1) Compounds:
a) Chemically combined.
b) Components change properties.
c) Fixed proportions.
2) Mixtures:
a) Physically combined.
b) Components retain properties.
c) Variable proportions.
3) Both:
a) Made of elements.
b) 2 or more components.
A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means. For example water (H₂O) is a chemical compound made of two elements (hydrogen and oxygen).
In chemical change new substances are formed, the atoms are rearranged and the reaction is followed by an energy change.
There are no chemical bonds between substances in the mixture.,For example, mixture is solution of water and alcohol.
Nuclear power plants real ease energy by FISSION
(this is the process when a heavy, unstable atomic nucleus splits into 2 or more lighter elements. This process releases lots of energy.)
I hope this helped you out! :)
<span>a. What is the empirical formula of the gas? In this case, the empirical formula is the same as the molecular formula
</span>
An empirical formula is a formula that gives the proportions of the elements present in a certain compound however it does not give the actual numbers or the arrangement of the atoms. To determine this, we do as follows:
H = (1.69)(.05) = 0.08 g ( 1 mol / 1.01 g ) = 0.0792 / 0.0792 = 1
F = (1.69)(.95) = 1.61 g ( 1 mol / 19 g ) = 0.0847 / 0.0792 = 1
The empirical formula would be HF.
<span>b. What is the molecular formula of the solid?
I bet there is a lacking information for the solid. We cannot determine the molecular formula with only the values given above. The closest would be the compound UF2O2.
</span><span>c. Write a balanced equation for the reaction between UF6 and H2O.
</span>2H2O + UF6 -> UF2O2 +4HF
Answer:
combination, decomposition, displacement, combustion, and disproportionation
Answer:
See below ~
Explanation:
The respective pairs are :
× Ribose ⇒ The sugar of RNA
× Double helix ⇒ Structures of DNA
× Watson & Crick ⇒ Proposed the double helix model
× Base pair ⇒ Adenine - Thymine pair
× Cytosine ⇒ The nucleotide pair of Guanine