WebRheo wants to observe what will happen to substance X (Melting point is at 78c)after heating it on an evaporatìng dish.After heating for a few minutes,substance X starts melting.what is the temperature of substance X? ... 4. what element is this a hydrogen be helium see her shoulder mercury how many electrons are in the iron a2b 78c 82d 123 ... WebMar 21, 2024 · Is helium an element or pure substance or compound? we know that helium is a pure substance although helium atoms are sometimes mixed with their isotopes it is still the same element. since there is no other element combined with helium this makes it an element. What is the difference between a pure substance and a mixture? 1.
Why is helium a pure substance? – MassInitiative
WebJan 23, 2024 · In the visible universe, helium is the second lightest and most plentiful element. Complete answer: Pure substances are substances that have a definite or … WebThis paper presents the results of a comparative analysis of the dielectric strength of disconnecting vacuum interrupters operating on air and helium. The breakdown voltage Ud was measured in the pressure range from 8.0 × 10−4 Pa to 3.0 × 101 Pa for air and from 8.0 × 10−4 Pa to 7.0 × 102 Pa for helium, while varying the interelectrode distance from 1.0 to … pdf free printable teacher appreciation tags
Is helium a pure substance or a mixture? - Quora
WebApr 8, 2024 · It is further classified as metals, nonmetals and metalloids. Characteristics of Elements are as Follows:- It is a pure substance that is homogeneous in nature and is made up of only one kind of element. Such as iron, sulfur, aluminium. Therefore they all are considered as elements. WebOct 4, 2024 · In chemistry, a pure substance has a constant chemical composition. No matter where you sample a substance, it is the same. For chemistry homework, the safest examples of pure substances are … WebAnswer (1 of 13): It is an element. Helium is a noble gas and the most nonreactive one. Helium does not form a compound because its electron shell is completely full. You can make it reactive with high amounts of pressures and by converting it to an ion form, which will eventually form excimers.... pdf free reader download windows 10