Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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4 multiple choice 1 point water is classified as ___ an element a mixtu…
C. a compound
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if a substance has freely moving molecules and does not have a fixed vo…
C. gas
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photo by jay galvin in the photo above, a large glacier is creating a v…
C. erosion by ice
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if a substance has a fixed volume and fixed shape, and the molecules ar…
solid
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if a substance has a fixed volume (meaning takes up a specific amount o…
B. liquid
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what is the state of matter below the melting point? liquid solid gas p…
B. solid
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multiple choice 1 point what is the temperature at which a liquid becom…
A. boiling point
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the temperature at which a solid becomes a liquid is called? boiling po…
C. melting point
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sublimation and deposition skip over what state of matter? solid liquid…
B. liquid
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photo by mahlum in the photo above, lichen and fungi are slowly causing…
A. chemical weathering
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2 multiple choice 1 point what is the energy of movement called? heat e…
C. Kinetic energy
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1 multiple choice 1 point is a change of state classified as a physical…
physical
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which observations from the investigations provide evidence that a chem…
No answer can be given without details of investigations.
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which of these would be considered evidence that a chemical change has …
A. A gas is produced C. A temperature change occurs
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amanda wants to make a cake. she measures sugar, eggs, oil, flour, and …
C. Baking the mixed ingredients because the ingredients change into a different substance.
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which of the following best explains what happens when a popsicle melts…
B. It is a physical change because it can be easily reversed.
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identifying atoms worksheet: from elements to subatomic particles direc…
6. Protons: 6, Neutrons: 6, Electrons: 6, Atomic Mass: 12, Atomic Number: 6, Element Symbol: C, Element Name: Carbon, Ion: no, Charge: 0 7. Protons: 7, Neutrons: 7, Electrons: 7, …
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question 1 ___ is formed when ultraviolet radiation decomposes chlorina…
1. B. Phosgene 2. (Option C seems cut - off, assuming it's Nomex, if so) C. Nomex
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the chemical formulas of three substances are shown below. - c₂h₆o - c₄…
elements; elements; chemical formulas
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based on the electron dot diagram, what ion charge would it create? * +…
-2 (corresponding to the option with the value - 2)
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which of the following can not be an ion? * aluminum hydrogen carbon br…
Krypton
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when beryllium becomes an ion it will ___(a)___ electrons as it ___(b)_…
a. lose b. empties c. cation
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electrons that are in the last/outer energy level of an atom are called…
Valence electrons
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match the scientist with their discovery. * dalton thompson rutherford …
Tiny indestructible spheres: Dalton Atoms have energy levels that contain different number of electrons: Bohr Protons, Neutrons & Electrons all exist: Chadwick Tiny dense nucleus …
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which of the following is a neutral atom with 9 electrons? * fluorine s…
A. Fluorine
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what element is shown in the photo below? * 11 p 12 n vanadium aluminum…
Sodium
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which of the following would result in a neutral atom? * 2 electrons + …
12 electrons + 12 protons
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an atom has 26 protons, 30 neutrons, and 26 electrons. what is its mass…
For the first question: B. 56 For the matching part: Positive charge: Protons Negative charge: Electrons Has no charge: Neutrons For the chart - filling part: Neutrons: Has mass E…
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ii. match the vocabulary word to the correct definition 1. cohesion a. …
1. e 2. g 3. a 4. f 5. d 6. b 7. c
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1. write the property of water that matches the picture. water force of…
Polarity, Surface Tension, Polarity, Capillary Action
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4. zinc phosphide, zn₃p₂, is often used as a rat poison. phosphorus has…
4. 2 5. C. $Rb_3N$
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3. a user is constructing an ionic bond between beryllium and chlorine …
Transfer an electron from the beryllium atom to the chlorine atom.
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2. which of the following is the best description of how electrons are …
