Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
- fill in the meaning of each exposure limit statement: * \\(3\\text{ mg/…
- drag and drop into the sentence. an atom has a central that contains an…
- two elements can have the same number of protons. false true
- changing the number of protons causes the element to change. true false
- carbon has a mass number of 12 and atomic number of 6. how many neutron…
- atomic number 6 corresponds to: helium carbon oxygen magnesium
- how do you calculate neutrons? electrons + protons mass number - atomic…
- more ions cause conductivity to be... select one: a. higher b. lower c.…
- conductivity measures... select one: a. electrical current flow through…
- which are valid ph measurement tools? select one: a. indicator, meter, …
- the typical ph scale ranges from... select one: a. 0-14 b. 1-10 c. 0-10…
- more \\(h^+\\) ions means the solution is... select one: a. more acidic…
- question 10 not yet answered points out of 1.00 flag question ph measur…
- cohesion occurs between... select one: a. same molecules b. different m…
- adhesion occurs between... select one: a. different molecules b. same m…
- question 7 not yet answered points out of 1.00 flag question 1 ml of wa…
- 1 \\text{ cm}^3 \\text{ of water equals...} select one: a. 1 \\text{ ml…
- spectrophotometers measure... select one: a. light absorption b. pressu…
- naming ionic & covalent compounds name
- types of chemical reactions identify each of the reactions below as one…
- decomposing a schema into bcnf * let \\(r\\) be a schema \\(r\\) that i…
- question 14 in addition to academic skills, succeeding in college invol…
- exercise 5.56 - enhanced - with feedback enter the formula for the comp…
- volume of each unknown #(1 or 2) ______ size of acid sample = 10.0ml da…
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plass-10rep, ads_fes pre.t 00-024-0076 00-001-1053 position °2θ (copper…
The experimental sample **"Plass-10rep, ADS_FeS pre.T"** is a match for the reference pattern **00-024-0076** (Iron Sulfide, \( \text{FeS} \)). The primary matching peak is locate…
- 3. provide a detailed stepwise electron-pair movement arrow-pushing mec…
- 1. what is the correct practice for minimizing exposure during a hazard…
- four properties of water are listed. 1. it has high thermal conductivit…
- which of the following is a physical property? flammability heat of com…
- corrosion environmental flame flame over circle exclamation mark skull …
- ghs new terms: hazard class signal word hazard category hazard statemen…
- what is a substance that gives off high-energy particles or rays scanne…
- 10. for the reaction at equilibrium: \\(2\\text{no}_{\\text{(g)}} + \\t…
- the following diagram refers to questions 5 and 6 5. the interval repre…
- 1. determine the rate of the following reaction if at 25°c 0.55 g of \\…
- part ii 1. when a 1.0 m kcl solution is electrolyzed using silver elect…
- pharmacist chemical reaction: tums reaction description a substance con…
- part ii 1. when a 1.0 m kcl solution is electrolyzed using silver elect…
- 10 multiple choice 1 point which of the following elements have a tende…
- 1 multiple choice 1 point according to periodic trends, which metal has…
- canned soup is usually high in: fat carbohydrates sugar sodium question…
- a) \\(\\text{cr}_2\\text{o}_7^{-2} + \\text{cl}_2 \ ightarrow \\text{cl…
- 7. give the oxidation number for each element in the following: a) \\(\…
- name: date: 11. matter is anything that has mass and occupies what? a) …
- \\\\text{ba(oh)}_2 + 2\\text{hbr} \ ightarrow \\text{babr}_2 + 2\\text{…
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a 58.0 g sample of unknown composition was carefully analyzed and found…
$\text{C}_6\text{H}_9\text{O}\text{N}_5$
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a chemical compound composed of nitrogen and oxygen was carefully analy…
$\text{N}_2\text{O}_3$
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need a closer look? view this ph scale on desmos.table 1 shows the amou…
3. D. The pH of a solution is lower after the titration because of the addition of an acid. 4. C. The pH changes in the opposite direction and the colors would be reversed.
