Britany and Pablo hypothesize that a wagon will roll down a certain hill faster if it carries more mass. They time how long the wagon takes to go down the hill empty, with one passenger, with two passengers, and with three passengers. Then, they measure the distance down the hill to be 20 m and calculate the wagon's speed for each trial. The results are shown in the table below.
Number of Passengers Time (s) Speed (m/s)
0 4.3 4.7
1 4.6 4.3
2 5.2 3.8
3 5.9 3.4
Do the results support the hypothesis?
A.
Yes, because the speeds in this case are the same regardless of mass.
B.
Yes, because speed increases with increasing mass in this case.
C.
No, because the speeds in this case are the same regardless of mass.
D.
No, because speed decreases with increasing mass in this case.
Answers: 2
Chemistry, 22.06.2019 02:50, giiffnlojd
Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.
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Chemistry, 22.06.2019 17:50, kaylamount
Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?
Answers: 2
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