Question

Need a little help.

A pain-relieving pill has a mass of 0.005 g. Express the pill’s mass in grams using scientific notation or in milligrams.

Express your answer in scientific notation to one significant figure or use a prefix on the unit.

Answer 1

@Vocaloid

Answer 2

Can someone teach me the basics of scientific notation here?

Answer 3

alright

we can express very large or very small numbers by

___ * 10^____

where the first blank contains a number from 1 to 9.9999etc. and the second blank contains a whole number exponent. positive exponents indicate numbers greater than 0 and negative exponents indicate numbers less than 0

Answer 4

the exponent tells you how far left or right to move the decimal point

ex: 1.2 * 10^3 tells you to take 1.2, move the decimal point three places to the right to get

1200

1.2 * 10^(-3) tells you to take 1.2 and move the decimal point three places to the left to get

0.0012

Answer 5

of course, your problem gives you the number and asks for scientific notation

the base of 0.005 is 5 (since 5 is between 1 and 9.99999etc.)

since 0.005 is less than 1 we want a negative exponent

so we just need to count how many decimal points to move from 5 to 0.005 and put that into the blank

5 * 10^(-____)

Answer 6

made a small typo in the first paragraph

"where the first blank contains a number from 1 to 9.9999etc. and the second blank contains a whole number exponent. positive exponents indicate numbers greater than 0 and negative exponents indicate numbers less than 0"

should be greater than 1, less than 1, not 0

Answer 7

3?

Answer 8

sorry was writing notes

Answer 9

sorry was writing notes

Answer 10

good

so 0.005 g = 5 * 10^(-3) g

Answer 11

the question also states you can use a prefix to express g in mg

g to mg is just a multiplication by 1000

so 0.005g = 0.005 * 1000 mg as an alternative solution

Answer 12

so 5g as an answer

Answer 13

be careful, if you use the alternative route it would be 5 mg

Answer 14

Just screwing up on the unit

Answer 15

A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car

Answer 16

I got 48 because its distance/time

Answer 17

i think you divided time/distance

distance / time would be 150/7200 km/s

Answer 18

but do I put the decimal or just the fraction

Answer 19

they would probably want you to simplify

so 150/7200 = 0.021 km/s