Answer:12.5
Explanation: Divide 50$ by the 4 hours and you will get 12.5 which is $12.50.
Answer:
look at the graph
Explanation:
We know that as temperature increases, solubility increases.So, when there is a rise in temperature, as more solute become dissolved, the saturation point will be lifted and more amount of solute will be needed to reach saturation.
Here, when the temperature was 20oC, 38 g of salt was needed for saturation. As the temperature is increased by 15oC, at 35oC more amount of salt was needed to reach saturation(45g). So a 15oC rise in temperature caused a 7 g rise in the amount of salt needed for saturation. So, if temperature is increased additionally through 10oC, an approximate 4.5 g of salt will be needed more to reach the saturation. That is at 45oC, the amount of salt at saturation will be approximately 49.5 g.
So, the temperature and solubility as well as temperature and amount of salt at saturation are linearly related(directly proportional)
Answer: option 2.
K2SO4 (aq) + BaCl2 (aq) → 2 KCl (aq) + BaSO4 (s)
Explanation:
<u>Answer:</u>
<em>A solution that has fewer neutrons than protons and more electrons than protons is a negative ion.
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<u>Explanation:</u>
<em>Atoms in their original state have equal number of protons and electrons. The subatomic particles that take part in reaction are electrons.</em> When the electrons of an atom involve in a reaction an atom may lose or gain electrons and reach ionic state.
Ions can be positively charged or negatively charged and the charge acquired depends on whether electrons are gained or lost. The process of <em>losing electrons make an atom a positively charged ion and gaining electrons make an atom a negatively charged ion. </em>
<em>In this case the number of electrons is more than the number of protons which means there is an excess of negative charge and the atom has become a negatively charged ion.
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