Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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nuclear energy comes from either nuclear fission or nuclear fusion. in …
B. Nuclear fission splits an atom apart, while nuclear fusion fuses two atoms together.
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chemical energy is the energy stored in the chemical bonds that hold mo…
B. Breaking the molecular bonds in the food releases stored chemical energy.
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2. substance that releases hydroxide ions (oh) when dissolved in water;…
2. d. Bases 3. d. Solute 4. d. Polarity 5. b. Adhesion
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according to the law of conservation of energy, energy cant be created …
A. there is a limited supply of them and we can’t make any more.
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drag the right word to its definition any audible vibration; anything t…
sound
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drag the missing word into place energys from those chemical bonds, in …
Chemical
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drag over the word that goes best with the image neutron electron mecha…
electron
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drag the missing word into place. for the science fair, deshawn demonst…
chemical
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d. strongly basic 3) the ph of lemon juice is about 2.0, whereas tomato…
c. 100 times
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2) using a ph meter, you find the ph of an unknown solution to be 8.0. …
c. Weakly basic
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questions: 1) which of the following statements is not true? a. water i…
1) d. Water is the most abundant atom in Earth’s atmosphere. 2) (Assuming the intended correct option, e.g., "Weakly basic" if provided; based on pH 8.0, the solution is basic.)
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c. atoms want 8 protons d. atoms want 8 total particles 8. how do ionic…
8. B. Transferring electrons 9. B. A group of bonded atoms
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c. atoms want 8 protons d. atoms want 8 total particles 8. how do ionic…
8. B. Transferring electrons 9. B. A group of bonded atoms
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name: dexon williams date: sep.5,2025 period: 1 physical science unit 2…
1. C. Number of protons 2. B. Decreases 3. B. Electrons in the outer shell 4. The periodic table is arranged in order of increasing atomic number, with elements grouped by similar…
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which option describes the structure of the electron shells in a neutra…
The inner shell is complete with two electrons. The outer shell is incomplete with four electrons.
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why is carbon said to provide a \backbone\ in many molecules? (1 point)…
Carbon atoms can form chains and branches with each other, and other atoms can attach to these
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which kind of bond would occur between sodium (na, group ia) and chlori…
A. ionic
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between which types of elements do ionic bonds occur, and how do electr…
metals and nonmetals, electrons transferred
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3. why is it easy to separate mixtures? 4. what is the difference betwe…
3. Because substances in mixtures are physically combined and retain their properties. 4. Homogeneous: uniform composition; Heterogeneous: non - uniform composition. 5. A homogene…
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metallic bonds are responsible for many properties of metals, such as c…
The bonds can shift because valence electrons are held loosely and move freely.
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a. what is the difference between homogenous and heterogenous mixtures?
A homogeneous mixture has a uniform composition and properties throughout, while a heterogeneous mixture has a non - uniform composition with visible different parts or phases.
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read the same passage and think about what energy transformation took p…
chemical potential energy... gravitational potential energy
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what is the primary definition of solubility? the ability of a substanc…
The ability of a substance to dissolve in another and form a solution
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3. you forgot to dry the bread knife when you washed it and reddish bro…
3. Chemical change 4. Physical change 5. Chemical change 6. Chemical change 7. Physical change 8. Physical change 9. Physical; Chemical 10. Chemical change Part C: 1. T 2. T 3. T …
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a sample of sand is taken at random from the shore of a lake. the table…
The proportion of quartz will be greater than 0.61
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select the correct answer. which of these actions is an example of chem…
C. Oxygen in air reacts with iron content in rocks, causing them to change color
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read the paragraph, then choose the word that best completes the senten…
B. examined
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chemical energy can be converted into mechanical energy through which s…
D. Engine system
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scientist albert einstein is revered as one of the greatest physicists …
D. intersected
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define corrosion in special installation
Corrosion in special installations is the deterioration of materials in specific set - ups due to chemical or electrochemical reactions with the environment.
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lets practice. you must show your dimensional - analysis set - up to re…
1. Approximately 120.3 yards 2. Approximately 17.0 liters 3. 5700 milliliters 4. 6022.5 days 5. 2.5 kilometers 6. 3.25 pounds 7. 30000000 grams 8. 4171200 feet 9. 5 centimeters 10…
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what is the correct order of processes in the accretion of planetesimal…
Atoms and molecules are added to dust grain, masses of matter form around dust grain, and masses of matter collide.
