Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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unit exam - chemistry is a laboratory science. what does this symbol in…
The chemical is corrosive to metal or to living things.
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which of these is a common use for an erlenmeyer flask? it is used for …
It is used for swirling the contents during a reaction to help mixing.
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identify this piece of lab equipment. graduated cylinder erlenmeyer fla…
B. Erlenmeyer flask
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which of these is true for a molecular model like the one shown? the mo…
The model shows how the various atoms are connected in the molecule.
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which type of chemistry studies changes to the nucleus of the atom? org…
C. Nuclear Chemistry
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question 1 (1 point) saved which of the following factors are involved …
all of the above
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which type of chemistry studies the interactions of atoms and molecules…
C. Biochemistry
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unit exam - chemistry is a laboratory science which type of chemistry s…
C. Biochemistry
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which indication of chemical reaction is not observed in this experimen…
energy (temperature) change
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which of these is an indicator of a chemical reaction during an experim…
A. bubble formation
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why are some of the circles marked with an \x\ for the experiment? the …
The X tells us to look closely for a reaction in those containers.
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why are some of the circles marked with an \x\ for the experiment? the …
The X tells us to look closely for a reaction in those containers.
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precipitate as shown below. precipitate forms which well choice should …
Well K
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15. circle the letter of each substance that dissolves in water. a. sal…
15. a. salt 16. hydrophobic 17. specific heat 18. True 19. c. It makes large bodies of water cool off more slowly than nearby land. 20. It helps regulate body temperature by absor…
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15. circle the letter of each substance that dissolves in water. a. sal…
15. a. salt 16. hydrophobic substance 17. specific heat 18. True 19. c. It makes large bodies of water cool off more slowly than nearby land.
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for parts of the free - response question that require calculations, cl…
(i) Draw Xe atoms in a closely - packed, regular pattern in diagram 1 box to represent solid Xe. (ii) Draw Xe atoms scattered with large spaces between them in diagram 2 box to re…
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draw the major substitution products you would expect for the reaction …
The product will be a molecule with the $SH$ group in place of the $Br$ group, with the $SH$ group having a configuration opposite to the original $Br$ group (using wedge - dash b…
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12. how does capillary action allow water to climb up the sides of a st…
12. Capillary action is a result of adhesion and cohesion. 13. Solvent; Solute 14. Water is a polar molecule, so it can attract and surround ions and polar molecules of other subs…
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10. what is a curved surface in a graduated cylinder called? a 11. circ…
a. It explains how water moves against the force of gravity. 11.
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10. what is a curved surface in a graduated cylinder called? a 11. circ…
a. It explains how water moves against the force of gravity. 11.
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6. a force that acts on the particles of a liquid at the surface is cal…
6. Surface tension 7. Cohesive forces between water molecules 8. Adhesion 9. a. It helps some insects "skate" across the surface of the water. b. It refers to the tightness across…
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a. water is a polar molecule. c. water is an ionic compound. b. water i…
a. Water is a polar molecule. 5. True 6. Surface tension 8. Adhesion
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1. circle the letter of each sentence that is true about waters structu…
1. d. The chemical formula for water is H₂O. 2. a. Water is a polar molecule. 3. Hydrogen bonds.
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which of the following are optically active? check all that apply.
The optically active structures are the first, second, fourth, and seventh ones.
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b. breaking the graham crackers into two pieces c. roasting the marshma…
1. c. Roasting the marshmallows 2. d. Oxidize it
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for parts of the free - response question that require calculations, cl…
For (i): Draw closely - packed, regularly arranged circles in the box of Diagram 1 to represent solid Xe. For (ii): Draw a few scattered circles with large spaces between them in …
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a student uses a spectrophotometer to analyze a solution of blue food d…
A. The measured absorbance would be too low, because the distilled water left in the cuvette would slightly dilute the solution.
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a student measures the absorbance of a solution containing fescn²⁺ ions…
B. The measured absorbance of the $\text{FeSCN}^{2 + }$ solution will be higher than the actual absorbance.
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the absorption spectrum of a certain red dye is shown above. if a stude…
A. The peak of the curve would be higher because more light would be absorbed.
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one type of organic molecule can be converted to another type of organi…
B. The absorption of infrared radiation leads to an increase in molecular vibrational level associated with the stretching of the carbonyl.
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carbon is very good at making multiple bonds with other atoms because i…
4 valence electrons
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suppose all the chlorine atoms in this molecule are replaced by hydroge…
=
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the infrared spectrum above represents the absorption of certain wavele…
A. The atoms in the $CO_2$ molecules increase their vibration as the bonds between the atoms bend and stretch.
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which of the following best explains what happens as photons of visible…
A. Certain electrons in the dye molecule move to a higher energy level, with the difference in energy between the lower and higher energy levels being the same as the energy of th…
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in each box, write the number of hs that each labeled carbon has. for e…
a: 1 b: 1 c: 2
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which of the diagrams above best represents the interactions that are r…
A. Diagram 1, because strong ion - dipole interactions between KCl and water help to dissociate the solute.
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a student adds a 1 g sample of an unknown, brittle solid to distilled w…
A. The increase in conductivity indicates that the unknown is an ionic solid that dissociates into ions when it dissolves in water.
