Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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question 1 of 25 rubidium (rb) has an atomic number of 37. it can lose …
A. 1+
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how have chemists affected our world for good? a. chemists have given u…
B. Chemists have improved our quality of life.
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7. choose the best answer. the center of an atom that contains protons …
C. nucleus
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an engineer chooses to use a natural adhesive for a building project in…
B. green design
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question 19 of 25 what did john dalton state in his atomic theory? a. a…
C. Matter is made up of atoms.
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look at the model. then, choose the best answers. 3. choose the best an…
3. Negative electrons float in a "soup" of positively charged material. 4. J. J. Thomson
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which of the following is an alkali metal? a. krypton (kr) b. lithium (…
B. Lithium (Li)
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how many valence electrons do the alkaline earth metals have? a. 6 b. 8…
D. 2
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question 8 of 10 which of the following would be more reactive than mag…
C. Potassium (K)
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which group has 1 valence electron? a. alkaline earth metals b. transit…
C. Alkali metals
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which of the following is a lanthanide? a. americium (am) b. barium (ba…
C. Europium (Eu)
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question 5 of 10 what is the maximum number of valence electrons an ele…
D. 8
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which of the following is a characteristic of the transition metals? a.…
A. They are malleable
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where are the noble gases located on the periodic table? a. the far lef…
D. The far right column
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question 8 of 25 what made alchemy unscientific in its practices? a. it…
A. It was not based on evidence and experiment.
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which of the following is a characteristic property of the noble gases?…
C. They do not react chemically.
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what is the name of the group 17 elements? a. alkaline earth metals b. …
D. Halogens
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question 10 of 10 nazi scientists frequently tested dangerous chemicals…
C. The Nazi government had dehumanized the Jews by constantly portraying them as subhuman animals.
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what is the periodic table? a. a method to name elements b. a tool to o…
B. A tool to organize the elements
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question 9 of 10 which elements occupy the same group in the periodic t…
B. Elements that share the same column
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question 5 of 25 why does chemical safety remain a concern today? a. ch…
A. Chemists are constantly learning more about what makes chemicals dangerous., C. Chemists still have many older, existing chemicals that are dangerous.
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question 8 of 10 what period is f (fluorine) in? a. 2 b. 17 c. 7b d. 7a
A. 2
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question 7 of 10 what are epresentative elements\? a. elements that sha…
D. Elements in the tall columns of the periodic table
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65. explain the octet rule. why are hydrogen and helium exceptions to t…
65. The octet rule is about 8 - electron outer - shell stability. Hydrogen and helium are exceptions due to their 1 - electron - shell nature and 2 - electron capacity. 66a. Negat…
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which of the following is an example of oxidation, a type of chemical w…
D. rust
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where are people exposed to chemicals? a. mostly outside b. mostly in p…
D. Everywhere
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question 9 of 10 where are chemicals found at work? a. only in carpets …
C. In every area of work
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question 8 of 10 what is a carcinogen? a. a chemical that improves the …
C. A chemical that causes cancer
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question 7 of 10 how do chemicals affect the environment? a. they only …
D. They can both hurt and help the environment.
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question 6 of 10 how does chemistry affect cancer? a. chemicals can bot…
A. Chemicals can both cause and fight cancer.
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question 5 of 10 how have chemists changed our daily lives the most? a.…
D. By using what they know to produce new and helpful products
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question 4 of 10 how does chemistry affect our world? a. chemicals make…
C. Chemicals can help or hurt our world.
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question 3 of 10 which of the following is an example of how research i…
D. Finding out that asbestos is dangerous and limiting its use in building materials
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question 2 of 10 which of the following is an example of how chemicals …
C. Chemicals can keep bread fresher longer.
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ch. 1, 2, 3 multiple choice & short answer test locked mode is on. to a…
3 ml
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question 1 of 10 how have safety concerns about chemicals changed over …
