Answer:
1. Sodium (Na) is the most reactive due to its lower number of shells which enables the protons in it's nucleus to attract more electrons.
2. Calcium (Ca) is next as it is a group 2 element and they can be quite reactive.
3. Zinc (Zn) is the third reactive as transition metals are not very reactive.
4. Copper (Cu) is less reactive than Zinc because it is closer to the center of the periodic table and therefore has more stability.
5. Gold (Au) is the least reactive.
How were the elements in the first periodic table arranged? O A. In order of atomic number B. Alphabetically by element name C. In order of date of discovery O D. In order of atomic mass
Answer:
in order of their atomic mass
The first periodic table created by Mendeleev was based on the atomic masses of elements. Later Mosely modified it based on the atomic number.
What is periodic table ?Periodic table is the classification of all the known elements based on their atomic number. There are 118 elements in periodic table now. They are classified into different groups and periods.
Mendeleev was first to create periodic table for the easy classification of elements. He classified elements based on their atomic masses. At that time there were only 60-65 elements discovered.
Later Mosley modified it to modern periodic table based on the increasing order of atomic number of elements. Therefore, the first arrangement was based on atomic masses.
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During a process called photoact, ________ give up an electron as a part of the light-dependent reactions.
Answer:
Chloroplasts?
Explanation:
The table shows four reactions.
Reactions
Reaction Equation
1 C3H8 + 5O₂ → 3CO₂ + 4H₂O
2 C₂H4 + H₂ → C₂H6
3 AgNO3 + NaCl - AgCl + NaNO3
4 2Fe + O₂ → 2Feo
Which of the above reactions is an example of combustion of an organic substance?
a) 1
b) 2
c) 3
d) 4
Answer:its B
Explanation:
i have done this before! and i got 100 so i hope you got all the other questions right!
The table shows four reactions. The reaction That is an example of combustion of an organic substance is C₂H₄ + H₂ → C₂H₆. The correct option is b) 2.
What are combustion reactions?Combustion reactions are those reactions in which the reactant reacts with oxygen and produces heat and light. An example is the burning of wood, it happens in the presence of oxygen.
Organic compounds are those compounds that are made by carbons. They are made by carbon-carbon or carbon-hydrogen bonds. They are naturally present in nature.
C₂H₄ + H₂ → C₂H₆
The equation above shows the reaction between methane and hydrogen, which is forming ethane in the presence of oxygen.
Thus, the correct option is b) 2. C₂H₄ + H₂ → C₂H₆.
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the stomach, small intestine, and large intestine are all organs. when they work together to process food, they form a functional unit known as
Answer:
Organ System
Explanation:
These organs are helping each other process food and therefore be an Organ System
What is a polyatomic compound?
What is a polyatomic compound?
➡A polyatomic ion is an ion that contains more than one atom. This differentiates polyatomic ions from monatomic ions, which contain only one atom.
#CarryOnLearningA 10.0 L balloon contains helium gas at a pressure of 655 mmHg. What is the final pressure, in millimeters of mercury, if the final volume is 13.8 L? Please show your work in order to receive credit.
Answer:
474. 64 mm Hg
Explanation:
P1 = 655 mm Hg V1 = 10 LP2 = ? V2 = 13. 8 Lusing Boyle's Law that is
P1. V1 = P2. V2
655 × 10 = P2 × 13. 8
[tex]P2 = \frac{655 \times 10}{13.8} [/tex]
P2 = 474. 64 mm Hg
¿Qué características distinguen a los coloides de otras mezclas?
Please a little help in this I will really appreciate it
Answer:
b is your answer...........
What are the effects of acid precipitation in city centers
Answer:
Answer to the following question is as follows.
Explanation:
Acid rain causes harm to houses and buildings by dissolving stone or corroding metal exposed to the elements. Acid rain can degrade calcium carbonate or calcium-based chemicals found in some of these products.
The acidic particles damage metal and accelerate the deterioration of paint and stone. They also make buildings and other structures, like as monuments, filthy.
Someone please do a True or false of all of these
Answer:
1. False
2. True
3. False
4. False
5. True
6. False
7. True
8. True
9. True
The charge on a charged sphere is concentrated at (or on) its ________.
