化學
化學反應、化學計量、分子結構與元素性質。
-
question 13 what is the stretching frequency (in cm⁻¹) of the following…
1685
-
question 12 0.5 pts what is the stretching frequency (in cm⁻¹) of the f…
1775
-
which of the following carbonyls have a stretching frequency around 171…
All of the above (the three carbonyl - containing compounds shown)
-
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?
-
which of the following carbonyls have a stretching frequency around 171…
All of the above (assuming the three structures shown are cyclohexanone, cyclopentanone, and benzoic acid)
-
question 10 what stretching frequencies (in cm⁻¹) are present in the st…
B. all of these
-
which of the following carbonyls have a stretching frequency around 174…
Fourth structure (carbonyl with - Cl group)
-
question 8 what is the stretching frequency (in cm⁻¹) of the following …
1800
-
which of the following carbonyls have a stretching frequency around 174…
none of these
-
directions: 1. answer the questions below by clicking the button next t…
A. carbon, oxygen, hydrogen, nitrogen, and sulfur
-
express each number in decimal notation. 1. $2.3\times10^{5}$ 2. $6.5\t…
1. $230000$ 2. $65000$ 3. $3000$ 4. $400000$ 5. $0.605$ 6. $0.00415$ 7. $0.003$ 8. $0.00004$ 9. $7.5$ 10. $8.2$ 11. $6.5\times10^{2}$ 12. $7.24\times10^{2}$ 13. $3.2\times10^{9}$ …
-
which of the following carbonyls have a stretching frequency around 168…
none of these
-
question 5 what is the stretching frequency (in cm⁻¹) of the following …
1685
-
clare was using steel to make rusted sculptures. after building each sc…
Independent variable: the type of liquid used Dependent variable: the number of rusted steel squares
-
question 3 what is the stretching frequency (in cm⁻¹) of the following …
1715
-
11. the ______ of the hair refers to the amount of movement or shape of…
11. B. wave pattern 12. A. Hair texture 13. C. Fine hair has the smallest diameter, whereas coarse hair has the largest diameter. 14. C. black 15. D. It refers to the hair's abili…
-
after completing a lab activity, all chemical wastes should be a. left …
B. Disposed of according to teacher directions
-
i celebrate myself, and sing myself, and what i assume you shall assume…
a self - confident voice that believes in connectedness to others
-
prepwork part i: atomic mass practice 1. examine the data for all natur…
a. A prediction could be that the average atomic mass is closer to 62.93 amu since the first isotope has a higher natural abundance. b. Copper (Cu) has an average atomic mass of a…
-
13. why does substance use increase the risk for suicide? answer: copyr…
Substance use can increase the risk for suicide through multiple mechanisms such as altering brain chemistry (e.g., disrupting neurotransmitter systems like serotonin which is inv…
-
it is around 10.5. that is more basic than baking soda and almost as al…
transition between descriptions of Lake Natron and the species that live there
-
prepwork part 1: avg. atomic mass calculations examine the mass spectru…
1. 2 2. Peak A 3. Peak B 4. 35.5; calculated using the formula for average atomic mass with given relative abundances and masses of isotopes. 5. Chlorine 6. 17
-
7. who developed the periodic table? (look it up!) 8. each box on the p…
7. Dmitri Mendeleev 8. Element 9. Atom
-
6. how many neutrons do the following elements have? atomic mass (botto…
Tungsten: 110 Nickel: 31 Fluorine: 10 Iron: 30 Sodium: 12 Hydrogen: 0 Nitrogen: 7 Silver: 61 Gallium: 39 Bismuth: 126 Rubidium: 48 Molybdenum: 54 Argon: 22 Cesium: 78 Silicon: 14 …
-
5. how many protons do the following elements have? magnesium____ zinc_…
magnesium: 12 zinc: 30 sodium: 11 barium: 56 carbon: 6 calcium: 20 chromium: 24 mercury: 80 iron: 26 copper: 29 francium: 87 phosphorous: 15 aluminum: 13 potassium: 19 hydrogen: 1…
-
4. find the following elements symbols: oxygen_ iron_ potassium_ nitrog…
oxygen: O iron: Fe potassium: K nitrogen: N carbon: C tin: Sn hydrogen: H calcium: Ca chlorine: Cl gold: Au silver: Ag neon: Ne sodium: Na copper: Cu arsenic: As krypton: Kr niobi…
-
instructions: silently and independently, answer the following equation…
1. #of sig figs: 2, Final answer: $5.9\ g$ 2. #of sig figs: 3, Final answer: $107\ g$ 3. #of sig figs: 6, Final answer: $2300.12\ g$ 4. #of sig figs: 2, Final answer: $9.3\ mL^{3}…
-
question 10 americium has protons neutrons electrons
Protons: 95 Neutrons: 148 Electrons: 95
-
question 9 radon 86 rn 222 radon has protons neutrons electrons
Protons: 86 Neutrons: 136 Electrons: 86
-
question 8 gold has protons neutrons electrons
Protons: 79 Neutrons: 118 Electrons: 79
-
question 7 54 xe xenón 131.29 xenon has protons neutrons electrons
Protons: 54 Neutrons: 77 Electrons: 54
-
36 kr krypton 83.80 krypton has protons neutrons electrons (unlike prev…
Protons: 36 Neutrons: 48 Electrons: 36
-
question 5 ar ar argon 39.9 argon has protons neutrons electrons
Protons: 18 Neutrons: 22 Electrons: 18
-
question 4 neon has protons neutrons electrons
Protons: 10 Neutrons: 10 Electrons: 10
-
question 3 oxygen has protons neutrons electrons
Protons: 8 Neutrons: 8 Electrons: 8
-
carbon 6 c 12.011 carbon has protons neutrons electrons
Protons: 6 Neutrons: 6 Electrons: 6
-
lets talk vocab...cosmetology: infection control for cos match the defi…
42. AIDS 43. Non - porous 44. Tinea barbae 45. CDC (Centers for Disease Control and Prevention) 46. Acquired immunity 47. Disinfection 48. Tinea capitis 49. Antiseptic 50. Parasit…
