Chapter 1: Q28 E (page 56)
Classify each of the following changes as physical or chemical:
(a) coal burning
(b) ice melting
(c) mixing chocolate syrup with milk
(d) explosion of a firecracker
(e) magnetizing of a screwdriver
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
Express each of the following numbers in exponential notation with correct significant figures:(a) 704
(b) 0.03344
(c) 547.9
(d) 22086
(e) 1000.00
(f) 0.0000000651
(g) 0.007157
Express each of the following numbers in scientific notation with correct significant figures:
(a) 711.0
(b) 0.239
(c) 90743
(d) 134.2
(e) 0.05499
(f) 10000.0
(g) 0.000000738592
The density (d) of a substance is an intensive property that is defined as the ratio of its mass(m) to its volume (V).
\(\begin{aligned}{\rm{density = }}\frac{{{\rm{mass}}}}{{{\rm{volume}}}}\\{\rm{d = }}\frac{{\rm{m}}}{{\rm{v}}}\end{aligned}\)
Considering that mass and volume are intensive properties, explain why their ratio, density is intensive.
Question: Solve these problems about lumber dimensions.
a) TO describe to a European how houses are constructed in the US, the dimensions of “Two-by-four” lumber must be converted into metric units. The thickness × width × length dimensions are 1.50 in. × 3.50 in. × 8.00 ft in the US. What are the dimensions in cm × cm × m?
b) This lumber can be used as vertical studs, which are typically placed 16.0 in. Apart. What is that distance in centimetres?
Which molecule has a molecular mass of 28.05 amu?
(a) \({\rm{HC}} \equiv {\rm{CH}}\)
(b)
(c)
What do you think about this solution?
We value your feedback to improve our textbook solutions.
