NSCI 100 NSCI100 Quiz 3 with Answers (UMUC)
NSCI 100 NSCI100 Quiz 3
- If you have two molecules of TiO_2, how many oxygen atoms would you have?
- If you eat metallic sodium or inhale chlorine gas, you stand a strong chance of dying. Let these two elements react with each other, however, and you can safely sprinkle the compound on your popcorn for better taste. What is going on?
- Many of the macroscopic properties of a compound depend on ________.
- Which of the following has the greatest number of nonbonding pairs of electrons?
- How many valence electrons does gallium (Ga, atomic no. = 31) have?
- How do the electron-dot structures of elements in the same group in the periodic table compare with one another?
- Which of the following elements will most likely not form an ion at all?
- If a neutral atom loses one electron, what is the electrical charge of the atom?
- How many oxide ions (O^-2) are needed to balance the positive charge of a titanium ion (Ti^+4)?
- Which of the following substances is pure?
- If the relative mass of a pingpong ball is 1/20 that of a golf ball, how many pingpong balls would you need to equal the mass of two golf balls?
- What is the formula mass of sulfur dioxide, SO_2?
- The relative mass of carbon is 3/8 that of an oxygen molecule. How many grams of carbon are needed to have the same number of particles as found in 32 grams of oxygen molecules?
- How many grams of water can be formed from the reaction between 10 grams of oxygen and 1 gram of hydrogen?
- The nucleus of an atom is charged
- If you strip electrons from an atom, the atom becomes a
- The repeating trends that take place when examining the elements are called ________.
- Which chemical family is composed almost entirely of man-made elements?
- Which element would have chemical properties the most similar to chlorine (Cl)?
- Which of the following would be considered applied research?
- A TV screen looked at from a distance appears as a smooth continuous flow of images. Up close, however, we see this is an illusion. What really exists are a series of tiny dots (pixels). This is similar to a chemist's view of matter in that
- Which of the following is an example of a chemical change?
- Which of the following is an example of a physical change?
- Is aging primarily an example of a physical or chemical change?
- A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred?
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