化学
化学反応、化学量論、分子構造、元素の性質。
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question 7 of 10 which of these statements is true of rocket flight but…
C. It has the ability to create lift in a vacuum.
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if an engineers greatest concern is easy maintenance of a rocket throug…
A. Solid chemical fuel
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question 1 of 10 which term below describes the study of how energy is …
D. Thermodynamics
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how can a reaction with a negative value of $delta g^{0}$ be described?…
A. As spontaneous
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question 26 of 27 the temperature of 500 ml of water is 16°c. what happ…
B. The temperature of the water increases because the average kinetic energy of the water molecules increases.
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you need to calculate the enthalpy change ($\\delta h^{\\circ}$) of the…
A. $\Delta H^0=\Delta H^0_1-\Delta H^0_2$
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question 24 of 27 for a phase change, $delta h^{0}=2 kj/mol$ and $delta…
B. $\Delta G=-6.5\ kJ$; spontaneous
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question 23 of 27 the enthalpy of a reaction is -394 kj/mol. how would …
A. Exothermic
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question 7 (10 points) choose an element and imagine that it has a care…
Iron can be thought of as a hard - working and strong element. It could have a "career" in construction, being used for building frameworks. It is busy due to its wide industrial …
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question 22 of 27 what are the signs of the enthalpy (δh) and entropy (…
A. -$\Delta H$, +$\Delta S$
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question 20 of 27 which is characteristic of an exothermic reaction? a.…
C. Material releases heat to its surroundings.
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question 6 (3 points) which element in group 6 is found in emeralds and…
B. Chromium (Cr)
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question 19 of 27 what must happen for water to boil at a given pressur…
A. The water must gain thermal energy from its surroundings.
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at 298 k, $delta h^{0}=46$ kj/mol and $delta s^{0}=0.097$ kj/(k·mol). w…
D. 17 kJ
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which alkaline earth metal produces the red color seen in fireworks? o …
D. Strontium (Sr)
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write a lewis structure for the formate ion (hco₂⁻). include all resona…
The bond order of the $C - O$ bonds in the formate ion ($HCO_2^-$) is 1.5. The resonance hybrid structure has a carbon atom double - bonded to one oxygen and single - bonded to th…
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question 16 of 27 the diagram below shows how the potential energy chan…
B. The reaction is exothermic because the energy of the $CO_2$ and $H_2O$ is less than the energy of the $C_3H_8$ and $O_2$.
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for a reaction, $delta h^0 = 206 kj/mol$ and $delta s^0 = 0.215 kj/(kcd…
B. At temperatures greater than 958 K
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question 4 (3 points) is arsenic (as) a metal, non - metal, or metalloi…
C. Metalloid
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question 13 of 27 at what temperatures is a reaction that has a positiv…
B. At all temperatures for exothermic reactions
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question 3 (3 points) what element from group 15 may have been used to …
C. Arsenic (As)
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question 12 of 27 what happens to water as it boils? a. the intermolecu…
C. The energy that is absorbed overcomes the intermolecular forces that hold the molecules together.
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how is hesss law used to calculate the enthalpy change of a reaction? a…
A. The enthalpy changes of each step of the reaction are added together.
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question 10 of 27 what is the change in enthalpy of the first reaction …
C. -112 kJ
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question 8 of 27 the reaction below shows how the potential energy chan…
C. The change in enthalpy is negative, and the reaction is exothermic.
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question / of 2/ what is the best definition of the enthalpy of formati…
C. The energy required for a molecule to form from its elements
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question 2 (3 points) find one element named after a planet. list its n…
Name: Uranium; Period: Seventh period
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question 6 of 7 for a reaction, δh = -286 kj. when is the reaction spon…
B. When $T\Delta S > 0$
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search the table use the periodic table to answer the following questio…
C. Tantalum (Ta)
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question 4 of 27 during a reaction, the enthalpy of formation of an int…
D. -572 kJ
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question 3 of 27 the thermochemical equation for the reaction in which …
B. It is endothermic.
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what volume of gold would be equal in mass to a piece of copper with a …
$63.1$
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heptane and water do not mix, and heptane has a lower density (0.684 g/…
$10.2$
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what is the correct formula for a compound containing strontium and pho…
C. $Sr_3P_2$
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what is the formula for a beryllium atom achieves noble gas configurati…
Be⁺²
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7 multiple choice 1 point which of the following is likely to form an i…
Potassium and Fluorine
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question 6 of 9 a fume hood is primarily used in a laboratory to: provi…
Minimize exposure to hazardous airborne substances.
