Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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significant figures exit slip name: jeremiah d per: ______ directions: …
3 ### Problem 2: 7.056 (Number of Significant Figures)
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question: which piece of scientific evidence might disprove the capture…
The age and rock chemical composition of both bodies.
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use this key to fill in the missing information in the element squares …
To solve this, we use the periodic table's structure (period = row, group = column, family = similar properties). Let's take an example (e.g., Mercury, Hg): ### Step 1: Identify M…
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question 19 of 20 : select the best answer for the question. 19. what i…
B. Methane levels decreased and oxygen levels increased, promoting aerobic life forms.
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what radioactive element has the lowest atomic number? tc how many of t…
Technetium (Tc) (atomic number 43) or Hydrogen - 3 (tritium, atomic number 1, radioactive isotope). If considering elements (not isotopes) with no stable isotopes, Technetium (Tc)…
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question 8 of 20 : select the best answer for the question. 8. why is o…
D. It completely removes any available topsoil. (Note: There is an error in the above analysis. The correct answer is D. Open - pit mining, also known as strip mining, involves th…
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question 4 of 20 : select the best answer for the question. 4. how does…
B. By blocking fish migration
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what is the short form used to illustrate a rhyme scheme? (1 point) ○ a…
B. a series of capital letters
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the rda for the trace element selenium is 0.000070 g/day. express this …
\(0.070\space mg/day\)
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a typical multivitamin tablet can contain 2.0 mg of vitamin b₂ (ribofla…
\(2\)
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the recommended daily allowance (rda) of the trace metal magnesium is 4…
410000
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11. give an example of each of the following: a) a heterogeneous mixtur…
- a) Heterogeneous mixture: Salad (lettuce, tomatoes, cucumbers) - b) Homogeneous mixture: Salt - water solution - c) Element: Oxygen ($O_2$) - d) Compound: Water ($H_2O$) - e) Ph…
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10. classify the following as heterogeneous mixtures or homogeneous mix…
To solve this, we recall: A **homogeneous mixture** has a uniform composition throughout (solution, colloid if uniform), while a **heterogeneous mixture** has non - uniform compos…
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8. if the combination of iron filings and sulfur in question 7 is heate…
This is a pure substance (specifically a compound). Because iron and sulfur reacted chemically to form iron sulfide, which has a fixed chemical composition and distinct properties…
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a student is testing the boiling point of an unknown liquid. he calcula…
If we assume the error is a positive error (experimental value is higher than theoretical), the experimental boiling point is $\boldsymbol{81^\circ\text{C}}$. If we assume negativ…
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5. what is a compound? what are compounds composed of? what is true abo…
- A compound: A pure substance formed when two or more different elements chemically combine in a fixed proportion. - Composed of: Atoms of two or more different elements, held to…
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the molecules in a solid lump of sugar do not move. true or false
False
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classify each of the following as a physical change or property, or a c…
To solve this, we need to recall the definitions: - **Physical change**: No new substance formed (e.g., phase change, color change without reaction). - **Chemical change**: New su…
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classify each of the following as a physical change or property, or a c…
**: Chemical Property ### b)
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1. what are the two characteristic properties of matter? 2. ______ has …
Mass and Volume ### Question 2: ______ has a definite volume but takes the shape of its container
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kealey will participate in a classroom discussion in which students sha…
A. bringing notes about her findings C. reading and reviewing classroom materials D. supporting her findings with evidence
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within the periodic table, elements are organized consecutively by 1 po…
atomic number within rows
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define covalent bond 1 point options: - when two atoms share electrons …
The correct option is: When two atoms share electrons
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is it easier for elements like carbon and nitrogen to share electrons, …
Share
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define ionic bond 1 point options: - when two atoms share electrons equ…
The option "When two ions of opposite charge are attracted to each other and sit next to each other" (the first option in the second column of the given choices).
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do any of the elements have the same number of protons?
No (the option labeled "No")
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do any of the elements have the same atomic number? yes no 1 point
No. (with the corresponding radio button selected for "No")
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is the mass of the electrons taken into account when we measure atomic …
No
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what subatomic particle is found floating around the nucleus of an atom…
Electron (the option labeled "Electron")
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chemistry worksheet - scientific notation, significant figures, units &…
### Question 1: Write each number in proper scientific notation #### Part A: 450,000 # Explanation: ## Step 1: Move decimal to get \( 1 \leq a < 10 \) Move decimal 5 places left: …
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mastery view predictive assessments english ii questions 16-17 refer to…
B. by using allusion to a historic battle to examine ideas of bravery and sacrifice
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question: seawater contains salt, a/an ___ molecule that consists of a …
ionic
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calculate the total number of electrons that can occupy the following o…
s: Part 1: \( \boldsymbol{14} \) Part 2: \( \boldsymbol{2} \)
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give all the possible values of the four quantum numbers of an electron…
- \(n\): \(4\) - \(l\): \(1\) - \(m_l\): \(- 1,0, + 1\) - \(m_s\): \(\frac{1}{2}\) or \(-\frac{1}{2}\)
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select the quantum numbers associated with the 5d orbital. principal qu…
- Principal quantum number (\(n\)): \(5\) - Angular momentum quantum number (\(l\)): \(2\) - Possible magnetic quantum numbers (\(m_l\)): \(-2, -1, 0, +1, +2\)
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which type of elements have fewer valence electrons? nonmetals metals
metals
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what does ductile mean? they can be made into wire. the can be pounded …
They can be made into wire.
