Answer:
The elements in the alkaline earth metals group; beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra), have two electrons in their outer electronic shell.
Explanation:
The alkaline earth metals consisted of 5 shells have been beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
The alkali earth metal has been the element of group 2. The elements have consisted of the 2 valence electrons.
The electrons in the elements have been assigned the electron address based on the capacity of the shells to occupy electrons.
The electrons have been filled based on the energy level of the shells.
The order of the increasing energy level has been:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s.
The elements with the occupied 4p shells will have the 5 shells.
The elements in group 2 consisted of 5 shells have been beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
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An oxide of iron is found to be 77. 75% iron by mass. Determine the empirical formula for this compound and name it.
The empirical formula of oxide of iron is Fe2O2 and its name is iron oxide.
Given:
Percentage of iron by mass = 77. 75 %Molar mass of iron = 55.85Percentage of oxygen by mass = 22.25 %Molar mass of oxygen =16Solution:
Now, calculate the relative mass of iron in iron oxide = Percentage of iron by mass / At. mass of iron
Relative mass of iron = 77.75/55.85 = 1.39
Relative mass of oxygen = Percentage of oxygen by mass / At. mass of iron = 22.25/16 = 1.39
Now the calculate the molar ratio of iron to oxygen = 1.39 : 1.39 = 2:2
Thus, the empirical formula of iron oxide is Fe2O2 and its name is iron oxide.
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A consequence of burning fossil fuels is
warming.
How far will a bug crawl if it goes for 20
seconds at 15m/s?
Answer:
300 m
Explanation:
Answer:
300
Explanation:
20x15=300
i know that someone else already got this i just showed the work
Using the geologic concept of plate boundaries, compare and contrast the formation of the Andes Mountains,
Himalayan Mountains, the islands of Japan, Iceland, and the San Andreas area of California. Compare ( how are they alike) and Compare (how are they different)
Answer:
Oo Japan. I love japan it’s so pretty and I wish I could go there, it’s my dream place to visit!
Explanation:
Can someone please please help me with the first two !!!! I really need to turn this in !!!!!
Answer:
Be Electron configuration: 1s2 2s2
Be Orbital Diagram: \//\ \//\ (it would be little arrows going up and down to show the spins)
F Electron Configuration: 1s2 2s2 2p5
F Orbital Diagram: \//\ \//\ \//\ \//\ \/
Sodium and chlorine combine to form sodium chloride, or table salt. Sodium and chlorine are:
A: Producers
B: Products
C: Reactionaries
D: Reactants
A chemical reaction is the combination of two or more elements or compounds to form one or more products. The combining compounds or elements are called reactants. Hence, sodium and chlorine are reactants. Thus option D is correct.
What is a chemical reaction?A chemical reaction is a change in the chemical composition that occurs when two or more species unite to create a new product by forming or breaking chemical bonds.
The reactants are the organisms that are reacting. In a reaction's chemical equation, they are shown on the left side. The right side of the arrow is where the products are shown.
Consider the reaction of sodium and chlorine to give NaCl.
Na + Cl ⇒ NaCl.
NaCl is the product in this reaction. Na and Cl are the reactants. Hence, option D is correct.
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HURRY ! Kumar is producing the photoelectric effect by using red light. He wants to increase the energy of emitted electrons. Based on the research of Albert Einstein, what is the best way for him to do this? Increase the intensity of red light. Decrease the intensity of red light. Use a different colored light that has a higher frequency. Use a different colored light that has a lower frequency.
Answer:
using a diffrent colored light with a higher frequency
Explanation:
Can someone help me please?
Answer:
D. 10mm = 1 cm
E. 1000m = 1mm
G. 100 cm = 1 m
H. 1 m = 10 dm
when liquid water changes into solid ice, it increases in ?
when liquid water changes into solid ice, it increases in mass
Sebastian watches his cat run out Into the yard, look at a bug, and then run back to the
house.
Between which two points is the cat's Motion showing No Motion?
The Cat's Position vs. Time
Position
G
Time
A. Points A to B
B. Points B to C
C. Points C to D
D. Points D to E
Answer:
I think its A
Explanation:
what reaction type is the followong reaction
Answer:
its the fourth one please mark as brainlest
Explanation:
25.00 grams of sodium chloride reacts with an excess
hydrochloric acid and sodium sulfate. What weight of HCl is produced?
