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Questions in chemistry

[Homework Help] 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.

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

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

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

[Homework Help] 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

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

[Homework Help] 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.

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

[Homework Help] 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

[Homework Help] 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.