化学
化学反应、化学计量、分子结构与元素性质。
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who was the scientist who proposed the plum pudding model? thomson dalt…
A. Thomson
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who was the scientist who proposed that the atom is a solid sphere of m…
A. Dalton
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how do you calculate the mass number of an atom? mass number = # neutro…
B. Mass number = # protons + # neutrons
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3. describe what type of electron transfer happens between these two at…
An ionic electron transfer occurs where magnesium donates 2 electrons to oxygen.
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2. which ion could bond with a calcium ion (ca²⁺) to form a neutral ion…
C. $S^{2 - }$
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1. when a neutral atom either loses or gains an electron, it becomes el…
A. ion
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what is the name of a row on the periodic table? a period a group a set…
A. A period
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you can make a solution more dilute or more concentrated by changing th…
1. more concentrated 2. more dilute 3. more concentrated 4. more dilute 5. more concentrated 6. more concentrated 7. more dilute
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drag and drop each term to the correct blank to complete the prompt. it…
Water is the solvent. The lemonade - mix is the solute. As the ice melted, the lemonade became more dilute. If you want the lemonade to be more concentrated, you could add another…
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your mom asked you to make a pitcher of sweet tea. what can you do to h…
1. Use the granulated sugar 2. Add sugar to tea while it is hot 3. Stir the tea vigorously
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2. baking powder and baking soda can lose their freshness and not work …
For baking powder, add 1 teaspoon to 1/2 cup warm water and check for vigorous fizzing. For baking soda, mix 1/4 teaspoon with a few drops of vinegar and look for strong fizzing.
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you poured a soda into your cup and remembered from your science class …
Solute: Flavorings, sugar, carbon dioxide, caffeine Solvent: water
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1. some powders should have given off gas bubbles upon reaction with vi…
D. $CO_2$
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classify each action as something that speeds up the rate at which solu…
Speeds up rate: stirring, heating, use smaller solute particles, crushing solute Slows down rate: cooling, use larger solute particles
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youre making fresh - squeezed lemonade with your grandmother. sort each…
Solute: sugar, yellow food coloring Solvent: lemon juice, water
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multiple - choice question what is/are the correct unit(s) for average …
atomic mass units
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element x has three stable isotopes. x - 12 has 80% abundance. x - 13 h…
15.01
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periodic table basics name braedeb prebell 1. which elements had comple…
1. Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn) 2. They are in Group 18. 3. Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Franc…
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4.1 characteristics of atoms nuclear charges contribute to the differen…
True
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4.1 characteristics of atoms which of the following is not correct for …
$1000g/m^{3}$
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1. identify which of the following is a complete and balanced chemical …
1. c. $Fe + S ightarrow FeS$ 2. a. $KOH + HCl ightarrow KCl + H_2O$ (already balanced), b. $2NaHCO_3 ightarrow H_2O + CO_2+Na_2CO_3$, c. $Pb(NO_3)_2 + 2KI ightarrow 2KNO_3+PbI_2$ …
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section 2 review key ideas 1. identify which of the following is a comp…
117 g
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3. a student burns 10g of paper in a closed system and collects the ash…
The law of conservation of mass is supported because the initial mass of the paper (10g) equals the total mass of the products (ash, gases, and by - products) after burning in a c…
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test content page 3 of 50 question 3 the strongest concentration you ca…
B. False
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section 1 review sc.912.p.10.1; sc.912.p.10.7 key ideas 1. list three s…
1. Change in color, production of gas, formation of precipitate. 2. a. Not a chemical reaction. b. Chemical reaction. c. Chemical reaction. 3. a. Hg and O. b. Ca, C, O, H, Cl. c. …
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instructions: in each of the following situations, write safe if the pr…
1. Answer: UNSAFE Reason: Lab glassware is not for drinking. 2. Answer: SAFE Reason: Wearing safety goggles when handling acid is proper. 3. Answer: UNSAFE Reason: Walking bare - …
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question 8 which of the following makes up a molecule of water? one ato…
two atoms of hydrogen and one atom of oxygen
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study these diagrams. the dots represent valence electrons orbiting the…
A. 4 dots around the nucleus represents the valence - electron pattern for a carbon atom.
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why is carbon present in so many types of molecules? it is abundant on …
It can form up to four covalent bonds.
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question 5 how are hydrogen bonds different from covalent bonds? 2.5 pt…
For the first question: Hydrogen bonds are weaker intermolecular forces between molecules with a slight positive charge on hydrogen and a slight negative charge on another atom, w…
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is the pronoun in bold reflexive or intensive? the west african savanna…
reflexive
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question 1: which statement is true of all organic compounds? all conta…
All contain carbon.
