20 POINTS + BRAINLIEST, HELP
Answer:
B
Explanation:
You add them all together if I'm correct. (I'm in middle school so don't get mad if its wrong lol)
Answer: 4) 2.5
Step-by-step explanation:
The ratio of line segments as per picture
5/x = 4.6/2.3
x = 2.5
Correct option is
4) 2.5
Explanation:JK ITS B.
A sample of vinegar containing 0.100 mol of ethanoic acid has a concentration of 0.125M of ethanoic acid. What is the volume of the solution.
0.8 L
Explanation:We are given:
Molarity of Ethanoic Acid in vinegar = 0.125 M
Number of moles of Ethanoic Acid = 0.1 mole
Finding the volume of the solution:
We know that the molarity of a solution is defined as:
Molarity = n / V (where n is the number of moles and V is the volume in L)
replacing the variables with the given values:
0.125 = 0.1 / V
Multiplying by V on both the sides
0.125V = 0.1
Dividing both sides by 0.125
V = 0.1 / 0.125
V = 0.8 L
Therefore, the volume of the solution is 0.8 L
HElp me plzzzzz??????
Answer:
The answer to your question is given below
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Zn + 2HCl —> ZnCl2 + H2
Thus, we can write out the atoms present in both the reactant and the product by doing a simple head count. The atoms present are listed below:
Element >>> Reactant >>> Product
Zn >>>>>>>> 1 >>>>>>>>>> 1
H >>>>>>>>> 2 >>>>>>>>> 2
Cl >>>>>>>>> 2 >>>>>>>>> 2
What is the ratio of ions needed to produce neutral potassium chloride?
A. One potassium ion to one chloride ion.
B. Two potassium ions to one chloride ion.
C. One potassium ion to two chloride ions.
D. Two potassium ions to three chloride ions.
Answer:
A
Explanation:
Why not
Answer:
A on edge 2021
Explanation:
Please show work: A car travels at a rate of 65 miles per hour. If the car gets 33.5 miles to the gallon, how many hours can a car travel on 25.0 pounds of fuel? (density of fuel is 6.50 pounds/gallon)
Answer:
Explanation:
First divide 25.0 by 6.5 to get the amount of fuel you have.
What is the molar ratio of Li to N2 in the given reaction?
6Li + N2 → 2Li3N
Answer:
6moles of Li : 1 mole of N₂
Explanation:
The reaction equation is given as:
6Li + N₂ → 2Li₃N
Mole ratio of Li to N₂;
From the balanced reaction equation:
6 moles of Li will react with 1 mole of N₂;
The mole ratio is:
6moles of Li : 1 mole of N₂
How many mL of 0.650 M solution can be prepared by dissolving 15.0 g of copper(II) nitrate in
water?
Answer:
123.1L
Explanation:
Given parameters:
Molarity of Cu(NO₃)₂ = 0.650M
Mass of Cu(NO₃)₂ = 15g
Unknown:
Volume of Cu(NO₃)₂ = ?
Solution:
To solve this problem, we have to first find the number of moles of the given mass;
Number of moles of Cu(NO₃)₂ = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Cu(NO₃)₂ = 63.5 + 2 (14 + 3(16)) = 187.5g/mol
Number of moles of Cu(NO₃)₂ = [tex]\frac{15}{187.5}[/tex] = 0.08 mol
Molarity is given as;
Molarity = [tex]\frac{number of moles }{volume}[/tex]
Volume = [tex]\frac{number of moles }{molarity }[/tex]
Insert the parameters and solve;
Volume = [tex]\frac{0.08}{0.65}[/tex] = 0.12L
Now mL;
1L = 1000mL
0.12L will give 1000 x 0.12 = 123.1L
Please can someone help me on number 4 please it due today at 7:20pm please please help me will mark the brainiest please please help me please thank you
Answer:
I am the one who you just got a 100 points from from the 100 Point giveaway. I guess I gave away all my points except for one, so I need more points so I hope you don't mind if I am writing this, because you won't get another person to answer. Sorry!
Explanation:
At which location are metamorphic rocks most likely to
form?
When rocks are subjected to high heat, high pressure, hot mineral-rich fluids, or, more typically, some combination of these variables, metamorphic rocks develop.
What are rocks?Rocks are defined as those formed from magma, a molten mixture of rock-forming minerals and typically volatiles such as gases and steam.
There are three types of rocks.
Igneous rock - They are defined as forms of rocks that occur when molten rock (rock that has been liquefied by extreme heat and pressure) cools to a solid condition.Sedimentary rock - They are defined as kinds of rock created by mineral or organic particle accumulation or deposition near the Earth's surface, followed by cementation.Metamorphic rock - They are defined as the rock developed throughout time as a result of many physical changes such as pressure, heat, and varied chemical activity. Metamorphism is the process through which existing rocks are transformed into new forms of rocks.Thus, when rocks are subjected to high heat, high pressure, hot mineral-rich fluids, or, more typically, some combination of these variables, metamorphic rocks develop.
