Category: Physics

Is burning of candle a reversible change? When a candle is burned, chemical reactions take place between the wax and oxygen. These chemical reactions release energy in the form of heat and light. These chemical reactions can’t be reversed back. What ways to change the materials? What are some ways of changing solid materials? Physical […]

What causes hydrogen gas to glow when an electric current is passed through it? Terms in this set (62) What gives gas-filled lights their colors? An electric current passing through the gas in each glass tube makes the gas glow with its own characteristic color. These electrons lose energy by emitting light when they return […]

What is the relationship between the earth and the moon? The Moon is smaller than the Earth and orbits around the Earth in 27.3 days as the Earth revolves around the Sun. The Moon is held in orbit around the Earth by the force of gravity. In turn the Earth and all the other planets […]

Why is cork dead? Mature cork cells are plant cells that form the protective water-resistant tissue in the outer covering of stems or trunks. Cork cells are genetically programmed not to divide, but instead to remain as they are, and are considered dead cells. What is cork cell and their functions? A mature cork cell […]

What does it mean if a girl says Nevermind? “Never mind.” means “I don’t really know how to explain this in a way you’ll understand.” “Nothing.” means “Something, but I’m going to test you to see how you react.” “So, who is she?” means “Okay, I’m trying really hard to not sound jealous, but I’m […]

Is 19 km/h wind strong? 10 to 19 km/h Weather wanes will move, leaves will rustle, and you’ll feel a breeze on your face. Situation normal. 20 to 29 km/h Strong enough to straighten flying flags and shake small tree branches. How much is 70 km in miles per hour? Convert 70 Kilometers per Hour […]

What are the two main functions of cell wall? The main function of the cell wall is to provide structural strength and support, and also provide a semi-permeable surface for molecules to pass in and out of the cell. Where are cell walls found? A cell wall is a fairly rigid layer surrounding a cell […]

How can you speed up an exothermic reaction? Decrease the temperature in Exothermic reactions (Reactions that release energy, or become hot) Add a catalyst (A substance that reduces activation energy, speeding up the reaction) Increase the concentration of reactants. Increase the concentration of catalysts. Why is a match exothermic? – when Energy is released along […]

What is an everyday example of chemical energy? Everyday Chemistry The very wood we burn and the airbags we face every time we enter a vehicle are examples of chemical energy. What is the best definition for chemical energy? The definition of chemical energy is energy released in a chemical reaction or absorbed in the […]

Is it safe to swim to a sandbar? The trough can be a gentle swim, but the sandbars around it can also shift to create the rip currents — channeled rushes of water pulling away from shore — that have caused so many drownings and near drownings over the years. “You are always going to […]