Chemistry Unit Test - Review

The mass number of a chromium atom is 52 and it has 24 protons. How many neutrons does this atom have? 24 28 76 80

28

What are some applications of the field of spectroscopy? Check all that apply. for identifying elements in a sample for determining the distance and velocity of galaxies for producing neon lights for determining types of chemical bonds for use in medical imaging devices for killing bacteria in foods

1, 2, 3, 4, 5

The table below gives the data that is needed to calculate the average atomic mass of element B. Isotope Atomic mass (amu) Relative abundance (%)B-1010.0119.91B-1111.0180.09Based on these data, what is the average atomic mass of element B? 10.01 10.51 10.81 11.01

10.81

Which property would xenon most likely have? A.) It is stable. B.) It is a solid. C.) It is flammable. D.) It is silver in color.

A.) It is stable

Which statement describes heterogeneous mixtures? A.) They are made up of two or more pure substances that are not chemically bonded together. B.) They appear uniform, like a pure substance. C.) They have fixed ratios between their components. D.) They are made up of two or more pure substances that can be separated only by chemical processes.

A.) They are made up of two or more pure substances that are not chemically bonded together

What is the energy of a photon with a frequency of 1.7 × 1017 Hz? Planck's constant is 6.63 × 10-34 J•s. 1.1 × 10-17 J 1.1 × 10-16 J 8.3 × 10-16 J 8.3 × 10-15 J

B.) 1.1 x 10-16 J

Which of these properties is the best one to use for identification of an element? A.) the number of neutrons in the atomic nucleus B.) the number of protons in the atomic nucleus C.) the number of isotopes that are formed by the element D.) the number of charges on ions of the element

B.) The number of protons in the atomic nucleus

Which of the following observations would indicate that a material is a pure substance? A.) It does not dissolve in water. B.) It changes color after heating. C.) It cannot be physically broken down into different types of atoms. D.) It can be physically broken down into different types of molecules.

C.) It cannot be physically broken down into different types of atoms

Which idea did Isaac Newton's experiments with light support? A.) Light is produced by the interaction of magnetic and electric fields. B.) Light is a wave because it has properties that are similar to radio waves. C.) Light is made of particles because it travels only in a straight path. D.) Light is a wave because it bends around barriers.

C.) Light is made of particles because it travels only in a straight path.

Which is most likely true about electronegativity? A.) It tends to be the same across a period. B.) It tends to be the same down a group. C.) It tends to increase across a period. D.) It tends to increase down a group.

C.) it tends to increase across a period

Which element would most likely have chemical properties similar to that of magnesium (Mg)? Ar Ca F Ni

Ca

A piece of sodium metal can be described as A.) a pure substance and a compound. B.) an impure substance that is reactive. C.) an impure substance that is unreactive. D.) a pure substance and an element.

D.) A pure substance and an element

Which shows the electron configuration for zinc (Zn)? [Kr]5s24d10 [Kr]5s24d6 [Ar]4s23d9 [Ar]4s23d10

D.) [Ar]4s23d10

What is the predicted order of first ionization energies from highest to lowest for lithium (Li), sodium (Na), potassium (K), and rubidium (Rb)? Rb > K > Na > Li K > Rb > Na > Li Li > Na > K > Rb Rb > K > Li > Na

Li > Na > K > Rb

Which physical method can separate a mixture of steel ball bearings and marbles? boiling evaporation filtration sorting

Sorting