Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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select the correct answer. which is the correct definition of toxicolog…
C. the study of the adverse effects of some chemicals on organisms
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select the two ways that marbling affects meat: * creates better flavor…
- Creates better flavor - Increases tenderness ### Second Question (This type of fat can be seen with the eyes)
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2nan₃(s) → 2na(s) + 3n₂(g) 6na(s) + fe₂o₃(s) → 3na₂o(s) + 2fe 5. assume…
92.3 g
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select the two ways that marinating affects meat. * creates better flav…
- Creates better flavor - Increases tenderness ### Second Question (The type of fat can be seen with the eyes)
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5.0 moles of gas take up 15.0 l of space under a set of constant pressu…
6.0 L
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a flexible container originally has a volume of 17 l and holds 0.75 mol…
28.33 L (or $\frac{85}{3}$ L)
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a flexible container holding 2.50 moles of a gas expands from 40.0 l to…
3.25
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3.25 moles of gas take up 40.0 l of space under constant pressure and t…
15.4 L
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a flexible container holding 1.25 moles of a gas contracts from 25.0 l …
0.500 mol
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moles of air 1.0 mole of h₂ gas fills a flexible container. hydrogen is…
The volume increases to three times the original amount.
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according to the graph, what relationship does volume and moles of gas …
directly related
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4. one step in making para - aminobenzoic acid, paba, an ingredient in …
37.2%
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which graph correctly depicts the relationship between number of moles …
The first graph (straight line with positive slope) correctly depicts the relationship.
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which of the following equations represents avogadros law of molar volu…
$\frac{n_1}{V_1} = \frac{n_2}{V_2}$
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4. basic ionic naming and formulas - in an ionic compound, the charges …
### Question 4 (Basic Ionic Naming and Formulas) #### Part 1: Fill in the Blanks - In an ionic compound, the charges must sum to $\boldsymbol{0}$ (neutral). - In an ionic compound…
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talking into a battery operated microphone has what kind of energy tran…
1. Chemical to Sound 2. Electrical to Radiant
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what do we call a change from one form of energy to another? * energy c…
Energy Transformation
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what form of energy is stored in matches or food?*chemicalsoundthermaln…
1. chemical 2. work 3. Thermal
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what form of energy is a moving car?*radiantmechanicalsoundelectricalhe…
1. Mechanical 2. Thermal Energy 3. Light and Heat
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nitrogen gas at 298 k and 75.5 kpa increases in pressure to 175 kpa. wh…
691 K
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a gas at 600 torr and 300 k is heated to a final pressure of 1000 torr.…
500
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a sample of gas at 32.6 torr and 735 k is heated to 1035 k. what is the…
45.9 torr
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a gas in a sealed container at 86.0 °c decreases in temperature to 30.0…
2.13
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when a gas at 325 k and 767.0 mm hg changes in pressure to 810.0 mm hg,…
343 K
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a gas at 49.3 °c and 893 mm hg experiences a temperature change and end…
8.0 °C
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the pressure that a gas exerts on a sealed container changes from 3.74 …
7.49 atm
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which graph correctly depicts the relationship between pressure and tem…
The third graph (a straight line with positive slope starting from the origin, plotting Pressure (atm) vs. Temperature (K))
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what temperature units should be used when performing calculations usin…
K only
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which of the following equations represents gay - lussacs law? $p_{1}p_…
$\frac{P_1}{T_1} = \frac{P_2}{T_2}$
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which ion in each pair has the smaller atomic radius? 9. k+ or o2- 10. …
\( K^+ \) ### 10. \( \boldsymbol{Ba^{2+}} \) or \( \boldsymbol{I^-} \)
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the volume of a container expands when it is heated from 159 k to 456 k…
5.38 L
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a gas with an unknown volume is originally 588 k. when the volume of th…
689 mL
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the volume of a gas is changed from 3.6 l to 15.5 l. what is the initia…
-188.5 (rounded to one decimal place)
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when the volume of a gas is changed from 250 ml to 425 ml, the temperat…
424 °C
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when the volume of a gas is changed from 250 ml to 425 ml, the temperat…
410 K (or 410.15 K)
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which graph correctly depicts the relationship between volume and tempe…
The first graph (Volume vs. Temperature with a positive linear slope)
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what is the volume when 524 cm3 of a gas at 491 k is cooled to 297 k? v…
317 cm³
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what is the volume when 524 cm3 of a gas at 491 k is cooled to 297 k? l…
524 cm³
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what temperature units should be used when performing calculations usin…
K only
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which of the following equations represents charles law? v1v2 = t1t2 v1…
$\frac{V_1}{T_1} = \frac{V_2}{T_2}$
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shown below is a chemical reaction from organic chemistry and the react…
ΔG‡ = 120 kJ/mol (the option with ΔG‡ = 120 kJ/mol)
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problems: 1. a student performed an experiment investigating precipitat…
Identify Solution Q: K₂CO₃ Chemical Formulas for the 2 Precipitates: Ag₂CO₃ and BaCO₃
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which of the following statements about secondhand smoke is not true? a…