A. A metal atom loses electrons and a nonmetal atom gains electrons.
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introduction: the periodic table arranges elements by size and property…
1. B. Sodium (Na) C. 1 2. Beryllium: 2, Magnesium: 2, Nitrogen: 5, Phosphorus: 5, Oxygen: 6, Sulfur: 6, Fluorine: 7, Chlorine: 7
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for each compound, click the camera ( ) icon to take a snapshot. right …
Ionic charges: Be $2+$, N $3 -$ Chemical formula: $Be_3N_2$
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for each compound, click the camera ( ) icon to take a snapshot. right …
Ionic charges: Be $2+$, N $3 -$; Chemical formula: $Be_3N_2$
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e. beryllium and nitrogen be n extension: chemical families get the giz…
1
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3. practice: use the gizmo to create stable compounds from the combinat…
A. Ionic charges: $Li^+$, $F^-$; Chemical formula: LiF B. Ionic charges: $Be^{2+}$, $O^{2 - }$; Chemical formula: BeO C. Ionic charges: $Mg^{2+}$, $F^-$; Chemical formula: $MgF_2$…
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geography of the mideast water is a major natural resource that is dist…
Water is a major natural resource distributed unevenly across Southwest Asia. Turkey and Iraq share the Tigris and Euphrates River system. Israel, Syria, and Jordan share the Jord…
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question: how are ionic compounds formed? 1. observe: look at the purpl…
1. A. 1 B. 2 C. No, because oxygen needs 2 electrons and one lithium can only give 1. 2. A. Yes B. $Li_2O$ C. $Li^+$, $Li^+$, $O^{2 - }$
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geography of the mideast water is a major natural resource that is dist…
Water is a major natural resource distributed unevenly across Southwest Asia. Turkey and Iraq share the Tigris and Euphrates rivers, Israel, Syria, and Jordan share the Jordan Riv…
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completion complete the table below using your periodic table. (1 point…
| Element | Atomic # | Atomic Mass | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | O | 8 | 16 | 8 | 8 | 8 | | S | 16 | 32 | 16 | 16…
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matter and measurement quiz cp chemistry a o / module 1: chemistry basi…
nm
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matter and measurement quiz cp chemistry a o / module 1: chemistry basi…
The liquid is odorless., The solution is green.
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a. observe the sodium and chlorine atoms. how many electrons are there …
A. Sodium: 11, Chlorine: 17 B. Sodium: 11, Chlorine: 17 2. Sodium: 1, Chlorine: 7 3. A. Sodium: +1, Chlorine: -1
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multiple choice question which of the following represents an experimen…
The temperature of a container of baking soda is measured three times after 30 ml of vinegar is added.
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12 question (2 points) open ebook section 1.9 1st attempt see hint larg…
7.7
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17. how do the isotopes hydrogen - 1 and hydrogen - 2 differ? a. hydrog…
17. b. Hydrogen - 2 has one neutron, hydrogen - 1 has none 18. a. mass numbers 19. d. \(_{24}^{55}Cr\) 20. d. Rutherford 21. a. 16, 16, 18 22. b. 50 protons, 50 electrons, 75 neut…
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2. click pause ( ‖ ). elements can be classified as metals and nonmetal…
A. The atom from which it is easier to pull an electron is a metal. The atom from which it is harder to pull an electron is a nonmetal. B. The metal forms a cation and the nonmeta…
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to begin, check that sodium (na) and chlorine (cl) are selected from th…
Sodium: 1 Chlorine: 7
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calculations - put a box around the final answers to your calculations …
$m_1 - m_0$ 16)
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label the following ph scale with the correct numbers at the far ends a…
1. The far ends of the pH scale: The left - hand end is 0 (most acidic) and the right - hand end is 14 (most alkaline). Hair's pH (around 4.5 - 5.5) would be on the acidic side of…
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8. the atomic number of an element whose atoms have 15 protons and 16 n…
8. b. 15 9. b. number of protons 10. b. \(^{1}_{0}n\) 11. a. Atoms of the same element are always identical 12. d. protons and neutrons 13. c. compounds 14. b. neutron 15. c. isot…
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identify the choice that best completes the statement or answers the qu…
1. c. 28 2. a. 16 electrons 3. d. Mass and relative abundance of each isotope of that element 4. b. the mass number 5. c. $^{204}_{82}Pb$ 6. b. were composed of negatively charged…
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prelab questions -14 (1 pt). determine the concentration (in molarity) …
The molarity of sodium phosphate monobasic (assuming volume of 1 L) is approximately $0.0051\ M$. The volume of stock rennin solution for 5% concentration to make 25 ml is $1.25\ …
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read the paragraph. 1 alejandros guidance counselor is helping him plan…
C. sentence 3
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the chemistry and energy of life - part 2 5. in your own words, name th…
5. First Law: Energy conservation. Second Law: Entropy increase. 6. Activation energy: Reaction energy - barrier. Catalyst lowers it. 7. Catabolic: Complex - to - simple, exergoni…
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carbon what is the study of carbon - containing compounds called? what …
The study of carbon - containing compounds is called organic chemistry. Common elements that bond with carbon to make up macromolecules are hydrogen, oxygen, nitrogen, phosphorus,…
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dangers of nuclear power plants . nuclear accidents or \meltdowns\ coul…
C. toxic waste
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adhesive forces between water molecules and glass molecules help water …
When adhesive forces are greater than gravity, water rises in a capillary tube.
