Question

if bacl2 and na2so4 solutions are mixed together, a
single displacement reaction occurs.
double displacement reaction occurs.
decomposition occurs.
synthesis reaction occurs.

acidic solutions have a ph that is lower than 7.
true
false

all metals are located on the right side of the periodic table.
true
false

what is the main consequence of melting polar ice caps?
increased rain fall
increasing sea level

Explanation:

• For the first question: In a double - displacement reaction, the positive and negative ions of two ionic compounds exchange partners. When \(BaCl_2\) and \(Na_2SO_4\) are mixed, \(Ba^{2 +}\) combines with \(SO_4^{2-}\) to form \(BaSO_4\) (a precipitate) and \(Na^{+}\) combines with \(Cl^{-}\) to form \(NaCl\). The general form of a double - displacement reaction is \(AB + CD

ightarrow AD+CB\), which is what happens here (\(BaCl_2+Na_2SO_4
ightarrow BaSO_4 + 2NaCl\)).

• For the second question: By definition, acidic solutions have a pH value less than 7. Solutions with pH = 7 are neutral, and solutions with pH>7 are basic.
• For the third question: Metals are mainly located on the left side and in the middle of the periodic table. Non - metals are on the right side.
• For the fourth question: Polar ice caps are large masses of ice. When they melt, the volume of water in the oceans increases, leading to an increase in sea level. Rainfall is more related to factors like evaporation, condensation in the water cycle, and weather systems. Earthquakes are related to tectonic plate movements.

Answer:

• First question: double displacement reaction occurs.
• Second question: True.
• Third question: False.
• Fourth question: increasing sea level.