Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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what is mass spectrometry primarily used for? measuring the speed of li…
C. Measuring the mass - to - charge ratio of molecules
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what does the highest peak on a mass spectrum represent? the most abund…
The most abundant ion
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what is the result shown as in mass spectrometry? a line graph a mass s…
B. A Mass Spectrum
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what is the first step in mass spectrometry as described in the summary…
Transferring the sample to the gas phase and ionizing it
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what is the purpose of the applied electric field in mass spectrometry?…
To accelerate the ions
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on a mass spectrum, what is displayed on the x - axis? mass to charge r…
Mass to charge ratio
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what are the first two steps in mass spectrometry often separated by? e…
D. Liquid Chromatography
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what is the process called where molecules are transferred into the gas…
B. Ionization
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chantel and a few of her friends have an important chemistry test comin…
She could ask a librarian or security guard to accompany her to her car.
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what are the molecular and empirical chemical formulas of a compound ma…
Molecular formula: $C_{3}H_{8}O_{3}$ Empirical formula: $C_{3}H_{8}O_{3}$
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question 18 of 18 < points possible: 1.00 calculate the rf value for a …
$0.59$
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question 13 (2 points) what is present in human blood that ensures bloo…
A. A buffer [bicarbonate ions ($HCO_3^-$) and carbonic acid ($H_2CO_3$)]
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where art thou, muse, that thou forgetst so long to speak of that which…
A. The rhyme scheme is abab cdcd efef gg. E. The regular rhyme scheme makes the sonnet sound musical and memorable.
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suppose you are performing an acid/base extraction. after one of the st…
The product of the addition of \(HCl\) to the phenolate - containing layer is the neutral phenol compound (the third - option structure with an \(OH\) group on the aromatic ring).…
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determine which base will work to deprotonate each compound in an acid/…
Hydroxide or bicarbonate ## Step3: Analyze the second compound (phenol - like) Phenols ($pK_a \approx 10$) can be deprotonated by hydroxide but not by bicarbonate because bicarbon…
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determine which base will work to deprotonate each compound in an acid/…
1. Sodium bicarbonate ($\mathrm{NaHCO_3}$) 2. Sodium hydroxide ($\mathrm{NaOH}$) 3. Sodium hydride ($\mathrm{NaH}$)
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determine which base will work to deprotonate each compound in an acid/…
For the first compound (carboxylic - acid containing): Sodium bicarbonate ($\mathrm{NaHCO_3}$) For the second compound (phenol - containing): Sodium hydroxide ($\mathrm{NaOH}$) Fo…
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multiple - choice question which is an example of an unsaturated fatty …
olive oil
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e active element takes the place of sis reaction. position reactions ar…
a) Hydrotelluric acid b) Phosphoric acid c) $HNO_3$ d) $H_3P$
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nonpolar means electrons are shared equally within the molecule electro…
electrons are shared equally within the molecule
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which of these is a heterogeneous mixture? oil and water salt gold
oil and water
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what type of mixture is trail mix? heterogeneous solution homogeneous
heterogeneous
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lipids are composed mainly of... (select all that apply) hydrogen carbo…
Hydrogen, Carbon, Oxygen
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what type of mixture is composed of different molecules that are evenly…
C. homogeneous
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which of the following is a heterogenous mixture? ice cream sundae whit…
ice cream sundae
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which of the following shows an example of a heterogeneous mixture?
The image of the collection of different colored berries.
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is this ice cream sundae a homogeneous or heterogeneous mixture? hetero…
heterogeneous
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cannot be separated by acid or base extraction choose... cannot be sepa…
First pair: Cannot be separated by acid or base extraction Second pair: Can be separated by a base extraction Third pair: Can be separated by a base extraction
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is this cookie a homogeneous or heterogeneous mixture? homogeneous hete…
heterogeneous
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is air a homogeneous or heterogeneous mixture? heterogeneous homogeneous
homogeneous
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is this mixture of stones homogeneous or heterogeneous?
heterogeneous
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cannot be separated by acid or base extraction choose... choose...
The pair of a methyl - substituted benzene and an aldehyde cannot be separated by acid - base extraction.
