Cyclohexane can be manufactured from hexane as shown in the equation.
C6H14 C6H12 + H2
Calculate the mass of cyclohexane that can be made from 258 g of hexane.
[Mr
of cyclohexane = 84
Mr Hexane = 86 g/mol
mol hexane = 258 : 86 = 3
mol cyclohexane = mol hexane = 3
mass cyclohexane = 3 x 84 = 252 g
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what does this diagram show and what order is it in?
Answer:
Individual.
Explanation:
The diagram is showing how the biosphere is composed of, ending at ecosystem. Within an ecosystem, there is a community. Within a community, there are different populations. In one population, there are individuals that make it up.
So, since individuals make up a population, populations making up a community, and communities making up ecosystems, you find your Q to be individual.
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The complement system of defense is composed of proteins that are always present in the blood. Which statement describes the importance of this system in early pathogen defense?
It recognizes specific common pathogens.
It rapidly lower the blood pH.
It causes immediate pathogen lysis.
It does not have to be activated by antibodies.
Answer:
The answer is It recognizes specific common pathogens. :)
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Need help with predicting products
Na3PO4
+
ZnSO4
giving brainliest please help!
Answer:
I am sure it is the reaction will shift right towards the
product
24. When density decreases, the number of
molecules in a volume
A increases.
B decreases
C stays the same
D varies
what is the pH of a solution with a pOH of 3.23
Answer:
10.77
Explanation:
The relationship between pH and pOH is
pH + pOH = 14
Plugging in the pOH makes
pH + 3.23 = 14
And solving for pH by subtracting 3.23 on both sides
pH = 10.77
What makes an acid a strong acid in water makes a base or weak base
Acids or bases with strong bonds remain as molecules in solutions known as weak acids or bases. The acids or bases with weak bonds easily dissociate into ions and are called strong acids or bases.
What is acid or base?Acid is proton donor hydrogen containing substance. Base is proton acceptor molecule.
It can be predicted by pH indicator. pH with value less than 7 indicate acidity and value with more than 7 denotes base, and the one with value 7 is considered as neutral.
Thus, based on bond strength and its dissociation in the water makes it strong acid or weak base.
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which of the following is lewis acid a. Bacl. b.kcl c.Becl2 d.Licl
Answer:
becl2
Explanation:
because
a it has incomplete outer
b it accept electron pair
What is the molarity of a 250. mL H, SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution?
F) 0.800M
G)1.25M
H)125M
J)500. M
The molarity of a 250. mL H2SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution is 0.8M.
How to calculate molarity?The molarity of a solution can be calculated using the following expression:
CaVa = CbVb
Where;
Ca = concentration of acidCb = concentration of baseVa = volume of acidVb = volume of baseIn this question;
Ca = ?Va = 250mLCb = 10MVb = 20mLCa × 250 = 10 × 20
250Ca = 200
Ca = 200/250
Ca = 0.8M
Therefore, the molarity of a 250. mL H2SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution is 0.8M.
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Increasing the amplitude means you are increasing what of a wave?
Which sequence of coal rank is ordered from lowest to highest, based on the amount of organic carbon contained within:
The sequence of coal from lowest to highest based on organic carbon contained within is peat, lignite, sub-bituminous, bituminous, anthracite.
What is Coal?This is a fossil fuel which is usually black in color and a combustible sedimentary rock.
There are different types of coal with the amount of organic carbon contained within from lowest to highest being shown above.
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How many moles are contained in 39 L of F2 gas at STP?
The number of moles contained in 39 L of F2 gas at STP is 1.74mol. Details on how to calculate number of moles can be found below.
How to calculate number of moles?The number of moles of a gas at STP can be calculated using the following formula:
PV = nRT
Where;
P = pressureV = volume n = number of moles R = gas law constantT = temperatureAt STP, the following applies:
T = 273KP = 1 atmR = 0.0821 Latm/molK1 × 39 = n × 0.0821 × 273
39 = 22.41n
n = 1.74mol
Therefore, the number of moles contained in 39 L of F2 gas at STP is 1.74mol.
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how many miles of oxygen gas were used to produce 8.0 moles of water
Answer:
4 moles
Explanation:
Oxygen gas is O2 (two atoms of oxygen)
2 H2 + O2 = 2 H2 O
one mole of oxygen gas produces TWO moles of water
so you need 4 moles of O2 to produce 8 moles of water
what is the numerical value of gold silver and platinum?
