Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
-
in each of the molecules drawn below one chemical bond is colored red. …
1. The highlighted bond is polar and the more negative atom is F 2. The highlighted bond is polar and the more negative atom is N 3. The highlighted bond is polar and the more neg…
-
re - order each list of elements in the table below, if necessary, so t…
O, Se, As; F, Cl, I
-
6 fill in the blanks to complete the sentences. not all the words used.…
When heated, the closely packed and tightly bound molecules of a solid move more quickly. Eventually, they break loose from their structure and become a liquid. As the molecules m…
-
1 what happens to waters chemical makeup when it changes state? a water…
D. Its chemical makeup stays the same
-
6 why dont solids take the shape of their container? a they have a fixe…
B. Their molecules are arranged in a rigid structure
-
guide questions: 1. which glassware would you select if an experiment r…
1. A volumetric pipette because it is designed for delivering a specific, accurate volume. 2. It can leak, break further, cause injury, or contaminate reactions. 3. They have more…
-
5 classify each of the following as describing the molecules in a solid…
Solid: vibrating slowly, close together Gas: spread out, moving quickly
-
1 what happens to waters chemical makeup when it changes state? a water…
D. Its chemical makeup stays the same
-
guide questions: 1. which glassware would you select if an experiment r…
1. A volumetric pipette because it is designed for delivering a single, precise volume. 2. It can leak chemicals, break further, cause injury, or contaminate reactions. 3. They ha…
-
b. how many stereoisomers are possible for this monosaccharide? an erro…
4
-
a. how many stereocenters are present in this monosaccharide?
1
-
give the correct names for the types of sugars s a. cho ho—c—h ho—c—h c…
Glyceraldehyde
-
guide questions: 1. why is laboratory attire (ppe) non - negotiable in …
1. Protects against chemical and physical hazards. 2. Rinse with large amounts of water to reduce damage. 3. To prevent ingestion of contaminated food/drinks. 4. Ensure safety, id…
-
re the correct names for the types of sugars shown a. cho ho c h ho c h…
Glyceraldehyde
-
what is the pressure of 4 moles of helium in a 50 l tank at 308 k? use …
D. 2.02 atm
-
what is the partial pressure of a gas in a mixture of gases? a. the sum…
C. The pressure exerted by one gas in a mixture
-
question 4 of 10 what is stp? a. the conditions of 0°c and 1 atm pressu…
A. The conditions of 0°C and 1 atm pressure
-
which of the following is an expression of avogadros law (k = constant)…
B. $V = kn$
-
what kind of reaction is symbolized by ab + c → cb + a? a. double repla…
C. Single replacement
-
what information does a molecular formula give? a. the order in which a…
C. The actual number of atoms in a molecule
-
what is molarity a measure of? a. density b. volume c. mass d. concentr…
D. Concentration
-
what does the vsepr theory predict? a. valence electrons will pair up w…
D. Valence electron pairs will move as far apart from each other as possible.
-
which term describes a change that occurs with no new substances being …
A. Physical change
-
which of the following represents c4h10?
A.