C. Secondhand smoke is inhaled less deeply than firsthand smoke.
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which two correctly describe processes of the water cycle occurring in …
B. Water molecules are condensing on the lid and forming liquid precipitation. C. Water is heated in the kettle, turning it from a liquid to a gas through evaporation.
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the word \alchemy\ is the basis for the name of which modern branch of …
Chemistry (the option with "Chemistry" text, so the checkbox next to Chemistry should be selected, and the answer is the option: Chemistry)
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25. mg^{+2} & s^{-2} name:________________________ 26. mg^{+2} & n^{-3}…
Magnesium sulfide ### Question 26: $Mg^{+2}$ & $N^{-3}$
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9. how many grams of c₂h₂ are produced by adding 5.00 g cac₂?
\(2.03\space g\)
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8. how many moles of c₂h₂ are produced by adding 5 moles of cac₂?
\(5\space mol\)
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b) in an experiment dry chlorine gas was reacted with aluminum as shown…
i) Aluminium chloride ii) \(2Al + 3Cl_{2}\xlongequal{\Delta}2AlCl_{3}\) iii) \(1.12dm^{3}\) iv) - To dry the chlorine gas (remove moisture). - To absorb any un - reacted chlorine …
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question 1 suppose that 1.25 g of ba(hc8h4o4)2 (barium hydrogen phthala…
The molarity of the \( \text{NaOH} \) solution is approximately \( \boldsymbol{0.356 \, \text{M}} \) (or more precisely, let's do the calculation again: 1.25 g / 467.55 g/mol = 0.…
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4. when might you use the apa style manual? for a newspaper or magazine…
for a history research paper
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what happens when a fuel such as coal is heated to a high temperature i…
B. Energy is released as heat which can then be used.
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a chemical reaction where a substance interacts with to release heat is…
oxygen
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identify the combustible substance from the following options that reac…
d. wood
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when iron rusts, it slowly combines with oxygen to form iron oxide. is …
No
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if you cover a burning candle with an inverted cup, the flame dies out …
A. oxygen
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which of the following is the correct chemical equation for the combust…
B. \(CH_4 + 2O_2 ightarrow CO_2 + 2H_2O\)
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what are the products of any combustion reaction involving a hydrocarbo…
A. Carbon dioxide, D. Water
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a combustion reaction is a reaction in which a substance reacts with to…
Oxygen, heat
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which of the following is not a combustion reaction? a li(s) + o₂(g) → …
d. \(NO(g)+O_3(g)\to NO_2(g) + O_2(g)\)
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what are the primary products of the combustion of a hydrocarbon? a car…
A. carbon dioxide and water
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the chemical reaction in which copper oxide and sulfuric acid are mixed…
e. double - replacement
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which of the following diagrams represents a double - replacement react…
c
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at least one of the products of a double - replacement reaction is a a …
D. any of the above
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what type of substance typically participates in double - replacement r…
D. ionic compounds in aqueous solution
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na₂co₃ + 2hcl → 2nacl + h₂o + co₂ the reaction above is classified as a…
E. double - replacement
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can you identify the double displacement reactions from the following l…
B. (ii) only
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what is a precipitate? a gaseous molecular compound b metallic solid c …
C. insoluble ionic compound
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which of the following is not a double - replacement reaction? a hi + b…
C. \(Zn + Cu(CH_{3}COO)_{2} ightarrow Zn(CH_{3}COO)_{2}+Cu\)
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kbr + agno3 -- kno3 + agbr zn + 2hcl -- h2 + zncl2 mgco3 -- mgo + co2 2…
\(3\)
