IdeasCuriosas - Every Question Deserves an Answer Logo

Questions in chemistry

[Answered] Which is mostly methane? A. oil B. natural gas C. coal waste D. propane

[Answered] A chemical reaction is described by the following equation: [tex]2 K_2 O_{(s)} \rightarrow 4 K_{(s)}+O_{2(g)}[/tex] What type of reaction is this? Which of the statements below best describes this reaction? A. One compound breaks down into two or more substances. B. Two or more substances combine to form one compound. C. A hydrocarbon combines with oxygen to form carbon dioxide and water. D. One of the elements in a compound is replaced. E. Two compounds swap "partner" elements with each other.

[Answered] Given (i) [tex]$n=5, m_i=+1$[/tex] (ii) [tex]$n =2, \ell=1, m_{\ell}=-1, m_{ s }=-1 / 2$[/tex] The maximum number of electron(s) in an atom that can have the quantum numbers as given in (i) and (ii) are respectively: (a) 25 and 1 (b) 8 and 1 (c) 2 and 4 (d) 4 and 1

[Answered] What's the main difference between metallic and nonmetallic luster in minerals?

[Answered] A chemical reaction is described by the following equation: [tex]$Cl_{2(l)}+2 NaI_{(a q)} \rightarrow 2 NaCl_{(a q)}+I_{2(s)}$[/tex] What type of reaction is this? Which of the statements below best describes this reaction? A. One compound breaks down into two or more substances. B. Two or more substances combine to form one compound. C. A hydrocarbon combines with oxygen to form carbon dioxide and water. D. One of the elements in a compound is replaced. E. Two compounds swap "partner" elements with each other.

[Answered] How are cleavage and fracture of minerals different?

[Answered] Nitrates and sulfates in Earth's atmosphere create A. polar melting. B. acid rain. C. the greenhouse effect. D. equilibrium clouds.

[Answered] What volume of a 5% w/v solution is required to deliver a dose of 40mg?

[Answered] Name the following cyclic alkanes. a. b. c. d.

[Answered] Which solution will change red litmus to blue? A. HCl (aq.) B. NaCl (aq.) C. CH3OH (aq.) D. NaOH(aq.) 77. Given the equation: H+ + OH- = H2O, which type of reaction does the equation represent? A. Esterification B. Decomposition C. Hydrolysis D. Neutralization 78. Which of the following elements is essential in all organic compounds? A. Nitrogen B. Hydrogen C. Oxygen D. Carbon 79. Naturally occurring polymers are A. starch and nylon B. starch and cellulose C. protein and nylon D. protein and plastic 80. Which of the following compounds is represented by the general formula CnH2n-2? A. Butane B. Butene C. Butyne D. Benzene 81. Compared to the charge and mass of a proton, an electron has A. the same charge and a smaller mass B. the same charge and the same mass C. an opposite charge and a smaller mass D. an opposite charge and the same mass