化学
化学反応、化学量論、分子構造、元素の性質。
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what is the empirical formula (lowest whole number ratio) of the compou…
1. $\text{CH}_4$ 2. $\text{KCl}$ 3. $\text{AlPO}_4$ 4. $\text{MgBr}_2$ 5. $\text{Na}_2\text{SO}_4$ 6. $\text{CuSO}_4 \cdot 5\text{H}_2\text{O}$
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solve the following problems. 6. how many grams of oxygen can be produc…
6. $\boldsymbol{39.2\ \text{grams}}$ 7. $\boldsymbol{17.5\ \text{grams}}$ 8. $\boldsymbol{109\ \text{grams}}$
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ions to $oh^-$ ions at a ph = 6.of $h^+$ ions to $oh^-$ ions listed ing…
1. Concentration of $H^+$ ions: $\boldsymbol{10^{-6}}$ mol/L 2. Concentration of $OH^-$ ions: $\boldsymbol{10^{-8}}$ mol/L 3. Ratio of $H^+$ to $OH^-$ ions: $\boldsymbol{100:1}$
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determine the percentage composition of each of the compounds below 1. …
1. $\text{KMnO}_4$: $\text{K} = 24.7\%$, $\text{Mn} = 34.8\%$, $\text{O} = 40.5\%$ 2. $\text{HCl}$: $\text{H} = 2.7\%$, $\text{Cl} = 97.3\%$ 3. $\text{Mg(NO}_3\text{)}_2$: $\text{…
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science cr lab: acids and bases virtual lab active step 3: create a mod…
What is the concentration of $\text{H}^+$ ions at a pH = 6? $10^{-6}\ \text{mol/L}$ What is the concentration of $\text{OH}^-$ ions at a pH = 6? $10^{-8}\ \text{mol/L}$ What is th…
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compare the student text with the source. source: richard van noorden, …
No, it is not plagiarized.
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compare the student text with the source. source: richard van noorden, …
No, it is not plagiarized.
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an element with mass 370 grams decays by 26.9% per minute. how much of …
3.4 grams
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1. what is the incorrect statement? a. an ideal gas is a hypothetical g…
1. c. The relationship between the four variables of a gas is established by the simple gas law 2. c. Normal atmospheric pressure can be represented by: 101.3 Pa = 760 mm Hg = 1 a…
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find the relative clause. if it is nonrestrictive, set it off with comm…
When adding organic materials to a compost pile, gardeners should avoid animal products and fats in favor of scraps from plants that have not been treated with pesticides.
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types of reactions worksheet balance the following equations and indica…
1. Balanced equation: $3\text{NaBr} + \text{H}_3\text{PO}_4 ightarrow \text{Na}_3\text{PO}_4 + 3\text{HBr}$; Type: Double Displacement 2. Balanced equation: $3\text{Ca(OH)}_2 + \t…
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find the relative clause. if it is nonrestrictive, set it off with comm…
During his tour of the organic chocolate factory, Jim learned about the Theobroma cacao, which is a cacao tree native to the rain forests of Central America.
