Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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127 chemistry prep b unit 1 ch. 3 test multiple choice: read each quest…
1. d. Both a and b 2. c. Volume 3. c. Reactants 4. b. Freezing 5. d. Energy 6. c. Burning 7. c. Melting chocolate 8. e. Sublimation 9. c. Mass 10. d. anything that has mass and ta…
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warning chemical has been detected to synchronize the lasers and target…
There is not enough information to determine the correct answer among the options provided.
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what would be the most accurate electron configuration model for a neut…
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴
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warning chemical has been detected to synchronize the lasers and target…
This chemical can cause fluid to build up in the lungs
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which of the following elements are most likely similar in physical and…
D. Mg and Ba
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what do you notice about the connection between the number of orbitals …
1. Each orbital can hold 2 electrons, so the number of electrons a shell can hold is 2 times the number of orbitals in that shell. 2. Helium has its outermost electrons in the 1s …
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how many valence electrons are in an atom of gallium (ga), which has th…
B. 3
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which of the following electron transitions (energy transition) in the …
Moving from Level 2 to Level 1
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how many electrons can fill the lowest energy level of an argon atom? 2…
A. 2
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how does nicotine in tobacco products affect the brain? enhances mood l…
Leads to changes in brain chemistry
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what would be the result of increasing the number of protons in an atom…
The atom would be a different element.
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which of the following atoms would be electrically neutral? o 10 proton…
5 protons, 10 neutrons, 5 electrons
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silicon is the second most abundant element in the earths crust. it is …
28.1 amu
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which of the following best represents a pair of isotopes? carbon-12 an…
Carbon-12 and Carbon-14
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the image below shows an isotope of lithium. write the isotope notation…
A. $^{7}_{3}\text{Li}$
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iclicker: how much energy is required to vaporize 32.9 g of ethanol at …
A. 29.0 kJ
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lesson: secondhand smoke secondhand smoke contains more than chemicals,…
First blank: 7,000 Second blank: 70 Third blank: Hundreds
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t/f (change false statements to be true) 1. in a physical change, a sub…
1. False. In a physical change, a substance's composition does not change. 2. False. Density is an intensive physical property. 3. False. Cutting a piece of paper is a physical ch…
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9. describe the results of a physical change and list three examples of…
9. Results: Change in physical properties, composition unchanged. Examples: melting ice, tearing paper, bending metal. 10. Results: New substances formed. Examples: rusting iron, …
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chemistry unit 1b practice ws#2 name daniya turner section 3.1 properti…
a. Chemical b. Physical c. Chemical d. Physical e. Physical f. Chemical
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5. a solution is prepared by dissolving 5.00 g of potassium nitrate (kn…
$0.309\ M$ ### 5b. % mass of KNO₃ in the solution
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mrs. jacksons science class is learning about how baking soda and vineg…
$1\frac{2}{7}$ liters
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what does it mean if elements are in the same group? what does it mean …
If elements are in the same period, it means they have the same principal energy level. If elements are in the same group, it means they have the same number of valence electrons.
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what information do you get from each element on the periodic table? wh…
- Information from carbon's periodic - table entry: Atomic number (6, number of protons), atomic mass (12.011). - Elements in the same group: Same number of valence electrons, sim…
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2. complete and write the overall chemical equation, the complete ionic…
**2.a)** - Overall Chemical Equation: $KOH(aq)+HCl(aq) ightarrow KCl(aq) + H_2O(l)$ - Complete Ionic Equation: $K^+(aq)+OH^-(aq)+H^+(aq)+Cl^-(aq) ightarrow K^+(aq)+Cl^-(aq)+H_2O(l…
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1. write a balanced equation for the reaction of kmno₄ with h₂o₂ in the…
# Explanation: ## Step1: Write balanced chemical equation The reaction is a redox - reaction. The balanced equation is $2KMnO_4 + 5H_2O_2+ 3H_2SO_4=K_2SO_4 + 2MnSO_4+ 5O_2\uparrow…
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write an analysis explaining how john masefields poem sea fever is writ…
"Sea - Fever" has a structured form with four quatrains, an ABAB rhyme scheme in each stanza, and a regular meter using iambic feet.
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i must go down to the seas again, to the vagrant gypsy life, to the gul…
EEFF
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in colder climate regions, lakes and ponds freeze in the winter. the so…
Water molecules arrange themselves in a structure with more space between them, making the ice less dense and causing it to float.
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1. predict the products of the following reactions. identify the precip…
| Chemical Reactions | Precipitate | Spectator Ions | Net Ionic Equation | | ---- | ---- | ---- | ---- | | a. $AgNO_3(aq)+NaBr(aq) ightarrow$ | $AgBr$ | $Na^+,NO_3^-$ | $Ag^+(aq)+…
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question 1-1 what property of water allows it to be a versatile solvent…
polarity
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i must go down to the seas again, for the call of the running tide is a…
"tide" and "denied"
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and all i ask is a windy day with the white clouds flying, and the flun…
How many stanzas are in the poem? - 2 What is the rhyme scheme of the first stanza? - abcb What poetic structure does Masefield use? - Fixed - form poem
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ancient atomic models described the atom as a solid sphere with no char…
D. Subatomic particles could not be detected with the technology available.
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walt whitman was an american poet who was born in 1819. leaves of grass…
It has a free form. It does not have a specific rhyme scheme. It does not have a set meter.
