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What is the scientific definition for the word element?
!!A pure substance that cannot be separated or broken down into simpler substances by ordinary chemical means!!
What substances is the usual reference point for the density of other substances?
The density of a substance is its mass per unit of volume. Density will be in units of mass (i.e. grams, kilograms, milligrams, etc.) over volume (cubic meter, cubic foot, liters, milliliters, etc.) For example, the density of water at 20 degrees Celsius is: kg 998 ----- m3
Is the volume of gold 20g greater than the volume of lead 10g?
We need to calculate the volume of a metal from the density to be sure. Density of pure gold = 19.3  g·cm-3Density of pure lead = 11.34  g·cm-3The volume of 20 g of gold = mass/density = 20 [g] / 19.3  g·cm-3 = 1.036 cm3 The volume of 10 g of lead = mass/density = 10 [g] / 11.34  g·cm-3 = 0.882 cm3 Hence, the volume of 20 g of gold is slightly greater than that of 10 g of lead. =========================
How much are regular brass knuckles worth?
They are usually just around $10 to $20
How much does Scientific American Mind magazine cost?
The price of a single issue of Scientific American Mind magazine will vary from place to place. One will typically find it for around $3. A subscription could likely be acquired for around $20.
Is calcium a pure substance?
Yes. Calcium is an element, and it has the atomic number 20 and Ca is its chemical symbol. It is a metal, and one of the alkali earth metals which are the elements in Group 2 of the periodic table. It is reactive, and as such is not found free in nature, but always appears in compounds with other elements. Wikipedia has additional information, and a link is provided.
What percentage of the air around is pure oxygen?
Air contains about 19-20% oxygen
What is the answer to the March 20 2008 Wheel of Fortune bonus or final puzzle?
PURE OXYGEN pure oxygen mar 20 2008 it was pure oxygen
Why is pure oxygen stored as a liquid under pressure?
Because it would otherwise mix with air, making it impure.
Are homogeneous mixtures always pure substances?
well according to the theory of the father of chemistry which is Jon mcdale says that if u multiply 20 by 2 then - 5 calculate the percentage to the nearest tenth multiply by 100 then it will give u the answer which is homogeneous substances are always pure so yes they are :D ignore wat i said now lol
Why elements and compounds are called pure substances?
Matter that has exactly the same composition is classified as a pure substances or simply a substance. Every sample of a given substances has the same properties because a substances has a fixed uniform composition. Substances can be classified into tow categories elements and compounds
What gas is 20 degrees Celsius?
There are thousands of substances which are gas at 20 deg C.
Which has a higher freezing point a 20 percent salt solution or pure water?
Pure water has a higher freezing point than 20% salt water.
Are all substances solid at 20 degrees celsius?
Definitely not! Not even all the elements are solid, and there are millions of liquid organic substances.
What are compounds and elements called?
substances
What is chloride like at 20 degrees?
pure sodium chloride is white
What is the average speed of particle motion of substances with a large amount of thermal energy?
20
