化学
化学反应、化学计量、分子结构与元素性质。
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identify the element and number of neutrons in atoms represented by the…
The element is Germanium (Ge), and the number of neutrons in atoms represented by the peak at 74 amu is 42.
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read this! when designing an experiment, you need to consider three typ…
To solve for identifying variables in each experiment, we analyze each model: ### 1. Alka - Seltzer® and Vinegar - **Independent Variable**: The factor we change. For example, the…
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introduction to energy 1) define the following terms using the informat…
To answer this, we use the definitions from the "Introduction to Energy" Google Slides (as per the problem's instruction, we can't use Google Search here, but here are typical def…
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for your first graph, what are the following graphical relationships? q…
linear ### Question 5
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model 3 – boiling points of alcohols alcohol name | formula | number of…
Similarities: All are alcohols (contain hydroxyl group), same volume (75 mL) and room pressure (101 kPa). Differences: Different carbon atom counts (1–5), boiling points (64.7–137…
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question 8 (5 points) listen question 7) consider your second graph. wh…
d) increases, but is not linear
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the lab burner 1. never leave a lit burner __________________________! …
s (selected key blanks as examples, full answers depend on standard lab safety teachings): 1. (The Lab Burner - 1) unattended 2. (The Lab Burner - 2) the same; hot; care 3. (The L…
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model 2 – results of alka-seltzer experiment | | trial 1 | trial 2 | tr…
Trial 5 ### Question 6a
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question 10) in the procedure section of the lab, a graph is provided f…
Dependent Variable: 8. Atomic Radii (pm) Independent Variable: 4. Atomic Number (Z)
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model 2 – results of alka-seltzer® experiment trial 1\ttrial 2\ttrial 3…
Trial 1
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dimensional analysis worksheet - densities name______________________ d…
\(0.87\ \text{cm}^3\) (or \(0.87\ \text{mL}\)) ### Problem 2: Volume of 20 g of gold
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question 10 (6 points) listen question 9) which element, copper or alum…
Copper
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bowl | mass (g) | volume (cm³) | reacts with hcl acid? | attracted to a…
My understanding changed as I learned that multiple properties (density, chemical reactivity, magnetic behavior) are needed to identify a substance, not just one. For example, the…
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idea | notes --- | --- | 1. always notify your teacher first!! | 2. swe…
To answer these lab safety questions (related to chemistry, a subfield of Natural Science): ### For the fill - in - the - blanks (top table): 1. (No blank here, it's a directive) …
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5) the pie graph below shows the elements comprising earths crust in pe…
D) silicon
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5) the pie graph below shows the elements comprising earths crust in pe…
Since the problem statement is incomplete (no specific question about the pie graph is provided, like finding the percentage of an element, identifying element X, etc.), we can't …
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assessment question 3 are the following statements true or false? true …
False ### Second Statement: "Portable bottles containing water do not need a label."
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assessment question 2 what does this pictogram warn you of? (select the…
B. Exclamation Mark: The chemical could irritate eyes and skin or cause breathing problems.
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what does this pictogram warn you of? (select the best answer.) corrosi…
A. Corrosion: The chemical could burn or damage skin and eyes.
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2) which one of the following groups of elements is listed in increasin…
A) magnesium, iron, aluminum
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question 11) which number on the nfpa safety diamond is more dangerous …
4 (the option: 4)
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which example is most likely an inorganic compound? ○ methane, which is…
C. sodium chloride, which is a salt
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aluminum is an element. which best describes what makes up a sample of …
A. one kind of atom
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which is the smallest possible particle of an element? ○ molecule ○ ato…
B. atom
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chemistry 327 prep ii cycle 1 lecture hw name: antoine g, sec:____ page…
### Definitions 1. **Chemistry**: The scientific study of the composition, structure, properties, and reactions of matter, especially of atomic and molecular systems. 2. **Matter*…
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which statement is true about inorganic compounds? ○ they are not made …
They are not made from living things.
