Answer:
In order to obtain a volume of
1 L
,
500 mL
of water must be added to the original solution of
500 L
.
Explanation:
The element which has atomic number 17 is considered from... A. Metals B. Non-metals C. Noble gas D. No correct answer Please explain with your answer.
Answer:
B. Non-metals
Explanation:
The element with the atomic number of 17 is Cl.
Chlorine belongs to the group 7 in the periodic table. It is a non metal.
Correct option: B. Non-metals
The number of energy levels is determined by the
a. groups
b. periods
c. valence electrons
d. atomic mass number
Answer:
The answer is C
Explanation:
I did look it up, the other kid just spams random bs for points, hope you didn't get it wrong because of him! :)
Give an example of a system that has energy.
Answer:
Aerobic Energy System
Explanation:
Answer:
Digestive system. It contains chemical energy. The digestive system breaks down food. Food contains chemical energy. To break down the food, the digestive system contains enzymes. Enzymes have kinetic energy to move and break down the food. They are biological catalysts. They transfer to the thermal energy store since in order to break down food at the fastest rate, they need to be at an optimum temperature.
I'm not sure if it's correct, but I'll provide some energy stores to give you inspiration:
Kinetic energy
Chemical energy
Nuclear energy
Gravitational potential energy
Elastic potential energy
Thermal energy
What is the word equation for molecules of magnesium reacting with molecules of oxygen to produce molecules of magnesium oxide?
Answer:
magnesium + oxygen = magnesium oxide
Explanation:
the word equation for molecules of magnesium reacting with molecules of oxygen to produce molecules of magnesium oxide is magnesium oxygen magnesium oxide.
Calculate the molar concentration of OH ions in a 0.066 M solution of ethylamine (C2H5NH2: Kb= 6.4 x 10-)
Express your answer to two significant figures.
Answer:
6.5x10⁻³M = [OH⁻]
Explanation:
The Kb of a Weak base as ethylamine is expressed as follows:
Kb = [OH⁻] [C₂H₅NH₃⁺] / [C₂H₅NH₂]
As the equilibrium of ethylenamine is:
C₂H₅NH₂(aq) + H₂O(l) ⇄ C₂H₅NH₃⁺(aq) + OH(aq)
The concentration of C₂H₅NH₃⁺(aq) + OH(aq) is the same because both ions comes from the same equilibrium. Thus, we can write:
Kb = [OH⁻] [C₂H₅NH₃⁺] / [C₂H₅NH₂]
6.4x10⁻⁴ = [X] [X] / [C₂H₅NH₂]
Also, we can assume the concentration of ethylamine doesn't decrease. Replacing:
6.4x10⁻⁴ = [X] [X] / [0.066M]
4.224x10⁻⁵ = X²
6.5x10⁻³M = X
6.5x10⁻³M = [OH⁻]The molar concentration of OH ions in a 0.066 M solution of ethyl amine is [tex]6.5x10^-^3M[/tex]
What is molar concentration?Molar concentration is the measure of the concentration of the chemical species present in any solution.
Step1: Calculating The Kb
[tex]Kb = [OH^-]\dfrac{ [C_2H_5NH_3^+] }{[C_2H_5NH_2]}[/tex]
As the equilibrium of ethyl amine is:
[tex]\rm C_2H_5NH_2(aq) + H_2O(l) <-> C_2H_5NH_2^+(aq) + OH(aq)[/tex]
[tex]Kb = [OH^-]\dfrac{ [C_2H_5NH_3^+] }{[C_2H_5NH_2]}[/tex]
[tex]6.4\times10^-^4 = \dfrac{ [X][X]}{[C_2H_5NH_2]}[/tex]
The concentration of ethyl amine does not decrease.
