Answer:
Ions result from atoms or molecules that have gained or lost one or more valence electrons, giving them a positive or negative charge.
Explanation:
Those with a negative charge are called anions and those with a positive charge are called cations. ... It has more electrons than protons, resulting in the negative charge. hope this helps you :)
0.70 g of hydrogen chloride (HCl) is dissolved in water to make 5.0 L of solution. What is the pH of the resulting hydrochloric acid solution? Express the pH numerically to two decimal places.
Answer:
( About ) 2.42 pH
Explanation:
First convert grams to mole of the hydrochloric acid,
HCl ( moles ) = 0.7g * ( 1 mole / 36.5g ),
0.7 / 36.5 = ( About ) 0.0192 moles
Now take the moles as a fraction over the given liters, to determine " M, " the apparent pH
M = 0.0192 mole / 5.0 L,
M = 0.00384M
_________________________________________________
Because HCl is a strong acid and will completely ionized, take a look at the steps below,
[ H+ ] = 0.00384M pH = -log[H+] = - log[0.00384],
- log[0.00384] = - ( - 2.41566... )
Solution = ( About ) 2.42 pH
The pH of the resulting hydrochloric acid solution will be 2.42 pH
What is pH?"pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution". pH is the scale marks from 1 to 12. The substance above 7 are acidic and vice versa.
Given the mass of HCl is 0.70 g
The volume of the solution is 5.0 L
First, converting the grams to moles of the hydrochloric acid,
moles of HCl = 0.7g x 1 mole / 36.5g
0.7 / 36.5 = 0.0192 moles
Now take the moles as a fraction over the given liters, to determine " M, " the apparent pH
M = 0.0192 mole / 5.0 L,
M = 0.00384M
Because HCl is a strong acid and will be completely ionized, take a look at the steps below,
[ H+ ] = 0.00384M pH = -log[H+] = - log[0.00384]
- log[0.00384] = - - 2.41566.
Thus, the pH will be 2.42 pH.
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HELP ASAP! PLEASE PLEASE PLEASE Suppose a reaction begins with 54 molecules of B2 and 126 molecules of A2 which react as completely as possible according to the equation B2 + 3 A2 --> 2 BA3. How many B2 molecules will be present in the container at the end of the reaction?
Answer:
Explanation:
For one B2 molecule 3 A2 molecules are reacting means,
the ratio is 1:3
Out of 126 molecule = 126/3 =42 molecules are required for the reaction,
therefore the 54-42= 10 molcules of B2 will reamin in the end of reaction.
What temperature scale has zero as its lowest temperature? A. The Celsius scale B. The average atomic mass scale C. The Kelvin scale D. The Fahrenheit scale
Answer:
Kelvin Scale
Explanation:
As in Kelvin scale 0 is absolute zero temprature and in celcius scale it calculates -273.15 'Celcius
The Temperature scale has zero as its lowest temperature is The Kelvin Scale Hence , Option (C) is correct.
What is Kelvin Scale ?
The kelvin, symbol K, is the SI base unit of temperature, named after the Belfast-born and University of Glasgow based engineer and physicist William Thomson, 1st Baron Kelvin.
The Kelvin scale is an absolute thermodynamic temperature scale, meaning it uses absolute zero as its null point.
Therefore , The Temperature scale has zero as its lowest temperature is The Kelvin Scale Hence , Option (C) is correct.
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Determine the name for P4010.
Answer:
Technically, the name for P4o10 is Tetraphosphorus Decaoxide, but most people call it Phosphorus Pentoxide
Explanation:
Tetraphosphorus Decaoxide is a chemical compound. The molecular formula for this compound is P4o10. But, under normal conditions, it is actually a dimer of P205, which is Phosphorus (V) Oxide, or Phosphorus Pentoxide.
To solve this we must be knowing each and every concept related to chemical compound. Therefore, the name for P[tex]_4[/tex]O[tex]_{10}[/tex]. is Tetra phosphorus Deca oxide.
