化学
化学反应、化学计量、分子结构与元素性质。
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question 21 1.66 pts glucose (c₆h₁₂o₆) element compound mixture element…
B. Compound
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question 19 1.66 pts salt and pepper element compound mixture
Mixture
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type the correct answer in the box. mention the term food is grown natu…
Organic
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in the missing terms, then add examples. word bank: particles, pure sub…
- First blank: Atom - Second blank: Molecule - Third blank: Smallest - Fourth blank: Mass; Space - Fifth blank: Pure substances - Sixth blank: Elements - Seventh blank: Compounds …
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question 18 1.66 pts air element compound mixture
Mixture
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vegetable soup element compound mixture © the science duo element compo…
C. Mixture
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question 16 1.66 pt rust (fe₂o₃) element compound mixture element compo…
B. Compound
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question 15 1.66 pts mercury (hg) element compound mixture element comp…
Element
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classify the chemical equations as being balanced or not balanced. 2co …
| Balanced | Not Balanced | | ---- | ---- | | $2CO + 2NO=2CO_2+N_2$, $H_2CO_3=H_2O + CO_2$ | $6CO_2 + 6H_2O=C_6H_{12}O_6+O_2$, $2Cu+O_2 = CuO$ |
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question 14 1.66 pts helium (he) element compound mixture element compo…
Element
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which three statements are true about all alloys? theyre made from meta…
They're harder than the pure metals they're made of. They're good conductors of electricity. They have a metal as their main component.
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question 13 1.66 pts blood sample1 element compound mixture element com…
Mixture
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ecm task cards started: oct 10 at 10:11am quiz instructions question 12…
Mixture
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question 11 1.67 pts hydrochloric acid (hcl) warning acid element compo…
Compound
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what does the charge on the top right hand corner of the element tell u…
The difference in the number of electrons.
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drag the tiles to the correct boxes to complete the pairs. match the ch…
The reaction has at least two reactants and one product → synthesis The reaction has one reactant and at least two products → decomposition Oxygen is one of the reactants, and a l…
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multiple - choice question isotopes ... have different masses but the s…
have different masses but the same chemical properties
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multiple - choice question mass number is the number of protons and neu…
T
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select the correct answer from each drop - down menu. hydrogen can be c…
decomposing
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question 10 1.67 pts carbon dioxide (co₂) element compound mixture elem…
B. Compound
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multiple - choice question what is atomic mass? the mass of the total n…
The mass of the total number of protons plus the total number of neutrons averaged across all the isotopes that exist.
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salad dressing element compound mixture element compound mixture
Mixture
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2. a chemist started an experiment with 5 grams of a chemical. the chem…
B. $c = 5 - 0.01t$
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select all the correct answers. which of these processes are chemical r…
boiling an egg, vegetables rotting
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does the atomic number change as an atom gains more neutrons? yes, sinc…
No, since the atomic number is based on the number of protons.
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select the correct answer. nitrogen (n) and hydrogen (h) react with eac…
B. 1 to 3
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salt water element compound mixture element compound mixture
C. Mixture
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question 5 1.67 pts gold (au) element compound mixture element compound…
A. Element
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question 4 1.67 pts water (h₂o) element compound mixture element compou…
Compound
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select the correct answer. in a given chemical reaction, the energy of …
A. Energy is absorbed in the reaction
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a substance that consists of 2 or more elements combined in a set ratio…
B. Compound
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magnesium reacts with nitrogen to give magnesium nitride. the stoichiom…
C. 3,1,1
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made up of 2 or more substances that are together, but not chemically c…
C. Mixture
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a pure substance that cannot be broken down chemically. element compoun…
Element
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multiple - choice question what is silvers atomic name? ag - shiny gray…
A. Ag - Shiny gray stuff
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select all the correct answers. which of these are examples of mixing a…
- removing seed casings from grains - a soda bottle bubbling when it is opened - removing salt from seawater
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select the correct answer. which law represents a balanced chemical equ…
C. law of conservation of mass
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select the correct answer from each drop - down menu. the chemical name…
Silicon, Oxygen
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multiple - choice question the number of protons determines the charge …
the identity of an atom.
