Data

Copy and paste the text below. It is read-only. Select All

You are about to open a container of soy milk but notice that there are instructions to "shake well before serving". The soy milk is most likely a ? suspension Which is malleable? gold (not glass, pottery, or ice) Which has the highest viscosity? corn syrup (not milk, water, or OJ) A material that is malleable and contains electricity is most likely ? a metal What physical properties of nylon and leather make them good materials to use for shoelaces? durability and flexibility Filtration can be used to separate mixtures based on ? the size of their particles When a physical change in a sample occurs, which does NOT change? composition Which is a physical change? sawing a piece of wood in half Flammability is a material's ability to burn in the presence of ? oxygen A substance that has high reactivity ? easily combines chemically with other substances. Which is a chemical change? water breaking down into hydrogen and oxygen Which of the following is a clue of chemical change? a gas forms when vinegar and baking soda are mixed Ninety-nine percent of all the matter that can be observed in the universe exists as ? plasmas If you move a substance from one container to another and its volume changes, the substance is a ? gas In which of the substances (in the polka dot pictures) are the forces of attraction among the particles so weak that they can be ignored under ordinary conditions? Substance C Forces of attraction limit the motion of particles most in ? a solid What is the result of a force distributed over an area? pressure Which factors affect the pressure of an enclosed gas? Temp, volume, # of particles. Raising the temperature of a gas will increase its pressure if the volume of the gas ? and the number of particles are constant. Which will cause a decrease in gas pressure in a closed container? lowering the temperature If the volume of a cylinder is reduced from 4.0 liters to 2.0 liters, the pressure of the gas in the cylinder will change from 100 kilopascals to ? 200 kilopascals At a temp of 274 K, the gas in a cylinder has a volume of 4.0 liters. If the volume of the gas is decreased to 2.0 liters, what must the temperature be for the gas pressure to remain constant? 137 K Temp can be used to recognize a phase change because during the phase change, the temp of the substance ? does not change If a solid piece of naphthalene is heated and remains at 80 degrees C until it is completely melted, you know that 80 degrees C is the ? freezing AND melting point of naphthalene During what phase change does the arrangement of water molecules become more orderly? freezing Which about ice melting is true? Water molecules move from their fixed position. The phase change in which a substance changes from solid to a liquid is ? melting The phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first is? sublimation The phase change in which a substance changes from a gas directly to a solid is ? deposition Which phase change is an endothermic change? vaporization Which is an exothermic change? deposition The Greek philosopher Democritus coined what word for a tiny piece of matter that cannot be divided? atom Democritus thought that matter was made of tiny particles ? that could NOT be divided Which is NOT a part of John Dalton's atomic theory? Atoms contain subatomic particles. Which of the following most accurately represents John Dalton's model of the atom? a tiny, solid sphere which predictable mass for a given element Looking at the diagram of Rutherford's gold foil experiment, what caused the alpha particles to bounce straight back from the gold foil? nuclei in the gold atoms Who provided evidence for the existence of a nucleus in an atom? Ernest Rutherford In an atomic model that includes a nucleus, positive charge is? concentrated in the center of an atom Which subatomic particle has a negative charge? electron Which statement about subatomic particles is true? An electron has far less mass than either a protron or neutron Which is unique for any given element? the number of protons To find the number of neutrons in an atom, you would subtract what? atomic number from the mass number Suppose an atom has a mass number of 35. Which statement is true? The number of protons in the nucleus does not equal the number of neutrons. Which is true about oxygen 17 and oxygen 18? They are isotopes of oxygen What can you assume has happened if an electron moves to a higher energy level? The electron has gained energy Which represents the arrangement of electrons in Bohr's atomic model? Electrons travel around the nucleus in fixed energy levels with energies that vary from level to level. What does the electron cloud model describe? the most likely locations of electrons in atoms. Which provides the best analogy for an electron in an atomic orbital? a bee buzzing inside a closed jar. Mendeleev arranged the known chemical elements in a table according to increasing? mass In a periodic table, a set of properties repeats from? row to row Mendeleev gave the name eka-aluminum to an ? unknown element he predicted would have properties similar to those of aluminum The usefulness of Mendeleev's periodic table was confirmed by ? the discovery of elements with predicted properties In the figure with a blank periodic table, identify the segments labeled A and B. A is a period and B is a group. Moving from left to right across a row of the periodic table, which values increases by exactly one from element to element? atomic number One-twelfth the mass of a carbon 12 atom is used to define an? atomic mass unit How is the atomic mass of an element determined? Take a weighted average of the masses of the isotopes present in nature. Which is true about the metalloid silicon? It is a better conductor of an electric current than sulfur is. At room temp, none of the metals are? gases Which general statement does NOT apply to metals? Most metals are brittle THe column on the far left of the periodic table contains the ? most reactive metals Atoms of the most reactive elements tend to have ? one or seven valence electrons As you move from left to right across a period, the number of valence electrons ? increases An alkali metal has one valence electron, while an alkaline earth metal has ? two Which halogen is most likely to react? F (fluorine) Which gases emit colors when an electric current is applied? helium and neon To keep them from reacting, some highly reactive elements are stored in ? argon Which element is found in nature only in compounds? sodium Which element is found in most of the compounds your body except for water? carbon