Master Chemistry with Fun Quizzes & Brain Teasers!

How many valence electrons does carbon have available for bonding to other atoms?a. 2b. 4c. 6d. 8
1 Answer
For each phase change, determine the sign of H and S. Place the appropriate items to their respective bins.a. Sublimationb. Freezingc. Boilingd. Depositione. Meltingf. Condensation
1 Answer
what is a limitation of the arrhenius model of acids and bases?
1 Answer
please help asap!3. A double replacement reaction occurs between two solutions of lead (II) nitrate and potassium bromide. Write abalanced equation for this reaction-identifying the product that will precipitate, and the product that will remain insolution.a) Write the balanced equation for this double replacement reaction.b) If this reaction starts with 32.5 g lead (II) nitrate and 38.75 g potassium bromide, how many grams of theprecipitate will be produced? Remember to use the limiting reactant to calculate the amount of precipitateformed.c) How many grams of the excess reactant will remain?
1 Answer
Suppose two students grab an end of a rope. Both shake the rope once,but one makes a crest and the other a trough traveling at each other. What wouldyou see when the crest and trough meet? What type of interference does this show?
1 Answer
9. calculate the ph of a buffered solution prepared by dissolving 21.5 g benzoic acid and 37.7 g sodium benzoate in 200.0 ml of solution.
1 Answer
Phosphorus-32 has a half-life of 14. 0 days. Starting with 8. 00 g of 32P , how many grams will remain after 98. 0 days ?
1 Answer
Katja plans an experiment that measures the temperature of different colors of paper placed in sunlight. her hypothesis is that if black, blue, yellow, red, and white sheets of paper are exposed to white light, then the black sheet of paper will increase the most in temperature. katja will place a sheet of each color of paper of the same size and thickness in the same location for the same amount of time. why will katja use different colors of paper in her experiment?
1 Answer
A boy kicks a ball with a force of 40 n. at exactly the same moment, a gust of wind blows in the opposite direction of the kick with a force of 40 n.what happened to the ball?
1 Answer
Why a pyramid shape is a good way to model the relative amount of energy in different group of organisms in a food chain
1 Answer
An experiment you are conducting asks you to heat up a piece of steel (0. 452 J/(gC)) from 20oC to 100oC and then place it into 32 grams of liquid ethanol (2. 45 J/(gC)) at 30oC. What is the final temperature of your ethanol and steel?
1 Answer
Predict the phenotypic and genotypic outcome (offspring) of a cross betweenntwo plants heterozygous for round peas
1 Answer
Let say that I want to get my mixture to a certain pH but I add too much water to my solution.Can I just add the same volume of my substance as the water I added back into the mixture to get my initial pH?
1 Answer
You have a solution of copper sulfate with a volume of 2 dm3. The concentration of the solution is 12 g/dm3. What is the mass of the copper sulfate?
1 Answer
How much propane is used to produce 1000 grams of water
1 Answer
Fill in the blank with the correct word or phrase. Darwin proposed a new theory of how evolution works, which he called (za blank fill zis in)
1 Answer
Using your own words, describe the transformation of energy from one form to another. Include an example in your explanation
1 Answer
I take 50.0 ml of 0.50 m hcl and add it to 150.0 ml of 0.10 m hno3. what is the ph of the resulting solution?
1 Answer
the process in which an atom or ion experiences a decrease in its oxidation state is _____________.
2 Answers
Part APredict the sign of the entropy change, S, for each of the reaction displayed.Drag the appropriate items to their respective bins.HelpResetAg+(aq)+Cl(aq)AgCl(s)2KClO3(s)2KCl(s)+3O2(g)2N2O(g)2N2(g)+O2(g)2Mg(s)+O2(g)2MgO(s)C7H16(g)+11O2(g)7CO2(g)+8H2O(g)H2O(l)H2O(g)PositiveNegativeSubmitHintsMy AnswersGive UpReview PartPart BCalculate the standard entropy change for the reaction2Mg(s)+O2(g)2MgO(s)using the data from the following table:SubstanceHf (kJ/mol)Gf (kJ/mol)S [J/(Kmol)]Mg(s)0.000.0032.70O2(g)0.000.00205.0MgO(s)-602.0-569.627.00Express your answer to four significant figures and include the appropriate units.S =
1 Answer
Cayden wanted to make some curd. He took some warm milk and added a spoonful of old curd into it. He then kept the milk in his fridge. After 8 hours he took it out. Will he succeed in making curd? Justify your answer. Is there anything you would have done differently or would you follow the same procedure?
1 Answer
An unidentified gas a density of 2. 40 g/L when measured at 45C and 820 torr pressure. Calculatethe molar mass of this gas
1 Answer
How to find out if a solid, more specifically powdered cement, is acid or alkali?
1 Answer
Penny contains 1.5 x 1023 atoms. use a conversion to calculate the mass of copper in the penny. the molar mass of copper is 63.55 g/mol.
1 Answer