Chapter 1
A Statement that proposes an explanation for an observation
Hypothesis
A number that is counted or an equivalency like 5 people or 1L=1000mL
Exact number
Gasoline is an example of this kind of mixture
homogeneous
J.J. Thompson discovered this negative particle with cathode ray experiments.
electron
What is the relationship between frequency and wavelength
Inverse. as wavelength increases, frequency and energy decrease
Write this number in scientific notation: 0.000000345
3.45 x 10-7
Perform this equation using correct significant figures: (3.41 + 6.7)/5.43 x 6.53
0.285
A pure substance containing only one type of matter, which cannot be broken down by chemical methods
element
The atom is made of 3 subatomic particles they are:
proton, neutron, electron
A packet of energy with both particle and wave characteristics that travels at the speed of light
photon
The study of composition, structure, properties and reactions of matter
Chemistry
Write the following number in scientific notation and then change the prefix. 76,500,000 m
7.65 x 107 m or 76.5 Mm
temperature is an example of what kind of property
Intensive
Give the number of protons, neutrons and electrons for 25Mg2+
Protons: 12
Neutrons: 13
Electrons:10
Place the following types of electromagnetic radiation in order of increasing wavelengths: the blue color in a rainbow, X-rays, and microwaves from an oven.
X-rays, blue light, microwaves
The order of the scientific method
Observation
Hypothesis
Experiment
Conclusion
Convert 3.6 × 10⁻⁵ m into picometers.
36,000,000 pm
What is -15 degrees Fahrenheit in degrees celsius and in kelvins? TC = TF-32/1.8 TK=TC +273
-26 degrees celsius, 247 K
Give the name and group number of the 4 named groups.
Group 1 Alkali metals, Group 2 Alkaline-earth metals, Group 17 halogens, group 18 noble gases.
What is the wavelength of light for a wave that has a frequency of 5.0GHz?
60mm
Write this number in standard notation: 3.45 x 107
34,500,000
Perform the following conversion and report with the correct number of significant figures: 76km/L to mi/gal
1km=0.6214mi, 1gal =3.785 L
180mi/gal
A 70.-g piece of nickel metal at 54.0 °C is placed in 25 g of water at 21.9 °C. All the heat lost by the metal is used to heat the water (4.184 J/g°C), and the final temperature of the water and metal is 29.2 °C. What is the specific heat, in J/g°C, of nickel?
0.44 J/g°C
Lead consists of four naturally occurring isotopes. Calculate the atomic mass for lead using the weighted average mass method.
204Pb, 204.0amu, 1.40%
206Pb, 206.0amu, 24.10%
207Pb, 207.0amu, 22.10%
208Pb, 208.0amu, 52.40%
207.2 amu
Ultraviolet radiation (UVB) used to treat psoriasis has a wavelength of 3 x 10-7m, whereas infrared radiation used in a thermal imaging camera has a wavelength of 1 x 10-5m. Which has a higher frequency? Which has a higher energy?
Ultraviolet radiation has a higher frequency and higher energy.