化学
化学反応、化学量論、分子構造、元素の性質。
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the passage below describes an experiment. read the passage and then fo…
Does rock candy grow larger when it is made with white sugar or brown sugar?
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the passage below describes an experiment. read the passage and then fo…
Do steel nails take fewer days to rust in water compared to vinegar?
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question 25 multilevel facilities* refers to facilities that a provide …
Question 25: A. provide multiple levels of care Question 26: B. False
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cancer that has metastasized cannot be removed. what is the option to t…
chemotherapy
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what is the primary concern when administering chemotherapy to cancer p…
overdosing
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what is one of the only ways to treat cancer that has metastasized? tra…
chemotherapy
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what is the primary concern when administering chemotherapy to cancer p…
overdosing
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a bakery has developed a new artisan bread. the staff are giving away t…
Measure sales of the new bread after customers have sampled it. Observe customer reactions while they taste the product.
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based on this mass spectrum, what is the average atomic mass of element…
\(32.07\ \text{amu}\) (Option B)
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how many neutrons are in the niobium isotope $_{41}^{92}nb$? neutrons
51
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which statement is true about the relative masses of subatomic particle…
C. Neutrons have a much larger mass than electrons.
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select the correct text in the passage. which detail best supports the …
"Statesmanship is not an abstract skill, but a contextual one, highly specific to the circumstances it finds"
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the element calcium plays an important role in the human body, helping …
\(20\)
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quiz 1 google classroom of microsoft teams of what is the mass number o…
B. the sum of the number of protons and neutrons
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the element sodium has an atomic number of 11 and an average atomic mas…
- amu: atomic mass unit. - Isotope: sodium - 23.
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silicon has three stable isotopes: si - 28, si - 29, and si - 30. the f…
\(28.109\)
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what is the mass number of the uranium isotope with 140 neutrons? mass …
\(232\)
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which pair of atoms are isotopes of the same element? choose 1 answer: …
A. \(_{7}^{13}X\) and \(_{7}^{14}X\)
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state the chemical equation for the following nitric acid hydroiodic ac…
- Nitric Acid: \(HNO_3\) - Hydroiodic acid: \(HI\) - Acetic acid: \(CH_3COOH\) - Baking soda: \(NaHCO_3\)
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naturally occurring thallium is composed mainly of two isotopes. tl - 2…
A.
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how many neutrons are in the silicon isotope $_{14}^{31}si$? neutrons s…
17
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complete the statement. isotopes are atoms that have______. choose 1 an…
B. the same number of protons and a different number of neutrons
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the notation for an isotope of oxygen is shown below. match each part o…
- \(\text{O}\): chemical symbol - \(8\): atomic number - \(16\): mass number
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complete the rhyme scheme. a b b b c d so with the stretch of the white…
A, B, B, B, C, D
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the element titanium has five naturally occurring isotopes. what inform…
A. the atomic mass of each isotope, C. the relative abundance of each isotope
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what is the mass number of an isotope equal to? choose 1 answer: the nu…
A. the number of protons plus the number of neutrons
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the element xenon is commonly used to propel satellites and other space…
54
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the element sulfur is a key component of many proteins in the human bod…
\(16\)
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which subatomic particles are found in the nucleus of an atom? choose 2…
B. neutrons, C. protons
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match each subatomic particle to its charge. particle charge proton 0 n…
proton - \(1+\), neutron - \(0\), electron - \(1-\)
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what determines the identity of an element? choose 1 answer: the number…
C. the number of protons in its atoms
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which statement is true about the relative masses of subatomic particle…
B. Protons have a much larger mass than electrons.
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7. what element of baroque art often evokes heightened emotions in view…
d. Exaggerated gestures
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reaction stoichiometry involving gases consider the chemical reaction: …
\(38.5\space L\)
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which aspect of berninis work greatly influenced the baroque period? a.…
C. Dramatic realism
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which scientist discovered that elements could be grouped into \triads\…
Johann Döbereiner
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dmitri mendeleev created an early version of the periodic table based o…
atomic number.
