Answer:
Protons: 23
Neutrons: 28
Electrons: 23
I THINK
Explanation:
Commercially available concentrated hydrochloric acid is 37.0% w/w HCl. Its density is 1.18g/ml. Calculate the molarity of concentrated HCl?
Answer:
M = 12.0M
Explanation:
Hello there!
In this case, according to the given by-mass percent of HCl, which can be set up in terms of mass of HCl over mass of solution, we can calculate the molarity, by multiplying by the density to get the mL's of solution and further convert to liters. Moreover, the molar mass of HCl (36.46 g/mol) must be also used to calculate the moles, since molar units requires moles of solute and liters of solution as shown below:
[tex]M=\frac{37.0gHCl}{100g\ sln}*\frac{1.18g\ sln}{1mL\ sln}*\frac{1000mL\ sln}{1L \ sln}*\frac{1molHCl}{36.46gHCl}\\\\M= 12.0M[/tex]
Best regards!
Just awnser #9#10#11#12 please ❤️ i will mark brainliest and also you get 15 points!
Answer: 9. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
10. The reasons for the differences in the surface temperature of terrestrial planets are due to their distance from the sun and the composition of their atmosphere.
11. 93.48 million miles
12. Iron core
Explanation: Hope this helped!! :)
please let me know if the answer is true or false. if false, please tell me what's false about it. the word that they are wondering if it needs to be changed is highlighted
Answer:
false the answer is woody
Explanation:
those are the two types of stems
Mr. Whiteman has two stock solutions of sulfuric acid (H2SO4) in the supply closet: 12.1 M and 6.0 M. If he wants to make 10.0 mL of a 1.0 M solution, which stock solution makes more sense to use? Justify with two calculations.
Answer:
12.1-M requires less volume of stock solution.
Explanation:
Hello there!
In this case, according to the foundations of dilution processes, it turns out convenient to remember that the moles of the solute before and after the dilution remains the same; for that reason we use the following equation:
[tex]M_1V_1=M_2V_2[/tex]
Relating the initial and final molarities and volumes. Now, it is seen that V2 is 10.0 mL and M2 is 1.0 M, which means that if we solve for V1 for 12.1 M and 6.0 M, we obtain the following volumes:
[tex]V_1=\frac{M_2V_2}{M_1} \\\\V_1^{12.1M}=\frac{1.0M*10.0 mL}{12.1M}=0.826mL\\\\V_1^{6.0M}=\frac{1.0M*10.0 mL}{6.0M}=1.67mL[/tex]
Therefore, since the 12.1-M solution requires less volume of stock solution, it makes sense to use this one as the initial solution.
Best regards!
A 25°C sample of gas has a volume of 5.0 L. What will it’s volume be if it is heated to 50.0°C?
Calcium carbonate + hydrochloric acid forms copper ___ + water + carbon dioxide
What does it form copper what please help me
Answer:
The answer copper carbonate
Most of the matter making up the earth is composed of
A. gases
B. compounds
C. mixtures
Most of the matter making up earth is composed of compounds. I think
Why must an electron absorb a quantum of energy to move to a higher energy level?
Answer:
For an electron they start at the first level (n=1) In order to move up to the next level (n=2) the amount of quantom energy to move to this next level the energy must be perfect in order to move. If the quantom energy is to small the electron it doesn't try.
Why do people who exercise more produce more carbon dioxide ?
Answer:
When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide.
Explanation:
Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.
What is exercise?Exercise is characterized as a physiological movement that maintains or enhances total physical wellness. People who exercise are less likely to get diseases and to maintain a healthy weight. Type 2 diabetes, heart disease, high blood pressure, and weight gain can all be warded off with regular exercise. Leaping, jogging, or lifting weights are examples of exercises that can support bone health.
The lungs both provide the body with oxygen, which gives you energy, and remove carbon dioxide from the system, which is a byproduct of energy production. The heart pumps oxygen-rich blood to the working muscles. Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.
Thus, because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.
To learn more about exercise, refer to the link below:
https://brainly.com/question/13128077
#SPJ2
When the air near the surface is heated, it rises, taking heat with it. The type of energy transfer involved here is what?
Nitrous acid is classified as an Arrhenius acid because HNO2 contains
1. OH-ions
2. 02-ions
3. NO2-ions
4. H+ ions
4) H+ions is your answer , good morning , have a great day ahead.
