Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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snc1w1 - grade 9 science 0.1.2 whmis and hhps - practice homework 1) ma…
i. D1 ii. D2 iii. B iv. A v. (No match in given symbols) vi. E vii. D3 viii. B ix. F x. C
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3) name 4 useful pieces of information that you should always check you…
3) Product name, hazard symbols, precautionary statements, supplier contact information. 4) No. There are exemptions for certain consumer products, small - quantity containers, an…
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8. isotope mass (u) fractional abundance cr - 50 49.946 (0.0435) 4.35% …
# Explanation: ## Step1: Convert percentages to fractions I-127[SSE Completed, Client Connection Error][SSE onError error]
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covalent bonding - examples hz 1 hydrogen atoms h • h •→ h : h h - h cl…
Lewis structure: $H:\underset{H}{\overset{H}{\underset{\cdot \cdot }{\overset{\cdot \cdot }{C}}}}:H$, Structural formula: $\begin{matrix} & & H\\ & & |\\ H - & C & - H\\ & & |\\ &…
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what is the trend in electronegativity? increases - down a group increa…
Decreases - down a group, Increases - across a period
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1 identify two molecules represented in the models below.
The first model could represent a mono - atomic element like argon. The second model could represent a di - atomic compound like water.
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what family do atoms try to be like? aka what family or group do they t…
Noble Gases
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what happens to electron affinity as you go across a period? increases …
Increases
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what happens to electron affinity as you go down a group? decreases inc…
Decreases
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what is electron affinity? the distance between the nucleus and the edg…
The ability of an atom to accept an electron.
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what happens to ionization energy going down a group? decreases increas…
Decreases
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what is ionization energy? the distance between the nucleus and the edg…
The energy needed to remove an electron.
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1. which subatomic particles change when it becomes an ion? a. proton b…
1. C. Electron 2. A. Proton 3. B. 6 protons, 7 electrons 4. Protons and neutrons make up most of the atom's mass. They are located in the nucleus. 5. N = 2
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what happens to atomic radius as you go across a period? increases decr…
Decreases
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what happens to atomic radius as you go down a group? increases decreas…
Increases
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hydrogen bonds are considered the strongest bonds in nature true false
False
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what is atomic radius? the ability to attract electrons. the distance b…
The distance between the nucleus and the edge of the atom.
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chemical safety & gasoline awareness – student worksheet name: ________…
s address chemical safety practices, including gasoline hazards, vapor ignition, safe handling, MSDS, PPE, disposal, and emergency responses based on standard chemical safety prot…
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which element is found in group 2 h rb ra multiple - choice question
Ra
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the group number indicates the number of valence electrons an atom has.…
True
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the period number corresponds to the number of energy shells/levels in …
True
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multiple - choice question what are periods? vertical columns horizonta…
B. Horizontal rows
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what is heat capacity? the amount of water needed to raise a substances…
# Breve explicación: La capacidad calorífica es la cantidad de energía necesaria para elevar la temperatura de una sustancia, lo que implica que las moléculas de la sustancia se m…
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what does adhesion cause water to do? stick to other polar substances f…
# Breve explicación: La adhesión es la fuerza de atracción entre moléculas de diferentes sustancias. El agua es una sustancia polar y la adhesión hace que se pegue a otras sustanc…
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which type of bonds in water molecules contribute to high surface tensi…
A. Hydrogen bonds
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multiple - choice question what makes up the atomic mass, choose all th…
Protons, Neutrons
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what is cohesion as defined in the context of water molecules? the attr…
# Breve explicación: La cohesión es la fuerza de atracción entre moléculas del mismo tipo. En el caso de las moléculas de agua, se refiere a la atracción entre moléculas de agua. …
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which statement is true about water molecules? water molecules move ran…
Water molecules move randomly around each other.
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what property of water enables many substances to be dissolved in it? i…
# Explicaciones breves: El agua es una molécula polar, lo que significa que tiene una región con carga parcial positiva y otra con carga parcial negativa. Esto le permite interact…
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which two compounds from the list (ccl₄, nh₃, o₂, hf) are least soluble…
# Explicación: ## Paso 1: Comprender la solubilidad en agua La solubilidad en agua se basa en la interacción entre las moléculas del soluto y el agua. El agua es un líquido polar,…
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what does the term \cohesion\ refer to in the content of the diagram? a…
D. The attraction between water molecules themselves
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what property of water allows it to dissolve many different substances?…
# Breve explicación: El agua es conocida como el disolvente universal debido a su capacidad para disolver muchos tipos diferentes de sustancias. Esto se debe a su naturaleza polar…
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multiple - choice question why is the nucleus positive? positive - beca…
Positive - Because of protons that have a positive charge
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what does the term \adhesion\ refer to as illustrated in the diagram? t…
The attraction between water molecules and other substances
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what is the best definition of strategy? (1 point) o a way to introduce…
a plan for achieving something
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philip wanted to make cheese from milk curds. he knew that milk forms c…
a control group
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reactivity quick check which elements would react most easily with each…
an element with a high electronegativity and an element with a single valence electron
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reactivity quick check how are reactivity and electronegativity related…
An element will be more reactive if it has a very high or very low electronegativity.
