Express each of the following numbers using scientific notation. 826.4 g 0.070 L

Question

Express each of the following numbers using scientific notation. 826.4 g 0.070 L 1800 s Would you classify an orange as an element, a compound, a heterogeneous mixture, or a homogeneous mixture? Explain. Solve the following equation: 7.4 times 10^/2998 times 10^8 John Dalton (1766-1844) proposed that mass is conserved in chemical reactions because small indestructible particles called atoms change how they are bound together rather than being created, destroyed, or changed into different atoms. In the last 250 years, Dalton's statement has been extensively tested. Would you consider his statement as an example of a scientific law or scientific theory? Explain briefly. Which of the following diagrams is a good microscopic representation of a solid? Briefly explain why.

Explanation / Answer

1)

a)

826.4 g

shift the decimal 2 places to the left

So, scientific notation becomes,

8.264*10^2 g

b)

0.070 L

shift the decimal 2 places to the right

So, scientific notation becomes,

7.0*10^-2 L

c)

1800 s

shift the decimal 3 places to the left

So, scientific notation becomes,

1.800*10^3 g

2)

There is solid, liquid and lot of other compounds in this

So, it is heterogeneous mixture

I am allowed to answer only 1 question at a time

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