化学
化学反应、化学计量、分子结构与元素性质。
-
you learned earlier that isopropyl alcohol has areas of partial positiv…
My hypothesis is supported by my findings.
-
so far, it seems like youve established that isopropyl alcohol has area…
Isopropyl alcohol will dissolve in water, because they are both polar molecules.
-
to find out more about what types of molecules dissolve in water, lets …
It has no full positive or negative charge. It has a region of partial positive charge. It has a region of partial negative charge. It is a polar molecule. It is a dipole.
-
lets revisit your case now that weve learned a little bit about what ca…
It must have areas of both positive and negative charge such that they cancel each other out; It is a water - soluble ion with a full charge.
-
now, lets take a look at another molecule to determine if it will disso…
Iodine is held together with strong covalent bonds and lacks any significantly charged regions. The interactions between water and iodine are not strong enough to overcome these c…
-
the arrangement of water molecules around an ion is called a hydration …
\(Li^{+}\), \(Cl^{-}\), \(Mg^{2+}\)
-
usls: periodic table schools date team: instructions: use the periodic …
1) Metal 2) Nonmetal 3) Metalloid 4) Metal 5) Nonmetal 6) Metal 7) Metalloid 8) Metal 12) Noble gas group (Group 18) 13) Group 6 14) Group 1 15) Group 2 16) Group 1 17) Group 17
-
what attracts water to the different parts of salt? why would water be …
The oxygen in water is attracted to the positively charged sodium ion. The hydrogen atoms of water are attracted to the negatively charged chloride ion.
-
name: school: date: 13.1 periodic table instructions: use the periodic …
1. Francium (Fr) 2. Tellurium (Te) 3. Gold (Au) 4. Neon (Ne) 5. Aluminium (Al) 6. Metal 7. Metalloid 8. Non - metal 9. Metal 10. Non - metal 11. Non - metal
-
1. how would this element be classified? a. metal b. metalloid c. nonme…
1. a. Metal 2. c. Iron 3. b. Metalloid 4. c. Nonmetals 5. a. \(O\) 6. c. Nonmetals, metalloids, metals
-
make a prediction why do some substances dissolve in water while others…
C. Can mix with both oil and water
-
select the circle that represents liquid.
The middle circle (the one with arrows condensing, evaporating, freezing, melting related to it)
-
take a look at the two molecules below. what generally accounts for the…
Hydrogen bonding
-
rank the following molecules by the strength of the intermolecular forc…
Strongest: \(HF\), Middle: \(HCl\), Weakest: \(H₂\)
-
given molecules with the same molecular weight, in general, which of th…
Hydrogen bonding
-
1. what tool is used by scientists to classify elements? the electromag…
B. The Periodic Table of Elements # 2.
-
imagine that each substance below is in its pure form. match each of th…
\(NH_3\) - Hydrogen bonding; \(HBr\) - Dipole - dipole forces; \(N_2\) - London dispersion forces
-
which of the following molecules would form hydrogen bonds? check all t…
\(NH_3\), \(H_2O\), \(HF\)
-
exit ticket: the periodic table directions: answer the questions below …
1. a. Dull 2. d. Polonium 3. a. \(O\)
-
which of the following molecules would most likely exhibit dipole - dip…
\(NO_2\), \(CO\), \(PCl_3\), \(SO_2\), \(HCl\)
-
which of the following molecules likely has the lowest boiling point? i…
\(H_2\)
-
5. you are trying to find a good material to use as a conductor in your…
5. C. Iron 6. B. Metalloid 7. C. Nonmetals 8. a. \(O\) 9. c. Nonmetals, metalloids, metals 10. a. Metal
-
air pollution global agreements several laws have evolved to address ai…
to globally agree to decrease air pollution
-
air pollution global agreements several laws have evolved to address ai…
climate change and greenhouse gases
-
what we eat has changed more in the last forty years than in the previo…
B. Much of the taste and aroma of American fast food, for example, is now manufactured at a series of large chemical plants off the New Jersey turnpike
-
review iii use the following chemical names to generate the chemical fo…
Nitrogen monoxide: \(NO\) Sodium hypochlorite: \(NaClO\) Iron (III) hydroxide: \(Fe(OH)_{3}\)
-
review ii name the following substances. use lower - case letters for t…
potassium iodide iron(III) chloride dinitrogen pentoxide
-
review i using each label only once, classify what category of compound…
- \(PCl_{5}\): Covalent compound - \(NaNO_{3}\): Ionic with a polyatomic ion - \(HClO_{3}\): Oxyacid - \(HBr\): Binary acid - \(Ba_{3}N_{2}\): Ionic compound
-
key terms match the words on the left with the correct definition on th…
- Ionic compound: Made of a metal and nonmetal. - Polyatomic ion: Ion made of two or more atoms. - Monoatomic ion: Ion consisting of one atom. - Covalent molecule: Made of two or …
-
9. one of the reactions you balanced in part 1 contained the compound a…
\(1.776\) moles
-
most people store chemicals responsible for indoor air pollution in wha…
garage
-
read the next section of the openstax reading before answering the ques…
"Hydro - " was added to the beginning, The term ends in acid.
