Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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read the passage from sugar changed the world. no one could have seen i…
Advances in the production of sweeteners hastened the end of involuntary servitude.
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which statement best describes the rhyme scheme of \a thought on the in…
We need the poem text to accurately determine the rhyme - scheme. Without it, we can't select from the given options.
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9. you are heating a piece of glass and now want to pick it up. you sho…
9. C. usar pinzas 10. C. decirle al instructor de ciencias inmediatamente 11. D. Todas las opciones anteriores 12. D. Todas las opciones anteriores 13. D. Ninguna de las opciones …
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which three elements are found in every lipid? some lipids contain addi…
carbon, hydrogen, oxygen
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ch.- 16 state government ♦ fill in the blanks. 1. india has ______ stat…
1. 28, 8 2. Government of India 3. 25 4. Question - Hour 5. Governor 6. Member of Legislative Assembly 7. 30 8. 6 years 9. The official power to make legal decisions and judgments…
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question 1 - 2 hydrogen bonding is responsible for unique properties of…
C. A hydrogen bond forms between the oxygen atom of one water molecule and a hydrogen atom of a different water molecule
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12) use your knowledge of the kinetic molecular theory to explain the f…
(a) Molecules are closely packed with strong forces, vibrating around fixed positions. (b) Molecules can slide past one another due to weaker forces. (c) Water molecules lose kine…
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a characteristic that can be observed or measured without changing the …
A. a physical property
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balancing equations worksheet 1) __h₃po₄ + __koh → __k₃po₄ + __h₂o 2) _…
(1) 1, 3, 1, 3 (2) 6, 1, 3, 2 (3) 1, 1, 1, 1 (4) 10, 2, 6, 1 (5) 4, 1, 4 (6) 4, 1, 2 (7) 2, 5, 2 (8) 2, 3, 1, 6 (9) 2, 1, 1, 2 (10) 1, 1, 1, 1 (11) 4, 1, 2 (12) 2, 3, 1, 6 (13) 16…
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sort the physical science units from first to last. hint: check the syl…
1. Introduction to Physical Science 2. Atoms 3. Matter and its Properties 4. Motion and Forces 5. Momentum, Work, and Energy 6. Heat and Temperature 7. Waves 8. Electricity and El…
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1) the polypropylene cubes have a density of 0.946 grams per milliliter…
A. The cube sinks in methanol because methanol’s density is less than the cube’s density. B. The cube floats on water because the water’s density is greater than the cube’s densit…
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a solution of solids is a(n)___________. heterogeneous mixture alloy pu…
alloy
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a variety of air pollution control devices remove pollutants from indus…
C. wet ESPs
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which of the following is not one of the four common types of potential…
Physical
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which of the following could be described as a reversible change? heati…
when zinc oxide is heated it turns yellow, on cooling it becomes white
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1. a(n) ____________ is a transition from one state of matter to anothe…
B. phase change
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14 of 30 08:30 / 40:00 which of the following is a physical change and …
sugar dissolving in water
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which of the following is a compound? crude oil water neon steel
water
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which part of the atom is neutral and has no charge? the electron the n…
the neutron
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which of the following has a positive charge? the proton the neutron th…
the proton
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which of these is not a homogeneous mixture? o sugar dissolved in water…
oil and vinegar salad dressing
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what is the difference between a homogeneous mixture and a heterogeneou…
A. A homogeneous mixture has a uniform composition, while a heterogeneous mixture does not
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in the chemical reaction shown below, how do you classify hydrogen and …
B. reactants
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bellwork, day 3: eview of the atomic size trend\ directions: please ans…
1. New electron - shells are added as you go down a group, increasing the atomic size. 2. Increased nuclear charge pulls electrons closer across a period, decreasing atomic size. …
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which one is not a sign of chemical change gas release melting ice crea…
melting ice cream
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question 2 of 22 write a molecular formula for this molecule. molecular…
$C_{17}H_{14}O_{3}$
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and rattles at the windows in a vicious spate. theres a crashing of a s…
rhyme scheme
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in the chemical reaction shown below, what is the beginning mass of mer…
216 grams
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fill in the missing words sodium bicarbonate is one of the compounds us…
0.00387; 0.00387; 310.15; 0.104
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copper is made of atoms an atom is the smallest part of an element. ato…
a copper atom
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1. periods are ____________ on the periodic table. left to right diagon…
C. horizontal rows
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there are different types of atoms. everything is made up of the atoms …
Bromine atoms
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question 1 1 pts 1. which statement describes a major difference betwee…
B. A traditional poem may contain regular meter and rhyme scheme, but a free verse poem does not contain these elements.
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9. triglycerides which are... a. solid at room temperature are called \…
a. Fats b. Oils
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there are different types of atoms. everything is made up of the atoms …
Selenium atoms
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the volume of hydrogen gas is twice the volume of oxygen gas. what is t…
More information is required.
