Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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what is cohesion? another word for molecules when a substance dissolves…
D. attraction between the same molecules (assuming the last option is labeled D; if labels are A - D in order, the last option is D with text "attraction between the same molecule…
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what is adhesion? the attraction between two different kinds of molecul…
A. the attraction between two different kinds of molecules
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the substance that does the dissolving (ex:water) options: solution, so…
B. solvent (assuming the options are labeled as A. solution, B. solvent, C. solute, D. weathering; if labels differ, the correct option is the one with "solvent")
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water is the universal solvent because it can dissolve many polar and c…
it can dissolve many polar and ionic compounds
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what caused our sun to ignite and become a star? ○ fusion reactions wit…
C. Gravity
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a student wants to test how water temperature affects the solubility of…
**Claim**: The solubility of oxygen gas in water decreases as the temperature of water increases. **Evidence**: From the graph, at 5°C, oxygen solubility in water is about 14 mg/L…
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which piece of lab equipment would be best to measure 13.7 ml of liquid…
D. 25 mL graduated cylinder
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classify the following descriptions as safe behavior in a science lab o…
To solve this, we analyze each statement based on lab safety principles: ### Safe Behavior in a Science Lab: - **Hands are thoroughly dried before touching an electrical outlet or…
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a student hypothesizes that the solubility of a particular solute in wa…
C. Measuring the solubility of the solute at five different temperatures
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the following results of a scientific study on water were found in a ch…
C. temperature (assuming the options are labeled as A. vapor pressure, B. molar mass, C. temperature, D. melting point)
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question: when does a molecule become an ion? answer options: select on…
When it loses or gains an electron
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challenge question!!! background knowledge: when any mass is pulled or …
$9.8 \, \text{m/s}^2$
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the picture shows a filtration process. which of these is least likely …
Solid particles
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question 5 (10 points) which pair best describes the physical process t…
c. Canadian Shield and glaciation
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melting point results (°c) trial | group 1 | group 2 | group 3 | group …
Group 2
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what is the density of an aqueous solution that has a mass of 10.081 g …
0.806
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magnesium atom magnesium ion atomic number: mass number: protons: neutr…
To solve this, we analyze each element (Magnesium, Aluminum, Phosphorus, Sulfur, Chlorine) for atoms and ions: ### 1. Magnesium (Mg) - **Atomic number** (protons): \( 12 \) (Mg is…
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question: when two atoms transfer electrons, the bond formed is called …
B. ionic
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which option shows the following answer rounded to the correct number o…
\( 1.47 \times 10^{-2} \) (corresponding to the option "1.47 × 10⁻²")
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question: waters unique properties of adhesion and cohesion are a resul…
C. hydrogen bond
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question: which of the following are present in the nucleus of an atom?…
A. Protons and neutrons
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the halogens are the elements of group 17 on the periodic table. haloge…
C. salt
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exam lesson name: the nature of science, the chemistry of l ecology exa…
A. They don't react with other elements to form compounds.
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round the following operation to the correct number of significant figu…
1.0 g/mL
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transition metals can be found in families 3 through 12 on the periodic…
A. they are brightly colored and are often used to make pigments
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the noble gases include helium, neon, argon, krypton, xenon, and radon.…
D. They are normally unreactive with other elements.
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the periodic table is shown below. helium (he), neon (ne) and argon (ar…
C. xenon (Xe)
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question 1 of 20 : select the best answer for the question. 1. in the n…
C. The atom determines the chemical property of an element.
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wilson, makyla dtal- ch- term 1 - unit 1 assessment - 25-26 2 of 26 how…
The number of significant figures in \(0.02034\)g is 4, so the correct option is the one with 4 (assuming the option with 4 is one of the choices, like if the options are O 6, O 3…
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question 1. select all statements that correctly explain why safety gla…
- Chemical spills, splashes, or reactions can occur unexpectedly, even from nearby experiments. - Flying debris or broken glass from accidents can cause eye injuries. - Wearing go…
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which of these properties is the best one to use for identification of …
B. the number of protons in the atomic nucleus
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which is a component of john daltons atomic theory? the ratio of atoms …
C. An atom is a small particle that cannot be broken down.
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the mass number of a chromium atom is 52 and it has 24 protons. how man…
28
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how are isotopes defined? forms of different elements that have the sam…
C. forms of the same element that differ in the number of neutrons in each atom
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which shows the electron configuration for silicon (si)? ○ ar4s²3d¹⁰4p⁴…
D. $[\text{Ne}]3s^23p^2$ (assuming the last option is D, with the option text $[\text{Ne}]3s^23p^2$)
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the symbol for xenon (xe) would be a part of the noble gas notation for…
