91影视

These questions concern the work of J. J. Thomson. a. From Thomson鈥檚 work, which particles do you think he would feel are most important for the formation of compounds (chemical changes) and why? b. Of the remaining two subatomic particles, which do you place second in importance for forming compounds and why? c. Propose three models that explain Thomson鈥檚 findings and evaluate them. To be complete you should include Thomson鈥檚 findings.

You have a chemical in a sealed glass container filled with air. The setup is sitting on a balance as shown below. The chemical is ignited by means of a magnifying glass focusing sunlight on the reactant. After the chemical has completely burned, which of the following is true? Explain your answer. a. The balance will read less than 250.0 g. b. The balance will read 250.0 g. c. The balance will read greater than 250.0 g. d. Cannot be determined without knowing the identity of the chemical.

The formula of water is\(\mathrm{H}_{2} \mathrm{O}\). Which of the following is indicated by this formula? Explain your answer. a. The mass of hydrogen is twice that of oxygen in each molecule. b. There are two hydrogen atoms and one oxygen atom per water molecule. c. The mass of oxygen is twice that of hydrogen in each molecule. d. There are two oxygen atoms and one hydrogen atom per water molecule.

One of the best indications of a useful theory is that it raises more questions for further experimentation than it originally answered. Does this apply to Dalton鈥檚 atomic theory? Give examples.

Why is the term 鈥渟odium chloride molecule鈥� incorrect whereas the term 鈥渃arbon dioxide molecule鈥� is correct?

Evaluate each of the following as an acceptable name for water: a. dihydrogen oxide b. hydroxide hydride c. hydrogen hydroxide d. oxygen dihydride

Why is calcium dichloride not the correct systematic name for \(\mathrm{CaCl}_{2} ?\)

The common name for \(\mathrm{NH}_{3}\) is ammonia. What would be the systematic name for \(\mathrm{NH}_{3} ?\) Support your answer.

Explain the law of conservation of mass, the law of definite proportion, and the law of multiple proportions.

Consider the elements of Group 4A (the 鈥渃arbon family鈥�): C, Si, Ge, Sn, and Pb. What is the trend in metallic character as one goes down this group? What is the trend in metallic character going from left to right across a period in the periodic table?