Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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kyle chem inc., a multinational company, manages all its value chain pr…
b. vertical integration
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sensory receptors of the eye the special sensory receptors of the eye a…
photoreceptors
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sense mechanical change in surrounding tissues including touch, pressur…
Sense mechanical change in surrounding tissues including touch, pressure, itching, and stretching - Mechanoreceptors. Sense light - Photoreceptors. Sense chemicals and chemical co…
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3) modify the schematic below to change the polarity of the out voltage…
To change the polarity of the output voltage, reverse the direction of the diode (or the diodes, if multiple) in the circuit. For the given schematic (Figure 2, which appears to b…
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3) modify the schematic below to change the polarity of the out voltage…
To change the polarity of the output voltage in the rectifier circuit (Figure 2), reverse the direction of the rectifier diode (the standard diode, not the Zener diode). This will…
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a nurse is caring for a client who was prescribed an antidepressant bas…
A. Pharmacologic action
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when reviewing a list of medications in a medication handbook, a nurse …
B. It is listed in parentheses along with the trade name.
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a nurse is caring for a client who was prescribed an antidepressant bas…
A. Pharmacologic action
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atoms, molecular elements, molecular compounds, and ionic compounds 1 o…
To solve the classification of chemical species (atoms, molecular elements, molecular compounds, ionic compounds), we analyze each: ### Single Atoms (Atomic Elements) - **Mn**, **…
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fill in the blanks to complete each sentence with the appropriate word.…
1. The fossil fuels industry, which $\boldsymbol{uses}$ methods that some consider environmentally objectionable, has come under fire for a method called "fracking." 2. Fracking i…
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the ratio of h₂ gas to o₂ gas will always remain 2:1, and the ratio of …
44.8 liters of \(H_2+22.4\) liters of \(O_2 ightarrow44.8\) liters of \(H_2O\)
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now molecules: molecules of h₂ + molecules of o₂ → molecules of h₂o
2 molecules of \(H_{2}\)+1 molecule of \(O_{2}\to2\) molecules of \(H_{2}O\)
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any units will do. for example, lets use the unit of \dozens\: 2 dozen …
1, 2
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mass box a = 10 grams; mass box b = 5 grams; mass box c—made of one a a…
15 grams
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each box contains 10 items. mass box a = 10 grams; mass box b = 5 grams…
\(2\)
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which of the following pieces of legislation is credited with dramatica…
3) Clean Water Act
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write formulas for the compounds formed from sr and each of the followi…
\( \text{Sr(NO}_2\text{)}_2, \text{SrCO}_3, \text{Sr}_3(\text{PO}_4)_2 \)
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write formulas for the compounds formed from rb and each of the followi…
\(RbNO_2\), \(Rb_2CO_3\), \(Rb_3PO_4\)
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enter the formula for the compound that forms from calcium and hydrogen…
\(CaHPO_4\)
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enter the formula for the compound that forms from calcium and phosphat…
\(Ca_{3}(PO_{4})_{2}\)
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read this excerpt from a passage. in 2008, the once thriving company to…
The author uses subjective language.
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enter the formula for the compound that forms from calcium and carbonat…
\( CaCO_3 \)
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question 20 (1 point) a solution has the 23.22% mass/volume of a partic…
C. 580.5 g
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question 19 (1 point) which of the following is a solution? oil in wate…
Steel
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question 18 (1 point) a(n)_____ is any substance that increases the rat…
catalyst
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question 15 (1 point) which of the following amino acids has the highes…
Arginine
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question 14 (1 point) the particular ph at which a given amino acid exi…
isoelectric point
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read the following sentence with misplaced modifiers: my favorite toys …
Growing up, my favorite toys were Legos and a chemistry set; to me, the most fun of all was using the chemicals to melt the plastic bricks.
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question 12 (1 point) a(n)______ is a molecule that contains an amino g…
amino acid
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question 11 (1 point) a buffered solution ________. ○ fails to keep hyd…
maintains a constant or nearly constant pH when small amounts of strong acids or bases are added.
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question 10 (1 point) what is the hydronium ion concentration of a solu…
C. \(5.01\times 10^{-10}\text{ M}\)
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a solution of a compound in water conducts electricity, turns litmus re…
\(C_3H_5(COOH)_3\)
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what is the formula for the conjugate acid of dihydrogen phosphate, $h_…
B. \(H_3PO_4\)
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question 7 (1 point) what is the ph of a solution with a poh of 6.2? 6.…
\(pH = 7.8\), so the correct option is \(7.8\).
