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Chemistry
Chemistry
High School
What is the importance of protons ?
Chemistry
High School
The equation, reactantsproduct + thermal energy, describes a(n)_____reaction.
Chemistry
Middle School
What two gases in the atmosphere do animals and plants need to breathe and grow?
Chemistry
High School
How is iodine 131 similar to a normal atom of iodine?
Chemistry
High School
Is sulfur dioxide a element?
Chemistry
High School
Given the standard heats of reaction Reaction H 0M(s) + 2 X2(g) MX4(g) 98.7 kJ/molX2(g) 2 X(g) +327.3 kJ/mol M(g) M(s) 20.1 kJ/mol calculate the average bond energy for a singleM-X bond.Answer in units of kJ/mol.
Chemistry
High School
What is a scale and why do you use it?
Chemistry
High School
All 6 sides of a cube measure 65mm. Calculate the volume of the cube in cm32
Chemistry
High School
What is the process called when the moon bagins to fade from full moon to new moon
Chemistry
High School
A black hole is aa. an object of zero volume and infinite densityb. an object from which nothing, not even light, can escapec. an object that emits x rays as matter falls into itd. an object that disappears from our universee. all of the above
Chemistry
High School
in your own words describe the process of a physical change
Chemistry
High School
During which process of the water cycle does water change from gas to liquid
Chemistry
College
Each orbit of an atom contains a set number of..........
Chemistry
High School
PLEASE HELP ME!! Water (H2O) is composed of the same elements as hydrogen peroxide (H2O2). Why do these substances have different properties?The molecules are the same.Water has more atoms than hydrogen peroxide.The atoms are arranged differently in each molecule.The atoms are the same.
Chemistry
College
What is matter?A.Anything that has energyB.Anything that changes volumeC.Anything that takes up spaceD.Anything that produces heata b c or d no bull
Chemistry
High School
calculate the oxidation number of s in S2O8^2-
Chemistry
High School
Flowering plants are the most successful group of land plants. This is due, in part, to the trait that could be the label for point C. in the cladogram. Consider the organization of the cladogram. What trait, besides flowers, is unique to this group of plants?
Chemistry
High School
Is the equation C2H4 > 2C + 2H2 + 52.3 exothermic or endothermic?
Chemistry
High School
which element has an atom with the following composition? 24 protons, 28 neutrons and 24 electrons.
Chemistry
College
A 10.151 g sample of window cleaner containing ammonia was diluted with 39.466 mL of water. Then 4.373 g of solution was titrated with 14.22 mL of 0.1063 M HCl to reach a bromocresol green end point. Find the weight percent of NH3 (FM 17.031) in the cleaner.
Chemistry
Middle School
Steps of Cellular Respiration: ___ Carbon dioxide molecules form.___ Sugar molecules are broken down.___ A flow of electrons produces chemical energy and water.
Chemistry
College
Describe the function of a cilia.
Chemistry
College
which type of wave shows energy transmitted in a definite direction and with a definite speed?
Chemistry
High School
A force is always a push. true or false ?
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