B. cesium.
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what is the electron configuration of chlorine (cl)? ○ $1s^2 2s^2 2p^6 …
B. \(1s^2 2s^2 2p^6 3s^2 3p^5\)
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9) write 0.375 as an equivalent fraction (in simplest form). 10) solve …
$\frac{3}{8}$ ### Question 10
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which characteristics of dickinsons style are evident in \the snow\? se…
- four - line stanzas - a varying rhythm - the use of personification
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mixed practice 7) write four numbers that fall between 9.18 and 9.19. 8…
\( 9.181 \), \( 9.182 \), \( 9.183 \), \( 9.184 \) (answers may vary, any four numbers between \( 9.18 \) and \( 9.19 \) are correct) ### Question 8
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name: teacher: date: chemistry: u1l5 mixture separation prepwork part 1…
To solve this mixture - separation matching problem, we analyze each mixture and the appropriate separation technique: ### 1. A muddy puddle A muddy puddle consists of solid mud p…
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read the excerpt from \sonnet 29.\ when, in disgrace with fortune and m…
abab (the option corresponding to "abab")
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q1 chemistry! utl6 mixture separation plan date: ______ prepwork prepwo…
A separation technique that could be used is chromatography (e.g., paper chromatography or thin - layer chromatography). Justification: Marker ink is a mixture of pigments. Chroma…
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read the rough-draft paragraph. (1) many people experience a sense of t…
3
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how many sigfigs are in the final answer for (2.5 + 8.6) x 10.0? explai…
The final answer has 3 significant figures.
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q1 chemistry: u1l7 unit 1 review date: prepwork: u1 review 1. **carbon …
- **Solid Phase (Left Section)**: Draw $CO_2$ symbols (from key) in a tight, ordered grid. Label "Solid $CO_2$ (Dry Ice)". - **Liquid Phase (Middle Section)**: Draw $CO_2$ symbols…
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5. **name two processes that can be used to separate two clear, miscibl…
Two processes to separate two clear, miscible liquids are **Simple Distillation** and **Fractional Distillation**. A scientist would choose Simple Distillation when the boiling po…
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why is it important to write quantities with the correct number of sign…
To indicate how precisely a quantity is known.
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name: __________________________ teacher: ____________ q1 chemistry: u1…
c. A mixture can be separated by physical means.
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directions: calculate the following expressions with significant figure…
### 1. For \( 1.50 + 1.7 \) # Explanation: ## Step1: Identify operation and rule Operation: Sum (addition). For addition/subtraction, we go by decimal places. \( 1.50 \) has 2 dec…
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significant figures exit slip name: jeremiah o per: directions: find th…
s: 1. For 17500 (assuming a typo and intended 1870.7): 5 (Rule: Zeros between non - zero digits and non - zero digits are significant) 2. 7.056: 4 (Rule: Zeros between non - zero …
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significant figures exit slip name: jeremiah d per: ______ directions: …
3 ### Problem 2: 7.056 (Number of Significant Figures)
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question: which piece of scientific evidence might disprove the capture…
The age and rock chemical composition of both bodies.
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use this key to fill in the missing information in the element squares …
To solve this, we use the periodic table's structure (period = row, group = column, family = similar properties). Let's take an example (e.g., Mercury, Hg): ### Step 1: Identify M…
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question 19 of 20 : select the best answer for the question. 19. what i…
B. Methane levels decreased and oxygen levels increased, promoting aerobic life forms.
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what radioactive element has the lowest atomic number? tc how many of t…
Technetium (Tc) (atomic number 43) or Hydrogen - 3 (tritium, atomic number 1, radioactive isotope). If considering elements (not isotopes) with no stable isotopes, Technetium (Tc)…
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question 8 of 20 : select the best answer for the question. 8. why is o…
D. It completely removes any available topsoil. (Note: There is an error in the above analysis. The correct answer is D. Open - pit mining, also known as strip mining, involves th…
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question 4 of 20 : select the best answer for the question. 4. how does…
B. By blocking fish migration
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what is the short form used to illustrate a rhyme scheme? (1 point) ○ a…
B. a series of capital letters
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the rda for the trace element selenium is 0.000070 g/day. express this …
\(0.070\space mg/day\)
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a typical multivitamin tablet can contain 2.0 mg of vitamin b₂ (ribofla…
\(2\)
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the recommended daily allowance (rda) of the trace metal magnesium is 4…
410000
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11. give an example of each of the following: a) a heterogeneous mixtur…
- a) Heterogeneous mixture: Salad (lettuce, tomatoes, cucumbers) - b) Homogeneous mixture: Salt - water solution - c) Element: Oxygen ($O_2$) - d) Compound: Water ($H_2O$) - e) Ph…
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10. classify the following as heterogeneous mixtures or homogeneous mix…
To solve this, we recall: A **homogeneous mixture** has a uniform composition throughout (solution, colloid if uniform), while a **heterogeneous mixture** has non - uniform compos…
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8. if the combination of iron filings and sulfur in question 7 is heate…
This is a pure substance (specifically a compound). Because iron and sulfur reacted chemically to form iron sulfide, which has a fixed chemical composition and distinct properties…
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a student is testing the boiling point of an unknown liquid. he calcula…