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question 6 (1 point) in the equation ( c_1v_1 = c_2v_2 ), what does c r…
Concentration
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question 5 (1 point) the ph scale is based on the concentration of the …
hydronium
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question 4 (1 point) the basic difference between a strong acid and a w…
is 100% ionized in aqueous solution
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read the following paragraph from an essay discussing a ban on outdoor …
Main point
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according to the brønsted-lowry definitions of acids and bases, which o…
$\ce{H2O}$
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question 2 (1 point) saved the h₃o⁺ ion is called the ______ ion. perox…
B. hydronium
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a brønsted-lowry base is a compound that: accepts a hydrogen ion. suppl…
accepts a hydrogen ion.
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name the compound hc₂h₃o₂(aq). acetous acid acetic acid hydroacetic aci…
acetic acid
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name the compound albr₃. aluminum(iii) bromide aluminum tribromide alum…
aluminum bromide
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what is the difference between a common name for a compound and a syste…
The systematic name provides the reader with enough information that the formula of the compound can be determined. The common name is just like a nickname for the compound.
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part a write a formula for the compound that forms between ca and cl. c…
\(CaCl_{2}\) (the third option)
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current attempt in progress what is the difference between electron pai…
The electron - pair arrangement is the arrangement of both bonding and nonbonding electrons in a Lewis structure. The molecular shape of a molecule is the three - dimensional arra…
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write formulas for the compounds formed from in and each of the followi…
\(In(ClO_4)_3,In_2(SO_4)_3,InPO_4\)
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current attempt in progress if a molecule has more than one correct lew…
Resonance
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write formulas for the compounds formed from sr and each of the followi…
\(Sr(ClO_4)_2,SrSO_4,Sr_3(PO_4)_2\)
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current attempt in progress in a polar covalent bond, how do you determ…
negative; positive
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write formulas for the compounds formed from rb and each of the followi…
\(RbClO_4,Rb_2SO_4,Rb_3PO_4\)
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current attempt in progress explain in simple terms how a chemist descr…
A covalent bond is formed by the overlap of the **atomic orbitals** on individual atoms. There is a sharing of **electrons** in the region where the **orbitals** overlap.
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enter the formula for the compound that forms from calcium and hydrogen…
\(CaHPO_{4}\)
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current attempt in progress how may shared electrons make up a single c…
1. 2 2. 3
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question 41 of 55 policies current attempt in progress what is the over…
The overall charge on an ionic compound is zero.
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element y reacts with oxygen to form the compound y₂o and has the lowes…
Potassium (\(K\))
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part b enter the formula for the compound that forms from calcium and c…
\(CaCO_{3}\)
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part a enter the formula for the compound that forms from calcium and h…
\(Ca(OH)_2\)
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part d calcium and iodine express your answer as a chemical formula. a …
\(CaI_{2}\)
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calcium and sulfur express your answer as a chemical formula.
\(CaS\)
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beryllium and iodine express your answer as a chemical formula. a chemi…
\(BeI_{2}\)
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what polyatomic ions have a 3 - charge? check all that apply. hydroxide…
phosphate
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what polyatomic ions have a 2 - charge? check all that apply. phosphate…
carbonate, sulfite, chromate
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what is the formula of the ionic compound that forms from gallium and c…
\(GaCl_3\)
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part a which element is a molecular element? lithium iodine krypton cop…
iodine
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part a which elements have molecules as their basic units? check all th…
C. bromine, D. oxygen
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what is the difference between an ionic compound and a molecular compou…
Second option: In ionic compounds the atoms (or group of atoms) exist as ions and are held together by electrostatic forces. In molecular compounds the atoms are held together by …
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which of the following is an example of an ionic compound? view availab…
sodium chloride
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cdcl₂ ca(oh)₂ cobalt k₂cro₄ oxygen cocl₂ h₂ ni helium chlorine so₂ c₂h₆…
- Single atoms: Cobalt, Ni, Helium - Diatomic molecules: Oxygen, Chlorine - Molecules: \(H_2\), \(SO_2\), \(C_2H_6\) - Formula units: \(CdCl_2\), \(Ca(OH)_2\), \(K_2CrO_4\)
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cdcl₂ ca(oh)₂ cobalt k₂cro₄ oxygen cocl₂ h₂ ni helium chlorine so₂ c₂h₆…
- Single atoms: Cobalt, Ni, Helium - Diatomic molecules: Oxygen, Chlorine - Molecules: \(H_2\), \(SO_2\), \(C_2H_6\) - Formula units: \(CdCl_2\), \(Ca(OH)_2\), \(K_2CrO_4\)
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no₂ cu nacl hi mgcl₂ hg cl₂ n₂ atomic elements molecular elements molec…
- Atomic elements: \(Cu\), \(Hg\) - Molecular elements: \(Cl_{2}\), \(N_{2}\) - Molecular compounds: \(NO_{2}\), \(HI\) - Ionic compounds: \(NaCl\), \(MgCl_{2}\)
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37. for each molecular geometry, give the number of total electron grou…
### Part (a) #### Explanation: - **Step 1: Identify molecular geometry** The shape is tetrahedral (4 bonding groups, 0 lone pairs on central atom). - **Step 2: Total electron grou…
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2. entiendo de dónde vino la energía para lanzar el modelo de nave espa…
The energy to launch a spacecraft (or its model) mainly comes from the chemical energy stored in rocket fuel. During launch, chemical energy in the fuel is converted to thermal en…
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which of the following describes both gelisols and alfisols? i. typical…
II only
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question 1 (multiple choice worth 3 points) (04.06r lc) which of the fo…
D. Forbid clear - cutting on steep hills
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current attempt in progress your answer is incorrect. two electrons occ…
spin of the electron.
