Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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samantha and her team are looking for ways to improve the results of th…
A. Create a social voice and tone guide.
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hair loss is a side effect of which of the following types of cancer tr…
D. chemotherapy and radiation
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in your own words, describe how matter is identified.
Matter is identified by its physical properties (e.g., color, density, melting - point) and chemical properties (e.g., reactivity with other substances).
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treats cancer by removing it. please select the best answer from the ch…
C. Surgery
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5. sep analyze data classify electron dot structures for molecules with…
H₂CO: trigonal planar SO₂: bent CH₃F: tetraédrica NH₃: trigonal piramidal BeF₂: lineal
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choose the statement below that is not true about early earth’s atmosph…
The ozone layer was quite thick.
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level 2 q3 what is the tendency of a substance to undergo a chemical re…
B. Reactivity
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which of the following is an example of an effort to address urban spra…
A small city maintains a park and forest within its downtown as new businesses build around it.
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level 2 q3 what is the tendency of a substance to undergo a chemical re…
B. Reactivity
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2. sep construct explanations describe and explain one factor that you …
# Explicación breve: Estos compuestos son compuestos moleculares. No se disocian en iones en agua. Los iones son necesarios para la conducción de electricidad en disolución. Sin d…
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what is the ability of a substance to change into something else? a che…
A. Chemical property
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level 1. q3 what is the measure of the amount of matter in a substance …
D. Mass
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what is the ability of a substance to burn or ignite, causing fire or c…
C. Flammability
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question # 5 multiple choice which of these is not a part of the art di…
hiring actors for a television commercial
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physical properties can be observed and measured without changing the s…
D. All of the above
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colonel killigrew enjoyed the sensual pleasures of life torments of sou…
7. Dr. Heidegger reminds his guests to use the water of youth with moderation and remember the lessons of their past lives. 8. Widow Mycherly: Vanity; Mr. Gascoigne: Political Amb…
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bean bag (bg) average atomic mass (amu) atomic mass = (avg.mass$_{isoto…
It depends on experimental errors, sample consistency, and calculation accuracy. If errors are low and samples are similar, values will be close; if not, they could be very differ…
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alisha organizes her data about the element lead into a table. |quantit…
Solid at room temperature
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3. sep calculate the percent abundance of each isotope: divide the numb…
Limium Relative Abundance: 0.47951 Kidnium Relative Abundance: 0.2235 Peaium Relative Abundance: 0.1415 Navium Relative Abundance: 0.135
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highlight the piece of evidence that best supports the claim. claim: at…
There are also just as many electrolytes, electrically charged chemicals that help muscles function, in chocolate milk as there are in popular sports drinks like Gatorade and Powe…
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bena thinks that dissolving more salt in water causes the mixtures free…
an experimental investigation, because it allows for the control of variables
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write a paragraph comparing and contrasting how the poets use topic, rh…
(Paragraph -) Poem A focuses on the beauty of a sunset as its topic, using an ABAB rhyme scheme that gives it a smooth, flowing rhythm. The poet uses metaphors like "the sun is a …
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3. titanium has five common isotopes with the 8.0% ti - 46, 7.8% ti - 4…
$47.923$
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atoms and elements name royal grade 8th 1.draw and label two atom model…
1. Hydrogen atom model: A small nucleus with 1 proton (marked as 'p') and no neutrons (or can mark 0 if preferred). One electron (marked as 'e') in the first electron - shell. Car…
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read the passage about the health risks of single - load liquid laundry…
Studies performed by the CPSC give reliability to the results of improved safety obtained by each soap company.
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question 10 (10 points) listen what is the structure of 1 - chloro - 3 …
The correct structure is the one where there is a 7 - carbon chain with a C=O at the second carbon, a $-Cl$ at the first carbon and an ethyl group ($-CH_2CH_3$) at the third carbo…
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what products are formed when the acetal below is hydrolyzed with water…
The first option: $\ce{H - C(=O)-CH_2CH_2CH_2CH_3 + 2CH_3OH}$
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10) put a checkmark next to the description if it describes an element,…
It has one chemical symbol: Element Its chemical formula can include different chemical symbols: Compound It is made of bonded atoms: Compound It is considered a pure substance: B…
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what product is formed when the compound below is oxidized with k₂cr₂o₇…
The second option: $\mathrm{CH_3CH(CH_3)CH(Br)COOH}$
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10) put a checkmark next to the description if it describes an element,…
It has one chemical symbol: Element Its chemical formula can include different chemical symbols: Compound It is made of bonded atoms: Compound It is considered a pure substance: B…
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2) match the elements with the groups. krypton rubidium titanium silicon
Krypton - Group 18 Rubidium - Group 1 Titanium - Group 4 Silicon - Group 14
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3) match the atomic numbers with the elements. 2 16 27 56
2 - Helium 16 - Sulfur 27 - Cobalt 56 - Barium
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2) match the elements with the groups. krypton rubidium titanium silicon
Krypton - Group 18 Rubidium - Group 1 Titanium - Group 4 Silicon - Group 14
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1) use the periodic table to match the symbols with the elements. ag cr…
Ag - Silver Cr - Chromium Cu - Copper Hg - Mercury Mo - Molybdenum
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which two descriptions complete the venn - diagram that compares and co…
contains hydrogen, contains oxygen
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which three elements are in na₃po₄? phosphorus osmium oxygen palladium …
phosphorus, oxygen, sodium
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which three elements are in koh? krypton oxygen arsenic halfnium potass…
B. oxygen, E. potassium, G. hydrogen
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6) choose the best answer. how many oxygen atoms are in h₂o (water)? 2 …
6) D. 1 7) B. $NaOH$
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what do you think would happen if you had a very small amount of water …
Not all the salt would dissolve. There is insufficient water to dissolve a large - volume of salt as the solubility limit would be reached rapidly.
