化学
化学反应、化学计量、分子结构与元素性质。
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london forces dipole dipole forces hydrogen bonds all of the above
D. All of the above
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the energy in coal is used to make electricity. how is the energy store…
A. In chemical bonds
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question 4 (1 point) what intermolecular bonds can occur between ammoni…
The intermolecular bonds that can occur between ammonia ($\ce{NH_3}$) molecules are London Dispersion Forces, Dipole - Dipole Interactions, and Hydrogen Bonding.
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question 3 (1 point) which of the following intermolecular bonds is the…
C. London Dispersion forces
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how many neutrons are in the nucleus of a phosphorus atom with a mass n…
16
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a neutral atom has an atomic mass of 16 amu. which particles contribute…
B. Protons and neutrons
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which statement best compares the atoms of two elements that have simil…
B. The atoms of both elements have the same number of valence electrons.
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students are provided a sample of an element with a table describing th…
28.085
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what is the name of the bond between an anion and a cation? ○ non-polar…
D. Ionic
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what are the charge and location of each subatomic particle of an atom?…
| Subatomic Particle | Charge | Location | | --- | --- | --- | | Proton | +1 | Nucleus | | Neutron | 0 | Nucleus | | Electron | -1 | Energy levels |
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what does the bohr model contribute to the theory on the structure of t…
A. Electrons are arranged in specific energy levels around the atom.
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question 10 (1 point) (02.01 mc) rutherford worked under thompson but d…
a. True ### Question 11
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question 7 (1 point) (02.01 lc) what is true of neutrons? ○ a they have…
a. They have no charge and are located inside the nucleus. ### Question 8
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question 4 (1 point) (02.01 lc) match the scientist to his contribution…
1. Thomson - c. Electrons 2. Rutherford - a. Nucleus 3. Bohr - b. Electron energy levels ### Question 5
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question 1 (1 point) (02.01 mc) rutherford’s famous gold foil experimen…
b. Some of the heavy particles bounced off the foil because there is a dense positive area in the atom. ### Question 2
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20 multiple choice 1 point when a patient does not respond to noises or…
deaf (the option corresponding to "deaf") ### Question 21
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your grade is the \highest\ of all attempts. each quiz is worth 20 poin…
philosophy (the option with "philosophy" as the text, assuming the last option is labeled appropriately, e.g., if it's D. philosophy, then D. philosophy)
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3. write the formulas of the compounds formed by combining the followin…
To solve for the formulas of the compounds formed by combining the given ion pairs, we use the principle of charge neutrality. The total positive charge from the cations must equa…
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identify the components of the atom depicted in the image below. atom s…
A. Electron B. Proton C. Neutron D. Nucleus E. Orbit
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what is the rhyme scheme of this excerpt from paul laurence dunbars poe…
A. A, B, A, B
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a tuning fork is vibrating the air around it. what best describes the w…
The correct option is the fourth one: "mechanical, because the vibrating tuning fork makes air molecules around it vibrate" (assuming the fourth option's full text is as described…
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a. copper (ii) sulfite _________ b. iron (ii) cyanide _________ c. sulf…
To determine the chemical formulas for each compound, we use the rules of ionic compound nomenclature (for ionic compounds) and acid nomenclature (for sulfuric acid). Here are the…
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neuroglycopenic symptoms (dizziness, obtunded or altered mental status)…
True ### Second Question (Atom Components)
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which compound will most likely form when an element in group 1 reacts …
C. hydrochloric acid, \(HCl\)
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which of the following measurements was recorded correctly from a gradu…
12.3 mL
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how does solid rock become soil? ○ it falls apart and combines with par…
B. It breaks down and combines with water, air, and organic matter
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fill in the blanks using the choices in the drop - downs. when sugar di…
First blank: homogeneous Second blank: uniformly (or evenly, depending on dropdown options; the key is the concept of uniform mixing in a homogeneous mixture)
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select whether this statement is true or false. lemonade is an example …
false
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matter review identify the following as either physical changes or chem…
### Physical Changes: Dissolving, Melting, Breaking, Boiling ### Chemical Changes: Burning, Rusting, Cooking
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calculate the answer and round to the correct number of sig figs. 7.30 …
5.9
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calculate the answer and round to the correct number of sig figs. 3.32 …
\( 1.1 \)
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calculate the answer and round to the correct number of sig figs. 6.08 …
59.9
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calculate the answer and round to the correct number of sig figs. 7 / 8…
0.8
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calculate the answer and round to the correct number of sig figs. 432.5…
436.02