-
read the next section of the openstax reading before answering the ques…
- When an element has more than one atom, it must get a prefix to specify how many atoms it has. - The last element always ends in -ide. - When the first element has only one atom…
-
why do garages usually have low air quality? chemicals are stored in ga…
Chemicals are stored in garages.
-
pay attention to the types of molecules being addressed here in this pa…
\(NO_2\), \(SO_2\), \(CO_2\)
-
why is fecl₃ called iron (iii) chloride? there is only one iron in the …
\(CrCl_3\)
-
note: answers for questions 6, 7, 8, 10, and 11 are submitted with blan…
\(32.7\ g\)
-
before moving on, try to name the following three compounds. pay attent…
Calcium carbonate, Lithium chloride, Barium sulfate
-
a polyatomic ion usually refers to a covalently bonded group of two or …
A. \(BaCO_3\), C. \(H_2SO_4\)
-
chemical compound names before moving on, name the following chemical c…
Potassium chloride, Strontium bromide, Lithium oxide.
-
ionic compounds take a moment here to reflect on the composition of eac…
The first element is a metal, and the second is a nonmetal; The number of atoms belonging to either element is not reflected in the compound’s name; The name of the nonmetal ion g…
-
if fingerprints were left on the cuvette, how would that affect the abs…
The fingerprint would scatter the light, causing a higher absorbance.
-
which q.ns are different for the last two electrons placed in oxygen? i…
\(m_{l}\) and \(m_{s}\)
-
question 6 12.5 pts for blue 1 food dye, what color light was absorbed …
orange
-
question 4 12.5 pts after the calibration curve is created, the cuvette…
The concentration will be higher because the absorbance measured for the unknown will be larger.
-
question 3 12.5 pts is it possible to determine the molar absorptivity …
Yes. The absorptivity can be determined from the slope of the curve if the length of the cuvette is known.
-
consider borons electron configuration of 1s² 2s² 2p¹. which of the fol…
\([2,0,0,+\frac{1}{2}]\)
-
if 102.7 g of tin is mixed with 10.9 g of copper to create the alloy pe…
1.037 mol total
-
how many dozen are in one mole? 5.0×10^{22} dozen 2.0×10^{23} dozen 6.0…
\(5.0\times 10^{22}\) dozen (the first option)
-
which of the following contains the most atoms? you shouldnt need to do…
10.0 g He
-
what is the mass, in grams, of one mole of carbon? 12.0107 g 12.0107 × …
12.0107 g
-
note: answers for questions 6, 7, 8, 10, and 11 are submitted with blan…
Question 6: \(3.80\space mol\) Question 7: \(0.0239\space mol\)
-
silicon, which makes up about 25% of earths crust by mass, is used wide…
C. 28.0855 amu
-
part 2 calculations with the mole (points listed on each question—33 po…
- \(NaBr/Cl_2\): \(\frac{2}{1}\) - \(NaBr/NaCl\): \(1\) - \(NaBr/Br_2\): \(\frac{2}{1}\)
-
an interior designer wants to plan a room with a design that provides s…
Incorporate soft shapes in the room, such as curved furniture, round rugs, or flowing curtains and add in an organically shaped, conversation areas.
-
question 7 1 pts rank the following in terms of increasing electronegat…
Na, Mg, N, O, F # Question 8
-
what can the overall shape of a building convey? a buildings shape can …
A building's shape can convey mood, for example an organic shape suggesting a relaxed or calm mood, while a geometric shape can suggest a formal or rigid mood.
