Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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how can the chemical formula for methane (ch4) be explained if carbon h…
The carbon atom promotes one electron from the s orbital into the p orbital, which creates four half - filled orbitals available to accept one electron from four different hydroge…
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2: complete the chart below. | hyphen notation | nuclear notation | ato…
| Hyphen Notation | Nuclear Notation | Atomic # | Mass # | # of $p^{+}$ | # of $n^{0}$ | # of $e^{-}$ | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | Uranium - 235 | $^{235…
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place these atomic models in order from oldest to most recent. a b c d …
C, A, D, B
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note: to answer some of the questions, it may help to reference a perio…
The metals at the bottom of the periodic table are more reactive than metals at the top of the periodic table. The metals farthest to the left of the periodic table are the most r…
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note: to answer some of the questions, it may help to reference a perio…
A. The metals at the bottom of the periodic table are more reactive than metals at the top of the periodic table. B. The metals farthest to the left of the periodic table are the …
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what is a main difference between the modern atomic model and bohrs pla…
Electrons do not orbit the nucleus on fixed paths.
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which statement correctly defines an elements reactivity? a property de…
a property describing how readily atoms engage in a chemical reaction when they interact
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how many valence electrons does sulfur have? sixteen valence electrons …
six valence electrons
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what is the electron configuration for tin (sn), with an atomic number …
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p²
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6. looking at your answers to questions 1 and 2 from model 1, tell what…
a. Hydrogen atoms b. Oxygen atoms 7. Covalent bonds 8. Hydrogen bonds 9. a. Partial negative charge b. Partial positive charge 10. Arranged with hydrogen of one molecule attracted…
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if an element has the atomic number 20, what sublevels are present? it …
The first energy level has an s; the second and third energy levels have an s and a p; the fourth energy level has an s.
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note: to answer some of the questions, it may help to reference a perio…
C
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properties of water pogil what makes water so special? why? when you he…
1. 2 2. 1 3. Covalent bond 4. The electron density around the oxygen atom is higher than that around the hydrogen atoms. 5. On the oxygen atom.
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its time for the unit exam. this is your opportunity to show how much y…
Light behaves as a wave, which is shown when it is passes through slits and produces a diffraction pattern. Light behaves as a particle, which is shown when it is shines on a meta…
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question 4 (mandatory) (10 points) the public health department nurses …
C. Two or more people having experienced a similar illness after exposure to water
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its time for the unit exam. this is your opportunity to show how much y…
The higher the frequency of the electromagnetic wave, the shorter the wavelength.
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its time for the unit exam. this is your opportunity to show how much y…
A
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note: to answer some of the questions, it may help to reference a perio…
1
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when a potassium (k) ion is formed, what is its charge and why? a potas…
C. A potassium ion will form a 1+ charge because it will lose one electron to achieve a full valence level.
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which statement correctly identifies the nuclide that is most likely to…
Uranium-238 ($^{238}$U) is likely an unstable nuclide because it has a neutron - to - proton ratio that is 1.6:1 and for light elements the ideal neutron - to - proton ratio is 1:…
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note: to answer some of the questions, it may help to reference a perio…
87.62 amu
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consider the scenario. an unknown element has been discovered. the atom…
The atomic number is 212, and the atomic mass is 529. So the correct option is: The atomic number is 212, and the atomic mass is 529.
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note: to answer some of the questions, it may help to reference a perio…
Lead (Pb)
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use the periodic table and your knowledge of atomic structure to match …
Sodium (Na) - $1s^{2}2s^{2}2p^{6}3s^{1}$ Phosphorus (P) - $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$ Chlorine (Cl) - $1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}$ Arsenic (As) - $1s^{2}2s^{2}2p^{6}3s^{2…
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why is atomic mass measured in atomic mass units (amu)? electrons and n…
Protons and neutrons make up nearly all the mass of an atom, and each is worth 1 amu. Each atom of an element has a mass measured in amu; thus, its weighted average, or atomic mas…
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note: to answer some of the questions, it may help to reference a perio…
The percent abundance for each isotope of an element (in decimal form) is multiplied by its mass. Then, the calculated values of all isotopes for that element are summed. Atomic m…
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note: to answer some of the questions, it may help to reference a perio…
The first choice (where the arrows between the proton and electron point towards each other) is correct.
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note: to answer some of the questions, it may help to reference a perio…
The electrostatic force between protons and electrons is an attractive force.
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what new characteristic did john dalton add to the model of the atom? a…
A. An atom is a round, solid mass. D. An atom can join with other kinds of atoms.
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note: to answer some of the questions, it may help to reference a perio…
The plum - pudding model did not identify a central nucleus as the source of a positive charge.
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use the periodic table and your knowledge of atomic structure to match …
Chromium (Cr): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}$ Arsenic (As): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{3}$ Chlorine (Cl): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}$ Phosp…
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which statement belongs to daltons atomic theory? atoms have a massive,…
Atoms cannot be created or destroyed.
