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Biology, 21.06.2019 16:00
Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesnāt break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water youād break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove
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Biology, 22.06.2019 01:30
Hedgerows have created a new ecosystem within britainās a. farms b. cities c. forests d. industrial areas
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Biology, 22.06.2019 02:30
How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?
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how do you determine the fraction of parent isotope remaining after 20,000 years if the isotope used...
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