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Questions in chemistry

[Terjawab] Add or subtract the following measurements. Be sure each answer you enter contains the correct number of significant digits. [tex] \begin{aligned} 14.6 mL+15.50 mL & =\square mL \\ 15.61 mL-5.5 mL & =\square mL \\ 3.520 mL+18.8 mL & =\square mL \end{aligned} [/tex]

[Terjawab] Complete the table below. For example, in the first row decide whether [tex]$Sc ^{3+}$[/tex] is a cation or anion. In the second row, write the symbol for the ion that an atom of potassium is mostly likely to form and then decide what type of ion it is. | element | most likely ion | |---|---| | | symbol of ion | type of ion | | scandium | [tex]$Sc ^{3+}$[/tex] | | | potassium | | cation | | oxygen | | cation | | barium | | cation | | chlorine | | cation anion

[Terjawab] Experiments were done on a certain pure substance [tex]$X$[/tex] to determine some of its properties. There's a description of each experiment. In each case, decide whether the property measured was a chemical or physical property of [tex]$X$[/tex], if you can. If you don't have enough information, choose 'can't decide' in the third column. | property | experiment | physical or chemical? | |---|---|---| | D | A sample of [tex]$X$[/tex] is carefully weighed and put inside a vented flask. Water is added to the flask until it just covers the sample, and the volume of sample and water is recorded. Then the sample is removed and the volume of water alone recorded. From the mass of the sample and the difference in volumes, the value of [tex]$D$[/tex] may be calculated. | physical chemical (can't decide) | | 0 | A sample of solid [tex]$X$[/tex] is carefully weighed and put inside a vented flask. The flask is heated until oxygen gas starts being produced. After no more oxygen gas is produced, the contents of the flask are removed and weighed, and from the decrease in weight the value of [tex]$O$[/tex] may be calculated. | physical chemical (can't decide) | | C | A sample of [tex]$X$[/tex] is carefully weighed and put inside a sealed calorimeter. Pure oxygen gas is injected into the calorimeter, and the mixture ignited. After all of [tex]$X$[/tex] has reacted with the oxygen gas, the temperature rise of the calorimeter is measured. From this change in temperature the value of [tex]$C$[/tex] may be calculated. | physical chemical (can't decide) |

[Terjawab] $33.6 \text{ g}$ of $N_2$ and 24 g of $H_2$ are placed in a $5 \text{ dm}^3$ sealed container and react according to the following balanced equation until dynamic equilibrium is reached. $N_2(g)+3 H_2(g) \rightleftharpoons 2 NH_3(g)$ 6.1 Explain the term "dynamic chemical equilibrium" At 573 K when equilibrium is reached, there is $5.6 \text{ g}$ of $N_2$ gas left inside the container. 6.2 Calculate the concentration of both reactants when the reaction reached equilibrium for the first time. 6.3 Calculate the equilibrium constant $(K_c)$ when this reaction reached equilibrium. 6.4 How would the yield of $NH_3$ change if a smaller container than the $5 \text{ dm}^3$ is used? Write only INCREASES, DECREASES or REMAINS THE SAME. The temperature of this reaction increases from 573 K to 700 K. At this new temperature the equilibrium constant for this reaction decreases. 6.5 Is the forward reaction endothermic or exothermic? 6.6 Explain your answer to QUESTION 6.5.

[Terjawab] Which element will have the smallest atomic radius? nitrogen (N) arsenic (As) antimony (Sb) phosphorus (P)

[Terjawab] Which element will have the largest atomic radius? potassium (K) germanium (Ge) calcium (Ca) gallium (Ga)

[Terjawab] Correct Add or subtract the following measurements. Be sure each answer you enter contains the correct number of significant figures. [tex]\begin{aligned} 14.6 mL+15.50 mL & =30.1 mL \\ 15.61 mL-5.5 mL & =10.1 mL \\ 3.520 mL+18.8 mL & =22.3 mL \end{aligned}[/tex]

[Terjawab] Fill in the name and empirical formula of each ionic compound that could be formed from the ions in | cation | anion | empirical formula | name of compound | |---|---|---|---| | [tex]$K ^{+}$[/tex] | [tex]$ClO _3^{-}$[/tex] | | | | [tex]$Na ^{+}$[/tex] | [tex]$ClO _4^{-}$[/tex] | | | | [tex]$Na ^{+}$[/tex] | [tex]$ClO _3^{-}$[/tex] | | |

[Terjawab] Which is another name for groups of elements? A. actinides B. families C. halogens D. periods.

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?