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Questions in chemistry

[Terjawab] Which type of bond is found in many carbon-to-carbon bonds in canola oil, but very few carbon-to-carbon bonds in butter? A. [tex]$C - C$[/tex] B. [tex]$C = C$[/tex] C. [tex]$C = H$[/tex]

[Terjawab] Find the elements carbon (C) and hydrogen (H) on the periodic table, and answer the following questions. Is carbon a metal or a nonmetal? How many valence electrons does a carbon atom have?

[Terjawab] 1. a) State two characteristics of the following kingdoms: (i) Kingdom Protoctista ii. Kingdom Animalia iii. Kingdom Plantae (6 marks) (b) i. Define the term ions. (2 marks) ii. Give four (4) differences between temperature and heat. (4 marks) (d) Explain the following with examples: i. First class lever ii. Second class lever iii. Third class lever (6 marks) 2. a) i. Define ionic bond and give two examples. (3 marks) ii. Write four (4) differences between mass and weight. (4 marks) (b) Write the IUPAC name for each of the following compounds: (i) Ca(OH)2 (ii) ZnCO3 (iii) MnO2-4 (iv) H2SO4 (v) SO4²- (vi) Fe(OH)2 (6 marks) (c) (i) Define concentration of a solution. (3 marks)

[Terjawab] $2 AgNO _3( aq )+ K _2 SO _4( aq ) \rightarrow 2 KNO _3( aq )+ Ag _2 SO _4(s)$ The spectator ions in the reaction shown are: A. silver ion and sulfate ion. B. potassium ion and nitrate ion. C. silver ion and nitrate ion. D. hydrogen ion and hydroxide ion. E. potassium ion and sulfate ion.

[Terjawab] What is the mass of $2.01 \times 10^{23}$ formula units of $CoSO_4$? ($1 mol CoSO_4 = 154.99 g$) ($1 mol CoSO_4 = 6.02 \times 10^{23}$ formula units) [?] g $CoSO_4$

[Terjawab] What is the molarity of 6 moles $(mol)$ of NaCl dissolved in 2 L of water? A. $\frac{6 mol}{2 L}$ B. $\frac{6 L}{2 mol}$ C. $\frac{2 L}{6 mol}$ D. $\frac{2 mol}{6 L}$

[Terjawab] Use the periodic table to write the electron configuration of selenium (Se). Place the sublevels in order of filling from least energy to most energy.

[Terjawab] Which of the following gases must be dissolved in a solvent in order to be stored safely in a cylinder? A. Oxygen B. Propane C. Acetylene D. Carbon monoxide E. Both C and D are correct.

[Terjawab] Is hydrogen a metal or a nonmetal? How many valence electrons does a hydrogen atom have? Will carbon and hydrogen atoms most likely form an ionic bond or a covalent bond?

[Terjawab] How many formula units (f.un.) are in [tex]$35.0 g KNO_3$[/tex]? ([tex]$1 mol KNO_3=101.11 g$[/tex]) ([tex]$1 mol KNO_3=6.02 \times 10^{23}$[/tex] formula units) [?] [tex]$\times 10^{[?]} \text { f.un. } KNO_3$[/tex] Enter the coefficient in the green box and the exponent in the yellow box.