The winner of a 10 km road race took half an hour to complete the race. Calculate her average speed. Give your answer in metres per second.

If you change peanuts into peanut butter is it a chemical or a physical change

What is a boundary between geologic units? geologic map geologic unit contact fault line

What will be the observations for the reaction: CuSO4 (aq) + NaOH (aq) its a two mark question so two observations at least.

Which of the following groups of people used chemicals found in nature to embalm their dead? A. Ancient Egyptians B. Babylonians C. Europeans D. Greeks

Select all that apply to diffusion. A solid cannot diffuse in to another solid. Solids can diffuse in liquids. Liquids can diffuse in liquids. It is the process of intermingling atoms from one substance into another.

Be sure to answer all parts. Which product (s) form (s) at each electrode in the aqueous electrolysis of the following salts? Select as many as apply.

True or false. elements in the same period have the same number of valence electrons

A base a. causes phenolphthalein indicator to change from colorless to pink. b. donates a proton in a proton transfer reaction. c. accepts electrons in an electron transfer reaction. d. produces hydrogen ions in solution. e. does none of the above.

Which of these is an indicator that a chemical reaction has occurred? precipitate forms temperature remains the same color is diluted mass increases

The half-life of isotope X is 3 days, how long will it take for one half of 10g sample to decay