Numbers in Science
The SI unit for mass
What is the kilogram? Will also accept gram
Atoms of the same element that have different number of neutrons.
What are isotopes?
The element in period 2 group 15 will form an ion with this charge
What is 3-?
What are metals & nonmetals?
The name of the molecular compound with the formula CS2
What is carbon disulfide?
0.0015 expressed in scientific notation
What is 1.5 x 10-3?
The mass number of an isotope of mercury that has 80 protons and 120 neutrons
What is 200?
The element in period 3 group 17 will form an ion with this charge
What is 1-?
The type of bond formed between two oxygen atoms
What is a double, nonpolar covalent bond?
The formula of the ionic compound formed between lithium and oxide ions
What is Li2O?
12.655 cm rounded to four significant figures.
What is 12.66 cm?
The atom model that says that electrons can be found based on probabilities of their location due to their amount of energy
What is the quantum mechanical atom model?
A reason why fluorine is more reactive than iodine
What is fluorine has a larger electron affinity (also higher electronegativity) due to its small atomic radius?
The shape of the PCl3 molecule (correct name of the shape or correct geometrical drawing)
What is trigonal pyramidal?
The formula of the ionic compound formed between magnesium and carbonate ions.
What is MgCO3?
A representation of data
What is a graph?
The electron configuration of sulfur
What is 1s22s22p63s23p4?
A reason why cesium is more reactive than sodium
What is cesium has a lower ionization energy due to its larger atomic radius?
Explain the reason for any of the following properties of ionic compounds (high melting point, brittle solids, conduct electricity if dissolved in water).
Ionic compounds have high melting points because of the strong attraction for each ion to other ions in the crystal structure, they are brittle solids because ionic compounds form crystals that if the structure is shifted like charges repel, and conduct electricity if dissolved in water because when dissolved the ions are free to move and conduct the charge of electricity?
What is copper(I) sulfide?
The number 100 written in scientific notation with four significant figures.
What is 1.000 x 102?
The element with the electron configuration [Xe]6s24f145d106p2
What is lead?
Explain why ionization energy is a measure of the reactivity of metals and electron affinity is a measure of the reactivity of nonmetals.
Because ionization energy is a measure of how much energy it takes to remove an electron (metals tend to lose their valence electrons) whereas electron affinity is a measure of the amount of energy released when an atom gains an electron (nonmetals tend to gain valence electrons)?
What is polarity of the H2S molecule and why
The molecule H2S is a polar molecule because each H-S bond is polar and the pull is towards the sulfur atom since the shape of the molecule is bent which makes the sulfur end of the molecule slightly negative and the hydrogen ends of the molecule slightly positive
The name and formula of the ionic compound formed between the nickel(II) and nitrate ions
What is nickel(II) nitrate, Ni(NO3)2?