-
what are two reasons scientists might use a model to study what happens…
A. The molecules in the reaction are too small to see. C. The process is very dangerous to study.
-
markus is reading a sonnet by william shakespeare. which will best help…
finding a single concept that links the lines together
-
ms. jameson is using sonnet 18 by william shakespeare to teach her stud…
D. aa
-
rhyme scheme. so long as men can breathe or eyes can see, so long lives…
D. aa
-
1. why do water molecules at the surface of a pond have elastic - like …
Water molecules are polar and hydrogen - bond. Surface molecules have a net inward pull due to fewer neighbors above, creating surface tension.
-
at the beginning of a chemistry experiment, the volume of liquid in a c…
$15$
-
when chemicals in the air impact the weathering of rocks the interactio…
D. atmosphere and geosphere
-
which sequence of elements is arranged in order of decreasing atomic ra…
A. Al, Si, P
-
6 multiple choice 3 points something that is only made of one kind of a…
C. Pure Substance
-
5 multiple choice 3 points when you pour salt into water and mix it unt…
D. Solution
-
4 multiple choice 3 points this is a type of mixture where everything i…
C. Homogeneous mixture
-
2 multiple answer 3 points this question has multiple answers. which of…
A. Salt water C. Lemonade E. Kool - aid
-
1 categorization 5 points put the correct mixture with the correct word…
Homogeneous Mixture: Ketchup, Coffee, Lemonade, Green jello, Vanilla ice cream Heterogeneous Mixture: Boba tea, Pepperoni pizza, Salad, Cookies and Cream ice cream, Chex Mix
-
question 5 (2 points) which subatomic particle will you add or remove f…
B. protons and neutrons
-
question 4 (2 points) which subatomic particle will you add or remove f…
A. protons, C. electrons
-
question 3 (2 points) which subatomic particle will you add or remove f…
protons
-
what is the charge of this atom?
0
-
read the passage all that stirring of old instincts which at stated per…
Instinctual joy in chasing the rabbit and leading the pack
-
what is the mass of this atom?
7 amu
-
statement of stockholders equity financial information related to organ…
a. | Line Item Description | Amount | |--|--| | Common Stock | $230,000$ ($180,000 + 50,000$) | | Retained Earnings | $1,720,000$ | | Total | $1,950,000$ | b. The statement of sto…
-
2. classify each underlined word as an element, compound, homogeneous m…
a. Compound b. Heterogeneous mixture c. Heterogeneous mixture d. Homogeneous mixture e. Compound f. Compound g. Homogeneous mixture h. Compound i. Heterogeneous mixture j. Element
-
problem 3: ions are atoms that have a charge, positive or negative. thi…
1. 1 2. 0 3. + 1e
-
problem 2: an atoms has 6 protons, 6 neutrons, and 6 electrons, identif…
Carbon
-
consider the following equation. fe₂o₃(s) + al(s) → fe(l) + al₂o₃(s) ca…
3.985 mol
-
400.0 ml of a 0.310 m solution of nacl is diluted to 900.0 ml. what is …
$0.138\ M$
-
ch 10 hair brushing contraindications quiz question 2 of 5 1 point alwa…
False
-
problem 1: 1 create 3 examples of stable atoms using the simulation 2 i…
1. Hydrogen - 1: Protons = 1, Neutrons = 0, Electrons = 1, Element name: Hydrogen 2. Helium - 4: Protons = 2, Neutrons = 2, Electrons = 2, Element name: Helium 3. Carbon - 12: Pro…
-
acetone is used in the manufacture of many chemicals and also as a solv…
$A\approx1178.95$ kg/hr, $F\approx221.05$ kg/hr, $W = 0$ kg/hr, $B\approx186.15$ kg/hr, $D\approx34.90$ kg/hr
-
what quantity in moles of k₂s will be required to completely react with…
$0.0231\ mol$
-
what quantity in moles of hcl is there in 75.0 ml of 0.455 m hcl?
