1. When a substance is burned, are all of the products of that reaction solid su
ID: 2130570 • Letter: 1
Question
1. When a substance is burned, are all of the products of that reaction solid substances that can be easily weighed?
A. Yes, because mass is conserved in a chemical reaction, all the products may be collected and easily weighed.
B. No, some of the mass may be destroyed through the reaction so not all the products are present to be easily weighed.
C. No, while solid substances can be collected and easily weighed, gaseous substances cannot.
2. Is a chemical element the same as a chemical compound? Explain.
A. Yes, a chemical compound is the same as a chemical element.
B. No, a chemical compound is a combination of chemical elements.
C. No, a chemical compound and a chemical element have nothing in common.
3. If sodium (Na), with an atomic weight of 23, combines with oxygen (O), with an atomic weight of 16, to form the compound Na2O, what is the ratio of the mass of sodium to oxygen that you would expect to react completely in this transformation?
________ :1
4. If carbon (C), with an atomic weight of 12, combines with oxygen (O), with an atomic weight of 16, to form carbon dioxide (CO2), how many grams of carbon would react with 32 g of oxygen?
________ g
5. Suppose that a photon has a wavelength of 630 nm (red).
(a) What is the frequency of this photon?
______ Hz
(b) What is the energy of this photon in joules?
_______ J
6. Using the Rydberg formula, find the wavelength of the line in the Balmer series of the hydrogen spectrum for m = 3. (n = 2 for the Balmer series.)
________ nm
Explanation / Answer
1) B
2) B
3) 3
4) 12
5)a. 270hz
5)b. 3.0 x10-19 J
6)654nm
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