Chemistry Quiziz notes
The line-emission spectrum of an atom is caused by the energies released when electrons
"jump" from a higher energy level to a lower energy level
1000 grams= ________ kilograms
1
How many sig figs are there? 100000000
1
Write the answer in scientific notation 7.3X10^5 + 3.7X10^5=
1.1X10^6
Write the answer in scientific notation 5X10^8-3.4X10^8
1.6X10^8
What is the rounded correct answer for 20.2 cm / 7.41 s
2.73
What is the correct answer to 6.201 cm + 7.4 cm + 12.0 cm= (sig figs)
26.3
What is the correct answer for (2 X 10^7) x (8X10^-9) (sig figs)
2X10^-1
What is the speed of light?
3.0X10^8 m/s
Calculate 345.009 g - 23.009 g and give your answer with the appropriate number of sig figs
322.000 g
Divide: (6.9X10^7) / (2.3X10^-3)
3X10^10
Multiply: (3.4X10^5)(1.2X10^-3)
4.08X10^-15
Which is the more precise measurement? 4 mL, 4.3 mL, 4.30 mL, 4.300 mL
4.300 mL
How would you write 4.3756X10^4 in standard form?
43,756
How many sig figs are there? 100.00
5
How would you write 0.0005 in scientific notation?
5X10^-4
Which of the following are included in the usual steps of the Scientific Method
Defining the problem forming a hypothesis making observations drawing conclusions reporting results
A tentative explanation for a scientific problem, based on currently accepted scientific understanding and creative thinking
Hypothesis
I can jump high in tennis shoes because they have rubber on the bottom Observation, inference, or prediction
Inference
Generalizations, principles, relationships, or patterns in nature that have been established by empirical data
Law
Explanations of perceived representations of reality
Model
Laws are theories that have been proved true Fact or Myth
Myth
Science is never creative Fact or myth
Myth
Science proves ideas Fact or myth
Myth
A tiny bundle of energy by which light travels
Photons
Explanations of scientific laws(also corroborated by empirical data)
Theory
A student nows the mass of an object. What other variable does the student need to know to calculate the object's density?
Volume
For an electron to change from ground state to an excited state it must
absorb energy
Characterize the following as absorption or emission An electron moves from E1 to E3
absorption
Which of the following could be a unit of area? m^3, cm^2, m^2, g/mL, mL
cm^2, m^2
the following liquids are poured together in a beaker: alcohol (density=0.79 g/mL), corn syrup(density=1.38 g/mL), water (density=1.0 g/mL), and cooking oil (density=0.93 g/mL). Which of these liquids will sink to the bottom of the beaker?
corn syrup
The behavior of light can be described in terms of waves or in terms of particles
dual wave-particle nature of light
According to the Bohr model of the atom, which particles are allowed to exist in any one of a number of energy levels?
electrons
Characterize the following as absorption or emission An electron moves from E6 to E3
emission
The process of an atom releasing energy when it moves to a lower energy state is called
emission
characterize the following as absorption or emission an electron moves from E2 to E1
emission
The number of waves that pass a fixed point in a given amount of time is
frequency
In the Bohr model of the atom, in which orbit is an electron in its lowest energy state?
in the orbit closest to the nucleus
Which of the following could be a unit of density? kg/m^3, cm^2, m^2, g/mL, mL
kg/m^3, g/mL
Which of the following could be a unit of volume?
m^3, cm^3, mL
A form of energy that exhibits wave behavior as it travels through space is
microwave radiation, ultraviolet radiation, and infrared radiation
A quantum of energy is the
minimum quantity of energy that can be lost or gained by an atom
Using the 5 senses to understand what is happening around you is called
observing
Bohr's model correctly explains the spectra of atoms with how many electrons?
one
Which color of light in the visible spectrum has the longest wavelength?
red
because excited hydrogen atoms always produced the same line-emission spectrum, scientists concluded that hydrogen
releases energy of only certain values
Band of color in a rainbow, or from a light passing through a prism
spectrum
The distance between one peak and the next in a wave
wavelength