Flashcards
Study guide for chemistry
Flashcards do conjunto (66)
- 1In what year did John Dalton created the very first atomic theory?in 1808
- 2How did John Dalton viewed atoms?As tiny solid balls
- 3"Atoms of one element are all the same" is that true or false?false because atoms of the same element can have different number of neutrons
- 4What did J.J Thomson discovered in 1897?electrons that have a negative charge and are found inside a (+) dough
- 5What is J.J Thomsons model known as?The raisin bun model
- 6What did Ernest Rutherford discovered in 1911?protons and neutrons, he calles the positive charge ones protons and he called the center of the atom nucleus
- 7What did Niels Bohr proposed in 1913?That electrons move around the nucleus in specific layers or shells
- 8What did James Chadwick discovered in 1932?He discovered particles with no charge that he called neutrons and that neutrons are found inside the nucleus.
- 9How is the current atomic model named?The modern model
- 10What does the new atomic model has?electrons moving around the nucleus in a cloud?
- 11What charge does protons have?positive charge
- 12What mass does protons have?A mass of one
- 13What charge does neutrons have?no charge
- 14What mass does neutrons have?A mass of one
- 15What charge does electrons have?a negative charge
- 16What mass does electrons have?no mass
- 17When does a neutral atom happens?When they have the same number of protons and electrons
- 18What is the atomic number?the number of protons
- 19What does the atomic mass number includes?The number of protons and neutrons
- 20What is the atomic mass unit?amu
- 21What are isotopes?Isotopes are different versions of the same element, they have the same atomic number but different number of neutrons
- 22When does an atom have a net charge of 0?When they have the same number of positive and negative particles
- 23What is the relative atomic mass?The relative atomic mass (A) of an element is the average mass of the naturally ocurring atoms of the elements
- 24Of who is this atomic model?Democritus
- 25Of who is this atomic model?John Dalton
- 26Of who is this atomic model?J.J Thomson
- 27Of who is this atomic model?Ernest Rutherford
- 28Of who is this atomic model?Niels Bohr
- 29Of who is this atomic model?James Chadwick
- 30Of who is this atomic model?Is the Modern atomic model
- 31What is the scientific method?Is the way or steps someone takes to solve a problem
- 32What is the first step in the scientific method?Ask a question or identify a problem
- 33What is the second step in the scientific method?Gather information and form a hypothesis
- 34What is the third step in the scientific method?Create an experiment to test your hypothesis
- 35What is the fourth step in the scientific method?Collect a data and observations by doing the experiment
- 36What is the five step in the scientific method?Draw a conclusion
- 37What is the sixth step in the scientific method?Share your findings
- 38What is a hypothesis?Is an educated guess
- 39What are the words used in a hypothesis?If , then , because.
- 40What are controlled experiments?They are used to test a hypothesis
- 41What are the two groups of controlled experiments?A control group and an experimental group
- 42What is the control group?A group in the experiment in wich you are not testing anything
- 43What is the experimental group?The group in wich you are testing something
- 44What is scientific notation?Is a shorthand way of writing very large or very small number.
- 45What is an estimation?Is using your knowledge of something similar in size or amount to determine the size of the new object
- 46What does length measures?It measures distance between objects
- 47What does volume measures?It measures the amount of space something takes up
- 48What does mass measures?It measures the amount of matter in an object
- 49What are other types of measurements?-Time
-Temperature
-Density
-PH - 50What are standards?Are exact quantities that everyone agrees to use as a basis of comparison
- 51What is matter?Everything that occupies space
- 52What are physical properties?They are properties that describe the physical characteristics of a substance
- 53What are chemical properties?They are properties of a substance that describe how the chemicals composition will change.
- 54What are intensive properties?Properties of a substance that do not depend on the amount of matter present
- 55What are extensible properties?Properties of a substance that depend on the amount of matter present
- 56What are the characteristics of physical changes?- No new substance is formed
- Change in appearence only
- Easily reversible - 57What are the characteristics of chemical changes?- Formation of a new substance with different properties from the original substance
- Difficult to reverse
-Change in temperature, color, light, sound, odor, fizzing - 58What is a mixture?When two or more materials or substances are mixed together
- 59What is the method of mechanical separation?Is often by hand and takes advantage of physical properties.
- 60What is the method of sifting or sieving?Used to separate a dry mixture by passing it through a sieve
- 61What are the characteristics of metals?- lustrous (shiny)
- good conductors
- high melting point
- high density
- malleable - 62What are the characteristics of nonmetals?- dull (shiny)
- poor conductors
- nonductile
- brittle
- transparent as a thin sheet - 63What are the characteristics of metalloids?- semi-conductor
- dull
- shiny
- brittle
- malleable - 64What are periods?Periods are rows on the periodic table
- 65What are group/families?A group/family is a column in the periodic table
- 66How many groups are there in the periodic table?18
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- Segundo Chemistry FlashCards sobre Study guide for chemistry, criado por Veronica Sosa em 18-11-2021.
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- Veronica Sosa
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