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silver is made of atoms. an atom is the smallest part of an element. at…
a silver atom
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which is a characteristic of colloids? are homogeneous mixtures have la…
are made up of at least two substances
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there are 118 different elements listed on the periodic table. what is …
an atom
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eli states that sodium phosphate is a mixture because it is composed of…
It is incorrect because sodium phosphate is a compound that has a single composition.
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which of the following atmospheric pollutants are likely to react with …
B. nitrogen oxide (NO), C. sulfur dioxide ($SO_2$)
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what is the correct classification of a mixture in which both a solid a…
a heterogeneous mixture and a suspension
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3) calculate the average atomic mass of lithium (li), which occurs ⁶li …
$6.927$ amu
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which material is the least likely to be recognized as a mixture by loo…
a homogeneous mixture
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maria examines a mixture that appears to be the same throughout. howeve…
The mixture is a colloid because two different substances can be seen in a small sample.
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3. when one substance changes identity, it exhibits a(n) ____________. …
chemical property
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if you were able to cut this bar of gold over and over until you have t…
an atom of gold
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a chemical reaction is the only way to separate a(n) element pure subst…
pure substance
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check all appropriate safety precautions for handling each of t hydroch…
Wear chemical resistant gloves.
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question 1 of 22 in the given depiction of a substance, each sphere rep…
chemical formula: $Cl_2$ state of matter: gas
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which would most likely form a homogeneous mixture? 10 marbles mixed wi…
a pinch of sugar mixed with a cup of water
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hana fills a cup with sandy ocean water. she pours the mixture through …
B. a solution of salt in water
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dominic made the table below to organize his notes about mixtures. prop…
Although it is possible to have more than one state, it is also possible to have only one state.
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which is a property of every mixture? one substance dissolves in anothe…
One substance can be separated from another through physical means.
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a group of scientists is researching a substance that improves the safe…
Research conditions in which hydrogen can be stored in a liquid
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lars is balancing equations with his study group. he is unsure about on…
B. $3Ca(OH)_2 + 2H_3PO_4 ightarrow Ca_3(PO_4)_2+6H_2O$
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2. write a balanced chemical equation to represent each reaction descri…
(a) $4Al + 3O_2=2Al_2O_3$ (b) $Zn + S = ZnS$
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when balanced, which equation would have the coefficient 3 in front of …
$H_{2}SO_{4}+B(OH)_{3} ightarrow B_{2}(SO_{4})_{3}+H_{2}O$
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do now 1. classify the changes involved in the following processes as p…
(a) C (b) P (c) C (d) P (e) C
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how is energy related to the change of state represented by the model? …
Atoms gain energy as a solid changes to a gas
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the equation for water is h₂ + o₂ → h₂o. to balance the equation, which…
B. 2
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marco wants to investigate the chemical properties of sodium bicarbonat…
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
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during which changes of state do atoms that cannot move past one anothe…
C. sublimation and melting
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read the passage and the thesaurus entry. from how sammy went to coral …
4. The Hermit is hiding his true intentions from Sammy.
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two sources discuss the source of natural and synthetic emeralds. sourc…
less environmental and health - related
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chapter 11: skill - builder due sep 14 by 11:59pm points 10 submitting …
134.4
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what happens to the total mass of a substance undergoing a physical cha…
It stays the same.
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according to the lab guide, which changes below will you look for in or…
changes in shape or size, color changes, whether changes are easily reversible, temperature changes, formation of precipitates or gases, changes of state (gas, liquid, or solid)
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2. write a balanced chemical equation to represent each reaction descri…
(a) $3Ag + Au(NO_3)_3=3AgNO_3 + Au$ (b) $Cu + PbSO_4=CuSO_4 + Pb$
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which property of physical changes explains why matter is conserved in …
The bonds between atoms do not break; it is only the arrangement that changes.
