Answer:
I did not understand the question
As a result of the interaction of 22 g of higher oxide of the element of the main subgroup of group IV with water, 31 g of acid was formed. Set the name of an unknown chemical element.
Answer:
Carbon (C)
Explanation:
Because the element is the element of the main subgroup of group IV , it has oxidation number +4 in the oxide, and oxide formula is EO2.
reaction:
EO2 + H2O ---> H2EO3
from reaction 1 mol 1 mol 1 mol
31 g acid - 22 g oxide = 9 g water
M(H2O) = 18 g/mol
9g * 1 mol/18 g = 0.5 mol H2O
As we see from reaction molar ratios EO2 : H2O : H2EO3 = 1 : 1 : 1,
so if we have 0.5 mol H2O , we also have 0.5 mol EO2.
0.5 mol EO2 has mass 22 g.
Molar mass(EO2) = mass/ number of moles = 22 g/ 0.5 mol = 44 g/mol
Molar mass (EO2) = M(E) + 2M(O) = 44 g/mol
M(E) + 2 *16 g/mol = 44 g/mo
M(E) = 44-32 = 12 g/mol
Molar mass 12 g/ mol is molar mass of carbon.
So, element is carbon (C).
What is the pH of a 3.50 x 10^-3 M NaOH solution
Answer:
11.54
Explanation:
-log(3.50*10^-3) = 2.46 pOH
pH = 14 - pOH
pH = 11.54
What is the mass of 13 gold atoms?
Answer:
uuuh 4.25191 × 10-21 grams????
Explanation:
does an oxygen atom form two covalent bonds?
Answer:
yes
Explanation:
Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell.
What mass of copper is consumed in the reaction with hydrochloric acid if 10.0 g of gas is collected?
Answer:
317 g
Explanation:
Cu + 2HCl --> CuCl2 +H2
1 : 2 1 : 1
1 mole of Cu = 63.5 g
1 mole of H2 = 2g
1 mole Cu produces = 1 mole of H2
63.5 g of Cu produces = 2 g of H2
So
10 g of H2 will be produced from = (63.5/2)*10 = 317 g of Copper
Plants absorb nutrients, help plants grow. Which level of organizqtion best describes this interaction between plants and soil? A) population B) organismos C) community D) ecosystem
Answer:
ecosystem
Explanation:
An ecosystem includes all of the living things (plants, animals and organisms) in a given area, interacting with each other, and also with their non-living environments (weather, earth, sun, soil, climate, atmosphere). The living and nonliving components of the ecosystem are linked together through nutrient cycles and energy flows. Ecosystems are of any size, but usually they are in particular places.
In an ecosystem, plants depend on the soil for nutrients. These nutrients are cycled in nature by the various biogeochemical cycles within the ecosystem. The ecosystem is a self sustaining unit in terms of materials and energy flow.
Answer:
D. ecosystem
Explanation:
An ecosystem is a large community of living organisms (plants, animals and microbes) in a particular area. The living and physical components are linked together through nutrient cycles and energy flows.
In an ecosystem there is symbiotic relationship which entails each living organism contributes to the well being of the other and the entire population.
Given the reaction:
NH3(g) + H2O() NH4+(aq) + OH–(aq)
Which is the conjugate acid-base pair?
A) H2O() and NH4+(aq)
B) H2O() and NH3(g)
C) NH3(g) and OH–(aq)
D) NH3(g) and NH4+(aq)
What is the molarity of a solution that is made by adding 57.3 g of MgO to 500.0 mL of solution?
Answer:
2.843 M
Explanation:
Molarity = moles / volume
Milliliters to liters:
500 mL = .500 L
Grams to moles:
MgO molar mass = 16.00 + 24.31 = 40.31 g/mol
57.3 g x 1 mol / 40.31 g = 1.421 mol
Molarity:
1.421 mol / .500 L = 2.843 M
What determines how fast a substance will dissolve
Answer:
(1) the surface area of the solute,
(2) the temperature of the solvent,
(3) the amount of agitation that occurs when the solute and the solvent are mixed.
Explanation:
Which of the following is a product found in the chemical equation below?
