A substance that consist of two elements is one IN WHICH THE ELEMENTS ARE CHEMICALLY COMBINED IN A FIXED PROPORTION.A compound is a substance that is made up of two or more elements which have undergone chemical reaction together and their individual properties have been lost during the reaction, thus a compound has properties that are different from those of its constituents elements. Compounds are usually combined in specific fixed ratio.
A chemical change is a change that cannot be reversed, usually chemically combining the elements together (hence the name). The composition of the element also changes.
When boiling the egg, the yolk and the liquid inside both undergo a chemical change. You will notice that the yolk and liquid cannot be liquified again.
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The answer is A H2PO4<span>– </span>+ H2PO4<span>– </span><span> HPO</span>42– + H3PO<span>4</span>
Answer:
B. City B
Explanation:
From the weather chart, you can see that rain is indicated by the dot(.) sign. One dot means light rain and two dots mean steady light rain. The circle shading will show how much cloud in the city, ranging from no cloud(white circle), half covered (half black circle) and completely covered(black circle).
City A has neither cloud nor rain.
City B is completely covered by cloud and have steady light rain.
City C is half-covered with cloud, without rain.