What is chemical compound?A chemical substance was made up of numerous comparable molecules that are made up of atoms from multiple elements that are held together through chemical bonds. Compounds are classified into four types based on the way the component elements are kept together.
A chemical formula is a method of communicating information about the atom components that make up a specific chemical compound, using conventional acronyms again for chemical elements and subscripts to express the atomic mass involved. The name for P[tex]_4[/tex]O[tex]_{10}[/tex]. is Tetra phosphorus Deca oxide.
Therefore, the name for P[tex]_4[/tex]O[tex]_{10}[/tex]. is Tetra phosphorus Deca oxide.
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scientist cant look inside an atom So how did they discover sub-atomic particles
Answer:
Subatomic particles are found inside the atom
18. How are ionic compounds formed?
A)Atoms share electrons.
B)Elements change into different elements.
C)Atoms gain/lose electrons and are held together by electrostatic forces.
D)Atoms share protons.
Answer:
C
Explanation:
Ionic compounds consist of ions, which are formed when elements gain or lose electrons through donating or receiving.
Ionic compounds are formed by atoms that gain/lose electrons and are held together by electrostatic forces. The correct option is C).
What are ionic compounds?Ions are charged particles that occur when an atom (or group of atoms) receives or loses electrons. Ionic compounds are substances made of ions. (A positively charged ion is a cation, whereas a negatively charged ion is an anion.)
When elements share electrons in a covalent connection to create molecules, they produce covalent or molecular compounds.
Chemical compounds include ionic compounds. They were held together by the ionic chemicals from which they were produced.
A marginally soluble ionic substance loses some of its solubility when a common ion is added to a solution because: Reaction to the ionization process known as the common ion effect
Therefore, the correct option is C) Atoms gain/lose electrons and are held together by electrostatic forces.
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If “light A” has a longer wavelength than "light B”, then “light A” has
“light B”.
Answer: light A has less energy than light B
Explanation: The longer wavelength the less energy. The shorter wavelength the more energy.
A/An ___ is an area where grounded ater naturally comes to the earth's surface.
Answer:
A Spring is an area where groundwater naturally comes to the earth's surface.
Explanation:
hope this helps :)
What is the name of this molecule? A. 4-hexyne B. 2-hexyne C. 3-hexyne D. 1-hexyne
Answer:
3 hexyne
Explanation:
The correct name of the compound can be written by the IUPAC system as 3-hexyne.
What is IUPAC nomenclature?IUPAC is the acronymn for the international Union of Pure and Applied Chemisty. This body is responsible for devising the conventions of namiong compounds such that the name of the compound could be deduced from its structure.
In this case, the correct name of the compound can be written by the IUPAC system as 3-hexyne.
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Consider the reaction 2AI(OH)3 + 3H2SO4 Right arrow. X + 6Y. What are X and Y? X = AI2(SO4)3; Y = H2O X = AI2(SO4)3; Y = H2 X = AI2(SO3)3; Y = H2O X = AI2(SO3)3; Y = H2
Answer :
X = [tex]Al_2(SO_4)_3[/tex]
Y = [tex]H_2O[/tex]
Explanation :
Balanced chemical equation : It is defined as the equation in which total number of individual atoms on the reactant side is equal to the total number of individual atoms on product side.
The given chemical equation is:
[tex]2Al(OH)_3+3H_2SO_4\rightarrow X+6Y[/tex]
As we know that when aluminum hydroxide react with sulfuric acid then it gives aluminum sulfate and water as product.
The balanced chemical reaction will be:
[tex]2Al(OH)_3+3H_2SO_4\rightarrow Al_2(SO_4)_3+6H_2O[/tex]
Thus, X is [tex]Al_2(SO_4)_3[/tex] and Y is [tex]H_2O[/tex]
Answer:
a
Explanation:
Question 25———-A, YA are two isotopes of element A.
Difference between the number of neutrons
in the isotopes is?
Answer:
Option C. 1
Explanation:
Step 1:
Determination of the Neutron of both isotopes. This is illustrated below.
For isotope y xA:
Mass number = y
Atomic number = x
Neutron =..?