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3. hypochlorous acid and hypochlorite when considered together are also…
3. c. free chlorine 4. b. Chlorine dioxide
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5. acetic acid has a melting point of 16.6°c and a boiling point of 117…
A labeled heating curve for acetic acid is structured as follows (description, which can be translated to a graph): - **X-axis**: Heat Added (increasing left to right) - **Y-axis*…
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9. if a material has a high electron affinity, what will occur when it …
The object with higher electron affinity will gain an electron and end up negatively charged, while the object with a lower electron affinity will loose an electron and end up pos…
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4. describe the movement of the particles at the boiling point of a sub…
When a substance is at its boiling point: 1. **Temperature**: The temperature of the substance remains constant, even as more thermal energy is added. 2. **Energy**: The added the…
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sealing of cuts in skin by blood clotting:when the skin is cut, blood v…
The blood clotting cascade proceeds as follows: 1. Vessel/skin damage activates platelets and releases tissue factor (TF), which binds to factor VII to form TF:VIIa. 2. TF:VIIa ac…
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date 2/11/26 student #____you must create a bohr model for each atom, i…
| | protons | neutrons | electrons | |---|---|---|---| | 6. $^{22}_{11}\text{Na}$ | 11 | 11 | 11 | | 7. Fluoride ion, $\text{F}^-$ | 9 | 10 | 10 | | 8. Magnesium ion, $\text{Mg}^{…
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chemical reactions task cards created by teamwork toolbox (2017)chemica…
$\text{B}_2\text{Br}_6 + 6\text{HNO}_3 ightarrow 2\text{B(NO}_3\text{)}_3 + 6\text{HBr}$ ---
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which of these statements about airplane and rocket flight is true? a. …
B. Only one requires air molecules to generate lift.
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a rocket uses an engine that creates thrust through the combustion of a…
A. Chemical rocket
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3/15 what is the result of the reaction between potassium bromide and a…
B. no precipitate is formed
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2/15 which of the following compounds is soluble? strontium carbonate p…
potassium carbonate
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which term below describes the study of how energy is transferred to di…
A. Thermodynamics
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which change does nitrogen undergo oxidation? a. $ce{no_{2} -> n_{2}o_{…
D. $\text{NH}_3 ightarrow \text{N}_2$
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multiple-choice question how do you determine the number of neutrons? p…
Mass # - Atomic number
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1. which type of reaction? $ce{mg + 2hcl -> h_{2} + mgcl_{2}}$synthesis…
1. Single Replacement 2. A: Reactants; B: Yield Sign; C: Product 3. Ca: 3 atoms, C: 12 atoms, H: 18 atoms, O: 12 atoms 4. $4\text{P} + 5\text{O}_2 ightarrow 2\text{P}_2\text{O}_5$…
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multiple-choice question what happens if you heat up a liquid? it becom…
A. It becomes a gas.
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6 protons if carbon is neutral, then how many electrons should it have?…
6
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energy level # of electrons 1 2 2 8 3 18 what is the maximum number of …
8
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multiple-choice question which element is in the second period of the p…
D. Carbon
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which of these elements is not present in $\text{nano}_3$? nitrogen sod…
hydrogen
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1/10 how many total elements are in the chemical formula $ce{fe_{2}(no)…
3
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find the element: protons: 8 neutrons: 9 electrons: 8
Oxygen (O)
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what needs to be added for a solid to turn into a liquid and then gas? …
energy
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6/10 how many total atoms are in the chemical formula $\text{c}_3(\text…
9
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how many atoms of hydrogen are in this compound? 2 4 3 1
A. 2
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1/10 how many atoms are there total in $ce{h_{2}so_{4}}$? 5 3 7 6
7 (corresponding to the orange option with the number 7)
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what is it called when a liquid turns into a solid? vaporization freezi…
freezing
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2/10 how many oxygen atoms are in $ce{al_{2}(so_{4})_{3}}$? 1. 12 2. 7 …
1. 12
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multiple-choice question what is it called when a gas changes into a li…
condensation
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1. list the factors that affect chlorination of drinking water? 2. desc…
1. The factors affecting drinking water chlorination are: pH level, water temperature, chlorine dosage, contact time, presence of organic matter, water turbidity, and presence of …
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multiple-choice question what is it called when a liquid changes into a…
vaporization
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7. drew added yeast and sugar to room temperature water and placed it i…
B. The mass of the flask/balloon after the reaction should be the same as before the reaction since matter is neither created nor destroyed.