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12. which of the following is not true about matter in the biosphere? a…
a. Matter is transferred in one direction through the biosphere., c. The total amount of matter decreases over time., d. Human activity does not affect the movement of matter.
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methanol, ch₃oh, dissolves completely in water to form a solution that …
A.
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the diagram above shows thin - layer chromatograms of the same mixture …
D. Solvent D
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which of the following methods is most appropriate to use to determine …
D. Paper chromatography using different solvents with a range of polarities as the mobile phase
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big idea/ learning goal demonstration 1. name the following molecules: …
a. 3 - ethyl - 2,4 - dimethylhexane b. trans - but - 2 - ene c. 5 - fluoro - 4 - methylhex - 2 - yne d. 3 - cyclopentyloctane
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determination of a chemical formula name: brady hoag partner: lina thak…
g. $0.6$ h. $0.00236$ i. $0.41$ j. $0.0063$
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substance lewis diagram molar mass (g/mol) density (g/ml) boiling point…
B. Distillation
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12. which of the following is not true about matter in the biosphere? a…
A. Matter is transferred in one direction through the biosphere, C. The total amount of matter decreases over time, D. Human activity does not affect the movement of matter.
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1. name the following molecules: a. b. i can name organic compounds. c.…
a. 3 - ethyl - 3,4 - dimethylhexane b. 2 - methyl - 2 - butene c. 5 - fluoro - 2 - hexyne
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how many grams of nacl (molar mass = 58 g/mol) are needed to prepare 10…
D. 1.5 g
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a 500. ml aqueous solution of na₃po₄ (molar mass = 164 g/mol) was prepa…
D. 1.0 M
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what volume of a 0.100 m hcl stock solution should be used to prepare 2…
C. 62.5 mL
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the graph above shows how a particular real gas deviates from ideal beh…
D. $SO_2$ because it has the largest molecular volume.
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big idea/ learning goal demonstration 1. name the following molecules: …
a. 3 - ethyl - 2,4 - dimethylhexane b. trans - but - 2 - ene
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c. bend it d. oxidize it 7. which of the following situations demonstra…
7. c. Melting of ice 8. a. Cooking eggs
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precipitate as shown below. precipitate forms which well choice should …
There is not enough information to determine a correct answer from the given options.
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co₂(g) and nh₃(g) can be liquefied at 20 °c by compressing them to suff…
D. CO₂ is a nonpolar molecule that has London dispersion intermolecular forces
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1. michael decides to bake bread one morning. he measures ingredients, …
1. b. The bread rising as carbon dioxide is released. 2. d. A physical change. 3. b. Rotten orange 4. d. A physical change. 5. c. Roasting the marshmallows 6. None of the above op…
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equimolar samples of ch₄(g) and c₂h₆(g) are in identical containers at …
B. \(C_2H_6\) molecules have a larger, more polarizable electron cloud than \(CH_4\) molecules do.
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the two gas samples represented in the graph above are at the same temp…
C. Gas Z has a smaller molar mass than gas X
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worksheet: chemical bonding - ionic & covalent remember... ionic bond b…
| Compound | Element 1 (metal or non - metal) | Element 2 (metal or non - metal) | Bond Type | | ---- | ---- | ---- | ---- | | NaCl | Na = metal | Cl = non - metal | ionic | | SO₂…
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the two gas samples represented in the graph above are at the same temp…
None of the provided options (A and B) are correct based on the given information.
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two sealed, rigid 5.0 l containers each contain a gas at the same tempe…
A. The total pressure of the gases in the mixture is the sum of the initial pressures because pressure only depends on the total amount of gas and nitrogen and oxygen gas behave a…
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two sealed, rigid 5.0 l containers each contain a gas at the same tempe…
The total pressure in the mixture is the sum of the initial pressures of the gases in the mixture because pressure depends on the total number of gas particles and when volume and…
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the structures of two allotropes of carbon are represented above. which…
C. Carbon atoms in diamond have four covalent bonds, whereas graphite is made of layers held together by relatively weak dispersion forces.
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the crystal structure of nabr is represented in the diagram above. whic…
B. Crystalline NaBr and molten NaBr both contain ions that are held in fixed positions due to strong electrostatic attractions among the ions, making neither a good electrical con…
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the diagrams above represent two allotropes of solid phosphorus. which …
B. Allotrope II because it has covalent bonds between the phosphorous atoms that are stronger than the dispersion forces between the P₄ molecules in allotrope I
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a solid compound of a group 1 (alkali) metal and a group 17 (halogen) e…
B. The particle is a negative ion, and the interactions are ion - dipole attractions.
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the diagram above represents four cations, all shown to the same scale.…
B. $Mg^{2+}$, because it has the largest charge - to - size ratio.
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which particle - diagram shown above best represents the strongest inte…
C. Because it shows the formation of a hydrogen bond between an O atom bonded to an H atom in one ethanol molecule and an O atom from another molecule.
