs BEAKER B
- Conductivity
- pH
- Bromothymol blue
- Reaction with zinc
- Taste
Bacteria and viruses are inactivated by temperatures above 137
∘
C
∘C in an autoclave. An autoclave contains steam at 1.00 atm
atm and 100
∘
C
∘C.
At what pressure, in atmospheres, will the temperature of the steam in the autoclave reach 137
∘
C
∘C, if n
n and V
V do not change?
1. A certain research center requires an IQ score above 131.5.
Assume IQ scores are normally distributed with mean of 100 and standard
deviation of 15. Nine candidates took IQ tests. Find the probability that the IQ
score of a randomly chosen individual is at least 131.5?
2. A Company which produces cigarettes claims that it has now reduced the
amount of nicotine. The Supporting evidence consists of a random sample of 40
cigarettes and gives mean amount of nicotine 0.941 g and a standard deviation of
0.313g. What is the probability that mean nicotine amount is greater than 0.882 g.
Ca(s)+HgNO3(aq)→Ca(NO3)2(aq)+Hg(s)
Express your answer as a chemical equation
Number plates in an Arab country consist of 3 letters (chosen from a specified set of 20 letters from the Arabic alphabet) and 4 digits (from 0 to 9).
Find the probability of a plate having identical letters.
Find the probability of a plate having identical digits.
A ball kicked horizontally at 10.0m/s from a cliff 80m high. How far from the base of the cliff will the stone strike the ground?
Compute the 95 percent interval estimate of ų given ó = 9, n=40 and x= 115
Determine the precision of these two approximate values
a) 32000ft
b) 1.20×10(--5)ms
