Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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15 select the correct answer. what is the chemical formula of calcium c…
D. \(CaCl_2\)
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select the correct answer. how many electrons does a covalent bond cons…
B. two
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read the poem. there are 20 lines in the poem. the poem is numbered eve…
3. The speaker gains a feeling of happiness when summer makes the earth beautiful. ### Part B
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select the correct answer. which two particles can form an ionic bond w…
C. a positive calcium ion and a negative oxygen ion
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which statement describes what happens to elements during radioactive d…
The correct option is: They release energy.
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which phrase describes carbon-14 dating? ○ uses the rate at which nitro…
dates the remains of organisms to determine when they died
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type the correct answer in each box. chromium(iii) sulfate is a transit…
The oxidation state of chromium is $\boldsymbol{+3}$, and the chemical formula is $\boldsymbol{\ce{Cr_2(SO_4)_3}}$ (filling the boxes as: first box: 3; then the formula boxes: Cr,…
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select the correct answer. which structure represents nonane? a. h | h-…
D. \( \begin{array}{c} \ce{H} & \ce{H} & \ce{H} & \ce{H} & \ce{H} & \ce{H} & \ce{H} & \ce{H} & \ce{H}\\ \vert & \vert & \vert & \vert & \vert & \vert & \vert & \vert & \vert\\ \ce…
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which element is more reactive than rubidium (rb)? a. aluminum (al) b. …
B. cesium (Cs)
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carbon, helium, hydrogen, iodine, oxygen, sodium; diatomic element, mon…
Diatomic Element: hydrogen, iodine, oxygen Monatomic Element: carbon, helium, sodium
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select the correct answer what is the chemical name of the covalent com…
C. sulfur hexafluoride
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select the correct answer: what is the chemical formula for the compoun…
C. $\ce{(NH4)3PO4}$
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final answer for this problem should have how many significant figures?…
B. 3
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place each noble gas symbol in front of the appropriate partial electro…
To solve this, we match each partial electron configuration with the appropriate noble gas (its core electron configuration) by considering the electron configuration rules and no…
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what type of shapes did gauguin use most often? ○ vertical ○ organic ○ …
B. organic
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what should the final answer be rounded to according to significant fig…
40.
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select the correct answer. which structure correctly represents the bon…
B. $\ce{H - \overset{H}{\underset{H}{C}} - \overset{H}{\underset{H}{C}} - \overset{H}{\underset{H}{C}} - \overset{H}{\underset{H}{C}} - \overset{H}{\underset{H}{C}} \equiv \overse…
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select the correct answer. which structure is the lewis structure for a…
C. \( \begin{matrix} & & \text{H} & & \\ & & | & & \\ \text{H} & - & \text{N} & - & \text{H} \\ & & \text{..} & & \end{matrix} \)
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this problem (12 x 3) should have how many significant figures in its f…
2 (the option with "2" as the number of significant figures)
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select the correct answer. bromine (br) belongs to the halogen family. …
D. 7
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for the problem that she is working on currently, how many significant …
B. 3
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select all the correct images. select the atomic models that belong to …
- Top - left atomic model (with 2 P, 3 N, 2 E) - Top - right atomic model (with 2 P, 2 N, 2 E) - Bottom - left atomic model (with 2 P, 1 N, 2 E)
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5. ne 10 10. fe 26 create box diagrams for each of the following elemen…
### 1. Ne (Neon) #### Explanation: - **Step 1: Determine electron configuration** Neon has an atomic number of 10, so its electron configuration is \(1s^2 2s^2 2p^6\). - **Step 2:…
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select the correct answer. a chemist divides a large sample of a mixtur…
C. heterogeneous mixture
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you should do what before you count the significant figures from the nu…
B. math first
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select the correct answer. which statement describes both homogeneous m…
C. Their components can be separated by physical processes.
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select the correct answer. which statement best describes how a compoun…
A. A compound contains two or more elements in a fixed proportion.
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fluorine sodium phosphorus magnesium
First box: sodium Second box: magnesium Third box: fluorine Fourth box: phosphorus
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14. a student mixes strawberry kool - aid and water. a ph meter is used…
The strawberry Kool - Aid solution is acidic. ### Question 15
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select the correct answer. which quantity is a graduated cylinder desig…
E. volume
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question 13 (4 points) (01.06 mc) the gas carbon dioxide is a pure subs…
b. Carbon and oxygen are chemically bonded in it. ### Question 14
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40 report sheet • separation of the components of a mixture 7. how does…
The percentage of calcium carbonate in the mixture is approximately \(51.12\%\) (or more precisely, \(\frac{1.82}{1.05 + 0.69 + 1.82} \times 100\% \approx 51.1\%\) depending on ro…
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type the correct answer in the box. round your answer to the nearest hu…
63.55
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question 10 (4 points) (01.05 lc) which of the following could result f…
b. It undergoes phase change. ### Question 11
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question 8 (4 points) (01.04 mc) the table compares the characteristics…
a. It is a solid because strong attractive forces prevent particles from moving. ### Question 9
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question 6 (4 points) (01.02 mc) jeff used an equal arm balance to weig…
c. 4.3 g ### Question 7
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a substance that speeds up a chemical reaction without being changed it…
B. catalyst
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drag each tile to the correct location. several properties of water are…
- **Physical**: is liquid at room temperature, has a density of \(1.0\ \text{g/cm}^3\) - **Chemical**: can be split into hydrogen and oxygen, reacts with certain metals
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14. a student mixes strawberry koolaid and water. a ph meter is used to…
Strawberry Kool - aid is an acidic solution. ### Question 15
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hematite is a naturally occurring mineral and a common form of iron ore…