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valence electrons are the electrons in the d and f sublevels the electr…
B. the electrons in the highest energy level (s/p)
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consider the bohr model of an atom. part 1 of 2 complete the following …
### Part 1 Explanation (already answered correctly as "absorbed" for electron moving from lower to higher energy orbital, since energy is needed/absorbed for the electron to jump …
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consider the bohr model of an atom. part 1 of 2 complete the following …
absorbed (For Part 2, since the content is not provided, we can't answer it. If you provide the content of Part 2, we can give a corresponding answer.)
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he rearranged the periodic table using atomic mass density atomic numbe…
atomic mass
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part c : identify & draw 8) label the pictures with the words. remember…
### 1. Análisis de la imagen 1 (número 1) - **Observación**: Hay varias moléculas idénticas (cada molécula es un par de átomos blancos). - **Clasificación**: Es una sustancia form…
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15. suppose the writer’s primary purpose had been to offer an example o…
D. No, because it explains that triangular snowflakes appeared to, but don’t actually, violate the basic laws of chemistry.
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which process is used to separate soluble compounds from insoluble comp…
B. Filtration
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the formula for the ionic compound formed between calcium ions and chlo…
C. Calcium and chloride ions exist in a 1:2 ratio in a crystal of \(CaCl_2\)
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question 7 of 16 points possible: 1.00 identify each described physical…
Filtration ### Second Description:
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multiple-choice question the reaction that cooks your meal is – enthalp…
D. endothermic
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multiple-choice question which best describes a burning campfire? □ end…
C. exothermic and an increase in entropy
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multiple-choice question what type of entropy is likely to help a chemi…
D. high entropy with lots of randomness/disorder
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multiple-choice question a measure of a chemical’s randomness is called…
D. entropy
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rs a chemical reaction? - kareem jarrah image with caption: \because th…
C. exothermic reactions are more likely because they require less energy (assuming the third option is labeled C, if the options are A - D with the third being C, the full option …
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reaction? - kareem jarrah of the proteins in the eggs and various compo…
B. the energy in the products is more than in the reactants
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select the correct answer. which professional is displaying positive wo…
D. a chemistry teacher who stays after class to help students understand a challenging topic
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select the correct answer ricky works outdoors. he faces rough weather,…
C. construction
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in an exothermic reaction... the energy in the products is the same as …
B. the energy in the products is less than in the reactants
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what triggers a chemical reaction? - kareem jarrah ted ed the hole repr…
B. added, released
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question 10 what term matches the definition below? the basic chemical …
d. Combustion Cycle ### Question 11
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multiple-choice question where is potential energy stored in a molecule…
B. In the chemical bonds between the atoms
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3. how many molecules are there in 216 g of ascorbic acid, c₆h₈o₆? (mol…
D. \( 7.39 \times 10^{23} \) molecules
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activity: understanding elements, compounds and mixtures at the particl…
### Part 1: Matching Descriptions to Boxes #### 1. Element An element consists of only one type of atom. Box B has only one type of particle (triangles), so it represents an eleme…
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question 2 / 14 is the following a chemical or physical property of mat…
B. physical
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question 1 / 14 is the following a chemical or physical property of mat…
B. physical
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7. how many sodium atoms are there in 6.0 g of sodium nitride, na₃n? (m…
A. \( 1.3 \times 10^{23} \) atoms
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6. what is the mass in grams of 0.732 mol of glucose, c₆h₁₂o₆? (molar m…
C. 132 g
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which proposal best demonstrates a refined solution for reducing the ne…
Creating buffer zones of native plants around fields to reduce runoff and provide habitat for wildlife.