Helium is an example
of a gas because
A. helium does not take the shape of its
container.
B. helium particles are very randomly spaced
and moving freely.
C. helium particles are electrically charged.
D. helium cannot change its size or shape to fit
its container
Answer:
B
Explanation:
The particles move freely
How many nickel atoms are contained in a 92.02 mole sample
Answer:
By definition, and this is what Avogadro's constant tells you, 1 mole of nickel must contain 6.022⋅1023 atoms of nickel.
Explanation:
In this performance task, students will analyze nutrition labels of some of
the foods and drinks that they recently consumed. They will identify which type of
macromolecule (carbohydrates, lipids, proteins) is mainly supplied by the item and they will
compare their consumption with the daily recommended intake for that type of
macromolecule. Students will also investigate salt and added sugar as well as vitamins and
minerals in the item. Finally, students will attach the nutritional labels in a short bond paper.
Explanation:
Globalization is the word used to describe the growing interdependence of the world's economies, cultures, and populations, brought about by cross-border trade in goods and services, technology, and flows of investment, people, and information
A mixture of heptane (bp 98oC) and 1-propanol (bp 97oC) is not fully resolved using SE-30 as the stationary phase, but is easily separated using a column of DEGS. Explain with your own words.
A mixture of heptane and 1-propanol easily dissolved using DEGS because diethylene glycol sussinate (C8H14O6) 1 propanol easily dilutes and retain surface.
What is mixture?Generally, a mixture speaks to the joining of two different substance in other to achieve a different substance or something combining or becoming matched.
In conclusion, SE-30 is neutral in nature, DEGs is a stationary phase containing a non-volatile liquid phase. It also includes polar group OH types,
Hence, using Hydrogen bonding it can easily bind 1-propanol.
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Can anyone help me please
Explanation:
The Animal meat contains Vitamins, proteins and carbohydrates and many more,
The other food group includes various minerals, (like copper, Calcium, Sodium, Phosphorus, selenium, cobalt, iron, zinc etc) various Amino acids, Fatty acids, water and albumin
The sources of vitamin like B12 are animals, and vegetarian should consume plant based supplements to fulfill the need of essential macromolecules!
[Side note: Meat consumption is secondary cause of increasing global warming Go vegan!]
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How are elements organized on the modern periodic table?.
Answer:
They are organized from least to greatest by their atomic number.
Explanation:
Hope that helps!
Answer:
Explanation:
Elements are listed in numerical order by atomic number. The atomic number is the number of protons in an atom of that element. So element number 1 (hydrogen) is the first element. Every atom of hydrogen has 1 proton. Until a new element is discovered, the last element on the table is element number 118. Every atom of element 118 has 118 protons. This is the biggest difference between today's periodic table and Mendeleev's periodic table. The original table organized the elements by increasing atomic weight.
Each horizontal row on the periodic table is called a period. There are seven periods on the periodic table. Elements in the same period all have the same electron ground state energy level. As you move from left to right across a period, elements transition from displaying metal characteristics toward nonmetallic properties.
Each vertical column on the periodic table is called a group. Elements belonging to one of the 18 groups will share similar properties. Atoms of each element within a group have the same number of electrons in their outermost electron shell. For example, elements of the halogen group all have a valence of -1 and are highly reactive.
There are two rows of elements found below the main body of the periodic table. They are placed there because there wasn't room to put them where they should go. These rows of elements, the lanthanides and actinides, are special transition metals. The top row goes with period 6, while the bottom row goes with period 7.
Each element has its tile or cell in the periodic table. The exact information given for the element varies, but there is always the atomic number, the symbol for the element, and the atomic weight. The element symbol is a shorthand notation that is either one capital letter or a capital letter and a lowercase letter. The exception is the elements at the very end of the periodic table, which have placeholder names (until they are officially discovered and named) and three-letter symbols.
The two main types of elements are metals and nonmetals. There are also elements with properties intermediate between metals and nonmetals. These elements are called metalloids or semimetals. Examples of groups of elements that are metals include alkali metals, alkaline earths, basic metals, and transition metals. Examples of groups of elements that are nonmetals are the nonmetals (of course), the halogens, and the noble gases.
What cell structure is best represented by the image?
