化学
化学反応、化学量論、分子構造、元素の性質。
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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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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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is this mixture of stones homogeneous or heterogeneous?
heterogeneous
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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
2,5 - dihydroxypentanal
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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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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
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12 when 14 grams of iron combines with 8 grams of sulfur, 22 grams of i…
Law of Conservation of Matter
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11 physical changes in matter are changes that result in a new substanc…
False
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10 the law of conservation of matter states that atoms are in a chemica…
D. rearranged
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9 sublimation is the process that changes a _. gas to liquid liquid to …
D. solid to gas
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4 color is an example of what type of physical property of matter? exot…
B. Intensive
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3 the more intensive properties known about a substance, the harder it …
False
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3. look at the second word in the compounds name and identify the eleme…
1. \(B_4C\) 2. \(CP\) 3. \(N_2S\) 4. \(O_4F_2\) 5. \(Cl_2O\) 6. \(ArO_6\) 7. \(H_2O\) 8. \(XeF_4\) 9. \(Te_2F_{10}\) 10. \(Si_3P_4\)
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drag the correct labels to the images. each label can be used more than…
Rock: heterogeneous mixture Clear liquids: substance or homogeneous mixture Peppercorns: heterogeneous mixture Concrete: heterogeneous mixture Salt: substance Oxygen: substance Bi…
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1 what is the term for physical properties of matter that are dependent…
C. Extensive
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what is the name of the compound c4n3? tetracyanide trinitride carbon t…
C. tetracarbon trinitride
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what is the name of the compound cs2? carbon disulfide carbon disodium …
carbon disulfide
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what is the name of the compound p2o5? pentaphosphorus dioxide diphosph…
B. diphosphorus pentoxide
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which element will form a covalent bond with fluorine, f? oxygen, o cal…
oxygen, O
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which element will form a covalent bond with oxygen, o? nitrogen, n pot…
nitrogen, N
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cfa - atoms, periodic table, and ions. all elements in a column have: s…
E. both the same number of valence electrons and characteristics and properties
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which element will form a covalent bond with hydrogen, h? beryllium, be…
oxygen, O
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a neutral isotope has - the same number of protons, neutrons and electr…
The same number of protons and electrons, but different numbers of neutrons
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an atom has 17 protons, 18 neutrons and 18 electrons. it is most likely…
Cl
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this means that it takes two - iron (iii) ions (total charge 6+) to bal…
1. $Sb(ClO_{3})_{3}$ 2. $Ta_{2}(SO_{3})_{5}$ 3. $Mn(AsO_{2})_{2}$ 4. $Re(ClO_{4})_{6}$ 5. $Fe_{2}(SO_{4})_{3}$ 6. $Co_{3}(AsO_{4})_{2}$ 7. $Pt_{3}(BO_{3})_{4}$ 8. $CuC_{2}O_{4}$ 9…
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cfa - atoms, periodic table,and ions identify the number of neutrons in…
C. 8
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cfa - atoms, periodic table, and ions identify the number of protons in…
C. 25
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which of the following describes how elements are arranged in the perio…
Atomic number
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7. write the chemical formula. you do not need to include the charges o…
1. $Ca(NO_{2})_{2}$ 2. $K_{2}CO_{3}$ 3. $Ag_{3}C_{6}H_{5}O_{7}$ 4. $AlAsO_{4}$ 5. $CdSO_{3}$ 6. $Rb_{3}PO_{3}$ 7. $Sr(OH)_{2}$ 8. $BeSO_{4}$ 9. $Zn(HSO_{4})_{2}$ 10. $KClO_{4}$
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based on the positions of sodium (na) and potassium (k) in the table, t…
C. has many of the same properties as potassium.