| Math review | Classification of Matter | Atoms, Molecules, Ions | Introduction to Periodic Table | Intro Chemical Bonding |
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Write the number of Significant Figures in 51,510
Then convert the number to 3 significant figures Then convert the number to scientific notation
The number of Significant Figures: 4
Then Convert the number to 3 significant figures: 51,500 Then convert the number to scientific notation:5.15*10^4 |
What is a pure substance?
Pure Substance is that are made of only one type of atom or only one type of molecule (a group of atoms bonded together).
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Who was the first scientist to discover electrons and plum pudding model ( atomic model ) using the cathode rays ?
The scientist is J.J Thompson.
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How are the element arranged on the periodic table?
The elements are arrange by the number of protons.
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Why do all elements react ?
They all react to attain a greater stability( lower energy) by attaining a noble gas configuration.
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What is quantitative and qualitative data?
Quantitative data is information that can be measured and written down with numbers.
Qualitative data is is when descriptive statements can be made about a subject based on observations, interviews or evaluations. |
What is a mixture?
A mixture is a combination of two or more pure substances in which each pure substance retains its individual chemical properties.
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What did Rutherford discover and how did he do it ?
Rutherford was the first to give the nuclear atoms model. He used the gold foil experiment. He discovered the atom is mostly empty space and they have a dense, small center of positive charge called a nucleus. The electrons travel a long distance around the nucleus.
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How are the elements arranged in groups on the periodic table?
The elements are arranged by the number of valence electrons.
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How many electrons does it take for an element to be stable ?
It takes eight electrons for the element to become stable according to the octet rule. With the exception of duet rule, it take 2 valence electron for the hydrogen to become stable.
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What is the difference between precision vs. accuracy?
Precision is the closeness of two or more measurements to each other.
Accuracy is the degree of closeness of measurements of a quantity to that quantity's true value. |
What is the difference between chemical and physical changes? And give an example of each.
A physical change is in a substance doesn't change what the substance is. An example is phase changes.
A chemical change is when a new substance is formed and energy is either given off or absorbed. An example is baking a cake. |
What are the subatomic particles and what are the mass and charge for each subatomic particles ?
The subatomic particle is electrons, neutrons, and protons.
The protons have a positive charge and weight about 1 amu. The electrons have a negative charge and weight is insignificant compared to proton and neutron. The neutron has a neutral charge and weight about 1 amu. |
What are groups and periods on the periodic table?
The periods are horizontal( across) and the groups are down the periodic table.
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What is a covalent bond?
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
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Convert 9,474 mm to cm. Don't forgive about SIG FIGS.
947.4 cm
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What is the difference between a homogenous and heterogeneous mixture and an example of each mixture?
Homogenous mixture is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture. An example is sugar water.
Heterogenous mixture is a a mixture where the components of the mixture are not uniform or have localized regions with different properties. An example is cereal in milk or vegetable soup. |
Write the isotope symbol for a carbon with a negative 4 charge. State what each number on the symbol stands for ? Also, how many electrons does the carbon have?
Carbon has 10 electrons. Look on board for rest of answer.
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Name all of the diatomic molecules.
H2, N2 , O2, F2, Cl2, Br2 and I2
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What is an ionic bond and what are cations and anions?
An ionic bond is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions.
Cations have positive charge and give away valence electron. Anions have a negative charge and gain valance electrons. |
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Convert a density of 13.6 g/mL to its equivalent in lb/ft3. Then convert answer to scientific notation.
849 lb/ft^3
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Is an aqueous solution a pure substance or a mixture ?
Aqueous solution is homogenous mixture.
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Titanium has five common isotopes: 46Ti(8.0%), 47Ti( 7.8%), 48Ti(73.4%), 49Ti(5.5%), 50Ti(5.3%).What is the average atomic mass of titanium?
47.92 amu
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Come up to the board a show the basic arrangement of the periodic table.
Will show no the board.
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Calculate the molar mass of CaCl2.
The mass is 110.98.
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