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read the sentence. 1 alejandros guidance counselor is helping him plan …
sentence 3
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read the paragraph. 1 ji - yoo is brainstorming topics for a term paper…
sentences 3 and 6
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geography of the mideast water is a major natural resource that is dist…
Water is a major natural resource that is distributed unevenly across Southwest Asia. Some countries like Turkey and Iraq, have major rivers which provide an ample (more than enou…
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determine whether each statement is true or false. a scoop - shaped con…
1. True 2. False 3. True 4. False 5. True
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question 10 10 pts true or false? in the reaction mg(s) + niso₄(aq) → m…
True
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expecting to see cages and animals at the zoo before arriving is an exa…
T
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in the reaction mg(s)+sn²⁺(aq) → sn(s) + mg²⁺(aq) as written: mg gets r…
Mg gets oxidized, $Sn^{2+}$ gets reduced
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protocol 1. your ta weighed out 1 g of lipase 2. your ta dissolved lipa…
The volume in mL is 50 mL and the mass - volume percent of the lipase solution is 2%.
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match each molecule with its atomic model. ethane (c₂h₆) methane (ch₄) …
Ethane ($C_2H_6$) - top atomic model; Methane ($CH_4$) - middle atomic model; Water ($H_2O$) - bottom atomic model
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the case of the missing bicycle chief investigator: manna case details …
A girl with pants on holiday, with empty hands, having an indoor hobby, happy, standing, likes ping - pong and drives.
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author to her book anne bradstreet thou ill - formd offspring of my fee…
C. A, A, B, B
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which statement best describes the rhyme schemes of the author to her b…
Both poets use couplets for rhyme scheme and structure, inverting sentences when needed to maintain the rhyme.
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take the quiz below to see how well you know the vocabulary from this m…
A. waxes
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express your answer to four significant figures and include the appropr…
10.81 amu
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take the quiz below to see how well you know the vocabulary from this m…
A. mono - unsaturated fat
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which statements accurately describe atoms? check all that apply. atoms…
Atoms were named in the fifth century BCE.
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complete the statement. matter is made up of small particles called
atoms
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take the quiz below to see how well you know the vocabulary from this m…
A. liquid
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1. which resource would be most useful for identifying whether a sample…
C. Mineral Identification Chart
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sort these real - world examples by separation technique. items (5 item…
Filtration: Removing dust particles from the air, Separating coffee grinds from water Distillation: Preparing gasoline from crude oil, Preparing drinking water from seawater Chrom…
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part 2: adding acetic acid first, lets try adding some acetic acid to t…
pH decreased, meaning the solution is more acidic
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complete this assessment to review what youve learned. it will not coun…
2.5 degrees
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02 question (3 points) use the particulate representations of matter a …
Elements: C, D, I Compounds: B, F, G, H Mixtures: A, E
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complete this assessment to review what youve learned. it will not coun…
Crystals have an ordered, three - dimensional arrangement, while polymers are long chains
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which of the following representations depict homogeneous mixtures? (th…
A. Saline, D. Brass
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which type of molecule contains two atoms bonded together? (1 point) si…
simple molecule
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introduction to chemistry online practice complete this assessment to r…
C. filtration and evaporation
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which objective would be best achieved through evaporation? (1 point) s…
separating salt from seawater
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introduction to chemistry online practice complete this assessment to r…
filtration
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introduction to chemistry online practice complete this assessment to r…
B. lemonade with ice
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introduction to chemistry online practice complete this assessment to r…
density
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introduction to chemistry online practice. complete this assessment to …
Filing the nail is a physical change because the composition of the material does not change but the general appearance of the iron does change.
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introduction to chemistry online practice complete this assessment to r…
composition of the matter
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he author to her book\ and \a hymn to the evening\ thy visage was so ir…
The author found the appearance of her book very annoying.
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2. describe the property of water that is indicated by the data. how is…
Water has properties such as high surface - tension, high heat capacity, and cohesion. These are explained by its polar molecular structure and hydrogen bonding between molecules.
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part d what is the atomic symbol of an isotope of bismuth with 125 neut…
\(^{208}_{77}\text{Ir}\)
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1. given the distribution of charges shown in this water molecule, why …
The oxygen atom is more electronegative than hydrogen, leading to unequal charge distribution with a partial negative charge on oxygen and partial positive charges on hydrogen, cr…
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waters unique properties are due to its being a polar molecule. water h…
Place the negative symbol (-) near the oxygen atom (the large red sphere), and the positive symbol (+) near each of the hydrogen atoms (the small blue spheres).
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what is the atomic symbol of an isotope of bismuth with 125 neutrons? e…
iridium-208
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what does the first line of the poem mean? the author is addressing peo…
There is not enough information provided to determine a correct answer from the given options.