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grade 7 lesson 8 solve problems with rational numbers 1 to the nearest …
\( -14.96 - 2.9\times 3 \) (or equivalent expression like \( -14.96 + 3\times(-2.9) \)) ### Part B
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calculate the answer and round to the correct number of sig figs. 100 +…
131
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4. both democritus and dalton proposed that matter consists of atoms. e…
J.J. Thomson's cathode - ray tube experiment: A high voltage was applied across electrodes in a vacuum tube. The emitted cathode rays (deflected by electric/magnetic fields, showi…
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matter review select the observations that might indicate a chemical ch…
Production of heat or light, Production of flames
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automatic voter registration schemes may have to win over a few skeptic…
Words like "seamless", "efficient", "peace of mind", or "smoother system" (depending on underlining) have connotations suggesting positive effects of automatic voter registration.…
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calculate the answer and round to the correct number of sig figs. 7.8 x…
43
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matter review fill in the blanks using the choices in the drop-downs. w…
1. First blank: boiling (or vaporization) 2. Second blank: faster (or more freely, or randomly) 3. Third blank: weaker
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calculate the answer and round to the correct number of sig figs. 340.1…
277.10
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matter review honors matter review matter review identify the physical …
### Physical Properties: Solubility, Ductility, Density, Melting point ### Chemical Properties: Toxicity, Flammability, Heat of combustion, Reactivity
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calculate the answer and round to the correct number of sig figs. 2.5 /…
0.27
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calculate the answer and round to the correct number of sig figs. 5.2 ×…
6.2
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a student conducts an experiment to test how the temperature affects th…
C. the temperature of the water (Note: Assuming the options are labeled A - D with A: the amount of water, B: the time stirred, C: the temperature of the water, D: the amount of s…
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calculate the answer and round to the correct number of sig figs. 0.9 x…
2
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matter review if an object has a mass of 0.35 g, what is that mass in c…
35 cg (corresponding to the option "35 cg")
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calculate the answer and round to the correct number of sig figs. 5.9 ×…
35
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4. both democritus and dalton proposed that matter consists of atoms. e…
J.J. Thomson's cathode - ray tube experiment: A high - voltage is applied in a vacuum - sealed tube with cathode and anode. Cathode rays (electron - carrying) are deflected by ele…
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calculate the answer and round to the correct number of sig figs. 3.200…
1.1
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calculate the answer and round to the correct number of sig figs. 0.06 …
\( 0.4 \)
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calculate the answer and round to the correct number of sig figs. 9.5 ×…
6.3
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calculate the answer and round to the correct number of sig figs. 9.1 /…
7.0
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iron (fe) and chlorine (cl) have the following charges. - fe charge = 3…
A. The formula should be \(FeCl_3\). Fe: 1 atom because \(3+\times1 = +3\) Cl: 3 atoms because \(1-\times3 = -3\) \(+3 + -3 = 0\)
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calculate the answer and round to the correct number of sig figs. 7 / 8…
0.8
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calculate the answer and round to the correct number of sig figs. 3.05 …
\( 3.06 \)
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calculate the answer and round to the correct number of sig figs. 2.3 /…
0.48
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identify the molecular geometry illustrated here. options: tetrahedral,…
A. tetrahedral
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name: handwriting date: handwriting class: handwriting unit: atomic str…
Around 400 BCE (ancient Greece, by Democritus). Theory: Matter is made of indivisible, indestructible "atoms" with different shapes/sizes. ### Question 2
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what is the molecular geometry of icl₃? (hint: start with a lewis struc…
A. T - shape
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calculate the answer and round to the correct number of sig figs. 2.05 …
29.8
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what would be the balanced formula for a compound made from beryllium a…
A. \(BeCl_2\)
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ammonia, nh₃, adopts a tetrahedral geometry. however, the non-bonding p…
The actual bond angle is reduced: it is less than $109.5^{\circ}$
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what 3-d vsepr shape does this molecule exhibit? tetrahedral trigonal p…
trigonal pyramidal
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simple binary ionic compounds please complete the following table: | na…
To complete the table for simple binary ionic compounds, we use the rules of ionic compound formation (criss - cross method for charges): ### 1. Sodium bromide - Sodium ($\text{Na…
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what is the molecular geom
Trigonal planar
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karrys teacher gave her two compounds for her to compare and analyze fo…
B. Substance A is most likely an ionic compound because it has a higher melting point than the boiling point of Substance B.
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consider the molecule below. determine the molecular geometry at each o…
The correct option is the one with "C1 = trigonal planar, C2 = tetrahedral" (the teal - colored option among the given choices).
