Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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part b: understanding concepts 4. fill in the table below with what hap…
| Change of State | Temperature Change | Particle Motion Change | Energy Flow (heat added or removed?) | | --- | --- | --- | --- | | Solid - Liquid (melting) | Constant (at meltin…
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question 19 select the reaction that will require the greatest amount o…
\(F^{+}(g)\to F^{2+}+e^{-}\)
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why is an element considered a pure substance?
An element is considered a pure substance because it is composed of only one type of atom, giving it a uniform and definite composition.
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9. a solution contains 5.85g of sodium chloride dissolved in 5.00×10²ml…
\(0.2\ mol/L\) ### Question 10
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identifying parts of an atom categorize the particles according to whet…
- **Nucleus**: neutral particles (neutrons), positively charged particles (protons) - **Electron Cloud**: negatively charged particles (electrons)
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question 7 of 12 freezing and condensation are ____________. they are g…
Exothermic
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question 6 of 12 one way to tell if a reaction is exothermic is if the …
B. Goes up
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question 5 of 12 alkalis are the same as bases. true false
B. False
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question 4 of 12 exothermic reactions cause the surrounding to _ cool d…
Heat up
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the atomic models after daltons time included ideas about the atomic st…
Schrödinger's model
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scientists have changed the model of the atom as they have gathered new…
A. A few of the positive particles aimed at a gold foil seemed to bounce back.
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rutherford tracked the motion of tiny, positively charged particles sho…
Some particles traveled through empty parts of the atom and some particles were deflected by small areas of high - density positive charge in atoms.
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the passage below describes a process of scientific inquiry. select the…
Lindsey gathered some iron nails and aluminum foil. She prepared a saline solution by mixing salt into water. She then poured equal amounts of the solution into four separate cups…
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what new characteristic did john dalton add to the model of the atom? a…
An atom is a round, solid mass.
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the passage below describes a process of scientific inquiry. select the…
He reasoned that gases, like carbon dioxide, must dissolve differently than solids, like salt and sugar.
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the passage below describes a process of scientific inquiry. select the…
Sophia concluded that the temperature of the water does affect the reaction rate of electrolyte tablets.
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which statement belongs to daltons atomic theory? atoms have a massive,…
Atoms cannot be created or destroyed.
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4. naturally occurring strontium consists of four isotopes, sr - 84, sr…
The average atomic mass of strontium is approximately \(87.71\) u. The average atomic mass of bromine is approximately \(79.91\) u.
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dmitri mendeleev and henry moseley developed their periodic tables abou…
The number of protons in an atom is different than the atom’s total mass.
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what are 1a, 3b, and 7a examples of on the periodic table? groups. numb…
groups.
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this is how osmium appears in the periodic table. rounded to the neares…
114 (the second option)
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while looking at calcium (ca) on the periodic table, a student needs to…
directiy to the right
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in an elements square on the periodic table, the number with the greate…
atomic mass.
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which two chemists organized elements based on properties such as how t…
Lavoisier and Mendeleev
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this is how krypton appears in the periodic table. rounded to the neare…
36
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while developing his periodic table, dmitri mendeleev broke his own rul…
Mendeleev observed that tellurium has chemical properties like other elements in its group, and he did not know that neutrons cause the greater atomic mass.
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the element phosphorus is located to the right of the element magnesium…
Phosphorus has a larger atomic mass.
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in a reaction a + b -----> c, reactant a has 5g and product c has 9g. h…
\(4g\)
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this is how zirconium appears in the periodic table. rounded to the nea…
40
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40 grams of calcium reacts with 71 grams of chlorine to produce _______…
\(111\)
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one isotope of sodium has 11 protons and 7 neutrons. what is the mass n…
18
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everything around you—your desk, your chair, and the people around you—…
No, the amount of mass and matter does not change. According to the law of conservation of matter/mass, matter is neither created nor destroyed during a physical change (like chan…
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a chemical _______ is a written representation of a chemical reaction. …
B. equation
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all large radioactive atoms decay into smaller atoms by emitting alpha …
helium - 4
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the simple model below is a neutral magnesium (mg) atom with the elemen…
It must lose two electrons and become an ion.
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which describes an atom that has fewer neutrons than protons and more e…
negative ion
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what can be added to an atom to cause a nonvalence electron in the atom…
energy
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which of the following observations would indicate a chemical change ha…
- a solid precipitate forms - heat energy is released - a gas is produced
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how many atoms of carbon are in this compound? h₂c₃o₄n₅
3
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______ g of hydrogen reacts with 32 g of oxygen to produce 34 g of hydr…
\(2\)
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question 2 of 10 which of the following describes something an engineer…
B. Identify the need to reduce ocean pollution.
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13. most acids are considered to be _, meaning that they \wear away\, d…
corrosive
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12. match the following: acid a. a compoind that tastes bitter and feel…
Acid - C, Base - A, Neutralization - B
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11. an ________________ is a charged particle which is created when ato…
ion
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10. what name is given to the elements located on the zigzag. this grou…
Metalloids
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a state government is trying to decide what type of energy its state sh…
C. Coal power can be generated both day and night.
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9. name three physical properties of most nonmetals
Poor conductors of heat and electricity, brittle, low density.
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8. name three physical properties of most metals.
Conductivity (electrical/thermal), malleability, ductility.
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7 the ____ of an atom are those electrons that have the highest energy.…
Valence electrons
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5. explain the difference between \groups\ and \periods\ in the periodi…
Groups are vertical columns (18 in total) with similar chemical properties (same valence electrons). Periods are horizontal rows (7 in total) with increasing atomic number across.
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3. how is the modern periodic table organized?
