Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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which states of matter are described by the kinetic molecular theory? l…
C. All of these
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which box best represents the particles in a gas? a d c b
C.
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how would you best describe the particles in a gas? they have a lot of …
They have a lot of energy and are very spread out.
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which box best represents the particles in a liquid? b all of these c a
A.
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which state of matter has particles that are not packed together, but i…
Gas
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which box best represents the particles in a solid?
B.
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which letter represents a proton?
B
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atoms that gain & lose electrons are called 1 point elements ions isoto…
- Primera pregunta: B. ions - Segunda pregunta: B. negative
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balancing equations 1) h₃po₄ + koh → k₃po₄ + h₂o 2) k + b₂o₃ → k₂o + b …
\(1N_2+3H_2 = 2NH_3\)
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what is the number of protons that the element in this image contain? n…
# Explicación paso a paso: ## Paso 1: Identificar el número atómico El número atómico de un elemento es el número de protones en su núcleo. En la representación del elemento Nitró…
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student.306085@worcesterschools.net switch account * indicates required…
Hydrogen with atomic mass of 1
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what is the mass in grams of a sample of $v_2o_3$ that contains $1.03\t…
\(8.54\times 10^{-11}\text{ g}\)
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chemical models for each reactant and each product are shown below. com…
| Type of atom | Glucose | Oxygen | Carbon dioxide | Water | | --- | --- | --- | --- | --- | | hydrogen (H) | ✓ | | | ✓ | | carbon (C) | ✓ | | ✓ | | | oxygen (O) | ✓ | ✓ | ✓ | ✓ |
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which of the following is a way in which elements and compounds are sim…
Elements and compounds are pure substances.
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contains only one kind of atom. compound mixture element
Element
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how is electron movement related to the bonding in sodium chloride? a t…
C. Electrons exchange creating ions to form an ionic bond by electrostatic attraction.
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which element has 16 neutrons, 15 protons, and 15 electrons? a gallium …
C. Phosphorus
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classify the picture with the correct label. mixture of elements & comp…
Mixture of Elements & Compounds
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which of the following describes the importance of behavioral therapy i…
To address the underlying emotional issues that may drive drug addiction
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classify the picture with the correct label. compound element mixture o…
Mixture of Elements
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classify the picture with the correct label. mixture of elements elemen…
Element
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classify the picture with the correct label.elementmixture of compounds…
Compound
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is sugar (c₁₂h₂₂o₁₁) an element or a compound? element mixture compound
C. Compound
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the image below shows the first two columns of the periodic table.which…
A. K, Cs, Fr
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how many particles are in this diagram? 24 4 10
10
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a chemist made the table below to record some atomic properties of four…
A. Krypton is the least reactive because it has 8 electrons in the outer shell.
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looking at the picture above, which image(s) would be best classified a…
C. B and C
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the formation of lithium fluoride (seen here) is due to a a stronger pu…
B. increased stability in the completion of fluorine’s outer shell.
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if an atom of sodium combines with (captures) an alpha particle that ha…
C. 25 amu
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part a look at the model of a lithium atom. the red and blue subatomic …
A. protons and neutrons; mass number C. sodium
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water (h₂o), is not found on the periodic table because water is a... l…
compound
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the chemical equation shown below represents a reaction that produces f…
\(H_2\)
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what is the atomic number of the atom shown? a 8 b 12 c 18 d 39.948
C. 18
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use the periodic table and observe the element with a mass of 35. if th…
C. The number of protons does not equal the number of neutrons.
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looking at the picture above, which image(s) would be best classified a…
D. A, B, and C
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a certain atom has 20 electrons, 20 neutrons, and 20 protons. what is t…
A. 40
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clear decay, a new isotope is created. how is the nucleus of the new is…
C. The atomic number increases by 1 and the mass remains the same.
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¿el elemento circonio (zr) se clasificarla como cuál de los siguientes?…
metal
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el diagrama muestra un esquema de la tabla periódica. ¿qué clasificació…
halógenos
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what is transpiration? (hint: click the vegetation) what organisms brea…
release of water vapor from the leaves of plants
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seleccione todas las propiedades que describirían las propiedades de lo…
Suave, Malos conductores de calor y electricidad, No brillante, No maleable
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how do carbon dioxide, water, glucose, and oxygen differ? select all th…
All three options (the combination of bonds, the combination of atoms, the arrangement of atoms) are correct.
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¿a qué período y número de grupo pertenece el siguiente elemento? o gru…
Grupo 6A (16) y Período 3
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utilice el diagrama y elija la respuesta correcta para describir qué si…
El número de electrones de valencia
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which types of bonds are in each molecule? complete the table to descri…
| Chemical bonds | Carbon dioxide | Water | Glucose | Oxygen | | --- | --- | --- | --- | --- | | a carbon atom connected to another carbon atom | No | No | Yes | No | | an oxygen …
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electronic, tympanic (aural), chemical - dot, and temporal artery are d…
- Question 6: True - Question 7: False - Question 8: True
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for every 6 molecules of carbon dioxide gas (co₂) and 6 molecules of wa…
| Type of atom | Number of atoms in 1 molecule of glucose | Number of atoms in 6 molecules of oxygen | Total number of atoms in products | |---|---|---|---| | \(H\) | \(12\) | \(0…
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metals tend to lose electrons because they have a high ionization energ…
lose electrons because they have a low ionization energy
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a carbon (c) atom has 6 neutrons, 6 protons, and 6 electrons. what is t…
\(0\)
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the image shows four elements at different locations in a periodic tabl…
Sodium (Na)
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an element, x, is a non - metal and exists in the gaseous phase as a co…
# Explicación breve: - El átomo X es un no metal y tiene 7 electrones de valencia (se ve en el diagrama). - Los elementos con 7 electrones de valencia están en el grupo 17 de la t…
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the periodic table shows the position of four elements from four differ…
Sodium (Na)
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the periodic table organizes the elements into groups and periods. base…
lithium (Li), sodium (Na), potassium (K)
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what is the most electronegative element on the periodic table? helium …
Fluorine
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the metallic character of elements ____ across a period. metals are goo…
decreases; heat
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the periodic law states that: the periodic table arranges elements into…
The properties of elements recur periodically when arranged by increasing atomic number.