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Write a decay equation for neon-19
Answer:
Neon
Mass Number Half-life Decay Mode
Electron Capture
Electron Capture with delayed Proton Emission
18 1.6670 seconds Electron Capture
19 17.22 seconds Electron Capture
Calculate the lithium ion (Li+) concentration for a 0.821 M Li2S solution.
The lithium ion[Li⁺]=1.642 M
Further explanationIonic compounds will dissociate into ions when dissolved in water. The strength of the dissociation depends on the strength of the electrolyte properties. The stronger it is, the more ions will dissociate
Reaction
Li₂S⇒2Li⁺+S²⁻
mol ratio Li₂S : Li⁺: S²⁻ = 1 : 2 : 1
so the lithium-ion (Li⁺) concentration :
[tex]\tt 2\times 0.821=1.642~M[/tex]
sodium chloride is made from sodium and chloride. would you expect the properties of sodium chloride to be simliar to sodium or cloride
Answer:
No
Its a chemical change so the characteristics or chemical properties always differs thereby the properties of sodium chloride isn't similar to sodium or chloride
what types of air masses affect Florida
Answer:
The maritime tropical air mass keeps temperatures in Florida in the 80s and 90s in summer and in the 70s and 80s in winter. It can be pushed south by large continental polar and maritime polar air masses from the north and is affected by the reduced sunlight in winter.
Explanation:
There are different types of air masses based on the region from there they originates. Florida usually experience maritime and tropical air masses.
What is air masses?A huge body of air with a somewhat constant temperature and humidity is referred to as an air mass. Air mass source regions are the places where air masses originate.
For a sufficient amount of time, air will absorb the characteristics of the surface beneath it. The best source regions are those that are uniformly flat and composed. Siberia, central Canada, seas, and vast deserts are a few examples.
Tropical air masses are identified by a capital "T" for tropical. They originate in warm, tropical climates. A capital "A" for arctic is used to identify air masses that originate there. Dry air masses from the continental origin are those that originate over land.
Florida's northern and central regions experience a humid subtropical climate. The climate in South Florida is tropical. Hence tropical air masses are found in Florida.
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which compound has covalent bonds? H2O, Li2O, Na2O, K2O
Answer:
H2O
Explanation:
H2O is just given as a covalent compound... Usually covalent bonds occur between 2 or more nonmetals.
Water or H₂O is a compound which has covalent bonds as there is slight difference in electronegativity of hydrogen and oxygen atoms.
What is a covalent bond?
Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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A student drew a diagram of the quantum model of an atom, as shown.
A small circle is shown. Six light gray spheres and six dark gray spheres are shown inside the circle. On the outer side of the circle is another circle of larger radius. This circle has two small circle on its boundary. Another circle of even greater radius is on the outside of the second circle. This outermost circle has four small circles on its boundary.
Which of the following explains if the student's diagram is correct or incorrect?
A - The diagram is incorrect because electrons follow an elliptical path instead of a circular path.
B - The diagram is incorrect because the exact location of the electrons cannot be determined.
C - The diagram is correct because protons and neutrons are concentrated at the center of the atom.
D - The diagram is correct because electrons are present in distinct energy levels around the nucleus.
The diagram is correct because electrons are present in distinct energy levels around the nucleus. Option D
What is the quantum model?Let nus just take a minute to be able to remind ourselves that when we look at the atom that there are several subatomic particles that can be shown to be able to make up the atom. We know that the electron is the particle that can be shown to be arranged in shells.
What we saw in the inner or the core of the atom is the nucleus and the six grey spheres that we can see there would have to do with the nucleus of the atom that is in the question.
As we now look up at the shells, we can see the electrons as they have been arranged into the respective shells were they can be found in the atom on the basis of the energy that they possess.
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PLEASE HELP ME! CHEMISTRY!
reactants: calcium chloride + sodium bicarbonate
products: carbon dioxide + calcium carbonate + sodium chloride + dihydrogen monoxide
question; is this equation balanced? explain reason. if not balanced, how should it be balanced? what is the balanced equation?
Answer:
No it is not balanced
Explanation:
CaCl2 + 2NaHCO3 → CO2 + CaCO3 + H2O + 2NaCl
Hope this helps
Calculate the heat of reaction AH for the following reaction:
2 HCl(g) + F2(g) → 2 HF(g) + Cl2(9)
Answer:
can u give the bond energies
An object with a mass of 20.0 kg has a force of 5.0 Newton's applied to it. What is the resulting acceleration of the object?
CH3
CH,CCHCHCHCl
OH
Spell out the full name of the compound.
Answer:
CH3 – CH – CH – CH2 – CH – CH3
| | |
CH3 CH2 CH3
|
CH3
Explanation:
3 - etil - 2, 5 - dimetilhexano
When a solid reaches its melting point, what happens? 1. melting 2. freezing. 3. vaporization 4. boiling
Which of the following is an example of a carnivore?
