Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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how many valence electrons are in an atom of the element fluorine? (1 p…
C. seven
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why do atoms exchange or share electrons during bonding? (1 point) to b…
to obtain a full outer electron shell
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what are valence electrons? (1 point) electrons that are exchanged betw…
the electrons in an atom's outermost energy level
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development of acids and bases, glassware, and better techniques for me…
A. TRUE
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which feature defines a neutral atom? (1 point) ○ a full outer electron…
the number of electrons equal to the number of protons
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the alchemists eventually succeeded in turning base metals into gold. t…
FALSE
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hydrogen bonding is responsible for unique properties of water. which c…
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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question 1-2 hydrogen bonding is responsible for unique properties of w…
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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which of the following is not a contribution that alchemists made to th…
d. discovered subatomic particles
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what were the three major streams of alchemy that are known? a chinese,…
A. Chinese, Indian, and European
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modern scientists can change lead into gold by nuclear bombardment. wha…
b. It is too expensive.
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b/ identify the equipment show a) test tube b) ring clamp c)mortar d) t…
1st drawing: l) beaker 2nd drawing: m) rubber stopper (cork) 3rd drawing: d) test tube tongs 4th drawing: c) mortar 5th drawing: e) graduated cylinder 6th drawing: k) erlenmeyer f…
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one goal of the alchemists was to find a way to turn base metals into g…
A. silver
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in what way(s) did alchemists contribute to modern chemistry? select al…
A. organizing and classifying substances to predict the products of reactions D. producing gunpowder, glass, and ceramics
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module 1 exam chemistry part 1 ae teacher (acc ed) / module 1: chemistr…
Quantitative data is numerical and measurable, while qualitative data is descriptive and non - numerical.
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19. what is the difference between organic chemistry and inorganic chem…
Organic chemistry is the study of carbon - containing compounds, while inorganic chemistry focuses on non - carbon compounds.
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to rent a certain meeting room, a college charges a reservation fee of …
$t\leqslant7$
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name: j - lovem(?) date: 2. sam was mixing a solution of salt and water…
1. Rinse eyes with water for 15 - 20 minutes, then seek medical help. 2. Rinse hand with water, apply neutralizing agent if available, seek medical advice if needed.
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9. if an element has 7 electrons, what is the element name? 10. an endo…
9. Nitrogen 10. Absorbs 11. Releases 12. Direct 13. A gas expanding in a cylinder and doing work while absorbing heat 14. a. +
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9. explain the difference between accuracy and precision.
Accuracy is closeness to true value; precision is closeness of repeated measurements to each other.
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3. how do you know if an element is an isotope?
If atoms of an element have the same atomic number but different mass - numbers (owing to different numbers of neutrons), they are isotopes.
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question 1 - imagine you have a bottle of vinegar and water used to cle…
Yes, changing the amount of water affects how acidic it is. Adding more water makes the solution less acidic because it dilutes the concentration of the acid (acetic - acid in vin…
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which of the following is an organic molecule? a. nacl b. feo c. ch₄ d.…
C. CH₄
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mg 24.305 atomic # = atomic mass = # of protons = # of neutrons = # of …
| Element | Atomic Number | Atomic Mass | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | Mg | 12 | 24.305 | 12 | 12 | 12 | | Ar | 18…
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which of the diagrams best shows the arrangement of molecules in a liqu…
C. (suponiendo que la opción C muestra moléculas desordenadas y relativamente cerca una de otra dentro del recipiente)
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question 20 of 25 what is in the cloud of negatively charged particles …
D. Electrons
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question 19 of 25 look at the word equation below. glucose + fructose →…
A. Dehydration of simple sugars
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16 s 32.06 atomic # = __ atomic mass = __ # of protons = __ # of neutro…
| Element | Atomic Number | Atomic Mass | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | S | 16 | 32.06 | 16 | 16 | 16 | | I | 53 | …
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question 18 of 25 what happens when a sodium atom loses an electron in …
B. It becomes a positive ion.
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what type of energy is food? a. thermal b. sound c. chemical d. mechani…
# Breve explicación: La comida contiene compuestos químicos como carbohidratos, proteínas y grasas. Estas moléculas químicas almacenan energía en sus enlaces químicos. Cuando el c…
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question 16 of 25 which molecule most likely has the greatest amount of…
B. O=C=O
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question 14 of 20 which best describes the nucleus of an atom? a. it is…
