What is the name of the piece of lab equipment in the illustration? A. watch glass B. graduated cylinder C. beaker D. flask Which statement is not an appropriate lab safety rule? A... What is the name of the piece of lab equipment in the illustration? A. watch glass B. graduated cylinder C. beaker D. flask Which statement is not an appropriate lab safety rule? A. Wear protective glasses or safety goggles for all laboratory work. B. Check chemical labels twice to make sure you have the correct substance. C. Report any laboratory accident, no matter how small, to your teacher immediately. D. Pour all used chemicals down the drain when your experiment is complete. Which piece of lab equipment would you use to measure the volume of a liquid most accurately? A. test tube B. graduated cylinder C. beaker D. hot plate What is the density of a liquid if the volume is 25 mL and the mass is 20 g? A. 0.8 g/mL B. 1.25 g/mL C. 45 g/mL D. 500 g/mL CaCl2 is an example of A. a phase. B. an element. C. a metal. D. a compound. Which information can you determine about a chemical reaction from a complete chemical equation? A. color of the products B. how fast the reaction occurs C. how much energy is released as heat D. formation of a solid precipitate Which statement is not a description of a chemical reaction? A. A solid is dropped into a beaker of liquid and a gas is released. B. Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker. C. A solid is dropped into a beaker of liquid and an explosion occurs. D. A liquid is heated on a Bunsen burner and its temperature rises. What is the correct way to represent a solution of copper nitrate? A. Cu(s) B. Cu(aq) C. Cu(NO3)2(s) D. Cu(NO3)2(aq) You measure out 30,000 mg of table salt, NaCl (s). How many grams is that? A. 30,000,000 g B. 30 g C. 0.3 g D. 3 g Vivian noticed a metal object lying by the railroad tracks. She believes the object may have originally been a copper penny that was run over by a train. What information about the metal object would be most useful in determining if her hypothesis is correct? A. its density B. its mass C. its texture D. its volume Which is not part of the definition of matter? A. It can be seen. B. It has mass. C. It has volume. D. It takes up space. The diagrams show 15 mL of water in one graduated cylinder and a rock sample in another. How can you use one or both graduated cylinders to determine the volume of the rock sample? A. Additional equipment is necessary to determine the volume of the rock sample. B. Pour the 15 mL of water into the second graduated cylinder and read the water level. C. Pour the 15 mL of water into the second graduated cylinder and subtract 15 mL from the resulting water level. D. Read the mark at eye level on the second graduated cylinder that is at the same height as the very top of the rock sample. At room temperature, most of the elements in the periodic table are A. solids. B. gasses. C. nonmetals. D. metalloids. Which of these elements would you expect to have the greatest reactivity? A. neon, Ne B. cesium, Cs C. boron, B D. gold, Au What would you expect to see if you performed the chemical reaction shown below? 2H2O2(aq) → H2O(l) + O2(g) A. solid precipitate forming in a liquid B. no detectable change C. bubbles forming in a liquid D. color change in a liquid CO2(s) → CO2(g) is an example of A. a physical change. B. a chemical change. C. a combination reaction. D. a decomposition reaction. Which chemical equation represents a physical change? A. NaCl(aq) → H2O(g) + NaCl(s) B. 2Li(s) + 2H2O(l) → 2LiOH(s) + H2(g) C. 2CH3OH(l) + 3O2(g) → 2CO2(s) + 4H2O(g) D. 2H2(g) + O2(g) → 2H2O(g) Which 2 of these things can be classified as matter according to the definition of matter? Explain why. a. a thought b. a desk c. car exhaust An archeology student found a copper-colored coin at a dig. She determined that the mass of the coin is 5.24 g and its volume is 0.58 cm3. Is the coin copper? Explain your thinking. Describe what you would expect to see if you were to perform the following chemical reaction. Which 3 elements in the table below would you expect to find in the same group on the periodic table? Explain your thinking. What is the name of the piece of lab equipment shown here? (1 point) What do you expect to see inside the bottle shown here? (2 points) Use a periodic table to answer Questions 5. Is antimony (Sb) a metal, a nonmetal, or a metalloid? (1 point) What is the name of the piece of lab equipment shown at the right? (1 point) What do you expect to see inside the bottle shown here? (2 points) Use a periodic table to answer Questions 5. Is gallium (Ga) a metal, a nonmetal, or a metalloid? (1 point) Consider the following reaction between solid sodium cyanide (NaCN) and a solution of hydrochloric acid (HCl(aq)). Describe in detail what you would observe if you carried out this reaction. (2 points) Read more