CHEMISTRY HIGH SCHOOL

Based on your own understanding and information in this lesson, what characteristics of the Confederate States of America made it a confederal government when compared to the government of the United States?

Answers

Answer 1
Answer: The main characteristic of the Confederate States of America that made it a confederal government when compared to the government of the United States was that its central power was much weaker. 
Answer 2
Answer:

Answer:

Exact answer (reword it yourself)

Explanation:

The Confederate States of America had a weaker central government than the United States, and individual states had more sovereignty and power that US states. The central government of the Confederate States handled only foreign issues or national economic issues.

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Salinity is a measure of which of the following in water?a. carbon dioxideb. oxygenc. dissolved saltsd. sand
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James is preparing three solutions of salt water. Each of the solutions has the same amount of water in the beaker and a different amounts of salt. In the first beaker, there is one scoop of salt in the beaker. The second beaker has two scoops of salt. The third beaker has three scoops of salt. Which of the beakers is the most concentrated solution?

. As the elements in Period 3 are considered in order of increasing atomic number, there is a general decrease inatomic mass
atomic radius
electronegativity
first ionization energy

Answers

Atomic radius, because the number of electrons and protons increases by 1 each time you move right along period so there is greater electrostatic attraction (electrons are pulled to the nucleus more strongly) and there is no additional shielding to counteract this since the number of inner energy levels does not increase along a period.

If 6.49 mol of ethane (C2H6) undergo combustion according to the unbalanced equationC2H6 + O2 −→ CO2 + H2O ,
how many moles of O2 is required?
1. 27.79
2. 7.63
3. 8.4
4. 25.48
5. 12.635
6. 21.035
7. 23.8
8. 19.04
9. 22.715
10. 26.775
Answer in units of mol.

Answers

Answer:

22.715 moles of oxygen are used

Explanation:

Given data:

Number of moles of ethane = 6.49 mol

Number of moles of O₂ required = ?

Solution:

Chemical equation:

2C₂H₆ + 7O₂       →     4CO₂ + 6H₂O

Now we will compare the moles of oxygen with ethane.

                    C₂H₆           :           O₂  

                       2              :             7

                     6.49           :           7/2×6.49 = 22.715 mol

Thus, 22.715 moles of oxygen are used.

use the reaction that occours when magnesium burns in oxygen to show how a reaction might be included in more than one category of reaction

Answers

2Mg+O₂⇒2MgO
It can be a combustion reaction, or it can be a combination reaction

18. Which of the following reactions are endothermic or exothermic? Explain your answers. A. When a certain amount of potassium nitrate is dissolved in water, the water temperature drops from 23°C to 18°C. B. Jack cooks himself a steak. C. When cold water is mixed with sulphuric acid, the mixture can rapidly reach the boiling point of water. D. A flare burns up slowly.

Answers

Answer:

The answer to your question is below

Explanation:

An endothermic reaction absorbs heat to proceed.

An exothermic reaction releases heat to proceed.

A. When a certain amount of potassium nitrate is dissolved in water, the water temperature drops from 23°C to 18°C. This is an example of an endothermic reaction because of the temperature diminishes.

B. Jack cooks himself a steak. This is an endothermic reaction because the steak does not cook itself it needs heat to be cooked.

C. When cold water is mixed with sulphuric acid, the mixture can rapidly reach the boiling point of water. This is an exothermic reaction because the temperature of water increases, which means that energy is been released.

D. A flare burns up slowly. I think it is an endothermic reaction because it was supply energy to proceed.

Which of the following Group 2 elements has the lowest first ionization energy?(1) Be (3) Ca
(2) Mg (4) Ba

Answers

Barium (Ba) has the lowest first ionization energy among the given elements of group 2. Therefore, option (4) is correct.

What is ionization energy?

The ionization energy is the minimum amount of energy that is required to knock out an electron in a gaseous atom or ion. Ionization energy can also be used to estimate the strength of chemical bonds and is measured in units of electronvolts or kJ/mol.

Alkaline earth elements can lose both valence electrons to attain a noble gas configuration. So, these elements have two ionization energies. 1st ionization energy of alkaline earth metals is the energy required to remove the first electron from the neutral atom.

With increasing atomic size down the group, the valence electron gets shielded by the inner electrons. So they can easily be removed with less energy. Hence the first ionization energy of group 2 elements decreases with an increase in the atomic number or atomic size.

Therefore, Barium has the lowest first ionization energy.

Learn more about ionization energy, here:

brainly.com/question/1602374

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The elements ionization energy increases from Ba

write a balanced chemical equation for the reaction of zncl2 with excess NaOH to produce Na2Zn(oh)4 sodium zincate. what mass of sodium zincate can be produced from 2.00 g of ZNCl2 with excess Naoh by this reaction?

Answers

4NaOH _((aq)) + ZnCl_(2)_((aq)) ----\ \textgreater \ Na_(2)Zn(OH)_(4)_((ppt)) + 2NaCl (aq)
 
mol = (mass)/(molar mass)
∴  mol of ZnCl_(2) = (2.00 g)/([(65)+(35.5 * 2)g/mol)
                                    =  (2.00 g)/(136 g/mol)
                                    =  0.0147 mol

Moles of Na_(2)Zn(OH)_(4) :
ratio of ZnCl_(2) : Na_(2)Zn(OH)_(4)
                       1      :       1
∴ Moles of Na_(2)Zn(OH)_(4) <span> = 0.0147 mol

Mass = Molar Mass * Mol
∴ Mass of Na_(2)Zn(OH)_(4) <span> = [(23 * 2)+(65)+(16 * 4) + (1*4)] g/mol * 0.0147 mol
                                                       = 179 g/mol * 0.0147 mol
                                                       = 2.63 g
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