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1. which group contains an element which is liquid at stpp a. 1 b. 2 c.…
1. e. 17 2. b. atomic number 3. d. Cs 4. c. Ar 5. a. I
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use the periodic table to answer the following questions. 1. mark watne…
1. Iridium 2. Au 3. Uranium 4. Phosphorus 5. Cesium 6. As 7. Krypton (Kr) 8. Above: Copper (Cu), Below: Gold (Au) 9. 28 10. Cn 11. 2
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clicker question the rate - determining step (r.d.s.) of a reaction mec…
C. The slowest step in the mechanism
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type in the maximum number of electrons that can be present in each she…
\(n = 5\) shell: \(50\) \(n = 2\) shell: \(8\) \(n = 2,l = 0\) subshell: \(2\) \(n = 2,l = 1\) subshell: \(6\) \(3d\) subshell: \(10\) \(2s\) subshell: \(2\) \(5f\) subshell: \(14…
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which is the process by which a solid changes to a liquid? condensation…
melting
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the diagram shows changes of state between solid, liquid, and gas. the …
Q
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brian made this table to organize his notes on changes of state.which c…
deposition
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as atoms gain energy, they move faster and slide past one another more …
liquid to gas
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during which change of state would the volume of a substance increase t…
sublimation
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which change of state is shown in the model? condensation deposition bo…
freezing
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freida wants to model the way atoms move when a substance changes its s…
melting
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during which changes of state does the motion of the atoms decrease? me…
Freezing and condensation.
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clicker question for the hypothetical chemical reaction a + b → c a plo…
A. zeroth
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what does the atomic number represent? a. the atomic mass of the elemen…
d. The number of protons in the nucleus
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what is the atomic mass of sodium (na)? a. 24.31 g/mol b. 18.02 g/mol c…
C. 22.99 g/mol
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how would you calculate the molar mass of carbon dioxide (co₂)? a. by s…
B. By adding the molar mass of Carbon to twice the molar mass of Oxygen
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which statement(s) is/are true for a liquid that has reached its boilin…
B. vapor pressure = atmospheric pressure, D. Bubbles can form.
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what is the relationship between the altitude and the vapor pressure of…
a. The higher the altitude the lower the vapor pressure.
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what is the relationship between the altitude and the vapor pressure of…
D. There is no relationship between altitude and vapor pressure.
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what is the relationship between vapor pressure and boiling point? a th…
B. The higher the vapor pressure the lower the boiling point.
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which statement(s) is/are true for a liquid that is evaporating? select…
B. vapor pressure < atmospheric pressure, C. Bubbles cannot form.
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which statement(s) are true for a liquid that is at its boiling point? …
A. The vapor pressure of the liquid and the atmospheric pressure are equal. B. The molecules all throughout the liquid have enough kinetic energy to enter the gas phase.
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7. calculate the average atomic mass of lithium, which occurs as two is…
\(6.94\)
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with that reflection gortsby rose to go; as he did so an exclamation of…
"Lying on the ground by the side of the bench was a small oval packet"
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determine which change of state is being described in this passage. as …
gas to liquid
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the chemical formula for calcium chloride is a. cacl3 b. cacl c. ca2cl …
A. \(CaCl_{2}\)
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what is the chemical formula for iron (iii) oxide? a. fe₂o₃ b. fe₃o₂ c.…
A. \(Fe_2O_3\)
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oxygen forms an ion with a charge of o a. -3 o b. +2 o c. +3 o d. -2
D. -2
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why has the use of cfcs been phased out? a. they cause acid rain. b. th…
C. They destroy ozone molecules.
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the formula for aluminum hydroxide is a. al₂(oh)₃ b. al(oh)₃ c. al₂o₃ d…
B. \(Al(OH)_3\)
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the correct name for mgf₂ is o a. manganese difluoride o b. monomagnesi…
C. Magnesium Fluoride
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in solid sodium chloride (nacl), there is a ______ ratio of sodium ions…
C. One to One
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ice floats in or on liquid water because: magic is real ice has more hy…
ice has more hydrogen bonds to space out the molecules than liquid water
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a friend asks for input on their artwork. what comments could you give …
The white organic shapes on the edges with their forms sharpening as they extend into the center of the picture.
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which of the following compounds is an ionic compound? a. cao b. nh₃ c.…
A. CaO
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which of the following is an ionic compound? o a co₂ o b. h₂o o c. rbcl…
C. \(RbCl\)
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which pair of elements is most likely to form an ionic compound with ea…
A. magensium and chlorine
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the charge on the iron ion in fecl₂ is o a. +3 o b. -2 o c. +1 o d. +2
D. \( +2 \)
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multiple - choice question since water is polar, it sticks (bonds) to o…
other polar water molecules
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name the ionic compound formed by the ions shown below. a sodium (ii) c…
B. Sodium Chloride
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read it! scientist albert einstein is revered as one of the greatest ph…
D. intersected
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true or false: nonpolar fat molecules cannot dissolve in polar water. t…
true
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question 1 this formula, h₂o contains one metal and one nonmetal two me…
two nonmetals # Question 2
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melting butter is a physical change. which best describes what is happe…
The butter contains a new arrangement of atoms.