All mixtures are made up of two or more elements or compounds.
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Answer:
Answer the first ine made up of 2 or more.....
(1) C6H12O6 (3) CaCl2
(2) CH3OH (4) CCl4
A chemical bond forms when atoms react, creating an electrical attraction that results in a molecule. Molecules can be formed from the same or different elements. Chemical reactions involve the forming or breaking of these bonds.
When atoms react, they form a chemical bond. This bond is an electrical attraction, either weak or strong, that holds atoms in proximity to each other. The formation of this bond results in a stable grouping known as a molecule, which can be composed of the same or different elements. An example of this is H2, or molecular hydrogen. When the molecule is formed from different elements, it's called a chemical compound, such as H₂O (water) or CH4 (methane).
Chemical bonds form because it is energetically favorable for atoms to have a full outermost electron shell, creating stability. Atoms can obtain this stable configuration by donating, accepting, or sharing electrons with other atoms. Chemical reactions occur when these bonds are formed or broken, transforming the reactants (starting materials) into products (end results).
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The answer would be:
Pure substance: specifically a compound
Pure substances can be categorized into compounds and elements. A compound is a pure substance that cannot be broken down physically, but it can be broken down through chemical means. It is this property that differentiates it from mixtures. Mixtures can be broken down by physical and/or chemical means.
Elements on the other hand, cannot be broken down at all because it is in its simplest form and is also considered as a pure substance.
Answer:
Pure substance
Explanation:
Matter can be broadly classified into two categories: Pure substances and Mixtures (homogenous and heterogenous mixtures).
The simplest form of a pure substance is an element which cannot be broken down any further. When two or more elements combine, they form a compound which is also a pure substance. Thus, pure substances are systems that are either composed of a single type of element or a single type of molecule.
For example salt (NaCl) is a compound which is composed of elements: sodium (Na) and chlorine (Cl). These elements (in fact ions, Na+ and Cl-) are held together by a chemical bond. Thus, a pure substance like NaCl can be broken down into its elements through chemical means.
The unknown substance in the given question can therefore be classified as a pure substance
Answer:
Explanation:
Sn + 2HBr = SnBr₂ + H₂
Here HBr is an acid but Sn is not a base . It is a metal . So it is not an acid - base reaction .
HCl + KOH = KCl + H₂O
HCl is an acid and KOH is a base so it is an acid base reaction.
2AlCl₃ + 3Ca(OH)₂ = 2Al(OH)₃ + 3CaCl₂
It is an acid base reaction . It is so because aluminium hydroxide is a lewis acid and calcium hydroxide is a base . So it is an acid base reaction .
2C₂H₆ +7O₂ = 4CO₂ + 6H₂O
It is not an acid base reaction . It is actually an example of oxidation reaction in which ethane burns in oxygen to give carbon dioxide and water.
The balanced chemical reaction will be:
2KClO3 = 2KCl + 3O2
We are given the amount of potassium chlorate being burned. This will be our starting point.
400.0 g KClO3 1 mol KClO3/ 122.55 g KClO3) (3 mol O2/2 mol KClO3) ( 32.00 g O2/1mol O2) = 156.67 g O2
Percent yield = actual yield / theoretical yield x 100
Percent yield =115.0 g / 156.67 g x 100
Percent yield = 73.40 %
Answer:
Se + 2e- => Se-2
Explanation:
Ions are electrically charged particles, formed due to the gain or loss of electrons by an atom.
There are two types of ions cations and anions. An element that loses their electrons and forms positive ions are cations while metals and element that gains one or more electrons and forms negative ions are anions.
Selenium is an atom with atomic number 34 and represented as Se. The electronic configuration of Se is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4. Selenium will gain 2 more electrons to complete it p orbital and form an ion Se-2.
The equation is as below:
Se + 2e- => Se-2