D. It is the part of the atom with the greatest mass.
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o 15.999 atomic # = ____ atomic mass = ____ # of protons = ____ # of ne…
**Oxygen**: Atomic number = 8 Atomic mass = 15.999 Number of protons = 8 Number of neutrons = 8 Number of electrons = 8 **Zinc**: Atomic number = 30 Atomic mass = 65.38 Number of …
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what type of energy creates lightning? a. electrical b. mechanical c. s…
# Breve explicación: La relámpago es un fenómeno eléctrico causado por la descarga de electricidad entre nubes o entre una nube y la tierra. La energía eléctrica es la responsable…
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which atoms form an ionic bond? a. magnesium and lithium b. magnesium a…
B. Magnesium and bromine
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88 multiple choice listen what does earth science primarily study? a di…
A. different processes and systems of Earth
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mass is considered a ______ property extensive intensive
Extensive
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what does the --> sign mean in this equation: h2o --> h2 + o2 enzyme ac…
yield
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bohr model drawing (25 points) draw a bohr - model of an oxygen atom in…
In the Bohr - model drawing of an oxygen atom: - Nucleus contains 8 protons and 8 neutrons. - First electron - orbit (closest to the nucleus) has 2 electrons. - Second electron - …
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gloves are made from a synthetic rubber and provide protection from a v…
B. Neoprene
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13) a ph is a logarithmic scale that is used to describe the relative c…
False ### 14
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h2 is an molecule mixture element compound
Molecule
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8) acid has the same ph as... (a) acidic (b) neutral (c) ph (d) basic 9…
1. A. acidic 2. D. 14 3. D. neutralization 4. D. baking soda with a pH value of 8 - 9
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a feature of organic compounds not found in inorganic compounds is the …
C. carbon atoms covalently bonded to each other
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example 3.6: constant - pressure calorimetry ammonium nitrate (nh₄no₃, …
$q = 6.12\times10^{3}\ J$ (the magnitude of the heat absorbed by the dissolving process), and the process is endothermic.
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3) acids have a ph value ____ than 7. 4) bases have a ph value ____ tha…
3. lower 4. higher 5. The concentration of hydrogen ions ($H^+$) in a solution. 6. True 7. B. 7
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15 mark for review in a chemical reaction a chemical bonds can be forme…
D. All answers are correct
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oil and water are a ______ mixture. homogenous heterogenous
B. Heterogenous
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1) according to the image above, which substance has the strongest acid…
1) The substance with the lowest pH value shown in the image is the strongest acid. 2) The substance with the highest pH value shown in the image is the strongest base.
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24) place these unknown ph test papers in order from most acidic to mos…
24) Need to see the actual colors on the pH - test papers compared to the chart to determine the order. 25) B. 4
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21) name the acid or base for label d. 22) identify all the substances …
21) Cannot be determined 22) A. tomatoes (pH = 4), B. cola drinks (pH = 3), D. vinegar (pH = 5.6) 23) B. detergent (pH = 10), C. baking soda (pH = 8), D. oven cleaner (pH = 14)
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18) name the acid or base for label a. 19) name the acid or base for la…
A) tomatoes (pH = 4) B) cola drinks (pH = 3) D) vinegar (pH = 5.6)
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13) a substance that conducts electricity when dissolved in water are c…
13. C. electrolytes 14. True 15. B. water, D. salt 16. D. a substance that when dissolved in water produces OH - ions, it is an OH - donor 17. B. a substance that when dissolved i…
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11) in terms of ph, explain what would happen if you mixed vinegar with…
11. D. the pH level of the solution would be between 3 and 11 12. B. The lemon has a lower pH than the apple.
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7) the ph of a strong base would be closest to oa) 0 ob) 7 oc) 14 8) th…
7. C. 14 8. A. 0 9. A. acid 10. D. acid and base
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bohr model drawing (25 points) draw a bohr model of an oxygen atom in t…
Protons: 8 Neutrons: 8 Electrons: 8 (For the drawing: Draw a nucleus in the center. Label it with 8 protons and 8 neutrons. Draw two electron - orbits around the nucleus. Place 2 …
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3) identify all the properties of an acid. a) bitter taste b) corrosive…
3. B. corrosive, C. pH level less than 7, D. sour taste 4. B. bitter taste, E. pH value greater than 7 5. B. use pH paper or litmus paper 6. B. lemon juice is an acid
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part b. 1.draw the bohr - rutherford model of atomic structure for elem…
(1) For Beryllium (Be, atomic number = 4) in Bohr - Rutherford model: Draw a nucleus with 4 protons and 5 neutrons (approximate number of neutrons for most common isotope). Then d…
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label the parts of an atom on the diagram below. 4. what type of charge…
4. Positive charge 5. Neutral charge 6. Negative charge 7. Protons and neutrons 8. 35 9. 6 (assuming 6 protons in the diagram) 10. 12 (assuming 6 protons and 6 neutrons in the dia…
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41) what is the difference between dilution and concentration? 42) iden…
41) Dilution reduces solute - to - solvent ratio by adding solvent; concentration is amount of solute in solution. 42) B. dilute solution 43) A. concentrated solution 44) A. conce…
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36) what is solubility? oa) the ability of a given substance(solute) to…
36) A. The ability of a given substance(solute) to dissolve into a solvent. 37) False 38) C. Polar solvent molecules separate the molecules of other polar substances. 39) B. What …
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32) reactions that can not occur spontaneously are.. oa) exothermic ob)…
32) B. endothermic 33) B. endothermic 34) A. exothermic 35) B. endothermic
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how did chemistry start? by accident as experimentation an apple fallin…
Alchemy and philosophy
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28) this measures the amount of a product obtained from a reaction. 29)…
28) Yield 29) A. actual yield 30) D. how efficient the reaction is 31) B. theoretical yield
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26) what is the first step in a stoichiometry problem? 27) how many mol…
Balance the chemical equation ### 27)
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22) the calculation of quantities in a chemical reaction is called stoi…
22. True 23. True 24. True 25. A. 1:1
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20) balance the following chemical equation. what number should be on t…
1
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5 mark to review salt dissolves in water making it a hydrophobic b hydr…
B. Hydrophilic
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solubility curves practice: use the solubility curve to answer the ques…
1. Unsaturated 2. Unsaturated 3. Saturated 4. Unsaturated 5. 70 g 6. 40 g 7. 37 g 8. 65 g 9. 55 g 10. 100 g
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question 2 of 8 3 points fill in the blanks: word bank: makeup, bouffan…
First blank: walrus Second blank: makeup Third blank: paraphenylenediamine
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solubility curves practice: use the solubility curve to answer the ques…
1. Unsaturated 2. Unsaturated 3. Supersaturated 4. Unsaturated 5. [Read value from curve] 6. [Read value from curve] 7. [Read value from curve] 8. [Read value from curve] 9. [115 …
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a sodium atom that has lost an electron comes near a chlorine atom that…
