Is iron rusting in the presence of moist air a physical change? Rust is a reddish-brown substance formed on iron when it has been exposed to fresh air and moisture for a long time. This process is a chemical change called rusting. What is the chemical reaction of rusting? Rusting is an oxidation reaction. The […]
What are 5 physical contaminants?
What are 5 physical contaminants? Common examples of physical contaminants in food businesses include: hair. fingernails. bandages. jewellery. broken glass, staples. plastic wrap/packaging. dirt from unwashed fruit and vegetables. pests/pest droppings/rodent hair. How quickly can bacterial contamination occur in food? Food poisoning can happen when disease-causing bacteria or other germs, also called ‘pathogens’, spread to […]
What do negative values for net torque mean?
What do negative values for net torque mean? Oh, torque can be positive or negative. Let us say that a positive torque would make a stationary object rotate counter clockwise and a negative torque would make it rotate clockwise. Is a clockwise moment positive or negative? The direction of a moment is opposite to the […]
Que debo hacer para pasar el examen de manejo?
¿Qué debo hacer para pasar el examen de manejo? ¿Cómo aprobar el examen teórico de conducir? Estudia lo más posible en el tiempo correspondiente. Pide consejos a familiares o amigos que lo hayan hecho antes. Asiste a tus clases responsablemente. Realiza algún examen teórico de conducir previamente a tu prueba. Verifica el tiempo que tienes […]
How can we make this object move?
What is the most common way for a virus to kill a cell?
What is the most common way for a virus to kill a cell? Most viral infections eventually result in the death of the host cell. The causes of death include cell lysis, alterations to the cell’s surface membrane and various modes of programmed cell death. Some viruses cause no apparent changes to the infected cell. […]
Is continental or oceanic plates heavier?
Is continental or oceanic plates heavier? Because of their heavy ferromagnesian elements, oceanic plates are much denser than continental plates. The average density of ocean plates is approximately 200 pounds per cubic foot, while continental crust ranges between about 162 and and 172 pounds per cubic foot. What are 3 differences between oceanic and continental […]
Which is the thinnest layer of the earth?
Which is the thinnest layer of the earth? Inner core Which is the thinnest layer of atmosphere? Troposphere What are the 4 atmospheres? The atmosphere is comprised of layers based on temperature. These layers are the troposphere, stratosphere, mesosphere and thermosphere. A further region at about 500 km above the Earth’s surface is called the […]
What would happen if Earth had a tilt of only 5?
What would happen if Earth had a tilt of only 5? An axial tilt of only 5 degrees, however, would mean that seasonal variations would be minimal below about 80 degrees of latitude. Without these seasonal variations, the global climate would be much more uniform, but this would also cause devastation to most of the […]
What are the five factors that affect population?
What are the five factors that affect population? Factors influencing population growth Economic development. Education. Quality of children. Welfare payments/State pensions. Social and cultural factors. Availability of family planning. Female labour market participation. Death rates – Level of medical provision. What factors affect animal population? In the natural world, limiting factors like the availability of […]