化学
化学反応、化学量論、分子構造、元素の性質。
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choose the correct answer. is air a homogeneous or heterogeneous mixtur…
homogeneous
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choose the correct answer is this mixture of stones homogeneous or hete…
heterogeneous
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the birdseed in this image is a mixture of several different types and …
heterogeneous
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when a mixture is created, are new molecules formed? yes no
no
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choose the correct answer. what is a mixture? when a chemical reaction …
two or more substances combined
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new and interesting research conducted by suleiman a. al - sweedan and …
B. sporadic
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an irregularly shaped stone was lowered into a graduated cylinder holdi…
g/mL
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choose the correct answer. which household chore is a physical change? …
Folding laundry
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what are physical changes of matter? changes that make new molecules ch…
changes that do not make new substances
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choose the correct answer. which is a physical change? baking brownies …
Folding paper
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how can you tell if a physical change has occurred? the composition of …
The composition of the substance has not changed.
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choose the correct answer. which of these is not a physical change? bre…
burning a candle
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choose the correct answer. why is ice melting considered to be a physic…
the water molecules do not change chemically and are still H2O
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choose the correct answer which of these is a physical change? rust is …
an object is cut into pieces
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choose the correct answer. which of these is a physical change? somethi…
water freezes
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choose the correct answer. why is cutting a piece of paper considered a…
even though the paper is in smaller pieces, each piece is still paper
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choose the correct answer. which of these are physical changes? cutting…
cutting, tearing, freezing, thawing, folding, mixing without chemical changes
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7. which of the following physical characteristics is the same for a pa…
7. d. Melting point 8. a. Density 9. d. Stir the pile into a bowl of water, and then pour the water out of the bowl.
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social studies 7- async: section 1-7(lms) quiz: the distant past (lms g…
B. the things that people in the past left behind
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4. the table below shows a scientist has a sample of metal that could b…
4. b. Density 5. d. Salts 6. b. Ball B
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4. the table below shows some of the properties of two metals. a scient…
8. d 9. b
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2. what shape does a water molecule have? draw what you think a water m…
A water molecule has a bent (V - shaped) geometry. The drawing would show an oxygen atom in the center with two hydrogen atoms bonded to it at an angle and two lone pairs of elect…
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what class of elements do the highlighted elements below belong to? a. …
B. Metals
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1. what is polarity? what about a water molecule makes it a polar molec…
Polarity is the separation of electric charge in a molecule creating a dipole moment. In a water molecule, oxygen's high electronegativity and the bent molecular geometry make it …
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what name is given to the following elements shown in group 1? a. alkal…
A. Alkali metals
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level 5 what is not a characteristic of the alkaline earth metals? a. s…
D. None of the above
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level 4 what is not a characteristic of the noble gases? a. they have c…
A. They have colored vapors
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level 2 what does the number \15.999\ represent in this symbol? a. numb…
D. Atomic mass
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what does the number \6\ represent in this symbol? a. number of electro…
C. Atomic number
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level 1 q3 what are the horizontal rows of the periodic table called? a…
C. Periods
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level 3 what family in the periodic table does neon belong to? a. alkal…
C. Noble gases
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level 1 what are the vertical columns of the periodic table called? a. …
D. Groups
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18. eating too much fat causes weight gain. mark only one oval. true fa…
18. True 19. True 20. False 21. True 22. True
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level 1 what scientist created the periodic table that we still use tod…
B. Dmitri Mendeleev
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level 5 what is not a characteristic of the halogen family? a. they are…
B. Good conductors of heat
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the newspaper headline below was published in the early 1900s. ferry fl…
Flagler's ability to construct the railroad increased Florida's ability to trade.
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24 mark for review administrators at a state university computed the me…
