Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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central ideas and details: foundations scent is tightly interwoven with…
B. They believe the scents could illuminate important aspects of ancient life.
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in order to speed up a chemical reaction, you should ______________ the…
Lower
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unit 1, classwork #3 - mole conversions use dimensional analysis to sol…
$1.2044 \times 10^{24}$ atoms
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a word written over the arrow in a chemical reaction equation indicates…
None of the above options are correct.
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1. calculate the number of atoms in one mole of iodine.
1.2044×10²⁴
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a. a solution of two solids b. a mixture of particles with different de…
25. b 26. a
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which set lists the atomic models and scientists from the oldest (first…
X, Z, W, Y
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22. which of the following is not a pure substance? a. helium b. carbon…
22. c. Seawater 23. c. 41
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22. which of the following is not a pure substance? a. helium b. carbon…
c. Seawater ### 23.
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22. which of the following is not a pure substance? a. helium b. carbon…
c. Seawater ### 23.
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17. which of the following is a heterogeneous mixture? a. air b. soil c…
17. b. soil 18. c. 225g 19. a. Its mass and volume decrease. 20. d. oil and vinegar 21. b. salt water
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17. which of the following is a heterogeneous mixture? a. air b. soil c…
17. b. soil ## Step1: Apply law of conservation of mass The total mass of water in the cup before melting (125 g liquid water + 100 g ice) is 225 g. During the phase change from i…
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10. in a chemistry lab, students were given an unlabeled substance and …
Substance B is most likely a compound because it can be separated into simpler substances.
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exam 1: atomic theory/structure possible points: 36 e7 fill out the fol…
| Isotope Name | Nuclear Symbol | Atomic Number | Mass Number | # of protons | # of neutrons | # of electrons | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | calcium - 40 |…
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7. which term means “a combination of two or more substances that keep …
7. b. mixture 8. c. liquid 9. d. volume 10. c. gas only 11. d. liquid only
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exam 1: atomic theory/structure possible points: 3.33 an isotope of oxy…
D. 18
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for a substance to change from a gas to a liquid, what must happen to i…
B. They must lose enough of their kinetic energy that their motion is influenced by the attractions between them.
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6. which of the following is considered a physical property of a substa…
b. malleability
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exam 1: atomic theory/structure how are different elements identified o…
the number of protons
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which two options are forms of kinetic energy? a. thermal energy b. gra…
A. Thermal energy, D. Sound energy
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1. a horizontal row of the periodic table is usually referred to as a a…
1. b. Period 2. a. solid 3. c. physical;chemical 4. a. A compound 5. d. hydrogen
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exam 1: atomic theory/structure which idea of daltons is no longer cons…
Atoms of the same element are all identical.
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exam 1: atomic theory/structure in jj thomsons experiment, ____________…
B. cathode ray tube, plum pudding
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exam 1: atomic theory/structure isotopes are atoms of the same element …
C. neutrons
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exam 1: atomic theory/structure how many protons does phosphorus - 31 c…
A. 15
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exam 1: atomic theory/structure if an atom has lost 2 electrons to beco…
+2 (corresponding to the fourth option)
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exam 1: atomic theory/structure how many neutrons does zinc - 70 contai…
40 (corresponds to the second option)
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exam 1: atomic theory/structure for an atom to be electrically neutral,…
C. protons and electrons
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question 10 (1 point) listen isotopes are atoms of same element which c…
4) More neutrons as compared to other atoms of the same substance
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exam 1: atomic theory/structure silicon - 30 contains 14 protons. how m…
D. 14
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you turn on a light in a room to read a book. not all the energy from t…
A. It is transformed into thermal energy.
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exam 1: atomic theory/structure what is the nuclear composition of uran…
D. 92 protons + 143 neutrons
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exam 1: atomic theory/structure atoms that have unequal amounts of prot…
B. ions
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question 4 (1 point) listen an atom of an element has 10 protons. there…
3) Equal to 10
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which of the following is biochemistry? 1) study of medicines 2) study …
2) Study of chemical processes that occur in living systems
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exam 1: atomic theory/structure which best describes the current (quant…
Atoms are composed of electrons in a cloud around a positive nucleus.
