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Answer is A
Reason is because an ideal gas requires lower pressure

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the Answer is C beause electronegativity gets higher going to the right

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The answer is B because of how protons are positive and electrons are negative so if there is a equal amount of protons and electrons the atom becomes neutral.

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The Answer is B. The outer shell has the valence electrons so the answer is B.

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The answer is A. This is since the reference table shows that sodium is 2-8-1 while in ground state and energy is not moving.

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Answer is D
Reason is because when an energy is being absorbed its endothermic and also energy is required in order to break a chemical bond so the only equation that represents this is H2+energy>H+H

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The answer is A. Since it has the lowest density and when changed to K is still has the smallest density, the answer must be A.

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The answer is D. The equation being showed is a compound which can be broken once it's in a bond. You also need energy to break a bond so your answer must be D the only one showing that on the reactant side.

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The answer is D. Kinetic energy is known as heat energy. This is also known as a change in temperature.

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Answer is B
Reason is because electronegativity describes the attraction a atom has for electrons in a chemical bond.

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The answer is D because the wave-mechanical model determines where an electron is most likely found.

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The answer is D because the molecules in NH3 are polar.

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The answer is A because ammonia is a compound.

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Answer is B
Reason is Fe^+2O^-2 switch oxidation states and voila you get FeO2

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The answer is Kr because when rubidium loses an electron, the electron configuration will be similar to Kr.

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The answer is A. Endothermic tends to be with heat energy. Since it's changing from Solid to Gas so it's a chemical change.

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Answer is C because when the water boils it leaves behind what was dissolved in it

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The reason is because the test tube is an open system.

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Answer is B
The nucleus contains neutrons, there will always be an electron located in the outer most shell.

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The answer is D. Changing the temperature is the only factor out of the choices to change the chemical equilibrium.

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The answer is B.
Protons plus electrons will give you 0 which is neutral.

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Answer is D
This is a double replacement reaction because the elements Cl , N, and O switched places in the chemical equation

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Adrian Garcia (c) #3
The answer is C because:

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Adrian Garcia (c) #14
The answer is C because the elements are arranged in order of increasing atomic number.

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Adrian Garcia (c) #11
The answer is B because the nucleus charge is equal to the proton charge.

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Adrian Garcia (c) #2
The answer is B because to find the percent composition, you divide the mass of KNO3 by the mass of H₂O

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Adrian Garcia (c) #19
The answer is B because ionic and molecular are two terms that represent major categories of compounds.

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Adrian Garcia (c) #7
The radius of a cesium ion is smaller than the radius of a cesium atom because a cesium ion has less electron shells than a cesium atom.

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Adrian Garcia (c) #22
The answer is B because metals are excellent conductors of electricity.

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Adrian Garcia (c) #1
The answer is B because:

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Adrian Garcia (c) #13
The answer is D because J.J. Thomson’s experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic electrons.

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The answer is A.

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The answer is D.
The reason is because in order to break a chemical bond, energy is required so it the energy is being absorbed to break the bond.

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The answer is B.
The reason is because collision theory require two particles to interact with the same amount of proper energy and orientation.

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The answer is B.

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Answer is C.) 4.29L

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The answer is Krypton because rubidium in rubidium chloride is most likely to lose an electron and if it loses an electron then it will have the same electron configuration as krypton in the ground state.

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The answer is A.
C can not be broken down anymore.

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The answer is A.) ammonia because every other choice is an element and elements can not be broken down; the other choices are aluminum, antimony, and argon.

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The answer is D.) NH3 because Nitrogen is surrounded by 3 hydrogen and it is usually asymmetrical when there are 2 elements and a subscript is uneven.

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The answer is C because percent composition is part of whole over whole multiplied by 100 and the part is 25g and the whole is 225g because 25g of KNO3 is dissolved into 200g of H20 so it must be (25/225) x 100.

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The answer is A.
When speeding up a reaction, only the rate of reaction increase and not the activation of energy. It stays the same.

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The answer is B.) the nucleus because the nucleus contains protons and electrons and protons have a positive charge and neutrons have no charge so the nucleus has an overall positive charge.

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The answer is D.
The reason is because Cl and NO got replaced.

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The answer is B.
The reason is because Valence electrons are known as the last electrons which are normally found in the last shell which is the outer most.

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The answer is C.) atomic number because when you move from left to right in a periodic table the atomic number increases in order

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The answer is B.) Ionic and molecular because ionic compound is a category unlike empirical which is just about the subscripts and we have not gone over nuclear compounds yet and molecular compounds are also known as covalent compounds and we have gone over ionic and covalent compounds so the answer is clearly B.

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The answer is A.
The reason is because if you look at table S and compare it to the others, you can see that Ne has the lowest density

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The answer is B because entropy is defined as disorder and the only choice that has disorder is h2o from gas to solid, this does not follow the water cycle so it is not in order.

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The answer is C.
The reason is because as heat moves from a solid to a gas, heat expands so and so does gas particles so energy is being released.

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The answer is B because h2o and h2o2 are both compounds since they have at least 2 elements and they are different chemicals and different chemicals have different properties.

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The answer is B.) thermal, chemical, electromagnetic because thermal energy is relating to heat and it is not called temperature energy so choices c and d are out. Electronegativity is not a form of energy so that only leaves choice B which does have 3 forms of energy.

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The answer is D.
The reason is because in order to keep the equation balanced, the equation if their is 6 moles of O2 on the reactant side then their has to be 4 moles on the product side.