Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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example #1: ionization energy 1. which of the following elements will h…
1. c) Ra 2. b) Cl
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what is the primary factor that determines the state of matter of a sub…
D. Temperature
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which are examples of elements? (select all) oil oxygen water carbon qu…
For the first question: oxygen, carbon For the second question: electron, neutron, proton
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what is one reason why the author includes the information about what e…
# Breve explicación: Al hablar sobre las energías que utiliza un automóvil, el autor probablemente busca explicar cómo la energía hace que el coche se mueva. Las otras opciones so…
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exothermic reactions absorbs energy true false question 27 1 pts respir…
1. False 2. True
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what is the rhyme scheme of \a psalm of life\? abba aabb abbc abab
D. ABAB
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water sticking to itself is called cohesion adhesion solubility surface…
Question 1: A. Cohesion Question 2: A. Adhesion
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which of the following is exothermic? burning wood evaporation melting …
Question 1: burning wood Question 2: evaporation
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an exothermic reaction ______ energy. creates releases absorbs destroys
B. releases
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an exothermic reaction ____ energy. creates releases absorbs destroys
B. releases
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question 4 an endothermic reaction ____ energy. absorbs destroys releas…
A. absorbs
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9 which criterion is primarily used in the modern periodic table, and w…
C. Atomic number, representing the number of protons in the nucleus
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an endothermic reaction ____ energy. absorbs destroys releases creates
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7 which of the following elements is a metalloid and is commonly used i…
B. Silicon, D. Germanium
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what happens to matter during a chemical reaction according to the law …
A. Matter is conserved.
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how many oxygen atoms are present on the reactant side before balancing…
a. 2
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in the equation $ch_4 + o_2 \to co_2 + h_2o$, what is unbalanced? a. hy…
c. Both hydrogen and oxygen atoms
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when atoms combine, they form: protons cells elements molecules
D. molecules
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when atoms combine, they form: protons cells elements molecules
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question 2 1 pts which of the following is an element? sugar carbon sal…
B. carbon
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which of the following is an element? o sugar o carbon o o water
carbon
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which of the following is an element? o sugar o carbon o o water
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in the equation $ch_4 + o_2 \to co_2 + h_2o$, what is unbalanced? a. hy…
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what is the correct coefficient for h₂o when balancing the equation ch₄…
A. 2
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in the combustion of methane $ch_4 + 2o_2 ightarrow co_2 + 2h_2o$, how …
d. 4
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which description is an example of direct characterization? a. amir was…
A. Amir was always in good spirits — his laugh would bubble through the room, infecting those around him with giggles.
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question 25 which of the following is an example of a physical property…
Texture
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chemical properties describes changes in density or phase describe chan…
C. Describes the Chemical composition of a substance
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read this sentence from the passage. morgan, realizing that he had inve…
C. a fluid chemical mixture
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when your body takes the chemical energy in food and transforms it so y…
Question 1: Mechanical energy Question 2: Thermal energy Question 3: True
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question 3 at what point on a roller coaster is the kinetic energy incr…
Question 3: A. As it is going down the hill Question 4: Gravitational potential energy
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the substance is a gas at point ______
F
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what type of energy is formed when chemical bonds are broken? radiant e…
- Question 3: Chemical energy - Question 4: 8 (assuming a comprehensive list - there are many types of energy and 8 is the highest option given here)
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which of the following is an example of mechanical energy? the light fr…
- Question 1: The energy in a ball as it is falling. - Question 2: A washing machine - Question 3: Chemical energy
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which of these molecular formulas is a carbohydrate? c₁₄h₂₈o₂ c₉h₁₃no₃ …
$C_4H_8O_4$
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this exam is closed - book. before starting, make sure you have studied…
B. whose manufacture, possession, or use is regulated by government
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this exam is closed - book. before starting, make sure you have studied…
D. observations about the patient's mentation
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as you heat up a pot of water, what accurately describes what happens t…
evaporated
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which list of the phases of h₂o is arranged in order of increasing spac…
ice, water, steam
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multiple - choice question for our purposes we are going to simplify th…
B. H + H --> He
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an element located in group 18 and period 4 would be classified as whic…
Non - metal
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question 6 4pt magnesium (mg) is an example of a: metalloid metal no an…
Metal
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physical science the average velocity v of gas molecules is represented…
$407$
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fe (iron) can be found on the periodic table. iron is an example of a e…
A. Element
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vinegar is a liquid mixture of both ch3co2h and h2. vinegar is an examp…
C. Homogeneous mixture
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question 3 4 pts which of the following is an example of a heterogeneou…
chicken noodle soup.