D. They form an ionic compound.
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which of the following is an example of a chemical change? a. dissolvin…
C. Baking a cake
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calculating average atomic mass. natural copper (cu) consists of 2 isot…
63.55 g/mol
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organic chemistry studies what? non - carbon elements polymers living t…
Carbon compounds
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question 3 of 5 1 point the steam distillation process was refined by a…
False
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which statement is true regarding the macroscopic and microscopic natur…
C. Chemists make observations on the macroscopic scale that lead to conclusions about microscopic features
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which of the following are considered to be part of the study of chemis…
A. changes to matter C. composition of matter D. properties of matter
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which of the following example(s) from everyday life are made possible …
A. You wear a synthetic spandex athletic shirt while exercising. C. After you eat an apple, you get a boost of energy. D. When you have a cold, you take a pill to get relief.
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which field of study would the following statement be related to? vineg…
d. chemistry
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8 multiple choice 1 point what does the ph scale measure? the amount of…
The acidity or basicity of a substance
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7 multiple choice 1 point a solution is best described as: a solid made…
B. A mixture where substances are evenly distributed
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6 multiple choice 1 point which of the following is a compound? oxygen …
C. Carbon dioxide ($CO_2$)
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5 multiple choice 1 point what is a molecule? a single atom with no bon…
C. Two or more atoms bonded together
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multiple choice 1 point what part of an atom contains protons and neutr…
B. Nucleus
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3 multiple choice 1 point which term refers to a substance made of only…
C. Element
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2 multiple choice 1 point what is the smallest unit of an element that …
D. Atom
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properties of matter properties are the characteristics of a substance.…
1. Physical property - Characteristics of a substance that can be measured or observed without changing the sample (e.g., mass, color, hardness, boiling - point). 2. Chemical prop…
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solid (i) (a) ? (b) ? liquid (ii) (c) ? (d) ? gas (iii)
(a) Melting (b) Freezing (c) Vaporization (d) Condensation
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2. complete the chart below with every physical and chemical property l…
2. | Physical Properties | Chemical Properties | | --- | --- | | Mass, volume, density, shininess, melting point, boiling point, malleability, non - magnetism, high electrical con…
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subtract the measurements. 0.83 g - 0.0562 g write your answer with the…
0.77 g
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a. magnesium has a +1 charge and fluorine has a -2 charge b. magnesium …
- Q13: B. Covalent, because it is made of nonmetals sharing electrons - Q14: B. Test if it dissolves in water and conducts electricity - Q15: C. It helps in designing medicines an…
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a. ionic compounds have low melting points; covalent compounds have hig…
- Q6: B. Ionic compounds conduct electricity when dissolved; covalent compounds usually do not - Q7: B. It gains one electron to complete its octet - Q8: A. AlN - Q9: B. N₂O₄ - Q1…
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put these elements in order of smallest to largest atomic volume arseni…
Helium, Fluorine, Sulfur, Arsenic, Tin, Platinum, Thallium, Cesium
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mineralogical differences are detectable in samples collected from two …
C. uniform
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name: kinore bright dok 1 - recall & comprehension q1. what is a compou…
Q1. B. A substance made of two or more elements chemically combined Q2. C. Atoms tend to gain, lose, or share electrons to have 8 in their outer shell Q3. B. Positive Q4. B. Carbo…
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put these elements in order of largest to smallest atoms rubidium stron…
Rubidium, Strontium, Yttrium, Indium, Palladium, Silver, Xenon
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oxygen isotopes have atomic masses that range from: 15 to 20 12 to 18 9…
12 to 18
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solve the following isotope related question a) the former president an…
Harrisium wins the contest.
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put these elements in order of smallest to largest atomic radius xenon …
Helium, Neon, Argon, Krypton, Xenon, Radon