Q1) State whether the following statements are true or false.
The properties of the components of a compound remain unchanged. True False
The correct formula for representing potassium chloride is KCI, True/False
Atoms of different elements have different structure and properties. True/Falso
The symbol for the element cadmium is Cd. True/False
Q2) Answer the following questions in brief.
What are monoatomic molecules?
What are anions and cations?
What are the properties of a mixture?
What information can be obtained from the chemical formula of a compound?
Q3) Answer the following questions in 50 to 70 words.
Differentiate between compounds and mixtures.
Mention the steps involved in writing the formula for magnesium sulphate.
Q5) Define the following.
a. Molecules
b.Atomicity
C. Element
d. Radicals
(NOTE)
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Answers
Answer:
False
True
True
True
A molecule composed of just one atom, and lacking any covalent bonds. The noble gases (He, Ne, Ar, Kr, Xe, and Rn) are all monoatomic,
An anion may be defined as an atom or molecule that is negatively charged. A cation may be defined as an atom or molecule that is positively charged. ... The number of protons is more than the number of electrons in a cation whereas the number of electrons is more than the number of protons in an anion.
Mixtures can be classified on the basis of particle size into three different types: solutions, suspensions, and colloids. The components of a mixture retain their own physical properties. These properties can be used to separate the components by filtering, boiling, or other physical processes.
Difference Between Compound and Mixture
Sl. No. Differentiating Property Compound Mixture
1 Definition Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances.
2 Types Compounds can be of three types, which are: covalent compounds, metallic compounds and ionic compounds.
Note: Compounds can be classified as organic compounds or inorganic compounds depending on the presence of carbon in the molecular structure.
Mixtures are mainly of two types i.e. homogenous mixtures and heterogeneous mixtures.
3 Substance Category Compounds fall under pure substances. Mixtures can be categorized as impure substances.
4 Composition Details The chemical composition of compounds is always fixed. A mixture can have a variable composition of the substances forming it.
5 Nature Compounds are always homogeneous in nature Mixtures can either be homogeneous or heterogeneous in nature.
6 Separation of Constituents The constituents of a compound can only be separated by either chemical or electrochemical methods (like extraction). Mixtures can be separated into their constituents via physical separation methods such as filtration. Thus, the separation of mixtures is relatively easier than the separation of chemical compounds.
7 Properties The properties of compounds are unique to themselves and need not necessarily reflect the properties of the constituent elements. The constituents of a mixture do not lose their properties and so, the properties of a mixture are generally the sum of the properties of its constituents.
8 New Substance A new substance is formed after the constituents are chemically combined. So, a compound has different properties from its constituents. No new substances are formed in mixtures and their properties are dependent on the properties of their respective constituents.
9 Melting and Boiling Points The melting and boiling points of a compound are always defined. The melting and boiling points of a mixture are not defined.
10 Example Water, salt, baking soda, etc. Oil and water, sand and water, smog (smoke + fog), etc.
MgSO4
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Atomicity is defined as the total number of atoms that constitute a molecule. For example, each molecule of oxygen is composed of two oxygen atoms. So atomicity of oxygen is 2.In older contexts, the term atomicity is sometimes used in the same sense as valency.
an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number.
a radical is an atom, molecule, or ion that has an unpaired valence electron. With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most organic radicals have short lifetimes.
Explanation:
Answer:
potassium chloride is a compound true or false