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4) choose the best answer. which element is not in the chemical formula…
4) C. iron 5) C. 4
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capacity, duration and speed no one knows how long information can last…
How long does memory last? Indefinite in long - term memory. How much memory can our brains store? Practically infinite in long - term memory. What is encoding? The process of tra…
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activation energy represents: total energy of a reaction enzyme energy …
Energy required to start a reaction
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what is the acetal formed in the reaction below, if two equivalents of …
The third structure (from the top) where the central carbon has two $O - CH_2 - CH_2 - CH_3$ groups and is also bonded to $H_3C - CH_2$ and $CH_3$ groups.
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question 5 (10 points) listen which compound is a hemiacetal?
The second - structure $\text{CH}_3\text{CH}_2-\underset{\text{CH}_3}{\underset{|}{\text{C}}}-\text{OH}-\text{OCH}_2\text{CH}_2\text{CH}_3$ is a hemiacetal as it has a carbon atom…
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describe the final conditions. the tubing contains starch solution and …
starch solution and Lugol's solution
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an exergonic reaction has a δg that is: zero positive negative undefined
C. Negative
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describe the initial conditions. the tubing contains starch solution an…
Lugol's solution
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the chemical digestion occurs mainly in the ____. a large intestine b m…
d. Small intestine
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counting atoms worksheet directions for each problem: 1) recognize and …
1. $H_2O$: 3 atoms 2. $MgCl_2$: 3 atoms 3. $Li_2SO_4$: 7 atoms 4. $NaC_2H_3O_2$: 8 atoms 5. $NH_4Cl$: 6 atoms 6. $HBr$: 2 atoms 7. $4HNO_3$: 20 atoms 8. $4Li_2O$: 12 atoms 9. $3H_…
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view policies current attempt in progress if a calorimeter has a heat c…
$q_{calorimeter}=3.9\ kJ,q_{chemicals}=-3.9\ kJ$ (the last option)
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the diagram illustrates part of the carbon cycle. which best describes …
A consumer is obtaining carbon by eating carbon - based molecules stored in a producer.
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what is the structure of 2 - ethyl - 4 - methyloctanal? ch₂ch₃ ch₃ch₂ch…
The first structure ( $CH_3CH_2CH_2CH(CH_3)CH_2CH(CH_2CH_3)CHO$) accurately represents 2 - ethyl - 4 - methyloctanal.
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4.6 shapes of atomic orbitals an orbital becomes smaller as the nuclear…
increases
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5. sep synthesize information based on the evaluations of your own mode…
Idea 1: Add details about neutron - proton ratios. Idea 2: Incorporate information about relative abundances of isotopes.
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which of the following is the product of the reduction of acetone, show…
$CH_3 - CH(OH)-CH_3$ (the second option in the list)
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4.5 quantization and quantum numbers which of the following orbitals is…
4d
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4.5 quantization and quantum numbers which of the following sets of qua…
C. \(n = 3\), \(l = 1\), \(m_l=-1\), \(m_s=+\frac{1}{2}\)
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entropy represents: molecular order energy creation chemical stability …
Molecular disorder
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dopamine is a ______________. * neurotransmitter in the brain chemical …
A. neurotransmitter in the brain
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2. sep use models how can you use your model to discuss the similaritie…
A model like the Bohr model or quantum - mechanical model can be used to show that neon isotopes have the same number of protons and electrons (similarity) and different numbers o…
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5.challenge: can two atoms have the same atomic number but different ne…
Yes, they are called isotopes.