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select the correct answer katrina inserts a key into her cars ignition.…
B. activation energy
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multiple - choice question what is inside the nucleus? protons + electr…
B. Protons + Neutrons
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multiple - choice question how did einstein \discover\ atoms? by feelin…
B. By studying another scientist's observation about pollen moving for no apparent reason.
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select the correct answer from each drop - down menu. burning magnesium…
First drop - down: synthesis Second drop - down: oxygen
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select the correct answer from each drop - down menu. what types of ene…
Activation energy; chemical energy
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select the correct answer from each drop - down menu. what types of ene…
First dropdown: Activation energy Second dropdown: Chemical energy
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categorize the examples based on whether they describe a physical chang…
Physical Change: wax melting from applied heat, grinding wheat to make flour, adding copper with gold to make jewelry Chemical Reaction: growth of a seed into a seedling, making c…
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qse 1 retest 25 - 26 ca(oh)₂ + h₂so₄ → caso₄ + 2h₂o 74 g ? 136 g 36 g w…
98
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drag each tile to the correct box. not all tiles will be used. a chemic…
higher energy of reactants, transition state, lower energy of products
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which of the following shows the correct atom count for sulfur on the r…
3 atoms of sulfur on the reactant side
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select the correct answer from the drop - down menu. if 56 grams of car…
32
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particle diagrams - showing solid, liquid, gases of the same substance …
1. Chemical Formula: $O_2$, Element 2. Chemical Formula: $AlF_3$, Compound 3. Chemical Formula: $NaCl, Au$, Mixture 4. Chemical Formula: $SO_3$, Compound 5. Chemical Formula: $H_2…
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to solve stoichiometry problems, you must always calculate numbers of m…
Part A: mass of $AgCl = 28.0\ g$ Part B: Value = $0.0282$, Units = $mol/L$
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select the correct answer. the chemical formula for carbonic acid, a co…
A.
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qse 1 retest 25-26 which of the following statements is true according …
The total mass of reactants is equal to the total mass of the products.
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website #3 https://oceanconservancy.org/blog/2023/06/08/five - things -…
1. HABs can reduce oxygen levels through decomposition processes. 2. HAMS can harm seagrass by releasing toxins or altering the chemical environment. 3. Juvenile salmon and oyster…
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if it is a pure substance, state whether it is an element or a compound…
| Material (formula or ingredients listed) | Is it a pure substance or mixture? | For pure substances: Is it an element or a compound? | For mixtures: Is it homogeneous (solution)…
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you start with 200 g of thallium 207. after 20 minutes, there is only 1…
5
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in this reaction _. ab + cd → ac + bd potential energy of molecules rea…
heat has been released to the environment
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how long does it take po to turn into pb? * 4.5 days 24 days 24 billion…
24 days
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how long does it take u to turn into th? * 3 billion years 24 days 4.5 …
4.5 billion years
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which of the following statements about equilibrium of chemical reactio…
