Classify each property as physical or chemical. (a) the tendency for platinum jewelry to scratch easily(b) the ability of sulfuric acid to burn the skin(c) the ability of hydrogen peroxide to bleach hair(d) the density of lead relative to other metals

The gasoline tank of an automobile contains 49.0 kg of gasoline. The gasoline combines with 196 kg of oxygen. What is the total combined mass of the carbon dioxide and water produced by combustion in the engine?

The diagram in (a) shows a compound made up of atoms of two elements (represented by the green and red spheres) in the liquid state.Which of the diagrams in (b) to (d) represent a physical change, and which diagrams represent a chemical change?

Which of the following processes is a physical change? (a) evaporation of water; (b) combination ofhydrogen and oxygen gas to produce water; (c) dissolution of sugar in water; (d) separation of sodium chloride (table salt) into its constituentelements, sodium and chlorine; (e) combustion of sugar to produce carbon dioxide and water.

5. Identify the following as a physical or chemical change: (a) water boils at 212 °F (b) applying an electric current to water causing the evolution of a gas (c) some metal statues obtain a green color after years of exposure to the atmosphere (d) evaporation of water from a saline solution leaves a solid salt residue

A chemistry student must write down in her lab notebook the concentration of a solution of potassium chloride. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: • The label on the graduated cylinder says: empty weight: 1.55 g • She put some solid potassium chloride into the graduated cylinder and weighed it. With the potassium chloride added, the cylinder weighed 31.436 g. • She added water to the graduated cylinder and dissolved the potassium chloride completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 166.4 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. -1 g.mL x10 × Ś

Elemental bromine is a dense, dark red, strong-smelling liquid. Are these characteristics of elemental bromine physical or chemical properties?

Which of the following statements is FALSE? The mass percentage of calcium in calcium phosphate is an extensive property. Mixtures can be separated into substances by physical methods. O Density is an intensive property. O Separations of a solid from a liquid by filtration is an example of a physical process. O The mass percentage of calcium in calcium phosphate is an extensive property.

Mixtures are created by physical means (mixing a substance with another; no chemical bonding); if so, can they be separated only by physical means?

The SI unit for energy is the joule (J), which is equal to the kineticenergy possessed by a 2.00-kg mass moving at 1.00 m/s. Convertthis velocity to mph (1 mi = 1.609 km).(a) 4.47 × 10–7 mph (b) 5.79 × 106 mph (c) 5.79 mph (d) 0.0373 mph (e) 2.24 mph