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Questions in chemistry

[Answered] What effect does temperature have on reaction rate? A. An increase in temperature slows the reaction down. B. An increase in temperature does not change the reaction rate. C. An increase in temperature speeds up the reaction rate. D. An increase in temperature keeps the reaction from stopping.

[Answered] Write the position of Sodium in the modern periodic table. Why is it known as alkali metal?

[Answered] Which of the following can easily form an ionic bond with a cation? Sr Ne [tex]$NH _4{ }^{+}$[/tex] [tex]$PO _4{ }^{3-}$[/tex]

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

[Answered] The molar mass of NaOH is $40.00 g / mol$. If 5.20 g NaOH are dissolved in 0.500 L of solution, what is the molarity of the solution? Use molarity $=\frac{\text { moles of solute }}{\text { liters of solution }}$. A. 0.0125 M B. 0.260 M C. 3.85 M D. 7.69 M

[Answered] What period is F (fluorine) in? A. 17 B. 7 A C. 7 B D. 2

[Answered] Which is a characteristic of mixtures? A. They are chemically bonded together. B. They can be classified as pure substances. C. They have fixed ratios between their components. D. They can be separated by physical processes.

[Answered] Which is a strong base? HCl NaOH [tex]$NH _3$[/tex] [tex]$H _3 CO _3$[/tex]

[Answered] For the isotope ${ }^{71} Ga , Z =$ $\qquad$ and $A =$ $\qquad$ A. 31; 40 B. $31 ; 69.723$ C. 71; 31 D. $71 ; 40$ E. 31; 71

[Answered] What information does an energy diagram give? A. It shows the rate of the reaction as a function of time. B. It shows the transfer of potential energy to kinetic energy. C. It shows the energy requirements needed in order for a reaction to occur. D. It shows how concentrations of reactants affect the energy.