Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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b. choose the word or phrase that best completes each sentence. write i…
1. (c) gas 2. (c) freezing point 3. (a) evaporation 4. (c) boiling point 5. (a) absorbs heat energy Challenge A: Answers will vary based on the substances chosen and references us…
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11/22 what is the atomic number? the number of atoms in a molecule the …
The number of protons in an atom’s nucleus
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what is the ph range of the ph scale? 1-7 0-7 0-14 7-14
C. 0-14
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the reaction hcl + naoh → h₂o + nacl is what type of reaction? reversib…
B. exchange
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the significance of waters high heat capacity is: it results in water b…
It allows water to absorb and release large amounts of heat with little temperature change.
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letter b indicates letter c indicates the how many protons are in this …
How many protons are in this element? 12 If this element is neutral, does it have the same amount of electrons? Yes
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in hydrolysis reactions, compounds react with glucose, causing decompos…
E. water, causing decomposition
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word activity use the clues to complete the crossword puzzle. across 1.…
1. T 2. F, Evaporation 3. T 4. F, higher 5. F, solid to a gas
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the formation of a complex carbohydrate is what type of reaction? hydro…
C. dehydration synthesis
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two balloons hold two different gases. the gases are held at the same p…
the mass of each gas
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the molecular formula for glucose is: c6h12o6 c2h5oh c12h22o11 ch4
A. C6H12O6
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atoms become ions when electrons are gained or lost. all atoms are ions…
electrons are gained or lost.
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if a pair of electrons is unequally shared between two atoms, a(n) ____…
polar covalent
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the octet rule for valence shell is: atoms always have eight electrons …
Atoms tend to gain, lose or share electrons to have eight electrons in their valence shell.
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when atoms complete their outer electron shell by sharing electrons, th…
covalent bonds.
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a. there are three statements beside each picture. write t or f in the …
A. 1. F 2. T 3. T 4. T 5. T 6. F B. 1. Evaporation 2. Condensation 3. Sublimation (reverse process related to the ice - formation on window)
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the chemical behavior of an atom is determined by the size of the atom.…
outermost electron shell.
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a thought on the inestimable blessing of reason by mercy otis warren wh…
There is an absence of a clear rhyme scheme.
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what type of bond is present in the structure of water? metallic bond h…
D. Polar covalent bond
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what allows water to dissolve many substances? its varying density its …
Its polarity and hydrogen bonding
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water molecules are formed by ________. polar covalent bonds nonpolar c…
polar covalent bonds
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what ions are formed when water dissociates? hydrogen ions ( h+ ) hydro…
D. both ...... hydrogen ions ($H^+$) and hydroxide ions ($OH^-$)
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isotopes of an element differ in the number of energy shells. protons. …
E. neutrons
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the \atomic weight\ of an atom reflects the average number of ○ protons…
protons + neutrons.
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the \atomic number\ of an atom is determined by the number of ______ it…
D. protons
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modeling pure substances not all molecules are compounds. - oxygen (o₂)…
A. they are made up of one type of element
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compound lattice energy (kj/mol) naf 930 mgf2 2978 the energy required …
D. The charge of the Mg cation is larger than that of the Na cation.
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the particle - level diagram above represents the structure of solid kf…
A diagram with larger inter - ionic distances in $KCl$ compared to $KF$ would best explain why the density of $KCl$ is less than that of $KF$ despite its greater molar mass.
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which of the following is an example of a covalent compound? calcium ox…
C. Ammonia, $NH_3$
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which of the following correctly indicates whether the solid represente…
C. It does not conduct electricity because its ions cannot move freely within the solid.
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what are the three main groups into which elements can be classified us…
D. Metals, metalloids, and nonmetals
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most of the elements on the periodic table are classified as ________. …
D. Metals
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models of compounds · salt (nacl) is a compound made of two different e…
The black lines represent chemical bonds.
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identify each of the following as an element, a compound, or a mixture:
(a) Compound (b) Compound (c) Mixture
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how are periods on the periodic table arranged? randomly, with no speci…
D. Horizontally, numbered from 1 to 7
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what is the term used for the naming of compounds? nomenclature identif…
Nomenclature
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what is the charge of the phosphate ion?
3-
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what is the charge of hydrogen when it is treated as a metal in compoun…
+1
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arrange these ionic compounds in order of increasing magnitude of latti…
For lattice energy: \(KBr<KCl<SrO<CaO\) For melting point: \(KBr<KCl<SrO<CaO\)
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which elements are classified as metalloids on the periodic table? b, s…
A. B, Si, Ge, As, Sb, Te, At
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models of elements what does each circle represent?