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determine whether each pair of chemicals could be separated by an acid …
1. Can be separated by an acid extraction 2. Cannot be separated by acid or base extraction 3. Cannot be separated by acid or base extraction
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the birdseed in this image is a mixture of several different types and …
heterogeneous
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when a mixture is created, are new molecules formed? yes no
B. no
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what is a mixture? two or more substances combined when a chemical reac…
two or more substances combined
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write the systematic name of each organic molecule: | structure | name …
propanal
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hemiacetal acetal neither hemiacetal acetal neither
1. hemiacetal 2. acetal
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bromine is the only nonmetal that is a liquid at room temperature. cons…
35, 46, 81
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determine whether each of the following molecules is a hemiacetal, acet…
1. acetal 2. neither
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ho—ch—o—ch3 ch3 hemiacetal acetal neither ch3—ch2—o—ch—och3 ch3 hemiace…
1. hemiacetal 2. acetal
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question 7 of 18 < points possible: 1.00 suppose you are going to perfo…
Filter paper, Beaker
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question 17 of 22 (1 point) | question attempt: 2 of unlimited
First structure: hemiacetal Second structure: neither
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q1 chemistry: u2l5 prework part 1: periodic table practice 1. **label t…
c. 1 d. 5 e. 8 f. They have a full outer - shell of electrons, giving them a stable electron configuration. g. Alkali metals (Group 1)
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refer to explorations in literature for a complete version of the poem.…
The rhythm and rhyme scheme underscore the speaker's deep love of the subject.
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refer to explorations in literature for a complete version of the poem.…
By organizing the poem into three short and even stanzas, Byron is able to convey the work's themes directly and succinctly.
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how would you classify the black powder? element compound heterogeneous…
B. heterogeneous mixture
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a student is eating cereal with milk for breakfast and considering the …
Cereal and milk form a heterogeneous mixture.
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question 6 of 18 points possible: 1.00 when using a separatory funnel, …
Opening the stopcock when the flask is inverted during mixing
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question 5 of 18 < points possible: 1.00 two compounds might have spots…
Repeat the original experiment with a different solvent system
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a student is testing the chemical makeup of a penny. after a few minute…
A. A penny is a mixture of two metals that were separated by chemical means.
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the chemical formula for the oxygen that we breathe in is o₂. why is o₂…
It cannot be broken down into smaller subunits.
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which of the following describes why boiling water is a physical change…
When you apply heat to water, it becomes steam, which is not a new substance with a different chemical makeup.
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which of the following statements regarding sarahs baking experience is…
B. Baking a cake is a chemical change, while mixing dry ingredients is a physical change.
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question 4 of 18 < points possible: 1.00 identify the effect of each er…
Using pen rather than pencil: There will be smears on the TLC plate. The TLC plate remains in the chamber: Accurate Rf values cannot be determined. The solvent line is not marked:…
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part 2 (1 point) are any of the bonds formed between the following pair…
Ca and Cl
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a student makes a giant pitcher of kool - aid by mixing half a cup of k…
It will taste the same as the larger sample because concentration is an intensive property. It does not depend on the amount that she tastes.
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part 1 (1 point) which of the following forms the most polar bond? choo…
B. H and F
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which of the following is an extensive property? o volume o density o m…
O volume
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question 3 of 18 < points possible: 1.00 identify the chromatography te…
A method used to separate components of a mixture: Chromatography The substance to which the sample is bound at the start of an experiment: Stationary phase The substance that car…
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a child creates a snow man out of two balls of modelling clay. both par…
D. density; intensive, mass; extensive
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what are physical properties? each of the balls in the figure below is …
# Explicación breve: Los atributos observables de los objetos en la imagen son los que se pueden identificar sin alterar su naturaleza química. El tenis - pelota pequeña y elástic…
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before adding a sample or solvent to a separatory funnel, what should y…
A. A flask under the separatory funnel B. A stopcock in the closed position E. A stopper in the top of the separatory funnel
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select the correct answer. what is a substance? a. a uniform mixture th…
C. a single component that can't be separated
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rank the following elements in order of increasing electronegativity. q…
1. K 2. Cr 3. As 4. Br
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the chemical equation for the reaction of sodium metal with water is 2n…
C. 31 g
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select the correct answer. erica is working in the lab. she wants to re…
C. filtration
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what is the change of state in which a gas becomes a liquid? a) freezin…
B. condensation
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which is an example of a physical change? a) the corrosion of a copper …
C. magnetizing an iron bar
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select the correct answer from each drop - down menu. william finds a p…
Iron is an element. Rust is a compound.
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what occurs during a chemical change? a) electricity passes through a s…
D. A new substance with different physical properties is produced
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reading toolbox underline as you read, use a red pen or colored pencil …
No se puede responder sin la imagen para observar. Sin embargo, ejemplos de propiedades de objetos que se pueden observar son la forma (redonda, rectangular), el color (rojo, azul…
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sa 3 writing chemical formulas write the chemical formulas for the foll…
1. $NaH$ 2. $Ga(H S)_3$ 3. $K_3As$ 4. $Au_2CO_3$ 5. $KrBr_6$ 6. $Mn_3N_2$ 7. $HgS$ 8. $Zn_3P_2$ 9. $Ni_3(BO_3)_2$ 10. $(NH_4)_2C_2O_4$ 11. $TiC$ 12. $Ba_3As_2$ 13. $SnI_2$ 14. $N_…
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a chemistry teacher is preparing a diluted acidic solution. to do this …
Take a beaker with water and slowly add the acid while wearing goggles.