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which electron configuration is not a configuration of a stable main - …
B. $1s^{2}2s^{2}$
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note: gloves are never worn when working on machines with rotating part…
All statements are correct.
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question 10 (1 point) (02.03 mc) the following orbital notation is for …
b. N ### Question 11
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question 9 (1 point) (02.03 mc) the diagram shows four different locati…
B. 2 and 3
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which scientist developed the first model of the atom that proposed the…
D. Thomson
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question 7 (1 point) (02 03 mc) magnesium (mg) has an atomic number of …
Question 7: C. $1s^{2}2s^{2}2p^{6}3s^{2}$ Question 8: C. 1 and 4
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when analyzing electron configurations, the stability of a particular m…
For the first question: D. s and p For the second question (assuming the options continue from the first part and we are looking for an unstable main - group configuration): Infor…
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question 4 (1 point) (02.03 lc) what type of orbital is spherical in sh…
Question 4: A. s orbital Question 5: B. p orbital Question 6: C. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}\)
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question 1 (1 point) (02.03 lc) what is the total number of electrons t…
Question 1: b. 6 electrons Question 2: c. 10 electrons Question 3: d. 14 electrons
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cold or hot objects. sharp edges. note:gloves are never worn when worki…
B. Chemicals C. Cold and hot objects D. Electricity E. Sharp edges
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use the list to answer the question. • potassium, group ia • calcium, g…
potassium and iodine
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fluorine has 7 valence electrons. which charge is its ion likely to hav…
1-
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question 19 (1 point) (02.02 mc) the image shows the representation of …
B. The number of neutrons in an atom of the element is 10.
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which information about an atom can a period number give you? (1 point)…
how many energy levels it has
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ions quick check when moving across a period from left to right in the …
Valence electrons increase by one
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question 18 (1 point) (02.02 mc) the image shows the representation of …
c
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many accidents can be prevented by wearing protective clothing. it prot…
Flame retardant clothing is suitable for welding. High visibility clothing can be used when working at the road side. Impervious clothing is suitable when working with chemicals, …
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ions quick check based on the naming rules for ions, which of the follo…
B. chloride
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question 17 (1 point) (02.02 mc) the image shows the representation of …
d. The mass number of the most common isotope of the element is 24.
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question 14 (1 point) (02.02 mc) zinc has the chemical symbol zn and th…
Question 14: d. 30 protons, 39 neutrons, 30 electrons Question 15: b. 6 Question 16: d. 11
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show all calculation setups. adjust for significant figures and give un…
$63.65$ amu (adjusted to four significant figures)
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part b which statement is true regarding main - group families of the p…
C. Lithium is an alkali metal that loses 1 electron to become a cation to become stable.
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question 11 (1 point) (02.02 lc) which of the following best describes …
Question 11: B. Brittle, dull, and low density Question 12: B. Metal Question 13: B. 28 protons, 50 neutrons, 28 electrons
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practice: isotope calculations #2 1. complete the following table. nucl…
| Nuclear Notation | Atom or Ion? | Atomic # | Mass # | # of Protons | # of Neutrons | # of Electrons | |---|---|---|---|---|---|---| | $^{24}_{11}Na$ | Atom | 11 | 24 | 11 | 13 |…
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how many protons, neutrons, and electrons are in krypton? p = 36, n = 8…
P = 36, N = 48, E = 36 (the second option)
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question 8 (1 point) (02.02 lc) use the periodic table to match each of…
1. c 2. a 3. b ### Question 9
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how many protons, neutrons, and electrons are in lead (pb)? p = 207, n …
P = 82, N = 125, E = 82
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question 5 (1 point) (02.02 mc) helium (he), oxygen (o), carbon (c) flu…
- Question 5: d. Fluorine and chlorine, because they are both halogens - Question 6: d. Neon and argon, because they are both noble gases - Question 7: 1. b 2. c 3. a
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how many protons, neutrons and electrons are in boron? p = 10, n = 5, e…
P = 5, N = 5, E = 5
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(02.02 lc) mendeleev used his arrangement of elements in order of incre…
1. a. True 2. a. True 3. b. False 4. b. Magnesium (Mg), because they are both alkaline earth metals
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it protects against: dangerous substances cold and hot objects moving m…
Hazardous substances. Fire Moving machine parts. Cold and hot objects.
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7. the effective nuclear charge, ( z_{eff}), experienced by valence ele…
7. A. Increases 8. No correct core - electron option given; A. group 3A 9. C. Na and F 10. B. The element belongs in row 3 of the periodic table and is classified as a noble gas (…
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daltons theory states that atoms are the smallest possible parts of ele…
Atoms rearrange and form new substances with new properties.
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multiple - choice question how is the atomic mass determined? its the s…
B. add the number of protons and neutrons
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6. calculate the atomic mass of the unknown element. then identify the …
Problem 6: Atomic mass is approximately 186.21 amu, element is Rhenium (Re). Problem 7: Atomic mass is approximately 115.81 amu, element is Indium (In).
