Select the property that is a characteristic of the group 14 (4A) element carbon. O it forms extended compounds with oxygen and aluminum several allotropes of the pure element exist O it is combined with other metals to form the alloys bronze and pewter O it forms oxide and chloride compounds that are used in the production of fiber optics

A nutrition table lists apples with a potassium content of 4600 mg/pound. Assume an average apple is 75.0 g, the minimum daily intake for potassium for a healthy adult is 3500. mg per day. Calculate the number of apples per day to meet this requirement for a healthy adult. Assume 454 g = 1 pound. O 7.96 apples per day O 0.126 apples per day O 0.217 apples per day O 4.61 apples per day

Lead is found in Earth’s crust as several different lead ores. Suppose a certain rock is 38.0% PbS (galena), 25.0% PbCO3 (cerussite), and 17.4% PbSO4 (anglesite). The remainder of the rock is composed of substances containing no lead. How much of this rock (in kg) must be processed to obtain 5.0 metric tons of lead? (A metric ton is 1000 kg.)

Mass of 250 mL beaker (pe(Onju Mass of copper turnings + 250 mL beaker 101.73, O.47 68.32 69.7L Mass of copper turnings Teoeiq Hool nollasen svnb Mass of evaporating dish SnoitonoR Mass of evaporating dish + copper (before drying) Mass of evaporating dish + copper (after drying) EHOsn Mass of product (copper recovered) Seosig ool noitose1 s yitnsbi uov bib wok Percent Recover of Copper (Show Work): mass of product (recovered) mass of copper turnings eonsle (e)s(HO)O Percent Recovery = *100 %3D

Platinum is a precious metal that is used as a catalyst for many important industrial reactions. Platinum can be purified by reacting platinum(IV) bromide solution with aluminium metal. To test this purification process, a student reacted 14.4 kg of aluminium metal with excess platinum(IV) bromide solution. After the reaction was complete, the student had extracted 75.4 kg of platinum metal. From this data, calculate the percent error of this experiment.Hint: Write a balanced chemical reaction equation and calculate the theoretical yield of platinum first.Do not show your work in the space provided.Record only your final answer with the correct number of significant digits and the proper units.

Which of the following statements is FALSE? The mass percentage of calcium in calcium phosphate is an extensive property. Mixtures can be separated into substances by physical methods. O Density is an intensive property. O Separations of a solid from a liquid by filtration is an example of a physical process. O The mass percentage of calcium in calcium phosphate is an extensive property.

What is the correct answer?

Taking into account that the spheres represent atoms, indicate:a) if the represented systems correspond to mixtures or notb) if the substances are simple or compound.c) In what state of aggregation are they?

Please answer number 7

Platinum is a precious metal that is used as a catalyst for many important industrial reactions. Platinum can be purified by reacting platinum(IV) bromide solution with aluminium metal. To test this purification process, a student reacted 14.6 kg of aluminium metal with excess platinum(IV) bromide solution. After the reaction was complete, the student had extracted 75.4 kg of platinum metal. From this data, calculate the percent error of this experiment. Hint: Write a balanced chemical reaction equation and calculate the theoretical yield of platinum first. Do not show your work in the space provided. Record only your final answer with the correct number of significant digits and the proper units. Answer: Evaluate your calculated percent error, is this an acceptable percent error?