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which elements on the periodic table are the least reactive? (1 point) …
the group with helium at the top
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reactivity quick check which element would have the lowest electronegat…
an element with a small number of valence electrons and a large atomic radius
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multiple - choice question what happens to atomic radius going down a g…
B. Increases
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true or false: contamination can be caused by spraying chemicals near f…
True
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atoms family atomic math challenge oxygen 15.999 atomic number equals t…
Atomic number equals the number of protons or electrons. Atomic mass equals the number of protons + neutrons. For oxygen: Atomic # = 8 For zinc: Atomic # = 30 For lithium: Atomic …
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if you know only the following information can you always determine wha…
a. Yes b. No c. Yes d. No
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why does decreasing the temperature generally decrease the reaction rat…
Decreases the speed of the molecules, which decreases the chance and energy of collisions
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activation energy describes the amount of energy required for a success…
A. faster rate of reaction.
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name the element which has the following numbers of particles: a. 26 el…
a. Iron (Fe) b. Iodine (I) c. Helium (He) d. Calcium (Ca) e. Lead (Pb) f. Hydrogen (H)
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which of the following would most likely increase the rate of gasoline …
Mixing gasoline and oxygen
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which of the following would most likely increase the rate of tnt explo…
B. Increasing the temperature
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9. the following chart lists the atomic radii of elements in the first …
220
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9. give the symbol and number of neutrons in one atom of: (to get “mass…
Barium: Ba, 81 Carbon: C, 6 Fluorine: F, 10 Europium: Eu, 89 Bismuth: Bi, 126 Hydrogen: H, 0 Magnesium: Mg, 12 Mercury: Hg, 121
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vocabulary: define the following terms in your own words. 1. capillary …
1. Capillary Action: The movement of liquid in narrow spaces due to adhesive and cohesive forces. 2. Polar Molecule: Molecule with uneven electron - distribution and distinct posi…
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which of the following describes a reaction with a very fast rate of re…
Very quickly moves to an equilibrium ratio of a few products and lots of reactants
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which of the following correctly describes how reaction rates relate to…
The rate of a reaction describes how quickly a chemical reaction moves to its equilibrium ratio of products and reactants.
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which of the following describes a reaction with a slow rate of reactio…
Slowly moves to an equilibrium ratio of a lot of products and a few reactants
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in the video: when the soap was added to the water, the penny could hol…
less drops of water because the soap broke the hydrogen bonds
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which of the following describes a reaction with a slow rate of reactio…
Slowly moves to an equilibrium ratio of a lot of products and a few reactants
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question 4 20 pts waters ability to \stick\ to other substances is due …
A. adhesion
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question 3 20 pts water’s ability to \stick\ to itself is due to ______…
B. cohesion
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question 2 20 pts water is a polar molecule which means it has ________…
D. a slightly positive charge at one end and a slightly negative charge at the other end.
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question 1 20 pts water is made up of _______. 1 water atom and 2 oxyge…
C. 2 Hydrogen atoms and 1 Oxygen atom
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initial volume final volume which of the following is the best estimate…
3.60 mL
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give the symbol and number of electrons in a neutral atom of: uranium, …
| Element | Symbol | Number of Electrons | Number of Neutrons | | ---- | ---- | ---- | ---- | | Uranium | U | 92 | 146 | | Boron | B | 5 | 6 | | Antimony | Sb | 51 | 71 | | Chlori…
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the rate of a reaction describes what? how many products are formed how…
How quickly a reaction happens
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this image shows two setups for a reaction between magnesium and an aci…
High Surface Area setup
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the more collisions that occur... the more products will exist at equil…
the more products will exist at equilibrium.
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which of the following is included in the nature of reactants factor? a…
D. Number of reactants
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which of the following would most likely decrease the rate of gasoline …
C. Decreasing the concentration of oxygen in the air
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review these effective/successful and ineffective/unsuccessful collisio…
The first collision has the incorrect orientation and may or may not also have insufficient energy.
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surface area of reactants is part of the nature of reactants. would you…
B. Increase! The greater the surface area, the greater the chance for collisions.
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this image shows two setups for a reaction between magnesium and an aci…
B. High Surface Area setup!
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review these effective / successful and ineffective / unsuccessful coll…
The first collision has the proper orientation, while the molecules are not correctly oriented in the second collision.