C. Yes. It could happen. Whether it does happen depends on the number of juniors and seniors in each major.
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what molecule is responsible for drunkenness? acetone hydrogen ethanol …
Ethanol
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use the periodic table to identify the number of core electrons and the…
10 core electrons 2 valence electrons
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use the periodic table to identify the number of core electrons and the…
core electrons: 10 valence electrons: 8
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use the periodic table to identify the number of core electrons and the…
core electrons: 18 valence electrons: 8
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use the periodic table to identify the number of core electrons and the…
core electrons: 18 valence electrons: 1
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choose the electron configuration for sodium (na) in both longhand nota…
Longhand notation: $1s^{2}2s^{2}2p^{6}3s^{1}$ Noble - gas notation: [Ne]$3s^{1}$
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choose the electron configuration for sodium (na) in both longhand nota…
1s²2s²2p⁶3s¹
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identify whether longhand notation or noble - gas notation was used in …
Potassium (K): longhand notation Argon (Ar): noble - gas notation Iron (Fe): noble - gas notation
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identify whether longhand notation or noble - gas notation was used in …
Potassium (K): longhand notation Iron (Fe): noble - gas notation
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identify whether longhand notation or noble - gas notation was used in …
longhand notation
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brazen bells! what a tale of terror, now, their turbulence tells! in th…
1. Alliteration 2. Onomatopoeia 3. No specific rhyme scheme
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part 2: classify each of the following as elements (e), compounds (c) o…
Diamond: E Sugar: C Milk: M Iron: E Air: M Sulfuric Acid: C Gasoline: M Electricity: X Krypton: E Bismuth: E Uranium: E Popcorn: M Water: C Alcohol: C Pail of Garbage: M A dog: X …
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use the periodic table in the tools bar to complete the electron - conf…
$H = 2$ $I = 2$ $J = 2$
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part 1: read the following information on elements, compounds and mixtu…
Diamonds (C): E Sugar ($C_{6}H_{12}O_{6}$): C Milk: M Iron (Fe): E Sulfuric Acid ($H_{2}SO_{4}$): C Gasoline: M Electricity: X Nitrogen (N): E Bismuth (Bi): E Uranium (U): E Popco…
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use the periodic table in the tools bar to complete the electron config…
$E = 2$ $F = 2$ $G = 1$
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use the periodic table in the tools bar to complete the electron config…
C = 2 D = 2
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use the periodic table in the tools bar to complete the electron config…
A = 2 B = 1
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4. on page twenty - seven of edmond rostands cyrano de bergerac, cyrano…
Are you familiar with the work of Marie Curie? Born in Warsaw, Poland, on 7 November, 1867, Curie was a chemist and physicist. She and her husband, Pierre, won the Nobel Prize in …
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al + cuso₄ → al₂(so₄)₃ + cu
$2Al + 3CuSO_4 ightarrow 1Al_2(SO_4)_3+3Cu$
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al + cuso₄ → al₂(so₄)₃ + cu
$2Al + 3CuSO_4 ightarrow Al_2(SO_4)_3+3Cu$
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____ cu(no₃)₂ + ____ na₃po₄ → ____ cu₃(po₄)₂ + ____ nano₃
3, 2, 1, 6
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al + hcl → alcl₃ + h₂
2, 6, 2, 3
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hc₂h₃o₂ + ca(oh)₂ → ca(c₂h₃o₂)₂ + h₂o
2, 1, 1, 2
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\\_\\_\\_\\_ c₃h₈ + \\_\\_\\_\\_ o₂ \\_\\_\\_\\_ \\_\\_\\_\\_ fecl₃ + \…
For $\mathrm{C}_{3}\mathrm{H}_{8}+\mathrm{O}_{2} ightarrow$: 1, 5, $3\mathrm{CO}_{2}+4\mathrm{H}_{2}\mathrm{O}$ For $\mathrm{FeCl}_{3}+\mathrm{NaOH} ightarrow$: 1, 3, 1, 3
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c₃h₈ + o₂ → co₂ + h₂o
1, 5, 3, 4
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zn + hno₃ → zn(no₃)₂ + h₂
1, 2, 1, 1
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(_mathrm{zn}+ _mathrm{hno}_{3} ightarrow _mathrm{zn}(mathrm{no}_{3})_{2…
4
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caco₃ → cao + co₂
1, 1, 1
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reaction ____ k + ____ br₂ → ____ kbr
\(2K + 1Br_2 ightarrow2KBr\)
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4. on page twenty - seven of edmond rostands cyrano de bergerac, cyrano…
Are you familiar with the work of Marie Curie? Born in Warsaw, Poland, on 7 November, 1867, Curie was a chemist and physicist. She and her husband, Pierre, won the Nobel Prize in …
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porcelain originated in china around 2,000 years ago, but its productio…
The options are not fully visible, but based on the text content and the nature of the question, one would need to analyze how the under - lined sentence relates to the broader st…
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lucy needs to buy some organic apples, and her grocery store is having …
A. $\{x|x\geq0\}$
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physical science - control test 6 nwseptember 2025 question 3 3.1 compo…
3.1.1: The simplest whole - number ratio of atoms of elements in a compound. 3.1.2: $P = 2$ 3.1.3: $C_4H_{10}$ 3.2.1: The reactant that is completely consumed in a chemical reacti…
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juliet: o romeo, romeo! wherefore art thou romeo? deny thy father, and …
hopefulness and longing.