-
what is the correct name for na₂o? a. sodium dioxide b. disodium oxide …
C. Sodium oxide
-
which of the following equations is balanced? a. na₂so₄(aq) + cacl₂(aq)…
B. \(Na_2SO_4(aq)+CaCl_2(aq) ightarrow CaSO_4(s) + 2NaCl(aq)\)
-
what is stoichiometry used for? a. to determine the atoms in a formula …
D. To determine the amount of a substance
-
question 1 of 10 a steam engine depends on what kind of energy conversi…
C. Heat energy to kinetic energy
-
what is the molarity of 2 moles of a compound dissolved in 4 l of water…
B. 0.5 M
-
in the reaction mgcl₂ + 2koh → mg(oh)₂ + 2kcl, how many moles of koh re…
A. 2
-
what information do the coefficients of a balanced equation give about …
D. The coefficients give the molar ratio of the reactants.
-
which equation shows how to calculate how many grams (g) of mg(oh)₂ wou…
A. $\frac{4\ mol\ KOH}{1}\times\frac{1\ mol\ Mg(OH)_2}{2\ mol\ KOH}\times\frac{58.31\ g\ Mg(OH)_2}{1\ mol\ Mg(OH)_2}$
-
what is the average atomic mass of an element with isotopes a, b, and c…
C. (mass of A) × (% of A) + (mass of B) × (% of B) + (mass of C) × (% of C)
-
why is the average atomic mass used when calculating grams of a substan…
A. The elements in the substance are mixtures of their isotopes.
-
question 4 of 10 what is the theoretical yield of a reaction? a. the am…
D. The amount of product that is possible in a reaction
-
what determines the effect of a limiting reagent on the mass of a produ…
B. The amount of the limiting reagent
-
in the reaction mgcl₂ + 2koh → mg(oh)₂ + 2kcl, if 1 mole mgcl₂ is added…
C. $MgCl_2$
-
how is stoichiometry used to calculate amount of product from amount of…
B. The coefficients give the ratio of moles reactant to moles product.
-
what is the net ionic equation for this reaction? 2koh(aq) + h₂so₄(aq) …
C. $OH^- + 2H^+ ightarrow2H_2O(l)$
-
what are spectator ions? a. ions that combine to form a precipitate b. …
B. lons that are not changed in the reaction
-
how many molecules does 1 mole of o2 gas have? a. 3.01 × 10^23 molecule…
D. $6.02\times 10^{23}$ molecules
-
what is the molarity of 2 mol of ki dissolved in 1 l water? a. 3 m b. 0…
D. 2 M
-
which of the following would be produced in a combustion reaction? a. h…
C. Carbon dioxide
-
question 20 of 25 finish balancing the following equation: _al(s) + 3zn…
B. 2
-
the solubility table helps predict the products of what kind of reactio…
D. Double - replacement
-
what type of reaction is zn + cucl₂ → cu + zncl₂? a. single - replaceme…
A. Single - replacement
-
which reaction would be predicted by the activity series list? a. a met…
A. A metal replaces a metallic ion below it on the list.
-
what coefficient will o2 have after balancing this equation? c4h8 + o2 …
C. 6
-
which drawing is a structural model of c₃h₈? a. b. c. d. h - c - c - c …
B.
-
in the reaction 2li(s) + 2h₂o(l) → 2lioh(aq) + h₂(g), which compound is…
D. $H_2$
-
what is the general form of a single - replacement reaction? a. ab + cd…
B. AB + C → CB + A
-
how many moles is 573.28 g of agcl? a. 5 mol b. 4 mol c. 2 mol d. 3 mol
B. 4 mol
-
the mass of 1 mole of an element (in grams) is the same as which quanti…
C. The atomic mass of the element in atomic mass units
-
the reactants of a reaction are 2agclo₃ and na₂co₃. according to the la…
C. $Ag_2CO_3$
-
in the reaction a + b → c + d, what are the reactants? a. just b b. c a…
D. A and B
-
what does a mole represent? a. the number of protons in a nucleus b. th…
C. A very large, specific number of items
-
what is the percent composition of magnesium (mg) in mgo? a. 70% b. 40%…
D. 60%
-
for the group of four atoms or ions provided below, please select the s…
Zn²⁺, Cu⁺
-
complete the paragraph to explain why water is a polar molecule. in a m…
In a molecule of water, the oxygen atom shares a pair of electrons with each hydrogen atom. Oxygen also has two nonbonding pairs of valence electrons. Because valence electrons ar…
-
complete the following table. identify the type of bonding in each subs…
| Substance | Bonding | Highest Melting Point | |--|--|--| | $S_8$ | Covalent (intramolecular), London - dispersion (intermolecular) | $\bigcirc$ | | $CCl_4$ | Covalent (intramole…
-
study the following sketch of a molecular orbital (mo) in a homonuclear…
| Property | Answer | |--|--| | Write the symbol for this MO. | $\sigma$ | | Is this a bonding or antibonding MO? | bonding | | What is the energy of this MO, compared to the ener…
