![subject](/tpl/images/cats/himiya.png)
Chemistry, 07.10.2019 17:50 aidanfbussiness
Check my semester exam ! i have a flight to must submit !
question 1 (multiple choice worth 2 points)
[07.06]what is the major difference between nuclear and chemical reactions?
only chemical reactions release energy.
only chemical reactions release gamma rays.
only nuclear reactions involve the exchange of electrons.
i picked: only nuclear reactions change the identity of an element.
question 2 (multiple choice worth 2 points)
[07.03]when water is added to an erlenmeyer flask and then sealed, phase equilibrium occurs. which answer explains the resulting dynamic equilibrium?
rate of evaporation = rate of precipitation
i picked: rate of condensation = rate of evaporation
moles of vapor = moles of liquid
moles of vapor = moles of solid
question 3 (multiple choice worth 2 points)
[05.01]which phase of matter is made up of particles that are packed closely together, with both a definite shape and a definite volume?
gas
liquid
plasma
i picked: solid
question 4 (multiple choice worth 2 points)
[06.02]when sulfuric acid is poured on sugar the volume of sugar expands and the sugar turns black and becomes very hot. which of the following best describes this reaction?
endothermic
i picked: exothermic
decomposition
synthesis
question 5 (multiple choice worth 2 points)
[07.01]which of the following is not true of acids?
acids are corrosive.
i picked: acids feel slippery.
acids have a sour taste.
acids have more hydronium ions than hydroxide ions.
question 6 (multiple choice worth 2 points)
[06.04]according to the collision theory, what is the best explanation for why a higher temperature makes a reaction go faster?
there are fewer collisions per minute.
it increases the distance between the particles.
it decreases the average kinetic energy of the particles.
i picked: it increases the average kinetic energy and number of collisions per minute.
question 7 (multiple choice worth 2 points)
[07.02]which of the following represents pure water?
[h3o+] > [oh-]
[h3o+] < [oh-]
i picked: [h3o+] = [oh-]
[h3o+] [oh-] = 14
question 8 (multiple choice worth 2 points)
[07.06]which of the following types of radiation can penetrate the most deeply into your body?
alpha rays
beta rays
i picked: gamma rays
proton rays
question 9 (multiple choice worth 2 points)
[07.05]in the chemical reaction shown below, which element was oxidized?
2k + cl2 yields 2kcl
i picked: k, because it lost one electron
k, because it gained one electron
cl, because it lost one electron
cl, because it gained one electron
question 10 (multiple choice worth 2 points)
[06.02]on an exothermic potential energy diagram, what is true for the products?
the products are at the same energy level as the reactants.
i picked: the products are at a lower energy level than the reactants.
the products are at a higher energy level than the reactants.
the products do not have energy.
question 11 (multiple choice worth 2 points)
[07.02]what is the salt formed in the following neutralization reaction?
mg(oh)2 + hcl yields h2o + mgcl2
mg(oh)2
hcl
h2o
i picked: mgcl2
![ansver](/tpl/images/cats/User.png)
Answers: 3
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 21.06.2019 18:30
Calculate the change in entropy if br2(l) is converted into gaseous br atoms. s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)
Answers: 2
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 14:00
The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.
Answers: 3
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 18:00
Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin
Answers: 2
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 19:30
What is the area in square meters of 448 g ai foil that has a thickness of 23921 nm? the density is 2.70 g/cm
Answers: 3
You know the right answer?
Check my semester exam ! i have a flight to must submit !
question 1 (multiple choice...
question 1 (multiple choice...
Questions
![question](/tpl/images/cats/health.png)
Health, 30.06.2019 02:00
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/fr.png)
![question](/tpl/images/cats/geografiya.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 30.06.2019 02:00
![question](/tpl/images/cats/istoriya.png)
History, 30.06.2019 02:00
![question](/tpl/images/cats/istoriya.png)
History, 30.06.2019 02:00
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 30.06.2019 02:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/ekonomika.png)
Business, 30.06.2019 02:00
![question](/tpl/images/cats/fizika.png)
Physics, 30.06.2019 02:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 30.06.2019 02:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/es.png)
Spanish, 30.06.2019 02:00
![question](/tpl/images/cats/mat.png)
Mathematics, 30.06.2019 02:00