The Famous Toy Makers SUPERSHEETS
1 Which of these statements best summarizes the section titled "Three-layer Cake"?
A
Earth is like a cake. The mantle is the cake. The core is the center of the cake. It is a very
hot layer. The crust is a thin layer of icing on the cake.
Earth is made up of three layers. The top crust is the thinnest layer of Earth. The thickest
layer, mantle, sits below the crust. Core is the hottest layer found at the center of Earth.
Earth looks like a cake. The mantle is the middle layer. It is also the thickest part. It
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makes up 84 layers out of 100 layers of Earth. The core is the hottest layer.
Earth has 100 layers. The top layer, crust, is only 30 miles thick, but the mantle is 1800
D miles thick. So, mantle is the thickest layer of Earth. But most of the living things live on
the crust.

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl+4h2o enter the elemental symbol. view available hint(s) is reduced

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?