Atomic number = proton number = x
Mass number = Proton + Neutron
y = x + Neutron
Rearrange
Neutron = y – x
For isotope (y + 1) xA:
Mass number = y + 1
Atomic number = x
Neutron =.?
Atomic number = proton number = x
Mass number = Proton + Neutron
y + 1 = x + Neutron
Rearrange
Neutron = y + 1 – x
Step 2:
Determination of the difference between the neutron number of both isotopes. This is illustrated below:
For isotope y xA:
Neutron number = y – x
For isotope (y + 1) xA:
Neutron number = y + 1 – x
Difference in neutron number
=> (y + 1 – x) – (y – x)
=> y + 1 – x – y + x
Rearrange
=> y – y + 1 – x + x
=> 1
Therefore, the difference in the neutron number of both isotopes is 1
If a reaction taking place in a flask shows a drop in temperature, which type of reaction is it? Options: exothermic reactions endothermic reactions
Answer:
exothermic reaction
Explanation:
If there is a drop in temperature, then energy was lost to the surroundings because temperature is the average measure of kinetic energy. An exothermic reaction would result in this lost of energy. An endothermic reaction would absorb energy and make the temperature rise.
Answer:
Endothermic
Explanation:
Exothermic means giving out of energy/heat and the taking in of energy/heat means endothermic reaction.
Write the formula of the ion formed when Aluminum reacts by losing electrons
Answer:
If alluminium loses 1 electron Al+
If it loses 2 electrons Al++
Explanation:
You have left the carton of milk out of the refrigerator overnight and it has
spoiled. This is an example of a
A. Physical property
O
B. Physical change
OC. Chemical property
D. Chemical change
Reset Selection
Answer:
D: chemical change
Explanation:
Which of these is an example of an engineering solution?
O
A. Studying the diets of people with autoimmune diseases.
B. Creating a biodegradable trash bag.
C. Figuring out how long it takes plastic to degrade in a landfill.
D. Studying new species of insects in the Costa Rican jungles.
ASAP!!!
Answer:
B. Creating a biodegradable trash bag.
Explanation:
Engineering is generally defined as the use of scientific principles to design or build structures such as buildings, bridges and vehicles.
Engineering is the application of science or math to solve our daily life problems. So, creating a biodegradable trash bag is an example of an engineering solution which solve the environmental-related issues.
Hence, the correct option is B.
21. Which type of reaction is shown below?
BaCl2(aq) + K2CO3(aq) → BaCO3(s) + 2 KCl(aq)
A)Decomposition
B)Double replacement
C)Single replacement
D)Combustion
To solve such this we must know the concept of double displacement reaction. The correct option is option B that is double displacement reaction.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
In double displacement reaction the two compounds react with each other. The cations of each compound exchange their places with ne another. Ba²⁺ of BaCl[tex]_2[/tex] is displacing K⁺ ion from the compound K[tex]_2[/tex]CO[tex]_3[/tex].
Therefore the correct option is option B that is double displacement reaction.
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One meter is equal to 10 9 nanometers. How long in meters is 670 nanometers? 6.70 × 10 –7 m 6.70 × 10 –9 m 6.70 × 10 9 m 6.70 × 10 –11 m
Answer:
10^9 nanometers = 1 m
670 nanometers = 670/10^9
= 6.7 × 10^-7m
Hope this helps
7. Disulfur dichloride can be made by reacting chlorine gas with molten sulfur. What is the yield of S2Cl2 expected in a laboratory experiment from the reaction of 10.0 g S8 and 6.00 g Cl2? What if the reaction consistently gives an 85.0 % yield?
Answer:
11.4g of S₂Cl₂ is the expected yield
9.69g of S₂Cl₂ are produced with a 85% yield
Explanation:
The reaction of sulfur S₈ with Cl₂ to produce S₂Cl₂ is:
S₈ + 4Cl₂ → 4S₂Cl₂
Where 1 mole of sulfur reacts with four moles of chlorine to produce four moles of disulfur dichloride.