-
question 15 (1 point) quantities of water and 8.00 mol/l potassium nitr…
525 mL of 8.00 mol/L potassium nitrate and 175 mL of water
-
question 14 (1 point) a solution contains 0.90 g of sodium chloride dis…
0.15 mol/L
-
question 12 (1 point) what is the minimum number of moles of hno3 neede…
16
-
question 11 (1 point) if 24 g of c is consumed in 2 c + o2 → 2 co, the …
56 g
-
question 10 (1 point) what is the percentage, by mass, of oxygen in the…
15.2%
-
question 9 (1 point) 4 moles of co2 has mass of. 176 g 112 g 44 g 12 g
176 g
-
question 8 (1 point) the gram molecular mass (in g/mol) of h2so4 is 49 …
98
-
question 7 (1 point) the reaction: mgcl2(aq) + 2 naoh(aq) → 2 nacl(aq) …
double displacement
-
question 6 (1 point) the coefficient of fe3+ in the balanced version of…
3
-
question 5 (1 point) the coefficient of o2 in the balanced version of c…
2
-
7. what is the main difference between the rhythm of shakespeares poetr…
B. Unlike most poets today, Shakespeare used a regular meter and rhyme scheme.
-
question 4 (1 point) which of the following bonds is the most polar? el…
K - Cl
-
question 4 (1 point) which of the following bonds is the most polar? el…
The K - F bond is the most polar.
-
question 3 (1 point) if ion x has a charge 2+ and ion y has charge 3-, …
\(X_{3}Y_{2}\)
-
question 2 (1 point) 1. which of the following is not the correct name …
I. cuprous sulphate
-
5. calculate the atomic mass of copper if copper - 63 is 69.17% abundan…
63.62 amu ### 6a.
-
the law of conservation of mass says that matter * can not be created o…
1. A. can not be created or destroyed. 2. D. 1100 grams
-
what is malleability? * ability to be pulled into a wire will change te…
D. can be hammered/ flattened into sheets
-
4. titanium has five common isotopes: $^{46}ti (8.0%)$, $^{47}ti (7.8%)…
$47.923$
-
elements found on the left of the zig - zag are called * metals nonmeta…
A. metals
-
practice looking at elements on the periodic table by visiting this web…
2 electrons in the inner shell and 6 in the outer shell
-
examples of pure substances are * - elements and mixtures - elements an…
B. elements and compounds
-
3. strontium consists of four isotopes with masses of 84 (abundance 0.5…
$87.712$
-
which of the following are always positive? proton electron neutron ato…
1. proton 2. the same type of atom with different number of neutrons
-
part b while studying chemical and physical changes, students added sal…
B. No, it is a physical change. It is salt and water and you can get the salt back by boiling off the water.
-
part a consider the images depicting change. which statement accurately…
D. The pipes in image I are going through a chemical change called rusting; the evidence is the color change.
-
the stock market and financial markets of the united states and other i…
No information is provided in the given text to determine the number of active participants in the insider - trading scheme. So, it is not possible to answer from the given option…
-
when ice melts, what happens to the water molecules? a the attractions …
A. The attractions between the water molecules weaken.
-
following is a list of observations from a chemistry laboratory. place …
Evidence of a chemical change: Burning toast, A candle being lit, A car rusting, A white cloudy substance occurs after mixing two clear solutions, Leaves changing color in October…
-
the circles and dots in the boxes below represent atoms of two differen…
B. Box M
-
which image displays a chemical property about a substance? choose all …
A. II and IV
-
question 4 (2 points) saved while assessing a child, a nurse finds a ch…
Question 4: Chemical burns Question 5: Diminished bowel and bladder function Question 6: Superficial burns
-
read the excerpt adapted from wikipedia and try answering the question …
B. technical jargon
-
what is the formula for dinitrogen tetroxide? * 5 points no4 n4o2 n2o n…
D. N2O4
-
which of these is a polar covalent bond? (hint: nonpolar covalent bonds…
H2O
-
which of the following best explains what happens to electrons when an …
The metal atom loses one or more electrons, becoming a positively charged ion, while the nonmetal atom gains those electrons, becoming a negatively charged ion. The opposite charg…
-
what is the name for sf6?* sulfur fluoride hexasulfur monofluoride sulf…
1. C. Sulfur Hexafluoride 2. C. $BaCl_2$ 3. A. Cations
-
lons will... * 5 points neutral atom loss of electron(s) gain of electr…
C. Transfer electrons
-
what is the name of nacl * sodium chloride sodium chlorine sodium (i) c…
1. A. Sodium Chloride 2. B. IF5 3. C. CO2