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lab data preparation of second diluted solution molarity of first dilut…
$0.000246\ M$
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1. mole-to-mole (synthesis of water)the reaction between hydrogen gas (…
1. Balanced Equation: $2\text{H}_2 + \text{O}_2 ightarrow 2\text{H}_2\text{O}$ Moles of $\text{H}_2\text{O}$: $9.00$ mol 2. Balanced Equation: $\text{CH}_4 + 2\text{O}_2 ightarrow…
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classifying chemical reactions classify the following reactions as synt…
1. Decomposition 2. Double Replacement 3. Single Replacement 4. Synthesis 5. Single Replacement 6. Synthesis 7. Decomposition 8. Single Replacement 9. Double Replacement 10. Synth…
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1) how many milliliters of the approximately 0.012 $m$ copper(ii) sulfa…
2.00 mL
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preparation of first diluted solutionmolarity of stock cuso₄ solution (…
$0.0123\ M$
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how to calculate volume of concentrated solution needed to prepare a di…
10.00 mL
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lab data preparation of stock solution mass of $ce{cuso_{4}·5h_{2}o}$ (…
$0.123\ \text{M}$ (rounded to 3 significant figures)
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question consider the following newman projection: what word or two-wor…
What word or two-word phrase describes this conformation? Staggered conformation How many Br atoms are gauche to the H atom on the back carbon? 1 How many Br atoms are anti to the…
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which of these structures shows how the pictured molecule will look aft…
Third top option: ``` OH H \ / C(CH3)=N-C-C(CH3) \ / H OH \ CH3 ``` (Structural description: Left end is $C(CH_3)=NCH_3$, followed by chiral center with wedged $H$, dashed $OH$, t…
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1) how many grams of copper(ii) sulfate pentahydrate ($\text{cuso}_4 cd…
$2.99664\ \text{g}$ (or $\approx 3.0\ \text{g}$ when rounded to two significant figures)
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what states of water occur on earth?active reading 9 identify as you re…
1. When liquid water changes into an invisible gas it is called: water vapor 2. What is the chemical formula of water? $\text{H}_2\text{O}$ 3. What states of matter does water exi…
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use the reaction below to answer the question: $2na + cl_2 \ ightarrow …
351 grams
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balance the chemical equation: $square$na + $square$cl$_2$ $ ightarrow$…
$2\text{Na} + 1\text{Cl}_2 ightarrow 2\text{NaCl}$ (The coefficients are 2, 1, 2 respectively for Na, $\text{Cl}_2$, and NaCl)
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6. how many grams are in 1.11 moles of manganese sulfate, $\text{mn}_3(…
1. 929.41 grams 2. 0.11 moles (rounded to two significant figures)
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5 how many moles are in 3.3 grams of potassium sulfide, $\text{k}_2\tex…
$0.030$ moles (rounded to two significant figures)
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8. choose the answer. use the combined gas law to solve for the final c…
129 °C
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7. choose the the answer. use the combined gas law to solve for the fin…
1.02 L
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4. choose the the answer. use gay-lussacs law to solve for the final pr…
3.09 atm
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check the box for the law each statement or equation describes. combine…
| Statement/Equation | Combined Gas Law | Gay-Lussac's Law | Charles's Law | |---------------------|------------------|------------------|---------------| | As temperature increas…
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14) choose the best answer. hydrogen gas is produced when magnesium met…
30.4 mL (Note: Rounding differences in intermediate steps may lead to this closest option)
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6 pts match each energy transfer process with its correct definition: t…
1. Transfer of heat through molecular collisions in solids or between solids and fluids; heat moves from warmer to colder portions. → Conduction 2. Transfer of energy via electrom…
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(2) choose the best answer. a 54.0 ml sample of hydrogen gas is collect…
50.5 mL
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11) choose the best answer. a 500.00 ml sample of methane gas at 1.20 a…
5.59 atm
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what happens to air temperature when air rises and expands?○ it heats f…
1. It cools adiabatically 2. Convection
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1. name the orbitals described by the following quantum numbersa. $n=3,…
1. a. $3s$ b. $3p$ c. $3d$ d. $5s$ 2. a. $n=1, l=0$ b. $n=3, l=0$ c. $n=2, l=1$ d. $n=4, l=2$ 3. $1s < 3s < 3p < 4s < 3d < 5p < 6s < 4f < 5d < 7s$ 4. a. $m_l = 0$ b. $m_l = -1, 0,…
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non polar covalent bonding if the electronegativity values are nearly e…
1. In nonpolar covalent bonds, the electronegativity of the bonded atoms is nearly equal, so electrons are shared perfectly equally between the atoms. In polar covalent bonds, the…
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9) choose the best answer. use significant figures. use the combined ga…
271 °C
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5) choose the best answer. use significant figures. use the combined ga…
1.86 L
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elaborate-types of bonds directions: study the diagram below. write you…
1. Intermolecular 2. Intramolecular
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each water molecule acts like a bar magnet. what part of the water mole…
The oxygen side
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7. which element has its last electron in the $4d^7$ sublevel? explain …
