A. Fill in the blanks.
1. ____________ are the basic building blocks of all matter.
2. An atom is electrically __________________ as it has equal number of protons and electrons.
3. ______________ revolves around the nucleus in a circular orbit.
4. An __________________ is made up of only one type atoms.
5. Two or more elements combined to form a ________________.
6. Constituents of a _______________can be separated physically.
B. State whether the following statements are true or false.
1. The properties of a compound are entirely different from those of its constituents. _________
2. Carbon dioxide and water are mixtures. _________
3.Theconstituentsofacompoundcombineinfixedratio._________
4. An atom is the smallest unit of any element. _________
5. All matter has mass and occupies space. _________
6. Gold and silver are not elements. _________
C. Match the following:
1. Sodium Chloride a. Molecule
2. Air b. Negatively charged
3. Gold c. Compound
4. Nitrogen d. Element
5. Electron e. Mixture
D. Answer the following questions.
1. What is a compound made up of?
_________________________________________________________________________________
2. Why an atom is electrically neutral?
_________________________________________________________________________________
3. Classify the following into compound, elements or mixture? Gold, Water, Salt, Copper, Air, Soil, Honey
_________________________________________________________________________________
Answers
Answer:
Explanation:
A.
1. Atoms
2. Nuetral
3. Eletrons
4. Element
5. Compounds
6. Mixture
B.
1. True
2. False
3.True
4. True
5. True
6. False
C.
1. Sodium ------> Compund
2. Air ----------> Mixture
3. Gold --------> Element
4 . Nitrogen ----------> Molecule
5. Electrons ---------> Negatively Charged
D.
1. A compound consists of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule. So, any molecule that consists two or more different elements is a compound. A molecule contains two or more atoms joined chemically.
2. Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion.
3. Gold = Element
Water = Compound
Salt = Compound
Air = Mixture
Copper = Element
Soil = Mixture
Honey = Mixture
Answer:
Atoms are not the buliding blocks of matter
Select one:
True
False