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Questions in chemistry

[Homework Help] Perform the following mathematical operation and report the answer to the correct number of significant figures. $7.9256 \div 4.372=[?]$

[Homework Help] Perform the following mathematical operation, and report the answer to the correct number of significant figures. [tex]$0.0016 \div 0.849=$[/tex]

[Homework Help] Oct-3-yne condensed structural formula

[Homework Help] Label each of the following changes as a physical or chemical change. A. A mirror is broken. B. An iron nail corroded in moist air. C. Copper metal is melted. D. A catalytic converter changes nitrogen dioxide to nitrogen gas and oxygen gas.

[Homework Help] According to the duplet rule, a maximum of 2 electrons makes the K shell stable. Why does calcium, which has 2 electrons, react by losing 2 electrons?

[Homework Help] According to the duplet rule, a maximum of 2 electrons makes the K shell stable. Why does calcium, which has 2 electrons, react by losing 2 electrons?

[Homework Help] 4. (a) Distinguish between metals and nonmetals. (b) How are metallic sulphates prepared? (c) Define an alloy with a suitable example. What happens when: (any five) a) Sodium is burnt in the atmosphere of carbon dioxide. b) Zinc is dissolved in moderately concentrated nitric acid. c) Copper is heated with concentrated sulphuric acid. (d) Chlorine is passed over finely powdered aluminum. e) Lead is heated in air. f) Iron is allowed to react with very dilute nitric acid. (a) Explain the term functional group, with suitable examples. (b) How will you convert ethylene to formaldehyde? What happens when benzene is heated with concentrated sulphuric acid? (d) Write short note on polyvinyl chloride (b) Describe the convenient method for chlorine gas. (c) How does ammonia react with (i) Heated sodium (ii) Hydrochloric acid (iii) Copper sulphate solution

[Homework Help] Convert the boiling temperature of gold, $2966^{\circ} C$, into kelvin (K). [?] K

[Homework Help] If 100.0 g of ^14C decays until only 6.25 g of carbon is left after 28650 y, what is the half-life of this isotope?

[Homework Help] What is the purpose of the safety data sheet? A. To describe how a chemical is made in the factory. B. To indicate the location of your organization's Hazard Communication Program. C. To state the location of the spill kit for your work area. D. To provide important safety information about hazardous chemicals.