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matrix organizational structures were first developed in select one: a.…
B. the aerospace industry.
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causes are not an origin of intellectual disabilities. a. organic b. en…
C. Adaptive
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water is considered a: a. pure substance → element b. pure substance → …
B. Pure substance → Compound
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12. the element titanium occurs naturally as five different isotopes: ^…
$47.86$ amu (rounded to two - decimal places)
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19. list three positive uses of nuclear chemistry. 20. identify the fol…
19. Medical imaging, power generation, cancer treatment 20. Left: Fusion; Right: Fission 24. Fusion: Light nuclei combine, high temp. Fission: Heavy nucleus splits, releases neutr…
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read the poem. skimming the bottom in the company of toes, i observe th…
D. abcd
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resonance structures and formal charges go back to the resonance struct…
For SCN⁻: The dominant resonance structure has a triple bond between C and N and a single bond between C and S, with a formal charge of - 1 on N. For N₂O: The dominant resonance s…
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a piece of pure aluminum foil is cut to dimensions of 5.00 cm x 8.00 cm…
$8.42\times10^{4}$
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read this excerpt from sea fever by john masefield. and the wheels kick…
The free form flows cheerfully and unpredictably.
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which sensory receptors detect when your shoes are too tight? (1 point)…
C. mechanoreceptors
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a person who has the condition cipa is unable to feel pain or temperatu…
thermoreceptors and mechanoreceptors
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study guide for nuclear chemistry 1. what determines if an atom will be…
1. Neutron - to - proton ratio 16. $^{230}_{90}Th ightarrow^{226}_{88}Ra + ^{4}_{2}He$ 17. $^{8}_{3}Li ightarrow^{8}_{4}Be+^{0}_{- 1}e$ 18. Protactinium - 234 ($^{234}_{91}Pa$)
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study guide for nuclear chemistry 1 what determines if an atom will be …
1. Unstable neutron - proton ratio 2. alpha, beta, gamma 3. b. beta particles 4. a. alpha particles 5. c. gamma rays 6. a. alpha particles 7. a. alpha particles 8. c. gamma rays 9…
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a person who has the condition cipa is unable to feel pain or temperatu…
None of the above options are correct. The main affected receptors are nociceptors (for pain) and thermoreceptors (for temperature). If we have to choose from the given options, t…
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consider the following densities of known metals. metal density (g/cm³)…
rhodium
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if the density of gold is 19.3 g/cm³, what is the mass of a gold bar (i…
405
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question 11 of 20 what is the most important focus area for the integum…
UV radiation exposure
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in 1896, swedish scientist svante arrhenius claimed that the burning of…
1. B. $H^{+}$ 2. B. $OH^{-}$
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the sabatier reaction is used on space missions to remove carbon dioxid…
- Carbon dioxide ($CO_{2}$) has a coefficient of 2: False - Hydrogen ($H_{2}$) has a subscript of 4: False - Methane ($CH_{4}$) has a subscript of 4: True
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problem 3 different isotopes of an element have the same number of neut…
FALSE
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two versions of an element with different numbers of neutrons are calle…
isotopes.
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4. a chemist has 70 ml of a 50% methane solution. how much of a 80% sol…
35 mL ### Problem 5
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question 1 1 pts your legs provide __________ energy to propel you forw…
Question 1: B. Mechanical Question 2: B. Suspension Question 3: D. Polar covalent; Hydrogen
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use the picture of the test - tube to answer questions 1 - 2. 1. the li…
2. B. It would sink to the same level as the green liquid and stay there because it is the same density as the green liquid 3. more than one 4. A. carbon dioxide 5. (No models sho…
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answer the following questions to check your understanding of the lesso…
3. A. Water is a molecule, B. Water is a compound 4. C. The forces holding the atoms together are represented differently 5. Atoms; Bonds; Structures 6. Molecule; Extended structu…
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which of the following can be carcinogens? a pathogens b radiation c ch…
D. All of the above
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complete the text with the correct pair of words. could you ____ these …
take...a part
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which of the following can be carcinogens? a pathogens b radiation c ch…
d. All of the above
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lets focus on logos logos is an appeal to logic; it is a means of convi…
1. Effective? Yes. Explanation: Follows logical syllogism. 2. Effective? No. Explanation: Based on false generalization. 3. Effective? Yes. Explanation: Applies logical principle.…
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a fictional element, kendrickium, has three fictional isotopes (gray, r…
$31.31$
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isaiah determines that the total mass of all 128 atoms is 41.6327 g. wh…
0.3253 g
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question 1 1 p select all true statements. the electron has a relative …
The electron has a relative charge of 1-. An electron is extremely small. The electron is emitted by atoms in a cathode ray tube. The electron from a gold atom is the same as one …
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compare the trends for atomic radius with the trend for atomic mass. ho…
Similarities: Both generally increase down a group. Differences: Across a period, atomic radius decreases while atomic mass increases.
