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Questions in chemistry

[Homework Help] Which is classified as an inner transition element? A. calcium B. copper C. fermium D. helium

[Homework Help] How many molecules of SF6 are in [tex]$25.0 g SF _6$[/tex]? ([tex]$1 mol SF _6=146.06 g$[/tex]) ([tex]$1 mol SF _6=6.02 \times 10^{23}$[/tex] molecules) [?] [tex]$\times 10^{[?]}$[/tex] molecules [tex]$SF _6$[/tex] Enter the coefficient and the exponent.

[Homework Help] How is hydronium ion $H_3O^+$ formed?

[Homework Help] Which statement describes an electron? A. It has a positive charge and is located in the nucleus. B. It has a positive charge and is located in orbitals around the nucleus. C. It has a negative charge and is located in the nucleus. D. It has a negative charge and is located in orbitals around the nucleus.

[Homework Help] Which of the following is a chemical property? mass flammability melting point volume temperature

[Homework Help] The very first surfactants were A. cooking oils B. motor oils C. nail polishes D. soaps

[Homework Help] 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]

[Homework Help] 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?

[Homework Help] 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)

[Homework Help] $2 AgNO _3( aq )+ K _2 SO _4( aq ) \rightarrow 2 KNO _3( aq )+ Ag _2 SO _4(s)$ 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.