A.
a permeable exoskeleton
B.
a waterproof nuclear envelope
C.
a non-permeable cell wall
D.
a selectively permeable membrane
A
Explanation:
What cell structure is best represented by the image?
A.
a permeable exoskeleton
B.
a waterproof nuclear envelope
C.
a non-permeable cell wall
D.
a selectively permeable membrane
The field of corn shown below was grown with 250 L/ha herbicide and no insecticide. Based what do you observe work what’s the resistance type of the corn?
A)None
B)Herbicide
C) Caterpillars
D) Caterpillars and herbicide
Based on the fact that only herbicide was used to grow the corn, this means that the resistance type of the corn are caterpillars.
What are herbicide and insecticide?Herbicide are chemicals used to control and kill weeds that could hinder crop production while insecticides are chemicals used to control insect pests.
According to this question, a field of corn was grown with 250 L/ha herbicide and no insecticide. This means that only herbs or weeds are being controlled on the field.
Therefore, it can be said that the corn plants are the type that are resistant to caterpillars, which are examples of insects.
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Solve
A gas occupies 9 L at a temperature of 325K. What is the volume at 450?
O 125L
ОЗК
O 302
O 87 L
The volume of a gas that occupies 9 L at a temperature of 325K is 12.46L.
How to calculate volume?The volume of a given gas can be calculated using the following Charle's law equation:
V1/T1 = V2/T2
Where;
T1 = initial temperatureT2 = final temperatureV1 = initial volumeV2 = final volumeV1 = 9LV2 = ?T1 = 325KT2 = 450K9/325 = V2/450
325V2 = 4050
V2 = 4050/325
V2 = 12.46L
Therefore, the volume of a gas that occupies 9 L at a temperature of 325K is 12.46L.
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If the temperature of a 50mL sample of a gas is changed from 200K to 400K under constant pressure, what is the new volume of the gas?
[tex] \text{V}_1 = 50 \text{ml }\\ \text{T}_1 = 200 \text{K} \\ \text{V}_2 = ? \\ \text{T}_2 = 400 \text{K}[/tex]
To find:-[tex] \text{The Value of V}_2[/tex]
Solution[tex]\frac{ \text{V}_1}{ \text{T}_1} = \frac{ \text{V}_2}{ \text{T}_2}[/tex]
[tex] \frac{50}{200} =\frac{ \text{V}_2}{400} \\ \\ \fbox{cross multiplying} \\ \\ \implies 200 \times V_2 = 50 \times 400 \\ \\ \implies V_2 = \frac{50 \times 400}{200} \\ \\ \implies V_2 = \frac{50 \times \cancel{ 400} { \: \: \: }^{2} }{ \cancel{200}} \\ \\ \implies V_2 = 50 \times 2 \\ \\ \implies V_2 = 100[/tex]
[tex] \therefore \implies V_2 = 100 \text{ml}[/tex]
Hope This Helps!!Please help me and thank you and need this before Monday
How many grams of sodium metal is required to react with 0.950 grams of chlorine gas?
In a reaction involving sodium metal and chlorine gas, the amount of sodium metal required to react with 0.950 grams of chlorine gas would be 0.62 grams
Stoichiometric calculationFrom the balanced equation of the reaction:
2Na (s) + Cl2 (g) ---------> 2NaCl (s)
The mole ratio of Na to Cl2 is 2:1.
Mole of 0.950 grams of chlorine gas = 0.950/70.906
= 0.0134 moles
Equivalent mole of Na = 0.0134 x 2 = 0.0268 moles
Mass of 0.0268 moles Na = 0.0268 x 22.99
= 0.62 grams
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explain how stalacitites and stalagmites are formed
As the redeposited minerals build up after countless water drops, a stalactite is formed. If the water that drops to the floor of the cave still has some dissolved calcite in it, it can deposit more dissolved calcite there, forming a stalagmite. Speleothems form at varying rates as calcite crystals build up. They are formed from condensation inside a cave, dripping off the ceiling.
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Write a chemical equation for the acid/base reaction that produces the salt potassium sulfate?
Answer:
KOH + H2SO4 --> K2SO4 + H2O
What is the brown liquid for that the grasshopper may “spit” out?
Answer:
It is called "tobacco juice"
Explanation:
When a grasshopper is picked up they spit the brownish liquid known as "tobacco juice." They use it as some sort of defense mechanism to protect them from attacks by predators.
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