Recent questions tagged science

Description : What is the difference between a physical and a chemical property?

Last Answer : Answer: A physical property is a characteristic of a substance that can be observed or measured without changing the chemical composition of the substance, while a chemical property is a ... properties. For example, density is a physical property, while flammability is a chemical property.

Description : What is the difference between a virus and a bacteria?

Last Answer : Answer: Bacteria are single-celled microorganisms that can live and reproduce independently, while viruses are non-living particles that require a host cell to replicate. Bacteria can be beneficial or ... viruses are generally harmful and can cause diseases such as influenza, HIV, and COVID-19.

Description : What is the law of conservation of energy?

Last Answer : Answer: The law of conservation of energy states that energy cannot be created or destroyed, but can only be transformed from one form to another. In other words, the total energy of a closed ... even though energy may be transferred from one object to another or converted from one form to another.

Description : What is the difference between mass and weight?

Last Answer : Answer: Mass is a measure of the amount of matter in an object, while weight is a measure of the gravitational force acting on an object. Mass is measured in kilograms, while weight is measured in newtons.

Description : What is the difference between an element and a molecule?

Last Answer : Answer: An element is a substance made up of only one type of atom, while a molecule is a combination of two or more atoms that are chemically bonded together. For example, oxygen is an element made up of only oxygen atoms, while water is a molecule made up of two hydrogen atoms and one oxygen atom.

Description : What is a gene?

Last Answer : Answer: A gene is a sequence of DNA that encodes information for the synthesis of a specific protein or functional RNA molecule. Genes are the basic units of heredity and determine an organism's ... and characteristics. The human genome is estimated to contain approximately 20,000 to 25,000 genes.

Description : What is the difference between a compound and a mixture?

Last Answer : Answer: A compound is a substance composed of two or more different elements chemically combined in a fixed proportion, while a mixture is a combination of two or more substances that are not chemically ... , while a mixture of salt and sand can be separated by physical means such as filtration.

Description : What is a chemical reaction?

Last Answer : Answer: A chemical reaction is a process in which one or more substances are transformed into one or more new substances with different chemical properties. Chemical reactions involve the breaking and ... and can be classified into different types based on the nature of the reactants and products.

Description : What is the difference between potential energy and kinetic energy?

Last Answer : Answer: Potential energy is the energy that an object possesses due to its position or state, while kinetic energy is the energy that an object possesses due to its motion. For example, a ball sitting ... relative to the ground, while a ball rolling down a hill has kinetic energy due to its motion.

Description : What is the difference between an acid and a base?

Last Answer : Answer: An acid is a substance that donates hydrogen ions (H+) in a solution, while a base is a substance that accepts hydrogen ions or donates hydroxide ions (OH-) in a solution. Acids are typically sour in taste, while bases are typically bitter in taste and feel slippery to the touch.

Description : How does photosynthesis work?

Last Answer : Answer: Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy, which is stored in the form of glucose and other organic molecules. ... drive a series of chemical reactions that convert carbon dioxide and water into glucose and oxygen.

Description : What is the difference between speed and velocity?

Last Answer : Answer: Speed is a scalar quantity that refers to the rate at which an object is moving, while velocity is a vector quantity that refers to the rate at which an object is moving in a particular direction ... a speed of 60 mph, but its velocity will depend on the direction in which it is traveling.

Description : What is a black hole?

Last Answer : Answer: A black hole is an object in space that has such a strong gravitational pull that nothing, not even light, can escape from it. Black holes form when massive stars collapse in on ... the naked eye, but their presence can be detected through their effects on nearby matter and radiation.

Description : What is the periodic table of elements?

Last Answer : Answer: The periodic table of elements is a chart that arranges all known chemical elements in order of increasing atomic number, based on their electron configurations and chemical properties. ... as it allows scientists to predict the properties and behavior of different elements and compounds.

Description : What is the difference between a chemical change and a physical change?

Last Answer : Answer: A chemical change is a process that results in the formation of one or more new substances with different chemical properties, while a physical change is a process that changes the physical ... it changes the state of the water from solid to liquid without changing its chemical composition.

Description : How does the immune system work?

Last Answer : Answer: The immune system is the body's defense against disease-causing pathogens like viruses and bacteria. It is made up of specialized cells and tissues that work together to identify, attack, and ... T cells and B cells, and the release of inflammatory chemicals to help fight off the infection.

Description : What is the difference between renewable and non-renewable energy sources?

Last Answer : Answer: Renewable energy sources are those that can be replenished naturally over a relatively short period of time, such as solar, wind, hydro, and geothermal power. Non-renewable energy sources, on ... naturally on a human timescale, such as fossil fuels like coal, oil, and natural gas.

Description : What is the difference between a solid, a liquid, and a gas?

