chapter 1-7 vocab
anthing that has mass and takes up space is
What is matter
An atom the smallest unit of matter that cannot be broken down and still be matter
what is true
the formula for avogadro's number is:
what is 6.022* 1023
Round the number to three significant figures: 834.034
cutting paper is an example of
What is physical change
the study of matter is
What is chemistry
anion is a positive charge and cation is a negative charge
What is false
What is the formula for scientific notation
What is 1.3 ×106
Multiply the following measured numbers and round answer to the lowest number of significant figures. 42.811 x 0.23
What is 9.8
a change that results in a new substance or substances being created with different properties
What is a chemical change
a given number is written as the product of two numbers: a coefficient and a 10 raised to a power
What is scientific notation
two or more atoms held together by a chemical bond
What is a molecule
What are the formulas for frequency, velocity, and wavelength
what is f=(s1 or Hz) v=(m/s or ms-1) wavelength=(m)
Which of following rules does not belong?
A. 4.5 g
B. 0.0004 s
C. 206 m
D. 4.8 X 10^-3 kg
What is B
An atom or group of bonded atoms that has a positive or negative charge
What is ion
valence electrons are the electrons in the highest occupied energy level of an element's atoms
What is true
For Kw, the product of [ H30+] and [OH-] is
what is 1.0x10⁻¹⁴
Exact numbers are those numbers that:
A. numbers obtained by counting items or using a definition that compares two units in the same measuring system
B. Do not affect the number of significant figures in a calculated answer
C. Are not measured
D. All the above
what is D all of the above
when energy is absorbed during a physical or chemical change
What is endothermic change
a structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bond
What is lewis structure
molar mass The mass in grams of one mole of any pure substance
What is true
Combined gas law
what is (P1V1)/T1 = (P2V2)/T2
Which of the following rules does not belong?
A. 1 250 000 g
B. 850 000 m
C. 122.35 m
D. 0.075 cm
What is: C. 122.35 m
energy stored in bonds between atoms
What is chemical energy