Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
-
2. in which situation should gloves be worn in the laboratory? when che…
When chemicals that can damage the skin are being used
-
multiple choice 10 points which statement describes the structure of a …
7. It is composed of two hydrogen atoms covalently bonded to a central oxygen atom. 8. The tetrahedral structure around oxygen forces the hydrogen atoms to form an angle.
-
apply medical terminology for each specialty 5 of 5. in the term intrac…
1. within 2. ischemic stroke
-
apply medical terminology for each specialty 0 of 5. which of the follo…
C. embolic stroke D. thrombotic stroke
-
why couldnt mendeleev organize the entire table during his research? th…
Some elements were undiscovered at the time.
-
what is one way to describe elements? they break down easily. they are …
They are the building blocks of matter.
-
what happens when nitrogen fills its valence shell? ○ three electrons a…
Three electrons are gained, creating $N^{-3}$
-
what are groups 1, 2, and 3 examples of on the periodic table? metalloi…
C. metals
-
select a word from the drop - down menu to correctly complete the state…
Group
-
most of the substances around you exist in three common states of matte…
solid: first diagram (tightly - packed particles); gas: second diagram (particles spread far apart); liquid: third diagram (particles close together and able to slide)
-
1) calculate the number of valence electrons in methylene chloride, ch2…
1) 24 2) A. :$\ddot{Cl}$—$\overset{H}{\underset{H}{C}}$—:$\ddot{Cl}$:
-
1) calculate the number of valence electrons in methylene chloride, ch₂…
1. 24 2. A.
-
question 5 of 10 you have a graduated cylinder that you use to measure …
D. 35.5 ml
-
question 3 of 10 a student measured the density of gold to be 18.5 g/cm…
B. 4.15%
-
substance normal 1000x 10,000,000x classification (check all that apply…
mixture, solution, homogeneous mixture
-
the severe secondary osteoarthritis that follows aseptic necrosis of th…
collapse of underlying subchondral bone
-
the descriptions below of two substances and an experiment on each. dec…
Is sample A made from a pure substance or a mixture? mixture Is sample B made from a pure substance or a mixture? mixture
-
read the descriptions below of two substances and an experiment on each…
Is sample A made from a pure substance or a mixture? mixture Is sample B made from a pure substance or a mixture? mixture
-
distinguishing mixtures from pure substances through physical propertie…
Is sample A made from a pure substance or a mixture? pure substance Is sample B made from a pure substance or a mixture? mixture
-
distinguishing mixtures from pure substances through physical propertie…
Is sample A made from a pure substance or a mixture? mixture Is sample B made from a pure substance or a mixture? mixture
-
read the descriptions below of two substances and an experiment on each…
Is sample A made from a pure substance or a mixture? (can't decide) Is sample B made from a pure substance or a mixture? mixture
-
distinguishing mixtures from pure substances through physical propertie…
Is sample A made from a pure substance or a mixture? mixture Is sample B made from a pure substance or a mixture? mixture
-
general chemistry i aleks - session closed aleks - cristabel cortez - l…
Is sample A made from a pure substance or a mixture? - mixture Is sample B made from a pure substance or a mixture? - mixture
-
an ebony carving has a mass of 273 g and a volume of 207 cm³. express y…
Density of tin: $7.27\ g/cm^{3}$; Density of ebony: $1.32\ g/cm^{3}$
-
incorrect your answer is incorrect. list these electron subshells in or…
5p, 6s, 4f, 6p
-
some patterns of electron configuration are listed below. in each case,…
| electron configuration of atoms | location of elements (blocks) | metals or nonmetals? | | ---- | ---- | ---- | | [G]$ns^{2}md^{10}np^{2}$ | p | nonmetals, metalloids | | [G]$ns…
-
consider the following data for iodine: | atomic mass | $126.90\frac{g}…
1. absorb 2. yes 3. \(1008.4\) 4. release 5. yes 6. \(1008.4\)
-
consider the following data for nickel: | | | |--|--| | atomic mass | 5…
(1) absorb, yes, $112$ (2) release, yes, $112$
-
section 4.3 how atoms differ in your textbook, read about atomic number…
1. False 2. False 3. False 4. True 5. False
-
while mechanical solidarity occurs when people tend to do the same type…
is a social order based around an acceptance of economic and social differences
-
according to emile durkheims theory of organic solidarity arises out of…
A. arises out of the mutual interdependence created by the specialization of work, allowing for diversity of values
-
can cause temporary changes in which of the following? speech balance b…
transient ischemic attack
-
question 16 of 20 which term refers to the energy an object has due to …
D. Chemical energy
-
question 13 of 20 which process is a change from liquid to gas? a. melt…
D. Vaporization
-
question 12 of 20 which best describes nuclear energy? a. the energy th…
B. The energy stored inside the center of an atom
-
1/19 rhyme scheme 1 the attitude the poems narrator (this may or may no…
The pattern of rhymes within a poem. It is labeled with the letters of the alphabet.
