Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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incorrect answer, you get one more chance 12/46 a lewis structure shows…
B. the bonding between atoms in a molecule
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equal amounts of methylene blue (319.85 g/mol) and potassium permangana…
Potassium permanganate had a lower molecular weight, so it was able to diffuse more rapidly spreading farther through the agar in the same time.
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which will exist as individual molecules? select all correct options na…
B. F₂, C. CO₂
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when temperature increases, the random movement of molecules increases …
substance #5 in a gas at 78°F
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reasons that diffusion of a chemical is fastest in air than water. diff…
- the chemical would have to collide with and push through fewer molecules as it spreads out. - air molecules travel faster than water molecules. - air is less dense than water.
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to draw a lewis dot model you have to know. select all correct options.…
B. the number of valence electrons an atom has, C. the group an element is in
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11/46 the energy it takes to break a covalent bond is called electroneg…
B. bond energy
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which has a higher lattic energy? mgo mgcl₂
MgO
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6) choose the best answer. ____ is an inorganic nutrient that the body …
D. A mineral
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which has the strongest attraction for electrons? h c br cl
Cl
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vsepr helps predict the _____ of a covalent molecule.
shape
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which best describes the electrons in a metal? select all correct optio…
A. free - roaming, B. delocalised, C. they don't belong to any particular metal atom, D. "sea of electrons"
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using the supplied solubility curve, determine the temperature that ce2…
(The answer depends on the actual solubility - curve graph. Without seeing the exact graph, the specific temperature value cannot be provided. But the general method is as describ…
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using the supplied solubility curve, determine the temperature that ce2…
(The answer depends on the actual intersection point on the provided solubility - curve graph which is not visible in text - only format. You need to read the value from the graph…
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using the supplied solubility curve, determine the type of solution for…
We need the solubility - curve to accurately determine if the solution is unsaturated, saturated, or supersaturated. But if we assume the solubility of Ce₂(SO₄)₃ at 50°C is known:…
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using the supplied solubility curve diagram, determine which compound l…
Without the actual solubility - curve data, we can't give a specific compound. But the process is to follow the above steps to compare the solubility values of NaCl, KCl, KNO₃, an…
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using the supplied solubility curve diagram, determine what type of sol…
We need the actual solubility - curve diagram to determine the solubility of NH₃ in 100 grams of water at 30°C. If the solubility of NH₃ in 100 grams of water at 30°C is greater t…
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using the supplied solubility curve diagram, determine what type of sol…
We need the actual solubility - curve diagram to determine the solubility of NH₃ in 100 grams of water at 30°C. Then compare 50 grams with that value to decide if the solution is …
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question 18 of 20 > write the molecular and net ionic equations, includ…
molecular equation: \(NaCl(aq)+AgNO_{3}(aq)=AgCl(s)+NaNO_{3}(aq)\) net ionic equation: \(Cl^{-}(aq)+Ag^{+}(aq)=AgCl(s)\)
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3. match the words with the descriptions. tastes sour turns litmus pape…
- tastes sour: Acid - turns litmus paper blue: Base - can be dissolved in water: Base - feels slippery: Base - found in citric juices and other foods: Acid - tastes bitter: Base -…
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classify each reaction according to whether a precipitate forms. precip…
Precipitate forms: \(Fe(NO_3)_3 + Na_2S\), \(AgNO_3+NaOH\), \(Pb(NO_3)_2 + NaOH\), \(Mg(NO_3)_2+NaOH\), \(Fe(NO_3)_3 + NaOH\) Precipitate does not form: \(NaNO_3 + NaOH\), \(Mg(NO…
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4 why is a temperature change an indication that a chemical change has …
4. A temperature change can indicate a chemical change because chemical reactions involve energy - changes related to bond - breaking and forming. 5. A chemical reaction is the tr…
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describe what happens when ionic and covalent (molecular) substances di…
(a) Ionic compound dissolved in water, H₂O(l), will produce aqueous ions in solution. (b) Molecular (covalent) compound dissolved in water, H₂O(l), will produce aqueous covalent m…
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1 what is a physical change? give three examples 2 why is boiling a phy…
1. A physical change is a change in form or state without altering chemical composition. Examples: melting ice, breaking glass, cutting paper. 2. Boiling is a physical change as i…
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select the correct answer. a hockey player has the puck in the corner o…
D. single - replacement
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select the correct answer. what reaction is depicted by the given equat…
B. reduction
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select the correct answer. which statement describes the acid found in …