C. A reaction that is at equilibrium is not capable of doing any work.
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what percent of boron would be boron - 11 * 40% 80% 20% 60% this is a r…
1. B. 80% 2. D. 10.8 amu
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what is the isotope of name of boron with 5 protons and 6 neutrons * bo…
1. D. Boron - 11 2. A. 20% 3. B. 80%
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what element has 5 protons * oxygen nitrogen carbon boron what is the i…
First question: D. Boron Second question: D. Boron - 10
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what is mass number * protons + electrons + neutrons protons + neutrons…
1. B. protons + neutrons 2. A. 1
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for mg 2+ with 13 neutrons what is the isotope name * magnesium-12 magn…
For the isotope name question: Magnesium - 25 For the number of electrons question: No correct option among given ones (should be 10)
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for mg 2+ with 13 neutrons what is the mass number * 54 22 56 13 25 100…
25
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for mg 2+ with 13 neutrons what is the number of protons * 40 56 100 13…
12. Option: 12
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for mg 2+ with 13 neutrons what is the atomic number * 78 12 53 10 131 …
12
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for iodine - 131 with a chemical symbol and net charge of i - what is t…
54
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for iodine - 131 with a chemical symbol and net charge of i - what is t…
78
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for iodine - 131 with a chemical symbol and net charge of i - what is t…
131
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for iodine - 131 with a chemical symbol and net charge of i - what is t…
53
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for iodine - 131 with a chemical symbol and net charge of i - what is t…
53
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for an element with 44 protons, 56 neutrons, and 40 electrons what is t…
Ru 4+
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lab safety stations part 1: lab safety basics: directions: find the \ge…
1. False. Closed - toed shoes should be worn in the lab. 2. True 3. True 4. True 5. True 6. False. First - aid equipment should be in a fixed location. 7. True 8. False. Unused ch…
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for an element with 44 protons, 56 neutrons, and 40 electrons what is t…
100
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for an element with 44 protons, 56 neutrons, and 40 electrons what is t…
For the isotope name question: Ruthenium - 100 For the atomic number question: 44 (but 44 is not among the given options for the atomic number question, indicating an error in the…
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for na+ with a mass number of 22 what is the number of electrons * 1 po…
10 (corresponding to the option with value 10 in the list provided in the question)
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for na+ with a mass number of 22 what is the number of neutrons * 10 53…
11. Option with 11 is the correct answer among the given choices.
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for na+ with a mass number of 22 what is the number of protons * 10 11 …
11
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for na+ with a mass number of 22 what is the isotope name. * sodium-10 …
For the first question: Sodium-22 For the second question: 11
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in chemical reactions, atoms are rearranged to form new substances, but…
mass
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a student writes the chemical equation for rusting: 4fe + 3o₂ → 2fe₂o₃ …
The total number of each type of atom is equal on both sides.
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started: oct 10 at 2:32pm quiz instructions question 7 10 pts when meth…
The number of carbon, hydrogen, and oxygen atoms stays the same before and after the reaction.
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question 6 during photosynthesis, plants use carbon dioxide and water t…
conservation of mass
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two solutions are mixed and react to produce the solid precipitate agcl…
The mass remains constant.
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an equation for a chemical reaction is shown. naoh + hcl → nacl + h₂o. …
Two hydrogen atoms are in the reactants, and two hydrogen atoms are in the products.
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started: oct 10 at 2:32pm quiz instructions question 3 10 pts what is t…
D. 70 grams
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a chemical equation is shown. 2h₂o₂ → 2h₂o + o₂ liquid hydrogen peroxid…
The total number of atoms in the hydrogen peroxide molecules is equal to the total number of atoms in the liquid water and oxygen gas molecules.
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a reaction occurs that results in a molecule with two atoms of the same…
C. $N_2$
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which statement best explains why carbon bonds to four hydrogen atoms t…
Hydrogen shares one valence electron with carbon, and oxygen shares two valence electrons.
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which atom generally obtains a stable configuration by sharing electron…
phosphorus (P)
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how many valence electrons do most stable atoms have? (1 point) one eig…
B. eight
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4. the food that an organism consumes is what type of energy? a. electr…
B. chemical
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based on location in the periodic table, which element has chemical pro…
C. fluorine (F)
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part 2 directions: using the element symbols of the elements of the per…
# Explicación paso a paso: ## Paso 1: Identificar símbolos de elementos para la letra 'J' No hay un símbolo de elemento que sea exactamente 'J'. Pero podemos considerar Jodino (Io…
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to find density of an element, i should use the following equation... v…
mass divided by volume
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according to the texts introduction to sensation and perception, male s…
B. absolute
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phases of matter phases\tdescribe (and tell the speed of how fast matte…
| Phases | Describe (and tell the speed of how fast matter moves) | How are the molecules arranged (close, far, etc) | | ---- | ---- | ---- | | Solid | Molecules vibrate slowly in…