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why do elements emit different colors of light when placed in a flame? …
A. Elements emit light because electrons get excited & then fall back to the ground state from an excited state
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all ______ is made of tiny particles called ______. atoms are made of e…
All matter is made of tiny particles called atoms. Atoms are made of even smaller particles called neutrons, protons, & electrons.
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2. combine the oxidation and reduction half - reactions for hydrogen pe…
$2MnO_4^-+5H_2O_2 + 6H^+ ightarrow 2Mn^{2 + }+5O_2 + 8H_2O$
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what are the reactants of this chemical reaction?
# Explicación: ## Paso 1: Identificar los compuestos de entrada Los reactivos son los compuestos que entran en una reacción química. Aquí, vemos que el agua ($H_2O$) y el dióxido …
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grams to atoms 5.11 g b 8.02 g s 1.5 g k 0.2550 g pt 1.37×10⁻¹⁰ g au
Boron: Approximately $2.84\times 10^{23}$ atoms Sulfur: $1.51\times 10^{23}$ atoms Potassium: Approximately $2.31\times 10^{22}$ atoms Platinum: Approximately $7.89\times 10^{20}$…
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question 19 (mandatory) (1 point) chest pain associated with coronary a…
Question 19: A. angina pectoris Question 20: B. pericardium
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name: elements, compounds, mixtures color by numbers directions: answer…
1. C. atom (purple) 2. B. molecule (yellow) 3. B. compound (blue) 4. A. molecule (pink) 5. B. mixture (pink) 6. A. compound (yellow) 7. C. mixture (pink) 8. C. at least one capita…
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the approximate molar concentration of several chemicals are given. fin…
Oven cleaner: 13 Water: 6.2 Blood: 7.4 Vinegar: 2.2
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green fertilizers promise a natural solution for promoting crop growth.…
- Green fertilizers improve soil quality using natural ingredients. - Companion planting does not necessarily require the use of chemical fertilizers. - Some fertilizers contain h…
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read the poem. skimming the bottom in the company of toes, i observe th…
C. abcb
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based on the reading, what are the properties of carbon - 14? check all…
Carbon-14 is a naturally occurring carbon isotope. Carbon-14 has a known half-life. Carbon-14 is present in all living organisms.
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exploring willard f. libby’s life willard f. libby received his undergr…
He received his undergraduate degree from University of California, Berkeley. After graduate work, he became a professor at University of Chicago. In 1960, he won a Nobel Prize in…
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23. where are the most stable elements found on the periodic table?
Group 18 (noble gases) of the periodic table.
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17. what is the ratio of protons to neutrons that is in the stable rang…
17. Approximately \(1:1\) to \(1.5:1\) 18. Elements with atomic number \(Z > 83\)
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10 multiple choice 1 point which of the following is not a key componen…
A. Fractionating column
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multiple choice 1 point what would you expect to happen if you used sim…
Both liquids would vaporize at the same time, resulting in poor separation.
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8 multiple choice 1 point why is it important to control the rate of he…
Heating too fast can cause both components to vaporize together, reducing the efficiency of separation.
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7 multiple choice 1 point in a simple distillation, what component dist…
The component with the lowest boiling point.
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6 multiple choice 1 point what is the role of the condenser in simple d…
To cool the vapor back into liquid
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multiple choice 1 point what is the main purpose of simple distillation…
To separate components of a liquid mixture based on differences in boiling points.
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multiple choice 1 point what happens if you heat the distillation flask…
B. Both components may vaporize together, leading to poor separation
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multiple choice 1 point which of the following conditions would be most…
Sealing the apparatus completely.
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2 multiple choice 1 point which of the following mixtures would be best…
D. A mixture of hexane and octane (boiling points: 69°C and 126°C).
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pre - lab quiz 5 answer all questions 1 multiple choice 1 point what is…
To collect the vaporized and condensed distillate
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5. ionic compounds containing transition metals are slightly different …
$CuCl_2$: copper(II) chloride; $CoS$: cobalt(II) sulfide; chromium(III) oxide: $Cr_2O_3$; titanium(IV) nitrite: $Ti(NO_2)_4$; $SiF_6$: silicon hexafluoride; $NO$: nitrogen monoxid…
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3. ionic compounds containing polyatomic ions are named similarly to bi…
$NaClO_3$: sodium chlorate $NaHCO_3$: sodium hydrogen carbonate (sodium bicarbonate) $K_2CrO_4$: potassium chromate $NH_4Cl$: ammonium chloride $MgSO_4$: magnesium sulfate $KNO_3$…
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directions: utilize the rules for chemical nomenclature contained in ch…
1. KF: potassium fluoride CaS: calcium sulfide LiBr: lithium bromide MgF₂: magnesium fluoride Be₃N₂: beryllium nitride Na₂O: sodium oxide KCl: potassium chloride CaO: calcium oxid…
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question 24 of 40 read the following description of a literary work: a …
B. Naming the owner of the chemical company after a fairy tale villain
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two of the covalent bonds are labeled with blank spaces. drag and drop …
Place one electron from $H$ and one electron from $O$ in each of the blank - space covalent bonds.
