CHEMISTRY HIGH SCHOOL

An atom that is electrically neutral containsa. more electrons than protons.
b. more neutrons than electrons.
c. an equal number of neutrons and protons.
d. an equal number of protons and electrons.

Answers

Answer 1
Answer: D. I wouldn't bother much with B and C since neutron doesn't necessarily has to be in the picture. So, why D? reasons being, an atom will not be electrically neutral if it exists as an ion. In other words, the no. of electrons have to be the same with the no. of protons.

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Drag each tile into the correct box. This pie chart gives information on US sources of greenhouse gas emissions by economic sector in 2013. Based on the data, arrange the activities in decreasing order of their contribution to climate change. Commercial and Residential Agriculture  Transportation Industry Electricity

Answers

Electricity

Industry

Transportation

Commercial and Residential

Agriculture

If you change the number of an atom has, it becomes a different element. If you change the number of it has, it becomes a different isotope.

Answers

Answer:

If you change the number of protons an atom has, it becomes a different element. If you change the number of nutrons it has, it becomes a different isotope.

Explanation:

Calculate the number of grams of CH_3COOH in the vinegar.

Answers

when density in g/ml
9.86ml CH3COOH (X g/1ml) = g
1.049g/ml
9.86ml (1.049g/1ml) = 10.343 g
hope it helps

How many grams of aluminum chloride are needed to react completely with 1.084g lithium sulfide?

Answers

Molar mass :

Li₂S = 45.947 g/mol

AlCl₃ = 133.34 g/mol

3 Li₂S + 2 AlCl₃ = 6 LiCl + Al₂S₃

3 * 45.947 g Li₂S ----------> 2 * 133.34 g AlCl₃
1.084 g Li₂S ----------------> ?

Mass Li₂S = 1.084 * 2 * 133.34 / 3 * 45.947

Mass Li₂S = 289.08112 / 137.841

Mass Li₂S = 2.0972 g 

hope this helps!

Consider the following generic chemical equation:A + B → C + D

Reactant A contains 85.1 J of chemical energy. Reactant B contains 87.9 J of chemical energy. Product C contains 38.7 J of chemical energy. If the reaction absorbs 104.3 J of chemical energy as it proceeds, how much chemical energy must product D contain? Explain your answer.

Answers

Answer:  238.6 J

Explanation:

According to the law of conservation of energy, energy can neither be created nor be destroyed. It can only be transformed from one form to another.

Endothermic reactions are those in which heat is absorbed by the system and thus the energy of products is higher than the energy of reactants.

For the given reaction:

A+B+energy\rightarrow C+D

Energy of A = 85.1 J

Energy of B = 87.9 J

Energy on reactant side =  Energy of A + Energy of B  + Energy absorbed 85.1 + 87.9 + 104.3 = 277.3 J

Energy on reactant side = Energy on product side = 277.3 J

Energy on product side = Energy of C + Energy of D

277.3 J = 38.7 J  + Energy of D

Energy of D = 238.6 J

Thus chemical energy product D must contain is 238.6 J

The law of conservation of energy states that energy is not created or destroyed during chemical reactions. The total amount of energy in the reactants, plus the energy absorbed during the reaction, must be equal to the total energy of the products.

Product D contains (85.1 J + 87.9 J + 104.3 J) – 38.7 J = 238.6 J of chemical energy.

Jordan wonders why there is dew on the grass in the morning. He asks a few friends to see what they think. His friend Tasha says that there is dew on the grass because it always rains at night. Did Jordan find a scientific answer?

Answers

No because dew is water droplets that come from condensation rather than from rain coming at night
Jordan did not find a scientific answer if a warm clear day is followed by a cool clear evening Dew will likely form
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