B. As scientists have learned more about chemicals, they have become more aware of their dangers.
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what is the volume of 26.82 grams of copper if the density of copper is…
3 mL
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a scientist is conducting an experiment in which they measure the amoun…
Quantitative Observation
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5. classify each example below as the type of matter it is (element, co…
a. Mixture b. Compound c. Compound
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question 1 1 pts which of the following is the electron configuration o…
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{9}$ (assuming the normal orbital - filling order as presented in the options and not the more stable actual configurati…
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practice it tendency to focus on only one aspect of a situation at a ti…
B. centration
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4. classify each example below as the type of matter is it (element, co…
a. Compound b. Heterogeneous mixture c. Element d. Homogeneous mixture e. Compound f. Compound g. Heterogeneous mixture h. Homogeneous mixture
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3. fill in the flowchart below using the following terms: matter, subst…
Left branch (top - down): Substance, Element, Compound Right branch (top - down): Mixture, Heterogeneous, Homogeneous
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practice it process of incorporating new objects or situations into exi…
D. assimilation
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1. explain the main difference between a compound and mixture
A compound is a pure - substance with fixed element ratios formed by chemical bonds. A mixture is a physical combination of substances with variable ratios.
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1 multiple choice 1 point which is true of watersheds? all watersheds a…
1. Watersheds are determined by natural slopes and water will flow downhill. 2. All of these are human impacts on watersheds.
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practice it mental framework for understanding or acting on the environ…
D. schema
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fill in the blank: fill in the blank with the correct words. 1. a_ is a…
1. scientist 2. laws 3. theory 4. scientific 5. scientists
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1 multiple choice 1 point which is the best description of the differen…
(1) weathering is breaking down into smaller pieces, erosion is carrying it away (2) topsoil
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1.2 formative (soil formation & erosion) 1 multiple choice 1 point whic…
1. weathering is breaking down into smaller pieces, erosion is carrying it away 2. topsoil
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3. which is not a type of scientist? • a) biologist • b) chemist • c) h…
C. Historian
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question 6 (1 point) saved listen i can learn about the hazards of spec…
A. reading the Safety Data Sheet
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question 10 (1 point) saved listen who should wear safety goggles in th…
D. Everyone in the lab - space
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question 9 (1 point) listen when using gloves as personal protective eq…
b) wear two pairs of gloves to increase protection
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who developed the following atomic model and what is it called? - bohr …
B. Thomson & Plum Pudding Model
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question 8 (1 point) listen orderliness can help prevent accidents in t…
D. pour all chemicals into a single container to limit the amount of cleaning needed
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which of the following is not true about waste disposal in the lab? a) …
C. Paper towels, gloves, and weigh boats should be added to the waste containers with chemicals.
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resonance is the concept that some molecules cannot be adequately repre…
True
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***4.*** of the following choices, choose the correct word that best re…
C. freezing
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***17.*** the pressure exerted by the gas in equilibrium with a pure li…
C. Vapor pressure
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when water evaporates in a closed container, water vapor collects above…
A. Liquid
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solid liquid gas plasma
solid
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is the phase change in which a substance changes from a solid to a gas …
B. Sublimation
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which three phase changes are exothermic? a. freezing, condensation, de…
A. freezing, condensation, deposition
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***20.*** any energy gained by the water after a phase change the avera…
C. Increases, rises
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3. of the following choices, choose the correct word that best represen…
C. a transition directly from vapor phase to solid phase, deposition
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question 7 which of the following statements is false? a when a substan…
C. When a substance CONDENSES, it changes from a liquid to a gas.
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of the following choices, choose the correct word that best represents …
D. vapor pressure
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of the following choices, choose the correct word that best represents …
boiling
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***2.*** of the following choices, choose the correct word that best re…
deposition
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***11.*** during a phase change, a substance undergoes a(n) a. reversib…
A. reversible change from one state to another
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what is the phase change in which a solid is converted directly to a ga…
B. sublimation
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why does ice change to water as energy is added at the melting point? a…
