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- What is an element? A. A substance that can be separated by physical means B. A substance that cannot be broken into simpler substances C. A substance that is made using a chemical reaction D. A substance that is made from two different metalsIron and oxygen react chemically to form rust. What kind of substance is rust? A. Element B. Compound C. Alloy D. MixtureI. Broken glassware can be disposed of into the general waste trash bin. II. General waste includes papers and plastic bottles. A. First statement is true and second statement is false B. First statement is false and second statement is true C. Both statements are incorrect D. Both statements are correct I. Halogenated waste should be separated from non-halogenated wastes II. These wastes are placed in a blohazard bag. A. First statement is true and second statement is false B. First statement is false and second statement is true C. Both statements are incorrect D. Both statements are correct
- Extensive properties of matter are A. depend on the energy the substance possesses. B. depend on the amount of a substance present in the sample. C. are independent of the amount of a substance that is present. D. are independent on the type of substance required. OE. depend on the way a substance behaves.7. What is a pure substance that is only made of type of atom? A. Element C. Compound D. Elixir B. Suspension What is a molecule that is made of atoms of two or more elements chemically 8. bonded together? A. Heterogeneous B. Heteronuclear C. Homogeneous D. Homonuclear 9. Which best describes heterogeneous mixtures? A. They must always be made of liquid components. No gas or solid components. B. The components must always be mixed or dispersed uniformly within the same physical state. C. The components are always visible and distinguishable from the other components. D. All of the options are correct. 10 Which best describes a homogenous mixture? A. They must always be made of liquid components. No gas or solid components. B. The components must always be mixed or dispersed uniformly within the same physical state. C. The components are always visible and distinguishable from the other components. D. All of the options are correct. 11 Which method would be the most effect to separate…1. Iron metal rusts in an atmosphere of moist air. a. Physical Propertyb. Chemical Property 2. Mercury metal is a liquid at room temperature.a. Physical Propertyb. Chemical Property3. Silver salts discolor the skin by reacting with skin protein.a. Physical Propertyb. Chemical Property4. Nickel metal dissolves in acid to produce a light green solutiona. Physical Propertyb. Chemical Property 5. Potassium metal has a melting point of 63°C.a. Physical Propertyb. Chemical Property6. Titanium metal can be drawn into thin wires.a. Physical Propertyb. Chemical Property7. Silver metal shows no sign of reaction when placed in hydrochloric acid.a. Physical Propertyb. Chemical Property8. Copper metal possesses a reddish-brown color.a. Physical Propertyb. Chemical Property9. Beryllium metal, when inhaled in a finely divided form, can produce serious lung disease.a. Physical Propertyb. Chemical Property
- A homogeneous mixture of two or more substances is called ________ a. a mess. b. a solution. c. an electrolyte. d. a solvent. e. a compound.A physical change occurs when a a. silver bowl tarnishes. b. glue gun melts a glue stick. c. peach spoils. d. bracelet turns your wrist green.1. What pieces of apparatus or equipment are used for measuring: a. Temperature? b. Small amount of liquids? c. Large amount of liquids? d. Mass of a substance? 2. Suggest ways on how to store and handle properly the different glassware to avoid accidents in the laboratory. You can use illustrations to show your idea. 3. Why is the most of the containers of substances and those used for heating are made up of glass rather than metal? 4. Explain why the thermometer should not be shaken rigorously to lower the reading to zero before using it.
- 2) Which of the following is intensive property? A. The amount of energy produced upon burning gasoline. B. The cost of gasoline. C. The temperature at which ice melts. D. The air pressure in a tire. E. The humidity of the atmosphere.14. It determines the phase of a substance. A. its pressure and temperature B. its mass and volume C. its mass D. its kindWhich statement is true about the particles of a solid when the solid changes into a liquid? A. They stop vibrating. B. Their kinetic energy increases. C. They move closer to each other. D. The attractive force between them increases