(a)
Interpretation:
Hot tea has to be classified as a compound or an element.
Concept Introduction:
Pure substance: A single component that has a constant composition, irrespective of the
Example: Water, sugar etc.
A pure substance can be classified into an element and a compound.
Element: A pure substance, which cannot be broken down into smaller substances by a
Example: Hydrogen gas, Magnesium ribbon and copper wire etc.
Compound: A pure substance that is formed by combination of two or more elements by chemical process is called as a compound. Example: Sodium chloride is a compound because it is formed from elements sodium and chlorine.
(b)
Interpretation:
Beach sand has to be classified as an element or a compound.
Concept Introduction:
Refer to part (a).
(c)
Interpretation:
Carbon dioxide has to be classified as a compound or an element.
Concept Introduction:
Refer to part (a).
(d)
Interpretation:
Cement has to be classified as an element or a compound.
Concept Introduction:
Refer to part (a).
(e)
Interpretation:
Zinc has to be classified as an element or a compound.
Concept Introduction:
Refer to part (a).
(f)
Interpretation:
Vinegar has to be classified as an element or a compound.
Concept Introduction:
Refer to part (a).
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EBK FOUNDATIONS OF COLLEGE CHEMISTRY
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- Which of the following are elements, which aremolecules but not compounds, which are compoundsbut not molecules, and which are both compounds andmolecules? (a) SO2, (b) S8, (c) Cs, (d) N2O5, (e) O,(f) O2, (g) O3, (h) CH4, (i) KBr, (j) S, (k) P4, (l) LiF.arrow_forwardGive the chemical formula for each of the following ionic compounds:(a) sodium phosphate, (b) zinc nitrate, (c) bariumbromate, (d) iron(II) perchlorate, (e) cobalt(II) hydrogen carbonate,(f) chromium(III) acetate, (g) potassium dichromatearrow_forward(b) Complete the sentences by crossing out the words that are wrong. The first one has been done for you. Nan-Metals Metals can be hammered into shape. Non-Metals Metals often have low melting point. Non-Metals Metals are good conductors of heat.arrow_forward
- Classify each of the following as a compound, a homogeneous mixture, or a heterogeneous mixture: (a) distilled water; (b) gasoline; (c) beach sand; (d) wine; (e) air.arrow_forwardhydrochloric acid + magnesium → hydrogen gas + magnesium chloride List two physical / chemical properties for each compound.arrow_forwardUse the box color(s) in the periodic table below to identify the element(s) described by each of the following: (a) Four elements that are nonmetals (b) Two elements that are metals (c) Three elements that are gases at room temperaturearrow_forward
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