化學
化學反應、化學計量、分子結構與元素性質。
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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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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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mineralogical differences are detectable in samples collected from two …
C. uniform
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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
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paper can be made from many plants, but usually trees are used. first, …
A. process
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the graduated cylinder below shows major scale divisions every 5 ml. ho…
36 mL
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quiz: period table & trends possible points: 10 match the definitions w…
1. group 18, has 8 valence electrons -> noble gases 2. Outer - shell (energy level) electron -> valence electron 3. Amount of energy needed to remove an electron -> ionization ene…
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quiz: period table & trends possible points: 10 elements in group 17 ha…
A. 7, gain
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quiz: period table & trends which element is the most electronegative? …
D. F
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quiz: period table & trends the figure below shows chlorine iodine and …
C
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the periods and groups on the periodic table are numbered. for example,…
E. Bromine (Br) in period 4, group 17
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guiding questions how did the boys and their coach react to the life - …
A. They kept themselves alive and mentally stable.
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choose the type of bond that best matches each of the following descrip…
a. nonpolar covalent bond b. polar covalent bond c. hydrogen bond
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arrange the elements in the third period in order of decreasing atomic …
Sodium > Phosphorus > Sulfur
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why does the atomic radius change down a group/family? number of proton…
Number of layers (Shielding effect) increases down a group, therefore making radius bigger
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the most distinctive property of the noble gases is that they are _____…
C. largely unreactive
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question 7 0.5 pts which of the following questions is/are true? there …
Each water molecule has regions of charge. When water molecules “stick” to other water molecules, this is called cohesion. A hydrogen bond is weak compared to a covalent bond.
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which of the following molecules can form? there is only one correct an…
Molecule D
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read this excerpt from a passage. in 2008, the once - thriving company …
Profits fell, but that was not the story the leaders of the company were telling.
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why does the procedure use a graduated cylinder and not simply have you…
Accuracy is important in the laboratory. There is no way to accurately put 2 mL into a test tube without first measuring 2 mL in the graduated cylinder.
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calcium (ca) is predicted to have a reactivity than potassium (k) and a…
Less; More; More; Less
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multiple - choice question choose the item with the highest electronega…
S (sulfur)
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which patterns are observed on the periodic table of the elements? sele…
B. As you look from left to right within a period, ionization energy increases. C. As you look from left to right within a period, electronegativity increases. D. As you look from…
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multiple - choice question choose the atom with the highest ionization …
C. Cl
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multiple - choice question choose the larger item potassium atom (k) po…
Potassium Atom (K)
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multiple - choice question choose the larger item. bromine atom (br) br…
Bromine Anion (Br - 1)
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which of these is the correct lewis dot structure for the nitrogen atom?
The structure with 5 dots around the 'N' (the third option among the ones shown as it has two dots on one side and one dot on each of the other three sides) is the correct Lewis -…
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what determines the chemical properties of an element? o atomic number …
C. number of valence electrons
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multiple - choice question which element has the highest electronegativ…
C. Fluorine
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which element is represented by the following electron configuration: 1…
silicon
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which of these has 28 protons and 26 electrons? o fe o fe²⁺ o ni o ni²⁺
D. $Ni^{2+}$
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2. identify each of the common items below as an element, a compound or…
A. Compound B. Element C. Compound D. Mixture E. Element F. Mixture G. Element H. Mixture I. Mixture J. Element K. Compound L. Mixture
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an atom with an atomic number of 50 and a mass number of 120 contains 5…
50 protons, 50 electrons, 70 neutrons
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multiple - choice question what is electronegativity? the atoms ability…
the atom's ability to hold electrons tightly
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multiple - choice question why do we disregard the noble gasses for ele…
they follow the octet rule with 8 valence electrons
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1. identify each of the drawings below as an element, a compound or a m…
For the drawings: Analyze particle - types as described above. For the common items: A. Compound B. Element C. Compound D. Mixture E. Element F. Mixture G. Element H. Mixture I. M…
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what is the trend in ionization energy as you move across period 2, fro…
C. Increases
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3. which of the following is not a true statement? a. two or more atoms…
B. Pure substances are made of only one type of atom.
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3. which of the following is not a true statement? a. two or more atoms…
B. Pure substances are made of only one type of atom.
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multiple - choice question what is ionization energy? the atoms tendenc…
energy required to remove an electron from an atom
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multiple - choice question how is the ion magnesium mg+2 made? the atom…
the atom loses two electrons
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as you move left to right across the periodic table valence electrons f…
the nucleus has more protons
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amount of hydrogen vs. ph amount of hydrogen, x (in moles per liter) ph…
The function $f(x)=-\log_{10}(x)$ models the data in the table.
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multiple - choice question what is the atomic radius? the size of the a…
the size of the atom
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section review 1. use the periodic table on the inside back cover to wr…
1. Oxygen, Sulfur, Copper, Silver 2. Fe, N, Ca, Hg 3. Elements in a group 4. Metals are good conductors, shiny, malleable and ductile. Non - metals are poor conductors, dull, brit…
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13) match the descriptions with the elements. the most abundant element…
1. Oxygen 2. Helium 3. Silicon 4. Aluminum 5. Iron 6. Calcium
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which element does the chart describe? ?????? . it is the lightest elem…
B. hydrogen
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how many elements exist naturally on the earth? 118 98 7 fundamental
B. 98
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multiple - choice question how many valence electrons are in group 2? 1…
C. 2 valence electrons
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a(n) ____ is a specific type of atom or molecule with unique properties…
C. element
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multiple - choice question why do elements in a group behave similarly?…
They have the same number of valence electrons
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patterns of properties quick check what are valence electrons? (1 point…
the electrons in an atom's outermost energy level
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multiple - choice question what do the blank boxes represent? elements …
C. elements Mendeleev said would be discovered later.
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patterns of properties quick check why do atoms exchange or share elect…
to obtain a full outer electron shell
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question 1 - 6 what property of water allows it to be a versatile solve…
polarity
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patterns of properties quick check which feature defines a neutral atom…
the number of electrons equal to the number of protons
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multiple - choice question how did mendeleev arrange chemicals with sim…
In columns called groups
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9) drag and drop the answers to the atom diagram.
- The central part (the red - orange part in the diagram) is the nucleus. - Inside the nucleus, the positively charged particles are protons and the neutral particles are neutrons…
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multiple - choice question who is best known for designing the periodic…
C. Dmitri Mendeleev
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____ are the smallest parts of matter that still contain all the proper…
A. Atoms
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which two facts are about electrons? the negatively charged particles a…
The negatively charged particles are smaller than protons and neutrons. They move extremely fast in the electron cloud around the atom’s nucleus.
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observa la reacción usando el siguiente video:https://www.youtube.com/w…
# Explicación: ## Paso 1: Comprender la reacción química La reacción entre cloruro de hidrógeno y amoníaco forma cloruro de amonio (un sólido que se ve como un anillo blanco). La …
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section review 1. a. what is the main difference between physical prope…
1. a. Physical properties don't change substance identity; chemical properties do. 1. b. Physical: color; Chemical: flammability. 2. a. Physical change. 2. b. Physical change. 2. …
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6 multiple choice 1 point li + select the correct electron configuratio…
D. $1s^{2}$
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4 multiple choice 1 point li select the correct electron configuration …
B. 1s² 2s¹
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3 fill in the blank 1 point a neutral atom has choose your answer... am…
1. equal 2. more 3. fewer (less)
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2 multiple answer 1 point which electron configurations below are stabl…
A. $1s^{2}$ C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ D. $1s^{2}2s^{2}$