Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
-
like solids, liquids have a ______?______ volume. fixed variable unlimi…
fixed
-
question 7 1 pts calculate the magnitude of w, in kj, for a system that…
$14.3$
-
when poured into a container, liquids ______?______ and take the ______…
flow, shape
-
line, wedge and dash drawings when drawing lewis structures, we can inc…
In the plane of the paper: \(H\), \(C\), \(Br\) In front of the plane of the paper: \(F\) Behind the plane of the paper: \(Cl\)
-
1. answer the following questions regarding atoms of selenium (se) and …
For \(_{34}^{80}\text{Se}\): Protons: 34, Neutrons: 46, Electrons: 34. For \(_{35}^{79}\text{Br}^{-1}\): Protons: 35, Neutrons: 44, Electrons: 36. ### b.
-
question 1 select the best definition for each term. law of conservatio…
- Law of conservation of energy: Energy cannot be created or destroyed, but can change in form. - Thermochemistry: The study of heat associated with chemical reactions and physica…
-
3. look at the following chemical equations. agi + na₂s → ag₂s + 2 nal …
It is balanced because the reactants contain the same number of sulfur (S) atoms as the products.
-
look at the image on screen. in which of the three phases (solid, liqui…
gas (farthest apart), solid (closest together)
-
7. chemical equations must be balanced because -- mass can neither be c…
mass can neither be created nor destroyed.
-
using the puzzle pieces provided (and by duplicating them), create thre…
Compound 2 formula: \(AlPO_{4}\) (aluminum phosphate) Compound 3 formula: \((NH_{4})_{3}PO_{4}\) (ammonium phosphate)
-
which equation represents the standard enthalpy of formation, \\( \\del…
$\frac{1}{2}H_2(g)+\frac{1}{2}N_2(g)+O_2(g)\longrightarrow HNO_2(aq)$
-
given the thermochemical equation: 1/2 n₂(g) + 1/2 o₂(g) → no(g) δh°rxn…
\(-180.5\space kJ\) (the third option)
-
copper metal has a specific heat of 0.385 j/g·°c. calculate the amount …
7.51 kJ
-
using the puzzle pieces provided (and by duplicating them), create thre…
Compound 2: Name: Copper(II) oxide Formula: \(CuO\) Compound 3: Name: Cobalt(III) bromide Formula: \(CoBr_{3}\)
-
4. look at the following equation. __au₂o₃→__au+__o₂ in order to follow…
\(2,4,3\)
-
3. which chemical equation is correctly balanced? 2 kcl(s) = 2 k(s) + c…
\(2KCl(s)\to2K(s)+Cl_2(g)\)
-
2. in the balanced equation $x + cl_2 \\to c_2h_5cl + hcl$ which molecu…
\(C_{2}H_{6}\)
-
1. when the equation _al(s) + _o₂(g) → _al₂o₃(s) is correctly balanced …
\(4\) (the fourth option)
-
the cerebral management of information received from our senses and tra…
Cognition
-
the potential energy stored in the nucleus of an atom, produces radioac…
1. Nuclear energy 2. Chemical energy 3. Gravitational potential energy 4. Mechanical energy 5. Elastic potential energy 6. Kinetic energy
-
ionic bonds chemical naming practice name the following ionic compounds…
1. Sodium bromide 2. Calcium oxide 3. Lithium oxide 4. Magnesium bromide 6. Beryllium hydroxide 7. Iron(III) chloride 8. Lead(II) oxide 9. Ammonium sulfate 10. Cobalt(II) sulfide …
-
diluting a pollutant over and over until it is very difficult to detect…
serial dilution
-
is a deadly, colorless, odorless gas that is a by - product of incomple…
Carbon Monoxide
-
15. rank the bonds according to increasing electronegativity. (0.5 poin…
\(Si - H\lt C - H\lt Br - H\lt Cl - H\lt O - H\)
-
rogue heart by axie oh (excerpt) the dreamers gather in neo beijings st…
A. a search over an entire area
-
10. write the formula for sulfur dichloride (0.5 points) * enter your a…
10. \(SCl_{2}\) 11. \(S_{2}F_{10}\) 12. polar covalent bond 13. nonpolar covalent bond 14. Fluorine (\(F\))
-
6. name n2h4 (0.5 points) *
Hydrazine
-
4. name h2o (0.5 points) * enter your answer 5. name nh3 (0.5 points) *…
4. Water 5. Ammonia 6. Hydrazine 7. Diphosphorus pentoxide 8. CBr₄ 9. PF₃
-
* required 1. what type of bond would exist between a hydrogen atom and…
1. polar covalent bond 2. ionic bond 3. nonpolar covalent bond
-
(b) the student used a 50.0 ml buret to add the kmno₄(aq) to the h₂c₂o₄…
The initial reading is \(3.00\ \text{mL}\), the final reading is \(28.00\ \text{mL}\), and the volume of \(KMnO_4(aq)\) added is \(25.00\ \text{mL}\)
-
6h^{+}(aq)+2mno_{4}^{-}(aq)+5h_{2}c_{2}o_{4}(aq)→10co_{2}(g)+8h_{2}o(l)…
The species that was reduced is \(MnO_{4}^{-}\). The oxidation number of \(Mn\) decreases from \(+7\) in \(MnO_{4}^{-}\) to \(+2\) in \(Mn^{2+}\).
