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CHM 1025 EXAM 1 (Questions & Answers) Rated 100%

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  • CHM 1025

Celcius, Fahrenheit, and Kelvin temperature scale - ️️Celsius - Boil: 100 - Freeze: 0 Fahrenheit - Boil: 212 -Freeze: 32 Kelvin - Boil: 373 - Freeze: 273 Chemistry - ️️- The study of composition, structure, properties, and reactions of matter - Types: 1. General (definition abov...

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  • November 15, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • CHM 1025
  • CHM 1025
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ACADEMICMATERIALS
CHM 1025 EXAM 1
Celcius, Fahrenheit, and Kelvin temperature scale - ✔️✔️Celsius
- Boil: 100
- Freeze: 0
Fahrenheit
- Boil: 212
-Freeze: 32
Kelvin
- Boil: 373
- Freeze: 273

Chemistry - ✔️✔️- The study of composition, structure, properties, and reactions of
matter
- Types:
1. General (definition above)
2. Organic (study of substances that involve carbon)
3. Biological (study of chemical reactions that take place in biological systems)
4. Physical (physical nature of chemical systems/ energy changes)
5. Geochemistry (chemical composition of ores, soils, and minerals of the surface of
earth and other planets)

Matter - ✔️✔️- All the substances that make up our world
- Anything that occupies space

Chemicals - ✔️✔️Substance that always has the same composition and properties
wherever it is found

Scientific Method - ✔️✔️General principles to a process to understand nature

Observations - ✔️✔️- First steo
- Based on measurements called data
- Describe/ measure an event in nature

Hypothesis - ✔️✔️- Second step
- After data is collected
- States a possible interpretation of the observations
- Must be stated in a way that can be tested by experiments

Experiments - ✔️✔️- Third step
- Tests that determine the validity of the hypothesis

Theory - ✔️✔️- fourth step

, - formed after experiments are repeated by many scientists with consistent results to
confirm the hypothesis - hypothesis could become a theory
- can continue to be tested, modified, and replaced

Metric/ SI Length - ✔️✔️meter (m)/ meter (m)

Metric/ SI Volume - ✔️✔️Liter (L)/ cubic meter (m^3)

Metric/ SI Mass - ✔️✔️Gram (g)/ Kilogram (kg)

Metric/ SI Temperature - ✔️✔️Celsius/ Kelvin

Metric/ SI Time - ✔️✔️Second/ Second


Measured numbers - ✔️✔️numbers you obtain when you measure a quantity using a
measuring tool

Significant figures - ✔️✔️Significant:
- not a zero
- one or more zero between the nonzero digits
- one or more zeros at the end of a decimal number
- in the coefficient of a number written in scientific notation
Not significant:
- at the beginning of a decimal number
- used as a placeholder in a large number without a decimal point

exact numbers - ✔️✔️numbers obtained by counting items or using a definition that
compares two units in the same measuring system

significant figures in calculations - ✔️✔️Multiplication and division with measured
numbers:
- the final answer is written so that it has the same number of sig figs as the
measurement with the fewest sig figs
Addition and subtraction with measured numbers:
- the final answer is written so that it has the same number of decimal places as the
measurement having the fewest decimal places

Metric and SI prefixes - ✔️✔️peta, P, 10^15
tera, T, 10^12
giga, G, 10^9
mega, M, 10^6
kilo, K, 10^3
deci, d, 10^-1
centi, c, 10^-2

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