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drag each label to the correct location. sort the sentences based on wh…
Homogeneous Mixture: It may be mistaken for a pure substance., It can be separated using distillation. Heterogeneous Mixture: Its components are visible., Concrete is an example o…
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50 ml of vinegar and 2 g of baking soda are added to flask. the flask i…
C. 52 g
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define the term electronegativity. choose one: a. a negatively charged …
C. A relative measure of the ability of an atom to attract electrons in a bond to itself
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sa 3 writing chemical formulas write the chemical formulas for the foll…
1. $NaH$ 2. $Ga(HS)_3$ 3. $K_3As$ 4. $Au_2CO_3$ 5. $KrBr_6$ 6. $Mn_3N_2$ 7. $HgS$ 8. $Zn_3P_2$ 9. $Ni_3(BO_3)_2$ 10. $(NH_4)_2C_2O_4$ 11. $TiC$ 12. $Ba_3As_2$ 17. $As_4S_3$ 18. $T…
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question 11 why is the vapor pressure of a solution lower than the vapo…
B. because fewer solvent molecules are present on the surface
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why is the vapor pressure of a solution lower than the vapor pressure o…
B. because fewer solvent molecules are present on the surface ### Question 2: Which of the following solutions has the highest boiling point?
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which of the following statements correctly describes the chemical acco…
This chemical is highly flammable at room temperature.
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determine whether charcoal burning is a physical change or a chemical c…
Charcoal burning is a chemical change because new substances like carbon - dioxide are formed during the burning process as a result of a chemical reaction with oxygen.
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determine whether an icicle melting is a physical change or a chemical …
An icicle melting is a physical change. The basis is that no new substances are formed; it is just a change from solid ice to liquid water with the same chemical composition (H₂O).
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reading toolbox underline as you read, use a red pen or colored pencil …
1. Color, forma, textura. 2. Su composición química y estructura molecular.
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which is not a chemical change? a) stirring ingredients together in a s…
A. Stirring ingredients together in a salad
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which is an example of a chemical change? a) sublimation b) electrical …
D. combustion
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of what use is it to find the rate law for a reaction? a from the rate …
C. The rate law gives us a good indication of the reaction mechanisms.
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atomic structure worksheet 2 the atomic number of an element is the num…
| Name of Element | Symbol of Element | Atomic Number | Mass Number | Number of Protons | Number of Neutrons | Number of electrons | |-----------------|-------------------|-------…
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consider the reaction x → y + z. which of the following is a possible r…
D. rate \(=k[X]\)
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exam content page 1 of 5 question 1 how is a rate law determined? a usi…
B. using experimental data
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8. if you know only the following information can you always determine …
a. Yes b. No c. Yes d. No | Symbol | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons | |----------|---------------|-------------|-------…
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when molecules such as water and carbon dioxide undergo a chemical reac…
less ... used
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select the correct answer from each drop - down menu. complete the sent…
1. homogeneous 2. filtration 3. distillation 4. reverse - osmosis 5. heterogeneous 6. filtration
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scientists sometimes want to show whether more energy is used or releas…
$6CO_2 + 6H_2O+ \text{light energy} ightarrow C_6H_{12}O_6 + 6O_2$
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if the reason explains why some elements have large exothermic electron…
- EA < 0: Addition of one electron will create an anion with a noble gas electron configuration; The additional electron added will occupy an outer - shell p orbital. This degener…
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in a chemical process, the atoms in the reactants are arranged differen…
broken; formed
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part 3: what element am i? write the element name & symbol described by…
1. Lithium, Li 2. Magnesium, Mg 3. Lead, Pb 4. Sulfur, S 5. Titanium, Ti 6. Zirconium, Zr 7. Hydrogen, H 8. Iron, Fe 9. Silver, Ag 10. Bromine, Br 11. Plutonium, Pu 12. Copper, Cu…
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chemical bonds carbon dioxide water a carbon atom connected to another …
- A carbon atom connected to an oxygen atom: Present in carbon dioxide and water. - An oxygen atom connected to a hydrogen atom: Present in water. - How do carbon dioxide, water, …
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in a chemical process such as photosynthesis, the reactants and product…
| Chemical bonds | Carbon dioxide | Water | Glucose | Oxygen | | ---- | ---- | ---- | ---- | ---- | | a carbon atom connected to another carbon atom | | | √ | | | an oxygen atom c…
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what is the smallest part of an element that still has all the characte…
A. Atom