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question 1 (1 point) listen chemistry is called central science because…
1) True
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isotope2. different isotopes of the same element must have different __…
D. numbers of neutrons, E. mass numbers
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question 9 (1 point) listen elementname1. which element has the symbol …
C. iron
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question 8 (1 point) charge3. how many electrons are in a ti⁴⁺ ion? 20 …
B. 18
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violet has noticed that shes been feeling sick around one of the chemic…
Yes
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question 7 (1 point) charge1. how many electrons are in a cu²⁺ ion? 65 …
B. 27
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question 6 (1 point) listen particle7. the position of an atom in the p…
the number of protons in the atom
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question 5 (1 point) massnumber3. how many neutrons are in a $^{60}co$ …
E. 33
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question 4 (1 point) listen symbol4. the symbol for the element chlorin…
D. Cl
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question 3 (1 point) listen periodictable2. select all the correct stat…
B. It is in Group 2A, C. It is an alkaline earth metal
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question 2 (1 point) listen periodictable3. select all the correct stat…
It is in Group 3A. It tends to form a stable ion with a +3 charge.
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elementcompound4. select all the element(s) from the following substanc…
Si, Br₂
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question 7 (1 point) isotope4. a fictional element has two isotopes. is…
D. 34
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question 6 (1 point) elementname4. which element has the symbol of na? …
C. sodium
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unit exam - states of matter and phase changes sublimation is when a so…
Freeze - drying food by turning ice directly into water vapor
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question 9 (1 point) periodictable7. select all the period 4 transition…
C. Cr, D. Zn
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condensation is when a gas loses energy and becomes a liquid. when a ga…
Droplets forming on a window after a hot shower
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question 8 (1 point) listen periodictable6. select all the correct stat…
- It is a noble gas. - It does not like to lose or gain any electron. It tends to stay neutral.
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question 4 (1 point) periodictable4. select all the correct statement(s…
It is a nonmetal.
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question 5 (1 point) symbol5. the symbol for the element copper is ____…
Cu
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matter is made up of particles and can take the form of a solid, liquid…
The particles move freely.
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elementcompound1. select all the element(s) from the following substanc…
1. $\text{O}_2$, $\text{P}_4$, $\text{He}$
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question 10 (1 point) listen elementcompound3. select all the compound(…
B. PF₅, D. CaCO₃, E. CO₂
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question 1 (1 point) symbol5. the symbol for the element copper is ____…
E. Cu
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charge13. the charge of an atom is determined by which of the following…
A. number of electrons, C. number of protons
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question 9 (1 point) charge5. what is the charge on a silver ion that c…
C. +3
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sublimation is when a solid gains energy and becomes a gas, skipping th…
Liquid
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question 8 (1 point) elementname8. which element has the symbol of sr? …
C. strontium
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question 3 (1 point) charge7. what is the charge on a sulfur ion that c…
- 2
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isotope6. element copper has two major isotopes, cu - 63 and cu - 65. t…
- Cu - 63 is more naturally abundant than Cu - 65. - Cu - 63 has fewer neutrons than Cu - 65.
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question 2 (1 point) massnumber1. a copper atom has 27 electrons and 34…
The mass number of an atom is the sum of the number of protons and neutrons. In a neutral atom, the number of electrons is equal to the number of protons. Given 27 electrons, ther…
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question 6 (1 point) listen massnumber6. an atom has 24 neutrons and a …
D. Ti
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question 1 (1 point) particle6. the charge of an atom is the same as th…
the number of protons minus the number of electrons
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question 5 (1 point) periodictable6. select all the correct statement(s…
C. It does not like to lose or gain any electron. It tends to stay neutral. D. It is a noble gas.
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matter is made up of particles and can take the form of a solid, liquid…
The particles move freely.
