Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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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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fill out the table below based on the following chemical equation: _n₂ …
| Total # Before (reactants) | Elements | Total # After (Reactants) | |--|--|--| | 4 | N | 4 | | 10 | O | 10 | The correct coefficients for the equation is $2N_2+5O_2 ightarrow2N_…
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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
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which would be least likely to completely dissolve in water? hydrochlor…
acetic acid
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most metals share four common physical characteristics. which of the op…
D. Reactivity
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which is the order of these solutions from strong acid to strong base? …
battery acid → stomach acid → antacid → baking soda → household ammonia
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which is formed by positive ions from a base and negative ions from an …
A. salt
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which solution has the greatest number of hydroxide ions? baking soda, …
baking soda, pH = 9
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a student uses red litmus paper to test the ph value of different solut…
A. soap
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the equation shows reactants to a neutralization reaction. ca^{2+}+oh^{…
$H^+$ binds with $OH^-$ to make water.
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which best describes the ph scale? acids measure below 7. bases measure…
Acids measure below 7.
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apple juice has a lower ph than black coffee. which best explains the r…
Apple juice has more hydrogen ions than black coffee.
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name ______________ quiz 1.1 intro to stoich solve the following proble…
1. \(BaBr_2<BaCl_2<KBr<KF\) 2. \(3.23\times 10^{23}\) molecules 3. \(4.04\times 10^{23}\) molecules 4. \(4.98\ mol\)
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which substance is used in fertilizers? ○ slaked lime (ca(oh₂)) ○ formi…
C. nitric acid ($HNO_3$)
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it is very interesting to study the origin of words in our english lang…
1. Portuguese 2. stupid 3. French bacteriologist and chemist 4. Louis Pasteur 5. To destroy bacteria by heating to a prescribed temperature for a specified time 6. Latin 7. buculu…
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mrs. rushing fills a balloon with hydrogen gas to demonstrate its abili…
Mg and HCl
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why is a protective apron or lab coat important to use when working wit…
Acids break down fabrics and can cause burns if the acids are strong.
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when an old building is to be torn down, mr. phams company removes the …
hydrochloric acid
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who would most likely be required to work with sodium hydroxide? a plum…
A. a plumber
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what is a common use of nitric acid? making ointments making ceramics c…
producing dyes
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lien made this table to organize her notes on the properties of acids a…
B. taste bitter
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while researching life during colonial times, carson learns that people…
making soap
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quiz yourself on chapter 3 assignment: quiz yourself on chapter 3 quest…
B. cutaneous senses
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which substance is used to remove rust from metal? lye (naoh) hydrochlo…
B. hydrochloric acid (HCl)
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a compound that releases hydroxide ions in solution would most likely h…
It would react with lipids to form soap.
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ph, acids and bases quick check which pattern in electronegativity do e…
Electronegativity increases from left to right within a row of the periodic table.
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ph, acids and bases quick check use the reaction to answer the question…
$HCl$ is an acid, and $Cl^-$ is its conjugate base.
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ph, acids and bases quick check which statement best describes the diff…
The substance with the lower pH has 1000 times as many hydrogen ions per volume of water.
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ph, acids and bases quick check how are acids and protons related? (1 p…
An acid can donate protons to a base when they react.
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which statement best describes the effect of the free - verse form in \…
It helps the reader experience the poet's thought process.
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cf₄ + br₂ → cbr₄ + f₂ total # before (reactants) elements total # after…
1$CF_4$ + 2$Br_2$ $ ightarrow$ 1$CBr_4$ + 2$F_2$; | Total # Before (reactants) | Elements | Total # After (Products) | | ---- | ---- | ---- | | 1 | C | 1 | | 4 | F | 4 | | 4 | Br …
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mg + hcl → mgcl₂ + h₂ total # before (reactants) elements total # after…
The balanced equation is $1Mg + 2HCl ightarrow1MgCl_2+1H_2$ and the table values are: for Mg, 1 before and 1 after; for H, 2 before and 2 after; for Cl, 2 before and 2 after.
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write the formulas of the compounds produced from the listed ions.
| | $Cl^-$ | $CO_3^{2 - }$ | $OH^-$ | $SO_4^{2 - }$ | $PO_4^{3 - }$ | $NO_3^-$ | |--|--|--|--|--|--|--| | $Na^+$ | $NaCl$ | $Na_2CO_3$ | $NaOH$ | $Na_2SO_4$ | $Na_3PO_4$ | $NaNO_3…
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which stage of the nitrogen cycle does the arrow in the image represent…
No image is provided to determine the correct answer. Please provide the image for a proper response.
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which of the following features contains the smallest amount of phospho…
A. the atmosphere
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al+ __ i₂ → __ ali₃ |reactants|inventory|products| |----|----|----| | |…
2; 3; 2
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color by number element mixture compound name: ______ date: ______ per:…
1. Compound (red) 2. Element (sky - blue) 3. Mixture (purple) 4. Mixture (blue) 5. Compound (red) 6. Mixture (yellow) 7. Element (yellow - green) 8. Mixture (red - orange) 9. Comp…
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drug tolerance is best defined as ○ a. a condition in which drug users …
A. a condition in which drug users need more of the chemical to achieve the same effects.
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12. the structure of ammonia looks like this: ammonia is a(n)_. 13. ide…
12. Compound 13. Mixture 14. Solid 15. Compound
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what are chemicals called that mimic the actions of neurotransmitters i…
B. Agonist
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who first proposed that matter was composed of atoms? thomson boyle dal…
D. Democritus
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question 1 j. j. thomson and eugen goldstein used the same type of devi…
False
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al+ i₂ → ali₃ reactants inventory products al i remember: coefficients …
$2:3:2$
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sep develop a model use the space to sketch each of the three neon isot…
Sketch a model for neon - 20 with 10 protons, 10 neutrons in the nucleus and 10 electrons in two electron - shells (2 in the first, 8 in the second). Sketch a model for neon - 21 …
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multiple - choice question natural gas is also an example of: hydrogen …
C. Methane
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4. the elements within a ______ can be separated by physical means. 5. …
4. Mixture 5. Compound 6. Mixture 7. Element 8. Mixture 9. Compound 10. Element 11. Mixture
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step 2: measure the reaction rate at ~20 - c (room temperature) your ta…
Temperature of the water: $20$ °C. Reaction time: $34.20$ seconds
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1. molecules that have more than one type of atom chemically bonded tog…
1. Compound 2. Element 3. Mixture
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1ch₄ + 2o₂ → 1co₂ + 2h₂o elements total # before (reactants) total # af…
| Elements | Total # Before (reactants) | Total # After (Products) | |--|--|--| | C | 1 | 1 | | H | 4 | 4 | | O | 4 | 4 | True
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consider methane (ch4) how many molecules of methane do we have? how ma…
How many molecules of methane do we have? 2 How many TOTAL atoms of carbon do we have? 2 How many TOTAL atoms of hydrogen do we have? 8