$0.0341\ mol$ (rounded to three significant figures)
-
if 50.0 g of h₂ and 158.5 g of o₂ react, how many moles of h₂o can be p…
$9.906\ mol$
-
if 69.9 g of aspirin (c₉h₈o₄) are produced from 79.8 g of c₇h₆o₃, what …
67.1%
-
consider the following equation. $pb(no_3)_2(aq)+k_3po_4(aq)\to pb_3(po…
$1.35\ mol$
-
what component of a chemical reaction is highlighted in red? 2h₂(g) + o…
D. reactants
-
100.0 ml of a 0.500 m kbr solution is diluted to 500.0 ml. what is the …
$0.100\ M$
-
question 9 4 pts identify the element symbol for the element barium. be…
C. Ba
-
a student is doing research on elements that have low luster and limite…
area 4
-
what component of a chemical reaction is highlighted in red? fe₂o₃(s) +…
subscripts
-
which of the following elements would be the least similar to the other…
Na
-
600.0 ml of a 0.490 m solution of licl is diluted to 900.0 ml. what is …
$0.327\ M$
-
question 6 elements on the stair step line are unique because they have…
They have properties of both metals and nonmetals.
-
what is the coefficient in front of the o₂ when the equation below is b…
7
-
what quantity, in moles, of no₂ would be required to produce 4.95 mol o…
$7.425$ mol
-
if 10.0 moles of o₂ are reacted with excess no in the reaction below, a…
18.5%
-
which of the following reasons explains why dmitri mendeleev is credite…
He was the first to correctly predict the properties of elements that had not been discovered yet.
-
which major branch of chemistry would be most concerned with researchin…
# Breve explicación: La bioquímica se centra en las reacciones químicas que ocurren en los organismos vivos, incluyendo las que tienen lugar durante la digestión de los alimentos.…
-
if 10.0 moles of o₂ are reacted with excess no in the reaction below, a…
18.5%
-
a student is looking for an element with 79 protons. which of the follo…
Look at the number at the top of the square called the atomic number.
-
some chemists are interested in studying the rates of chemical reaction…
a. física orgánica química
-
a paper clip can be bent and reshaped based on the users needs. which o…
malleability, metal
-
if 0.184 moles of nacl are dissolved in a 250.0 ml solution, what is th…
$0.736$
-
question 2 which pair of elements has the most similar properties? i an…
Li and Rb
-
which branch of chemistry would be most concerned with measuring the el…
# Breve explicación: La química física se centra en estudiar las propiedades físicas de los materiales, incluyendo propiedades eléctricas de las soluciones. Las otras ramas mencio…
-
question 1 4 pts which statement best explains how periods on the perio…
increasing atomic number from left to right
-
which type of chemist would be most likely to use an instrument called …
# Breve explicación: La química analítica se centra en la identificación y cuantificación de compuestos químicos en una muestra. Un espectrofotómetro es una herramienta común en l…
-
enzymes are large molecules that help chemical reactions occur more qui…
# Breve explicación: Las enzimas son moléculas biológicas importantes y el estudio de enzimas con átomos de metales (como cobre o magnesio) se asocia con la química bioinorgánica,…
-
enzymes are large molecules that help chemical reactions occur more qui…
# Breve explicación: Las enzimas son moléculas biológicas y la química bioanalítica se ocupa de analizar compuestos biológicos, incluyendo enzimas. La química bioorgánica también …
-
drug testing of athletes and other individuals can be accomplished with…
# Breve explicación: La prueba de drogas implica la detección y análisis de sustancias químicas en muestras biológicas como sangre y orina. La bioanálisis químico se centra en la …
-
which major branch of chemistry would be most concerned with studying t…
d. orgánica
-
which major branch of chemistry would be most concerned with investigat…
# Breve explicación: La química inorgánica se ocupa de los compuestos químicos que no son orgánicos, y la extracción de un metal como el níquel de rocas y sedimentos es un tema de…
-
which major branch of chemistry would be most concerned with quantifyin…
# Breve explicación: La química analítica se centra en cuantificar y determinar los componentes y la composición de una muestra de materia, ya sea orgánica o inorgánica. Las otras…
-
multiple - choice question how many protons and electrons does this cop…
29 protons, 29 electrons
-
which branch of chemistry would be most concerned with synthesizing new…
# Breve explicación: La química orgánica se centra en los compuestos que contienen carbono. La síntesis de nuevos compuestos carbon - contenidos es un tema central en la química o…