What is a mesurement that describes how close the measurement comes to the true value

I don't understand what makes a covalent bond "polar." What exactly is polarity?

Which compound forms from 2 parts of hydrogen and 1 part of oxygen?

When light energy hits matter what energy is formed?

What is a isotope?

Which sentences describe ponds and lakes? These are water bodies formed from melting glaciers. However, their size can vary from a few square meters to thousands of square kilometers.

How much CO2 is produced from 10g of CH4?

Two components combine to create a binary ionic compound. Name one of them

True or false. The synthesis of giant molecules from components of repeating units is polymerization.

Which term names an environmental cost of fossil fuel consumption? A. cheap energy B. increased greenhouse gases C. renewable resource D. low pollution

Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change. True False