Mass of HCl produced :15.59 g
Further explanationReaction
2NaCl + H₂SO₄ → 2HCl + Na₂SO₄
Excess = H₂SO₄
Limiting = NaCl
mass NaCl = 25 g
mol NaCl(MW=58.5 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{25}{58.5}=0.427[/tex]
From the equation, mol ratio NaCl : HCl = 2 : 2, so mol HCl = mol NaCl =0.427
Mass of HCl(MW=36.5 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=0.427\times 36.5\\\\mass=15.59~g[/tex]
The half life of a radioactive element is 20 days. How many days will it take for the radioactive sample to decay to 1/8 its size?
Answer: 40 days
Explanation: The substance completely disintegrates in 20 days the substance completely disintegrates in 40 days 1/8 part of the mass of the substance will be left intact at the end of 40 days.
n‑methyl‑2‑pyrrolidone is an aprotic solvent used in many industrial processes. draw the structure of the product formed when it is heated with aqueous acid. n methyl 2 pyrrolidone is a 5 membered ring consisting of 4 carbons and one nitrogen. the nitrogen is bonded to a methyl group. the carbon next to the methyl group is double bonded to an oxygen atom. this reacts with h plus, water and heat.
N-methyl-2-pyrrolidone is a very reactive compound. It reacts in an acidic medium to form a variety of products. Some reactions involve the ring-opening step.
The structure of N-methyl-2-pyrrolidone is given below:
The compound has a five-membered ring, which consists of four carbon atoms and one nitrogen atom. The ring has one oxygen attached to it via the double bond, and one methyl group is attached to the nitrogen atom.
The chemical reaction involved is as follows:
The structure of the product is given below:
N-methyl-2-pyrrolidone on reaction with strong aqueous acidic medium followed by the treatment of heat results in the opening of the ring and forms a compound having a carboxylic group at one end and protonated nitrogen atom which has one methyl group attached to it, at another end
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I have two beakers (A & B) containing clear liquids. The first one (A) holds 75g and after being analyzed proves to contain 4.425g of hydrogen and 70.575g of oxygen. The second beaker (B) holds 125g and analysis shows that it is composed of 7.38g of hydrogen and 117.6g of oxygen.
Answer:
The solutions are most likely hydrogen peroxide since it is the compound of hydrogen and oxygen that has a ratio of Hydrogen to Oxygen ratio of 1 : 1.
Note:The question is not complete.
Explanation:
The empirical formula of the two compounds are determined
Solution in beaker A:
Mass of Hydrogen = 4.425 g
Moles of hydrogen = reacting mass/molar mass = 4.425 g / 1 g/mol = 4.425 moles
Mass of oxygen = 70.575 g
Moles of oxygen = reacting mass/molar mass = 70.575 g / 16 g/mol= 4.411 moles
Mole ratio of Hydrogen to Oxygen = 4.425 : 4.411
Simplest mole ratio = 1 : 1
Therefore, empirical formula of solution in A = H₁O₁
Solution in beaker B:
Mass of Hydrogen = 7.38 g
Moles of hydrogen = reacting mass/molar mass = 7.38 g / 1 g/mol = 7.38 moles
Mass of oxygen = 117.6 g
Moles of oxygen = reacting mass/molar mass = 117.6 g / 16 g/mol= 7.35 moles
Mole ratio of Hydrogen to Oxygen = 7.38 : 7.35
Simplest mole ratio = 1 : 1
Therefore, empirical formula of solution in B = H₁O₁
The solutions in beakers A and B have the same empirical formula. Their molecular masses are not given, so their molecular formula is not certain. However, the solutions are most likely hydrogen peroxide since it is the compound of hydrogen and oxygen that has a ratio of Hydrogen to Oxygen ratio of 1 : 1.
Elements eventually combine to make compounds, which statement is true
about compounds?
a) The compound formed is different both physically and chemically
compared to the elements that formed it
b) Compounds require lots of energy to be formed and to be separated
c) Compounds are easy to identify by their chemical formula ex. C6H12O6
d) All of the above
The statement that is true about compounds is that
the compound formed is different both physically and chemically compared to the elements that formed it, Compounds require lots of energy to be formed and to be separated and Compounds are easy to identify by their chemical formula. That is option D.
What are chemical compounds?Chemical compounds are chemical substances that are made up of elements which are chemically combined together.