What is the pH at the equivalence point in the titration of 10.0 mL of 0.39 M HZ with 0.200 M NaOH? Ka = 2.4 × 10−6 for HZ.
Answer:
pH = 9.37
Explanation:
The reaction of HZ with NaOH occurs as follows:
HZ + NaOH → H₂O + Na⁺ + Z⁻
When the reaction is in the equivalence point, the moles added of HZ = Moles of NaOH.
At equivalence point, you will have in solution just NaZ that is in equilibrium with water as follows:
Z⁻(aq) + H₂O(l) ⇄ OH⁻(aq) + HZ(aq)
Where K of equilibrium is Kw / Ka = 1x10⁻¹⁴ / 2.4x10⁻⁶ = 4.17x10⁻⁹
And K is defined as:
K = 4.17x10⁻⁹ = [OH⁻] [HZ] / [Z⁻]
To solve this question we must find [Z⁻] and as [OH⁻] and [HZ] comes from the same equilibrium, both are equal and we can find [OH⁻] in order to solve pH:
Moles NaOH added = Moles HZ:
0.010L * (0.39mol / L) = 3.9x10⁻³ moles HZ = Moles NaOH added
The volume of 0.200M NaOH must be:
3.9x10⁻³ moles * (1L / 0.200moles) = 0.0195L.
The moles of HZ = Moles Z⁻ after the reaction and the volume is 0.010L + 0.0195L = 0.0295L. Thus, [Z⁻] is:
[Z⁻] = 3.9x10⁻³ moles / 0.0295L
[Z⁻] = 0.132M
Replacing in K expression:
4.17x10⁻⁹ = [OH⁻] [HZ] / [Z⁻]
4.17x10⁻⁹ = [X] [X] / [0.132]
5.51x10⁻¹⁰ = X²
X = 2.35x10⁻⁵M = [OH⁻]
As pOH = -log [OH⁻]
pOH = 4.63
And pH is
pH = 14 -pOH
pH = 9.379) What is the density of the gold rock with a mass of 386 grams and has a volume of 20 cubic centimeters?
O 0.193 g/cc
O 193 g/cc
O 1.93 g/cc
19.3 g/cc
Answer:
density= mass/volume
hence density of gold rock
= 386/20
=19.3 g/cc
. If 30.0 grams of copper (II) chloride reacts with 40.0 grams of sodium nitrate, what is the limiting reactant?
Answer:
The limiting reactant is copper (II) chloride
Explanation:
here you go
In an exothermic the change in enthalpy is usually
Positive, because the potential energy of the reactants is higher than the potential energy of the products
Neutral, because the potential energy of the products and reactants cancel each other out.
Negative, because the potential energy of the reactants is higher than the potential energy of the products
Positive, because the potential energy of the reactants is lower than the potential energy of the products
Answer:
Negative, because the potential energy of the reactants is higher than the potential energy of the products
Explanation:
Exothermic reaction is a reaction in which heat is released to surrounding. This is due to the fact that the heat content of the reactant is higher than the heat content of product thus producing a negative enthalpy change (ΔH) i.e
Enthalpy change = Heat of product – Heat of reactant
ΔH = Hp – Hr = negative
Considering the options given in the question above, the correct answer is:
Negative, because the potential energy of the reactants is higher than the potential energy of the products
2. How many moles of hydrogen are produced from the reaction of 3.86 moles of zinc with an excess of
hydrochloric acid?
Answer:
as per given balanced equation one mole Zn produces 1mole Hydrogen
when reacted with excess acid.
So 3 moles Zn will give 3moles Hydrogen
Explanation:
According to the balanced chemical equation, one mole of Zn produces one mole of hydrogen . Therefore, 3.86 moles of Zn metal will produce 3.86 moles of hydrogen gas.
What is mole ratio ?Mole ratio refers to the ratio of the number of moles of one substance in a chemical reaction to the number of moles of another substance in the same reaction.
It is derived from the balanced chemical equation for the reaction, which indicates the relative amounts of each substance involved in the reaction.
Mole ratio is important in stoichiometry, which is the study of the quantitative relationships between reactants and products in a chemical reaction.
The given chemical reaction is written as follows:
Zn + 2 HCl ⇒ ZnCl₂ + H₂
According to the balanced chemical equation, one mole of Zn produces one mole of hydrogen . Therefore, 3.86 moles of Zn metal will produce 3.86 moles of hydrogen gas.