D. It reacts with Mg to produce $H_2$.
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select the correct answer. what is the name of h₃po₄? a. hydrophosphori…
E. phosphoric acid
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the atomic mass of calcium is 40.08. what is the mass of 6.02×10²³ atom…
C. 40.08 g
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select the correct answer. which is the next logical step in balancing …
B. Place the coefficient 3 in front of the chlorine molecule.
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select the correct answer. what is the key characteristic of an oxidati…
C. Electrons are exchanged.
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the atomic mass of nitrogen is 14.01, hydrogen is 1.01, sulfur is 32.07…
E. 132.17 g
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2. which fatty acid tail from the illustration is saturated? which is u…
The straight - tailed fatty acid is saturated. The kinked - tailed fatty acid is unsaturated.
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question 20 of 21 the table of solubility guidelines. the scientist sta…
precipitate from A + C: \(Ag_3AsO_4\) precipitate from A + D: \(AlAsO_4\) precipitate from B + C: \(Ag_2C_2O_4\) precipitate from B + D: \(Al_2(C_2O_4)_3\) precipitate from C + D:…
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11 shemar and grace were investigating a place you could see both chemi…
The physical change (melting of wax) is visible near the base of the flame where the solid wax turns into liquid. The chemical change (burning of wax vapors) is visible in the fla…
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physical and chemical changes - 7.6c 10 meals ready - to - eat (mres) a…
2
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part a thomas and rio dropped a solid tablet into a beaker of water and…
B. Thomas
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physical and chemical changes - 7.6c 7 the diagram provided shows ways …
Left - hand side (Physical Change branch): - substance can be changed by: bending, cutting Right - hand side (Chemical Change branch): - evidence new substance was formed: gas pro…
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question 12 of 12 > a 47.0 ml aliquot of a 0.600 m stock solution must …
$235\ mL$
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what nacl concentration results when 294 ml of a 0.780 m nacl solution …
$0.515$
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question 11 of 12 what nacl concentration results when 294 ml of a 0.78…
$0.515$
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physical and chemical changes - 7.6c 6. payal went with her aunt to wat…
- B. Temperature change - D. Light production - E. Color change
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physical and chemical changes - 7.6c 4 an experiment was performed in w…
A. observation 1
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3 the data table provided contains information about how temperature af…
B. temperature physically changes matter.
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one brand of vinegar has a ph of 4.5. another brand has a ph of 5.0. th…
$2.2\times10^{-5}$
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physical and chemical changes - 7.6c 2 carlos added vinegar to a flask …
A. Vinegar and baking soda mixing together
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1 makena measured the mass of a closed beaker containing several ice cu…
C. Physical change, 125 g
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4. rheumatoid arthritis is an autoimmune ill - ness. with an autoimmune…
4. B. Immune 5. A. It feels heat, cold pain, touch, and pressure. 6. C. The NA should assist the resident with brushing and flossing regularly
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the equation for the ph of a substance is ph = -logh+, where h+ is the …
C. 8.7
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4. a glucose molecule has a molecular formula of c₆h₁₂o₆. when two gluc…
When two glucose molecules combine to form maltose, a condensation reaction takes place with the elimination of a water molecule ($H_2O$), reducing the number of hydrogen and oxyg…
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the equation for the ph of a substance is ph = -logh+, where h+ is the …
$4.0\times10^{-3}$
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the term ____________ means loss of electrons, and the term ___________…
A. oxidation, reduction
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question 2 catalysts speed up chemical reactions and are consumed in th…
B. False
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4. a 40.0 l tank of ammonia has a pressure of 12.7 kpa. calculate the v…
$60.5\ L$
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hydrogen sulfide is the chemical responsible for otten eggs\, and is th…
bent molecular geometry and it has a molecular dipole moment
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boron trifluoride is used in the electronics industry in processes that…
trigonal planar and nonpolar
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ethanol is the alcohol in alcoholic beverages, its lewis structure is s…
has a molecular dipole moment and it is polar
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ammonia is critical to the production of fertilizers. it has been estim…
it is trigonal pyramidal and it is polar
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trichlorosilane is extremely important in the electronics industry, it …
polar
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toluene is yet another important industrial solvent, classify it as pol…
nonpolar
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acetone is another important industrial solvent, classify it as polar o…
polar
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carbon tetrachloride is an important industrial solvent, classify it as…
nonpolar
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multiple choice 1 point is water a polar or a nonpolar molecule? this i…
polar molecule
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the densities of liquids can also be understood at the atomic and molec…
Octane molecules will pack together better
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shown below is a periodic table highlighting the elements copper and zi…
The atomic separation will be smaller for copper.
