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Questions in chemistry

[Answered] Will carbon and hydrogen atoms most likely form an ionic bond or a covalent bond?

[Answered] Which sample is a pure substance? A. zinc oxide B. sugar dissolved in water C. pond water D. soil

[Answered] Find the elements sulfur (S) and oxygen (O) on the periodic table, and then answer the following questions. Is sulfur a metal or a nonmetal? How many valence electrons does a sulfur atom have?

[Answered] Calculate the pH at $25^{\circ} C$ of a 0.36 M solution of ethylammonium bromide $\left( C _2 H _5 NH _3 Br \right)$. Note that ethylamine $\left( C _2 H _5 NH _2\right)$ is a weak base with a $p K_b$ of 3.19. Round your answer to 1 decimal place. $pH=$

[Answered] Which answer below correctly identifies the type of change and the explanation for the separation of the iron with sulfur? A. physical change because even though a color change occurred, each solid maintained its original properties, which could be seen as soon as the magnet was applied B. physical change because no temperature change was observed, which would be an indicator of chemical change C. chemical change because a color change was observed, which indicated that a new substance was formed D. chemical change because the results depended on the interaction of two substances

[Answered] Which of the following compounds are ionic compounds? Check all of the boxes that apply. $CaCl _2$ $C _6 H _{12} O _6$ MgO $Na _2 O$ $SiO _2$

[Answered] Which refers to a mixture that contains more than one phase in which the characteristics of the particles vary throughout the mixture? A. compound B. element C. heterogeneous D. homogeneous

[Answered] Select the correct answer. Which atom or ion is the largest? A. K+ B. K C. Ca D. Ca2+ E. Li

[Answered] Consider the nuclear equation below. ${ }_{66}^{222} Rn \longrightarrow{ }_7^{218} Po+{ }_2^4 He$ Which is the missing value that will balance the equation? A. 84 B. 86 C. 88 D. 90

[Answered] Select the correct answer. What is the solution to the problem expressed to the correct number of significant figures? [tex]$15.11+(142 \times 16.5)=?$ A. 2,358 B. [tex]$2,358.1$ C. 2,360 D. 2,400