Sci 9 Sem 2-1 SG

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct

The blue numbers in the image below represent ________

• I don't know, and don't want to try
• coefficients
• subscripts
• none of the answers are correct

The substances at the beginning of a chemical equation are called the ____

• product
• yield
• chemical symbol
• reactants

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

In a chemical reaction, everything to the rightof the arrow is called ______________.

• Products
• Yields
• Molecules
• Reactants

Balance this equation.

_CF₄ + _Br₂ -- _CBr₄ + _F₂

• 2,1,2,1 anionic single displacement

• 1,2,2,1 synthesis

• 1,2,1,2 anionic single displacement

• 2,2,2,2 cationic single displacement

Which coefficients balance this equation:
NH₃  +  O₂ ---->   NO  + H₂O

• 2,3,5,6
• 5,5,4,6
• 4,6,4,5
• 4,5,4,6

Balance this equation.

_CH₄ + _O₂ --> _CO₂ + _H₂O

• 1,2,1,1 single displacement

• 2,1,2,1 double displacement

• 1,2,1,2 hydrocarbon combustion

• 0,2,0,2 double displacement

Balance this equation-

_SeCl₆+_O₂ ->_SeO₂+_Cl₂

• 1,2,1,2 anionic single displacement

• 1,1,1,3 anionic single displacement

• 1,2,1,1 cationic single displacement

• 2,1,1,1 double displacement

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2, 6, 3, 2 , cationic single displacement

• it is already balanced

• 4, 12, 3, 4, anionic single displacement

• 2, 1, 4, 5 double displacement