-
given the elements cl, ge, and k and the values 418, 1255, and 784 kj/m…
- First question: \(Cl: 1255\ kJ/mol; Ge: 784\ kJ/mol; and K: 418\ kJ/mol\) - Second question: \(C < O < N\)
-
rank the following species by radius, from largest to smallest: $cl^{-}…
- First question: \(S^{2-},Cl^-,Ar,K^+,Ca^{2+}\) - Second question: \(In\)
-
what is the effective nuclear charge experienced by the 2p and 3p elect…
11,7
-
part 2 calculations with the mole (points listed on each question—33 po…
3. \(1:1\) 4. \(102.89\space g/mol\) 5. Periodic table (to obtain atomic masses of \(Na\) and \(Br\))
-
question 11 (2.5 points) unsaturated fats are solid at room temperature…
have at least one double bond in their fatty acid tail
-
question 10 (2.5 points) a(n)_____is a type of chemical bond in which a…
ionic bond
-
question 9 (2.5 points) what category of compounds helps our body fluid…
B. buffers
-
question 8 (2.5 points) a solution at ph 7 contains how many times more…
1000
-
a solution is a uniform mixture in which a ______ is dissolved complete…
C. solute; solvent
-
utility operation and distribution use the information below to answer …
heating for homes and businesses
-
question 6 (2.5 points) a ph value of ____ has the highest concentratio…
A. 1
-
question 5 (2.5 points) the bond in table salt (nacl) is polar ionic co…
ionic
-
question 4 (2.5 points) which substance is hydrophobic? canola oil sodi…
canola oil
-
utility operation and distribution use the information below to answer …
to ensure the purity and safety of drinking water
-
question 3 (2.5 points) when water molecules form into ice, ____. the w…
the water molecules pack less densely
-
utility operation and distribution use the information below to answer …
career opportunities in oil and gas
-
question 7 1 pts a comparison of the electron configurations of the oxi…
- Question 7: The oxide ion and the sodium ion are isoelectronic. - Question 8: \(Zn\)
-
what is the ground - state electron configuration expected for cesium? …
\([Xe]6s^1\) (the second option) # Question 6
-
question 3 1 pts which statement gives the name and correct principle w…
Hund's rule: put one electron in each degenerate orbital first, then add one more electron with an opposite spin to each orbital. ### Question 4
-
the maximum number of electrons that the 2nd energy level an atom can h…
8 ### Second Question
-
what is the missing particle? 147 62 sm → 4 2 he + ? 143 62 nd 143 60 n…
\(^{143}_{60}Nd\) (the second option \(^{143}_{60}Nd\))
-
what is the missing particle? 198 86 rn→194 84 po+? 2 4 he 4 2 h 4 2 he
\(^4_2He\) (the third option)
-
what is the missing particle? 225 89 ac → 4 2 he + ? 223 87 ac 221 87 f…
\(\ce{^221_87Fr}\)
-
what particle has 11 protons and 12 neutrons? 12 mg 24.31 23 v 50.94 11…
Na - 23
-
what is the name of the element? 10 5 b neon bromine boron
boron
-
what is the name of the element? 63 29 cu copper europium cobalt
copper
-
11. the diagram represents the electron dot formula for the bonding of …
- The two electrons that the \(Mg\) atom loses are gained by the chlorine atom. - The two elements join together in an ionic bond.
-
match the following to the descriptions, then click the submit button t…
A. Generator, B. Battery, C. Starter, D. Fuses
-
part i balancing (3 points per equation—30 points total) 1. balanced th…
\(2\text{Sb}(s)+3\text{Cl}_2(g) = 2\text{SbCl}_3(s)\)
-
what is the correct formula for magnesium phosphate? a mg3(po)2 b mgpo4…
A. \(Mg_{3}(PO_{4})_{2}\)
-
what is a polyatomic ion? an ion made of two atoms of the same element …
An ion made of many atoms bonded together
-
6. substance a is a gas, substance b is a liquid and substance c is a s…
C > B > A
-
what is the correct name for the compound in the image? aluminum nitrat…
Aluminum nitrite
-
which of the following compounds exhibits a linear molecular geometry? …
\(CO_2\), \(BeF_2\)
-
ionic bonding and ionic compounds level: 2/2 4 more questions to go aft…
Magnesium hydroxide
-
what is the correct formula for calcium oxide?
A. \(CaO\)
-
unit 5: periodic trends test review what to study? • quizzes • homework…
a) group b) Mendeleev c) atomic number d) periodic law e) \(ns^{2}np^{5}\) (or \(7\) valence electrons) f) alkali g) \(f\) h) \(14\) i) transition metals j) \(ns^{2}\) k) ion; ele…
-
2. dmitri mendeleev studied the chemical characteristics of elements in…
Predicting the reactivity of elements.
-
what is the correct name for the compound in the image? lithium carbon …
Lithium carbonate
-
what is the correct formula for calcium nitrate?
C. \(Ca(NO_3)_2\)
-
simone created a chart to summarize the energy transformations that tak…
kinetic energy transformed to mechanical energy
-
when a spring is compressed, the energy changes from kinetic to potenti…
A. work
-
which two types of potential energies would be types of mechanical ener…
elastic and gravitational