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activation energy describes the amount of energy required for a success…
A. faster rate of reaction.
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which solids have particles arranged in a regular repeating pattern?
# Breve explicación: Los sólidos cristalinos tienen partículas que se organizan en un patrón regular y repetitivo. Esto se debe a la estructura ordenada de sus átomos, moléculas o…
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a is essentially an electron carrying a positive charge. you have corre…
positron
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give the symbol and number of protons in one atom of: lithium, iron, ox…
Bromine: Br, 35 Copper: Cu, 29 Mercury: Hg, 80 Helium: He, 2 Chlorine: Cl, 17 Iodine: I, 53 Xenon: Xe, 54
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give the symbol and number of protons in one atom. lithium iron oxygen …
Lithium: Li, 3 Iron: Fe, 26 Oxygen: O, 8 Krypton: Kr, 36
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chemical bonding jewelers use gems in jewelry because of their appearan…
1. Gems: Hard, high - luster, brittle, various colors. Metals: Malleable, ductile, good conductors, metallic luster. 2. In metals, metallic bonds with delocalized electrons allow …
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question 1 of 10 which receptors help monitor for blood pressure change…
C. Mechanoreceptors
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6. what type of charge does an electron have? 7. which two subatomic pa…
6. Negative charge 7. Protons and neutrons
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objective: you will explore the unique properties of hydrogen bonds and…
Shade the large circles (oxygen atoms) red and the small circles (hydrogen atoms) white. Label the oxygen atoms with $\delta^-$ and the hydrogen atoms with $\delta^+$. Label the s…
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the atomic radius of a cesium atom is 0.000298 micrometers. round this …
\(3\times10^{-4}\)
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how is an atoms net charge determined? a by the size of the atomic nucl…
B. By the relative number of protons and electrons.
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a neutral atom of lithium has 3 protons. what can you infer about the n…
The lithium atom has lost an electron, so it now has 3 protons and 2 electrons.
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objective: you will explore the unique properties of hydrogen bonds and…
Shade oxygen atoms red and hydrogen atoms white. Mark $\delta-$ on oxygen atoms, $\delta+$ on hydrogen atoms. Label solid lines as covalent bonds and dashed lines as hydrogen bond…
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what term is introduced in lesson 3 to describe the push/pull interacti…
A. Force(s)
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looking at the same nonmetal group on the periodic table, how does the …
The period 2 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a closer electron shell.
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regular chemistry instructions: using your notes, and periodic table an…
1a. As 1b. As (assuming same elements as 1a) 1c. Sc 1d. O 1e. At 2a. Na 2b. P, S 2c. Si 2d. F, Cl 2e. He 2f. Ag, Cu 2g. Cs 2h. Na, Cs 2i. O 3a. The energy required to remove an el…
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exposure of the skin to heat, chemicals, or electricity may result in m…
C. burns
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11 multiple choice 1 point what is the most common size for phillips sc…
11. 2 12. The date the chemical was originally patented
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learning study guide you will want to have an understanding of the voca…
1. Pavlov's study demonstrated classical conditioning and how behaviors can be learned through association. 2. - Initial stage of learning; response is first established and gradu…
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a 54.0 - kg cheetah accelerates from rest to its top speed of 30.5 m/s.…
(a) $25116.75$ J (b) $6.0$ calories
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chemical bonding jewelers use gems in jewelry because of their appearan…
1. | Gems | Metals | |--|--| | Hard, brittle, high refractive index (luster) | Malleable, ductile, good conductors of heat and electricity | 2. In metals, delocalized electrons in…
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substance chemical formula element 1 symbol; metal/non metal element 2 …
# Explanation: ## Step1: Identify elements and bonding type for sulfur dibromide Sulfur dibromide has formula $SBr_2$. Sulfur ($S$) is a non - metal and bromine ($Br$) is a non - …
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9. how many protons, neutrons and electrons are in this element? 10. la…
Protons: 9, Neutrons: 10, Electrons: 10
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nancy has a home - based business selling herb and spice mixes. she is …
770 grams of French sea salt 330 grams of dried herbs
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for a college chemistry experiment, students need to prepare a solution…
8.6
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a teaching assistant at a university needs 28% acid solution for her cl…
75
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show how many valence electrons each of the following elements have usi…
Sulfur: 6 valence electrons, dot - diagram with 6 dots around 'S' Strontium: 2 valence electrons, dot - diagram with 2 dots around 'Sr' Silicon: 4 valence electrons, dot - diagram…
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substance;element 1 symbol; metal/nonmetal;element 2 symbol; metal/nonm…
Completed table as above.