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6) fill in the number of atoms for each chemical formula. c₁₂h₂₂o₁₁ co₂…
$C_{12}H_{22}O_{11}$: 45 atoms $CO_{2}$: 3 atoms $NaC_{3}H_{3}O_{2}$: 9 atoms
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7) choose the best answer. the ____ uses colored balls and sticks to sh…
7. ball-and-stick model 8. space-filling model
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5. apply concepts two chemists each plan an investigation in which they…
Yes, the investigations can reach similar conclusions about the reactivity of hydrogen with chlorine because chemical reactivity is an intensive property and does not depend on th…
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given the diagram below, which element is represented? given this diagr…
1s2 2s2 2p6 3s2 3p6 4s2 3d6
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which two important pieces of information are found in a chemical formu…
the number of atoms present in the compound which kinds of atoms are in the compound
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the prefix di- lets you know there are ____ atoms of an element in a fo…
A. 2
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the ____ formula is the combination of chemical symbols and numbers tha…
C. chemical
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a ____ is the electrical force holding atoms tightly in a molecule. bar…
C. bond
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compounds and elements can be molecules. false true
True
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which two elements are combined to create sand? silicon hydrogen oxygen…
silicon, oxygen
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10) choose the best answer using the table. chemical compounds compound…
sugar
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9) choose the best answer using the table. chemical compounds compound …
C. CaO
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choose two facts about organic compounds. organic compounds contain the…
Organic compounds contain the element carbon. Organic compounds are often associated with life.
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____ is an example of an organic compound. hydrogen chloride sulfuric a…
D. Sugar
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3. sep analyze data the properties of matter can be classified into two…
Without the actual table data, specific examples cannot be given. But in general, to identify from a table: Look for properties where the value changes as the amount of matter cha…
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____ is an example of a synthetic compound. plastic carbon dioxide salt…
Plastic
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a ____ compound is made in a laboratory and may or may not include carb…
A. synthetic
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“i’m innocent. i’ve done nothing!” 1999. 2000. 2055. the machine stoppe…
1. PREDICT: No, Eckels will not find that he "done nothing" when he gets back to the future. 2. IDENTIFY: "The same man sat behind the same desk. But the same man did not quite si…
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choose three characteristics of compounds. a compound must include sili…
C. Different elements are chemically combined. D. The atoms in a compound are held tightly together. E. Elements can combine only in certain ways to form compounds.
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compounds and their elements cannot be broken down without ____ releasi…
their properties changing
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elements and compounds are both ____ that have their own unique propert…
pure substances
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a(n) ____ is a chemical combination of atoms. property mark element mol…
D. molecule
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what is the structure of 2 - bromo - 5 - hydroxyheptanal?
The second option: $CH_3CH_2CH(Br)CH_2CH(OH)CH_2CHO$
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what hemiacetal is formed in the reaction below? h₃c—ch₂—c—ch₃ + h₃c—ch…
The second - option (the one with the carbonyl carbon having a $\ce{OH}$ group and an $\ce{O - CH2 - CH2 - CH3}$ group attached to it)
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which compound will give a positive result in a tollens test? more than…
C. The compound with the benzene ring and - CHO group (benzaldehyde)
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5) match the terms with the descriptions. actinides the elements at the…
actinides - the elements at the bottom of the inner transition series that are mostly made in laboratories atomic number - the quantity of protons found in an element periods - el…
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5) match the terms with the descriptions. actinides the elements at the…
actinides - the elements at the bottom of the inner transition series that are mostly made in laboratories atomic number - the quantity of protons found in an element periods - el…
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1. part a: what is the central idea of the text? a. bread is difficult …
C. Bread is made and becomes stale through several chemical reactions.
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3. how are the flour proteins glutenins and gliadins important to makin…
C. They make dough stretchy and soft.
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12) match the elements with the descriptions. these light elements reac…
1. Alkali metals 2. Alkaline - earth metals 3. Halogens 4. Noble gases 5. Radioactive isotopes 6. Semiconductors 7. Transition metals
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identify four characteristics of nonmetals. they react easily with hydr…
They include examples of elements that are molecules. When in a solid state, nonmetals are usually brittle. They include halogens and noble gases. They do not conduct heat very we…
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identify three characteristics of metals. metals can be stretched into …
Metals can be stretched into a long string. Metals can be easily shaped. Metals usually have high conductivity of electricity and heat.
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what are the three major groups of elements? metals nonmetals protoplas…
metals, nonmetals, metalloids
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read the excerpt from the author to her book. \thou ill - formd offspri…
C. A, A, B, B
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____ are stacked in the \in - between\ area of the periodic table becau…
C. Metalloids
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this nonmetal gas that reacts easily with other elements is the only el…
B. hydrogen
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if two elements are listed in the same vertical column, what does this …
They have many properties in common.
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the two bottom rows that are cut off from the periodic table are the __…
D. inner transition
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the purpose of the periodic table is to ____. describe which elements a…
C. group similar elements together