Find more on mole ratio :
https://brainly.com/question/15288923
#SPJ2
2. The diagram shows a Zn/MnO2-KOH alkaline dry cell.
In your response, do the following:
• Label all parts.
• Label the cathode and the anode, including the charges on each.
• Show the flow of electrons.
• Explain how the cell works. Include the oxidation and reduction half-reactions in your explanation.
Answer:
1. Graphite rod (cathode)
2. Positive terminal
3. Solid zinc layer (anode)
4. Paste (reduction takes place here)
5. Negative terminal
Explanation:
This was the only thing i could find on it. hope this helps.
Answer:
Explanation:
• Label all parts.
1. Cathode or Graphite Rod
2. Positive terminal
3. Anode or Solid Zinc layer
4. Electrolyte Paste (reduction takes place here)
5. Negative Terminal (maybe this could also be the Zinc casing)
• Label the cathode and the anode, including the charges on each.
The anode is the zinc layer is negatively charged and the cathode is the graphite rod is positively charged.
• Show the flow of electrons.
The zinc casing is oxidized and the electrons flow along the zinc layer, into the negative terminal, and then out the negative terminal. The electrons move from the wire to the graphite rod. Then from the rod the electrons move to the paste, then the past goes through reduction. The anode gets a negative charge as electrons are released, and the cathode gets a positive charge as the electrons, which are negatively charged, are consumed.
• Explain how the cell works. Include the oxidation and reduction half-reactions in your explanation.
Alkaline dry cells use spontaneous oxidation-reduction reactions to convert chemical energy to electrical energy. According to the lesson ‘’Half-reactions are combined in a small casing, but still separated into half-cells.’’
Select the correct answer.
What does an atom gain or lose in an oxidation-reduction reaction?
A.
protons
B.
oxygen
C.
neutrons
D.
electrons
Answer:
D The atom gains an electron in an oxidation-reduction reaction.
What is the percent by mass concentration of 1000 ml of a solution (d=1.5 g/ml) that contains 50 g of solute in it?
Answer: The percent by mass concentration is 33.3 %
Explanation:
Mass percent is the ratio of mass of solute to the mass of solution in terms of percentage.
mass of solute = 50 g
mass of solution = [tex]{\text {density of solution}}\times {\text {volume of solution}}=1.5g/ml\times 1000ml=1500g[/tex]
Mass percentage = [tex]\frac{50g}{1500g}\times 100\%=33.3\%[/tex]
Thus percent by mass concentration of 1000 ml of a solution (d=1.5 g/ml) that contains 50 g of solute in it is 33.3 %
Mrs. Franklin decides to use her new aluminum pan to scramble eggs. She wants to determine how much heat energy will be needed to
heat her aluminum pan from 20 degrees celsius to 220 degrees celsius. She obtains the specific heat of aluminum from the reference
table. It lists the specific heat of aluminum as 0.90 N/kg*degrees celsius. The pan has a mass of 0.5 kg. She does the calculation
correctly. Which one of the following is her answer?
Your answer:
0.45 joules of heat energy
O 0.9 kilojoules of heat energy
O 90 kilojoules of heat energy
180 joules of heat energy
Answer:
90 kilojoules of heat energy
Explanation:
I don't really know why this is just the answer to it on my quiz so if someone else can explain.
Ben wants to test whether the material used to make a disposable cup affects the amount of thermal energy transferred to a person's hand. He investigates by carefully pouring the same volume of 90°C water into a foam cup and into a paper cup.
Which additional step in the investigation will help Ben determine which material reduces thermal energy (heat) transfer to the hand of a person holding the cup?
A.Stir the water in each cup for 10 minutes before measuring its temperature.
B.Measure the outside surface temperature of each cup after 10 minutes.
C.Vary the amount of water held by each cup before measuring its temperature.
Answer:
The answer would be B
Explanation:
C does not make sense and A will not affect anything
Measure the outside surface temperature of each cup after 10 minutes is the additional step in the investigation.
What is Temperature?This is defined as the degree of hotness or coldness of a substance and is measured in Celsius or Kelvin.
Determining which material reduces thermal energy will involve measuring the outside surface temperature of each cup after 10 minutes for the difference.
Read more about Temperature here https://brainly.com/question/24325419
On a hot day, a student places a glass of cold lemonade on a table outdoors. After a few minutes, water droplets have formed on the outside of the glass.
Is energy absorbed or released by the cold lemonade? Explain your answer.
