Concept explainers
Videos
(a)
Interpretation:
The given statement has to be identified as observation, hypothesis, theory, or scientific law.
The given statement is,
The battery in my watch must be dead since it is no longer keeping time.
Concept introduction:
Hypothesis:
A hypothesis is a reasonable guess based on the limited data which acts as a foundation for the further investigation. A hypothesis is not tested and proven scientifically and the results are uncertain and it relies on the possibility.
Theory:
A theory is a well correct explanation of a natural phenomenon that is validated through observation and experimentation and it is based on wide range of data. A theory is tested and proven scientifically, the results are certain, and it relies on evidence.
Scientific law:
A scientific law is the description of an observed fact. It does not explain why the observable fact exists or what causes it.
Example:
A scientific law predicts the results of unborn child’s possible hair colors or how far a baseball travels when launched at a certain angle.
Observation:
An observation is the act of noticing something or judgment from something seen or experienced.
(b)
Interpretation:
The given statement has to be identified as observation, hypothesis, theory, or scientific law.
The given statement is,
My computer must have virus since it is not working properly.
Concept introduction:
Refer to part (a).
(c)
Interpretation:
The given statement has to be identified as observation, hypothesis, theory, or scientific law.
The given statement is,
The air feels cool.
Concept introduction:
Refer to part (a).
(d)
Interpretation:
The given statement has to be identified as observation, hypothesis, theory, or scientific law.
The given statement is,
The candle burns more brightly in pure oxygen that in air because supports combustion.
Concept introduction:
Refer to part (a).
(e)
Interpretation:
The given statement has to be identified as observation, hypothesis, theory, or scientific law.
The given statement is,
My sister wears red quite often.
Concept introduction:
Refer to part (a).
(f)
Interpretation:
The given statement has to be identified as observation, hypothesis, theory, or scientific law.
The given statement is,
A pure substance has a definite, fixed composition.
Concept introduction:
Refer to part (a).
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Chapter 1 Solutions
EBK FOUNDATIONS OF COLLEGE CHEMISTRY
- For which Group 2 metal (M), is this process the most exothermic? M2+(g) + O2−(g) + CO2(g) → MO(s) + CO2(g) Group of answer choices M = Sr M = Mg M = Ca M = Baarrow_forward2. Specify the solvent and reagent(s) required to carry out each of the following FGI. If two reagent sets must be used for the FGI, specify the solvent and reagent(s) for each reagent set. If a reaction cannot be carried out with reagents (sets) class, write NP (not possible) in the solvent box for reagent set #1. Use the letter abbreviation for each solvent; use a number abbreviation for reagent(s). Solvents: CH2Cl2 (A); H₂O (B); Reagents: HBr (1); H2SO4 (2); CH3OH (C); Br₂ (3); CH3CO₂H (D) NaHCO3 (4); Hg(OAc)2 (5); R₂BH (6); H₂O₂ / HO- (7); NaBH4 (8) Reagent Set #1 Reagent Set #2 FGI Solvent Reagent(s) Solvent Reagent(s) HO OHarrow_forwardFor which of the following ionic compounds would you expect the smallest difference between its theoretical and experimental lattice enthalpies? (You may assume these all have the same unit cell structure.) Electronegativities: Ca (1.0), Fe (1.8), Mg (1.2), O (3.5), S (2.5), Zn (1.6) Group of answer choices ZnO MgS CaO FeSarrow_forward
- In the Born-Haber cycle for KCl crystal formation, what enthalpy component must be divided by two? Group of answer choices KCl(s) enthalpy of formation Ionization energy for K(g) K(s) sublimation enthalpy Cl2 bond dissociation enthalpyarrow_forward2. Specify the solvent and reagent(s) required to carry out each of the following FGI. If two reagent sets must be used for the FGI, specify the solvent and reagent(s) for each reagent set. If a reaction cannot be carried out with reagents (sets) class, write NP (not possible) in the solvent box for reagent set #1. Use the letter abbreviation for each solvent; use a number abbreviation for reagent(s). Solvents: CH2Cl2 (A); H₂O (B); Reagents: HBr (1); R₂BH (6); H2SO4 (2); CH3OH (C); Br₂ (3); CH3CO₂H (D) NaHCO3 (4); Hg(OAc)2 (5); H₂O₂ / HO (7); NaBH4 (8) Reagent Set #1 Reagent Set #2 FGI хот Br Solvent Reagent(s) Solvent Reagent(s)arrow_forwardWhat is the correct chemical equation for the lattice formation reaction for CaBr2? Group of answer choices Ca2+(g) + 2 Br−(g) → CaBr2(s) ½ Ca2+(g) + Br−(g) → ½ CaBr2(s) Ca(s) + Br2(l) → CaBr2(s) Ca(s) + 2 Br−(g) → CaBr2(s)arrow_forward
- PLEASE ANSWER THE QUESTION!!!arrow_forward3. SYNTHESIS. Propose a sequence of synthetic steps (FGI) that convert the starting material (SM) into the Target molecule. For each FGI in your proposed synthesis, specify the reagents / conditions, and draw the product(s) of that FGI. DO NOT INCLUDE the FGI mxn in the answer you submit. If an FGI requires two reagent sets, specify the order in which the reagent sets are added, e.g., i) Hg(OAc)2 / H₂O; ii) NaBH4/MeOH. Indicate the stereochemistry (if any) of the products of each FGI. FGI 1. Me Starting Material Source of all carbons in the Target molecule (can use multiple copies) Me Me Target molecule + enantiomerarrow_forwardcurved arrows are used to illustate the flow of electrons. Using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction mechanism stepsarrow_forward
Introductory Chemistry: A FoundationChemistryISBN:9781337399425Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage Learning