Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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question ch₃ch₂ch₂c(o)ch₂ch₃ is called: select the correct answer below…
3 - hexanone
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question choose the options below that are characteristics unique to al…
They can be used for preserving tissue species, embalming bodies, and sterilizing materials. They each contain a functional group with the structure —CHO. They are named using the…
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question aldehydes and ketones can be synthesized from alcohols through…
oxidation
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choose the options below that are characteristics unique to ketones. (s…
The functional group contains only carbon and oxygen; They are prepared by oxidizing alcohols whose \(-OH\) functional group is located on a carbon atom in the middle of the carbo…
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9- classe les propriétés suivantes dans le tableau : masse, volume, mas…
| Propriétés caractéristiques | Propriétés non - caractéristiques | | --- | --- | | Masse volumique | Masse | | Température de fusion | Volume | | Température d'ébullition | Tempé…
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question identify the options below that are not characteristics of eth…
A. They each contain a carbonyl group. B. Each contains the functional group \(-O -\) attached to hydrogen atoms via single bonds. C. They do not contain oxygen.
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question which of the following statement(s) is/are true about phenol? …
all of the above
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reduction of the following molecule results in the production of what a…
1 - heptanol
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identify the use of jargon in the excerpt by sorting the words into the…
| Not Jargon | Jargon | | --- | --- | | eliminate | air lock, decon cycle, hot side, shower, far door |
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hydrogen bonding and boiling point molecular compounds that have low mo…
Water forms more hydrogen bonds per molecule than \(HF\). In \(H_2O\), each molecule can form two hydrogen bonds (because oxygen has two lone pairs), while in \(HF\), each molecul…
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surface tension variations surface tension is affected by the type of s…
Surfactants reduce surface tension of ink. This allows ink to spread more evenly on paper, resulting in better - quality prints.
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construct the expression for ksp for solid ba3(po4)2 in aqueous solutio…
\(K_{sp}=[Ba^{2 +}]^3[PO_4^{3 -}]^2\)
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question 20 of 20 construct the expression for ksp for solid ba₃(po₄)₂ …
\(K_{sp}=[Ba^{2+}]^3[PO_4^{3 -}]^2\)
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(d) why will the crucible and its contents gain mass as a result of hea…
Because magnesium reacts with oxygen in the air to form magnesium oxide, and the mass of oxygen (from the air) that combines with magnesium is added to the mass of the original ma…
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construct the expression for ksp for solid agcn in aqueous solution. ag…
\(K_{sp}=\frac{[Ag^{+}][CN^{-}]}{1}\)
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12. sucrose is 51.0% oxygen by mass. how many grams of oxygen are in 20…
\(10.2\ g\)
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32 sep construct an explanation why is water (h₂o) a liquid at room tem…
Water (\(H_2O\)) is liquid at room temperature due to strong hydrogen bonding (a result of its polar structure with an electronegative O atom). Carbon dioxide (\(CO_2\)) is non - …
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(d) why will the crucible and its contents gain mass as a result of hea…
The empirical formula of potassium oxide is \(K_{2}O\)
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most of an atoms mass is found in protons and neutrons. a neutron has a…
- Most of an atom's mass is found in protons and neutrons. - The nucleus of an atom is found in the atom's center. - The nucleus of an atom contains at least one proton.
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of the following elements below, which has an electron located in a \p\…
\(S\)
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halogens are highly ______ since they ______ easily to form ions. respo…
reactive, gain 1 electron
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unit 5 comprehensive quiz l which element listed has the greatest metal…
Francium (Fr)
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unit 5 comprehensive quiz l of the following elements, which would have…
Sulfur (S)
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unit 5 comprehensive quiz l of the following elements, which would have…
Oxygen (O)
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unit 5 comprehensive quiz l the table below provides some information a…
Cl (Chlorine - Atomic number 17)
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23. the atomic mass is a decimal number because it is actually an avera…
| Number of protons | Number of neutrons | Number of electrons | Atomic mass | Element | | --- | --- | --- | --- | --- | | 6 | 6 | 6 | 12 | Carbon (\(C\)) | | 6 | 8 | 6 | 14 | Car…
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which letter represents one of the elements in the transition metal fam…
C
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which of the following elements is a halogen at room temperature and is…
Chlorine
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unit 5 comprehensive quiz l i am an element located in period 5. who am…
Iodine.