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example #1: atomic radii 1. which of the following elements will have t…
1. d) F 2. d) Ba 3. c) Br
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which acts like an acid. amino acids also contain a third functional gr…
A. an amino group and a carboxyl group
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which of the following is an example of a homogeneous mixture? mcdonald…
McDonalds Sweet Tea
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which change to the model would improve its accuracy? a. move each neut…
B. Move the protons and neutrons to a small space in the center.
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a scientist is studying two isotopes of sodium, labeled a and b. in iso…
C. 11 protons, 13 neutrons, and 11 electrons
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the given chemical reaction summarizes the process of photosynthesis in…
C atoms in the reactants: 6 H atoms in the reactants: 24 O atoms in the reactants: 24 C atoms in the products: 6 H atoms in the products: 24 O atoms in the products: 24
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what is the active ingredient in aspirin? a methylsalicylate b acetylsa…
B. acetylsalicylic acid
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match each nutrient class with its description. water proteins vitamins…
water - help(s) cleanse the body of toxins proteins - build(s) and maintain(s) tissue vitamins - facilitate(s) normal growth and function; organic compound fats - store(s) calorie…
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12 rank the following elements in order of increasing electronegativity…
Sr, Co, Se
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9 pick the right options in the dropdown below. noble gases have high i…
Noble gases have high ionization energy and zero electronegativity.
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7 what general area on the periodic table has the most reactive metals?…
C. lower left
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19. why should food and drinks never be brought into the lab? mark all …
Chemicals can contaminate them
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what should you do if a chemical splashes in your eyes? rub your eyes i…
Rinse with water for at least 15 minutes
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6 drag and drop the right answer in the answers below. group 1 elements…
Group 1 elements are alkali metals. The other options do not match the description. Noble gases have high ionization energies as they have a full outer - shell configuration. Halo…
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17. which of the following should you always wear when working with che…
Safety goggles
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5 what general area on the periodic table has the most reactive nonmeta…
A. upper right
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15. which of these is an example of a mixture? mark all that apply sodi…
Salt water
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in the balanced equation for the reaction between hydrogen and oxygen t…
2
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in the reaction of methane combustion, the balanced equation produces t…
Water
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8. which of the following is a physical property? mark all that apply f…
C. Density
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7. which of the following is a pure substance? mark all that apply air …
B. Salt (NaCl)
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if i want the most precise measurement of 8ml of water then i should us…
True
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6. before developing a new drug, scientists must study: mark all that a…
The chemistry of the disease and drug effects on the body
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a. directions: underline the relative clause in each sentence. then, ci…
1. - Underlined relative clause: whose mother is a chemical engineer; Circled noun: friend - Underlined relative clause: which offers horseback riding; Circled noun: Proud Ranch -…
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select all of the options that are compounds. □ ammonia (nh₃) □ nitroge…
A. Ammonia ($NH_3$), C. Water ($H_2O$)
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i. write one similarity and one difference between the first and the la…
i. Similarity: Both are part of the soil - related structure. Difference: The organic layer is mainly organic matter while bedrock is solid rock. ii. Clay, Minerals
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1. use the partial periodic - table to answer the question. what is tru…
Silicon has 2 more valence electrons than magnesium (Mg).