The combination of these elements leads to the formation of new chemical bonds making the newly formed chemical compounds different from the elements that formed it.
During the formation of these chemical compounds, bonds are being broken while other bonds are being formed to make a different chemical compounds.
The energy that is always required to breaks the chemical bond is called the bond energy.
To be able to identify a chemical compound, a chemical formula is being used for example, C6H12O6 is the chemical formula for glucose chemical compound.
Therefore, the statement that is correct concerning a chemical compound include the following:
The compound formed is different both physically and chemically compared to the elements that formed it.Compounds require lots of energy to be formed and to be separated. Compounds are easy to identify by their chemical formula.Learn more about elements here:
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If you travel 10 miles in 5 minutes, what is your speed
Answer: 120 mph or 2 mpm
Explanation: 60/5= 12
12*10=120mph
Going 10 miles in 5 minutes means you would be able to go 20 miles in 10 minutes. You would have a total of 12 five minute blocks at 10 miles each. 60 miles in 30 minutes or 120 in 60 minutes.
Or 10 miles in 5 minutes would be 2 miles in 1 minute. (10/5=2)
An object has a momentum of 5 kg m/s and a mass of 2 kg. How fast is it moving?
Answer:
2.5 meter per second
Explanation:
momentum = mass multiplied by velocity
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If a sample of ammonia contains 19.0 g of H, how many grams of N does it contain? Express your answer in grams of nitrogen to two significant figures.
Please help me. Thank you
The mass of the nitrogen atoms in ammonia is 6.33 g.
How many moles of nitrogen are present?We know that ammonia is made up of nitrogen and hydrogen and hydrogen. There is one mole of nitrogen and three moles of hydrogen in a mole of ammonia.
Since the ratio of the atoms of hydrogen to nitrogen is 3:1, the ratio of the masses of the atoms is; 1/3 = x/19
x = 6.33 g
The mass of the nitrogen atoms in ammonia is 6.33 g.
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According to Newton's Second Law of Motion, if the force acting on ar
object stays the same, but the mass of an object increases, then
acceleration will...
A. increase
B. decrease
C. remain the same
D. completely stop
Answer:
B
Explanation:
Because the mass of an object increases, then the acceleration will decrease
Iron(III) oxide is formed when iron combines with oxygen in the air.
How many grams of Fe203 are formed when 6.7 g of Fe reacts completely with oxygen?
Fe + 02 --> Fe203 (unbalanced equation)
Answer:
Mass = 9.58 g
Explanation:
Given data:
Mass of Fe₂O₃ formed = ?
Mass of Fe = 6.7 g
Solution:
Chemical equation:
4Fe + 3O₂ → 2Fe₂O₃
Number of moles of Fe:
Number of moles = mass/molar mass
Number of moles = 6.7 g/ 55.8 g/mol
Number of moles = 0.12 mol
now we will compare the moles of Fe and Fe₂O₃.
Fe : Fe₂O₃
4 : 2
0.12 : 2/4×0.12 = 0.06 mol
Mass of Fe₂O₃:
Mass = number of moles × molar mass
Mass = 0.06 mol × 159.69 g/mol
Mass = 9.58 g
How many moles in 28 grams of CO₂?
Answer:
I think the answer Is 0.636 mol of CO2!
ill mark brainliest plz help
Answer:
option d
Explanation:
please mark me brainliest
Answer: S₅Br₆
Explanation: The prefix “penta-“ means five, and the prefix “hexa-“ means six.
. For the reaction 2HNO3 + Mg(OH), → Mg(NO3)2 + 2H20, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO,?
Mass of Magnesium nitrate produced : 593.2 g
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
2HNO₃ + Mg(OH)₂ → Mg(NO₃)₂ + 2H₂0
mol HNO₃ = 8
From the equation, mol ratio of HNO₃ : Mg(NO₃)₂ = 2 : 1, so mol Mg(NO₃)₂ :
[tex]\tt \dfrac{1}{2}\times 8=4~moles[/tex]
Mass Mg(NO₃)₂(MW=148,3 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=4\times 148,3 g/mol\\\\mass=593.2~g[/tex]
......Please help.....
Answer:
A
Explanation:
The element represented by [Xe]6s' is
Answer: is Cesium (Cs)
a solution of 5 m hcl is already made. you need to dilute the solution to 1 m hcl. the 1 m hcl solution is . slower
"A solution of 5 M HCl is already made. You need to dilute the solution to 1 M HCl. The 1 M HCl solution is less concentrated." Thus, option b is correct.
