Chemical substances can be solids, liquids, gases, or plasma. Pure chemical compounds are substances composed of bonded molecules or ions. For example, pure water is s chemical substance since it always has the same ratio of hydrogen to oxygen. However, seawater is a mixture since it contains ...
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根据第二段中"Among them is a substance called ECOncrete, developed as an eco-friendly concrete. ECOncrete produces bio enhancing concrete products intended to protect coastlines and marine resources. This is achieved by using a mixture made almost entirely of by-products and recycled materials, and...
Classify whether seawater is a pure substance, heterogeneous mixture, or a solution. Determine the percent of water of crystallization in pure sample of green vitriol (FeSO_4.7H_2O). Which of the following observations is quantitative? a. The liquid turns blue ...
5.They suggest these increases mark moments when the amount of oxygen in seawater went up, because more oxygen would mean more oxidisation of buried organic matter. 6.This was developed by the American navy as a rocket propellant, a substance which involves the sudden release of energy by ra...
respectively. Hyde Park contains 2 tons of a type of dioxin (2,3,7,8 TCDD) which is possibly the most toxic substance that has ever been produced. In higher organisms, TCDD is transported to the cell nucleus where it attacks DNA. Seventy parts per trillion (70 ppt) of TCDD is enough...
Transfer of juvenile coho salmon prematurely into seawater decreases IGF-I levels and growth, although GH levels increase. In coho salmon, GH appears to be important for seawater adaptation, although it does not seem to be important in all teleosts examined. IGF-binding proteins are described for...
What is the pH of a substance that has an equal number of hydrogen ions and hydroxide ions?Water:Water is typically considered one of the crucial universal solvents with a wide range of uses at the individual level and the community. Water is the ultimate need fo...
All rainwater contains some level acidity(酸性).Acidity is measured by PH,which stands for potential of hydrogen(氢).The PH scale measures the amount of acid in a substance.PH is measured on a scale from 0 to 14,with 7 being neutral(中性的).The lower the number is on the PH scale,th...
Is seawater classified as a mixture or a pure substance? Explain. What is the difference between sodium chloride and sodium chlorite? Explain why a magnesium atom is bigger than a sodium atom. Why does the vapor pressure of water decrease when NaCl is added to it?