Central Core
Interior
Surface
I ANSWERED IT BUT SOMEONE SYAYS ITS COPY SO WHAT COULD I DO ;(
Answer:
The charge on a charged sphere is concentrated at (or on) its central core .hope it is helpful to you
A UV wave has a smaller___
than visible light.
Answer:
wavelength
Explanation:
How many atoms are there in 1 g of argon?
The Avogadro constant is 6.02 × 1023 per mole.
Relative atomic mass (Ar): Ar = 40
Answer:
1.5057×10^22 atom
Explanation:
As we
1 mole of argon = 40 g of argon
i.e 40 g of argon = 1 mole of argon
1 g of argon = 1/40 mole of argon
1 mole of argon = 6.023×10^23 atom of argon
1/40 mole if argon = 1/40 ×6.023×10^23
= 1.5057×10^22
The number of atoms of Argon in 1 g would be 1.51 × 10²²
To find out the number of atoms of Argon in 1 g of Argon, the number of moles has to be calculated from which the number of atoms can be derived.
The molecular mass of Argon is 40. The number of moles of Argon is calculated as:
Number of moles of Argon = [tex]\frac{Mass of Argon in grams}{Molecular mass of Argon}[/tex]
Substituting molecular mass as 40 and mass in grams as 1. we get:
Number of moles of Argon = [tex]\frac{1}{40}[/tex] = 0.025 mol
Number of atoms in 1 mole of any substance is given by Avogadro's number as 6.022 × 10²³.
Thus, number of atoms of Argon in 0.025 moles would be
= 0.025 × 6.022 × 10²³
= 0.151 × 10²³ or 1.51 × 10²²
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Consider the following reaction, where A and
E are hypothetical elements.
A + 3E --> AE3
The atomic mass of A is 42.1 amu.
The atomic mass of E is 56.2 amu.
If 42.6 g of A fully reacts, how many grams of
AE3 are expected to form?
Enter your numerical answer to 1 decimal
place. Do not include the units of "g".
Answer:
Enter your numerical answer to 1 decimal place. Do not include the units of "g". Question: Question 14 1 pts Consider the following reaction, where A and E are hypothetical elements. A+3E --> AE The atomic mass of A is 42.1 amu. The atomic mass of Eis 56.2 amu. If 42.6 g of A fully reacts, how many grams of AE, are expected to form?
What are the basic elements of selection of proffesion?describe any two
Answer:
overall I think one answer
if drop a watermelon from the top of one of the tower dorms at CSU, and it takes 3.34 seconds to hit the ground, calculate how tall the building is in meters and then convert into feet.
Answer:
179.5 feet
Explanation:
54.718 m converted to 179.5 feet.
Hello, if any of y'all don't mind, can one of you answer these 5 questions.
Answer:
4.. increases
5..lowers
6.. increases
7.. increases
8.. speed
Answer:
When a substance is heated, its temperature rises because its molecules move faster and gain thermal energy. Temperature measures the "hotness" or "coldness" of an object. The term heat refers to thermal energy being transferred from a hotter system to a cooler one.
Help me :( plzzzz :(
Answer: 1.80
Explanation:
The biosphere is made of different kinds of matter. Which substance is an
example of inorganic matter?
O A. Iron
B. Fat
C. Glucose
D. Protein
How do you think the bonds between carbon atoms might be different in diamond and graphite?
Both have Giant Covalent Structures, resulting in very high melting temperatures. However each carbon atom in Diamond has 4 covalent bonds with other Carbons, making it extremely strong and hard. On the other hand, each carbon in graphite is bonded to three carbons, and therefore graphite is formed in layers.
Help please! Given that the enthalpy of reaction for a system at 298 K is –292 kJ/mol and the entropy for that system is 224 J/mol*K, what's the free energy for the system?
a) -87,793 kJ
b) -225 kJ
c) -66,751 kJ
d) 358 kJ
Answer:
C. -66, 751 kjExplanation:
hope it helps
define hydroscopy in chemistry
Answer: A hygroscopic substance is one that readily attracts water from its surroundings, through either absorption or adsorption
Explanation:
Gallium has two natural occuring isotopes: Ga-69 with 68.9256 amu and a natural abundance of 60.11%, and Ga-71 with mass 70.9247 amu and a natural abundance of 39.8%. Calculate the atomic mass of gallium.
Water is an amphoteric substance because it can receive and donate hydrogen ions.
- True
- False
Answer:
True
Explanation:
The answer is True...