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read the sentence. 1 alejandros guidance counselor is helping him plan …
sentence 3
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an amount of nitrogen undergoes a physical change and increases its vol…
The density changed.
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read the paragraph. 1 alejandros guidance counselor is helping him plan…
sentence 4
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which example illustrates a chemical change? shredding paper smashing a…
burning wood
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comparing relationships in a table acidity changes after dry ice is add…
The pH of solution A decreases, and the pH of solution B decreases.
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which ranks these materials by the attraction between their atoms from …
A. oxygen gas, liquid water, liquid honey, solid iron ore
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hypothesis: if a material undergoes a chemical change, then it will not…
properties before the chemical - change; properties after the chemical - change
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2. write a balanced chemical equation to represent each reaction descri…
(a) $3Ag + Au(NO_3)_3=3AgNO_3 + Au$ (b) $Cu + PbSO_4=CuSO_4 + Pb$
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question 10 1 pts your professor announces that you will have a guest s…
schemas
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hypothesis: if a material undergoes a chemical change, then it will not…
properties before the chemical change; properties after the chemical change
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two sources discuss the source of natural and synthetic emeralds. sourc…
a positive
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question 6 1 pts rigid schema help increase self - esteem. true false
False
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an atom contains 70 protons, 70 electrons, and 99 neutrons. what is the…
169
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a. which type of matter can the magnetic filings be classified as? expl…
a. Solid; they have definite shape and volume and are made of closely - packed particles. b. From the start when sand and magnetic filings were combined; it is a combination of su…
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3. a. for cyclohexane, explain how chair conformations and axial/equato…
a. In cyclohexane's chair - conformation, axial substituents can cause 1,3 - diaxial interactions leading to steric strain, while equatorial substituents have less steric hindranc…
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which of these elements has the smallest atomic number? zr (zirconium) …
Mn (manganese) H, Sb, Tc, C
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an isotope is different versions of the same element with a different n…
C. Neutrons
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how would you describe the nucleus? dense and positively charged tiny a…
Dense and positively charged, Neutrons
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use the chart below to identify atoms, ions, and isotopes. which elemen…
Which element is an ion with a +1 charge? Lithium Which element is an ion with a -2 charge? Sulfur Which element is a neutral atom? Potassium Which element is an ion with a -1 cha…
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two examples of energy transformations are shown. the energy transforma…
result in radiant energy
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which symbol below correctly identifies an element with 16 protons, 18 …
d. \(_{16}^{34}S^{-2}\)
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question 4 multiple choice worth 4 points which piece of laboratory equ…
C. Mortar and pestle
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1. balance each equation for a single replacement reaction. (a) k + h₃p…
(a) $6K + 2H_3PO_4 ightarrow 2K_3PO_4+3H_2$ (b) $2Fe + 3H_2S ightarrow Fe_2S_3 + 3H_2$ (c) $Cl_2+MgBr_2 ightarrow MgCl_2 + Br_2$ (d) $Cu+Ag_2CO_3 ightarrow CuCO_3 + 2Ag$ (e) $Br_2…
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this lab question is: how can you distinguish a physical change from a …
All of the statements are appropriate hypotheses. 1. If a substance changes state of matter (e.g., liquid to gas), then this is a physical change because original properties of th…
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76. which of the following are the same and which are different? a. a s…
a. Son lo mismo. b. Son diferentes. c. Son diferentes. d. Son lo mismo.
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how can you distinguish a from b? in this lab, you will do experiments …
How can you distinguish a physical change from a chemical change?
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question 3 (multiple choice worth 4 points) (01.04r mc) the table compa…
It is a gas because the particles of the substance have the highest speeds.
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58. name the elements contained in the following compounds. a. sodium c…
a. Sodio (Na), Cloro (Cl) b. Nitrógeno (N), Hidrógeno (H) c. Carbono (C), Hidrógeno (H), Oxígeno (O) d. Bromo (Br)
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newman projection analysis: draw a newman projection along the c3 - c4 …
a. Newman projection: Draw a dot for C3 with its attached groups (hydroxyl and alkyl) and a circle for C4 with its attached groups (hydroxyl and alkyl) arranged according to their…
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dimensional analysis (unit factor method) using this method, it is poss…
1. 10800 2. 0.0035 3. 12.128 4. 90 5. 11388 6. $1.806\times 10^{24}$ 7. 4.153 8. 112 9. 4.464 10. $1.344\times10^{24}$ 11. 186.054 12. 7.5