Last Answer : Answer: Solids have a fixed shape and volume, while liquids have a fixed volume but take the shape of their container, and gases have neither a fixed shape nor volume and take the shape and ... of matter are determined by the strength of the forces between the particles that make up a substance.

Description : What is the difference between kinetic and potential energy?

Last Answer : Answer: Kinetic energy is the energy of motion, while potential energy is the energy that an object possesses due to its position or state. For example, a moving car has kinetic energy, while a ball sitting on a table has potential energy due to its position above the ground.

Description : What is the greenhouse effect?

Last Answer : Answer: The greenhouse effect is the process by which greenhouse gases (such as carbon dioxide, methane, and water vapor) trap heat in the Earth's atmosphere, causing the planet's temperature to rise. Without the greenhouse effect, the Earth would be too cold to support life as we know it.

Description : What is the difference between mitosis and meiosis?

Last Answer : Answer: Mitosis and meiosis are two types of cell division. Mitosis is the process by which a single cell divides into two identical daughter cells, each with the same number of chromosomes as ... cell division that is involved in the production of gametes (sperm and eggs) for sexual reproduction.

Description : How do earthquakes occur?

Last Answer : Answer: Earthquakes are caused by the sudden release of energy that has been stored in rocks beneath the Earth's surface. This energy is released as seismic waves that cause the ground ... factors, including plate tectonics, volcanic activity, and human-induced activities such as drilling or mining.

Description : What is the difference between a solvent and a solute?

Last Answer : Answer: A solvent is a substance that dissolves another substance, called a solute, to form a homogeneous mixture. The solvent is typically present in the greater amount, while the solute is present in the ... in a solution of sugar dissolved in water, water is the solvent and sugar is the solute.

Description : How does photosynthesis work?

Last Answer : Answer: Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. During photosynthesis, the chlorophyll in plant ... released into the atmosphere, while the hydrogen is combined with carbon dioxide to form glucose.

Description : What is the difference between weather and climate?

Last Answer : Answer: Weather refers to the short-term atmospheric conditions in a particular area, such as temperature, precipitation, and wind. Climate, on the other hand, refers to the long-term patterns of weather in a particular region or on a global scale.

Description : What is the name of the process where a liquid or gas flows around a solid object, creating a force called drag?

Last Answer : A: Fluid dynamics.

Description : What is the name of the process where a substance dissolves in a liquid to form a solution?

Last Answer : A: Dissolution.

Description : What is the name of the process where a liquid passes through a semipermeable membrane to separate it from other substances?

Last Answer : A: Filtration.

Description : What is the name of the process where two or more atoms combine to form a new substance?

Last Answer : A: Chemical bonding.

Description : What is the name of the process where a solid turns into a liquid and then back into a solid?

Last Answer : A: Melting and freezing.

Description : What is the name of the process where a gas turns into a liquid and then back into a gas?

Last Answer : A: Condensation and evaporation.

Description : What is the name of the process where a liquid turns into a solid and then back into a liquid?

Last Answer : A: Freezing and melting.

Description : What is the name of the process where a solid turns into a gas and then back into a solid?

Last Answer : A: Sublimation.

Description : What is the name of the process where a liquid turns into a gas and then back into a liquid?

Last Answer : A: The water cycle.

Description : What is the name of the process where a gas turns into a liquid?

Last Answer : A: Condensation.

Description : What is the name of the process where a gas turns into a solid?

Last Answer : A: Deposition.

Description : What is the name of the process where a liquid turns into a solid?

Last Answer : A: Freezing.

Description : What is the name of the process where a solid turns into a liquid?

Last Answer : A: Melting.

Description : What is the process of using electricity to separate water into hydrogen and oxygen called?

Last Answer : A: Electrolysis.

Description : What is the process of a gas turning into a liquid called?

Last Answer : A: Condensation.

Description : What is the name of the process where a liquid turns into a gas?

Last Answer : A: Evaporation.

Description : What is the process of a solid turning directly into a gas called?

Last Answer : A: Sublimation.

Description : What is the name of the layer of the Earth's atmosphere that contains the ozone layer?

Last Answer : A: The stratosphere.

Description : What is the difference between a virus and a bacterium?

Last Answer : A: A virus is smaller and can only reproduce inside a living host, while a bacterium can reproduce on its own.

Description : What is the process of blood flowing through the heart called?

Last Answer : A: Circulation.

Description : What is the name of the process where plants release water vapor through their leaves?

Last Answer : A: Transpiration.

Description : What is the process of using sunlight to create energy called?

Last Answer : A: Photosynthesis.

Description : What is the largest organ in the human body?

Last Answer : A: The skin.

Description : What is the difference between a physical change and a chemical change?

Last Answer : A: A physical change involves a change in physical appearance, while a chemical change involves a change in chemical composition.

Description : What is the function of the mitochondria in a cell?

Last Answer : A: To produce energy.