C. Molecules vibrate quicker, and their motion overcomes the forces of attraction.
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***19.*** * any energy removed after the freezing is complete the avera…
B. decreases, drops
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***5.*** of the following choices, choose the correct word that best re…
melting
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part 3: label the lab equipment instructions: label the following commo…
1. Eyewash station 2. Fire blanket 3. Chemical - spill kit 4. First - aid kit 5. Fire extinguisher 6. Heat - resistant gloves
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draw the lewis electron dot structures based on their location on the p…
Magnesium (Mg): 2 dots; Sulfur (S): 6 dots; Carbon (C): 4 dots; Argon (Ar): 8 dots; Nitrogen (N): 5 dots; Aluminum (Al): 3 dots; Helium (He): 2 dots; Oxygen (O): 6 dots; Hydrogen …
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what must be conserved in all resonance structures? a. the formal charg…
B. The total number of electrons.
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check the statements that are a part of the early atomic theory. check …
- Atoms combine in whole number ratios to form compounds. - Atoms cannot be created or destroyed during a chemical reaction.
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mark the statement as true or false. all of the proposed ideas by dalto…
false
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which of the following statements is true about the elements labeled a …
B - Element A forms a 2 - ion, and element B forms a 1+ ion.
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a proton is added to carbon? a proton is removed from carbon a neutron …
A neutron added: Carbon - isotope; A neutron removed: Carbon - isotope; An electron added: C⁻; An electron removed: C⁺; Element: Carbon; Number 6: Atomic number; 12, 13, 14: Mass …
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vaporization is the process of a liquid becoming a gas. as a liquid hea…
Vaporization
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when you boil water, what is happening to the particles? the particles …
The particles speed up.
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choose the correct answer. when a gas changes to a liquid, what happens…
the gas particles LOSE energy
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choose the correct answer. when a liquid changes to a gas, what happens…
the liquid particles GAIN energy
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choose the correct answer. when a liquid changes to a solid, what happe…
the liquid particles LOSE energy
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the following bohr model diagrams describe the number of electrons in d…
Incorrect model depends on diagram details. Valence electrons.
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the following bohr model diagrams describe the number of electrons in d…
(No options given for first part. For second part) Valence
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the following bohr model diagrams describe the number of electrons in d…
A. Option A
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the following bohr model diagrams describe the number of electrons in d…
B. Incorrect model (no details given about why in image, but assume it violates electron - shell rules), valence
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list 3 elements that are in the same group: a vertical column. what do …
- Three elements in same group: Lithium, Sodium, Potassium - Members of a group have same number of valence electrons.
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circle a different term that doesnt belong with the other terms in the …
Atomic Mass. Proton, Atomic Number, and Electron are related to atomic particles; Atomic Mass is about atom's mass.
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using patterns on the periodic table, write out the standard long - for…
1. Na: $1s^{2}2s^{2}2p^{6}3s^{1}$ 2. S: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}$ 3. N: $1s^{2}2s^{2}2p^{3}$ 4. Fe: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}$ 5. I: $1s^{2}2s^{2}2p^{6}3s…
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periodic table organization: how are elements arranged in the modern pe…
1. By increasing atomic number. 2. Increases. 3. A vertical column. 4. Hydrogen, lithium, sodium. 5. Same number of valence electrons.
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atomic mass = number of __________________ in the atom atomic number = …
Atomic Mass: protons and neutrons Atomic Number: protons
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what is the purpose of previewing the poem in the poetry reading proces…
For the first question: To make predictions about the poem's content based on the title. For the second question: To understand the rhythm and meaning of the poem.
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solutes and solvents quick check why does a higher temperature usually …
The molecules move faster.
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solutes and solvents quick check which substance is an example of a non…
D. vegetable oil
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use the graph to answer the question. which statement is the best expla…
As temperature rises, gas particles are moving faster and may leave the solution.