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now, drag and drop the correct partial charge symbol to label each atom.
For the oxygen atoms: $\delta^-$ For the hydrogen atoms: $\delta^+$
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which of the following best matches the description? condition in which…
A. thermal inversion
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which of the following is a secondary air pollutant? select one: a. ozo…
A. ozone
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the remains of plants, animals, and microorganisms are commonly referre…
b. compost
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which of the following best matches the description? biome that lacks t…
B. tundra
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which of the following best matches the description? uncharged particle…
g. neutron
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which of the following best matches the description? compound with a lo…
f. acid
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1. how would you complete this sentence? say it aloud to a partner. i w…
1. Varies (e.g., diverse) 2. b. many errors, c. no main idea 3. a. Catchy melody, b. Meaningful lyrics, c. Good rhythm 4. Varies Day 4: 1. Varies (e.g., soft and moldable) 2. a. f…
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3 the effects of mixtures of chemicals causing hazardous materials is c…
C. synergism
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which of the following air pollutants has been the most difficult to re…
d. ozone
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photochemical smog forms when ______ and ______ are trapped by a therma…
D. volatile organic compounds; oxides of nitrogen
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which of the following best matches the description? accumulation of po…
i. acid deposition
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which condition must exist in order for conduction to occur between two…
The molecules of the substances must be touching.
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conduction occurs when thermal energy is transferred by the movement of…
molecules
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which two conditions must exist in order for radiation to occur? the pr…
A temperature difference and the presence of electromagnetic waves
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which best describes a wave? a collision of particles a disturbance tha…
B. a disturbance that carries energy
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which of these uses logos? a. we are starving because the food, if you …
C. Yum Organics has been providing well - rounded organic lunches to schools on the West Coast for more than 15 years.
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what is biochemical oxygen demand? select one: o a. amount of oxygenreq…
A. amount of oxygen required to decay a certain amount of organic matter
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the amount of oxygen required to decay a certain amount of organic matt…
D. the biochemical oxygen demand.
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which one of the following is not associated with hydraulic fracturing …
A. an increased price for natural gas
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study the graph about the negative effects of indoor air pollution. ind…
Most people will die from the negative health effects associated with stroke as indoor dirty air builds up.
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how does the ozone layer help maintain ground - level air quality?
The ozone layer in the stratosphere absorbs harmful UV radiation, reducing chemical reactions in the lower atmosphere that could produce ground - level pollutants, thus maintainin…
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use the instructions below to complete the assignment: you are a molecu…
Here is a short poem from the perspective of a water - molecule: **"The Water - Molecule's Journey"** I'm a water - molecule, small but grand, In the ocean I start, in a liquid la…
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9. your energy journey: think about a simple action you do every day, l…
The chain of energy transformations for walking to school: Chemical energy in food → Chemical energy in ATP → Mechanical energy. For turning on a video - game console: Chemical en…
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explain how ozone in the stratosphere is formed.
Ozone in the stratosphere is formed when UV radiation splits oxygen - molecules into oxygen atoms, which then combine with oxygen - molecules to create ozone.
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88. which electron - configuration notation describes an atom in an exc…
c. [Kr]5s²4d¹
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5. practice: turn off show electron dot diagram. use the gizmo to creat…
Lithium: Sodium Beryllium: Magnesium
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5) during a temperature experiment, the room gets too warm because a wi…
5) Systematic error 6) Human error 7) Measurement error 8) Sampling error 9) Experimental error 10) Experimental design error
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the following is a chemical reaction for ______ with ozone. clo + bro →…
B. halons
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a chemist is using 3.32 milliliters of a solution of acid and water. if…
0.5
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select the correct answer. which of the following is a medicine that st…
# Breve explicación: Los antitoxinas son sustancias que estimulan la respuesta inmune del cuerpo para producir anticuerpos que neutralicen toxinas producidas por patógenos. Los an…
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7 analyze as the bright sun shines upon the water, the water slowly dis…
The disappearance of water is a physical change. The conversion of water and carbon dioxide into sugar and oxygen by plants is a chemical change. ### 8
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critical thinking use this photo to answer the following question. 7 an…
The disappearance of water is a physical change. The conversion of water and carbon - dioxide into sugar and oxygen by plants is a chemical change. ### Question 8
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chemistry chapter 1 - 4 crossword review across 2 a 27.092 g object has…
2. 28.8 6. mL 7. cm 8. product 9. density 12. compound 13. chemical 15. kg 17. one 20. homogeneous mixture 21. reactant 23. 5 24. qualitative 25. heterogeneous mixture 27. kilogra…
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is this a complete sentence? due to the structure of hydrogen bonds, ic…
yes
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7. why are fish eggs particularly sensitive to ph changes? 8. how does …
7. Their membranes are vulnerable and chemical reactions for development can be affected. 8. Low pH dissolves metals making them bio - available; metals are toxic to aquatic organ…