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a student makes inferences about the elements circled in columns 10 and…
These metals are lustrous, malleable, and ductile.
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a teacher shades an element on a partial section of the periodic table,…
reactive in nature
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which statement is true regarding a compound? a compound is composed of…
A compound is made up of two or more different atoms that are chemically combined.
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fill out the table below based on the following chemical equation. __nh…
| Elements | Total # Before (reactants) | Total # After (products) | | ---- | ---- | ---- | | N | 1 | 1 | | H | 4 | 4 | | Cl | 1 | 1 | The correct coefficients for the equation is…
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consider chemical reaction c. is reaction c a dehydration or hydrolysis…
dehydration
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identify the given chemical reactions as either a dehydration or hydrol…
Reaction A: hydrolysis Reaction B: hydrolysis
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el estudiante b dice: los electrones están fuera del núcleo, en capas d…
1. El estudiante B tiene razón porque los electrones se encuentran fuera del núcleo en capas de energía y los protones y neutrones se encuentran dentro del núcleo. 2. | Partícula …
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5) balance the chemical equation below: ______c₂h₆ + ______o₂ → ______c…
(a) The theoretical yield of $CO_2$ is $3.03\ g$. (b) The percent yield of the reaction is $74.3\%$.
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fill out the table below based on the following chemical equation: __rb…
| Total # Before (reactants) | Elements | Total # After (Products) | | ---- | ---- | ---- | | 16 | Rb | 16 | | 8 | S | 8 | The correct coefficients for the equation is: 16 $Rb$+ 1…
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which substance is important in making plastics? o zinc hydroxide o amm…
None of the above options are typically important substances in making plastics.
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which is a pure substance? air nitrogen apple juice tap water
B. nitrogen
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fill out the table below based on the following chemical equation: __hg…
The correct coefficients for the equation is $2HgO ightarrow 2Hg + 1O_2$. | Total # Before (reactants) | Elements | Total # After (Products) | | ---- | ---- | ---- | | 2 | Hg | 2 …
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for each example, identify if the food contains mostly saturated or uns…
Vegetable oil: unsaturated Chocolate: saturated Cheese: saturated Flaxseed oil: unsaturated
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fill out the table below based on the following chemical equation: __xe…
| Total # Before (reactants) | Elements | Total # After (Reactants) | | ---- | ---- | ---- | | 1 | Xe | 1 | | 6 | F | 6 | The correct coefficients for the equation is: 1 Xe + 3 $\…
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which separation procedure is most likely to happen? freezing a compoun…
Filtering a mixture will separate it into substances.
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a student is trying to determine if a solution is acidic or basic. she …
C. cabbage juice
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which solution has the greatest number of hydrogen ions? blood, ph = 7.…
lemon juice, pH = 2
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the ph of a solution is 7. which best describes the solution? the solut…
The solution has the same number of hydrogen ions and hydroxide ions.
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a student combined equal amounts of two solutions. one solution had a p…
B. 3
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el estudiante b dice: “los electrones están fuera del núcleo, en capas …
# Breve Explicación: Según la estructura atómica, los electrones se encuentran fuera del núcleo en capas de energía o orbitales electrónicos, mientras que los protones y neutrones…
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which is a property of every homogeneous mixture? each part of the mixt…
Each part of the mixture has the same appearance.
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fred has a large piece of sugar that is not dissolving in his drink. ho…
by breaking it up into smaller pieces
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zora wants to dissolve a solute in a solvent quickly. which best descri…
C. shake it repeatedly
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helen needs to make a supersaturated solution of saltwater. which descr…
increase the temperature of the solution and add more salt
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which jar contains a mixture? a jar of solid carbon a jar of carbon dio…
a jar of copper and water
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unit test unit test review active solution preparation solubility of th…
Solution A
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which of the following is the most reactive group of non - metals? alka…
C. Halogen