Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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which of the following set of properties is most likely for a liquid wi…
high melting point and high boiling point
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which is an impact on the economy due to stormwater runoff? aquatic nui…
D. Important commercial and recreational fisheries may decline due to oil and chemical pollution carried by stormwater runoff.
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which substance would you most likely need to cool to the lowest temper…
ethane (C₂H₆), a nonpolar covalent compound
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which substance most likely has the highest boiling point? calcium chlo…
calcium chloride ($CaCl_2$), an ionic compound
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because they penetrate the visible surface of a painting, ultraviolet a…
B. It can definitively undermine that attribution.
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test name: goodmate exam question: 7 of 30 remaining time: 02:57:28 << …
Holding tanks that do not allow discharge are the most common kind of Type III MSD used on recreational boats. Waste is stored until it can be pumped out to a reception facility.
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which is not a characteristic of mangroves? they provide unique habitat…
They are trees found in fresh water wetlands that develop exposed roots to help them transfer oxygen.
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question 8 of 10 which story premise most clearly lacks conflict? a. a …
D. A man and a woman ride the same bus to and from work every day but never speak to each other.
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in the author to her book, the main reason bradstreet uses inversion is…
C. complete the rhyme scheme.
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question 15: an atom of beryllium has 4 protons, 4 electrons, and 5 neu…
C. 9
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question 14 this is the periodic entry for the element boron. what is t…
B. 10.81
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question 13: the periodic table of elements is shown. when an object ma…
B. iron, oxygen, hydrogen
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question 11: an iron (fe) nail is left outside in the rain and is expos…
C. This is a chemical reaction and mass is conserved because the mass of the iron and oxygen around the nail is equal to the mass of iron plus the oxygen in the rust that formed.
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question 12: the periodic table of elements is shown. respiration is th…
3
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law of conservation of mass states- a that in order to conserve mass we…
C. That the mass in chemical reactions can not be created nor destroyed, just rearranged.
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question 9: this equation describes the chemical reaction that occurs d…
24
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question 6: a chemical equation for the reaction between calcium hydrox…
B. 98g
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question 5: two solutions are mixed and react to produce the solid prec…
C. The mass remains constant
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question 7: an equation for a chemical reaction is shown. naoh + hcl → …
C. Two hydrogen atoms are in the reactants, and two hydrogen atoms are in the products.
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question 2: alex is developing models to explain how matter is classifi…
B. The atoms in the substance are held together in chemical bonds.
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question 10 1 pts a bottle contains 3.100ml of a liquid. the total mass…
$0.6645g/mL$
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question 2: alex is developing models to explain how matter is classifi…
B. The atoms in the substance are held together in chemical bonds.
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which part of john daltons theory was disproved by j.j. thomsons cathod…
Atoms are indivisible.
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historical understandings quick check what is unique about how the peri…
Elements with similar properties are grouped together in a pattern.
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question 1: which model best represents an element?
A. The model with all identical di - atomic molecules, B. The model with all identical di - atomic molecules
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which of these observations are not explained by kinetic - molecular th…
At very low temperatures, gases expand less for a given pressure change than they do at high temperatures.
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the four naturally occurring isotopes of sulfur are s - 32, s - 33, s -…
S - 32
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given the table representing the subatomic particles in four different …
E. Option E
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two atoms that are different isotopes of the same element have the same…
the same number of protons but a different number of neutrons
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how many neutrons does uranium-235 have? 235 u 92 92 143 146 235
143
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the ion k+ has gained one electron gained one proton lost one electron …
C. lost one electron
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which of the following ions lost two electrons? li+1 cl-1 mg+2 s-2
C. $\text{Mg}^{+2}$
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question 9. d. the atom is a negatively - charged isotope. question 10.…
Atoms vary based on their number of protons, ions vary based on their number of electrons, isotopes vary based on their number of neutrons.
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carol has an unknown element in group 17. using the periodic table, how…
7
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a teacher is doing an acid - base reaction. she has 25.00 ml of hydroch…
D. a buret
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read the excerpt from ovids pyramus and thisbe. the blood leaped high; …
The figurative language describes the violence of the scene.
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read shakespeares \sonnet 19.\ devouring time, blunt thou the lions paw…
- the abab, cdcd, efef, gg rhyme scheme - the widespread use of iambic pentameter - the use of three quatrains followed by a couplet
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noemi is writing an essay on organic foods. she wishes to include prope…
She could summarize the ideas from the source. She could paraphrase the ideas from the source. She could directly quote the ideas from the source.