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the chemical reaction in which ammonium sulfate and potassium hydroxide…
A. double - replacement
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identify the type of reaction occurring based on the description below:…
A. Double - replacement
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identify the type of reaction occurring based on the description below:…
A. Double - replacement
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what is the missing coefficient to make a balanced equation? be sure th…
1
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write the chemical equations for reach equation described below. includ…
1. $\text{CH}_4(g) + 2\text{O}_2(g) ightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(g)$ 2. $2\text{C}_2\text{H}_6(g) + 7\text{O}_2(g) ightarrow 4\text{CO}_2(g) + 6\text{H}_2\text{O…
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which liquid will produce the most drops on a penny. water or soapy wat…
El agua produce más gotas en promedio que el agua jabonosa.
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what is a hydroelectric power plant? a turbine that is place in a river…
A dam that is built across a river, making a body of water that can be used to create energy.
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what is a hydroelectric power plant? a turbine that is place in a river…
A dam that is built across a river, making a body of water that can be used to create energy.
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what is distillation? the separation of substances by centrifuge the co…
the separation of substances by boiling point
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based on the following balanced equation: 3li + alcl₃ → 3licl + al how …
\(3\)
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based on the following balanced equation: 4al + 3o₂ → 2al₂o₃ what is th…
\(4\text{Al}:2\text{Al}_2\text{O}_3\)
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use the following balanced equation to answer the questions: 4k + o₂ → …
\(156.4\space g\)
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use the following balanced equation to answer the questions: 4k + o₂ → …
\(4\) moles
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use the following balanced equation to answer the questions: 4k + o₂ → …
\(4\)
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how many formula units are in 8.0 moles of albr3? ? × 10^? formula unit…
Coefficient: \(4.8\) (rounded from \(4.816\)), Exponent: \(24\)
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what is the mass of 5.7 mol of nh3? molar mass nh3 = 17.04 g/mol 5.7 mo…
\(97\space g\)
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what is the missing coefficient to make a balanced equation? p4 + ? o2 …
\(3\)
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how much caf₂ would form if 4.0 grams of ca reacts with 3.8 grams of f₂?
$7.8\ \text{g}$
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what component of a chemical reaction is highlighted in red? sno₂(s) + …
subscripts
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what does fizzing from dropping hydrochloric acid onto a piece of limes…
The reaction produces a gas.
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you test 3 liquids for their surface tension by adding drops onto a pen…
Liquid 1
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based on the experiment, which of the following is the best description…
mostly dull or with very little luster
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what is the molar mass of the covalent compound h₂s? h₂s = ? g/mol
\(34.09\frac{g}{mol}\)
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what is the formula for dichlorine heptoxide?
$\text{Cl}_2\text{O}_7$ (the option $\text{Cl}_2\text{O}_7$)
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what is the name of the compound nf3? nitrogen trifluoride nitrogen flu…
nitrogen trifluoride
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which of the following properties is typically associated with lithium,…
malleable
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what is the molar mass of the ionic compound mg3n2? mg3n2 = ? g/mol
\(100.95\frac{g}{mol}\)
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a solid melts at 840 °c and conducts electricity when liquid. which of …
high melting point
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what is the name for the ionic compound caf₂? calcium fluorine cesium f…
calcium fluoride
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ionic compound formulas compound made from sodium and iodine. is in gro…
\(NaI\) (the second option in the multiple - choice list)