-
mixed ionic and covalent naming 12) ti(so₄)₂ 13) cu(no₃) 14) crbr₂ 15) …
16) \(CuO\) 17) \(KCN\) 18) \(SiS_2\) 19) \(P_2O_3\) 20) \(Si_2Se_4\) 21) \(Fe_3(PO_4)_2\) 22) \(BCl_3\) 23) \(Mg(NO_2)_2\) 24) \((NH_4)_3N\) 25) \(SeCl_3\) 26) \(CoCl_2\) 27) \(N…
-
32 sodium is another name for: a magnesium b copper c salt d iron
C. Salt
-
use the mole quick check the atomic mass of copper (cu) is 63.546 amu, …
159.607 g/mol
-
the atomic mass of the element niobium (nb) is 92.906 amu. which measur…
1 mole of $Nb = 92.906$ grams
-
use the mole quick check the atomic mass of the element platinum (pt) i…
\(6.022\times 10^{23}\space atoms\) (the second option)
-
use the mole quick check for an element, how does avogadros number conn…
It describes the number of atoms in 1 mole of an element.
-
the atomic mass unit is equivalent to \\( \\frac { 1 } { 12 } \\) of th…
carbon
-
the benefits of regular exercise are undeniable and extensive, ranging …
- Marathon running may cause temporary but severe kidney injury. - Ironman triathlon competitors are susceptible to many serious health problems. - Extreme endurance athletes do n…
-
mixed ionic and covalent naming use the flow chart above to help you na…
1. Calcium hydroxide 2. Barium fluoride 3. Iron (II) nitrate 4. Carbon tetrafluoride 5. Dinitrogen trioxide 6. Diphosphorus trioxide 7. Manganese (IV) sulfide 8. Lithium phosphide…
-
13) ammonium nitrate 14) sodium phosphate 15) lithium hydroxide naming …
13) $\text{NH}_4\text{NO}_3$ 14) $\text{Na}_3\text{PO}_4$ 15) $\text{LiOH}$
-
for each of the following scientists, describe his contributions to bon…
Newton: thought atoms were sticky. Berzelius: thought that there is a force holding molecules together (like magnets). Lewis: two atoms share electrons. Pauling: bonding is an ove…
-
lewis structures use _______________ to show bond pairs. * 1 point stra…
straight lines
-
1. label the trends in the periodic table that you have seen in this ac…
- Atomic mass: Increases across a period and down a group. - Atomic radius: Decreases across a period and increases down a group. - Ionization energy: Increases across a period an…
-
13) ammonium nitrate 14) sodium phosphate 15) lithium hydroxide write t…
16) Potassium sulfate 17) Manganese (II) nitrate 18) Sodium phosphate 19) Strontium dichromate 20) Sodium carbonate 21) Strontium permanganate 22) Iron (II) phosphate 23) Aluminum…
-
match the element to its type of atom metal choose choose nonmetal tell…
- metal: Iron - nonmetal: Fluorine - metalloid: Tellurium
-
problem - solving lab 6.2 use numbers why does ice float? most liquids …
1. The density of water is \(1\ g/cm^{3}\) (\(Density_{water}=\frac{126\ g}{126\ cm^{3}}\)) and the density of ice is \(0.9\ g/cm^{3}\) (\(Density_{ice}=\frac{126\ g}{140\ cm^{3}}…
-
match the element to its electron activity when forming a bond. o choos…
- O: gain 2 electrons - Ga: lose 3 electrons - Cl: gain 1 electron - Li: lose 1 electron - As: gain 3 electrons - Mg: lose 2 electrons
-
question 12 (2 points) a sample of naturally occurring leungstine consi…
The natural abundance of \(Lg - 28\) is \(92.18\%\) and the natural abundance of \(Lg - 30\) is \(3.15\%\)
-
8. justify why the number of valence electrons increases going across a…
A. increases; B. remains the same; C. outermost shell; D. 8
-
11. arrange the following elements in order from smallest electronegati…
A. Na, B. Al, C. C
-
match the element to its number of valence electrons. mg choose choose …
- Mg: 2 - Br: 7 - Ga: 3 - Li: 1 - Ar: 8 - P: 5
-
10. arrange the following elements in order from smallest electronegati…
A. Te, B. S, C. O
-
9. determine which element has the largest electronegativity based on t…
\(F\)
-
12. arrange the following elements in order from smallest ionization en…
A. Pd, B. P, C. Ne
-
11. arrange the following elements in order from smallest ionization en…
A. \(Br\) B. \(Cl\) C. \(F\)
-
10. determine which element has the largest ionization energy based on …
Cl
-
question 12 (2 points) a sample of naturally occurring leungstine consi…
The natural abundance of Lg - 28 is approximately \(92.03\%\) and the natural abundance of Lg - 30 is \(3.3\%\)
-
6. get the big picture explain why water dissolves so many different su…
Water is a polar molecule. Polar and ionic substances can interact with it. Ionic compounds dissociate into ions that are attracted to water's partial charges. Polar covalent subs…
-
4) a concentration of 13.5 ppm of mercury is found in a body of water w…
\(2.04\ g\)
-
13 essay 5 points which group on the periodic table would have elements…
Group 14 (or IVA)
-
determine the location of the elements on the periodic table with the s…
The elements with a small ionization energy are all in group 1 (the column at the left of the periodic table).