An atom of the element.
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circle the compound in each pair with the greater lattice energy (in ma…
A. NaCl B. LiF C. MgO D. $Fe(OH)_3$ E. $Na_2O$ F. MgO
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when used as recommended, chemicals are: left in storage; hazardous; sa…
For the first question: Safe and effective For the second question: C. Essential
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what is the highest level of toxicity? warning caution danger question …
Question: What is the highest level of toxicity?
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what is the main difference between metals and non - metals in terms of…
Metals are good conductors, nonmetals are nonconductors
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in naming a metal/nonmetal compound, which of the following is true? pr…
D. The cation appears first in the name
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in the stock system, how is the charge of the cation indicated? by a su…
D. By a Roman numeral after the name
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what is the charge of a compound if the sum of positive and negative ch…
It is not a compound
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the atoms along the staircase are called noble gases metalloids metals …
metalloids
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in the symbol $\frac{a}{z}x$, what does z represent? atomic number mass…
Atomic number
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normal rain, which has not been contaminated by pollutants, has what ph…
Slightly acidic
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how is your chemistry class? mi clase de biología es aburrida. mi clase…
Mi clase de química es difícil.
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higher temperatures cause faster evaporation from lakes and oceans. whi…
Some areas may get more rain while others have droughts.
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5 multiple choice 1 point what is temperature a measure of? the speed o…
5. The average kinetic energy of particles in an object 6. Heat is the movement of energy; temperature is the measure of average kinetic energy.
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translate to spanish: how is your chemistry class?
¿Cómo es tu clase de química?
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comprehension check questions chem 1.3_matter 1. what is the definition…
1. Chemistry is the scientific study of the properties and behavior of matter, including its composition, structure, and reactions. 2. Matter is anything that has mass and occupie…
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a chemist has an empty cylinder with a height of 30 cm and a cone - sha…
10 cm
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1. *classify each particle above as an element, molecule, compound, or …
- First particle: Element, Molecule; Explanation: Composed of two identical atoms. - Second particle: Compound, Molecule; Explanation: Different atoms are bonded. - Third particle…
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5. on the map provided below, what does the color purple represent? a. …
5. No valid answer based on given options and lack of purple reference in map. 6. D. Hittite sphere of influence 7. E. Battle site (assuming typical ancient - world map symbolisms…
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fill out the chart: na br kr ca s ga sb atomic # period group # family …
| Element | Atomic # | Period | Group # | Family Name | # of valence electrons | # protons | Metal, non - metal, metalloids | Conducts electricity? (yes/no) | State at room temp |…
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a sample contains 800 mg of this isotope. combine the first two equatio…
$S = 800(0.766)^y$
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the half - life of sodium - 22 is 2.6 years. a sample contains 800 mg o…
B. \(S = 800(0.5)^h\)
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what is the correct order of processes in the accretion of planetesimal…
Masses of matter form around dust grain, masses of matter collide, atoms and molecules are added to dust grain.
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beautiful? the answer lies in the mathematical principle of the golden …
The question encourages the reader to challenge preconceptions they might have about math being irrelevant to standards of beauty.
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complete the following table about isotopes. | isotope name | atomic # …
| Isotope name | atomic # | mass # | # of protons | # of neutrons | # of electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | uranium - 235 | 92 | 235 | 92 | 143 | 92 | | ura…
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here are three isotopes of an element: ₆¹²c ₆¹³c ₆¹⁴c the element is th…
Carbon; Atomic number; Mass numbers; 6 protons, 6 neutrons; 6 protons, 7 neutrons; 6 protons, 8 neutrons; 92, 235, 92, 143, 92; 92, 238, 92, 146, 92; 5, 10, 5, 5, 5
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elaborate atoms are the building blocks for every living and non - livi…
| Element Name | Element Symbol | Mass Number | # of Protons | # of Neutrons | # of Electrons | |---|---|---|---|---|---| | Hydrogen | H | 1 | 1 | 0 | 1 | | Carbon | C | 12 | 6 | …
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what formula would you use to calculate the mass of fermium - 253 remai…
$6.25$ g
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fermium - 253 has a half - life of three days. a sample contains 400 g.…
12.5
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complete the following for each element: element # of valence electrons…
| Element | # of valence electrons | # electron levels | Protons | Neutrons | Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | Helium | 2 | 1 | - | - | - | | Magnesium | …
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the following bohr model diagrams describe the number of electrons in d…
(No models shown to pick from, but the process is to find the one violating electron - shell capacity rules). For the second part: valence
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atoms, ions, and isotopes study questions name jeremiah watson elements…
1. atoms 2. atomic number 3. protons 4. protons, neutrons 5. electron 6. True 7. False
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directions: read the following sections. once you have completed the re…
1. An element consists of only one type of atom. 2. Protons, neutrons, electrons. 3. By chemical bonds. Ionic bonds transfer electrons; covalent bonds share electrons. 4. Atoms of…
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which list only includes terms that describe water? (1 point) compound,…
compound, molecule, pure substance
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which term best describes a milkshake that contains pieces of chocolate…
C. heterogeneous mixture
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while camping, you make a snack over a campfire. you roast a marshmallo…
The melting of the chocolate is a physical change. The toasting of the marshmallow is a chemical change. The burning of the wood for the campfire is a chemical change. The digesti…
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why is it difficult to classify dissolving as simply a physical or a ch…
Some substances release energy when they dissolve, and some absorb energy.