Technetium (Tc). The noble gas core before the 4d sublevel is Kr (36 electrons). Adding 7 electrons in the 4d sublevel gives a total of 43 electrons, which matches the atomic numb…
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4) choose the best answer. what must be held constant when applying avo…
pressure and temperature
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3) choose the best answer. which value represents $k$ in avogadros law?…
22.4 L/mol
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2) choose the best answer. which formula represents avogadros law? $\fr…
$\boldsymbol{k = \frac{V}{n}}$
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1) choose the best answer. avogadro stated that equal volumes of gases …
○ numbers of particles
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match each atmospheric term with its correct definition: temperature gr…
- Temperature Gradient: A change in temperature with distance; determines how temperature changes with altitude in each atmospheric layer. - Atmospheric Pressure: The force of air…
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if an incident occurs that is out of your control while taking the quiz…
Question 1: Gravity pulls gas molecules toward Earth's center, creating higher density at lower altitudes Question 2: Chlorofluorocarbons (CFCs)
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subshells & their orbitals 1. describe the shape each subshell and sket…
1. | Description | S Orbital | P Orbitals | |-------------|-----------|------------| | | Spherical, symmetric around the atomic nucleus | Dumbbell-shaped; three mutually perpendic…
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find the # of moles in each case: 1. 2.5 l of $o_2$ 2. 67 l of $n_2$ 3.…
1. Moles of $\text{O}_2$: $\frac{2.5}{22.4} \approx 0.11\ \text{mol}$ 2. Moles of $\text{N}_2$: $\frac{67}{22.4} \approx 3.0\ \text{mol}$ 3. Moles of steam: $\frac{120}{22.4} \app…
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5. using gay-lussacs law, calculate the new temperature in the followin…
5. $\boldsymbol{-128^\circ\text{C}}$ 6. $\boldsymbol{443\ \text{kPa}}$
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highlight all the words that make up the appositive phrase. the chemist…
Professor Ramirez
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find the # of moles in each 1. 300 g of $\text{h}_2\text{so}_4$
Approximately $3.06$ moles (or exactly $\frac{300}{98.086}$ moles)
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what is the correct iupac name for the following organic compound? answ…
Tetradecane
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question 6 not yet answered marked out of 2.00 flag question what is th…
Decane
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complete the text with the analysis that most logically connects the cl…
The researchers attributed much of the success of their project to the efficiency and breadth of the citizen scientists' work.
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the reaction a +2b $ ightarrow$ products has the rate law, rate= $kab^3…
8
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nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction…
$\boldsymbol{1.8 \times 10^{-5}}$ (Option: 1.8 x 10⁻⁵)
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the reaction $2nobr(g)\ ightarrow 2no(g) + br_2(g)$ is a second order r…
0.0325 M
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the rate law for the reaction $3a\ ightarrow 2b$ is rate=$ka$ with a ra…
15.5 h
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the half life of a first order reaction is $7.80 \\times 10^{2}$ sec. c…
8.88 x 10⁻⁴ sec⁻¹
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considering the arrhenius equation, what is the slope of a plot of ln k…
D. $\frac{-E_a}{R}$
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which is a thesis statement? marie curies experiments with radioactivit…
Marie Curie's experiments with radioactivity, discovery of two elements, and work as a physics professor made her the greatest scientist of her time.
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a reaction was shown to follow second-order kinetics. how much time is …
2.36 s
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what is the order of the reaction if a decomposes to b and c with a rat…
B. first
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what are the units for the rate constant of a first-order reaction? ans…
A. $\text{s}^{-1}$
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7. which element has its last electron in the 4d⁷ sublevel? explain how…
7. Ruthenium (Ru). The electron configuration is [Kr] 4d⁷ 5s¹; it is a 5th-period d-block element, with its highest energy (last) electrons occupying the 4d sublevel (with an exce…
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which of the following is equivalent to the rate at which clo₃⁻(aq) is …
E. $+\frac{\Delta[\text{ClO}_3^-]}{\Delta t}$
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colorful spoonfuls lab - name ______ - per 3objective: i can describe t…
A. | Secondary Color | Yellow (Tablespoon) | Red (Teaspoon) | Blue (¼ Teaspoon) | Simplified Ratio (Yellow:Red:Blue) | |-----------------|---------------------|----------------|--…
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ionization energy14. what trend in ionization energy do you see as you …
14. It decreases 15. Atomic size increases, shielding increases, so the outermost electron is held less tightly, requiring less energy to remove. 17. Atomic size decreases, nuclea…
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a 58.0 g sample of unknown composition was carefully analyzed and found…
$\text{C}_6\text{H}_9\text{O}\text{N}_5$
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a chemical compound composed of nitrogen and oxygen was carefully analy…
$\text{N}_2\text{O}_3$
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need a closer look? view this ph scale on desmos.table 1 shows the amou…
3. D. The pH of a solution is lower after the titration because of the addition of an acid. 4. C. The pH changes in the opposite direction and the colors would be reversed.
