化学
化学反応、化学量論、分子構造、元素の性質。
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reasoning about freedom of movement (continued) dr flores wants to know…
Claim 2: Molecules in a substance move differently when a substance changes phase.
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in what way are the lines of the weary blues similar to the lyrics of a…
The poem uses repetition to create meaning.
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9. what is the correct name for a compound with the chemical formula pn…
D. Phosphorus mononitride
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9. what is the correct name for a compound with the chemical formula pn…
A. Phosphorus nitride
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question 1 mark this question which of the following design elements is…
Playful animations
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which has the largest atomic radius? * li ca n f i how can i(your teach…
Ca
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which element has the highest ionization energy? * mg ba o te which has…
1. \(O\) (for the highest ionization energy question) 2. \(O\) (for the smallest atomic radius question) 3. \(Cs\) (for the smallest ionization energy question)
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how are the trends for atomic size and ionization energy related? * the…
- First question: They have opposite trends - Second question: The second electron needs more energy - Third question: Number of neutrons
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what is ionization energy?*energy needed to remove electronsenergy need…
- For "What is ionization energy?": Energy needed to remove electrons. - For "What is a correct trend for ionization energy?": It decreases when you go down a group. - For "What h…
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email * record cval1543@atu.guad.net as the email to be included with m…
- First question: Atoms combine to form bigger compounds - Second question: Change the electrons
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\let america be america again\ by: langston hughes directions: read and…
1. The poem is addressed to America as a whole. 2. The founding ideals of America (freedom, equality, opportunity) are addressed by showing the contrast between the ideal ("Let Am…
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name _ date _ period _ ph exit ticket directions: read each question ca…
1. The acidity or basicity (alkalinity) of a solution 2. pH 13 3. Neutral 4. Salt & Water 5. It will be closer to pH 0
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welding use the information below to answer the question. when consider…
construction
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7. a student performs an experiment to determine the density of a sugar…
C. Her results are both precise and accurate.
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5. to observe the effects of how different metals react, the students s…
A. A and B or E and F
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when baking soda is added to vinegar, the solution produces a gas (carb…
B. Adding more baking soda than \(2.0g\) does not result in additional gas production.
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2. read the passage and then select the list of words that correctly co…
B. mass; element; molecule; state
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a proton is a subatomic particle carrying a charge equal to but opposit…
- First question: True - Second question: Atomic number
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which statement is true according to modern atomic theory?* isotopes, a…
Isotopes, atoms of the same element, may have different mass numbers.
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looking at silver (ag) in the periodic table of elements, what does 107…
Atomic mass
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which atomic particle has about the same mass as a proton but has no el…
neutron
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an aluminum isotope consists of 13 protons, 13 electrons, and 14 neutro…
27
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which conclusion can be drawn from the rutherford gold foil experiment?…
An atom contains a centrally - located, positive region surrounded by negative electrons.
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question 7 (2 points) saved listen question 7) acetone, an ingredient i…
Dipole - Dipole
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11. what is the mass of 30,000 molecules? express your answer in scient…
\(1.59\times 10^{-18}\text{ gram}\)
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which of these is a covalent compound? ○ mgo ○ alcl₃ ○ co ○ licl
CO
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in the formula for water (h₂o), what does the subscript 2 indicate? ○ t…
two hydrogen atoms in the compound
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which formula represents a covalent compound? nacl cao mgs h₂o₂
\(H_2O_2\)
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which formula is an ionic compound? naf n₂ no₂ co₂
NaF
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2 multiple choice 5 points which of the following correctly completes t…
Smaller
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1 multiple choice 5 points what element on the periodic table has the h…
F
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sodium (na) and iodine gas (i₂) react to form sodium iodine (nai). whic…
\(2Na + I_{2}\to2NaI\)
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which equation is balanced? mg + 2o₂ → 2mgo al + 3o₂ → al₂o₃ na + f₂ → …
2Al + 3F₂ → 2AlF₃
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what needs to be done in order to balance the equation? place a 2 in fr…
Place a 2 in front of the \(Ca\) and the \(CaO\).
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3.05 quiz: chemical equations due: thu oct 23, 2025 11:59pm attempt 1 i…
Only the O is unbalanced.
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identifying safety protocol for the lab experiment which statements are…
Wear a lab coat and safety goggles when performing an experiment, Use caution when connecting electric circuits, Do not drop the magnets, Do not bring bar magnets near magnetic de…
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what does the law of conservation of mass state? mass can be destroyed …
Mass cannot be created nor destroyed in a chemical reaction.
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question 25 (4 points) chlorine (cl) is a/an a) alkaline earth metal b)…
C. halogen
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question 24 (4 points) where in the lab should chemical waste be proper…
D. In the specially designated chemical waste disposal area
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how does the law of conservation of mass apply to this reaction mg + 2h…
The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.
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question 23 (4 points) given that zinc reacts with iodine in the fixed …
B) \(16.3\ g\)
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how does the law of conservation of mass apply to this reaction: $c_{2}…
The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.
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identifying electric fields which object represents a negatively charge…
- Negatively charged particle: \( B \) - Positively charged molecule: \( A \) - Uncharged molecule: \( C \) - Object that will not move in an electric field: \( C \)
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in the reaction 4al+ _ o₂ → 2al₂o₃, what coefficient should be placed i…
3
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in the reaction _h₂ + n₂ → 2nh₃, what coefficient should be placed in f…
3
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7. which two subatomic particles are located in the nucleus of an atom?
