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Science
Chemistry
Physical Chemistry
Chemistry: Changes and Properties
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14 Terms
Terms in this set (15)
Chemistry
Study of matter.
Matter
Anything that has mass (made of atoms) and volume (takes up space).
Property
Characteristics, or traits, a specific substance has. Can be chemical or physical.
Physical properties
can be observed and measured without changing the kind of matter being studied. Nothing new is formed!
Physical change
Changing the appearance, not the identity, of a substance.
Chemical properties
Ability of matter to change into something new. You have to try to react the substance in order to determine these properties.
Chemical change
Changing a substance into a new substance. Requires a chemical reaction.
Precipitate
a solid substance that is formed when two liquids are combined chemically.
Luster
Physical property. How shiny a metal is.
Malleability
Physical property. How easy it is to hammer a metal into sheets.
Ductility
Physical property. How easy it is to pull a metal into wires.
Opaque
Physical property. Opposite of transparent (i.e., not see-through).
Sonorous
Physical property. Makes a sound like a bell.
Conductivity
Physical property. How well a metal transfers heat and/or electricity.
Law of Conservation
matter is never be destroyed or created
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Verified questions
physics
You calculated the force on a dipole by "brute force." Here's a more elegant approach. First write $\vec{B}(\vec{r})$ as a Taylor expansion about the center of the loop: $$ \vec{B}(\vec{r})\approx\vec{B}(\vec{r}_0)+[(\vec{r}-\vec{r}_0)\cdot\nabla_0]\vec{B}(\vec{r}_0), $$ where $\vec{r}_0$ is the position of the dipole and $\nabla_0$ denotes differentiation with respect to $\vec{r}_0$. Put this into the Lorentz force law to obtain $$ \vec{F}=I\oint d\vec{l}\times[(\vec{r}\cdot\nabla_0)\vec{B}(\vec{r}_0)]. $$ Or, numbering the Cartesian coordinates from 1 to 3: $$ F_i=I\sum_{j,k,l=1}^3\epsilon_{ijk}\bigg{\{}\oint r_ldl_j\bigg{\}}[\nabla_{0l}B_k(\vec{r}_0)]. $$ where $\epsilon_{ijk}$ is the Levi-Civita symbol (+1 if ijk=123,231 or 312; -1 if ijk=132, 213, or 321; 0 otherwise), in terms of which the cross product can be written $(\vec{A}\times\vec{B})_i=\sum_{j,k=1}^3\epsilon_{ijk}A_jB_k$. Evaluate the integral. Note that $$ \sum_{j=1}^3\epsilon_{ijk}\epsilon_{ljm}=\delta_{il}\delta_{km}-\delta_{im}\delta_{kl}, $$ where $\delta_{ij}$ is the Kronecker delta.
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A pail of water is rotated in a vertical circle of radius 1.00 m. What two external forces act on the water in the pail?
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If the rms value of the electric field in an electromagnetic wave is doubled, by what factor does the average intensity of the wave change?
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Balance this reaction. $$ \ce{CO +H2->CH3OH} $$
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