This next picture shows 6 more substances to be tested. These will be burned in solid form. Note thatthere are 3 elemental powders, small pieces of charcoal, a wooden splint, and a piece of steel wool.Selenium powderSulfurCopper powderCharcoal Examine the photo above and write your observations of the substances in each of the 4 labeled bottles as well as the steel wooland wooden splint shown. The label on the bottle of charcoal mostly obscures the charcoal pieces inside, but you can use youroutside knowledge of charcoal to describe what you think is inside.

Burning or combustion is a chemical reaction In combustion the fuel or the substance reacts with oxygen and release heat and light. It is an exothermic reaction. The given substances for combustion are: Selenium powder, Charcoal, sulfur, copper powder, a wooden splint and a piece of steel wool.The main component of charcoal is carbon. Burning of charcoal forms carbon dioxide and heat. The chemical reaction is as shown below: C(g)+O2(g)→CO2(g)+heat Burning of sulfur : Burning of sulfur forms sulfur dioxide which has pungent smell. S8 (s) +8 O2(g) → 8 SO2(g)Burning of copper: Copper burns and form copper oxide which is a black compound. 2Cu(s)+O2(g)→2CuO(s) Burning of selenium : Selenium burns in oxygen and form selenium dioxide which is a colorless salt. Se(s)+ O2(g)→SeO2(s) Burning of steel wool: The main component of steel wool is iron. Iron on combustion forms iron oxide which is a brown solid. 4Fe(s)+3O2(g)→2Fe2O3(s) Burning of wooden splint: Wood is mixture of hydro carbons. When it is burnt, it forms carbon dioxide and water vapor along with heat and light.

Science

Chemistry

This next picture shows 6 more substances to be tested. These will be burned in solid form. Note that there are 3 elemental powders, small pieces of charcoal, a wooden splint, and a piece of steel wool.

This next picture shows 6 more substances to be tested. These will be burned in solid form. Note that there are 3 elemental powders, small pieces of charcoal, a wooden splint, and a piece of steel wool.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Your breakfast this morning was so nutritious! You had two eggs, a slice of toast and some orange juice. You were lucky, though... your mom noticed some smoke coming from the toaster and took your toast out before it burned. Thanks to her, your toast was a perfectly crunchy and light-brown in color: During this process, did the bread undergo a physical change or a chemical change? What evidence from the story or the image proves that you are correct?
1. Compare physical and chemical properties. 2. Why is it necessary to state the specific conditions by which an observation is made? 3. Suppose we have two pieces of same type of wood that are obviously different lengths. We then place both in water. It is observed that both piece floats. What makes length an extensive property?
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A hypothetical metal has a theoretical density of 11.47 g/cm3. This metal adopts a cubic crystal structure with an edge length of 0.387 nm and atomic radius of 0.137 nm. Find the atomic weight of this metal in g/mol. NA = 6.022 x 1023 atoms/mol. Express your answer in two decimal places only. Do not put the units.
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To determine the concentration of iron in an unknown sample, a chemist analyzed the sample five times and obtained the following results: 410.34 ppm, 424.03 ppm, 340.49 ppm, 112.05 ppm, and 207.96 ppm. If the accepted literature value for the concentration of iron in this sample is 405.35 ppm, determine the percent error for this set of analyses.
8. A chemist performs the same tests on the substances below. The results are recorded. Conductivity tests whether the following substances conduct electricity. A conductivity tester has a small bulb that can light up. Below are the results. Answer the questions that follow the chart. Conductivity Conductor Rating Tester Test Substance (good, poor, none) (Record light as off, dull, bright, or blinking) None Solid Salt Does not conduct. Solid Sugar Does not conduct. None Solid Wax Does not conduct. None Distilled Water Does not conduct. None Salt Water Conducts. Good Sugar Water Does not conduct. None Does not conduct. None Melted Wax
Have the substances mixed? CITE COLOR-BASED EVIDENCE to support your answer. Have the substances mixed? CITE CHARGE-BASED EVIDENCE to support your answer.
Choose the best answer among the choices under each question/ statement. Thank you