Answer: [tex]2H_2O[/tex] is a product found in the chemical equation
Explanation:
The given balanced chemical equation is as follows:
[tex]CH_3SH+4O_2\rightarrow CO_2+SO_2+2H_2O[/tex]
A chemical reaction is represented by writing the chemical formula of the reactants on the left side of the arrow and the products on the right side of the arrow.
Here 1 mole of [tex]CH_3SH[/tex] and 4 moles of [tex]O_2[/tex] are the reactants and 1 mole of [tex]CO_2[/tex] , 1 mole of [tex]SO_2[/tex] and 2 moles of [tex]H_2O[/tex] are the products.
Thus from the given options, [tex]2H_2O[/tex] are products
The rules of engagement (roe) working group is often used to _____. (select all that apply.)
Answer:
proactively develop ROE as well as responding to requests for additional ROE measures
Explanation:
The rules of engagement (roe) working group is a group who's main job is to proactively develop ROE as well as responding to requests for additional ROE measures. Rules of Engagement are a set or rules or directives for military soldiers that define the circumstances, conditions, degree, and manner in which the use of force can be used.
Define Kelvin's Temperature.
Answer:
Is an absolute temperature scale with zero at absolute zero
The solubility of a gas in water is 0.66 g/L at 15 kPa of pressure. What is the solubility when the pressure is increased to 40.0 kPa?
Answer:
The correct answer to the following question will be "1.76 g/L".
Explanation:
The given values are:
P₁ = 15 kPa
Solubility of water, C₁ = 0.66 g/L
P₂ = 40.0 kPa
C₂ = ?
Now,
According to Henry's Law,
⇒ [tex]\frac{P_{1}}{P_{2}}=\frac{C_{1}}{C_{2}}[/tex]
⇒ [tex]C_{2}=\frac{C_{1}\times P_{2}}{P_{1}}[/tex]
On putting the estimated values, we get
⇒ [tex]=\frac{0.66\times 40}{15}[/tex]
⇒ [tex]=\frac{26.4}{15}[/tex]
⇒ [tex]=1.76 \ g/L[/tex]
Explain how electron microscopy and scanning tunneling microscopes have contributed to the understanding of atoms.
Answer:
Electron microscopy and scanning tunneling microscopes contributed to the understanding of atoms in understanding atomic structure.
The electron microscope has magnifications of about 100,000x.
This helped the scientists to have accurate image groupings of the atoms. Scanning tunnel microscope helped scientists to have the images of groups of atoms.
Os etapas que devem sem compridas para obter separadamente os componentes (a as substâncias ) de uma mistura de água ,sal e areia ,são respectivamente : A) filtração e sifonação B) decantação e sifonação C) filtração e destilação simples D) catação e decantação
Answer:
The steps that must be long to obtain separately the components (to the substances) of a mixture of water, salt and sand, are respectively: A) filtration and siphoning B) decanting and siphoning C) simple filtration and distillation D) collection and decantation.
Simple filtration and Siphoning is the method. When an insoluble solid is present in a liquid. Filtration is the ideal method of separation,The sand is filtered by the filtered paper as water is allowed to pass through the filter paper into a beaker where the funnel which hold the filter paper emptied into.
Water molecules is Siphoned, pull by force of gravity through the sand, past the filter paper to emerge as clean in the beaker below.
Which ion is formed when an atom of fluorine (F) gains one electron
Answer:
fluoride ion
Explanation:
If atoms gain electrons, they become negative ions, or anions. Consider the example of fluorine (see Figure below). A fluorine atom has nine protons and nine electrons, so it is electrically neutral. If a fluorine atom gains an electron, it becomes a fluoride ion with an electric charge of -1.
hope that helps!
When a fluorine atom will gain electrons then it will form an anion,[tex]F^{-}[/tex].
What is anion?An ion having a negative charge, or one with more electrons than protons, is referred to as an anion. When an element acquires one or even more electrons, anion formation was observed.
What is an atom?The smallest component of ordinary stuff that makes up a chemical element is just an atom.
Atoms generate negative ions, or anions when they gain electrons. A fluorine atom is generally electrically neutral since it possesses nine protons as well as nine electrons. Gaining an electron causes a fluorine atom to will have to become a fluoride ion, which has an electric charge of such -1.
