Gr7 March science exam

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Gr7 March science exam T.Safaa

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Safaa Samy

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Gr7 March science exam


Gr7 March science examVersión en línea Gr7 March science exam T.Safaa por Safaa Samy 1 What is meant by the Atomic Group a An ion composed of more than one atom of more than one element b A mixture composed of the melts of two or more metals. c the attraction force between the positive metal ions and negative valence electron which surround them. 2 Write the chemical formula of Hydrosulphuric acid. a H₂S b NaOH c NH₄Cl 3 Write the chemical formula of Hydrosulphuric acid. a H₂S b NaOH c NH₄Cl 4 Write the chemical formula of Sodium hydroxide. a LiOH b NaOH c K₃PO₄ 5 Write the chemical formula of Sodium hydroxide. a LiOH b NaOH c K₃PO₄ 6 Write the chemical formula of Lithium hydroxide a li oh b Li H c LiOH 7 Write the chemical formula and the name for NH4+, Cl- a Ammonium chloride (NH₄Cl) b Ammonium chloride (NH₄Cl₂) c K₃PO₄ 8 Write the chemical formula and the name for NH4+, Cl- a Ammonium chloride (NH₄Cl) b Ammonium chloride (NH₄Cl₂) c K₃PO₄ 9 Write the chemical formula and the name for K⁺ , PO₄³⁻ a Potassium phosphate (K₃PO₄) b Potassium phosphate (K₄PO₃) c Ammonium chloride (NH₄Cl) 10 Write the chemical formula and the name for K⁺ , PO₄³⁻ a Potassium phosphate (K₃PO₄) b Potassium phosphate (K₄PO₃) c Ammonium chloride (NH₄Cl) 11 What is meant by a Metallic Bond a A mixture composed of the melts of two or more metals. b the attraction force between the positive metal ions and negative valence electron which surround them. c A bond formed when electrons are transferred from one atom to another, creating opposite charges that attract each other. 12 What is meant by the potential of hydrogen PH a A mixture composed of the melts of two or more metals. b A scale ranging between the values 0 to 14 ,used to determine the acidity and basicity of solutions. c the attraction force between the positive metal ions and negative valence electron which surround them. 13 G.R A piece of Sulphur easily crumbles when hammered a Because Sulphur is a brittle non metal. b Because Sulphur is a brittle metal. c Because Sulphur is a malleable non metal. 14 G.R Iron is difficult to hammer a Because iron is malleable and ductile non metal b Because iron is a brittle metal. c Because iron is malleable and ductile metal 15 PH of acid rains can be a 5 b 7 c 11 16 PH of NaOH can be a 4 b 9 c 7 17 The last energy level of metal atoms contains a 3:5 electrons b 1:3 electrons c 5:7 electrons 18 The last energy level of nonmetal atoms contains a 5:7 electrons b 3:5 electrons c 1:7 electrons 19 The structure of all the negative atomic groups that you have studied includes a O b N c H 20 An acid secreted by the stomach that participates in food digestion. a H₂S b HCO c HCl 21 A mixture composed of the melts of two or more metals a Alloy b concrete c Milk of magnesia 22 Rains which result from the dissolution of acidic oxides in the atmospheric water vapour. a Rainfall b Acid rains c Acidic oxides 23 When an acid reacts with an alkali, ………. and ………... are produced. a salt , water b acid , alkali c metal , nonmetals 24 Carbon dioxide gas changes the color of the……… litmus strip to ……… color. a blue , red b red , blue c blue , bleach 25 The molecular formula of an acid begins with the symbol of ………. cation a He (Hilum) b OH (hydroxide) c H (Hydrogen) 26 The molecular formula of an alkali ends with the symbol of ………. anion a OH (hydroxide) b H (Hydrogen) c O (Oxygen)

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Gr7 March science examVersión en línea

por Safaa Samy

What is meant by the Atomic Group

Write the chemical formula of Hydrosulphuric acid.

Write the chemical formula of Hydrosulphuric acid.

Write the chemical formula of Sodium hydroxide.

Write the chemical formula of Sodium hydroxide.

Write the chemical formula of Lithium hydroxide

Write the chemical formula and the name for NH4+, Cl-

Write the chemical formula and the name for NH4+, Cl-

Write the chemical formula and the name for K⁺ , PO₄³⁻

Write the chemical formula and the name for K⁺ , PO₄³⁻

What is meant by a Metallic Bond

What is meant by the potential of hydrogen PH

G.R A piece of Sulphur easily crumbles when hammered

G.R Iron is difficult to hammer

PH of acid rains can be

PH of NaOH can be

The last energy level of metal atoms contains

The last energy level of nonmetal atoms contains

The structure of all the negative atomic groups that you have studied includes

An acid secreted by the stomach that participates in food digestion.

A mixture composed of the melts of two or more metals

Rains which result from the dissolution of acidic oxides in the atmospheric water vapour.

When an acid reacts with an alkali, ………. and ………... are produced.

Carbon dioxide gas changes the color of the……… litmus strip to ……… color.

The molecular formula of an acid begins with the symbol of ………. cation

The molecular formula of an alkali ends with the symbol of ………. anion