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short response 2. according to the text, what distinguishes ionic bonds…
2. Ionic bonds are formed by electron - transfer creating ions that attract, covalent bonds by electron - sharing. 3. A. The specific chemical composition of organisms dictates th…
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short response 2. according to the text, what distinguishes ionic bonds…
3. A. The specific chemical composition of organisms dictates the types of simple chemical reactions they can perform. 4. A. These bonds are likely fundamental to the structure an…
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apply: classify each of the following images as either an element, comp…
- Oil, water, sand: Heterogeneous mixture - Salt: Compound - Tin: Element - Pulp - free orange juice: Homogeneous mixture - Coffee: Homogeneous mixture - Sandwich: Heterogeneous m…
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study guide: classification of matter core vocabulary atom heterogeneou…
Matter; pure substance; element; atom; compound; molecule; homogeneous mixture; heterogeneous mixture
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is the pronoun in bold reflexive or intensive? for chemistry class, i n…
reflexive
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gallium is a metal which forms compounds with a wide variety of uses. s…
69
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seth is making a slideshow about precious metals for a school project. …
C. These metals resist heat and are less reactive than group 1 and 2 metals
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jailah needs a replacement for lithium for a science experiment. she tr…
C. Try an element in the same group as lithium
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wrap up: respond to the following prompt using complete sentences. a st…
# Explanation: ## Paso 1: Clasificar Sustancia 1 Un pH de 1,2 es menor que 7, lo que indica que es un ácido. Además, el hecho de que la papel de lítmus azul se convierta en rojo e…
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for each of the following activities, decide if it is an example of a p…
1. Change: Chemical change Justification: Combustion creates new substances. 2. Change: Physical change Justification: State change without new substances. 3. Change: Chemical cha…
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multiple choice question water dissolves a lot of ______ molecules and …
C. polar / ionic
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balance the following equations: 1. mg + o2 → mgo 2. cucl2 + h2s → cus …
1. $2Mg+O_2 = 2MgO$ 2. $CuCl_2 + H_2S=CuS + 2HCl$
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as a candle burns on the table, you can see the electromagnetic energy …
B. The total amount of all types of energy is conserved when the candle burns D. The total chemical energy equals the electromagnetic and thermal energy released when the candle b…
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balance the following equations: 1. 1 - mg + 2 - o2 → 3 - mgo 2. 3 - cu…
1. $2Mg + O_2 = 2MgO$ 2. $CuCl_2 + H_2S=CuS + 2HCl$
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during a camping trip, ming gathers firewood and arranges it in the fir…
C. chemical to thermal and electromagnetic
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emerging level - check each chemical equation below and indicate if it …
1. Yes 2. No 3. No 4. Yes 5. Yes 6. No 7. Yes 8. Yes 9. Yes 10. Yes 11. No 12. No
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main idea: a catalyst lowers activation energy. 1. what is activation e…
1. The minimum energy for reacting particles to react. 2. Increases reaction rate; Not consumed in reaction; Specific to certain reactions. 3. less
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multiple choice question the ______ atom in a water molecule is highly …
D. oxygen / electronegative
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similar properties figure 2 at room temperature, chlorine is a gas, bro…
They all have similar chemical properties and are non - metals.