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physical science/control test 7 nw/september 2022 question 4 consider t…
4.1 Activation energy is the minimum energy required for reacting particles to react. 4.2 Exothermic. Reason: $\Delta H=-7.28\ kJ/mol$ (negative value means heat is released). 4.3…
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physical science/control test 7 nw/september 2020 question 4 consider t…
4.1: Activation energy is the minimum energy required for reactant molecules to react. 4.2: Exothermic. Reason: $\Delta H=-7.28\ kJ\ mol^{-1}<0$, heat is released. 4.3: $19.32\ kJ…
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physical science/control test 5 nw/september 2025 question 2 in an expe…
2.1: One mole of a substance is the amount of that substance containing as many elementary entities as there are atoms in 12 g of carbon - 12. 2.2: $Na_2CO_3(s)+2HCl(aq) ightarrow…
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romeo: to juliet. if i profane with my unworthiest hand this holy shrin…
Romeo's lines make up one quatrain, which uses an abab rhyme scheme.
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read the sentence from an argumentative essay about chemical waste. the…
B. The chemical waste produced by factories is dangerous, and factory owners should be held accountable.
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read the excerpt from the environmental ethic. it is fashionable in som…
A. All species are worth protecting because even the small organisms contribute important functions in the environment.
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lewis dot structure directions: fill in the lewis dot structure for eac…
| Problem | What is Wrong | Correct Version | | ---- | ---- | ---- | | :N: with 8 dots | Incorrect number of valence electrons (should be 5) | :N··· | | :Xe: with incorrect dot - …
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relating this information back to the flame test and light emission lab…
1. The heat from the flame. 2. We see an overall color. 3. Because each atom has a unique set of energy levels for its electrons.
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1. when water dissolves something, it creates... a. an ion; b. a nonpol…
A. an ion
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electron configuration practice name: for the elements draw the orbital…
Magnesium: $1s^{2}2s^{2}2p^{6}3s^{2}$ Calcium: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$ Phosphorus: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$ Copper: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s…
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classify the following as an element (a), compound (b), homogeneous mix…
45. B. Compound 46. A. Element 47. D. Heterogeneous mixture 48. B. Compound
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if one atom of fe+3 and three atoms of cl- ionically bond together what…
0
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31. what is the independent variable in the graph? a. solubility of sug…
C. Temperature
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if opposites attract and iron (fe +3) has a positive 3 charge (wants to…
Fe+3 attracts 3 Cl- atoms to become 1 atom of Fe ionically bonded to 3 atoms of Cl.
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so if opposite charges attract, how many sodium ions (na +) do you thin…
B. 2
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so we learned why group 1 atoms/elements have a positive +1 charge. why…
They must lose 2 electrons therefore making them +2
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how many valence electrons do group 2 metals have? *
2
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which element from group 17 will form an ion with the electron configur…
1. B. Chlorine (Cl) 2. C. Sulfur with 6 dots gaining 2 dots, enclosed in brackets with a 2 - charge.
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look at the two forms of copper. one copper ion can have a charge of +1…
copper (I), copper (II)
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57. consider two separate gas containers at the following conditions: c…
$P_B = 2P_A$
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was pinned to her shirt indicated she was a biochemist, here, i guessed…
H. it was
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review the details below. marie curie was the first person to receive t…
Scientist Marie Curie achieved several important milestones during her career.
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some types of head protection: hard hat or safety helmet offers protect…
After the expiry of its maximum service life. If the hard hat is deformed by a fallen object.
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19. calcium chloride has a density of 2.50 g/cm³. if you have 218 g of …
A. $87.2\ cm^{3}$
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head protection is mandatory. some types of head protection: hard hat o…
Climate, The material, Direct sunlight, Chemicals
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head protection protects the head against falling objects or impact. in…
Climate, The material, Direct sunlight
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some types of head protection: hard hat or safety helmet offers protect…
In places where you can bump your head. In places where you can get hit by falling objects. On seeing the appropriate mandatory sign.
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16. which of the following is not a sign that a chemical reaction may h…
B. Changing state from liquid to gas
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47. complete the following table for an ideal gas. p (atm) v (l) n (mol…
1. Recall the ideal - gas law: - The ideal - gas law is given by \(PV = nRT\), where \(P\) is the pressure in atmospheres (atm), \(V\) is the volume in liters (L), \(n\) is the nu…