B. The hematite particles rearrange to form a new substance.
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experimental data record your results in table 6.1 or in a copy of the …
- **Measured**: "Mass of each isotope (mg)" (Step 1), "Number of each isotope" (Step 2). - **Calculated**: "Average mass of each (mg)" (Step 3), "Percent of each (%)" (Step 4), "R…
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question 1 (4 points) (01.01 lc) which of these statements best explain…
a. It can measure data by experiments. ### Question 2
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drag each tile to the correct box elements of each group in the periodi…
- solids at room temperature → alkali metals - don't react naturally with other elements → noble gases - very reactive nonmetals → halogens
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drag each tile to the correct location. classify each property as inten…
- Intensive Property: reactivity with acid - Extensive Property: volume, length
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select the correct answer. several properties of the element magnesium …
E. burns when exposed to heat
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foldables make a three - tab foldable to record information about each …
As particle speed increases, the distance between particles generally increases. Lower - speed particles (e.g., in solids) are closer together, while higher - speed particles (e.g…
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select the correct location. which part of the periodic table would con…
The yellow - colored block (the one below the main body of the periodic table, representing the f - block which contains lanthanides and actinides with partially filled \( f \)-su…
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select the correct location identify an element on the periodic table t…
The element chemically similar to boron (B) is Aluminum (Al) (located in the same group as B, group 13, with atomic number 13, in the table it's in the row starting with K, Ca, et…
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separation of the components of a mixture | 3 pre-lab questions before …
(a) Mixture, Heterogeneous; (b) Mixture, Heterogeneous; (c) Mixture, Heterogeneous; (d) Mixture, Homogeneous; (e) Pure Substance ### Question 2
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select the correct location. an atom has a partially filled p sublevel.…
The light blue (right - most) section of the periodic table.
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atoms, elements and isotopes note sheet elements - ______ that cannot b…
### Elements Section - First blank: **Pure substances** (Elements are pure substances that can't be broken down chemically into simpler substances). - "Consists of ______ letters"…
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question 16 (mandatory) (2.857 points) saved cultural competence starts…
C. Awareness (the option with the filled dot, representing the correct choice for "Cultural Competence starts with"). ### Question 17
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3. what kind of bond holds the hydrogen to the oxygen in one water mole…
Covalent bond ### Question 4
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properties of water and ph 1. write the chemical equation for water, an…
- Chemical Equation for water formation: $2H_2(g)+O_2(g) ightarrow 2H_2O(l)$ (or self - ionization: $H_2O(l) ightleftharpoons H^+(aq)+OH^-(aq)$) - Stick Model: A central $O$ atom …
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multiple choice: circle the best answer. 1. how many significant figure…
b) 3 ### Question 2
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name: jadarrian crump 5th block properties of water and ph 1. write the…
Covalent bond (specifically polar covalent bond) ### Question 4
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15. fireworks are primarily made of charcoal (solid carbon) that causes…
B. Inorganic chemistry (assuming the options are labeled as A: analytic chemistry, B: inorganic chemistry, C: organic chemistry, D: biochemistry)
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13. which of the following correctly measures the volume (in ml) depict…
18.30 mL
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name: jadarian crump 5th properties of water and ph 1. write the chemic…
The bond that holds hydrogen to oxygen in one water molecule is a polar covalent bond. ### Question 4
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8. which branch of chemistry is concerned with the properties and chang…
C. physical chemistry
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name: jadarrian crump 5\ week properties of water and ph 1. write the c…
The bond holding Hydrogen to Oxygen in one water molecule is a **polar covalent bond** (or simply "covalent bond" for a more basic answer). ### Question 4
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create dot diagrams for each of the following elements/ions. only use y…
Bohr diagram for Ne: Nucleus (Ne) with 2 electrons in first shell, 8 in second shell. ### 2. $\boldsymbol{\ce{Na^{+1}}}$ (Sodium ion)
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launch: look at the figure below, then answer the questions: 1. if a ne…
The charge would be $+1$ (or positive one) because donating an electron (negative charge) makes the atom have more protons than electrons, resulting in a positive charge. ### Ques…
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electron configuration worksheet how many electrons does each of the fo…
To determine the number of electrons in each element/ion, we use the following rules: - For a neutral atom, the number of electrons equals the atomic number (number of protons). -…
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what does the forward arrow in a chemical equation mean? (1 point) the …
The reaction yields something.
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what happens during rusting of an iron nail? (1 point) ○ sulfur, iron, …
Iron and oxygen combine to form iron oxide.