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determine the vsepr shape of the given structure. options: hexahedral, …
Octahedral (the option with the label "Octahedral")
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which molecular geometry is illustrated above? image shows a molecular …
trigonal pyramidal
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what is the molecular shape of the following? image of a molecule with …
Bent
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what is the bond angle between the atoms? options: 120, 180, 107, 104.5…
107
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select the correct answer from each drop - down menu. what effect does …
decreases
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select the correct answer from each drop-down menu. what effect does a …
### Step-by-Step Explanation: #### Step 1: Analyze the first dropdown (effect of [NO] decrease) The rate of a reaction depends on the frequency of effective collisions between rea…
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select the correct answer. giselle is working with a chemical substance…
B. hypothesis
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question 25 of 25 which statement is an example of false causality? a. …
B. Everyone who lives near that factory seems really unhappy. It must give off a dangerous chemical.
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select the correct answer. which substance is a source of hydrocarbons?…
A. natural gas
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select the correct answer. what is the formula of the compound vanadium…
D. \( V_2O_5 \)
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select the correct answer. an ion has a net charge of 3+. if this ion h…
B. 5
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explain why there are more substances on earth than are listed on the p…
Elements from the periodic table can chemically combine in different ways (e.g., different ratios, bonding arrangements) to form compounds. Since there are numerous possible combi…
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use this chemical __fe + __o2 → __fe2o3 what coefficients of fe, o2 and…
D. 4, 3, 2
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drag the tiles to the correct boxes to complete the pairs. match the ch…
- phosphorus monoxide \( \longleftrightarrow \) PO - diphosphorus tetroxide \( \longleftrightarrow \) \( \text{P}_2\text{O}_4 \) - diphosphorus pentoxide \( \longleftrightarrow \)…
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identify each item as either an element or a compound. carbon (c) carbo…
carbon (C): Element carbon dioxide (\(CO_2\)): Compound hydrogen (H): Element sodium chloride (NaCl): Compound
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select all the correct answers. a student is trying to distinguish elem…
A. It can be found on the periodic table E. It is made of only one type of atom
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select the correct answer. which statement best explains how electrons …
B. A pair of electrons belongs to two atoms at the same time.
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select the correct answer. what is the chemical name of the compound cu…
C. copper(II) nitrate
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select all the correct answers. which statements correctly match a chem…
B. The chemical formula for ammonium hypochlorite is \( \text{NH}_4\text{ClO} \) C. The chemical formula for ammonium nitrate is \( \text{NH}_4\text{NO}_3 \)
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select the correct answer from each drop-down menu. in a galvanic cell,…
First drop - down: reduction Second drop - down: oxidation
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drag each tile to the correct image. match each alkane name with its st…
To solve this, we use the general formula for alkanes, \( C_nH_{2n + 2} \), to determine the number of carbon atoms (\( n \)) for each alkane: ### Step 1: Analyze each alkane form…
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drag each tile to the correct box. arrange the elements in order of inc…
F < S < Mg < Ba
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which statement describes an element? check all that apply. an element …
- An element is a pure substance that cannot be broken down into a simpler form. - All elements are listed on the periodic table of elements. - An element symbol begins with a cap…
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drag the tiles to the correct boxes to complete the pairs. match each s…
- plasma $\longleftrightarrow$ This state, in which the particles are at extremely high temperatures, is rarely found on Earth. - gas $\longleftrightarrow$ It expands to fill the …
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select the correct answer from each drop-down menu. what are the chemic…
To determine the chemical name of \( \text{KF} \): ### Step 1: Identify the cation and anion - The cation is \( \text{K}^+ \) (potassium ion, from Group 1, so it has a \( +1 \) ch…
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select the correct answer from each drop-down menu. the subatomic parti…
electrons
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select the correct answer from each drop-down menu. the subatomic parti…
First dropdown: protons and neutrons (Note: The second dropdown, based on atomic structure, should have "electrons" as they travel around the nucleus, but since the options for th…
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instructions review the following diagrams below carefully. you will be…
To solve this, we analyze each diagram based on the definitions: - **Element**: Only one type of atom (same color), either single atoms or molecules of the same atom. - **Compound…
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17. organic solidarity arises from: a. specialization of work and divis…
A. Specialization of work and division of labor in modern societies ### Question 18
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6) by now you should be able to answer the following questions. if not,…
The big 2 in \(2\text{CO}_2\) means there are 2 molecules of carbon dioxide. ### Part 6b
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4) have you noticed some molecules only work in certain arrangements? (…
- Molecule chosen: Water (\(H_2O\)) - Unaccepted arrangement (sketch): Draw three separate atoms (O, H, H) not bonded properly (e.g., H - H and O alone). - Accepted arrangement (s…