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in case of accident 1. always notify your teacher first!! 2. sweep up a…
### In Case of Accident 2. **Sweep up any \(\boldsymbol{\text{broken glass}}\) and \(\boldsymbol{\text{dispose}}\) of as directed by your teacher.** (Broken glass is a common lab …
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sublimation the change of a substance from solid to vapor without passi…
To solve this, we analyze each substance's intermolecular forces/bonds and determine if they are weak enough for sublimation at STP (sublimation occurs in solids with very weak in…
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monosaccharides are the building blocks of carbohydrates. they may be f…
- Glucose, fructose, and galactose are monosaccharides. - All three molecules have six carbon atoms.
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which of the following statements about subatomic particles are true, a…
True: - Protons have about the same mass as neutrons. - Protons and electrons have charges of the same magnitude but opposite sign. False: - Some atoms don't have any protons. - P…
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8. no ________________________ in the lab! copyright ©2018 chemistry co…
To solve these lab safety fill - in - the - blanks, we rely on standard lab safety knowledge: ### For the "In Case of Accident" section: #### Step 1: Analyze the second note In a …
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ing atoms worksheet: ments to subatomic particles 7. protons ____ atomi…
Protons: 5; Neutrons: 4; Electrons: 5; Atomic Mass: 9; Atomic Number: 5; Element Symbol: B; Element Name: Boron; Ion: no; Charge: 0
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quantities and info about each atom. 7. protons ____ atomic mass ____ n…
Protons: 7 Neutrons: 7 Electrons: 7 Atomic Mass: 14 Atomic Number: 7 Element Symbol: N Element Name: Nitrogen Ion: no Charge: 0
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classify the following statements as consistent or inconsistent with ru…
To solve this, we use Rutherford’s nuclear theory: 1. Most of an atom’s mass and positive charge are in the nucleus. 2. Electrons are outside the nucleus, with negligible mass. 3.…
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11. when powdered iron is left exposed to the air, it rusts. explain wh…
Rusting is a chemical reaction where iron reacts with oxygen and water from the air. By the law of conservation of mass, the mass of rust (products: iron + oxygen + water) is grea…
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a phosphorus atom combines with 2.5 hydrogen atoms to form a phosphine …
D. Atoms combine in simple, whole - number ratios to form compounds. ### Part C (Destruction of Atoms in Compound Formation and Dalton's Theory)
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missed this? read section 2.3 (page) ; watch kcv 2.3 which of the follo…
- The formation of a compound often involves the destruction of one or more atoms. - A phosphorus atom combines with 2.5 hydrogen atoms to form a phosphine molecule.
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8.3 micrograms = ? nanograms
8300 nanograms
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the freezing point of pure water is 0°c, but adding salt to water chang…
colder than pure water's freezing point
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8. protons ______ atomic mass ______ neutrons ______ atomic number ____…
Protons: 6; Atomic Mass: 12; Neutrons: 6; Atomic Number: 6; Electrons: 6; Element Symbol: C; Element Name: Carbon; Ion: no; Charge: 0 (Note: The values are based on the assumption…
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match each term to its description. use a number-two pencil only. 1. if…
1. D. Boyle's law ### Question 2
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science matter and energy 2nd ed. test 4 chapter 4 match each term to i…
D. Boyle's law ### Question 2
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1. no shorts, skirts, or ____________________. 2. roll up _____________…
1. sandals 2. sleeves 3. tied back 5. goggles; apron 6. food; drinks Lower section (examples): 1. approved 2. taste 3. wafting 4. horseplay 5. acid to water; water to acid; stirri…
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3. handle chemicals carefully. 4. no ________ in the lab! all direction…
eating (or drinking, horseplay, running etc. ; "eating" is a common standard answer)
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25. what was a key feature of giotto’s frescoes in the scrovegni chapel…
d. Lifelike representations of human emotion
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6. protons ____ atomic mass ____ neutrons ____ atomic number ____ elect…
Protons: 6; Atomic Mass: 12; Neutrons: 6; Atomic Number: 6; Electrons: 6; Element Symbol: C; Element Name: Carbon; Ion: no; Charge: 0
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1. lab safety is a critical concept! 2. always use safety in the lab. 3…
s: 4. horseplay (or other appropriate answers like eating/drinking, running) 5. Follow 6. safety 7. the first - aid kit (or other safety equipment) 8. stools (or other appropriate…
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question 6 of 10 read this poem: roses are red, violets are blue, dodoe…
A. abcd
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what’s a mlm?1 show text what makes a pyramid scheme illegal? requiring…