To find the limiting reactant you need to convert mass of each reactant to moles using its molar mass, thus:
S₈ (Molar mass: 256.52g/mol): 10.0g ₓ (1mol / 256.52g) = 0.0390 moles S₈
Cl₂ (Molar mass: 70.9g/mol): 6.00g ₓ (1mol / 70.9g) = 0.0846 moles Cl₂
For a complete reaction of 0.0390 moles of sulfur, there are necessaries:
0.0390 mol S₈ ₓ (4 mol Cl₂ / 1 mol S₈) = 0.156 moles Cl₂. As you have just 0.0846 moles of chlorine, Cl₂ is the limiting reactant.
As 4 moles of Cl₂ produce 4 moles of S₂Cl₂. 0.0846 moles of Cl₂ produce, in theory, 0.0846 moles of S₂Cl₂ (Molar mass: 135.04g/mol). In mass:
0.0846 moles S₂Cl₂ ₓ (135.04g/mol) =
11.4g of S₂Cl₂ is the expected yieldIf you produce just the 85.0% of yield, mass of S₂Cl₂ is:
11.4g ₓ 85% =
9.69g of S₂Cl₂What is the correct answers
Answer:
B, C, D
Explanation:
Polyatomic ions are ions that have more than 1 atom.
Metallic ions are best described as: anions giving up electrons and attracting each other anions together in a sea of electrons cations grabbing electrons from anions cations together in a sea of electrons
Answer: cations together in a sea of electrons
Explanation:
Metallic bonding is the type of chemical bonding occurs between the atoms of a metals. In this type of bonding arises due to electrostatic interaction between the electron cloud of de-localized electrons with positively charges metal ions called as cations.
These de-localized electrons are the valence electrons of metal atoms which are shared between them.
In ionic bonding , the cations are attracted to anions where cations are formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Given the reaction below, which is the oxidized substance?
Mg + Cl2—>Mg2+ + 2C1-
A)2014
B)Cl2
C)Mg
D)Mg2+
Answer:
Mg ²⁺
Explanation:
Τhe metal loses electrons and in forming Mg²⁺ ,it loses 2 electrons and hence oxidized.
Mg(s) ⇒ Mg²⁺ + 2e⁻
The metal loses electrons, and when it becomes Mg2+, it loses two electrons, becoming oxidized. So, the correct option is D.
What is Oxidation reaction?Initially, the word "oxidation" was used to refer to chemical processes in which a component reacts with oxygen. An illustration of this is the oxidation of magnesium in the formation of magnesium oxide when magnesium and oxygen react.
Antoine Lavoisier used the term "oxidation" to describe the reaction of a material with oxygen. The meaning was later expanded to cover additional reactions in which electron are lost, irrespective of whether oxygen was present, after it was realised that the substance loses electrons when it is oxidised.
In the aforementioned example, the metal loses electrons; specifically, it loses two electrons as it changes from Mg+ to Mg2+, getting oxidized.
Therefore, the correct option is D
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Complete and balance HBr(aq)+NaHCO3(aq)→
Answer:
NaHCO3(aq) + HBr(aq) = CO2(g) + H2O(l) + NaBr(aq)
Explanation:
I think it's a doubel replacement.
3. How does this difference in language relate to our propensity to save?
Answer:
If you speak a futureless language, you will speak about time identically meaning you will feel as they are identical, it increases your propensity to save.
Explanation:
hope this helps you :)
Answer:If you speak a futureless language, you will speak about time identically meaning you will feel as they are identical, it increases your propensity to save.
Explanation:
Thats it
What are the coeffients that balance the following skeletal equation?
