Which of these are examples of physical changes? Check all that apply. burning wood freezing water cutting paper iron rusting mixing water and acetone

What is the frequency in Hz of blue light having a wavelength of 440nm?

How many grams of NaoH are needed to nutralize 50 grams of H2SO4?

Heat is thermal energy transferred from one object to another because of a difference in

Using the ideas from this section and the periodic table, choose the more reactive metal. Al or Zn

1. Generally speaking, where on the periodic table are the elements that form ions requiring! Roman numeral in their names?

The thermal effect of the water formation reaction is 286 kj. what will be the thermal effect of its decomposition? why?

Given 13.5 grams of substance Z, if the substance absorbs 36 kilojoules of energy and the temperature increases by 25 degrees Celsius, what is the specific heat of the substance? 1.07 x 102 J/g·°C 1.22 x 104 J/g·°C 1.07 x 10-1 J/g·°C 1.

DNA is a nucleic acid made of building blocks called nucleotides. Which of the following options make up nucleotides?

A person drinks eight glasses of water each day, if each glass contains 300mL how many liters of water does a person drink in a year?

An organic compound contains C=61%, H=11.8% and O=27.12%. Calculate the empirical formula and molecular formula of the compound. The vapour density of the compound is 59.