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What happens to the chemical structure of water when it changes states
Answer:
When water changes to a solid or gas, it's said that water changes to a different state of matter
Explanation:
Even when water physical form changes, the molecules stay the same. Water's molecules contains two hydrogen atoms that is bonded with one oxygen atom.
How do you know a physical change has occurred when evaporating water produces gaseous water?
A
A chemical change has resulted in a new substance.
B
A chemical change has resulted in a change of state.
C
A physical change has resulted in a phase change, not a change in composition.
Answer:
Its b its the state not anything else
A physical change has occurred has occurred when evaporating water producing gaseous water as a physical change results in a phase change, not a change in composition.
What is a physical change?
Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
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what is abbreviated structural formula of the 2-metil-5-isopropiloctan?
Answer:
CH3
|
CH3- C H -CH2-CH2- CH - CH2-CH2-CH3
|
CH
/ \
CH3 CH3
Explanation:
Octan
C-C-C-C-C-C-C-C
Metyl
CH3 -
Isopropyl
CH3
/
- CH
\
CH3
2-metil-5-isopropiloctan
CH3
|
CH3- C H -CH2-CH2- CH - CH2-CH2-CH3
|
CH
/ \
CH3 CH3
90 grams of glucose, C6H12O6, is dissolved in 2 liters of solution. Determine the molarity (M).
Answer:
0.25 M
Explanation:
The first step is to determine how many moles of glucose there are, which means first finding out the molar mass of glucose. Carbon has a molar mass of about 12, hydrogen 1, and oxygen 16, so the total molar mass of glucose is about 6(12)+12(1)+6(16)=180 grams. This means that 90 grams is half a mole. Half a mole of substance divided by two liters of solution is (1/2)/2=1/4, or a molarity of 0.25. Hope this helps!
What volume would 56.2 mL of gas at 820 mm of Hg occupy at 720 mm of Hg?
Answer:
49.35 mL
Explanation:
Given: 56.2 mL of gas
To find: volume that 56.2 mL of gas at 820 mm of Hg would occupy at 720 mm of Hg
Solution:
At 820 mm of Hg, volume of gas is 56.2 mL
At 1 mm of Hg, volume of gas is [tex]\frac{56.2}{820}[/tex]
At 720 mm of Hg, volume of gas is [tex]\frac{56.2}{820}(720)=49.35\,\,mL[/tex]
A quantity of Lithium reacts with sulfuric acid (H2SO4) to produce .10 g of hydrogen. How many grams of lithium are required ?
Answer:
0.35 g Li
Explanation:
H2SO4 + 2Li -> Li2SO4 + H2
7 g Li -> 2 g H2
x -> 0.10 g H2
x= (0.10 g H2 * 7 g Li)/ 2 g H2 x= 0.35 g Li
El champú ¿es de naturaleza básica o acida? ¿Como puedes saberlo?
Answer:
Is the shampoo basic or acidic in nature? How can you know?
The shampoo by nature is of basic pH.
Explanation:
Since the basic shampoo weakens the hair by breaking the disulfide bonds of the keratin of the hair, it is sought to slightly acidify adding small flakes of various materials, for example, glycol distearate.
The shampoos hardly have the pH indicated, the most common is to see shampoo with balanced or neutral pH (pH 7). To know the pH of the shampoo you can buy pH measuring strips. A pH between 5.5 and 7 is correct.
If I initially have a gas at a pressure of 12 atm, a volume of 23 Liters and a temperature of 200K, and then I raise the pressure to 14 atm and increase the temperature to 300K, what is the new volume?
Answer:
The new volume of the gas is 29.57 Liters
Explanation:
Given;
initial pressure of gas, P₁ = 12 atm
initial volume of gas, V₁ = 23 Liters
initial temperature of gas, T₁ = 200 K
final pressure of gas, P₂ = 14 atm
final temperature of gas, T₂ = 300 K
final volume of gas, V₂ = ?
