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## How do the water molecules closest to the burner compare to the water molecules closest to the surface of the liquid?

How do the water molecules closest to the burner compare to the water molecules closest to the surface of the liquid? They are closer together and moving slower than those at the surface. They are more spread out and moving faster than those at the surface. The diagram shows the sun’s interior.

## Where convection currents form check all that apply?

Convection currents may occur in the atmosphere where warm air rises while cold denser air sinks or moves towards the bottom, it may also occur in the mantle of the Earth and water or water bodies such as lakes.

## Which condition must exist in order for conduction to occur between two substances the molecules of the substances must be touching both substances must be the same temperature at least one substance must be a liquid most of the molecules must be slow moving?

The law of conservation of energy states that energy cannot be or destroyed. Which condition must exist in order for conduction to occur between two substances? The molecules of the substances must be touching. Both substances must be the same temperature.

## What happens to molecules when cooled?

If water is cooled enough it can change to ice. If ice is warmed enough, it can change to liquid water. Heating a substance makes the molecules move faster. Cooling a substance makes the molecules move slower.

## Does molecules move faster in hot or cold water?

Heat is a form of energy. The heat energy from the water makes the water molecules in the hot water move faster than the water molecules in the cold water.

## Why do molecules move faster in heat?

All three states of matter (solid, liquid and gas) expand when heated. The atoms themselves do not expand, but the volume they take up does. Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

## What happens to molecules in hot water?

When you heat up water, the water molecules start moving around faster and faster. They bounce off each other and move farther apart. Because there’s more space between the molecules, a volume of hot water has fewer molecules in it and weighs a little bit less than the same volume of cold water.

Solids

## Why do lighter gas molecules move faster?

increases as the molar mass decreases and as temperature increases (Figures 5.18-19). Summary of Kinetic Molecular Theory: All gases have the same average kinetic energy at the same temperature (but KE increases as T increases). So lighter molecules diffuse and effuse faster than heavier molecules.

## Do heavier molecules diffuse faster?

Mass of the molecules diffusing: Heavier molecules move more slowly; therefore, they diffuse more slowly. The reverse is true for lighter molecules. Temperature: Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion.

Nitrogen

## What is the highest kinetic energy?

Solid particles have the least amount of energy, and gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles.

## Do all gases have same kinetic energy?

Gases consist of particles (molecules or atoms) that are in constant random motion. The average kinetic energy of gas particles is proportional to the absolute temperature of the gas, and all gases at the same temperature have the same average kinetic energy.

## Which is faster oxygen or hydrogen?

The average velocity of hydrogen molecules is 4 times greater than that of oxygen molecules.

## Why does co2 diffuse faster than O2?

When gases are diffusing through liquids, for example across the alveolar membrane and into capillary blood, the solubility of the gases is important. The more soluble a gas is, the faster it will diffuse. Carbon dioxide is inherently more soluble than oxygen, and thus diffuses much faster than oxygen into liquid.

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## What is the rate of oxygen?

The normal flow rate of oxygen is usually six to 10 litres per minute and provides a concentration of oxygen between 40-60%. This is why they are often referred to as MC (medium concentration) masks, as 40%-60% is considered to be a medium concentration of oxygen.

## What is the diffusion rate of oxygen?

The O2 diffusion coefficient in saturated air (15% oxygen) is 5,700 to 10,800 times greater than in water (60°C and 20°C respectively)….Tom Richard.

Temperature Viscosity of H2O [centipoises] (Weast, 1969) O2 Diffusion Coefficient [cm2/s]
50°C 0.547 0.0000399
60°C 0.467 0.0000482

## What is Graham’s law of diffusion?

Graham Law. The rate of effusion of a gaseous substance is inversely proportional to the square root of its molar mass. Graham’s law is an empirical relationship that states that the ratio of the rates of diffusion or effusion of two gases is the square root of the inverse ratio of their molar masses.

2021-05-16