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what are synthetic chemicals? chemicals found in products that can caus…
chemicals found in products that can cause mutations
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classify each substance as element, compound, homogeneous mixture, and …
1. Elemento 2. Compuesto 3. Mezcla heterogénea
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use the labels to summarize the particle model. identify how the energy…
solids: least particle movement, least energy, attractive forces hold them in fixed positions. liquids: attractive forces keep them near one another. gases: most particle movement…
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question 10 identify the state of matter in which particles have the mo…
Gas
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question 4 (10 points) the process whereby some yeasts act on sugar in …
- Question 4: A. fermentation - Question 5: (Assuming the correct option is “twice” which is not shown in the provided options for question 5. But if we go by the relation proof \…
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question 6 most of the water on mars is frozen solid. if you were analy…
The particles would be closely packed together in a regular, fixed arrangement. They would vibrate in fixed positions due to the strong intermolecular forces holding them in place…
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read the sentence. 1 alejandros guidance counselor is helping him plan …
sentence 3
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read the paragraph. 1 alejandros guidance counselor is helping him plan…
sentence 3
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question 3 this video shows particles that are far apart and moving qui…
For Question 3: Gas. For Question 4: Gas - state particles are far apart and move freely and quickly, which matches the description in the video.
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question 3 this video shows particles that are far apart and moving qui…
Gas
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question 2 select the option that best completes the following sentence…
far apart and moving fast
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how are particles arranged? en english (us) question 1 select the optio…
close together and vibrating, and held in position
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as the leader of iraq in the 1990s, saddam hussein ruled during a peace…
used chemical weapons against his own people.
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3rd attempt calculate the solubility of argon in water at an atmospheri…
\(5.75\times 10^{-6}\ mol/L\)
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when is the overall free energy change δg in a reaction most likely to …
When products have lower potential energy and higher entropy than reactants.
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ionization energy is... the energy required to add an electron to a spe…
"how much energy it takes to remove an electron from an atom"
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electronegativity ____________ from left to right within a period and _…
increases, decreases
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atoms that have a high electronegativity, ______________. give up their…
hold on to their electrons more tightly.
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which of the following will have a higher electronegativity than arseni…
Carbon (C)
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as atoms of elements in group 16 are considered in order from top to bo…
decreases
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which of the following will have a lower ionization energy than scandiu…
Calcium (Ca)
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how do clastic sedimentary rocks form? solid chemicals in water harden …
Fragments of rock are squeezed and cemented together.
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how does sediment form? molten rock cools below earths surface. loose m…
Weathering breaks down rock and other materials.
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how does sediment form? molten rock cools below earths surface. loose m…
Weathering breaks down rock and other materials.
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question 3 of 5 a 6 - year - old child who has been undergoing treatmen…
The child will have no chance to survive this leukemia in the long term.
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which of the following is a type of energy that is not involved in huma…
- First question: nuclear energy - Second question: thermal or kinetic
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compound - is a substance formed when two or more chemical elements are…
molecule
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notes there are 2 types of \pure substances\ element - a substance that…
atom
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jadas problem and solution essay includes the following thesis statemen…
Due to the skyrocketing numbers of European Starlings across the United States, damage to crops and the spread of invasive seeds are increasing.
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question 12 1 pts the part of the sensory pathway that projects a sensa…
Question 12: sensory area in the brain Question 13: False
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the part of the eye that regulates the size of the pupil is the: o extr…
1. iris 2. mechanoreceptors
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active chemicals found in cigarettes, tea, coffee, and soft drinks are …
- First question: stimulant - Second question: All of the choices
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who is it? tell what element.
Beryllium (\(Be\)), Aluminium (\(Al\)), Iron (\(Fe\))
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japanese haiku are similar to english romantic poems because they both …
follow a fixed structure.