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3. hypochlorous acid and hypochlorite when considered together are also…
3. c. free chlorine 4. b. Chlorine dioxide
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5. acetic acid has a melting point of 16.6°c and a boiling point of 117…
A labeled heating curve for acetic acid is structured as follows (description, which can be translated to a graph): - **X-axis**: Heat Added (increasing left to right) - **Y-axis*…
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9. if a material has a high electron affinity, what will occur when it …
The object with higher electron affinity will gain an electron and end up negatively charged, while the object with a lower electron affinity will loose an electron and end up pos…
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4. describe the movement of the particles at the boiling point of a sub…
When a substance is at its boiling point: 1. **Temperature**: The temperature of the substance remains constant, even as more thermal energy is added. 2. **Energy**: The added the…
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sealing of cuts in skin by blood clotting:when the skin is cut, blood v…
The blood clotting cascade proceeds as follows: 1. Vessel/skin damage activates platelets and releases tissue factor (TF), which binds to factor VII to form TF:VIIa. 2. TF:VIIa ac…
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date 2/11/26 student #____you must create a bohr model for each atom, i…
| | protons | neutrons | electrons | |---|---|---|---| | 6. $^{22}_{11}\text{Na}$ | 11 | 11 | 11 | | 7. Fluoride ion, $\text{F}^-$ | 9 | 10 | 10 | | 8. Magnesium ion, $\text{Mg}^{…
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chemical reactions task cards created by teamwork toolbox (2017)chemica…
$\text{B}_2\text{Br}_6 + 6\text{HNO}_3 ightarrow 2\text{B(NO}_3\text{)}_3 + 6\text{HBr}$ ---
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which of these statements about airplane and rocket flight is true? a. …
B. Only one requires air molecules to generate lift.
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a rocket uses an engine that creates thrust through the combustion of a…
A. Chemical rocket
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3/15 what is the result of the reaction between potassium bromide and a…
B. no precipitate is formed
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2/15 which of the following compounds is soluble? strontium carbonate p…
potassium carbonate
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which term below describes the study of how energy is transferred to di…
A. Thermodynamics
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which change does nitrogen undergo oxidation? a. $ce{no_{2} -> n_{2}o_{…
D. $\text{NH}_3 ightarrow \text{N}_2$
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multiple-choice question how do you determine the number of neutrons? p…
Mass # - Atomic number
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1. which type of reaction? $ce{mg + 2hcl -> h_{2} + mgcl_{2}}$synthesis…
1. Single Replacement 2. A: Reactants; B: Yield Sign; C: Product 3. Ca: 3 atoms, C: 12 atoms, H: 18 atoms, O: 12 atoms 4. $4\text{P} + 5\text{O}_2 ightarrow 2\text{P}_2\text{O}_5$…
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multiple-choice question what happens if you heat up a liquid? it becom…
A. It becomes a gas.
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6 protons if carbon is neutral, then how many electrons should it have?…
6
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energy level # of electrons 1 2 2 8 3 18 what is the maximum number of …
8
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multiple-choice question which element is in the second period of the p…
D. Carbon
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which of these elements is not present in $\text{nano}_3$? nitrogen sod…
hydrogen
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1/10 how many total elements are in the chemical formula $ce{fe_{2}(no)…
3
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find the element: protons: 8 neutrons: 9 electrons: 8
Oxygen (O)
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what needs to be added for a solid to turn into a liquid and then gas? …
energy
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6/10 how many total atoms are in the chemical formula $\text{c}_3(\text…
9
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how many atoms of hydrogen are in this compound? 2 4 3 1
A. 2
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1/10 how many atoms are there total in $ce{h_{2}so_{4}}$? 5 3 7 6
7 (corresponding to the orange option with the number 7)