1. Which of the following is a chemical change? A) cooking an egg B) mixing oil and water C) tearing a piece of paper D) watching a DVD 2. Which of the following is a physical change? A) Condensation forms on cold glass. B) Glass reacts with hydrofluoric acid. C) A ground glass joint slowly forms sodium silicate when exposed to NaOH. D) Cobalt salts dissociate in a piece of blue stained glass. E) Silica is hydrated, forming silicic acid. 3. Which one of these represents a CHEMICAL change? A) lard when heated changes to liquid B) water disappears from a beaker in a few days at room temperature C) sugar dissolving in water D) milk turns sour after sitting at room temperature for a few days E) water boils below 100°C on a mountain
1. Which of the following is a chemical change? A) cooking an egg B) mixing oil and water C) tearing a piece of paper D) watching a DVD 2. Which of the following is a physical change? A) Condensation forms on cold glass. B) Glass reacts with hydrofluoric acid. C) A ground glass joint slowly forms sodium silicate when exposed to NaOH. D) Cobalt salts dissociate in a piece of blue stained glass. E) Silica is hydrated, forming silicic acid. 3. Which one of these represents a CHEMICAL change? A) lard when heated changes to liquid B) water disappears from a beaker in a few days at room temperature C) sugar dissolving in water D) milk turns sour after sitting at room temperature for a few days E) water boils below 100°C on a mountain
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter1: Chemistry And Measurement
Section: Chapter Questions
Problem 1.23QP: Physical and Chemical Changes Say you are presented with two beakers, beaker A and beaker B, each...
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Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Question
1. Which of the following is a chemical change?
A) cooking an egg
B) mixing oil and water
C) tearing a piece of paper
D) watching a DVD
2. Which of the following is a physical change?
A) Condensation forms on cold glass.
B) Glass reacts with hydrofluoric acid.
C) A ground glass joint slowly forms sodium silicate when exposed to NaOH.
D) Cobalt salts dissociate in a piece of blue stained glass.
E) Silica is hydrated, forming silicic acid.
3. Which one of these represents a CHEMICAL change?
A) lard when heated changes to liquid
B) water disappears from a beaker in a few days at room temperature
C) sugar dissolving in water
D) milk turns sour after sitting at room temperature for a few days
E) water boils below 100°C on a mountain
4. Why is the dissolving of sugar in water a physical change?
A) the chemical composition of the sugar changes
B) the water gets sweeter
C) the sugar changes from the solid state to the aqueous state
D) the water surrounds the sugar molecules
5. Which of the following metric prefixes corresponds to 10⁻⁶?
A) centi-
B) kilo-
C) mega-
D) micro-
E) milli-
6. The density of water is approximately 1 g/cm³. Which of these objects will float on water?
A) Cedar wood block, d = 0.380 g/cm³
B) Nylon, d = 1.150 g/cm³
C) Glycerol, d = 1.26 g/cm³
D) Diamond, d = 3.5 g/cm³
7. A sample of blood is found to contain 64.5 micrograms of valproic acid. How many milligrams of valproic acid does this blood sample contain?
_____mg
8. A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 6.1 mL. If the metal weighs 3.3 g, what is the density of the metal in g/mL?
_____g/mL
9. A chemist has a block of lead metal (density is 11.3 g/mL). They drop the metal into a graduated cylinder containing water, and find the volume change is 2.70 mL. What is the mass of the block, in grams?
_____g
10. A student is determining the density of an unknown metal with a mass of 56.5 g. The student partially fills a graduated cylinder with water and measures the volume of the water by itself as 54.8 mL. The student then adds the metal to the water and measures the new volume as 87.3 mL. What is the density, in g/mL, of the metal?
_____g/mL
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