Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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2.
Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which
of the following is the BEST evidence that a chemical reaction occurs when the coal
burns?
a. Production of
mechanical energy c. A new substance is produced
b. Production of electricity
d. Formation of precipitate
3.Which of these does NOT happen during a chemical change?
a. New substances are formed with different chemical properties.
b. Attractive force between atoms of molecule formed or break.
c. The chemical properties of the substances before and after the reaction are
the same
d. Energy is always released or absorbed.
4. A granular substance is added to a liquid. Which of the following would supply
evidence to propose a chemical change has taken place?
a. The granules dissolve completely.
c. The volume of the liquid increases.
b. The liquid gives off heat.
d. The granules become smaller.
5. Which of the following does NOT indicate a chemical change is occurring?
a.…
Which mixture can be separated into its components by adding water then filtration?
a. Potassium carbonate and sodium carbonate
b. Silver nitrate and potassium iodide
c. Barium sulphate and magnesium sulphate
d. Silver bromide and silver sulphite
4. How do you distinguish
a. Chemical properties from physical
properties
b. Distillation from filtration
С.
c. Solute from a solution
d. Mixture from a compound
е.
Atom from a molecule
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- hat do the coefficients of a balanced chemical equation tell us about the proportions in which atoms and molecules react on an individual (microscopic) basis?arrow_forwardCorrect the following statements.a. An element is a combination of two or more compounds.b. When a small amount of sugar is completely dissolved in water, a heterogeneous solution is formed.arrow_forwarda. If 1.00 g of aluminum hydroxide reacts with 3.00 g of sulfuric acid, what is the mass of water produced? b. Aluminum metal and manganese (IV) oxide react to produce aluminum oxide and manganese metal. What mass of manganese (IV) oxide reacts to produce 1.00 kg of manganese metal? c. Recreational vehicles use propane for cooking and heating. The combustion of propane and oxygen produces carbon dioxide and water. What mass of water is produced from the combustion of 10.0 g of propane, C3H8? Al(OH)3(s)+H2SO4(l)→Al2(SO4)3(aq)+H2O(l)arrow_forward
- 1. Homogeneous mixture(s) A. orange juice B. oil + vinegar C. household white vinegar D. salt + pepper E. 100% isopropanolarrow_forwardThe physical basis for life is the carbon atom. This atom a. is more abundant than silicon. b. is capable of forming long, complex, stable chains that extract, store, and use energy. c. can replicate itself in a variety of environments. d. releases energy when it bonds with other elements, thus providing the necessary requirements to sustain the organism. e. does all of the above.arrow_forward1. Define chemistry and explain how burning wood is related to chemistry. 2. Define energy and explain the importance of energy in chemistry.arrow_forward
- Evidence of a chemical reactions is anything that shows... A.a change in the state of matter B. interaction between 2 gases C. a new substance has formed D. a solid dissolved in a liquidarrow_forward2. Homogeneous mixtures(s) A. distilled water B. gasoline C. sandy water D. copper turnings + iron filings E. white gold (gold + palladium)arrow_forward
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