Water

Today we learned about Water that the part of the Earth is most important. H2O known as Water which consisting 3 atoms. Oxygen creates partial negative charges and hydrogen creates partial positive charge. Surface tension is the inward force, or pull, that tends to minimize the surface area of a liquid. All liquids have have a surface tension, but water’s surface tension is higher than most. Molar mass of water is 18.0 g/mol, but it has a boiling point of 100 degrees Celsius. Hydrogen bonding gives high surface tension, low vapor pressure and high boiling point.

Dalton’s Law of Patial Pressure

Today I learned about Dalton’s Law is gas pressure from collisions of particles in a gas with an object. The contribution each gas in a mixture makes to the total pressure is called the partial pressure exerted by that gas. In a mixture of gases, the total pressure is the sum of the partial pressures of the gases. Dalton’s law holds true because each component gas exerts its own pressure independent of the pressure exerted by the other gases.

Today we learned chapter 13. Gases are easily compressed, or squeezed into a smaller volume. Compressibility is a measure of how much the volume of matter decreases under pressure. Gases are easily compressed because of the space between the particles in a gas.

Today we learned chapter 13 about States Of Matter. Find properties and asumptions of kinetic energy: Gases are composed of tiny particles, hard spheres. Insignificant volume is comparison to container and distances between particles in liquid or solid. Motion in gas is rapid, constant and random and straight line, colliding with each other to another particles, like the container. All  collisions in gas are elastic: no attraction and repulsi, transferred without loss. Temperature and kinetic energy are proportion: Temperature increase kinetic energy decrease. Temperature decrease kinetic energy increase.

Significant Figures

Today I learned about significant figures. Significant figures are digits in scientific notation. For adding and subtracting rules:

+ Looking at decimal point.

+ Final answer needs only 1 significant figures.

Multiplying and dividing rules are always round at the end, only the final answer.

Leading zeros are not significant figures, and trailing zeros without a decimal are not significant figures.

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