Chemistry, 23.07.2019 23:00 helplessstudent3

Give the number of significant figures indicated 6.695

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Answer from: jsilsby

Answer : The number of significant figures indicated in 6.695 are, four (4).

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

Rules for significant figures:

Digits from 1 to 9 are always significant and have infinite number of significant figures. All non-zero numbers are always significant. For example: 654, 6.54 and 65.4 all have three significant figures. All zero’s between integers are always significant. For example: 5005, 5.005 and 50.05 all have four significant figures. All zero’s preceding the first integers are never significant. For example: 0.0078 has two significant figures. All zero’s after the decimal point are always significant. For example: 4.500, 45.00 and 450.0 all have four significant figures. All zeroes used solely for spacing the decimal point are not significant. For example : 8000 has one significant figure.

According to the rules,

6.695 has 4 significant figures.

Hence, the number of significant figures indicated in 6.695 are, four (4).

Answer from: Quest

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

Answer from: Quest

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1

0.44 / 0.09 = 4.8

mgco3-5h2o"

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