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What is the evolutionary significance of the fact that 90% of human genes are also found in mice, 50% of human genes are also found in fruit flies, and 31% of human genes are also found in baker’s yeast?
Read "The Selfish Gene" by Richard Dawkins.
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Why would the presence of protein in the urine indicate kidney damage? Also, why should the presence of glucose in the urine cause concern?
Urine is blood filter ate. Small quantities of albumin is always present in urine. But if this increases shows glomerular damage. Glucose if is more than 150 MG per...
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Do elements have similar chemical and physical properties when they are located in the same group or period?
The $"Periodic Table"$ reflects electronic structure; i.e. specifically the number and symmetry of the . Given the same number of , elements of the same Group should exhibit similar chemistry,...
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Which property of physical changes explains why matter is conserved in a physical change?
Mass is always conserved in a chemical change, which process involves involves the rearrangement of atoms and molecules. Of course most physical changes also conserve mass: when $10*g$ of liquid...
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A chemical compound requires 8 ounces of Chemical A and 12 ounces of Chemical B. A mixture contains 24 ounces of Chemical A and 30 ounces of Chemical B. How can you fix the mixture to make the chemical compound?
Since 8x3=24 and since 12x3=36 you need to add 6oz of chemical B to have 24oz of chemical A and 36oz of chemical B. Take 1/3 of the total mixture...
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What is the similarity in chemical properties of the atoms of elements in a group of the periodic table is most closely related to?
Atoms from the same Group of have the same number and symmetry of , and this electronic similarity should give rise to similar chemistry. And indeed it does.......
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Are there changes in the physical and chemical properties of a substance when it undergoes a physical change? Is the same true for chemical changes?
...i.e.. solid to liquid, liquid to gas...and vice versa. And certainly, , mass per unit volume, changes markedly upon a phase change between a condensed phase, solid or liquid, and...
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Water and hydrogen and peroxide ($H_2O_2$) both consists of hydrogen oxygen atoms. Why do they have different chemical and physical properties.?
The Law of Multiple Proportions states that when 2 form a series of , the ratios of the masses of the second element that combine with 1 gram of the...
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State the difference between a physical change and a chemical change, and list three indications that a chemical change has occurred. Which indication is most suggestive of a chemical reaction?
Physical changes are changes in the formation or state of molecules and atoms. The arrangement of the molecules and atoms is different after the change but the chemical composition of...
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What is the difference between the physical properties and the chemical properties of a substance?
A physical property of a substance is one you can observe, for example, color. A chemical property is seen when you change the chemical identity of the substance by performing...
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