CH4 + O2 + Cl2 ® HCI + CO
Answer:
CH4 ---> 2
CL2 ----> 4
HCL -----> 8
CO-------> 2
Explanation:
Equation
CH4 + O2 + Cl2 => HCI + CO
we have to balance it
On LHS atoms of oxygen is 2 while on RHS it is 1 atom so lets balance oxygen first
to balance oxygen on RHS we add 2 as coefficient to CO
CH4 + O2 + Cl2 => HCI + 2CO
___________________________________________________
On RHS atoms of Carbon is 2 while on RHS it is 1 atom so lets balance Carbon now
to balance Carbon on LHS we add 2 as coefficient to CH4
2CH4 + O2 + Cl2 => HCI + 2CO
___________________________________
On LHS atoms of hydrogen is 8 so lets balance hydrogen now
to balance hydrogen on RHS we add 8 as coefficient to HCL
2CH4 + O2 + Cl2 => 8HCI + 2CO
______________________________________________
On RHS atoms of Cl is 8 while on LHS atoms of Cl is 2.
To make no of atoms of Cl 8 on LHS we add 4 as coefficient
2CH4 + O2 + 4Cl2 => 8HCI + 2CO
Thus, coefficients are as given below
CH4 ---> 2
CL2 ----> 4
HCL -----> 8
CO-------> 2
Which two of Earth's spheres interact when the rainfall in a region increases after a volcanic eruption?
Biosphere and geosphere
Biosphere and hydrosphere
Geosphere and cryosphere
Geosphere andhydrosphere
I need it for science class
Answer:
Geosphere and Hydrosphere
Explanation:
Rain is water, and the volcanic eruption from the valcano is rock
Answer:
The last one, the 4th one, D, Geosphere and Hydrosphere!
Explanation:
It is not Biosphere and geosphere or Geosphere and cryosphere because it doesn't include hydrosphere. It either has to be biosphere or geosphere with hydrosphere but it is not the biosphere with hydrosphere because the biosphere is covered with molten lava/lava rock(geosphere), so it has to be the last one, Geosphere and Hydrosphere!
What is the percent of nitrogen in dinitrogen pentoxide?
A 74.1
B 62.8
C 44.4
D 25.9
Answer: D.) 25.9%
Explanation:
Dinitrogen pentoxide chemical formular : N2O5
Calculating the molar mass of N2O5
Atomic mass of nitrogen(N) = 14
Atomic mass of oxygen(O) = 16
Therefore molar mass :
N2O5 = (2 × 14) + (5 × 16) = 28 + 80 = 108g/mol
Percentage amount of elements in N205:
NITROGEN (N) :
(Mass of nitrogen / molar mass of N2O5) × 100%
MASS OF NITROGEN = (N2) = 2 × 14 = 28
PERCENT OF NITROGEN : (28/108) × 100%
0.259259 × 100%
= 25.925%
= 25.9%
What does the frequency of a wave refer to?
O A. The number of waves that pass a point in 1 second
O B. The velocity of the wave in meters per second
O c. The height of the wave from top to bottom
O D. The distance between two peaks in the wave
The number of waves that pass a point in 1 second is the frequency of a wave. Therefore, the correct option is option A.
What is frequency of a wave?The frequency of a repeated event is its number of instances per unit time. It differs from angular frequency and is sometimes referred to anyone as temporal frequency greater clarification. The unit of frequency is hertz (Hz), or one occurrence per second. The time elapsed between events is measured by the period, which corresponds to the reciprocal of a frequency.
For instance, the period, T—the time between —is equal to half a second if a heart 120 times per minute. The frequency of oscillatory or events, such as mechanical motion and waves, is a crucial characteristic in science and engineering. The number of waves that pass a point in 1 second is the frequency of a wave.
Therefore, the correct option is option A.
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What energy transfer is occurring when you make a call on a phone?
A. electrical to chemical
B. heat to sound
C. electrical to sound
D. chemical to light
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7. Do you have any reservations about taking this course? Explain. How can I help?
I dont understand what it means by reservations
please help I just started this and I'm already stressed out
Answer:
Reservations means to say, are there any thoughts you have about this course that are negative. And what can your teacher do to help you excel, or succeed in this course. Good luck to you, and remember to take deep breathes when you need a break.
Explanation:
what is the formula for nitrogen decoxide? Is it ionic or covalent?
the formula for nitrogen decoxide is N2O5