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5. consider the following four compounds. which ones are ionic compound…
E. II and III
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1) today’s pressure is 29.71 inches of mercury. standard pressure is 29…
Approximately \(\boxed{644}\) grams (the exact value may vary slightly depending on rounding during calculations)
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4. element x has two naturally occurring isotopes of masses 106.905 amu…
B. 107.9 amu
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3. which of the following represent isotopes? a. (ce{^{40}_{18}ar}) and…
B. $\ce{_{6}^{12}C}$ and $\ce{_{6}^{13}C}$
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1) today’s pressure is 29.71 inches of mercury. standard pressure is 29…
To solve the problem, we need to determine the mass of oxygen in the room using the ideal gas law. However, we notice that the volume (\(V\)) of the room and the temperature (\(T\…
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78% of the air we breath is ______. ○ $n_2$ gas ○ oxygen ○ carbon ○ arg…
A. \( N_2 \) Gas
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8 le modèle de dalton compare les atomes aux blocs d’un jeu de construc…
Atoms and construction blocks are both fundamental, indivisible (in their role of building) units that combine to form larger entities: atoms combine to form molecules/compounds, …
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periodic table basics practice mark all that are made of diatomic molec…
- Bromine - Hydrogen - Nitrogen - Chlorine
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match the description to the element alkali metal with an atomic number…
### 1. Alkali metal with atomic number 19 - Atomic number 19 means 19 protons. Alkali metals are Group 1. Element: K (Potassium). ### 2. Most common mass number 70 - Mass number =…
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periodic table basics practice mark all that are correct about the elec…
- A neutron has no effect on a proton - A neutron exerts no electromagnetic force
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periodic table basics practice mark all that are correct about the elec…
- Electrons attract protons - A nucleus repels protons - A nucleus attracts electrons - An anion attracts a cation
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periodic table basics practice mark all that are correct about the elec…
- Opposite charges attract - Same charges repel - Two protons repel each other - Two electrons repel each other
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adapted from presidential retreat by the national parks service camp da…
It connects ideas in the text by explaining how the evidence relates to the argument
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has the largest atomic mass only alkali metal with no stable isotopes a…
To solve these matching problems, we analyze each clue: 1. **Largest atomic mass**: Typically, elements like Oganesson (but in common context, maybe Radon? Wait, no—Uranium? Wait,…
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periodic table basics practice match the description to the element ato…
To solve this, we match each description to the element using known atomic/mass numbers: 1. **Atomic mass of 91.224** → Zirconium (Zr) (atomic mass ~91.224) 2. **Atomic Mass of 11…
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periodic table basics practice choose all that apply to mercury □ trans…
- Transition Metal - Group 12 - 6 electron energy level - Period 6 - Same period as erbium - Same group as zinc - 80 protons - Liquid at room temperature
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periodic table basics practice choose all that apply to europium transi…
- Member of the lanthanide series - Period 6 - Unstable
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which of the following could not form an ionic compound? check all that…
The pairs that could NOT form an ionic compound are $\ce{F-}$ and $\ce{O^{2-}}$, $\ce{Ba^{2+}}$ and $\ce{Ag+}$.
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periodic table basics practice choose all that apply to plutonium □ tra…
- Transition Metal (checked) - 7 electron energy level (checked) - Member of the actinide series (checked) - Same period as seaborgium (checked) - Unstable (checked) (The other op…
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calculate the amount of heat needed to boil 24.0 g of water (h₂o), begi…
\( \boxed{59.0 \, \text{kJ}} \)
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periodic table basics practice choose all that apply to iridium ☐ trans…
- Transition Metal - Group 9 - 6 electron energy level - 77 protons - Same period as europium - Same group as cobalt - Same period as rubidium (Note: Rubidium is in Period 5, Irid…
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periodic table basics practice choose all that apply to silver transiti…
- Transition Metal - 5 electron energy level - 47 protons - Atomic mass of 107.868 - Same group as copper - Same period as xenon - Forms cations when reacting - Symbol is Ag
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17. explain the meaning of significant when describing an earth process…
A delta is formed when a river enters a standing body of water (e.g., ocean, lake). The river's velocity decreases, causing it to deposit the sediment (sand, silt, clay) it was ca…
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take electrons gasses at room temperature 7 elements along the metalloi…
To solve this matching problem, we analyze the properties of Metals, Metalloids, and Nonmetals: ### Metals: - **Groups 1 - 12**: Metals are in these groups. - **To the left of the…
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to the right of the metalloid line; medium amount of valence electrons;…
To solve this matching problem, we analyze each left - hand statement and match it with the appropriate right - hand concept (assuming the right - hand concepts are about metals, …
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question 5 what term matches the definition below? an undergraduate aca…
c. Bachelor’s Degree ### Question 6
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how does a pure substance differ from a mixture? check all that apply. …
- Every sample of a given pure substance has exactly the same characteristic properties. - Every sample of a given pure substance has exactly the same composition.
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nder – 200s (image of a graduated cylinder with markings: 40, 80, 120, …
195 mL
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if a sample of matter can not be separated and can not be decomposed by…
D. an element
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which of the following could form an ionic compound? check all that app…
A. $\ce{Na+}$ and $\ce{F-}$ C. $\ce{Cl-}$ and $\ce{K+}$
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if a sample of matter can be separated and is not uniform in compositio…
C. a heterogeneous mixture
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magnesium, bromine, silicon, uranium, hydrogen, helium, boron, arsenic,…
To solve this, we classify each element into Metal, Nonmetal, or Metalloid: ### Step 1: Recall Element Categories - **Metals**: Typically shiny, good conductors (e.g., Mg, U, Pt, …
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ing with a grad owing graduated cylinders and determine the image of a …
60 mL
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only metal that is liquid at room temperature only nonmetal that is liq…
1. Only metal that is liquid at room temperature: Mercury 2. Only nonmetal that is liquid at room temperature: Bromine 3. Solid halogen with the smallest atomic mass: Iodine 4. Ga…
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ylinder - 10s (and a graduated cylinder diagram with markings 2, 4, 6, …
3 mL