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in denver, colorado the elevation is about 5,280 feet above sea level. …
The solubility of a gaseous solute in a liquid solution will decrease in Denver (high elevation) because atmospheric pressure is lower there. By Henry's Law ($C = kP$), lower part…
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current attempt in progress write the symbols of the first three elemen…
element 1: O element 2: S element 3: Se
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current attempt in progress of the elements, ir, pb, xe, zr, and ag, wh…
Ir, Ag, Zr
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solutions contain more solute than could be dissolved under normal cond…
B. Supersaturated
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to dilute a stock solution, the solution and additional solvent are com…
True
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a 60% alcohol solution is composed of ______ ml of alcohol and ______ m…
C. 60; 40 (assuming the options are labeled as A:40;100, B:40;60, C:60;40, D:60;100)
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an increase in ______ will increase the solubility of a gas in water. ○…
B. pressure
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current attempt in progress how many s electrons, p electrons, and d el…
\(s\) orbital: \(2\) electrons per shell; \(p\) orbital: \(6\) electrons per shell after the \(1^{st}\) energy level; \(d\) orbital: \(10\) electrons per shell after the \(2^{nd}\…
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a______solution contains the maximum amount of dissolved solute under s…
B. saturated
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a homogeneous mixture of two or more substances is called a(n) ________…
D. solution (assuming the options are labeled A to D with D being solution; if the original options had labels like the last option as solution, the correct one is the option with…
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an increase in temperature ______ the solubility of a solid solute diss…
B. increases
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the solubility of salt is 35.7 g per 100 g of water at 25.0°c. to find …
C. mass percent
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bronze is a solid solution consisting of 90% copper and 10% tin. tin is…
True
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the solvent in a solution is the component that ______. dissolves the s…
A. dissolves the solute
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(b) 1s and 2s orbitals are different in the following ways: symmetry ar…
distance of electrons from the nucleus, size of the orbital
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(a) 1s and 2s orbitals are similar in the following ways: symmetry arou…
symmetry around the nucleus, holds a maximum of 2 electrons, orbital shape.
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current attempt in progress how many electrons occur in the valence lev…
Elements in Group 3A contain \(3\) valence electrons. Elements in Group 3B contain \(2\) valence electrons and \(1\) electron in an inner \(d\) orbital. Group A elements are repre…
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complete the rhyme scheme. the sun was shining on the sea shining with …
a b c b d b
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what happens when a solid is dissolved into a liquid? solid particles f…
C. Solid particles become evenly dispersed among liquid particles.
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the particles in water have less mobility than the particles in oxygen.…
D. Water particles have strong intermolecular forces
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complete the rhyme scheme. a b b c c sometimes the mist overhangs my pa…
A, B, C, C, B
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liquids and solids are referred to as \condensed phases\ because the at…
the option with "leave little space between the molecules" (the second option from the top, with the text "leave little space between the molecules")
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carla makes a small cardboard boat and floats it in a tub of water. whe…
The soap reduced the surface tension behind the boat, causing both water molecules and the boat to be pulled forward. (Assuming the second option is labeled as, e.g., B. The soap …
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a chemist carefully measures the amount of heat needed to raise the tem…
\boxed{137} (or more accurately, if we consider the calculation more precisely, maybe 1.37×10², but 137 is three sig figs. Wait, let's check the exact calculation: 5.41 / ( (0.306…