-
a star is mainly made of hydrogen gas, but most classes of stars includ…
True
-
complete the sentence with the pronoun that agrees with the word or wor…
her
-
nick hypothesizes that wax has a higher melting point than chocolate. h…
A. Heat equal masses of wax and chocolate and measure their temperatures when they start to melt.
-
read the passage from \the lady, or the tiger.\ it mattered not that he…
the wisdom of a good leader
-
question 4 of 10 read these lines from emily dickinsons poem 324 (some …
A. aabb
-
question 2 of 10 read these lines from emily dickinsons poem \24 (some …
A. abbc
-
4.) there are ____ moles in 9.01 x 10^23 molecules of water. (1 point) …
A. 1.50
-
10.2 conversions between moles and atoms 1.) what is the mass of 5.119 …
1. D. 135.7 g 2. C. 1.31 mol Fe 3. B. 0.166 mol
-
atomic symbols a is the mass number: total number of protons + neutrons…
1. **For the isotope table**: - For the first row with \(p^{+}=6\) and \(n^{0}=6\), the mass number \(A=p^{+}+n^{0}=6 + 6=12\), and the symbol is \(\ce{^{12}_6C}\) - For the secon…
-
osha 10 hour construction: module 11 - health hazards in construction e…
D. Both a and b
-
osha 10 hour construction: module 11 - health hazards in construction e…
B. Safety Data Sheets (SDSs)
-
question 1 of 10 oshas hazard communication standard (hazcom) is design…
C. Hazardous chemicals
-
verification de tes hypotheses 1 retourne à lexploration de la page 4 e…
1. Un atome est la plus petite partie d'un élément avec ses propriétés, une molécule est formée de plusieurs atomes. 2. Nombre atomique, masse atomique, propriétés chimiques et ph…
-
5 referring to figure 1, notice that water shows capillary attraction, …
Mercury has weak adhesion to glass and strong cohesive forces among its own molecules, while water has strong adhesion to glass, which leads to different meniscus shapes.
-
maximum protection from on - the - job noise is provided by _____. * ea…
1. C. earplugs used with earmuffs 2. B. measure the concentration of hazardous chemicals
-
6 observe limage ci - dessous. quelle est la masse de loxygène? 7 compl…
## Question 6 La masse de l'oxygène est égale à la masse de 16 atomes d'hydrogène. ## Question 7 éléments, atomes, numéro atomique, masse atomique, carbone ## Question 8 ### a) FA…
-
workers should know where a shower is located in case they are splas wi…
1. True 2. move to a cool area
-
1. lequel de ces énoncés est vrai? coche la bonne réponse. a. la masse …
B. Le tableau périodique évolue au fil des découvertes scientifiques. 2.
-
matter can exist in several different forms which are called solids liq…
phases
-
1. lequel de ces énoncés est vrai? coche la bonne réponse. a. la masse …
A. La masse atomique est la mesure de la taille d'un atome. 2.
-
which would make water impure? adding chemicals adding ice
adding chemicals
-
which is a nonchemical method for cleaning a floor? using a mop and ble…
using a broom and dustpan
-
4. lesquels de ces énoncés sappliquent au modèle atomique de dalton? co…
A. Le corps humain est composé de divers atomes. D. Dalton a pu élaborer son modèle atomique sans avoir vu un atome. E. Selon le modèle de Dalton, les atomes sont indivisibles. F.…
-
03 pratique 1 vrai ou faux? lorsquun énoncé est faux, corrige - le. a) …
a) Faux b) Faux c) Vrai 2.
-
1. why do isotopes of the same element have different masses? 2. what w…
1. Isotopes of the same element have different masses because they have different numbers of neutrons. 2. Cannot be answered without more data. 3. Approximately 39.56% 4. Closer t…
-
draw the correct lewis structure of scl₂. be sure to include all lone p…
The Lewis structure has a sulfur atom in the center, single - bonded to two chlorine atoms. Each chlorine atom has 3 lone - pairs of electrons and the sulfur atom has 2 lone - pai…
-
identify the correct lewis structure for ch₃cho. select the single best…
The first structure (with the carbon - carbon single bond, carbon - oxygen double bond and appropriate hydrogen atoms and lone pairs on oxygen).
-
the graph shows that as the temperature of the water increases, the tim…
Making tea/coffee (using hot water to dissolve sugar faster); Cleaning greasy dishes (hot water dissolves grease faster)
-
identify the correct lewis structure for nf₃. select the single best an…
The first structure (where N is single - bonded to three F atoms and each atom has its full complement of lone - pairs) is the correct Lewis structure for NF₃.
-
a dietician asks a patient about the food that the patient eats and mak…
The patient should decrease the amount of rice and pasta and increase the amount of oils in his or her diet.