Protons and neutrons.
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this is the chemical formula for diethyl ether: $(ch_{3}ch_{2})_{2}o$. …
\(14\%\)
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which statement below accurately describes the contributions of thomson…
discovered the evidence of electrons
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the atomic mass unit is defined as: the mass of the hydrogen atom conta…
1/12 the mass of a carbon atom containing six protons and six neutrons.
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which statement below accurately describes the contributions of dalton?…
proposed the modern Atomic Theory
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protons and electrons each have a mass of 1 amu. true false
False
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the charges on electrons and neutrons cancel each other to give neutral…
False
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all of the positive charge of an atom is concentrated in the nucleus. t…
True
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the plum pudding model proposed that negatively charged electrons were …
True
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6. the nucleus contains protons and neutrons. 7. electrons move around …
energy
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which of the following is not part of daltons atomic theory? atoms comb…
B. Most of the atom’s mass and all of its positive charge is contained in a small core called the nucleus.
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the nucleus of an atom is a very small, dense region that contains over…
True
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an atom containing 7 protons, 8 neutrons, and 7 electrons: o is charge-…
Is charge - neutral.
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an atom containing 8 protons, 9 neutrons, and 8 electrons would be cons…
False
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which statement below is not consistent with the nuclear theory of the …
Electrical charge is a fundamental property of protons and electrons in which like charges repel and opposite charges attract.
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which statement below accurately describes the contributions of democri…
ancient Greek philosopher who proposed that matter was not continuous
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the atom is the fundamental building block of everything we hear, feel,…
True
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john dalton formalized an atomic theory that gained acceptance in the e…
True
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which of the following ph values is consistent with a neutral solution?…
B. 7
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5. which elements are in the alkali metals group of the periodic table?…
potassium, sodium
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a chemical reaction occurs when the bonds in a compound are broken apar…
d. Hydrolysis
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4. to which group does copper belong? alkaline earth metal transition m…
transition metal
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3. which group in the periodic table consists of the alkaline ear 1 13 …
2
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2. which type of element has properties that are intermediate between m…
metalloids
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which of the following terms refers to a type of chemical reaction wher…
d. Decomposition reaction
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unit 1 - challenge 1.2: the chemical level which of the following bonds…
A. Polar covalent bonds
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1. which elements are noble gases? select all that apply. krypton neon …
krypton, neon, argon
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isotopes are one of multiple versions of an atom with different mass nu…
A. Neutrons
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lemonade contains lemon juice and sugar dissolved in water. what is the…
A. water
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unit 1 - challenge 1.2: the chemical level of organiz which of the foll…
C. Atom
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in the lab, gregory is using a substance that has the same composition …
D. solution
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cracker jacks contain peanuts and popcorn. eve hates peanuts, so she pi…
D. mixture
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a solution of ethanol (c₂h₅oh) in water is prepared by dissolving 50.0 …
\(3.43\)
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beryllium appears on the periodic table with the symbol be. it may bond…
A. element
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sulfur dioxide is a smelly, toxic gas. it is made of the elements sulfu…
B. compound
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to form brass, copper and zinc combine but do not chemically bond. bras…
D. mixture
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which of the following describes a heterogeneous mixture? choose one op…
C. beach sand, a substance that can contain rocks, shells, metals and other substances distributed unevenly throughout
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mixtures that have the same composition throughout are _________. choos…
B. homogenous
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unlike an element, a(n) ______ may be separated through a physical proc…
A. mixture
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what color is a universal indicator in an acidic solution? yellow green…
Red
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quiz question 1 of 10 which two types of matter are pure substances? ch…
C. elements and compounds
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drag the missing word into place is everything that takes up space and …
Matter
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drag over the word that goes best with the image
solvent
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complete the following table. mass of sample moles of sample molecules …
| Mass of Sample | Moles of Sample | Molecules In Sample | Total Atoms In Sample | | --- | --- | --- | --- | | \(4.05\ g\ C_6H_6\) | \(0.0518\) | \(3.12\times 10^{22}\) | \(3.74\t…
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you need to make 120.0 ml of a 0.65 m nacl solution. you have solid nac…
(a) \(4.56\space g\) (b) \(27.9\space mL\)
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select all the true statements about general lab rules. do not touch eq…
- Do not touch equipment, chemicals or materials until instructed to do so - Do not work alone in the lab - Keep aisles and counters clear of unnecessary materials
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which of the following face and eye protection provides the minimum lev…
Safety glasses
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select all the true statements about general lab rules. do not touch eq…
- Do not touch equipment, chemicals or materials until instructed to do so - Do not work alone in the lab - Keep aisles and counters clear of unnecessary materials
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8 of 20 usually have ventilation holes along the side which makes the w…
Impact goggles
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in this graph, what represents activation energy? the black double - he…
The black double - headed arrow at the transition state.
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question 4 10 pts what is the name of the following compound: cu₂o
Copper(I) oxide
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which of the following formulas is incorrect? aioh3 (nh4)2s naoh ai2(so…
\(AlOH_{3}\)
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question 2 1,000 pts ionic bonds form because... two or more atoms shar…
Two ions of different charges are attracted to each other.
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examine each of the formulas and the polyatomic ions referenced to the …
KNO₃, potassium nitrate
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10. which of these is an example of a molecule? a. oxygen-o₂ b. salt-na…
1. Element 2. M 3. C 4. A 5. Element