Chemistry

You can scratch graphite with your fingernail. What does this tell you about graphite? A. It breaks easily. B. Its not very hard. C. Its not very lustrous. D. It doesnt have much texture.
2 Answers
Ms. Clark is teaching her class about how plants make food for themselves. On the board, she has written this: __________ + air + water = food for plants
1 Answer
If a mineral isn't scratched by a fingernail, what can you conclude about the mineralshardness?It is at least a hardness of 4.0A mineral can't be tested by a fingernail.The hardness is more than 2.5.The hardness is less than 2.5.
2 Answers
Ca(OH)2Name this compound according to IUPAC nomenclature.A)calcium hydroxideB)calcum oxide hydrideC)calcium (II) hydroxideD)calcium (II) oxide hydride
2 Answers
The map shows the main streams and the the rivers near City A and City B, as well as the nearby factories and farmland, The arrows inthe diagram show the direction of the water flow. City A gets its water from the sunset River and City B gets its water from the Moth Lake. A liquid herbicide was applied to a farmland. What is the greatest risk of using the herbicide?Select One: It will pollute the water source for the city AIt will pollute the air for the City BIt will pollute the water source of city BIt will pollute the air for the city A
1 Answer
Free radical mono-halogenation of an alkane is typically conducted using bromine versus chlorine because A.the bromine radical is more reactive and therefore more selective. B.the chlorine radical is more reactive and therefore more selective. C.the chlorine radical is less reactive and therefore more selective. D.the bromine radical is less reactive and therefore more selective. E.none of these choices.
1 Answer
Ill give Brainliest to the first answerThe amount of elements on the reactants side of an isolated equation are ___________ the amount of __________ that are formed on the ________ side. *A)close to, ice crystals, coldB)less than, properties, chemicalC)equal to, elements, productsD)similar, molecules, presentE)more than, elements, products
1 Answer
what is the compound of p2o5
2 Answers
Which formula represents an alkane?1.C2H22.C2H43.C3H44.38
2 Answers
(Multiple Choice, 30 pts)A student wants to determine whether an unknown solid is an ionic compound. He puts some in water and finds that it does not dissolve. He says that this proves the solid is ionic. Which best evaluates the student's reasoning?A. He is incorrect, because water can dissolve ionic solids.B. The test proves nothing, because water dissolves all solids.C. He is correct, because polar liquids cannot dissolve ionic solids.D. The test proves nothing, because it only shows that the solid is a compound.(I know water is polar, so I think its a?)
1 Answer
Calculate the pH of a [0.000765) M solution of KOH
1 Answer
What reactants would you use to produce Mg(No3)2 and H2
1 Answer
How many grams of NaCl are needed to prepare 1.20 liters of a 2.00 M solution?
1 Answer
Question 2 options: The Galpagos tortoises are native to seven of the Galpagos Islands, a volcanic archipelago about 620 miles west of the Ecuadorian mainland. With lifespans in the wild of over ____________years, it is one of the longest-lived vertebrates. A captive individual lived at least ______________years!
1 Answer
I need the correct answer
2 Answers
A neutralization reaction has what two reactants?A acid and baseB - hydrocarbon and waterC acid and saltDhydrocarbon and base
1 Answer
In the reaction N2 + 3H2 - 2NH3, how manygrams of H, are needed to produce exactly I moleof ammonia?A. lgB. 2gC.3gD.4g
1 Answer
Question 1 of 102 PointsAn engineering team is conducting a wind tunnel test to examine theaerodynamics of a car it has designed. Which part of the engineering processis the team in?O A. Do the work.O B. Evaluate the results.O C. Improve and redesign.D. Identify a need.SUBMIT
1 Answer
HELP CHEM ASAP!!!!!!
1 Answer
A sample of gas occupies a volume of 120.0mL at a pressure of 0.75atm and a temperature of 295K. What will the volume be at a pressure of 1.25atm and a temperature of 345K?A)48mLB)84mLC)8mLD)4mL
2 Answers
Nitrogen gas has a volume of 10.00L when under a pressure of 1000. mmHg. If the temperature stays constant calculate the new volume if the pressure drops to 500.mmHg.
1 Answer
in a titration 20.0 mL of 0.150 M NaOH(aq) Solution exactly neutralize is 24.0 mL of an HCl solution what is the concentration of the HCl solution
1 Answer
60.0 g of NH Cl are dissolved in 100 grams of water at 60.0 C. This solution isAsupersaturatedBsaturatedunsaturatedDnone of the above
1 Answer
Which of the following is most likely a homogeneous mixture?O A. A tossed vegetable saladB. Chunky peanut butterO C. Chocolate chip cookiesOD. A vanilla milkshake
2 Answers