化學
化學反應、化學計量、分子結構與元素性質。
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select the correct answer from each drop - down menu. the chemical name…
Silicon, Oxygen
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select the correct answer. what law represents a balanced chemical equa…
C. law of conservation of mass
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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 katrina inserts a key into her cars ignition.…
B. activation energy
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food speaks: persuasion on your plate think about a food product, meal,…
To answer this question, first choose a food product, meal, or snack. For example, if we consider a well - known brand of organic yogurt. 1. Ethos: The yogurt is promoted by a wel…
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select all the correct answers. which of these processes are chemical r…
Boiling an egg, vegetables rotting, iron rusting
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examine the chemical equations as being balanced or not balanced. co + …
Balanced: $H_2CO_3 = H_2O+CO_2$ Not Balanced: $CO + NO=CO_2 + N_2$, $CO_2+H_2O = C_6H_{12}O_6+O_2$, $Cu + O_2=CuO$
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drag the tiles to the correct boxes to complete the pairs. identify the…
- Michael uses a car that burns fossil fuels. -> combustion reaction - Alan grows tomatoes on his farm. -> photosynthesis - Lisa eats eggs for breakfast. -> respiration
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simulation: heating a solid (schoology link: javalab specific heat simu…
1. **Heating a Solid - Cold**: Particles vibrate in fixed positions. 2. **Heating a Solid - Heating up**: Vibration amplitude of particles increases. 3. **Heating a Solid - Very h…
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the image shows the reaction of methane. which equation represents this…
E. $CH_4+2O_2 = CO_2 + 2H_2O$
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define the two types of carbohydrates important to proper nutrition and…
Simple carbohydrates: are quickly digested single - or double - sugar molecules. Sources: apples, table sugar. Complex carbohydrates: are long chains of sugar molecules, digested …
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nitrogen (n) and hydrogen (h) react with each other to produce ammonia …
B. 1:3
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8 if the haudenosee women who lead local clans believe their sachems ar…
B. Checks and balances
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(2) the idea that matter cannot be created or destroyed is not new. how…
The word "meticulous" suggests that Lavoisier's work was very careful and precise.
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the structure of atoms complete the table sub - atomic particle symbol …
| Sub - atomic Particle | Symbol | Location in the atom | Mass of particle | | ---- | ---- | ---- | ---- | | Proton | $p^+$ | Nucleus | Approximately 1 amu | | Neutron | $n^0$ | N…
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blank is/are the most frequent type of consumer fraud complaint. ○ comm…
B. Identity theft
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minerals are inorganic substances that the body cannot produce on its o…
T
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which country ranks second behind only the united states in losses asso…
B. Nigeria
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16 multiple choice 1 point what is the atoms chemical symbol (dc)? li s…
Ca
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question 8 1 pts blank is/are the most widely reported type of internet…
Online auction fraud
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15 numeric point. what is the atoms charge (chg)? answer. p⁺ = 20, n⁰ =…
2
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determine the components of the atomic symbol using the number of proto…
41
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question 7 1 pts the igerian 419\ scheme is primarily what type of comp…
D. Confidence scheme
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regina is writing an argument against adding fluoride to the citys drin…
A. The Food and Drug Administration stated in 2000 that fluoride is a drug subject to regulation when it is "used in the diagnosis, cure, mitigation, treatment, or prevention of d…
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corporate espionage schemes may target which of the following? ○ custom…
C. all of these
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question 1 1 pts eutralization techniques\ may be defined as enforcemen…
ways that Internet fraud perpetrators overcome shame and guilt associated with fraud schemes.
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true or false - protons and neutrons have about the same mass. true - t…
True - They have about the same mass
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which of the following is a covalent molecule? select all that apply a …
A. $H_2O$, C. $O_2$
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what is the atomic number of rhodium? 45 102.90550 57.9055
45
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a neutral atom of chlorine has 17 protons and 18 neutrons. how many ele…
C. 17
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a water molecule is held together by ____ covalent bonds, meaning there…
e. 2, 4
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in covalent bonds, the atoms that form bonds a become ions. b transfer …
C. may both be the same element.
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which statement(s) is/are true about covalent bonds? select all that ap…
B. Covalent bonds can form between atoms of different elements. D. Covalent bonds can form between atoms of the same element. E. Covalent bonds can form between two nonmetal atoms.
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which of the following represent compounds? select all that apply a o₂ …
b. $CO_2$, d. $NaCl$
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which of the following represents a covalent molecule? select all that …
A. $O_2$ B. $CO_2$ C. $Cl_2$
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complete the sentence by using word ion, molecule, atom or element. a(n…
molecule
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13 numeric 1 point what is the atoms atomic number (z)? answer p⁺ = 20 …
20
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12 numeric 1 point how many electrons (e⁻) are in the atom? answer 31 p…
18
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how many neutrons are shown in this image? 2 5 3
<Count the number of neutrons in the nucleus of the provided atomic - model image and provide that number as the answer. Since the image is not clear enough to count accurately in…
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determine the number of protons, neutrons, and electrons in the atom us…
16
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which of the following represents a covalent molecule? select all that …
b. Cl₂ d. H₂O e. O₂
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elements that form diatomic molecules include _. a oxygen b hydrogen c …
D. two of the above
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determine the number of protons, neutrons, and electrons in the atom us…
15
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elements that form diatomic molecules include _________. a carbon b oxy…
B. oxygen
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which of the following is not a compound? * baking soda salad dressing …
1. salad dressing 2. a compound can only be separated by chemical means 3. capitalized
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which of these is not a pure substance? h2o lemonade the element gold
lemonade
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what happens when two or more atoms chemically bond together to form a …
A. A new, pure compound is made.
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if you compare the mass of a substance before and after a chemical chan…
The mass will stay the same.
