Year: 2018

What are 4 chemical properties of oxygen? Oxygen is a colorless, odorless, tasteless gas. It changes from a gas to a liquid at a temperature of -182.96°C (-297.33°F). The liquid formed has a slightly bluish color to it. Liquid oxygen can then be solidified or frozen at a temperature of -218.4°C (-361.2°F). What are 5 […]

How do you heat up gold? Try using a propane torch to melt gold. The gold should be placed into a crucible. Be careful to bring the torch down slowly if you have fine powdered gold in the crucible because you could easily blow it around. With a torch, hold the flame well above the […]

Why do we see sun before sunrise? The rising sun is visible to us before actual sun rise and after actual sunset because of the atmospheric refraction of light. The rays from the sun coming through space enter from rarer to the denser medium and hence bend slightly towards normal at each refraction and become […]

What is the difference between speed and power in PE? Power is the ability to exert as much force as possible in the shortest amount of time. To put it simply, speed + strength = power. When it comes to power, you won’t be able to lift as much weight as you would if you […]

Which type of lever is scissors? Other examples of first class levers are pliers, scissors, a crow bar, a claw hammer, a see-saw and a weighing balance. In summary, in a first class lever the effort (force) moves over a large distance to move the load a smaller distance, and the fulcrum is between the […]

What are the six different types of chemical reactions? Six common types of chemical reactions are: synthesis, decomposition, single-displacement, double-displacement, combustion and acid-base reactions. Scientists classify them based on what happens when going from reactants to products. Can a synthesis reaction have 3 reactants? 1 Answer. The production of group 1 and group 2 hydrogen […]

What is the importance of formulating a hypothesis? A hypothesis enables researchers not only to discover a relationship between variables, but also to predict a relationship based on theoretical guidelines and/or empirical evidence. Developing a hypothesis requires a comprehensive understanding of the research topic and an exhaustive review of previous literature. What is a broader […]

Is distance a scalar or vector? Distance is a scalar quantity that refers to “how much ground an object has covered” during its motion. Displacement is a vector quantity that refers to “how far out of place an object is”; it is the object’s overall change in position. Why distance is called a scalar quantity? […]

What has 18 protons and 22 neutrons? Name Argon What has 9 protons and 9 Neutrons? Fluorine How many electrons are in fluorine 21? So… for the element of FLUORINE, you already know that the atomic number tells you the number of electrons. That means there are 9 electrons in a fluorine atom. How many […]

What has an atomic number of 36? The Elements, sorted by Atomic Number Atomic Number Symbol Name 35 Br Bromine 36 Kr Krypton 37 Rb Rubidium 38 Sr Strontium Is krypton a real element? Krypton (Kr), chemical element, a rare gas of Group 18 (noble gases) of the periodic table, which forms relatively few chemical […]