- DB.A material safety data sheet (MSDS) for a chemical is shown below. Which of these is the IUPAC name for H3PO4(aq)?
- Elements in a group of the periodic table are described below. These elements most likely belong to which group?
- The graph below shows a solubility curve for ammonia gas and solubility measurements taken at different temperatures. Between which two points did the ammonia solution change from being unsaturated to saturated?
- How many atoms are present in 179.0 g of iridium?
- Heart cells require a certain balance of sodium and potassium ions to function. The blood, which is approximately 83% water, carries these two types of ions to the heart. The property of water that allows it to carry ions to the heart is its—
- Some students used a variety of procedures to investigate four liquid samples. The students recorded the following information. • When Sample W was cooled, solid particles settled out of the liquid. • The mass and volume of Sample X were measured, and the density of Sample X was calculated to be 1.6 g/mL. • Sample Y was heated, and the temperature was recorded. All the liquid boiled away at the same temperature and left no residue in the container. • When a dilute acid was added to Sample Z, gas bubbles formed and rapidly rose to the surface of the liquid.Based on these observations, which sample was clearly identifiable as a pure substance?
- The diagram below shows what happens when zinc reacts with hydrochloric acid. Which of these best describes the energy transformation that occurs during this reaction?
- When zinc is exposed to air, zinc oxide is produced. What happens in this reaction?
- The diagram below shows a battery giving off a current producing bubbles in two test tubes. Which of the following best shows that the investigation results in a chemical change?
- What is the electron configuration for an atom of germanium at ground state?
- What is the volume of 2.00 moles of chlorine (Cl2) at STP, to the nearest tenth of a liter?
- Which of the following correctly matches a compound with its molecular geometry?
- Which of these is the electron-dot diagram for Br2(l)?
- Which of these statements is an accurate description of the ionization energies of elements in the periodic table?
- Which mixture can be separated through filtration because one of the substances is insoluble in water?
- What is the pH of a substance that has a hydrogen ion concentration of 1.2 ×10−2 M?
- The table below lists some properties of a sample of lauric acid. Which of these is an intensive property of this sample?
- What is the formula of the ion hydrogen sulfite, which has a charge of −1?
- A detail from a label on a bottle of a water-softening agent is shown below. Which inference about the contents of the bottle can best be drawn?
- _________ s a liquid's resistance to flow.