What is molar concentration?Molar concentration has been the molarity of the solution that measures the amount of the solute present in the liter solution. It describes the solute concentration that depends on the volume.
The dilution of the solution by increasing the volume results in a decrease in the concentration as molarity and volume show an inverse relationship. So, 1 M is less concentrated than 5 M solution.
Therefore, option b. less concentrated is the correct blank.
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Your question is incomplete, but most probably your full question was, A solution of 5 M HCl is already made. You need to dilute the solution to 1 M HCl. The 1 M HCl solution is ____________.
a. more concentrated
b. less concentrated
c. neither
d. both less and more concentrated
linalyl acetate (bergamot oil): C , 73.41 % ; H , 10.29 % ; O , 16.30 %
Express your answer as a chemical formula.
Empirical formula tells us the relative ratios of different atoms in a compound.
The chemical formula for a compound obtained by composition analysis is always the empirical formula.
How to calculate Empirical formula:
First, try to write the details, like in a tabular formThen, write the given percentage of the elements under themDivide the given % with the atomic mass of the respective elementsAfter getting the values, divide those values with the least value from among them to get a simplest whole numberLinalyl acetate (bergamot oil):
Carbon Hydrogen Oxygen
73.41 % 10.29 % 16.30 %
73.41 / 12 10.29 / 1 16.30 / 16
6.11 10.29 1.01
6.11 / 1.01 10.29 / 1.01 1.01 / 1.01
6 10 1
Empirical formula : C₆H₁₀O
Thus we can conclude that empirical formula of linalyl acetate is C₆H₁₀O
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The empirical formula for Linalyl acetate expresses the relative proportions of different atoms in a compound.
What exactly is Linalyl acetate?Linalyl acetate is a phytochemical found in a variety of flowers and spice plants. It is an important component of bergamot and lavender essential oils. It is the linalool acetate ester, and the two are frequently found together.
Linalyl acetate, the primary constituent of lavender oil, is a fragrance chemical commonly found in scented products.Linalyl acetate has very low acute toxicity in mammals; the acute oral LD50 exceeds 13,360 mg/kg, and the inhalation LC50 exceeds 2740 mg/m3. Linalyl acetate causes no or very little irritation in humans. There is no information available about possible eye irritation.Linalyl acetate occurs naturally in organisms such as Xylopia aromatic, Citrus tankan, and others for which data is available.Linalyl acetate is safe as a fragrance material at current concentrations.A food additive is used to improve the flavor or odor of food.A substance that kills or slows the growth of microorganisms like bacteria, viruses, fungi, and protozoans.Hence, the empirical formula describes the relative proportions of different atoms in a compound. The chemical formula for a compound obtained through composition analysis is always the empirical formula.
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5) In two paragraphs, explain your own personal views on how you and humans as a whole are connected to the environment. Be sure to explain how you think your culture, family, or upbringing has played a part in the development of these views
please help me
The environment is indispensable in the molding of humans from pre historic times.
How are we connected to the environment?The term environment has to do with the surroundings of man. It is the area that surrounds man. Man is shaped by his environment because it has a profound influence on how man reasons and behaves.
In Psychology, the nature - nurture controversy has been a big subject of debate. This theory holds that the environment in which a person was born has a profound influence on the attitudes and perceptions of the individual.
This has held true in so many instances for instance, the faiths that we profess for most of our lives is the result of the religious upbringing that we received in the earlier years of life.
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All bonds in alkanes, alkenes, and alkynes can freely rotate at room temperature. True or false?.
The statement that all bonds in alkanes, alkenes, and alkynes can freely rotate at room temperature is false.
Alkanes are saturated hydrocarbons with single covalent bonds. All bond in alkanes can freely rotate.
For example, propane is a three carbon alkane (acyclic saturated hydrocarbon).
Chemical formula for the molecule of propane is CH₃-CH₂-CH₃.
Alkenes and alkynes are unsaturated hydrocarbons. Alkenes have one double bond between carbon atoms, while alkynes have one triple bond between carbon atoms. There is no free rotation in double and triple bonds.
R₂C=CR₂ is general formula for the alkenes.
R–C≡C–R is general formula for the alkynes.
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