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2 write down if the description is a metal, nonmetal, or metalloid in t…
| Description | Metal, Nonmetal, or metalloid | Description | Metal, Nonmetal, or metalloid | |---|---|---|---| | Shiny | Metal | Zig - zag | Metalloid | | Semiconductor | Metallo…
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1 fill in the chart dont forget: ape man a = p = e m - a = n
|Element|Symbol|Atomic Number|Mass Number|Protons|Neutrons|Electrons|Columns (Groups, Families)|Rows (Periods)|Metal, Nonmetal or Metalloid| |---|---|---|---|---|---|---|---|---|-…
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10. calculate what is the difference expressed in kilograms between the…
\(1.67168906\times 10^{-27}\space kg\)
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chemical energy is a form of ____ energy. entropic kinetic heat potenti…
potential
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\conservation of energy\ refers to the fact that ___. the net amount of…
energy cannot be created or destroyed but can be converted from one form to another
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electrons tend to have more potential energy when ____. see section 8.1…
they are in electron shells far from the nucleus
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if you were to expose glucose to oxygen on your lab bench, why would yo…
Activation energy is required for the sugar and oxygen to reach their transition state.
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8 parts of 1 point which of these is exhibiting kinetic energy? an arch…
a space station orbiting Earth
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question 3 when you add an unknown fatty acid to stearic acid, the free…
B. will decrease
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9. compare the relative charge and mass of each subatomic particle.
Protons: charge +1, mass 1; Neutrons: charge 0, mass 1; Electrons: charge -1, mass ≈1/1836.
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question 2 which of the following concentration units are temperature d…
A. Molarity
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how does an increase in thermal energy affect molecules? they stop movi…
They begin to vibrate more.
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question 1 which of these is not a colligative property? a) boiling poi…
C. Enthalpy
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11. a mixture of copper and tin is called a. brass. b. amber. c. platin…
D. bronze
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question 10 1 pts a metal (m) forms an oxide with the formula mo. if th…
magnesium
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question 9 1 pts a compound has the following percent composition: carb…
\(C_8H_{10}N_4O_2\) (the second option)
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question 7 1 pts a compound is analyzed and found to contain 68.54% car…
\(C_{4}H_{6}O\) ### Question 8
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question 5 1 pts what is the empirical formula for glucose? c3h6o3 c6h1…
\(CH_2O\) ### Question 6
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question 3 1 pts calculate the percent composition of hydrogen in ammon…
\(11.8\%\) (the fourth option)
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calculate the percent composition of hydrogen in ammonium sulfide. 10.1…
\(92.3\space g\)
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question 1 1 pts calculate the percent by mass of hydrogen in methane, …
25.1% # Question 2 ## Step1: Calculate molar mass of \(C_6H_{12}O_6\) Molar mass of \(C = 12.01\space g/mol\), molar mass of \(H = 1.008\space g/mol\), molar mass of \(O=16.00\spa…
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given the data below, what is the standard enthalpy of formation of cf₄…
\(-680\space kJ/mol\)
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combining aqueous solutions of bal₂ and na₂so₄ affords a precipitate of…
Na⁺ and I⁻ # Question 15
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question 12 1 pts which reaction is not an example of a redox reaction?…
\(2(NH_4)_3PO_4(aq)+3Ba(NO_3)_2(aq)\to Ba_3(PO_4)_2(s)+6NH_4NO_3(aq)\) ### Question 13
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question 10 1 pts which of the following is an oxidation - reduction re…
\(2KClO_{3}(s)\to2KCl(s) + 3O_{2}(g)\), \(C_{6}H_{12}O_{2}(l)+8O_{2}(g)\to6CO_{2}(g)+6H_{2}O(g)\), \(Mg(s)+2HCl(aq)\to MgCl_{2}(aq)+H_{2}(g)\) # Question 11
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question 8 1 pts which of the following is an oxidation - reduction rea…
\(Cu(s)+2AgNO_3(aq)\to2Ag(s)+Cu(NO_3)_2(aq)\) # Question 9
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question 6 1 pts when aqueous solutions of ______ are mixed, a precipit…
\(NiBr_{2}\) and \(AgNO_{3}\) ### Question 7
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question 5 1 pts which of the following is insoluble in water at 25 °c?…
\(Mg_{3}(PO_{4})_{2}\)
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question 4 1 pts the net ionic reaction for the balanced equation shown…
\(3Ca^{2 + }(aq)+2PO_4^{3 - }(aq)\to Ca_3(PO_4)_2(s)\) (the fourth option)