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chemical reactions quick check how do catalysts affect a chemical react…
C. lower activation energy
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which best describes the rhyme schemes in \a psalm of life\ and \auspex…
The poems follow different rhyme schemes.
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a student wanted to test the hypothesis that adding antifreeze to water…
The correct option is the teal - colored one with the text "exactly the same set - up as the first experiment".
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six contestants on a reality tv show were stunned to find their lowest …
Mrs. Gamma Library Electrocution
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simplify the expression using the order of operations. (9 - (3 div 3)^2…
8
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which of the following lines from of plymouth plantation best show the …
The line "Being, after some time of entertainment and gifts, dismissed, a while after he came again, and 5 more with him, and they brought again all the tools that were stolen awa…
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simplify the expression using the order of operations. $9 - (3 \\div 3)…
s: For \( 9 - (3 \div 3)^2 \): \(\boldsymbol{8}\) For \( 4 - 5 + 6 \div 2 \cdot 7 \): \(\boldsymbol{20}\)
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ringing reefs seamounts ☑️ oceanic plateaus actively building volcanoes…
Abiotic lava flows flattened the topography as low spots were filled in.
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part b: short answer (1 mark each – total: 4 marks) 6. write the number…
\(7.02\times10^{3}\) ### Question 7
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build word knowledge rate your word knowledge. then discuss word meanin…
To solve this vocabulary - building task, we need to fill in the blanks for each word's meaning and examples based on our knowledge of the words. ### Word: adolescent - **Meaning*…
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these formerly were islands that have been eroded down to the depth of …
A. An oceanic plateau
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for each of the following draw structural formula of parent acid and pa…
To determine the parent acid and parent alcohol of the given ester, we analyze the ester structure: ### Step 1: Identify the ester functional group The given compound is an ester,…
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chemicals are dangerous to the environment. always dispose of them sele…
by following the directions on the label
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in \the author to her book\, the main reason bradstreet uses inversion …
A. complete the rhyme scheme.
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practice a using colons in sentences read each sentence. then, insert a…
### 1. # Explanation: ## Step1: Identify time separation In time notation, a colon separates hours and minutes. So between 11 and 40, and 12 and 25. <Chemistry class begins at 11:…
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select the correct compound. reactants undergo chemical reaction to for…
The incorrect part is \(10O_2\) (the coefficient of \(O_2\) in reactants).
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select the correct answer. the periodic table houses noble gas elements…
C. Their outermost shell has the maximum number of electrons that it can hold.
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discussion topic the subject of earth and space science is a vast topic…
For the topic *Climate Change Modeling*: - **Daily Activities (Differences):** Climate scientists analyze satellite/climate data, build climate models, and study historical climat…
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select the correct answer. which of these elements is rarely found in o…
C. barium
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read the excerpt from \the author to her book\. \thou ill-formd offspri…
D. A, A, C, C
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which statement best describes the rhyme schemes of \the author to her …
A. Both poets primarily use couplets to link ideas; Bradstreet uses inversion to complete rhymes.
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climate change quick check which human agricultural practice leads to t…
the use of synthetic fertilizers
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3. look at the model below. fill in the table below based on the atom i…
| Element | Protons | Neutrons | Electrons | Mass Number | Charge | |---------|---------|----------|-----------|-------------|--------| | Li | 3 | 4 | 2 | 7 | +1 |
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2. fill in the table with the correct information about the particles t…
| Particle Type | Location | Mass | Charge | |---------------|----------------|-------------------------------|-------------------------------| | Proton | Nucleus | ~$1\ \text{amu…
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the periodic table is shown below when a highly reactive metal, such as…
D. fluorine (F)
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lab equipment functions worksheet explain which piece of laboratory equ…
**: Beaker ### 2)
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learning target i can describe the charge, location, and masses of suba…
- The blue (-) particles: Electron - The dashed circular paths: Energy Levels - The central cluster: Nucleus - The gray particle in nucleus: Neutron - The orange (+) particle in n…
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the elements found in family 1 of the periodic table are so soft that t…
C. They produce enormous heat when mixed with water
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11. a new element x is discovered with two common isotopes. you find th…
153.6
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atoms that have the same number of valence electrons in their outer she…
D. belong to the same family of elements.
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(1 point) element name number of protons number of neutrons number of e…
For an atom to be neutral (overall charge of zero), the number of protons (positively charged particles) must equal the number of electrons (negatively charged particles). This is…
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16. a student determines the density of an irregularly shaped block of …
11.3 g/mL (corresponding to the option "11.3 g/mL")
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how would the particle diagram below be classified as? compound homogen…
heterogeneous mixture (assuming the diagram shows different particles not uniformly mixed; if options had labels like D. heterogeneous mixture, it would be D. heterogeneous mixtur…
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7. use the simulation in \symbol\ mode to build stable charged atoms of…
s for blanks: - Lithium: Number of Protons = 3, Number of Neutrons = 2, Charge = -1 - Third row: Element Name = Carbon, Number of Electrons = 6, Mass Number = 14