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multiple-choice question what is it called when a solid changes to a li…
melting
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6. students are given a sample of an unknown material. they want to per…
burning it producing a change in thermal energy
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5. a chemical formula is shown below: $(nh_4)_3po_4$ how many atoms, in…
20
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what are the charges of the following transition metals?iron (ii) _____…
### Ion Charges: Iron (II): $+2$ Tin (IV): $+4$ Cobalt (II): $+2$ Palladium (I): $+1$ Lead (II): $+2$ Copper (I): $+1$ Vanadium (IV): $+4$ Platinum (II): $+2$ Manganese (III): $+3…
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use your periodic table to predict the charges of the following ions: b…
$\text{Be}^{2+}$, $\text{I}^-$, $\text{Ar}$, $\text{Na}^+$, $\text{Cl}^-$, $\text{Ca}^{2+}$ $\text{O}^{2-}$, $\text{K}^+$, $\text{F}^-$, $\text{S}^{2-}$, $\text{P}^{3-}$, $\text{M…
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study the chemical equation. na + cl₂ → nacl is the chemical equation p…
No. There are two chlorine atoms on the reactant side and only one chlorine atom on the product side.
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4. the chemical formula for methane is $\text{ch}_4$. which statement d…
Four molecules of methane would contain 4 atoms of carbon and 16 atoms of hydrogen.
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9. which of the following groups contains members with similar chemical…
C. Cu, Ag, Au B. C, N, O donate 2 electrons gain 2 electrons donate 1 electron does not gain or lose donate 1 electron gain 1 electron donate 1 electron gain 1 electron does not g…
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1. the best friends club uses \invisible ink\ to write notes to each ot…
chemical change
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9. which of the following groups contains members with similar chemical…
9. C. Cu, Ag, Au 10. B. C, N, O
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3. based on the balanced chemical equation below, how many grams of $hg…
48 g
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answer the following questions over the relatedness of elements in the …
1. B silicon 2. C strontium 3. H helium 4. B lithium 5. D iodine 6. C helium 7. B phosphorous 8. D tin
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a spill occurs in the lab. the teacher asks whether it was a compound o…
It is a mixture because compounds do not separate on their own.
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romeo and juliet act 1 scene 5 sonnet analysisname: aynadavostep 1: ass…
### 1. Yellow (Religious Imagery) - Underline these phrases: - holy shrine - gentle sin - blushing pilgrims - Good pilgrim - mannerly devotion - saints - pilgrims' hands - holy pa…
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why are there 2 fluorine atoms in this bond? click all that apply. 3 an…
- Calcium has 2 valence electrons to "give away." - One Fluorine atom only needs 1 electron. - Calcium and Fluorine both need a full outer shell in order to become stable.
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the ancient egyptians are famous for their mummies. they had an elabora…
1. moss 2. bacteria 3. oxygen
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○ ionic bond and monolithium fluoride ○ covalent bond and lithium monof…
O ionic bond and Monolithium fluoride
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the ancient egyptians are famous for their mummies. they had an elabora…
1. Drag **moss** to the first blank: *Bogs are swampy areas full of dead moss called peat.* 2. Drag **animals** to the second blank: *Peat stops animals from growing.* 3. Drag **b…
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use criss-cross method to write the formula for each of the following. …
5. $\text{K}_3\text{N}$ 6. $\text{CaI}_2$ 7. $\text{Sr}_3\text{P}_2$ 8. $\text{Al}_2\text{Se}_3$ 9. Magnesium nitride 10. Strontium fluoride 11. Lithium phosphide 12. Cesium nitri…
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* indicates required question question 2 what is the name and the type …
Magnesium transfers electrons to chlorine; magnesium chloride is the name