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what do we call a positively charged ion proton anion positron cation
D. cation
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question 5 of 9 what is the primary purpose of an emergency eyewash sta…
To flush chemicals out of a person's eyes.
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how many electrons are transferred in the compound mgf₂ 8 16 1 2
D. 2
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4 multiple choice 1 point what is the correct formula for a compound co…
D. $MgSO_{4}$
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what is a fundamental rule regarding food and beverages in a laboratory…
They should not be consumed or stored in areas where chemicals are handled.
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what is the correct name for the following compound: (nh4)3po4 ammonium…
D. Ammonium Phosphate
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question 2 of 9 which of the following is generally recommended for foo…
Closed-toe shoes that cover the entire foot.
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2 multiple choice 1 point what is the correct name for the following co…
A. Barium Bromide
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the electron configuration for a fluorine ion is... 1s²2s²2p⁶ 1s²2s²2p⁵…
$1s^{2}2s^{2}2p^{6}$
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10 multiple choice 1 point how can land pollution harm the environment?…
B. All of the above
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reactivity quick check which elements would react most easily with each…
an element with a high electronegativity and an element with a single valence electron
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20. atoms are the smallest unit of matter that retain chemical properti…
True
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19. compounds are made of two or more different elements. true false cl…
True
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which element listed would have the greatest electronegativity? (1 poin…
Bromine
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how are reactivity and electronegativity related? (1 point) elements wi…
An element will be more reactive if it has a very high or very low electronegativity
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reactivity quick check which elements on the periodic table are the lea…
the group with helium at the top
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10. a substance made of only one type of atom is a: element compound mi…
A. Element
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9. which of the following is a chemical change? burning wood melting ic…
Burning wood
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reactivity quick check which element would have the lowest electronegat…
an element with a small number of valence electrons and a large atomic radius
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8. the law of conservation of matter states: matter can be created matt…
Matter cannot be creating or destroyed
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6. solar energy is an example of potential energy chemical energy elect…
C. Electromagnetic radiation
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part i. matching: match the choices to the statements. use each choice …
1. B. Atomic Number 2. T. Synthetic 3. Q. Radioactive 4. I. Mendeleyev 5. P. Proton 6. C. Atoms 7. F. Element Family 8. N. Period 9. H. Liquid 10. E. Elements 11. L. Mixture 12. G…
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1. which of the following is an example of a compound? oxygen (o) gold …
C. Water (H₂O)
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6) a gas has a density of 1.23 g/l. what would be the density of the ga…
1230 μg/mL
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return all unused chemicals to their original containers. false true
A. False
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2.3 identify each of the following as either an atom, element, molecule…
a. Compound b. Element c. Atom d. Element e. Molecule
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match the description to the appropriate chemical family. alkali metals…
1. transition metals - makes up the d - block of the Periodic Table, these are used as catalysts for chemical reactions 2. alkali metals - most reactive of all metals, chemical re…
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lab safety when you perform an experiment at home or school, your first…
1. wash 2. directions 3. organized 4. safety equipment 5. safety goggles 6. eat or drink 7. spill 8. flame 9. long hair 10. sharp 11. well - lit 12. unclosed 13. heat - resistant …
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1. **explain the difference between heterogenous and homogeneous mixtur…
1. Homogeneous mixtures look uniform macroscopically; heterogeneous mixtures have visible different parts. 2. Homogeneous mixtures have evenly - distributed particles at the nanos…
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valence electrons interact with the outermost electrons of other atoms …
the outermost electrons of other atoms
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when you perform an experiment at home or school, your first priority s…
1. wash 2. directions 3. organized 4. safety equipment 5. safety goggles 6. eat or drink 7. spill 8. flame 9. long hair 10. sharp 11. well - lit 12. unapproved 13. heat - resistan…
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what are valence electrons? the electrons in the electron cloud the ele…
the electrons in the energy level furthest from the nucleus
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the noble gasses are very unreactive are likely to spontaneously catch …
Son muy inreactivos.
