<span>a) Table salt: it is a compound. A compound is a combination of atoms in fixed proportions.Table salt is NaCl, which means that table salt is a compound of 1 atom of Na and 1 atom of Cl and not other thing. b) Blood: is an homogeneous mixture: it is a mixture of many compounds which can not be easily distinguished or separated, you need microscopes or very special physical methods to distinguish or separate the different compounds of blood. d) Steel: it is a special king of homogeneous mixture (it is called an alloy) which, as in the case of blood, cannot be distinguished or separated easily. d) Planet earth: it is a heterogeneous mixture. You can easily distinguish many of the compounds of the planet Earth: water, oxygen, carbon,...</span><span />
Answer:
The frequency of photon is 0.75×10¹⁵ s⁻¹.
Explanation:
Given data:
Energy of photon = 5×10⁻¹⁹ J
Frequency of photon = ?
Solution:
Formula;
E = hf
h = planck's constant = 6.63×10⁻³⁴ Js
5×10⁻¹⁹ J = 6.63×10⁻³⁴ Js ×f
f = 5×10⁻¹⁹ J / 6.63×10⁻³⁴ Js
f = 0.75×10¹⁵ s⁻¹
The frequency of photon is 0.75×10¹⁵ s⁻¹.
<h2>Definition:</h2>
Chemistry is the study of matter, it's properties, how and why substances combine or separate to form other substances, and how substances interact with energy. Chemistry is one of the physical sciences that help us to describe our world.
<h2>sentence examples:</h2>
•chemistry is a little hard.
•chemistry is fun to do!
<h2>synonyms:</h2>
•system
•organizing
•structure
•plan
•standard
•assembly
•design
•formation
•pattern
•method
•construction
<h2>antonyms:</h2>
•imbalance
•disproportion
•disorganizing
<h2>Origin:</h2>
Chemistry comes from Arabic word al-Kimia which means the art of transformation. Chemistry began as the study of alchemy.
Food that contains nuts should be prepared last
Answer:
the energy store in an object is called potential energy
the unit of measure is called a joule
Explanation:
potential is what they can do and a joule is they're potential in measurement.