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matter is made up of particles and can take the form of a solid, liquid…
They move very fast.
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1. an element is a substance made of into another substance. it cannot …
1. An element is a substance made of only one - type of atom. It cannot be broken down into another substance. 2. A substance made of two or more different types of atoms that are…
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what kinds of substances can leaching carry downward through the soil? …
nutrients, pesticides, and synthetically based chemicals
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the selections states there have been changes in the way paper is made …
A. People today are careful to plant new trees to replace those that are cut down. E. Today there are strict laws to keep the lakes and rivers clean.
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how many significant figures are represented in each of the examples? a…
a. 4 b. 4 c. 4 d. 5 e. 2
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based on what you read, what is wastewater? a a type of thick glue used…
D. a kind of dirty water that is created when a paper mill makes paper
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before you start reading... here are the vocabulary words that will be …
contaminating radiation
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how does chemical weathering occur? by chemically breaking down rocks b…
by chemically breaking down rocks by water and gases
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which of these describes physical weathering? minerals in rocks being b…
rocks being broken down by freezing and thawing
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tree roots can break down rock into soil. which type of weathering is t…
Physical
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which drug contains the chemical thc and affects specific receptors in …
# Breve explicación: El THC (tetrahidrocannabinol) es el principal compuesto psicoactivo del cannabis, comúnmente conocido como marihuana. Este compuesto interactúa con receptores…
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2. how many cu atoms are there in 7.55 g cu?
$7.16\times 10^{22}$
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select all statements that are true about protons. they are negatively …
- They are located in the nucleus - They have a mass of 1 amu - The number of protons gives the atom its identity
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which of the following statements about electrons is correct? they are …
They are negatively charged and dictate chemical properties.
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poetry spenser invented a form called the spenserian _, a variation on …
Spenser: stanza; Petrarchan; 3; rhyme - scheme; archaic; grand; virtues Sidney: critical works; superior; captures Shakespeare: plays; sonnets
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famous poets and their sonnets francesco petrarch petrarchs poetry cent…
Francesco Petrarch: love Sir Thomas Wyatt: influenced Edmund Spenser: most; Cambridge; circle; poetry; sonnet; Italian; three; rhyme - scheme; archaic; elevated; virtues Sir Phili…
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1. the following are hypothetical elements (letters b - p) in the perio…
# Explanation: ## Paso 1: Interpretar configuraciones electrónicas Para identificar elementos a partir de configuraciones electrónicas, se usan las reglas de llenado de orbitales.…
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name ______________ sept 5 warm up use factor - label (dimensional anal…
$BaCl_2<BaF_2<MgCl_2$
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all of the chemical reactions that occur in the body are called metabol…
A. True
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9. what makes a homogeneous mixture unique? a. components can be visibl…
9. C. Components are uniformly distributed throughout 10. D. Protons and neutrons
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5. what are the three main states of matter? a. plasma, solid, and liqu…
5. D. Solid, liquid, and gas 6. C. Two or more elements chemically bonded together 7. A. Trail mix 8. B. Orbiting around the nucleus
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2. which statement best describes matter? a. anything that has weight o…
2. C. Anything that has mass and takes up space 3. A. Mass is the quantity of matter, while weight is a gravitational force 4. B. Something with uniform chemical properties and fi…
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infoseek engineering discussion notes 1. what is engineering? 2. what i…
1. Engineering is the application of scientific and mathematical knowledge to practical ends such as the design, manufacture, and operation of structures, machines, systems, and p…
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11. negatively charged subatomic particles in an atoms nucleus. a. elec…
11. a. Electron 12. c. pH 13. c. Solvent 14. b. Acids
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8. weak electrostatic bonds formed by the attraction of opposite charge…
8. a. Hydrogen Bonding 9. c. Atom 10. c. Proton
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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.