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the calibration is to 1 ml so we can estimate another digit. what is th…
53.9 mL
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which particle - diagram shown above best represents the strongest inte…
A. Diagram 1, because it shows hydrogen bonds forming between hydrogen atoms from different ethanol molecules.
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the calibration is to the 2 ml, so we do not estimate another place val…
36 mL
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which particle - diagram shown above best represents the strongest inte…
C. Because it shows the formation of a hydrogen bond between an O atom with an O atom bonded to an H atom from another molecule.
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to what place value can you estimate the volume in a beaker having a ca…
the tenths place
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suppose you have a graduated cylinder with a calibration of 1 ml. how p…
to the nearest 1 milliliter
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suppose you have a graduated cylinder with a calibration of 1 ml. how p…
to the nearest 1 milliliter
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suppose you have a graduated cylinder with a calibration of 10 ml. how …
to the nearest 1 milliliter
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7. which of the following models the relative amount of energy or matte…
C. ecological pyramid
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2. what type of chemical reaction took place when you mixed lead (ii) n…
1. Double - displacement reaction for lead (II) nitrate and potassium iodide. 2. $Pb(NO_3)_2+KI ightarrow PbI_2 + KNO_3$ (skeletal), $Pb(NO_3)_2 + 2KI ightarrow PbI_2+2KNO_3$ (bal…
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which statement best describes the rhythm of \song of myself\? the poem…
The rhythm is very similar to the rhythm of everyday speech
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periodic table basics 1. which elements had complete outer shells? give…
Hydrogen - H, Lithium - Li, Sodium - Na 2.
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fill in the systematic names of the following chemical compounds. note:…
| molecular formula | name of compound | | ---- | ---- | | $CS_2$ | carbon disulfide | | $BP$ | boron phosphide | | $C_3S_2$ | tricarbon disulfide | | $BI_3$ | boron triiodide | |…
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prefixes and suffixes are important in science to help understand the m…
B. round, 3 - dimensional object
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2. calculate the atomic mass of boron using the isotopes listed below. …
= 10.82amu
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extra credit: the horizontal rows of the periodic table of elements are…
B. Periods
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professor flores has been teaching introduction to chemistry for three …
C. automatic
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by changing the number of protons in an element you can change the? ¿al…
name of the element
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ions are atoms with a charge. one charge is positive, one is negative. …
B. Cation, D. Anion
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which element has the largest atomic radius in each pair? 1. lithium or…
1. Potassium 2. Phosphorus 3. Calcium 4. Carbon
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2025 chemistry unit test shaughnessy part a: multiple choice choose the…
(e) 2.
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the passage below describes an experiment. in each of three bowls, tom …
Does water mixed with salt evaporate faster than water mixed with sugar?
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the passage below describes an experiment. lemon juice can cause milk t…
Does the type of milk affect the size of clumps formed when the milk curdles?
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worksheet 2 1. (multiple choice) which of the following is not part of …
# Breve Explicación: 1. Los peligros Focus Four son las caídas, ser atrapado - en / entre, la electrocución y las lesiones por impactos con objetos. El fuego no es parte de ellos.…
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part b. instructions: for each of the following changes, identify it as…
1. Physical change 2. Chemical change 3. Physical change 4. Physical change 5. Physical change 6. Chemical change 7. Chemical change 8. Chemical change 9. Chemical change 10. Phys…
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#7 chemistry a schoology 2025 12. explain what ionization energy is mea…
Ionization energy is the energy needed to remove an electron from a gaseous species. The pattern is an increase across a period and a decrease down a group. Arrows on the periodic…
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the passage below describes an experiment. franklin remembered hearing …
Does the temperature of a soda affect how much carbonation it loses over time?
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b. play around, and write down three examples of atoms that have a stab…
| Number of particles in your nucleus: | Take a Screenshot of your atom | What element is it? | | ---- | ---- | ---- | | Protons: 1<br>Neutrons: 0 | (Screenshot not provided here,…
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i dont understand the periodic table of elements. can you explain why t…
Elements on the left side of the periodic table have low ionization energy and few valence - electrons, so they give away electrons. Elements on the right side have high electrone…
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the passage below describes an experiment. when baking soda and vinegar…
Does the type of vinegar added to baking soda affect how long the mixture bubbles?
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part a. instructions: for each of the following descriptions, identify …
1) Physical property 2) Chemical property 3) Physical property 4) Physical property 5) Physical property 6) Chemical property 7) Physical property 8) Chemical property 9) Physical…
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11. explain what electronegativity is measuring and describe the patter…
Electronegativity measures an atom's electron - attracting ability in a bond. The pattern is that it increases across a period and decreases down a group. Draw arrows pointing lef…
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2. prepare 45 ml of 0.15 m naoh from 0.8 m naoh solution 3. you add 30 …
2. Take 8.44 ml of 0.8 M NaOH solution and dilute to 45 ml. 3. 11 4. $\frac{1}{50000}$ 5. Dilution factor: $\frac{1}{1250}$, Concentration: 0.0032 M, Volume: 1.25 L