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Questions in chemistry

[Terjawab] Sodium carbonate is a basic salt because it is a salt of: A. strong acid and strong base B. weak acid and weak base C. strong acid and weak base D. weak acid and strong base

[Terjawab] Consider the chemical equation in equilibrium: [tex]2 H_2(g)+O_2(g) \Leftrightarrow 2 H_2 O(g)[/tex] What will happen if the pressure of the system is increased? A. The reaction will not change. B. The reaction will stop completely.

[Terjawab] Based on the information in the table, which elements are most likely in the same periods of the periodic table? | Element | Atomic mass (amu) | Total electrons | Valence electrons | Year isolated | | -------------- | ----------------- | --------------- | ----------------- | ------------- | | Aluminum (AI) | 27 | 13 | 3 | 1825 | | Boron (B) | 11 | 5 | 3 | 1808 | | Carbon (C) | 12 | 6 | 4 | 1803 | | Gallium (Ga) | 70 | 31 | 3 | 1875 | | Germanium (Ge) | 73 | 32 | 4 | 1886 | A. Boron and carbon are likely together in one period because they have very close atomic masses, while gallium and germanium are likely together in another period because they have very close atomic masses. B. Aluminum, boron, and carbon are likely together in one period because they were first isolated in the first half of the 1800s, while gallium and germanium are likely together in another period because they were first isolated in the second half. C. Boron and carbon are likely together in one period because they each end in "-on," while aluminum, gallium, and germanium are likely together in another period because they each end in "-ium." D. Aluminum, boron, and gallium are likely together in one group because they have the same number of valence

[Terjawab] Considering the activity series given for nonmetals, what is the result of the below reaction? Use the activity series provided. [tex]F > Cl > Br > I[/tex] [tex]Br_2+NaF \rightarrow[/tex] A. no reaction B. [tex]Na + FBr _2[/tex] C. [tex]NaBr + F _2[/tex] D. [tex]Na _2 F+ Br _2[/tex]

[Terjawab] To produce foamed plastics like Styrofoam, as a propellant in spray cans, and as a refrigerant in air conditioners and refrigerators: A. Ozone gas has been used B. Chlorofluorocarbons have been used C. Carbon dioxide has been used D. Hydrofluorocarbons have been used

[Terjawab] Which process is a chemical change? A. burning a match B. boiling water C. melting ice D. breaking glass

[Terjawab] A student takes a measured volume of 3.00 M HCl to prepare a 50.0 mL sample of 1.80 M HCl. What volume of 3.00 M HCl did the student use to make the sample? Use [tex]M_i V_i=M_f V_f[/tex]. A. 3.70 mL B. 16.7 mL C. 30.0 mL D. 83.3 mL

[Terjawab] Identify the base in this acid-base reaction: [tex]2 HC_2 H_3 O_2+Mg(OH)_2 \rightarrow Mg\left(C_2 H_3 O_2\right)_2+2 H_2 O[/tex] A. [tex]HC _2 H _3 O _2[/tex] B. [tex]Mg ( OH )_2[/tex] C. [tex]Mg \left( C _2 H _3 O _2\right)_2[/tex] D. [tex]H _2 O[/tex]

[Terjawab] Propane burns in air to produce carbon dioxide and water. What is this type of chemical reaction called? A. synthesis B. combustion C. decomposition D. single replacement

[Terjawab] Which of the following is the most suitable requirement for the dehydration of ethanol to form an ether? A. Sodium hydroxide at 443K B. Sulphuric acid at 443K C. Sulphuric acid at 413K D. Sodium hydroxide at 413K