D. Mainly generating profits from the recruitment of new members.
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lemon juice can cause milk to curdle, or form solid clumps. olivia mixe…
Does the type of milk affect the sizes of clumps formed when the milk curdles?
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use the passage to answer the question. what context clues help you ver…
D. "chemicals produced by humans" (assuming the option with "chemicals produced by humans" is labeled D; if the original labeling is different, adjust the label accordingly, e.g.,…
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multiple-choice question you can find out how many neutrons are in an a…
A. subtracting the number of protons from the atomic mass of the atom
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q.13. the density of aluminium is 2.70 g/cm³. what is the volume of 675…
c) 250 cm³
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quiz review 1. how many significant figures are in the following number…
3 #### Part b: 8.5000
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6. what was a key feature of giotto’s frescoes in the scrovegni chapel?…
a. Lifelike representations of human emotion
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multiple-choice question in an element’s symbol, ____ must be capitaliz…
A. The first letter
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if an atom has 16 protons, it will have ______. 16 electrons 32 neutron…
16 electrons (the option with "16 electrons" should be selected)
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ing parts of an atom ideas about matter 1. many ancient greek philosoph…
earth 2. **Explanation for Q2**: Early scientists lacked methods to test/verify their theories (experimental validation was limited).
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4. look at the table below. explain the correlation between atomic (or …
There is a negative correlation: as atomic (or molecular) mass increases, the height (altitude) at which the gas is predominantly found decreases. Lighter gases (lower atomic mass…
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suzanne watches a survival skills program on television. she makes a sk…
It screens water out of the cactus pieces.
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fill in the blank with the correct vocabulary word. daniel had a ____ p…
A. fervent
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cover the flask with a balloon, and their reactants, baking soda and vi…
A. Mass is conserved during a chemical reaction.
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kc: conservation of mass quiz prep name: ____ pg #. ____ 1. in a reacti…
The mass of sodium chloride formed is 58.44 g. The word equation is Sodium + Chlorine → Sodium Chloride. ### Question 2
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water being separated with an electric current into hydrogen and oxygen…
B. water is a compound.
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which technology measures climate change? a. weather balloons released …
B. chemical analysis of gases trapped in ice core samples
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4. when faced with a difficult chemistry concept, lisa thinks, \i need …
A. A growth mindset approach
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at high temperatures, ammonium nitrate decomposes into water vapor and …
Number of Hydrogen Atoms: 4, Number of Oxygen Atoms: 3, Number of Nitrogen Atoms: 2
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if 2 grams of substance a react completely with 3 grams of substance b,…
E. 5 grams of products are produced
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why do chemical reactions naturally occur in a balanced way? a. because…
A. because matter is conserved in chemical reactions
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microwave ovens are a fast and efficient way to cook or heat food. how …
D. Microwave ovens emit electromagnetic waves which are absorbed by molecules in the food causing thermal energy.
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a student takes notes in class. sound waves i created by a vibration a …
IA
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procedure 1. measure 200 ml of water using a graduated cylinder and car…
The reactants are \(\boldsymbol{\text{H}_2}\) (hydrogen) and \(\boldsymbol{\text{O}_2}\) (oxygen). ### 1. b.
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an acid would have a ph of ○ a. 5. ○ c. 9. ○ d. 11. ○ e. 13.