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unit 5 comprehensive quiz l i am an element located in period 5. who am…
Iodine
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unit 5 comprehensive quiz l i am an element located in period 5. who am…
Iodine
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unit 5 comprehensive quiz l using a periodic table, classify the elemen…
Alkaline earth metal
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part b which element would be in the same family as lithium? a calcium …
C. sodium
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unit 5 comprehensive quiz l which element is malleable and ductile? o o…
Ag
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unit 5 comprehensive quiz l which elements are examples of nonmetals? b…
Argon, sulfur, oxygen
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which list contains of elements that have the most similar chemical pro…
Na, K and Rb
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which list contains of elements that have the most similar chemical pro…
# Brief Explanations[SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][LLM SSE On Failure]
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part a look at the model of a lithium atom. the red and blue subatomic …
- Part A: A. protons and neutrons; mass number - Part B: (No correct option shown in the provided Part B choices. If we assume the intended correct element from common knowledge, …
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unit 5 comprehensive quiz l which three elements have properties most s…
Magnesium, calcium, and strontium— which are adjacent to each other in the second column, or group, of the periodic table.
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what is the atomic number of the atom shown? a 8 b 12 c 18 d 39.948
C. 18
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unit 5 comprehensive quiz l which of the following elements has the sma…
\(Cl\)
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perform the following metric - metric conversion. 1900 μl to ml 1900 μl…
\(1.9\)
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the 1995 nobel prize in chemistry was shared by paul crutzen, f. sherwo…
\(-19.85\)
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use the passage to answer the question. with that reflection gortsby ro…
the falling action
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molecules of hydrogen chloride (hcl) are shown in diagram x and diagram…
D. Diagram Y, because the dashed lines show that the positive end of one molecule is attracted to the negative end of an adjacent molecule.
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the lewis diagram of c₂h₅cl is shown. which of the following is a type …
A. Dipole - dipole
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question 13 of 15 classify the molecules based on whether the molecule …
- $\Delta H_f^{\circ}$ is equal to zero: $Hg(l)$, $Br_2(l)$, $I_2(s)$, $Cl_2(g)$ - $\Delta H_f^{\circ}$ is not equal to zero: $Br_2(g)$, $Br_2(s)$, $I_2(g)$, $Hg(s)$
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the lewis diagram of c₂h₅cl is shown. which of the following is a type …
D. The student's claim is incorrect; the high boiling point is due to the bonds, that must be overcome.
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question 12 of 15 the 1995 nobel prize in chemistry was shared by paul …
\(-19.85\space kJ\)
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given these reactions, where x represents a generic metal or metalloid …
\(-1064.2\,\text{kJ}\)
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check all the examples of elements: select all correct options hydrogen…
Hydrogen (\(H_2\)), Nitrogen (\(N_2\)), Sulfur (\(S\))
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consider the two reactions. 2nh₃(g) + 3n₂o(g) → 4n₂(g) + 3h₂o(l) δh° = …
\(592\space kJ\)
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where can you look to find out if something is an element?
The periodic table.
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what are the 2 types of mixtures? check all that apply: select all corr…
homogeneous mixtures, heterogeneous mixtures
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what are the 2 types of pure substances? check all that apply compounds…
compounds, elements
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what are the 2 major categories of matter? check all that apply: select…
pure substances, mixtures
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given the thermochemical equations a(g)→b(g) δh=80kj b(g)→c(g) δh=−120k…
For \(3A(g)\to3B(g)\), \(\Delta H = 240\space kJ\) For \(B(g)\to A(g)\), \(\Delta H=-80\space kJ\) For \(A(g)\to C(g)\), \(\Delta H=-40\space kJ\)
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what is water commonly referred to as due to its ability to dissolve ma…
Universal solvent
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how is a homogeneous mixture characterized? evenly mixed unevenly mixed…
Evenly mixed
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what type of mixture is vegetable soup an example of? homogeneous heter…
Heterogeneous
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which of the following is made up of only one type of atom? element mix…
Element
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1/5 what are the fundamental units that make up all substances? mixture…
B. Atoms
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what is the purpose of using dish soap when washing dishes? ○ to make t…
to remove grease and food particles
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the temperature at which a liquid becomes a solid is called its freezin…
mercury
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what ingredient adds unique texture and flavor? vanilla extract salt nu…
Nuts
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the function of leavening agents is to... add structure binding and col…
Make chemical or physical change - Ex. air bubbles
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the diagram represents a sealed rigid container of a mixture of gases w…
B. 0.60 atm
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what ingredient chemically reacts twice? (think pancakes) flour baking …
Baking Powder
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5. a spot of ink is placed near the bottom of a piece of polar chromato…
