Combined science

What is a hypothesis?

A hypothesis is a proposed explanation for a phenomenon, which can be tested through experiments.

What are the three states of matter?

The three states of matter are solids, liquids, and gases.

What is photosynthesis?

Photosynthesis is the process by which green plants convert sunlight into chemical energy using carbon dioxide and water.

What is the main function of the respiratory system?

The main function of the respiratory system is to exchange gases, specifically to take in oxygen and expel carbon dioxide.

What are Newton's three laws of motion?

Newton's three laws of motion describe the relationship between a body and the forces acting on it, including inertia, acceleration, and action-reaction.

What is an ecosystem?

An ecosystem is a community of living organisms interacting with their environment.

What is the pH scale?

The pH scale measures the acidity or alkalinity of a solution, ranging from 0 (acidic) to 14 (alkaline), with 7 being neutral.

What is the atomic number of an element?

The atomic number of an element is the number of protons in the nucleus of its atoms, determining its position in the periodic table.

What are the types of chemical bonds?

The main types of chemical bonds are ionic bonds, covalent bonds, and metallic bonds.

What is the role of DNA in cells?

DNA contains the genetic instructions for the development, functioning, growth, and reproduction of all known living organisms.

What is the law of conservation of mass?

Mass is neither created nor destroyed in a chemical reaction.

What is a renewable resource?

A resource that can be replenished naturally over time.

What is the pH of neutral solutions?

A neutral solution has a pH of 7.

What effect does increasing temperature have on the rate of reaction?

Increasing temperature generally increases the rate of reaction.

What is the difference between mass and weight?

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

What is the purpose of a catalyst?

A catalyst speeds up a chemical reaction without being consumed in the process.

What is osmosis?

Osmosis is the movement of water across a semi-permeable membrane from a dilute solution to a concentrated solution.

What are the basic building blocks of proteins?

Amino acids are the basic building blocks of proteins.

What is a balanced equation?

A balanced equation has the same number of each type of atom on both sides of the equation.

What is the role of chlorophyll in photosynthesis?

Chlorophyll absorbs light energy for photosynthesis.

What is thermal energy?

Thermal energy is the total kinetic energy of particles in a substance.

What is the formula for calculating density?

Density is calculated as mass divided by volume (Density = mass/volume).

What are the main components of a plant cell?

Plant cells consist of a cell wall, cell membrane, chloroplasts, and a central vacuole.

What is the function of red blood cells?

Red blood cells transport oxygen from the lungs to the body and carry carbon dioxide back to the lungs.

What is an example of a physical change?

Melting ice is an example of a physical change.

What does the term 'saturation' refer to in solutions?

Saturation occurs when a solution can no longer dissolve additional solute.

What is a covalent bond?

A covalent bond is formed when two atoms share electrons.

What is an alkali metal?

An alkali metal is an element in Group 1 of the periodic table, which is highly reactive.

What is the main source of energy for the Earth?

The sun is the main source of energy for the Earth.

What type of reaction occurs when an acid and a base combine?

A neutralization reaction occurs when an acid and a base combine.

What is the role of the pancreas in the body?

The pancreas produces insulin and helps regulate blood sugar levels.

What is a fossil fuel?

Fossil fuels are natural substances formed from decayed plants and animals, used as energy sources.

What changes occur during boiling?

During boiling, a liquid changes to gas at its boiling point.

What is a habitat?

A habitat is the natural environment in which an organism lives.

What is natural selection?

Natural selection is the process by which organisms best suited to their environment tend to survive and reproduce.

What is the function of the kidneys?

The kidneys filter waste and excess substances from the blood to form urine.

What is gravity?

Gravity is the force that attracts two bodies toward each other.

What is kinetic energy?

Kinetic energy is the energy possessed by an object due to its motion.

What is a chemical change?

A chemical change results in the formation of one or more new substances.

What is photosynthesis equation in words?

Photosynthesis converts carbon dioxide and water into glucose and oxygen using sunlight.

What is the function of mitochondria?

Mitochondria are the powerhouse of the cell, generating energy through respiration.

What is an organism?

An organism is any living entity that can carry out life processes.

What is an experiment?

An experiment is a procedure carried out to test a hypothesis.

What is biodiversity?

Biodiversity refers to the variety of life in a particular ecosystem or the entire planet.

What is a habitat?

A habitat is the natural environment where an organism lives.

What is a compound?

A compound is a substance formed when two or more elements chemically combine.

What is a virus?

A virus is a microscopic infectious agent that requires a host cell to replicate.

What is the function of platelets?

Platelets are responsible for blood clotting to prevent bleeding.

What is the water cycle?

The water cycle describes the continuous movement of water on, above, and below the surface of the Earth.

What is a galaxy?

A galaxy is a massive system that consists of stars, stellar remnants, interstellar gas, dust, and dark matter.

What is the role of white blood cells?

White blood cells are part of the immune system and help fight infections.

What is matter?

Matter is anything that has mass and occupies space.

What is homeostasis?

Homeostasis is the process by which living organisms maintain a stable internal environment.

What are enzymes?

Enzymes are biological catalysts that speed up chemical reactions in living organisms.

What are greenhouse gases?

Greenhouse gases trap heat in the atmosphere and contribute to global warming.

What is a reaction rate?

Reaction rate is the speed at which reactants are converted into products in a chemical reaction.

What is a hypothesis?

A hypothesis is a proposed explanation that can be tested through experiments.

What is cellular respiration?

Cellular respiration is the process by which cells convert glucose and oxygen into energy.

What is a non-renewable resource?

A non-renewable resource is a resource that cannot be replenished in a short time, such as fossil fuels.

What is the periodic table?

The periodic table is a tabular arrangement of chemical elements organized by atomic number.