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which statements describe iambic pentameter as it is used in shakespear…
A. Each line contains five metrical feet. E. In a group of two syllables, the second is stressed.
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summarize: 1) what are the three states that water can exist in? 2) wha…
1) Solid, liquid, gas 2) Hydrologic cycle 3) Condensation 4) Precipitation 5) Heating to make water in the ink evaporate and reveal the message 6) False 7) True 8) Warm, moist air…
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empty mass = 250.0 g filled mass = 1300. g what is the density of the l…
$1.05\ g/cm^{3}$
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what do the symbols tell you about the conditions of the reactions show…
The products and reactants of both reactions are gases; A catalyst is used for reaction 2.
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number of protons equal the number of electrons. sum of the protons and…
Identity: Fluorine Isotope: F - 19 Isotope Notation: $^{19}_{9}F$
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#protons = atomic # = #electrons = 9 #neutrons = mass # = f-19
#Protons = 9 Atomic # = 9 #electrons = 9 #neutrons = 10 Mass # = 19
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complete the missing information. the first one is completed as an exam…
#Protons = 9 Atomic # = 9 #neutrons = 10 Mass # = 19
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questions (use a periodic table): 1. write the isotope notation for an …
1. $_{7}^{14}N$ 2. $_{14}^{28}Si$ 3. $_{19}^{39}K$ 4. Uranium (U) 5. 3 6. 6 7. C - 13 8. 19 9. 197 10. Protons, Neutrons
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atomic structure protons neutrons electrons atomic calculation atomic #…
First row: Atomic \(\#=5\), \(\#\)electrons \( = 5\), \(\#\)neutrons \(=6\), Mass \(\# = 11\) Second row: \(\#\)Protons \(=6\), Atomic \(\#=6\), \(\#\)electrons \( = 6\), \(\#\)ne…
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atoms & isotopes an atom is the smallest particle of an element. atoms …
#Protons = 9 Atomic # = 9 #electrons = 9 #neutrons = 10 Mass # = 19 Identity: F, Fluorine Isotope Notation: $^{19}_{9}F$
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an acid with a ph of 6 has ________ hydrogen ions than pur a) 100 - fol…
B. 10 - fold more
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which of these is hydrophobic? glucose k+ cl- water fat question 18 (1.…
For the first question: Fat For the second question: C. 14 neutrons
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which of the following statements is false? a) larger particles move fa…
A. Larger particles move faster than smaller ones and thus collide frequently and more forcefully.
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triglycerides consist of a 3 - carbon compound called______ and three__…
Question 12: glycerol; fatty acids Question 13: A. Larger particles move faster than smaller ones and thus frequently and more forcefully.
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which functional group is represented by -conh2? amide group carbonyl g…
1. A. Amide group 2. A. Ionic bond
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fill in the following table. | | symbol | name | atomic number | mass n…
| Symbol | Name | Atomic number | Mass number | Charge | Protons | Neutrons | Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | $\ce{_{14}^{28}Si}$ | Silicon…
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determine the correct number of each subatomic particle in an ion of so…
protons: 11 electrons: 10 neutrons: 12
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what is the atomic mass of silicon if 92.21% of its atoms have a mass o…
$28.18$
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the table below gives information about the nucleus of each of four ato…
2
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what does the 218 in polonium-218 represent? o the mass number o the at…
the mass number
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ch.- 16 state government ✦ fill in the blanks. 1. india has ______ stat…
1. 28, 8; Central Government; 25; Question Hour; Governor 2. Member of Legislative Assembly; 30 years; 6 years; Ahmedabad; The official power to make legal decisions and judgments…
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use the image below, which shows an isotope of chlorine, to determine t…
17 protons, 17 electrons, and 18 neutrons
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the atomic number of oxygen, 8, indicates that there are eight protons …
protons in the nucleus of an oxygen atom
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an atom is electrically neutral because nuclear forces stabilize the ch…
the numbers of protons and electrons are equal
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lets focus on logos logos is an appeal to logic. it is a means of convi…
**: Ineffective use of logos. 2. **Explanation**: This is an ineffective use of logos. The premise that everyone has children is false, so the argument based on it is not logical.
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logos is an appeal to logic; it is a means of convincing the audience t…
1. Effective? Yes. Explanation: Valid logical syllogism. 2. Effective? No. Explanation: False premise. 3. Effective? Yes. Explanation: Logical analogy. 4. Effective? Yes. Explanat…
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when comparing convenience diet food to organic foods, we can conclude …
B. that convenience food has more additives
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simple binary ionic compounds please complete the following table: | na…
| Name of Ionic Compound | Formula of Ionic Compound | |--|--| | 1. Sodium bromide | $NaBr$ | | 2. Calcium chloride | $CaCl_2$ | | 3. Magnesium sulfide | $MgS$ | | 4. Aluminum oxi…
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1. (a) (i) what are exotic breeds? (ii) state three advantages of exoti…
(i) The molar mass of $Na_2CO_3$ is $106g/mol$. (ii) The molar mass of $CH_3COOH$ is $60g/mol$.