If we assume the error is a positive error (experimental value is higher than theoretical), the experimental boiling point is $\boldsymbol{81^\circ\text{C}}$. If we assume negativ…
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5. what is a compound? what are compounds composed of? what is true abo…
- A compound: A pure substance formed when two or more different elements chemically combine in a fixed proportion. - Composed of: Atoms of two or more different elements, held to…
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the molecules in a solid lump of sugar do not move. true or false
False
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classify each of the following as a physical change or property, or a c…
To solve this, we need to recall the definitions: - **Physical change**: No new substance formed (e.g., phase change, color change without reaction). - **Chemical change**: New su…
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classify each of the following as a physical change or property, or a c…
**: Chemical Property ### b)
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1. what are the two characteristic properties of matter? 2. ______ has …
Mass and Volume ### Question 2: ______ has a definite volume but takes the shape of its container
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kealey will participate in a classroom discussion in which students sha…
A. bringing notes about her findings C. reading and reviewing classroom materials D. supporting her findings with evidence
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within the periodic table, elements are organized consecutively by 1 po…
atomic number within rows
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define covalent bond 1 point options: - when two atoms share electrons …
The correct option is: When two atoms share electrons
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is it easier for elements like carbon and nitrogen to share electrons, …
Share
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define ionic bond 1 point options: - when two atoms share electrons equ…
The option "When two ions of opposite charge are attracted to each other and sit next to each other" (the first option in the second column of the given choices).
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do any of the elements have the same number of protons?
No (the option labeled "No")
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do any of the elements have the same atomic number? yes no 1 point
No. (with the corresponding radio button selected for "No")
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is the mass of the electrons taken into account when we measure atomic …
No
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what subatomic particle is found floating around the nucleus of an atom…
Electron (the option labeled "Electron")
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chemistry worksheet - scientific notation, significant figures, units &…
### Question 1: Write each number in proper scientific notation #### Part A: 450,000 # Explanation: ## Step 1: Move decimal to get \( 1 \leq a < 10 \) Move decimal 5 places left: …
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mastery view predictive assessments english ii questions 16-17 refer to…
B. by using allusion to a historic battle to examine ideas of bravery and sacrifice
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question: seawater contains salt, a/an ___ molecule that consists of a …
ionic
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still feels unmotivated when learning chemistry and geography and asks …
A. Focus@Will
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after agreeing with your suggestion to try out notion for tracking her …
B. Rewards that unlock music tutorials after learning sessions
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responsibilities. she’s a talented musician but struggles with balancin…
Notion
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which of the following would best describe x in the diagram above? a) b…
C. Volcanic eruptions are a major source of non - anthropogenic inputs.
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part iii- true or false ____7. in the density column to the right, oil …
False ### Question 8
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6. a rock has a mass of 60 grams. a graduated cylinder has an initial v…
Volume of rock: \( 20 \, \text{mL} \) (or \( 20 \, \text{cm}^3 \)), Density: \( 3 \, \text{g/cm}^3 \) ### Question 7
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2. four mixtures are made by combining two clear liquids, and observati…
B. Mixture 2: The liquids, when mixed, produced a solid which settled to the bottom.
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density & chemical changes 6th grade review this is what i should have …
D. Bubbles are given off and there is a temperature change. ### Question 2
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part i-matching 1. the image shows what happens when cold medicine tabl…
D. Bubbles are given off and there is a temperature change.
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question: whats the term used for water molecules bonding with elements…
B. Hydration
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complete the following table: | name | symbol | atomic number | mass nu…
To complete the table, we use the following relationships: - Atomic number (\(Z\)) = Number of protons = Number of electrons (in neutral atoms). - Mass number (\(A\)) = Atomic num…
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fill in the blank question caffeine is a and a natural component of the…
stimulant (or alkaloid, but stimulant is more context - appropriate for the effect - related description here)
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write the relationship below using function notation (that is, y is a f…
\( m = f(v) \)
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c. how many protons are there in any cl atom? ____ d. how many protons …
17 ### Sub - question d:
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c. how many protons are there in any cl atom? ____ d. how many protons …
17 ### Sub - question d: How many protons are there in any Te atom?
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which best describes the structure of the poem \safari day in kenya\? ○…
D. free verse with varied line lengths (assuming the options are labeled A - D as per typical multiple - choice, with the last option being D)
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questions: a. what is the atomic number of chlorine (cl)? ______ b. wha…
a. 17 b. 74