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which of the following is an example of quantitative data? the color of…
the average number of offspring that an organism has
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classify each of the materials below. in the center column, state wheth…
| Material | Pure Substance / Mixture | Element or Compound / Solution(Homogeneous) or Mechanical mixture (Heterogeneous) | |--|--|--| | Laundry detergent (contains white and blue…
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physical properties of some elements element (symbol) melting point boi…
Atoms are the fundamental building - blocks of all matter in the universe. Their unique structures give elements distinct physical properties (such as melting point, boiling point…
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identifying a healthy product gabriella stops into a convenience store …
D. check the bottle's nutritional label to determine if all the ingredients are healthy
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question silver has two stable isotopes: $^{107}$ag with a fractional a…
106.9 amu
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complete the sentence: as the temperature increases, the solubility ___…
increases
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question bromine has two stable isotopes: ⁷⁹br and ⁸¹br with masses of …
5.06 g
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molar mass of a covalent compound 1 h 1.01 16 s 32.07 what is the molar…
34.09 g/mol
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use the periodic table to answer the question. write the atomic symbol …
$_{60}^{150}\text{Nd}$
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what is the molar mass of the covalent compound ncl3? ncl3 = ? $\frac{g…
$120.36$
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use the periodic table to answer the question. write the atomic symbol …
$_{60}^{150}\text{Nd}$
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mj: support structures use the information below to answer the question…
an ultrasonic bath
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use the periodic table to answer the following question. write the atom…
$_{15}^{32}\text{P}$
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molar mass of covalent compounds 1 h 1.01 7 n 14.01 what is the molar m…
32.06 g/mol
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12. search the web to complete this chart (1st row is done as example) …
| | Organic Farms | Factory Farms | |--|--|--| | Animal Welfare | Focus on natural living conditions and humane treatment | May have crowded and inhumane conditions | | Artificial…
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what is the molar mass of the covalent compound n2o? n2o = ? $\frac{g}{…
44.02 g/mol
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what is the molar mass of the covalent compound bf3? bf3 = ? $\frac{g}{…
67.81 g/mol
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write the atomic symbol (including the atomic number) for the isotope o…
$^{129}_{53}I$
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question a sample of silicon has an average atomic mass of 28.084 amu. …
3.1%
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why does surface tension of liquids generally decreases with increase o…
d. Both A and B
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because of waters ______ intermolecular forces, its rate of evaporation…
C. strong; low
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the element lithium is composed of 2 isotopes; about 92.41% of all lith…
6.94 amu
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how do the melting and boiling points of water compare to that of other…
c. They are both much higher.
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a. what is the difference between mechanical weathering and chemical we…
a. Mechanical weathering is physical break - up, chemical weathering is chemical change. b. Splash erosion, sheet erosion, gully erosion. c. Organic matter, soil pH, nutrient avai…
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question which of the following terms represents the total number of pr…
the mass number
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1-12 physical properties of water 2/10 the pressure is the pressure pro…
vapor
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to find the number of neutrons in an atom, simply calculate: select the…
mass number - atomic number
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experimental procedure: emulsification of lipids label three clean test…
No
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atoms of the same element can have different: select the correct answer…
B. mass numbers
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physical properties of water 1/10 the attraction of molecules at the su…
Surface tension
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waters unusual properties are primarily due to ______. a molecular geom…
d. hydrogen bonding
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question which particle contributes neither to the atomic number nor th…
C. electron
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for parts of the free response question that require calculations, clea…
The element is silicon (Si) and its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}\)
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how does weathering vary according to climate? what are five factors af…
1. Weathering varies with climate based on temperature, precipitation and humidity which influence rate and type of weathering. 2. Parent material, climate, living organisms, topo…
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what is the primary intermolecular force that attracts water molecules …
C. hydrogen bonding
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which describes the polarity of a water molecule? a polar, with the oxy…
C. polar, with the oxygen atom partially negative and the hydrogen atoms partially positive
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if na reacts with chlorine to form nacl, which of the following element…
1. A. K, because it is in the same group as Na. 2. C. The two valence electrons of alkaline earth metal atoms are relatively easy to remove.
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a water molecule has: a one polar covalent bond and one nonpolar covale…
C. two polar covalent bonds
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how many bonds can each oxygen atom of a water molecule take part in? a…
C. two covalent bonds and two hydrogen bonds
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hydrogen atom in a given water molecule is strongly attracted to: a the…
B. the lone pair of electrons on an oxygen atom of a nearby molecule
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the shape of a water molecule is _____. a linear b bent c trigonal plan…
B. bent
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which of the following best helps to explain why the electron affinity …
1. D. There is a greater attraction between an added electron and the nucleus in Br than in I. 2. C. When Cl and F form bonds with other atoms, the Cl bonding electrons are more s…
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which correctly describes the h - o - h bond angle in a water molecule?…
c. slightly less than 109.5°
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which of the following is the best description of the bond between oxyg…
polar covalent
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how do water molecules interact with one another? a nitrogen bonds b hy…
B. Hydrogen bonds
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the prefix in subatomic tells us that subatomic particles are: select t…
the basic building blocks of atoms
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summarize it! drag and drop the words or phrases that accurately comple…
folding, rust, decay
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the complete photoelectron spectrum of an element is given above. which…
First question: B. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ Second question: D. The electrons in the $2p$ sublevel have the smallest binding energy.
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practice it! select the statement(s) that accurately describe physical …
Physical changes change the physical properties of materials. Chemical changes are not reversible. Chemical changes result in a change in the chemical makeup and can create new su…