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vanadium (v) and copper (cu) are metals commonly used in engineering an…
Copper will be 1.25 times more dense
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titanium is used in specialized engineering applications because it is …
1.17
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density is a fundamentally important property of metals used in enginee…
(lowest density) Mg < Ti < Fe (highest density)
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the element silicon (si) is essential to the electronics industry. it i…
They would all weigh the same
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copper is used in many engineering applications, particularly in electr…
0.141 moles
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during an adiabatic process in a closed system, what happens to a gas w…
Its temperature decreases.
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the diagram shows a sealed container, which represents a closed system.…
The kinetic energy of the molecules would increase.
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question 5 the equilibrium equation can be solved without using the qua…
Question 5: The equilibrium equation can be solved without using the quadratic formula if the $K_c$ is less than 1 and the change in the concentration is less than 10% of the init…
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question 3 which one of the following sets of information is not suffic…
Question 3: The initial concentration of all the reactants. Question 4: Reaction stoichiometry
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question 1 the ice table for a reaction contains information about... .…
Question 1: the initial, change, and equilibrium concentrations of the molecules. Question 2: the equilibrium concentrations of all reactants and products.
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5. describe at least three different ways that you can identify the for…
1. Color change, e.g., iron rusting. 2. Gas production, e.g., vinegar and baking - soda reaction. 3. Temperature change, e.g., burning wood (exothermic) or ammonium nitrate dissol…
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4. look at the diagrams below. label them as a physical change or chemi…
Chemical change. The particles are combining to form new substances with different chemical properties, which is characteristic of a chemical change.
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3. which of the following options best provides observable evidence tha…
C. Production of a gas or precipitate or change in thermal energy or color
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2. a student mixed two liquids in a flask during science class. which o…
C. The formation of a new substance
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question 8 how does the equilibrium constant change if the reaction is …
It becomes the reciprocal ### Question 9
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if the equilibrium - constant for a reaction is 1, what can be inferred…
The concentrations of reactants and products are equal
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what does an equilibrium constant k >> 1 indicate? the reaction rate is…
The products are favored at equilibrium.
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question 7: if the equilibrium constant for a reaction is 1, what can b…
The concentrations of reactants and products are equal ### Question 8
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what does the equilibrium expression represent? the ratio of product to…
The ratio of product to reactant concentrations at equilibrium
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question 5: what does the equilibrium expression represent? the ratio o…
The products are favored at equilibrium. # Question 7:
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question 4 what signifies a reversible chemical reaction? a single arro…
B. A double arrow between reactants and products.
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question 1 why is equilibrium called a dynamic state? the forward and r…
Question 1: The forward and reverse reactions occur at the same rate. Question 2: The net concentrations of the reactants and products become constant. Question 3: All reactants a…
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3) please draw the structure of the products of the following reactions…
a. The product of reaction a is an alcohol with the hydroxyl group on the more substituted carbon of the original double - bond. b. The product of reaction b is an alkane with the…
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which of these is an example of a physical change? ○ a banana ripening …
A. liquid water turning into vapor
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which is an intensive property of a substance? density volume length ma…
density
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a student performs the following experiment. step 1: she pours a colorl…
A chemical change in step 1 and a physical change in step 2
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the energy derived from the digestion of food is __________. a. kinetic…
D. chemical energy
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which statement describes a physical property of copper? it reacts with…
It can be reshaped by a force.
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question 7 which of the following is not a way to calculate δg of a rea…
Estimate the value using Coulomb's Law
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question 6 at 298 k, what is the effect of increasing the temperature o…
Increases $\Delta G$
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question 3 what is the standard free energy change for a reaction where…
Question 3: $-147.3\ kJ$ Question 4: $0\ kJ$ Question 5: $-31.2\ kJ$
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question 1 what unit is commonly used to express the standard free ener…
Kilojoules (kJ) For Question 2: A spontaneous process has a negative standard free - energy change. So, $\Delta G=- 100\ kJ$ represents a spontaneous process.
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2. volume of a liquid if a solid, use a displacement for a solid) - mea…
The density of the aluminum is $2.7\ g/mL$
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87. hydrazine (n₂h₄) is a fuel used by some spacecraft. it is normally …
$-379.3\ kJ/mol$
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if the price of both organic eggs and non - organic eggs increases, whi…
Organic eggs