Answer:
i think true
Explanation:
if right than tag me brilliant
how many distinct monochlorinated products can result when methylcyclohexane is subjected to free radical chlorination under UV light
Answer:
How many distinct monochlorinated products can result when methylcyclohexane is subjected to free radical chlorination under UV light.
Explanation:
Consider 1-methylcyclohexane:
Its structure is shown below:
It has primary [tex]1^o[/tex], secondary [tex]2^o[/tex]and tertiary [tex]3^o[/tex] carbons as shown in the image.
So, the following mono chlorinated product will be formed.
a que llamamos niveles y subniveles de energia?
Answer:
agua
Explanation:
por que estamos en la planeta
explain the chemical reaction
A chemical reaction is when reactants are converted into another substance (also called products). Their reaction rearranges the constituent atoms of the reactants to give different substances as products.
I hope this helps! Please mark me as brainliest!
Have a wonderful day!
Methane is the main component of natural gas. Using the given reaction enthalpy, calculate the heat energy produced by the combustion of one kilogram of methane.
Answer: The heat energy produced is 53831.25KJ
Explanation:
METHANE is the main component of natural gas. It can undergo combustion reaction in air with a bright blue flame to produce carbondioxide and water. The heat of reaction (enthalpy) is negative because heat is absorbed during the chemical reaction. To calculate the heat energy produced by the combustion of one kilogram (1 kg) of methane the following steps are taken:
Molecular mass of methane =16 gm/mol.
So moles of 1 kg methane =
Given mass of methane ÷ molecular weight of methane
But the given mass = 1kg = 1000g
Therefore,
moles of 1000g methane = 1000÷16
= 62.5 moles
Hence, energy evolved = (moles of methane) × (heat of combustion)
Therefore,
heat energy produced= 62.5 × (-861.3kj)
= -53831.25kj
The heat energy produced by the combustion of one kilogram of methane is –53831.25 KJ
We'll begin by calculating the number of mole in 1 Kg of CH₄
Mass of CH₄ = 1 kg = 1000 g
Molar mass of CH₄ = 12 + (4×1) = 16 g/mol
Mole of CH₄ =?Mole = mass /molar mass
Mole of CH₄ = 1000 / 16
Mole = 62.5 moles Finally, we shall determine the heat energy produced from the reaction.CH₄ + 2O₂ —> CO₂ + 2H₂O ΔH = –861.3 KJ
From the balanced equation above,
1 mole of CH₄ reacted to produce –861.3 KJ.
Therefore,
62.5 moles of CH₄ will react to produce = 62.5 × –861.3 = –53831.25 KJ
Thus, –53831.25 KJ of heat energy is produced.
Complete Question is located in the attached photo
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Atoms are:
O A. One of the 4 elements that matter is composed of.
B. Connected by bonds to form compounds.
OC. The basic building blocks of matter.
O D. Heterogeneous and refer to color, texture, and appearance.
Reset Selection
Answer:c
Explanation: atoms make matter
Atoms are the basic building blocks of matter. The correct option is C.
What are atoms?Atoms are the basic unit and building block of matter. They are the smallest unit, but they can be divided. They do not emit charge on dividing into the further, the smallest parts.
Atoms are further divided into electrons, protons, and neutrons. They are the charged particles that revolve in the shell of the atom. A nucleus is also present in the between of the atom.
Atoms are considered the building blocks of matter, as all matter is made up of many atoms. The configuration of the atom defines the state of matter.
Thus, the correct option is C. The basic building blocks of matter.
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Calculate the molarity of 198 g of barium iodide (Bal2) in 2.0 l of solution
Answer: The molarity of 198 g of barium iodide [tex](BaI_{2})[/tex] in 2.0 L of solution is 0.253 M.
Explanation:
Given: Mass = 198 g
Volume = 2.0 L
Molarity is the number of moles of solute present in liter of a solution.
Moles is the mass of a substance divided by its molar mass. So, moles of barium iodide (molar mass = 391.136 g/mol) is calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{198 g}{391.136 g/mol}\\= 0.506 mol[/tex]
Now, molarity is calculated as follows.
[tex]Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.506 mol}{2.0 L}\\= 0.253 M[/tex]
Thus, we can conclude that the molarity of 198 g of barium iodide [tex](BaI_{2})[/tex] in 2.0 L of solution is 0.253 M.