Chem 1 study st
A gold bar is an example of a(n)
element
Which of the following is an intensive property of a sample of neon gas? A) Its mass B) The number of neon atoms present C) Its temperature D) Its volume E) The number of moles of neon atoms present
its temperature
Which of the following states of matter is portrayed by the following description: assumes the shape of its container because it has a definite volume but no specific shape?
liquid
A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 5.3 mL. If the metal weighs 3.3 g, what is the density of the metal in g/mL?
mass/volume = density
Which prefix corresponds to 10⁶?
mega-
What is the name of the SI unit for length?
meter
Which metric prefix corresponds to 10⁻⁶?
micro-
A bar of soap is an example of a(n)
mixture
A theory is another word for a(n)
model
Which of the following is a step that is NOT in the scientific method? A) making observations B) formulating hypotheses C) modifying laws D) performing experiments
modifying laws
A homogeneous mixture is also called a
solution
How many significant figures does the number 48.050 have?
5
Which of the following describes a chemical change involving water? A) H₂O(l) → H₂O(s) B) H₂O(s) → H₂O(g) C) H₂O(l) → H₂(g) + ½O₂(g) D) H₂O(g) → H₂O(l)
H20(l) = H2(g)+1/2O2(g)
Gasoline is composed of a variety of different liquid hydrocarbons, which do not separate as time passes. Gasoline is an example of a:
solution
If the density of 10W motor oil is 0.860 g/cm³, will it be above or below pure water?
above
Which of the following is a pure substance that cannot be broken down into simpler substances by chemical means? A) Homogeneous mixture B) Chemical compound C) Chemical element D) heterogeneous mixture E) Solution
chemical element
"Laughing gas" (dinitrogen monoxide, also called nitrous oxide) is an example of a(n)
compound
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.
condensation forms on cold glass
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
cooking an egg
Which of the following are physical properties of matter? A) stability B) reactivity C) density D) flammability
density
Which of the following is an extensive property of the element carbon? A) Its boiling point B) The temperature of a carbon sample C) Its freezing point D) The mass of a carbon sample E) Its density
the mass of a carbon sample
Water has a density of 1.00 g/cm³, whereas cooking oil has a density of 0.93 g/cm³ and the ice cube had a density of 0.917 g/cm³. Which of the following correctly orders the layers in a mixture of cooking oil, water, and ice? A) water on the bottom, oil at the surface, ice in the middle B) ice on the bottom, water at the surface, oil in the middle C) water on the bottom, ice at the surface, oil in the middle D) oil on the bottom, water at the surface, ice in the middle
water on the bottom, ice at the surface, oil in the middle
Which one of the following is the longest length? (1 ft = 12 in, 1 in = 2.54 cm) A) 3.2 m B) 145 in C) 16.0 ft D) 3800 mm
16.0 ft
Which one of the following is an example of a homogeneous mixture? A) pure water B) carbonated soda C) apple juice D) pulpy orange juice
Apple juice
Three blocks of the same shape and size are placed in front of you. Block A has a mass of 3.0 g, block B is 5.0 g, and block C is 10.0 g. Which has the higher density? A) Block A B) Block B C) Block C D) All blocks have the same density. E) There is no way to determine without the volume.
Block C
You have a 100 gram sample of each of the following metals. Which sample has the largest volume? A) Aluminum, d = 2.7 g/cm³ B) Gold, d = 19.3 g/cm³ C) Iron, d = 7.86 g/cm³ D) Magnesium, d = 1.74 g/cm³ E) Silver, d = 10.5 g/cm³
Magnesium, d= 1.74 g/cm³
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
Milk turns sour after sitting at room temperature for a few days
In the process of making biofuel from corn, the corn is ground, mixed with water, and then enzymes are added to hydrolyze the starch into smaller sugar molecules. The fermentation produces ethanol and carbon dioxide. In a subsequent step, a microorganism ferments the sugars into ethanol and carbon dioxide. The ethanol is further distilled for use as a biofuel. In this process ______ is an example of a chemical change.
fermenting the starch
A human is an example of a(n)
heterogeneous mixture
Which of the following represents an exact quantity? A) There are 2.54 cm in an inch. B) A man is 5 feet 10 inches tall. C) A man weighs 200 lb. D) It takes 15 minutes to drive to the grocery store. E) There are 80 grams of sugar in a serving of soda.
there are 2.54 cm in an inch