A. human
B. giraffe
C. elephant
D. lion
Answer:
D, Lions
Explanation:
Lions are meat eaters, meaning their food and energy requirements derive solely from anima tissue or meat (whether from hunting or scavenging)
what is the missing value
Answer:
72
Explanation:
The pattern here may be hard to find at first, but it's this: the number in the middle of the triangle = (number at lower left corner of triangle x number at upper vertex of triangle) + (number at upper vertex of triangle x number at lower right corner of triangle).
Thus, for the missing value...
Missing value = (3x8) + (8x6) = 24+48 = 72.
Could you tell me what concept in chemistry relates to this? I'm interested.
Also check out stylesben's answer. Seems like there's several ways of doing this.
Answer:
the answer is 72
Explanation:
6+3=9 and multiply 9 with 8 and answer comes 72
Relation between glancing and angle of deviation
Answer:
the Glancing angle is the angle between the incident ray and plane mirror which is 90o in the given case. The angle between the direction of the incident ray and the reflected ray is the angle of deviation. Since the angle of deviation for a plane mirror is twice the glancing angle, the angle of deviation is 1800.
Type your answer in decimal form. Do not round.
7 days = hours
What type of particles move to create electicity?
electrons
protons
neutrons
the answer is electrons.....
Answer:
electrons
Explanation:
Th ph value of milk is close to
Answer:
6.5
Explanation:
12.5 mL of 0.280 M HNO3 and 5.0 mL of 0.920 M KOH are mixed. Is the resulting solution acidic, basic or neutral?
Answer:
The resulting solution is basic.
Explanation:
The reaction that takes place is:
HNO₃ + KOH → KNO₃ + H₂OFirst we calculate the added moles of HNO₃ and KOH:
HNO₃ ⇒ 12.5 mL * 0.280 M = 3.5 mmol HNO₃KOH ⇒ 5.0 mL * 0.920 M = 4.6 mmol KOHAs there are more KOH moles than HNO₃, the resulting solution is basic.
The resulting solution is basic.
• It is known that KOH is a base and HNO3 is an acid, so when they mix they undergo a neutralization reaction.
• The reaction between there will be,
HNO3 + KOH ⇔ KNO3 + H2O
Based on the given information,
• The volume of HNO3 is 12.5 ml and the molarity is 0.280 M, and the volume of KOH is 5 ml and the molarity is 0.920 M.
Now 1 mole of HNO3 completely reacts with 1 mole of KOH,
The millimoles of HNO3 is,
[tex]= Molarity * Volume (in ml)\\= 0.280 * 12.5\\= 3.5 mmol[/tex]
The millimoles of KOH is,
[tex]= Molarity * Volume (in ml)\\= 0.920 * 5.0\\= 4.6 mmol[/tex]
Now it can be seen that 3.5 millimoles of HNO3 completely reacts with 3.5 millimoles of KOH. Now we are left with 4.6-3.5 = 1.1 mmol of KOH.
Thus, KOH is in excess amount present in the solution, and as it is basic in nature, therefore, the resultant solution would be basic in nature.
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What is the change in internal energy ΔU for a system that releases 241J of heat and does 1.20kJ of work on the surroundings. Answer may be in J or kJ.
Answer:
[tex]\Delta U=-1,441J[/tex]
Explanation:
Hello!
In this case, since the first law of thermodynamics explains how the heat added to the system and the work done by the system equals the change in the internal energy of the system, we can write:
[tex]\Delta U=Q-W[/tex]
Next, since the system releases 241 J of energy (negative on the previous equation) and does 1.20 kJ (1200 J) of work, the change in the internal energy turns out:
[tex]\Delta U=-241kJ-1,200kJ\\\\\Delta U=-1,441J[/tex]
Best regards.
Write couple of paragraphs on "Role of Youths inreforming the society.
Answer:
Explanation:
They have the ability to learn and adapt to the environment. ... Our youth can bring social reform and improvement in society. We cannot make do without the youth of a country. Furthermore, the nation requires their participation to achieve the goals and help in taking the country towards progress
Determine the acid dissociation constant for a 0.010 M nitrous acid (HNO2) solution that has a pH of 2.70. Nitrous acid is a weak monoprotic acid and the equilibrium equation of interest is:________
Answer:
HNO₂ ⇄ H⁺ + NO₂⁻
Ka = 4.0 × 10⁻⁴
Explanation:
Step 1: Given data
Concentration of nitrous acid (Ca): 0.010 MpH of the solution: 2.70Step 2: Write the acid dissociation reaction
Nitrous acid is a weak acid that dissociates according to the following expression.
HNO₂ ⇄ H⁺ + NO₂⁻
Step 3: Calculate the concentration of H⁺
We will use the definition of pH.
pH = -log [H⁺]
[H⁺] = antilog - pH = antilog -2.70 = 2.00 × 10⁻³ M
Step 4: Calculate the acid dissociation constant (Ka)
For a weak acid, we can calculate Ka using the following expression.
Ka = [H⁺]²/Ca
Ka = (2.00 × 10⁻³)²/0.010
Ka = 4.0 × 10⁻⁴