A. 5
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in an experiment, students first weigh their equipment, a flask and a b…
A. Mass is conserved during a chemical reaction.
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water being separated with an electric current into hydrogen and oxygen…
B. water is a compound.
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break out rooms think about the descriptions below. classify each item …
To solve this, we analyze each item based on properties of metals, nonmetals, and metalloids: ### 1. Shiny new Yeti cup Yeti cups are typically made of stainless steel (a metal al…
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which ball and stick model ... (blurry text, options a, b, c, d show mo…
D. The ball - and - stick model with one central gray atom bonded to four red atoms (representing the structure of sulfuric acid).
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a compound is the a. smallest particle of an element. b. partially blur…
B. substance made up of two or more elements (assuming the full option text is "substance made up of two or more elements" as the partial text suggests this is the correct definit…
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select the correct location on the image. the orbital diagram shows the…
The last electron will occupy the third (the right - most) \(3p\) orbital (the one with a single electron) to pair with the electron already present there. In the given diagram, i…
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select the correct answer. what is the chemical name of the compound kc…
D. potassium cyanide
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select the correct answer. a student has a piece of aluminum metal. whi…
E. It could be stretched into a thin wire.
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we can figure out what element this atom represent by counting the numb…
B. Boron
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14 multiple choice 1 point key: e⁻ electrons p protons n neutrons —— el…
The correct option is: Carbon (the option with "Carbon" text, assuming the options are listed as: Magnesium, Hydrogen, Nitrogen, Carbon; the last option here is Carbon).
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5 drag each label to the correct location on the diagram. each label ca…
To determine the correct representation of sodium fluoride (\( \text{NaF} \)) as an ionic compound, we analyze the electron transfer between sodium (\( \text{Na} \)) and fluorine …
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drag each tile to the correct location. categorize each hydrocarbon as …
- Saturated: 3 - methyloctane, propane, heptane - Unsaturated: cyclopentene, heptyne, propyne
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the diagram shows an oxygen molecule and a water molecule oxygen molecu…
C. Only the water molecule has different types of atoms.
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drag the tiles to the correct boxes. not all tiles will be used. the ox…
To solve this, we use the oxidation numbers to determine the correct compound names for the given formulas. ### For $\boldsymbol{MnCl_2}$: - Chlorine (Cl) has an oxidation number …
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1 select the correct answer. the elements beryllium, calcium, and stron…
D. Sr < Ca < Be
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select the correct answer. a scientist discovers a new type of polymer.…
D. It is made of large molecules with repeating units.
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question 11 (1 point) (02.02 lo) which of the following groups of eleme…
d. Group 14 ### Question 12
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question 8 (1 point) (02.03 mc) the table shows the charge on two unkno…
d. Particle A is present in the electron cloud, and Particle B is packed in the dense center.
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write out electron configurations for each of the following. only use y…
\(1s^2 2s^2 2p^6 3s^2 3p^2\) ### 2. \(K^+\) (Potassium ion)
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question 4 (1 point) (02.01 mc) the table compares the number of subato…
c. They have different charges but the same mass. ### Question 5
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select the correct answer. beryllium (be) and fluorine (f) combine to m…
A. beryllium fluoride
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question 1 (1 point) (02.01 lc) which scientist proposed the model of a…
a. John Dalton ### Question 2
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which of the following is a chemical change? burning natural gas meltin…
burning natural gas
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question 3 which of the following is not a characteristic of the solid …
A. particles are moving very fast
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question 2 which of the following is a homogeneous mixture? tea noodle …
tea
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drag each tile to the correct image. match each hydrocarbon class to it…
- First structure (with $\ce{NH2}$): amine - Second structure (with $\ce{OH}$): alcohol - Third structure (with $\ce{COOH}$): carboxylic acid - Fourth structure (with $\ce{Cl}$): …
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question 1 which of the following is an element? ○ tin ○ water ○ salt ○…
A. tin