SIGNIFICANT FIGURES
Which of the following is not a rule for zeros when it comes to significant figures?
A. Zeros between two nonzero numbers are significant
B. Zeros to the right of a number are always significant no matter if there is a decimal or not
C. Zeros to the left of a number are not significant.
What is B
How many atoms are there in a Helium balloon weighing 1.776 grams?
What is 2.672 x 10^23 atoms He?
What is the difference between an ion and an isotope?
a. Ions have different numbers of electrons and isotopes have different number of protons
b. Ions have different numbers of protons and isotopes have different number of electrons
c. Ions have different numbers of electrons and isotopes have different number of neutrons
d.Ions have different numbers of neutrons and isotopes have different number of electrons
What is C?
How is the periodic table organized?
What is by increasing atomic number?
How does potential energy change when oppositely charged particles move farther away from one another?
What is increasing ?
How many significant figures are in 0.00334000?
What is 6?
How many molecules of HCl are in 8.94 L of HCl acid at 25°C if the density equals 1.096 g/mL?
What is 1.62 x 10^23 molecules HCl?
How many protons, neutrons, and electrons are present in Sn-1 - 121?
What is 50 protons, 71 neutrons, and 51 electrons?
Which of the seven diatomic elements is liquid at its standard state?
What is Bromine (Br2)?
Chlorophyll absorbs 430 nm (blue) and 662 nm (red) light. Which of these has a longer wavelength?
What is red?
What is 83.4568 mL + 20.0 mL with correct significant figures?
What is 103.5 mL?
What is the mass in kg of 9.75 x 10^26 molecules of Hydrogen Sulfide (H2S)?
What is 5.52 x 10^-25 kg H2S?
How many protons, neutrons, and electrons are present in Ni+3 - 64?
What is Protons: 28, neutrons: 36, electrons: 25 ?
Which of the following presents the correct pairing of the element with its name?
a. Kr-krypton
b. K-krypton
c. Mn- magnesium
d. Co-copper
What is A?
What is the wavelength in nm when the frequency is 51 Hz?
What is 5.88 x 10^15 nm?
What is 40 g x 22.5 g with correct significant figures?
What is 900 g ?
The total amount of fresh water on earth is estimated to be 3.73 x 108 km3. What is this volume in liters?
What is 3.73 x 10^20 L?
Europium has 2 isotopes E-151 and E-153. E-151 has an isotopic mass of 150.919846 amu with a natural abundance of 47.81%. E-153 has an isotopic mass of 152.921226 amu with a natural abundance of 52.19%. Determine the average atomic mass of Europium with correct sig figs.
What is 151.96 amu?
What are the properties of metals?
What is malleable, conductive, and ductile?
What is the energy of a photon in kilojoules that has a wavelength of 240 nm?
What is 8.28 x 10^-16 KJ * s
What is (110.765 – 30.2) / 7.62 with correct significant figures?
What is 10.569?
Winnipeg is refilling the pool. How many gallons of water will it take if the pool is 50m by 25m by 1.5m? (1 gallon = 3.786 L)
What is 5 x 10^5 gallons?
Chlorine has 2 isotopes Cl-35 and Cl-37. Cl-35 has an isotopic mass of 34.968853 amu and Cl-37 has an isotopic mass of 36.965903 amu. Chlorine has an average atomic mass of 35.454 amu. What are the natural abundances of each of the isotopes?
What is Cl-35: 75.71% & Cl-37 : 24.29% ?
Which of the following elements is most similar property-wise to Au-gold?
a. Ag-silver
b. Pt-platinum
c. Mg-magnesium
d. Zn-zinc
What is A- Ag(silver)?
What is the number of photons having a wavelength of 10.0 micrometers required to produce 1.0 kJ of energy?
What is 5.0 x 10^22 photons?