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which option is an example of a chemical property? density color reacti…
C. reactivity
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what sign of chemical change is occurring when a banana is rotting? new…
new color
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why is boiling an egg a chemical change? it is a process that cannot be…
It is a process that cannot be reversed.
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which option is an example of a chemical property? density melting poin…
flammmability
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which option is an example of a physical property? toxicity rusting abi…
state of matter
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which option is an example of a physical property? rusting ability melt…
Melting point
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what is an example of chemical change? burning mass color
burning
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which of the following is a heterogeneous mixture? * air steel water wi…
First question: soil Second question: salt dissolved in water
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why is melting wax not considered a chemical change? new substances wer…
It is a state of matter change; there is no new substance.
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when you mix salt into a glass of water until it disappears, the salt s…
salt
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which properties change the composition of a substance? chemical and ph…
chemical properties
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select the characteristic(s) that make water an excellent solvent. it c…
It can make hydrogen bonds with other polar substances to pull it apart. Water is a polar molecule.
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which of the models is an example of a solution?
The third model (the beaker with uniformly - colored red liquid) is an example of a solution.
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what can mixtures be composed of? mixtures can only be composed of soli…
Mixtures can be composed of solids, liquids, and gases.
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multiple choice 8.3 points which statement best describes a physical pr…
A physical property can be measured without changing the chemical bonds & electrons of the material.
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when balancing a chemical equation, which of the following can be chang…
the coefficients
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which of the following is an example of a homogeneous mixture? rocky ro…
tea
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which is a physical change? folding paper burning paper baking brownies…
Folding paper
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when you blow up a balloon, what is happening to the balloon? physical …
Physical change
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which is not a pure substance?
Milkshake
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which of the following examples is not considered a pure substance? a w…
C. fruit punch
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a bath bomb is a solid sphere made of a weak base and a weak acid. when…
Increase the water temperature, which increases the solubility of the bath bomb - dissolving it more quickly
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which of the following choices is an example of a chemical change? melt…
a rusty car
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if 40g of sodium (na) completely reacts with 60g of chlorine (cl₂), wha…
100 g
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which of the following are signs of a chemical change? changes in odor,…
changes in odor, color, and temperature
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the production of a new substance commonly indicates what type of chang…
A. A chemical change
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according to the law of conservation of matter, the number of fe atoms …
4
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what is an example of chemical change? mass color burning
burning
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the strong intermolecular forces in water lead to strong surface tensio…
Water would have a harder time moving from the roots to the leaves due to weakened capillary action. Plants would be more prone to water - loss through evaporation from the leaves…
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sally is doing an experiment in chemistry class where she mixes two sub…
It is an endothermic reaction
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when you mix salt into a glass of water until it disappears, the salt s…
B. salt
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balance the following the chemical equation: _na₂o + _cabr₂ → _nabr + _…
1:1:2:1
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what is the best definition of a mixture? a mixture is when elements co…
A mixture is a combination of two or more substances.
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water acts like a magnet, meaning opposite charges attract. select the …
The negative oxygen atom of one water molecule would stick (bond) to the positive hydrogen atom of a second water molecule.
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what type of mixture is composed of different molecules that are evenly…
homogeneous
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how can you tell if a physical change has occurred? the change creates …
The composition of the substance has not changed.
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use the equation to answer the question. ch₄ + 2o₂ → co₂ + 2h₂o if you …
There is an extra $O_2$ molecule left over
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which is a physical change? burning paper rusting iron folding paper ba…
C. Folding paper
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all of the following are physical properties of matter except mass volu…
1. Reactivity is not 2. matter 3. compound
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how many atoms of carbon (c) are present in the reactants of the follow…
7 atoms
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which of the following equations shows a chemical change? (1 point) ○ $…
$C_{3}H_{8}+5O_{2} ightarrow3CO_{2}+4H_{2}O$
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10. c₃h₅oh + o₂ → co₂ + h₂o 11. mg + hcl → mgcl₂ + h₂ 12. h₂so₄ + naoh …
10. $\mathrm{C}_2\mathrm{H}_5\mathrm{OH}+3\mathrm{O}_2 ightarrow2\mathrm{CO}_2 + 3\mathrm{H}_2\mathrm{O}$ 11. $\mathrm{Mg}+2\mathrm{HCl} ightarrow\mathrm{MgCl}_2+\mathrm{H}_2$ 12.…
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looking at the periodic table, determine the number of valence electron…
5 valence electrons
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balance the following the chemical equation: _ mg + _ f₂ → _ mgf₂ (1 po…
1:1:1
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what makes up a compound? non - bonded atoms hanging out in a solution …
chemically - bonded atoms
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are the following examples of chemical or physical changes? (8 points) …
A silver spoon tarnishing: Chemical change Blowing a dandelion: Physical change Building a sand castle: Physical change Toasting bread: Chemical change
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which of the following examples is not considered a pure substance? a w…
fruit punch
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which of the following in an example of a homogeneous mixture? * air or…
1. air 2. carbon dioxide 3. cannot be broken down; found on the periodic table
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methane (ch₄) is a gas that is found in small - quantities in earths at…
A. Covalent
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choose the correct answer. which is a pure substance? ice cream sundae …
Salt
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what is made of only one kind of matter and has definite properties? a …
a pure substance
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5. categorization 8.7 points sort the statements based on the category …
Loses Energy: freezing, condensation, molecules move slower & closer together Gains Energy: evaporating, melting, molecules move faster & further apart