Matter And Energy 1 Hw 3 Flashcards
How would you convert 35.2 h to seconds?
I would do 35.2h * 60min/1h * 60s/1min
=126,720 seconds
If Ethylene glycol has a density of 1.11 g/mL. Determine the mass of it (in grams) of 417 mL of this liquid.
Given: 417 mL
Find: ?g
Solution: ?g=417mL * 1.11g/1mL=463 g
Solid
Is an ordered arrangement, particles are close together, and particles are in fixed position.
Liquid
Is in disorder, particles are close together, and particles are free to move.
Gas
In total disorder, particles have much empty space, and particles have freedom of motion.
What is a pure substance?
Is made of a single chemical substance (element or compound) and cannot be separated by physical methods.
What is a mixture?
Consists of two or more substances that can be separated by physical means.
Distilled water is a — and sea water is a —-.
Pure substance, mixture.
Homogeneous mixture
A mixture that is uniform in appearance and composition. Ex. Sea water or orange juice.
Heterogeneous mixture
A mixture that is not uniform and separate into layers or phases. Ex. Oil+water or noodle soup.
Physical properties
Characteristics that can be observed or measured without altering the identity of the substance. Ie color, order, taste, appearance, melting point, boiling point m, or density.
Physical changes
Changes that alter the physical form, but not the chemical identity. I.e ice melting.
Chemical properties
The behavior of a substance and all the changes possible for it. I.e reactivity, toxicity, acidity, flammable, corrosiveness.
Chemical changes
Changes that destroy the identity of a substance, forming something new. Also called a chemical reaction.
Chemical ELEMENTS
-substances made of of a single type of atom
-cannot be decomposed into other pure substance by ordinary chemical means
Ex. Carbon, iron, gold, silver
