Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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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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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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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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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
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who first arranged the periodic table, and what does this table display…
A. Dmitri Mendeleev, elements and their masses
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4. match the descriptions with the terms. specific types of atoms or mo…
1. Elements 2. Protons 3. Condensation 4. Neutrons 5. Electrons 6. Deposition
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the smallest parts of matter that still contain all the properties of t…
A. atoms
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in which change of state does a solid change to a gas without going to …
C. sublimation
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name julia radar period 7in date 3/22/25 gay - lussacs law computer act…
1. Sin la simulación abierta, no se puede determinar el número de partículas de gas agregadas. No se especifica el tipo de gas agregado. Las partículas se mueven aleatoriamente en…
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4) how long will it take (in seconds) for 45.0g of mg to react with hcl…
1175 s ### 5)
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a can of mixed nuts is an example of a(n) ____ change. chemical environ…
D. physical
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the illustration shows an arrangement of ____ particles in a solid. cry…
crystalline
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which one of these would be considered an investigation? a measuring th…
A. Measuring the pH of common household chemicals, B. Observing the effects of different track surfaces on the speed of a go - cart, C. Investigating the effects of different amou…
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a ____ change results in a substance changing size or shape while remai…
D. physical
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the measure of the damage a substance can cause to an organism through …
A. toxicity
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the only substance that exists naturally in all three forms of matter i…
D. water
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the simplest and most common element in the universe causes the sun to …
A. hydrogen
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____ change results in a new substance and cannot be reversed. physical…
D. Chemical
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burning a wood log is an example of a(n) ____ change. scientific physic…
D. chemical
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1. which of the following statements is true about elements and compoun…
1. D. 2. A. 3. A.
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in the bohr model of the atom, electrons are arranged in fixed orbits c…
a. absorb b. emit c. are at their highest energy level d. are at their lowest energy level
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3. los estados más comunes de la materia en la tierra son sólido, líqui…
- Estado sólido: Fusión (cambio a líquido por calor) y sublimación (cambio directo a gas). - Estado líquido: Evaporación (cambio a gas) y solidificación (cambio a sólido por pérdi…
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1) the above is data for a reaction in which pb is a reactant. a) calcu…
1. a. The overall rate of the Pb - reaction is approximately 0.67 g/s. b. Rate from 0 - 30s is 0.8 g/s and from 30 - 60s is approximately 0.53 g/s. c. The 30 - 60s rate is lower b…
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questions 1. i am a chemical formula that consists of at least two diff…
1. Compound 2. Compound 3. Element 4. Elements: hydrogen (H), oxygen (O); Compounds: water (H₂O), carbon - dioxide (CO₂) 5. No, only elements are on the periodic table.
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find the relative clause. if it is nonrestrictive, set it off with comm…
When adding organic materials to a compost pile, gardeners should avoid animal products and fats in favor of scraps from plants that have not been treated with pesticides.
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2. begin the simulation. as you complete the graphic organizer in the s…
1. Element, Compound, Molecule 2. Element 3. Compound 4. Molecule 5. Element, Compound 6. Element 7. Compound, Molecule 8. Element 9. Compound, Molecule
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given a mixture of pentane and pentane - 1,2,3 - triol, which of the fo…
I. cyclohexane
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use the following information to answer the next question. given the fo…
$2.22$
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use the following information to answer the next question. the reaction…
3.00
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12. determine the chemical amount of silver produced when 118 g of zinc…
3.61 moles
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11. when does a chemical reaction stop? when the excess reactant is use…
D. When the limiting reactant is used up.
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camille set 15 drinking glasses on her countertop. she poured the same …
When sugar is added to water, does the water’s temperature affect the amount of time it takes the sugar to dissolve?
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10. given the reactants, _al₂(so₄)₃(aq) + _pb(s) → predict the unbalanc…
$PbSO_4(aq)+Al(s)$