College Chem Ch 1 ..

Chemistry

Study of atoms and their interactions

what is the scientific method

A procedure for processing and understanding information gathered during experimentation

What is the steps to the scientific method

Observation, research, Hypothesis, Experiment, Conclusion, theory, Natural law

Natural Law

Theory that has been tested and never proven incorrect

what is mass

The amount of space an object occupies.

what is weight

The measure of the pull of Earth on an object.

1mL=

1=cm³

meniscus

All liquids will have a curve when in containers, so measure from the bottom of the curve

uncertainty in measurements?

Markings on equipment only allow for so many decimal places to be read

Accuracy

How close a measurement is to the actual measurement.

precision

How reproducible a measurement is

random error

error that has an equal probability of being high or low

What is a systematic error

same error each time,Mostly because of some repeated error.

What is a Significant figure?

The digits in a measurement that are known with certainty plus the first digit that is uncertain

Why do we use sig figs?

To keep answers from claiming to be more precise than the measurements will allow

What is temperature?

a measure of the average kinetic energy of translation

What is density

the mass per unit volume

D=

m/v

M=

DxV

V=

M/D

What is a homogeneous mixture?

Two or more substances in a mixture that are evenly mixed

What is a heterogeneous Mixture?

Two or more substances in a mixture that visibly has distinguishable parts.

what is Distillation?

uses boiling points of two different substances to separate

What is filtration

separates between a solid and a liquid.

What is a compound?

A substance that is made up of elements, but can still be broken down.

element

Substances that cannot be decomposed into simpler substances

chemical change

A substance becomes a new substance with different properties  and different compositions

What is a physical change?

A change in state of the substance occurs, but the properties and compositions are still the same