To determine the final volume of the gas, we apply general gas law;
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\V_2 = \frac{P_1V_1T_2}{T_1P_2}\\\\V_2 = \frac{12*23*300}{200*14}\\\\V_2 = 29.57 \ Liters[/tex]
Therefore, the new volume of the gas is 29.57 Liters
What is work?
O A. Force times an object's displacement
B. The distance an object moves over time
C. The time it takes an object to move a certain distance
D. The force that distance makes
SUBMIT
Answer:
A:force times an object displacement
Explanation:
Given 700 ml of oxygen at 7 ºC and 106.6 kPa pressure, what volume does it take at 27ºC and 66.6 kPa pressure
Answer:
The volume is 1.2L
Explanation:
Initial volume (V1) = 700mL = 0.7L
Initial temperature (T1) = 7°C = (7 + 273.15)K = 280.15K
Initial pressure = 106.6kPa = 106600Pa
Final temperature (T2) = 27°C = (27 + 273.15)K = 300.15K
Final pressure (P2) = 66.6kPa = 66600Pa
Final volume (V2) = ?
To solve this question, we need to use combined gas equation which is a combination of Boyle's law, Charles Law and pressure law.
(P1 × V1) / T1 = (P2 × V2) / T2
solve for V2 by making it the subject of formula,
P1 × V1 × T2 = P2 × V2 × T1
V2 = (P1 × V1 × T2) / (P2 × T1)
V2 = (106600 × 0.7 × 300.15) / (66600 × 280.15)
V2 = 22397193 / 18657990
V2 = 1.2L
The final volume of the gas is 1.2L
NEED ASAP WILL MARK BRAINLIEST ON TIMER
hi A student determines that she used 0.0665 mol of sodium hydroxide (NaOH) to completely titrate 25.00 mL of sulfuric acid solution (H2SO4). What is the molarity of the sulfuric acid?
0.00131 M
0.00262 M
1.31 M
2.62 M
Answer:
The answer is 2.660 mol/l
Explanation:
Given: n= 0.0665, v= 25.00ml
Required: C
C (molarity)= n (of solute)/ v (of solvent) [ standard unit: mol/l]
First convert volume of solvent in its standard unit, i.e. litres(L)
v= 25.00ml/1000= 0.02500L
C = 0.0665 mol / 0.02500 L= 2.660 mL (In proper significant digits i.e. 4 sigdigs)
Therefore, The molarity of the sulfuric acid is 2.660 mol/L :)
during a nuclear reaction, what is mass converted into?
Answer:
The mass is converted to energy to cause the mushroom cloud you woud see
Explanation:
Why can chemical energy and nuclear energy be considered potential energy
Answer:
Chemical potential energy is a form of potential energy related to the structural arrangement of atoms or molecules. This arrangement may be the result of chemical bonds within a molecule or otherwise. Chemical energy of a chemical substance can be transformed to other forms of energy by a chemical reaction.
The chemical energy and nuclear energy can be considered potential energy because both of them has energy stored in it.
What is potential energy?Potential energy is any form of energy that has stored potential that can be put to future use such as nuclear energy, chemical energy in which the energy is stored in it so we can conclude that chemical energy and nuclear energy can be considered potential energy due to its storage of energy.
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The biceps brachii is the muscle that moves the arm up and down.
Which type of muscle tissue makes up the biceps?
smooth
skeletal
nonstrated
cardiac
Answer:
The skeletal muscle tissue is found in biceps.
=> Option B is correct
Hope this helps!
:)
There are different types of muscles namely smooth muscles, skeletal muscles, non-striated muscles etc. Biceps brachii is classified as skeletal muscles.
What are skeletal muscles?Skeletal muscles are controlled by the somatic nervous system and are voluntary muscles. The other types of muscle include smooth muscle, which is non-striated, and cardiac muscle, both of which are striated. These two types are both considered to be involuntary, or under the direction of the autonomic nervous system.
The biceps brachii commonly know as the biceps, is a large, thick muscle on the ventral portion of the upper arm. The muscle is composed of a short head and a long head. The long head is located on the lateral side of the biceps brachii while the short head is located on the medial side[1].
The biceps brachii works across three joints, and is able to generate movements in glenohumeral, elbow and radio-ulnar joints.
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