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Two unknown liquids, A and B, were reacted to form a solid C and liquid D. The products of the reaction resemble those of an acid-base reaction. With these observations, can we determine whether liquid A, liquid B, solid C, and liquid D are elements or compounds?
Is melting an ice cube a physical or chemical process?
Select a chemical property of uranium:
An unknown element was observed to have the following properties:
1. It appears as a silvery liquid.
2. It has a density of 13.53 g/cm3 at room temperature.
3. It reacts with molecular iodine to produce a red solid.
4. It freezes at −38.83 °C and boils at 356.73 °C.
5. It forms a yellow solid when combined with dilute nitric acid.
Classify each property as physical or chemical.
Select the extensive property
The summit of a mountain has an average temperature of 13°F. Express the temperature in Kelvin.
True or False: To express a number in a scientific notation, increasing the coefficient value means the exponent is negative while decreasing the coefficient value means the exponent is positive.
In classical mechanics, kinetic energy is defined as the 1/2 mass times the square of speed. Derive a unit for energy starting with SI base units. Using SI prefixes, suggest a convenient unit for the kinetic energy of a car weighing 2500 pounds moving at 45 mi per hour and the kinetic energy of an electron moving at 35% of the speed of light (mass electron = 9.11×10–31 kg, speed of light = 3.00×108 m/s).
What is the equivalent value of 513 mK/s in K/s?
Determine the number of significant figures in the following scientific notation: 2.71×105.
A vehicle's speedometer is shown below. What is its reading in km/hr and mi/hr? How many significant figures should the reading have?
Perform the following operation. Express the answer using the correct number of significant figures.
780 + 6.97 - 81.197
Is a fluid ounce larger than a pint? By how much?
The nitrogen level in an urban apartment is 521 µg/m3. Calculate the mass of nitrogen gas in grams if the urban apartment is 10.2 ft x 9.8 ft x 21.5 ft in dimension.
A student needs cyclohexane for an experiment. They asked their lab partner to get it from the storage cabinet. The lab partner then handed an unlabeled bottle and told them that it was the bottle for cyclohexane that they used in the last experiment. To be sure, they measured 15 mL of the liquid and found that it weighs 26.2 g. A chemistry textbook listed cyclohexane to have a density of 0.773 g/mL at room temperature. Is it possible that the liquid is cyclohexane?
The diameter of a spherical ball of copper is 3.95 cm. If the density of copper is 8.96 g/cm3, determine the mass of the sphere. Use V = (4/3)πr3 to calculate the volume of a sphere, where r is the radius.
An aluminum bicycle frame weighing 3.69 kg was placed in a pool filled with water. The displaced water was measured to be 1.365 L. Calculate the density of the metal.
Identify the element that "X" represents in 7232X.
Determine the heavier atom between 14C and 14N by comparing the total masses of their subatomic particles.
If six electrons were removed from tungsten, 184W, write the symbol of the ion formed.
There are two stable isotopes of chlorine, 35Cl and 37Cl. 35Cl has a mass of 34.9689 amu and a natural abundance of 75.77%. Calculate the m/m % of 37Cl which is the mass of 37Cl in grams contained in 100 grams of chlorine element.
Classify the following as metal or nonmetal.
a. Na
b. Br
c. N
d. Ca
Identify the group name for each element.
a. Ba
b. Cl
c. Ne
d. Na
e. At
Determine if vanadium is a main-group element or not.
Name the following elements with the symbols: Rh, Si, O, P
Visualize elements X and Y as described:
• Element X (atomic element): Atoms represented by triangles.
• Element Y (diatomic molecular element): Atoms represented by squares.
Draw molecular-level views of each of these elements.
Is the statement below true or false?
At standard conditions, some elements only exist as solids.
Identify which among the elements given below loses or gains electrons.
A. Pb
B. Al
C. N
D. I