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a local reaction is when a chemical enters the bloodstream. true false …
B. False
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choose the correct answer. which is a pure substance?
Salt
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choose the correct answer. when fireworks explode, what is happening to…
B. A chemical change
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choose the correct answer. which of the following is considered a physi…
cutting wood into pieces to build a doghouse
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a) the speed of individual molecules b) the mass of the liquid c) the a…
c) Macroscopic property
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choose the correct answer. which element shares similar properties to c…
C. Flourine (F)
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11) in a chemical reaction occurring in a beaker, the beaker and its co…
11. a) True 12. b) System 13. a) True 14. b) The mass of the liquid
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most substances that are not metals look dull. why? they are not ductil…
They lack luster.
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1) an atom is the smallest unit of an element that retains the chemical…
1. a) True 2. c) Oxygen ($O_2$) 3. b) False 4. c) Salt (NaCl) 5. b) False
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if the molecular species has a charge, this must be taken into account …
electrons, electrons
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to complete the lewis structure, electrons are rearranged to make ____ …
Question 18: multiple bonds Question 19: valence electrons
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the valence electrons remaining after the initial bonds are formed are …
Question 16: True Question 17: C. electrons, electrons
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question 14 once we know the number of valence electrons, the atoms are…
Question 14: C. electronegative Question 15: D. covalent bond
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for simple molecules we can write the lewis structures by simply pairin…
1. True 2. valence electrons
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the number of electrons needed to reach an octet determines the number …
- one pair of electrons: single bond - two pair of electrons: double bond - three pair of electrons: triple bond - Question 11: B. double bond
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question 9 the main group nonmetals generally follow the octet rule whe…
transition and inner transition
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main group atoms tend to form bonds such that the bonded atoms have a t…
Question 1: D. octet Question 2: A. True
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question 5 when two diatomic atoms such as chlorine atoms form a diatom…
Question 5: B. share one pair Question 6: A. single bond
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lewis symbols can be used to show the______of electrons during the form…
Question 1: B. transfer Question 2: D. covalent bonds
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the dots for an elements lewis symbol signify the number of ____ presen…
1. valence electrons 2. electrons
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question 23 1 p select the pair of atoms that forms the least polar cov…
B. C-C
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question 21 1 pts a bond where the electrons are shared unequally is ca…
Question 21: C. polar covalent Question 22: D. Si - Cl
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which element listed is the least electronegative? boron chlorine nitro…
1. A. boron 2. C. 8
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question 18 1 pts in which of the following compounds are atoms held to…
B. $NCl_3$ C. $C_6H_{12}O_6$ D. $H_2O$ E. $PCl_3$
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in which of the following compounds are atoms held together by covalent…
B. $NO_2$ C. $C_6H_{12}O_6$ D. $H_2O$ E. $PCl_5$
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in which of the following compounds are atoms held together by ionic bo…
B. $Ag_2O$, C. NaCl, G. $Mg_3N_2$, H. FeS
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what is the formula for the ionic compound composed of aluminum cations…
Question 15: C. $Al_{2}(SO_{4})_{3}$ Question 16: C. $Sn^{4+}$
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question 13 a compound contains an unknown ion x and has the formula xo…
Question 13: D. $Pb^{4+}$ Question 14: B. $SO_3^{2 - }$, C. $NO_3^{-}$, D. $CO_3^{2 - }$, E. $SO_4^{2 - }$, F. $PO_4^{3 - }$
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what must the charge be on the copper ion when it exists as an ionic co…
Question 1: D. 2+ Question 2: C. 2+
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the ion formed by magnesium combines with the ion formed by sulfur in a…
First question: A. 1:1 Second question: E. $Al_{2}O_{3}$
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what is the ratio of aluminum cations to chloride anions in a sample of…
Question 1: B. 1:3 Question 2: A. 14
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the electron configuration for zinc is ____________, while that of the …
1. [Ar]3d$^{10}$4s$^{2}$, [Ar]3d$^{10}$ 2. the simplest whole number ratio of elements present in the substance
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an element with the following electron configuration will gain ________…
1. D. 3 2. C. \([Ar]4s^{2}3d^{10}4p^{6}\), krypton