Compare average kinetic energy for the air molecules and lemonade molecules when the student first places the lemonade outdoors. Explain your answer.
Explain how and why the water droplets form on the outside of the glass.
Answer:
ye but sdfajkd tryng to play me
Explanation:
Answer:
Vapor is released out of the lemonade because when you place it in a hot it will increase.
Explanation:
What event occurs when the
tension built up along Earth's
plates is released causing one
plate to slip past another?
Answer:
An earthquake
Explanation:
Calculate magnetic moment of a divalent ion in aqueous solution, if the electronic configuration is [Ar] 3d5 .
Answer:
5.47 B.M
Explanation:
✓We were given electronic configuration of argon as [Ar] 3d5.
✓This is a divalent ion. It has atomic number of 25.
✓magnetic moment can be calculated using below expresion
√[n(n+2)] .....................eqn(1)
✓ It has 5 unpaired electrons. Then n= 5
✓ [n(n+2)]
✓ substitute the ( n= 5) into eqn(1)
Then magnetic moment= [n(n+2)]
= [ 5(5+2) ]
= 5.47BM
Combustion engines became common in the mid-1800s when people began to use them to power ships, trains, and
machinery in factories. Combustion engines add carbon dioxide to the air, and as a result, carbon dioxide in the
atmosphere increased quickly. How did this change the total amount of energy in the Earth system, and how did this
change happen? How did this affect global average temperature?
I need help please and don’t send the fake link): < just to get points
Answer:
The correct answer is - increased the global average temperature.
Explanation:
Combustion is the process that increases the carbon dioxide in the atmosphere, which results in entering more energy into the Earth system than existed from it. Therefore, the amount of energy increased in the system of the earth or surface of the earth.
The reason behind it is that carbon dioxide trapped and redirects energy back toward the Earth's surface, which is absorbed by Earth's surface and surface increased, and global average temperature increased.
Combustion process increases the global average temperature of the earth by absorbing and emitting the energy revert back to earth.
What is combustion?Combustion is a process exothermic process in which organic molecules burns in the presence of oxygen to produce energy in the form of heat and light and CO₂ gas.
CO₂ gas is a green house gas which traps the energy of the atmosphere and revert back it into the earth surface, due to which temperature of the earth surface and atmosphere increases which results in the elevation of global average temperature.
Hence, combustion increases the global average temperature.
To know more about combustion, visit the below link:
https://brainly.com/question/15246277
How many grams of H2O is created from 60 grams of O2?
[2 H2 + O2 —> 2 H2O]
Answer:
67.5 gm H2O
Explanation:
2 H2 = 4 gm
O2 = 32 gm
2 H20 = 36 gm
so 32 gm O2 results in 36 gm H20
32/36 = 60/x x = 67.5 gm
Chemistry help! Please zoom in to see better
Answer:
82.04g
Explanation:
To solve this problem, you need to find the molar mass of HCl, which is the sum of the molar mass of H plus the molar mass of Cl. The molar mass of H is 1.008g/mol while the molar mass of Cl is 35.45g/mol. Thusly the molar mass of HCl is 36.458g/mol. You have 2.25 moles of HCl, so multiply the number of moles by the molar mass to get the mass in g. In this case it is 2.25mol * 36.458g/mol = 82.04g.
If I helped, a brainliest would be greatly appreciated!
what happen when a piece of silver metal is added to the copper sulphate solution
Answer:
Explanation:When silver Ag metal is added to copper sulphate CuSO4 solution, no reaction takes place as silver is less reactive than that of copper and cannot displace copper from its solution. Hence, when a piece of silver metal is added to copper sulphate solution there will be no reaction.
Answer:
There will be no reaction
Explanation:
Therefore, when silver Ag metal is added to copper sulphate CuSO4 solution, no reaction takes place as silver is less reactive than that of copper and cannot displace copper from its solution. Hence, when a piece of silver metal is added to copper sulphate solution there will be no reaction.
What is PO3 compound name?
Answer:
PHOSPHITE ION is the correct answer.
Explanation:
Hope this helped Mark BRAINLIEST!!!
Lysol Power Toilet Bowl Cleaner contains 9.5% hydrochloric acid. Explain why this would be necessary to clean toilet bowls that have white or rust-coloured deposits
Answer:
The acid will absolutely remove the hard water deposits that are trapping the stains. The longer it soaks, the less you have to scrub. It works for hard water stains, limescale, and rust!
Explanation:
hope this helped you out.