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how was viscosity measured in the "viscosity" lab?

directly with a viscosity meter

indirectly by measuring the distance a liquid flowed in a given time

indirectly by measuring the volume of honey

directly with a spring scale

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? question 7 options: the heat from the hot water is conducted through the spoon handle the hot water heats the air surrounding the upper part of the spoon. the hot water causes a physical change in the spoon handle. the hot water causes a chemical reaction to take place in the spoon.

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.