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Chem Study Stack
Chem test
Question | Answer |
---|---|
What are the steps of the scientific method | 1.) define the problem 2.) write a hypothesis 3.) experiment 4.) collect data 5.) analyze data |
2 words that appear in a hypothesis | 1.) if 2.) then |
role of the control group | 1.) does not get the tested variable (independent variable) 2.) comparison to experiment 3.) validate results |
control vs. experimental | Control 1.) does not get the tested variable Experimental 1.) does get the tested variable |
3 states of matter | Liquid 1.) no distinct shape 2.) has volume Solid 1.) has shape 2.) has volume Gas 1.) no shape 2.) no volume |
Levels of matter (in order) | Atoms 1.) sodium Element 1.) sodium Compound/mixture 1.) compound - Ionic (sugar) 2.) mixture - Covalent ( water) Mixture 1.) solution, suspension, colloid |
physical vs. chemical | Physical 1.) changes the appearance a.) liquid Chemical 1.) changes the identity a.) chemical reaction |
3 types of mixture | Solution 1.) homogeneous a.) acid/base Suspension 1.) Heterogeneous (full dissolving) a.) cool aid Colloid 1.) Heterogeneous (partial dissolving) a.) jello |
law of conservation | Products = Reactants in mass |
accuracy and precision | Good accuracy 1.) 10, 10, 10.1 a.) you want 10 Bad accuracy 1.) 14, 17, 20 a.) you want 13 Bad accuracy, Good precision 1.) 12, 12.1, 11.9 a.) you want 15 |
Certainty vs. Uncertainty | Certainty 1.) a place is known (not rounding) Uncertainty 1.) a place is unknown (rounding) |
SI Units | Mass - kilograms Volume - liter Amount - Mole Heat - Joules Temp - kelvin Length - meters |
Heat vs. Temperature | Heat a.) Joules and Calories b.) total kinetic energy Both a.) measure in kinetic energy Temperature a.) Celsius, farenheight, kelvin b.) average kinetic energy |
Absolute Zero | everything stops |
calories | amount of heat energy released if all the bonds are broken |
density increase and decrease | increase density a.) increase mass, decrease volume decrease density a.) decrease mass, increase density |
calories - joules | x calories by 4.184 |
Celsius - kelvin | + 273 to celcius |
labels for solid, liquid, gas | solid a.) cm^3 liquid a.) mL gas a.) L |