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exercise 6 > write this, that, these, or those in each blank. example: …
Exercise 6: 1. those 2. that 3. those 4. that 5. that 6. these 7. this 8. these Exercise 7: 1. C; those; C; C 2. these; C; those
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the davis family grows organic vegetables to sell at a local farmers ma…
- an increase in the cost of farm equipment - a rise in demand for organic produce - an increase in customers at the market
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what ion concentration does the ph scale measure? question 6
Hydrogen - ion ($H^+$) concentration
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electrons are important to determining reactivity. explain why
Electrons, particularly valence electrons, are crucial because chemical reactivity depends on their transfer or sharing to achieve stable electron configurations.
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43 of 63 concepts completed fill in the blank question this image shows…
fatty acid
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which of the following medications requires special disposal because it…
A. A partially used vial of chemotherapy medication
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what property of water allows it to stick/be attracted to itself (other…
B. hydrogen bonds
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which two types of particles are present in equal numbers in an atom, b…
protons & electrons
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buffers are bases that cause the ph of blood to increase. buffers preve…
1. Buffers prevent small amounts of acid or base from changing the pH of blood. 2. Move the protons and neutrons to a small space in the center.
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the diagram shows the structure of a water molecule. which allows the t…
covalent bonds formed by shared electrons between atoms
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review and discuss: what did we learn about the periodic table and chem…
We learned the periodic table organizes elements by atomic number and shows properties, and chemical formulas represent substance composition. To determine the number of atoms in …
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in a chemical reaction, which event always occurs as the reaction proce…
the rearrangement of electrons to break or form chemical bonds
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the elements sodium and chlorine react to form the chemical compound so…
A. very different
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refer to the passage. the results of the experiment most strongly suppo…
D. Lipid molecules are non - polar because they repel water molecules, which are polar.
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what do formulas tell you about substances?
Chemical formulas tell you the types and numbers of atoms in a substance, as well as the ratio of elements in a compound.
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what even changes an atom into an ion? * choose sharing of electrons wi…
gain or loss of electrons with another atom
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what is the effect of an enzyme on the energy of a chemical reaction? *…
Enzymes decrease the activation energy of the reaction.
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video: chemical formulas what do formulas tell you about substances? us…
a. 2 b. Molecules of $CCl_4$ c. 4 d. Chlorine (Cl)
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multiple choice question if all carbons in a fatty acid chain are bound…
B. saturated
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the diagram shows water at the molecular level. what property of a wate…
polarity of the molecule, which involves a slightly negative oxygen atom and slightly positive hydrogen atoms
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37 of 63 concepts completed fill in the blank question this image shows…
fatty acid
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household bleach has a ph between 12 & 13. from this information, which…
The solution is basic, meaning it has fewer hydrogen (H⁺) ions than hydroxide (OH⁻) ions.
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fill in the blank question in terms of saturation, solid fats are more …
saturated
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rupert develops a mental pattern for what \maleness\ and \femaleness\ m…
C. gender schema
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16. ionic bonds involve the ______ of electron a destruction b sharing …
d. Transfer
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15. covalent bonds involve the __________ of electrons a producing b ex…
C. Sharing
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14. an example of a covalent bond is this. a iron (fe) b water (h2o) c …
B. water (H₂O)
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fill in the blank question the disaccharide that is common table or can…
sucrose
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instructions: write the quantity of atoms of each element opposite the …
19. \(Sn = 8\), \(Cl = 32\) 21. \(As = 3\), \(Br = 9\) 23. \(S = 1\), \(Br = 2\) 25. \(Mg = 15\), \(P = 10\), \(O = 40\) 27. \(N = 10\), \(O = 20\) 30. \(Kr = 2\), \(Cl = 10\) 31.…
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instructions: write the quantity of atoms of each element opposite the …
19. \(Sn = 8\), \(Cl = 32\) 21. \(As = 1\), \(Br = 3\) 23. \(S = 0\), \(Br = 10\) 25. \(Mg = 15\), \(P = 10\), \(O = 40\) 27. \(N = 10\), \(O = 20\) 29. \(P = 14\), \(O = 35\) 30.…
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15. calculate the mass of element x. then use the periodic table to ide…
28.09 amu (rounded to two decimal places)
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use the periodic table to identify each element described. 13. atomic n…
13. Terbium (Tb) 14. Platinum (Pt)
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fill in the blank question the fact that most compounds of this chemica…
Carbohydrates
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multiple choice question common table sugar is called ______. sucrose g…
A. sucrose
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12. determine the average atomic mass for chlorine: 1. mass of 34.969am…
$35.453$ amu