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Questions in chemistry

[Answered] The type of bond between atoms in a molecule of CO2 (electronegativity difference = ~1) a. hydrogen bond b. ionic bond c. polar covalent bond d. pure covalent bond e. metallic bond

[Answered] Any reaction that absorbs 150 kcal of energy can be classified as: A. Activated B. Exothermic C. Oxidation D. Endothermic

[Answered] Write a word equation for the following reactions: 1. Hydrochloric acid + sodium hydroxide 2. Sulphuric acid + copper hydroxide 3. Nitric acid + sodium hydroxide 4. Hydrochloric acid + calcium hydroxide 5. Sulphuric acid + potassium hydroxide 6. Hydrochloric acid + lithium hydroxide 7. Nitric acid + magnesium hydroxide

[Answered] What is the empirical formula of a compound that is 79.8% carbon and 20.2% hydrogen?

[Answered] What are eight elements named after towns?

[Answered] In order to separate two substances by fractional crystallization, the two substances must differ in which of the following? A. Solubility B. Specific gravity C. Vapor pressure D. Viscosity E. Freezing point

[Answered] Choose from the following descriptions for solid HCl(s): A. Composed of macromolecules held together by strong bonds B. Composed of atoms held together by delocalized electrons C. Composed of positive and negative ions held together by electrostatic attractions D. Composed of molecules held together by intermolecular dipole-dipole interactions E. Composed of molecules held together by intermolecular London forces

[Answered] How many moles of \(\text{NO}_3\) are there in 6.2 g?

[Answered] Which two of these are chemical reactions? Tick two boxes. - You dissolve a spoonful of sugar in water. - Bread goes brown in the toaster. - You take an ice lolly out of the freezer and it starts to melt. - Frost forms on the grass on a cold night. - You strike a match to light a Bunsen burner.

[Answered] You can put out a chip pan fire by putting a damp cloth over the pan. Explain why this works.