The modern periodic table is organized by atomic number, with elements in periods (rows) ordered by increasing atomic number and in groups (columns) having similar chemical proper…
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2. name the three subatomic particles found in an atom. please include …
The three subatomic particles in an atom are protons (charge \(+1\)), neutrons (charge \(0\)), and electrons (charge \(-1\)).
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adrenaline, also known as epinephrine, is a hormone which plays a role …
C. N
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metals in group 2 of the periodic table can form ionic bonds with eleme…
B. group 17
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q5. what is the primary purpose of a bowie-dick test in a steam sterili…
To detect air leaks and inadequate air removal
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which of these is an advantage of using natural gas? a. it is fairly sa…
A. It is fairly safe for use in homes.
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move the cards to match the name with the correct chemical formula. che…
- $CaCO_3$: calcium carbonate - $K_2CrO_4$: potassium chromate - $CaCl_2$: calcium chloride - $K_2CO_3$: potassium carbonate - $KCl$: potassium chloride - $CaCrO_4$: calcium chrom…
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vanillin is extracted from vanilla beans. its used to flavor ice cream …
- Each hydrogen atom forms \(1\) covalent bond(s) and has \(0\) lone pair(s). - Each carbon atom forms \(4\) covalent bond(s) and has \(0\) lone pair(s). - Each oxygen atom forms …
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calcium carbonate is produced by many aquatic organisms. over time, cal…
A. \(CaCO_{3}\)
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for each nonmetal below, identify how many covalent bonds (shared elect…
| Element | Number of covalent bonds | | ---- | ---- | | \(H\) | \(1\) | | \(C\) | \(4\) | | \(N\) | \(3\) | | \(O\) | \(2\) | | \(F\) | \(1\) |
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a model of a lithium fluoride (lif) lattice is shown below. a model of …
ionic
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the data below shows the successive ionization energies for unknown ele…
d. silicon
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question 8 how many orbitals are in the fourth electron shell, i.e., wi…
16
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question 1 (1 point) which of the following is a correct description ab…
B. This molecule has a mixture of covalent and ionic bonds
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question 3 (1 point) based on the image below, which of the following i…
a. Hydrogen is giving away two electrons to Carbon
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the alkali metals are found in the first column of the periodic table. …
True
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a period is ..... 1 point 1 2 3 4 5 6 7 0 period h he li be c n o f ne …
A row on the periodic table
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these are examples of... 1 point gold silver platinum iron copper alumi…
metals
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were are the transition metals found on the periodic table? transition …
B. In the center
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these are examples of... sulphur bromine carbon oxygen metalloids nonme…
B. nonmetals
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these are examples of... boron silicon germanium arsenic tellurium anti…
metalloids
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a group of turning is a... 1 2 3 4 5 6 7 0 h li be na mg k ca sc ti v c…
A column on the periodic table
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the noble gases are considered very reactive and need proper storage. 1…
B. False
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the alkaline earth metals all have 2 valence electrons. true false
# Explicación breve: En la tabla periódica, los metales alcalinotérreos se encuentran en el grupo 2. Los elementos de un grupo dado comparten el mismo número de electrones de vale…
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the halogens all have 5 valence electrons halogens on periodic table ha…
False
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the following equation represents the atomic masses of the reactants an…
A molecule with two atoms combined with a molecule with three atoms to produce a molecule with a mass of 84 u.
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mathematical representations quick check sulfur trioxide reacts with wa…
80 amu
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drag the words to complete the sentences. electrostatic attraction shar…
The first blank: electrostatic attraction; The second blank: close together
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periodic table high school reference sheet which statement explains whe…
C. BeO will have a stronger bond because it has a larger ionic charge and a smaller distance between ions.
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mathematical representations quick check how does the formation of wate…
The atomic mass of the reactants equals the atomic mass of the product, and the product has the same number of atoms as the reactants.
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mathematical representations quick check the atomic mass of titanium is…
The mass of one titanium atom is equivalent to the mass of four carbon atoms.
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5 what happens to the energy that is absorbed during an endothermic rea…
A. It is stored in the chemical bonds of the products
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mathematical representations quick check which statement about a chemic…
The reactants and products have the same number of atoms of the same elements.
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this diagram shows the amount of energy stored in the reactants and pro…
C
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select all the element(s) from the periodic table shown that will form …
\(N\) (Nitrogen) and \(P\) (Phosphorus)
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periodic table high school reference sheet an atom x has three electron…
D. \(X^{3+}\)
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question 49 the focus in ______ is on benefitting society, whereas ____…
Question 49: socialism; capitalism Question 50: hunter - gatherers
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multiple choice question chemical potential energy is energy that is du…
bonds
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fill in the blank question energy due to chemical bonds is called
Chemical energy
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fill in the blank question energy due to chemical bonds is called need …
chemical energy
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multiple choice question energy stored by compressing or stretching an …
elastic
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multiple select question select all that apply which are examples of fo…
radiant energy, mechanical energy, electrical energy, chemical energy
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multiple choice question chemical potential energy is energy that is du…
bonds
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multiple choice question which is defined as the energy of motion? o me…
kinetic energy
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fill in the blank question mechanical, electrical, chemical, and radian…
energy
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what are the characteristics of fixed poetry? select three options. a r…
a regular rhyme scheme, lines of equal length, a set number of lines
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read the poem \monets waterlilies\ by robert hayden. today as the news …
- There is no rhyme scheme. - The lines are unequal in length.
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multiple select question select all that apply which are examples of fo…
radiant energy, chemical energy, mechanical energy, electrical energy
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the rhyme pattern that occurs at the ends of lines in poetry is called …
a rhyme scheme.
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4. explain the significance of the bold staircase line on the periodic …
The bold staircase line on the periodic table separates metals from non - metals. Elements to the left are metals, to the right are non - metals, and those touching the line are m…