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good safety footwear is provided with: steel toe cap difficult to penet…
- The high top shoe offers more support and protects the Achilles tendon. - The low top shoe is suitable for people that need to kneel down a lot. - Leather safety boots are mainl…
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an atom’s emission of light with a specific amount of energy confirms t…
electrons emit and absorb energy based on their position around the nucleus
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what does the atomic number equal in a neutral atom? the number of prot…
the number of protons and also the number of electrons
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using a cathode ray tube, thomson confirmed that atoms must have an ove…
atoms include particles that have a negative charge.
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good safety footwear is provided with: steel toe cap difficult to penet…
Oil resistant., Soles that provide good grip., Steel toe cap., Nearly impenetrable.
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which scientist and atomic model are correctly matched? bohr - plum pud…
Schrödinger – electron cloud surrounds nucleus
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which subatomic particles determine the overall charge of an atom? □ pr…
B. protons and electrons
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data table 1: temperature reading for freezing point concentration of s…
A. If you increase the amount of salt in water, then it will result in a decrease in the water's freezing - point temperature.
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which subatomic particles determine the mass of an atom? protons, neutr…
protons and neutrons
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safety footwear protects the feet against dangerous substances, falling…
Hazardous substances, Getting caught or crushed, Falling objects
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essay questions. directions: below are essay questions you may encounte…
1. The reactivity increases when moving from an element with atomic number 10 (Neon) to atomic number 11 (Sodium). Neon is a noble gas with a stable electron configuration and low…
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safety glasses resemble ordinary glasses, but the lenses are made of ha…
A. False B. False C. True D. True E. True
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which subatomic particles have a positive charge? □ protons □ neutrons …
protons
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safety glasses resemble ordinary glasses, but the lenses are made of ha…
Welding helmet / visor, Goggles, Over - spectacles, Safety glasses, Face visor
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safety glasses and goggles with activities like drilling, grinding, wel…
Welding helmet / visor, Goggles, Over - spectacles
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with activities like drilling, grinding, welding and sanding, chips and…
Drilling, Welding, Grinding, Sanding
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1. what is the primary component of seawater? 2. name two major ions fo…
1. Water (H₂O) 2. Sodium (Na⁺), Chloride (Cl⁻) 3. A chemical reaction forming carbonic acid (H₂CO₃) 4. Reduces the availability of carbonate ions for shell - building 5. Photosynt…
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1. what is the primary component of seawater by volume? a) dissolved ga…
1. c) Water 2. d) Sodium and chloride 3. b) Increased levels of atmospheric carbon dioxide 4. d) Shellfish 5. a) It decreases
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vocabulary: match the vocabulary word to its definition. answer vocabul…
1. D. 2. C. 3. B. 4. F. 5. A. 6. E.
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which tool on the display settings menu controls the color - scheme of …
C. Environment
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4. an irregularly - shaped object is placed in a graduated cylinder alr…
6.5 × 10⁻¹ g/cm³
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a chemical substance has a decay rate of 7.3% per day. the rate of chan…
a) $N(t)=N_0e^{-0.073t}$ b) 417 g c) - 30.4 g/day d) 9.5 days
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a chemical substance has a decay rate of 7.3% per day. the rate of chan…
417
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a chemical substance has a decay rate of 7.3% per day. the rate of chan…
a) $N(t)=N_0e^{-0.073t}$ b) $416.82$ g c) $-30.43$ g/day d) $9.49$ days
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vocabulary: match the vocabulary word to its definition. 1. air and wat…
1. A. Air and Water Pollution 2. C. Urbanización 3. E. Changing the Flow of Water 4. B. Desertificación 5. A. Deforestation 6. F. Erosion
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physical properties can be used to compare and classify substances. the…
None of the provided options (melting point, density, thermal conductivity) correctly represent the physical property demonstrated by the process of sugar dissolving in water.
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accidental activation of airbags can cause severe injury. most accident…
Physical injuries caused by direct airbag strike or indirect strikes by the objects nearby that were set off by the airbag., Burn injuries caused by the heat released by the chemi…
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which kind of matter is each sample? sample 1 sample 2 sample 3 element…
Sample 1: Element Sample 2: Compound Sample 3: Compound
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to prevent accidental discharge, workers must follow the manufacturers …
There are chemicals inside an airbag. Chemicals are ignited by means of electricity, the chemical reaction generates gas which inflates the airbag, forming a cushion to damp the i…
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equipment and technology quick check which type of glassware would most…
D. a beaker
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1. einstein the dog weighs 74 pounds. how much does he weigh in grams? …
34000 grams 19% $3.73 \times 10^{17}$ inches
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which piece of glassware is cone shaped except for a cylinder - shaped …
B. Erlenmeyer flask
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question 1 - 5 scientists who study elements and how they interact are …
The structure and properties of elements like oxygen and iron