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elements in group 17 are called the halogens. these elements - react wi…
reaccionan con metales para formar sales
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elements within the same family share similar: facial features physical…
# Breve explicación: En la tabla periódica, los elementos de la misma familia tienen propiedades físicas y químicas similares. # Respuesta: physical and chemical properties
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part 3: match each diagram with its correct description. diagrams will …
| Column A | Column B | Column C | |--|--|--| | 1. Summer Sausage | HM | Texture, Color | | 2. Steam | C | Density, Boiling Point | | 3. Salt Water | S | Conductivity, Density | |…
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multiple - choice question the periodic table is organized into 18 diff…
groups or families
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who was credited with developing the first periodic table and in what y…
Dmitri Mendeleev en 1869
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managerial work in finance and insurance use the information below to a…
chemistry and artistic skills
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e - cigs can have the same cancer causing chemicals as cigarettes.
RIGHT
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vape smoke could expose you and your pets to toxic chemicals like forma…
RIGHT
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when you perform an experiment at home or school, your first priority s…
1. wash 2. directions 3. organized 4. safety equipment 5. safety goggles 6. taste 7. spill 8. flame 9. long hair 10. sharp 11. well - ventilated 12. broken glass 13. heat - resist…
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which period or style of greek sculpture represents the greeks first at…
- Question 1: C. Archaic - Question 2: False - Question 3: False
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multiple choice 1 point what particle(s) is/are found outside the nucle…
D. Electrons
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what images are those in which the object or scene is not easily identi…
1. D. Abstract 2. False 3. Nephrite
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what images are those in which the object or scene is not easily identi…
- First question: D. Abstract - Second question: False - Third question: Nephrite
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wu: history of the atom multiple answer 1 point which of daltons postul…
C. All atoms of an element are identical, having the same size, mass, and chemical properties. D. Atoms cannot be created, divided into smaller particles, or destroyed.
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select the independent clause. frozen foods may lose water molecules an…
Frozen foods may lose water molecules and become dehydrated
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column a lists a substance. in column b, list whether the substance is …
| Column A | Column B | Column C | |--|--|--| | 1. Summer Sausage | HM | texture, color | | 2. Steam | S | temperature, pressure | | 3. Salt Water | S | density, boiling - point |…
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which major branch of chemistry would be most concerned with studying t…
A. organic
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homeworks learning cycle 1 pre - assessment puntos posibles: 2.67 fill …
Chemical; Light; Sound; Heat
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fireworks learning cycle 1 pre - assessment puntos posibles: 1.33 carbo…
6 protons, 6 electrons, 6 neutrons
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fireworks learning cycle 1 pre - assessment puntos posibles: 0.57 what …
the number of outermost electrons
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part 2: classify each of the following as elements (e), compounds (c) o…
Diamond (C): E Air: M Krypton (K): E Water (H₂O): C Ammonia (NH₃): C Wood: M Dry Ice (CO₂): C Sugar (C₆H₁₂O₆): C Sulfuric Acid (H₂SO₄): C Bismuth (Bi): E Alcohol (CH₃OH): C Salt (…
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fireworks learning cycle 1 pre - assessment match each subatomic partic…
protons - positive neutrons - neutral electrons - negative
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question 8 of 10 what was the plum - pudding atomic model? a. a descrip…
B. A description of electrons scattered inside the atom
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under certain conditions, the substance water can be broken down to for…
27 grams
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question 7 of 10 which of the following ideas did john dalton teach? a.…
A. That matter was made of indivisible particles
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under certain conditions, zinc oxide and water combine to form zinc hyd…
37.1307 grams
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question 5 of 10 what was one main point of daltons atomic theory? a. t…
D. That atoms made up the smallest form of matter
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in the following equation for a chemical reaction, the notation (s), (l…
$O_2(g)$: reactant $SO_2(g)$: reactant $SO_3(g)$: product When the reaction takes place, energy is released.
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in the following equation for a chemical reaction, the notation (s), (l…
$CO(g)$: reactant $H_2(g)$: reactant $CH_4(g)$: product $H_2O(g)$: product The reaction is exothermic, so energy is released.
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in the following equation for a chemical reaction, the notation (s), (l…
$CO(g)$: Reactant $H_2(g)$: Reactant $CH_4(g)$: Product $H_2O(g)$: Product The reaction is exothermic (energy is a product).