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2. the atomic number tells you the number of protons in one atom of an …
2. Protons; Electrons; Same 3. Mass number; Nucleus 4. Neutrons; Atomic number; Mass number
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which property of matter is an extensive, rather than an intensive, pro…
mass
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5. give the symbol and number of protons in one atom for each of the fo…
| Element | Symbol | # of protons | | ---- | ---- | ---- | | Copper | Cu | 29 | | Oxygen | O | 8 | | Mercury | Hg | 80 |
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neutrons in the of the atom. 4. the mass number is used to calculate th…
4. nucleus; neutrons; atomic number; mass number 5. No elements listed to answer this part.
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part 2: answer these: 1. the subatomic particle with no electrical char…
1. Neutron 2. Proton 3. Electron 4. Proton, Electron 5. Proton 6. Nucleus 7. Proton, Neutron
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8.complete the following table symbol atomic number number of protons n…
| Symbol | Atomic Number | Protons | Neutrons | Electrons | Mass | | ---- | ---- | ---- | ---- | ---- | ---- | | F | 9 | 9 | 10 | 9 | 19 | | P | 15 | 15 | 16 | 15 | 31 | | Si | 14…
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does potassium permanganate diffuse more rapidly through water or throu…
It diffuses more rapidly through water, because there are no particles to slow the movement of dye.
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translate to spanish: \when is your chemistry class?\ \¿cuánto dura tu …
"¿Cuándo es tu clase de química?"
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7. name the element which has the following numbers of particles. be sp…
1. Fe (iron), mass - number 55 2. I (iodine), mass - number 127 3. H (hydrogen) 4. Yes 5. No 6. Yes
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problem 21: tell whether this argument is a valid or invalid deduction.…
Invalid
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gases under pressure quick check. the ideal gas law is represented by p…
It would increase.
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didnt realize what an earnest look you had on your face. it was truly b…
He sees the world as a complex, interconnected place that both influences and is influenced by individuals.
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gases under pressure quick check two balloons hold two different gases.…
the mass of each gas
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add these measurements, using significant digit rules: 56 mg + 3.211 g …
# Explanation: ## Paso1: Convertir mg a g Sabemos que 1 g = 1000 mg, entonces 56 mg = 56/1000 g = 0.056 g. ## Paso2: Realizar la suma 0.056 g+3.211 g = 3.267 g. ## Paso3: Aplicar …
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what would be the name of the covalent compound? monocarbon monoxide ca…
B. carbon monoxide
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agec 242, chapter 2 deciding to produce certified organic beef rather t…
tactical management
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what is the formula for trisulfur hexafluoride?
$S_3F_6$
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11. bruno sees his lab - partner marish sneak into the science storage …
Yes. Maria should not go in the science storage closet.
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6. give the symbol and number of electrons in a neutral atom of: elemen…
| Element | symbol | electrons | | ---- | ---- | ---- | | Uranium | U | 92 | | Chlorine | Cl | 17 | | Boron | B | 5 | | Iodine | I | 53 | | Antimony | Sb | 51 | | Argon | Ar | 18 |
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multiple - choice question what types of elements make up covalent bond…
Non - metal atoms
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multiple - choice question what types of elements make up covalent bond…
nonmetal + nonmetal
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11) drag and drop the terms with the definitions. subatomic particles t…
subatomic particles that do not have an electric charge - neutrons positively charged subatomic particles - protons negatively charged subatomic particles - electrons the center o…
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(hue is a colors name.) split - complementary is made up of three hues.…
Describes split - complementary color scheme.