-
determine the location of the elements on the periodic table with the l…
The elements with a large ionization energy are all in group 18 (the column at the right of the periodic table).
-
12 essay 5 points how many lone pairs of electrons does the element bel…
2
-
11 essay 5 points how many more valence electrons does this element nee…
\(2\)
-
10 essay 5 points how many valence electrons do elements with the dot m…
8
-
3) if a mass of 2.6 g of mercury is dissolved in 4 l of water, what is …
\(650\)
-
essay 5 points how many more valence electrons does the element below n…
3
-
how many more valence electrons does this element need to fulfill the o…
3
-
7 essay 5 points what period is this element in on the periodic table? …
The element is in Period 4.
-
14. arrange the following elements in order from smallest radius to lar…
A. \(C\), B. \(Ge\), C. \(Sn\)
-
13. determine which element has the largest atomic radius based on the …
\(Cs\)
-
12. justify why atomic radius decreases across a period and increases d…
- A: As we move across a period, the nuclear charge increases while electrons are in the same shell. Stronger nuclear attraction pulls electrons closer, decreasing atomic radius. …
-
5 essay 5 points what group is this atom in on the periodic table? edit…
Group 1
-
11. consider group 1 of the periodic table. describe how the nuclear ch…
- **Nuclear charge (number of protons)**: Increases. The effect on attraction strength: Has a stronger attraction (in theory, if only considering the increase in nuclear charge). …
-
calculating ppm: practice 1) if a mass of 12.0 mg of mercury is dissolv…
\(1.2\times 10^{-7}\) ppm
-
2. choose the correct answer. a pack of batteries has ____ potential en…
2. chemical 3. heat
-
7. choose the correct answer. ____potential energy is stored in a ball …
7. Gravitational 8. Elastic
-
15. choose the correct answer. the sun gives off light because of _____…
radiant
-
elements with similar chemical properties are found a. in the same peri…
C. in the same group (column)
-
estimate the enthalpy change for the reaction $c_{2}h_{4}(g)+h_{2}(g)\t…
-119 kJ
-
calculate \\( \\delta h^{\\circ} \\) for the reaction shown below given…
-282.6 kJ
-
given: so₂(g) + ½o₂(g) → so₃(g) δh° = -99 kj what is the enthalpy chang…
+198 kJ
-
how much heat is evolved when 320 g of so₂ is burned according to the c…
495 kJ
-
copper metal has a specific heat of 0.385 j/g °c. calculate the amount …
7.51 kJ
-
what are synthetic chemicals? living things that can cause mutations ch…
chemicals found in products that can cause mutations
-
determine what all of the elements in a set of points have in common. t…
They are all in the same group (column) on the periodic table.
-
h₂ + o₂ → h₂o if 4.0 moles of hydrogen gas reacts with 42g of oxygen ga…
\(47.25g\) ### Second Question:
-
answer each question. please note: you can answer each question only on…
By adding or extracting electrons.
-
6. describe the trend in atomic radius as you move from top to bottom a…
As you move from top to bottom of a group, atomic radius increases.
-
determine where on the periodic table you find the elements with the la…
The elements with a large radius are all in group 1 (the column at the left of the periodic table).
-
read & respond use the text below to answer the question. air, steam an…
B. They have will expand to fill the shape of containers.
-
read & respond use the text below to answer the question. trees, banana…
B. Watermelon
-
5. determine which element has the largest atomic mass based on the loc…
Ag (Silver)
-
if 15.0g of caco₃ is heated, the theoretical yield of cao is 8.40g. if …
$72.6\%$
-
4. justify why atomic mass increases as atomic number increases. hint: …
The atomic number is the number of protons. Protons and neutrons (which often increase with protons as atomic number rises) each have a mass of about 1 amu. So, more protons (and …
-
calculate the molar mass of kal(so₄)₂·12h₂o? report your answer with at…
\(474.38\space g/mol\)
-
8. determine what happens to the atomic radius as you go down a group. …
The atomic radius increases as you move down a group.
-
7. this simulation shows atoms as a nucleus surrounded by an electron c…
The atomic radius decreases as you go from left to right in a period.
-
drag the missing word into place well, don’t have a definite volume. th…
gases