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Questions in chemistry

[Terjawab] Is magnesium a metal or a nonmetal? How many valence electrons does a magnesium atom have?

[Terjawab] $Ca(OH)_2(aq) + 2HNO_3(aq) \rightarrow 2H_2O(l) + Ca(NO_3)_2(aq)$ Is this reaction a: A. precipitation B. acid-base neutralization C. redox reaction

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

[Terjawab] When 40.0 mL of $1.00 M H _2 SO _4$ is added to 80.0 mL of 1.00 M NaOH at $20.00^{\circ} C$ in a coffee cup calorimeter, the temperature of the aqueous solution increases to $29.20^{\circ} C$. If the mass of the solution is 120.0 g and the specific heat of the calorimeter and solution is $4.184 J / g \cdot{ }^{\circ} C$, how much heat is given off in the reaction? (Ignore the mass of the calorimeter in the calculation.) Use $q=m C_p \Delta T$. A. 4.62 kJ B. 10.0 kJ C. 14.7 kJ D. 38.5 kJ

[Terjawab] Which of the following BEST illustrates a primary air pollutant? A. Carbon dioxide released from the burning of coal. B. Sulfur trioxide produced when sulfur dioxide reacts with oxygen in the air. C. Ozone produced in photochemical smog. D. Carbon dioxide released through photosynthesis.

[Terjawab] Which is the electron configuration for bromine? A. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^{10} 4 p^5$ B. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^{10} 4 p^6$ C. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^4 4 s^2 3 d^{10} 4 p^5$ D. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^9 4 p^5$

[Terjawab] Which substances were ionic? A. Oil B. Cornstarch C. Sodium Chloride D. Sodium Bicarbonate

[Terjawab] Which compound is an exception to the octet rule? $H _2 O$ HCl $CCl _4$ $ClF _3$

[Terjawab] A scientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas. Which group of statements best describes all of the materials he is using in the investigation? A. They are each compounds. Each of the compounds is made of atoms. All of the atoms are made of matter. B. They are each made of matter. Some are compounds and some are elements. They all contain atoms. C. They are all elements. Some contain molecules of the same type of atom. Some contain different types of atoms. D. They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.

[Terjawab] What is a rate law? A. An equation that relates the concentrations of reactants to the rate constant B. An equation that relates the rate constant to the temperature of a reaction C. An equation that relates the rate of a reaction to the equilibrium position D. An equation that relates the reaction rate to the concentrations of the reactants