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TX PACT 4-8 CORE (790) questions with correct answers, 197 Q&A, 2024. With Complete Solution. $14.49
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TX PACT 4-8 CORE (790) questions with correct answers, 197 Q&A, 2024. With Complete Solution.
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TX PACT 4-8 CORE (790) questions with correct answers, 197 Q&A, 2024. With Complete Solution. How many SFs in 0.? 8 SFs: Addition and Subtraction Rules answer has the same # decimal places as numeral w/the smallest # of decimal places. EX: 1063.02 + 12.5 = 1075.5 SFs: Multiplication/Divisio...

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  • March 21, 2024
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  • 2023/2024
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TX PACT 4-8 CORE (790) questions with correct answers,
197 Q&A, 2024. With Complete Solution.

How many SFs in 0.010025600?

8

SFs: Addition and Subtraction Rules

answer has the same # decimal places as numeral w/the smallest # of decimal places.
EX: 1063.02 + 12.5 = 1075.5

SFs: Multiplication/Division Rules

answer has the same # of SFs as numeral with smallest # of SFs.
EX: 1063.02 x 12.5 = 13287.75 => 1.33 x 10^4

Define: Hypothesis, Theory, and Scientific Law

Hypothesis: testable prediction based on observations (educated guess)
Theory: proposed explanation, based on evidence, that may or may not be testable. (educated
explanation on why something happens)
Scientific Law: proven and documented description of observations surrounding phenomena (states
what will happen not why)

*theories do not become laws

independent variable

The experimental factor that is manipulated by the scientist; the variable whose effect is being studied.
(usually on x-axis)

dependent variable

The measurable factor; the variable that may change in response to (or depend on) manipulations of the
independent variable.

Precision

a measure of how close a series of measurements are to one another

Accuracy

how close a measurement is to the true value

Negative feedback

A type of regulation that responds to a change in conditions by initiating responses that will counteract
the change or correct the system back to original state. Maintains a steady state (homeostasis).
EX: body temperature

,Positive feedback

A type of regulation that responds to a change in conditions by initiating responses that will amplify the
change. Takes organism away from a steady state.
EX: Global warming or contractions

Matter

Anything that has mass and takes up space (made up of atoms)

Ground state of atoms

lowest energy, most stable electron configuration

Neutrons

neutral charge; mass # - atomic # (protons)

Quantum Model

current atomic model in which e- move in waves around nucleus (w/ uncertain positions in an e- cloud)

Molecules vs. Compounds

Molecules: Groups of two or more atoms held together by chemical bonds
Ex: O2 & consist of compounds too
Compounds: 2 or more DIFF. elements held by ionic or molecular bonds
Ex: H2O, NaCl, etc..

Isotopes

atoms w/ same # of protons, but diff. # of neutrons

Radioactivity

The spontaneous nuclear emission of radiation by an unstable atomic nucleus, which changes # of
protons (identity of element)

Alpha Decay

Radioactive decay in which an atom emits an alpha particle (w/ 2P and 2N). This decreases the atomic #
by 2 and the mass number by 4.

emission of helium-4 nucleus

Beta Decay

radioactive decay in which neutron changes into proton by emitting an e- and neutrino. This increases
atomic # by 1 and mass stays the same.

emission of an electron or a positron

Gamma Decay

, radioactive decay by emission of a gamma ray; atomic # and mass # do not change.

carbon dating

uses half life to approximate age of fossils.

solute

the substance that is dissolved in solvent

"pUT the solUTe in the solvent"

density

mass/volume

Kinetic Molecular Theory of Matter

all matter is constantly in motion
- KE and speed increases as temp. increases

Wind turbine energy transformation

kinetic (wind moves motor) to mechanical (generator)

strongest to weakest bonds

covalent, ionic, hydrogen

types of bonds

- covalent: e- are shared b/t 2 atoms (usually NM)
- ionic: oppositely charged ion attraction - one atom loses e-, other accepts [one M (+), one NM (-)]
- metallic: 2 metal atoms
- hydrogen: weak bonds, easily breakable

states of matter

solid: rigid, fixed shape & volume
liquid: fixed volume
gas: compressible

during a phase change, temp. is constant until change is complete and matter is conserved

Combination Rxn

A+B-->AB

Decomposition Rxn

AB --> A + B

Single Replacement Rxn

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