The number 0.000402 expressed in exponential notation is 4.02 times 10^-2 4.02 t

Question

The number 0.000402 expressed in exponential notation is 4.02 times 10^-2 4.02 times 10^-5 4.02 times 10^4 4.02 times 10^4 402 According to New York, NY local weather channel. New York City had the warmest Christmas Eve 2015 with a temperature of 67 degree F. This temperature is same as 67 degree C 35 degree C 19 degree C 55 degree C 20 degree C Which of the following is an example of a physical change? grinding coffee beans baking a cake Q burning coal digesting a cheeseburger converting water to hydrogen and oxygen The number of calories needed to raise the temperature of 32 g of water from 12 degree C to 54 degree C is (given the specific heat of water = 1.00 cal/g. degree C) 384 cal. 1.3 cal. 1300 cal. 1700 cal. 0.76 cal. Which of the following is a characteristic of the modern periodic table? A group is a horizontal row in the periodic table. A period is a vertical column in the periodic table. The elements in each group have similar properties. The atoms are arranged in the increasing order of their atomic mass

Explanation / Answer

4. The answer is D)4.02×10^-4

5. T°C = (T(F) - 32)/1.8 = (67 -32)/1.8= 19.4

So, the answer is c) 19°C

6. The answer is A) grinding coffee beans

7. q = weight of water × Heat capacity of water × (T2 -T1)

= 32 g× 1cal/Kmol × (54°C - 12°C)

= 1344 cal

Therefore, the answer is C) 1300 cal

8) The answer is E) the atoms are arranged in the increasing order of their atomic mass.

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