-
question time! when a molecule has more than one interior atom, _____. …
more than one geometry may be used to describe the molecule
-
the goal of the vsepr model is to arrange the position of the atoms and…
C. repulsion
-
question time! __________ atoms always obey the octet rule. o oxygen, c…
Oxygen, fluorine, nitrogen, carbon
-
question time! the octet rule is based upon the observation that atoms …
D. 8
-
an example of an atom with 3 valence electrons is _____. ○ sodium ○ mag…
C. aluminum
-
allotropes are _. ○ molecules bonded through the sharing of valence ele…
B. different structural modifications of an element
-
figure 1. allotropes of the element carbon. a. crystalline structure of…
A. sharing of valence electron pairs
-
determine the correct molecular geometry based on the number of bonds a…
| Bonds | Lone pairs | Geometry | | ---- | ---- | ---- | | 2 | 2 | Bent | | 3 | 0 | Trigonal planar | | 3 | 1 | Trigonal pyramidal | | 4 | 0 | Tetrahedral |
-
one piece of evidence for the daltons atomic theory is the observation …
D. a compound always has the same proportions of different elements.
-
which theory includes that all elements consist of tiny particles that …
A. atomic theory
-
select the correct term to complete each statement. - allotropes - duet…
1. VSEPR 2. duet 3. allotropes 4. structures 5. electron deficient 6. valence electrons
-
match the number of valence electrons with the correct compound. ch₄ pb…
CH₄: 8 PBr₃: 26 OF₂: 20 CH₂O: 12 O₃: 18 SiCl₄: 32
-
question 9 6 pts which of the following is a nonpolar molecule? o h2s o…
Question 9: B. $CO_2$ Question 10: A. $CH_4$
-
question 7 6 pts a nonpolar covalent bond will form between which two a…
- Question 7: chlorine and chlorine - Question 8: increases.
-
question 5 6 pts in any period, the highest electronegativity is found …
Question 5: nonmetal Question 6: hydrogen and chlorine
-
question 3 6 pts co is called monocarbon monoxide carbon oxide carbon m…
Question 3: carbon monoxide Question 4: nonpolar covalent
-
question 1 6 pts the prefix \hepta\ means six. true false question 2 6 …
Question 1: B. False Question 2: A. N₂O
-
for the reaction 3a + 4b → 2c + d, what is the magnitude of the rate of…
\(3.2\ M/min\)
-
for the reaction 2a + 3b → 4d + 5e, how is the rate of reaction express…
A. \(\frac{\Delta[B]}{\Delta t}\) is incorrect because the rate of disappearance of B has a negative sign. B. \(-\frac{\Delta[B]}{\Delta t}\) represents the rate of disappearance …
-
which small molecule neurotransmitter is in a class all by itself? mono…
Question 20: D. acetylcholine Question 21: C. catecholamines, E. indolamines
-
12. refer to the hydrogen isotopes in model 1. each isotope has a speci…
12. The names refer to the number of neutrons in the atom. 13. No. Isotopes are of the same element with different neutron numbers. If mass numbers are the same and they are the s…
-
what is the one class of large molecule neurotransmitters? acetylcholin…
B. neuropeptides
-
draw the lewis structure for n₂br₂ molecule. be sure to include all lon…
The Lewis structure has two N atoms in the middle with a single bond between them. Each N is single - bonded to a Br atom. Each Br has 3 lone - pairs of electrons and each N has 1…
-
arrange the following bonds in order of decreasing ionic character: mg …
Li - N, Mg - N, Si - C
-
four atoms are arbitrarily labeled d, e, f, and g. their electronegativ…
DG < EG < DF < DE
-
arrange the following bonds in order of increasing ionic character: pot…
nitrogen to chlorine, bromine to hydrogen, sodium to chlorine, potassium to oxygen
-
list the following bonds in order of decreasing ionic character: the li…
Li - F > Na - I > P - Cl > H - S
-
for the elements rb and br, please indicate whether the binary compound…
Ionic; RbBr; Rubidium bromide
-
extension questions 11. determine the number of electrons in each of th…
a. The number of electrons is equal to the number of protons in a neutral atom. b. It is important because it ensures the atom has a net charge of zero, making it electrically neu…
-
art-111-z191 2025fa - art appreciation / module 5 september 15 - 21 / c…
A. All of the above
-
art-111-z191 2025fa - art appreciation / module 5: september 15 - 21 / …
e. patina
-
draw the lewis dot symbol for as.
As with 2 dots on one side and 1 dot on each of the other three sides around the symbol.
-
question 10 please match the key word to the correct definition. column…
1. Chemical reaction - g. a process that transforms two different sets of chemicals into a new set of chemicals when they come in contact with one another 2. Endothermic reaction …
-
use the images below to answer the question. the images show a beaker o…
d. Molecules of dye moved by diffusion from a higher concentration to a lower concentration.