Chemistry Quiziz notes

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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


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