D. Substance Y is more polar than substance X.
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this ingredient helps to blend, bind, and cause chemical reaction. liqu…
Liquids
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after the mixture is poured, the initial mass of the material on the fi…
D. \(\frac{6}{40}\times 100\)
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which of the following particle diagrams is the best model for a sample…
D
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1. which of the following diagrams contains a representation of a compo…
C.
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what is type of gas is released by yeast or chemical leaveners? oxygen …
Carbon dioxide
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unit 3 test (functions of baking ingredients) the function of eggs in b…
Add flavor, binding, leavening
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unit 3 test (functions of baking ingredients) the function of flour is …
Create structure and absorb liquids
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the function of sugar gives baked goods tenderness, protein, and color …
Sweetness, and color change (browning)
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7. when 78.2 g of potassium react with magnesium chloride, the products…
\(95.3\space g\)
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6. explain why the evaporation of water is a physical change and not a …
The evaporation of water is a physical change because no new substances are formed. The water changes from liquid to gas (water vapor), but its chemical formula ($H_2O$) remains u…
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d. it has a fixed composition. 5. what is one way that compounds and mi…
Alike: Both consist of two or more substances. Different: Compounds have a fixed composition (chemically combined), mixtures have a variable composition (physically combined).
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in a science lab, cash mixes two clear liquids together in a beaker. bu…
A chemical change occurred, so if Cash heats it, the white solid will remain.
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which best explains why making a pancake from batter is an example of a…
A new substance forms when the batter is cooked.
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a researcher is designing a laboratory experiment to determine whether …
First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X…
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i have five more protons than the heaviest metalloid in the fourth peri…
Rubidium (Rb)
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directions: for the three elements below, fill in the missing informati…
| Element | Atomic \# (\(Z\)) | \(\#\) of Protons | \(\#\) of Electrons | \(\#\) of Neutrons | Atomic Mass (\(A\)) | |---|---|---|---|---|---| | \(O\) | \(8\) | \(8\) | \(8\) | \(…
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a scientist is examining an unknown solid. which procedure would most l…
Exposing it to a flame to see if it catches on fire.
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11. identify the following as an example of physical change (p) or a ch…
11. a. \(P\) b. \(P\) c. \(C\) d. \(C\) 12. a. \(E\) b. \(C\) c. \(E\) d. \(C\) 13. a. \(He\) b. \(Ho\) c. \(He\) d. \(Ho\)
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which of the following best predicts the type of bond that forms betwee…
A. nonpolar covalent
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which one of the following violates the octet rule? a cbr₄ b nf₃ c pcl₃…
D. \(AsF_5\)
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9. identify the following diagrams as an element, a compound or a mixtu…
9. a. Compound; b. Element; c. Mixture 10. a. P; b. C; c. P; d. C
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in a science demonstration, a teacher mixed zinc (zn) with hydrogen chl…
One or more new substances formed.
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consider the bicarbonate ion (also called the hydrogen carbonate ion). …
A. two equivalent resonance forms.
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henry mixed salt and water together in a cup until he observed a clear …
He is correct. Dissolving salt in water is a physical change, but evaporating the water is a physical change. Formation of a solid is evidence that a physical change.
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the correct dot formulation for nitrogen trichloride has: a 2 n - cl bo…
E. 3 N - Cl bonds and 10 lone pairs of electrons.
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jenna took an open bowl of leftover mashed potatoes from the refrigerat…
a change of odor
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the molecular geometric shape of icl3 molecule is best described as a t…
C. T - shaped
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in the lewis structure for the of₂ molecule, the number of lone pairs o…
D. 2
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what is the total number of electrons in the correct lewis dot formula …
C. 26
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which of the following contains an atom (other than hydrogen) which lac…
A. \(BH_3\)
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chapter 10 test 1. what do we call a heterogeneous mixture in which the…
1. a. Suspension 2. b. Malleability 3. a. Suspension 4. b. It appears the same throughout (you can't see different particles)