[tex]\rm 6.4\times10^-^4 = \dfrac{ [X][X]}{0.066\;M}[/tex]
[tex]4.224\times10^-^5 = X^2[/tex]
[tex]6.5x10^-^3M = X\\\\6.5x10^-^3M = [OH^-][/tex]
Thus, the molar concentration is [tex]6.5x10^-^3M[/tex]
Learn more about molar concentration, here:
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Write out the balanced chemical equation for the reaction for when phosphate calcium reacts with lead chloride
Answer:
Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
(b) Zinc + Silver nitrate → Zinc nitrate + Silver
(c) Aluminium + Copper chloride → Aluminium chloride + Copper
(d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chlorid
Explanation:
plsssss help !! what are the steps to convert from atoms, compounds, formula units, ect to moles
Answer:
Explained below.
Explanation:
From avogadro's number, we know that;
1 mole = 6.022 × 10^(23) atoms, molecules, protons e.t.c.
Now,to convert from atoms, compounds, formula units, etc to moles, what we will do is just to divide the amount of the particle value given in the specific units by avogadro's number.
For example, to convert 23 × 10^(20) atoms to moles, we will have;
Number of moles = (23 × 10^(20))/(6.022 × 10^(23)) moles = 0.00382 moles
Identify the daughter isotope in this nuclear reaction: Superscript 222 subscript 88 upper R a right arrow superscript 218 subscript 86 R n plus superscript 4 subscript 2 upper H e. Which is the daughter isotope? Superscript 218 subscript 86 R n. Superscript 4 subscript 2 upper H e. Superscript 222 subscript 88 upper R a.
The daughter isotope which is present in the given radioactive decay is ²¹⁸₈₆R.
What is daughter isotope?A daughter isotope is the isotope that remains following the radioactive decay of an original isotope.
In the question parent nuclei is given that ²²²₈₈R, and given chemical equation is:
²²²₈₈R → ²¹⁸₈₆R + ⁴₂He
In the above equation ²¹⁸₈₆R is the daughter nuclei and ⁴₂He is the emitted particle or rays.
Hence ²¹⁸₈₆R is the daughter isotope.
To know more about daughter isotope, visit the below link:
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#SPJ2
Answer:
222 88Ra
Explanation:
Does volume alone determine whether an object will float or sink?
Answer:
no volume does not
Explanation:
What is the number of copper atom in one naira coin which weight is 7.3g a sum of the material is 86%
Answer:
5.9x10²² atoms of Cu are in one naira coin
Explanation:
To solve this question we need to find the mass of Copper. Then, using its molar mass (Cu = 63.546g/mol) we must find the moles of Cu and its atoms using Avogadro's number:
Mass Cu:
7.3g * 86% = 6.278g is the mass of Cu.
Moles Cu:
6.278g * (1mol / 63.546g) = 0.099moles Cu
Atoms Cu:
0.099moles Cu * (6.022x10²³atoms / 1mol) =
5.9x10²² atoms of Cu are in one naira coinhello, do you think you know the order of this?
Answer:
1. A
2. B
3. D
4. C
Explanation:
Just trust me. Good luck on your test! (I go to K12 as well.)
Write the product for each synthesis reaction . Balance the chemical equation . a) Be+O 2 Li+Cl 2 c) Mg+N 2 d) Al+Br 2 K+O 2
Answer:
j,
Explanation:
Birds' feet change slowly over time, depending on their habitat. Ptarmigans live in snowy areas and eat pine needles, twigs, and insects. Roadrunners live in deserts and plains and eat anything they can catch. Peregrine falcons live on high perches and use their talons for grasping their prey. Mallards live near water and swim and dive for food.
What is an inherited behavior or physical change that helps an organism survive and reproduce in its environment?
A. adaptation
B. variation
C. evolution
D. species
Answer:
A
Explanation:
What risks does nuclear waste pose to Earth or the sun or outer space?
Answer:
It could pollute other planets. Nuclear waste might be attracted by the gravitational pull of the sun and disintegrate there instead. The waste storage spacecraft could crash into a planet, moon, or another astronomical body. It could be dangerous for other life forms out there.
Explanation:
Can you identify a sample from a living organism by examining it under a microscope? Yes or No
The number of collisions between the particles of hydrogen and nitrogen is increased by using high
pressure and _______
What one word completes the sentence?
Answer:
temperature
Explanation:
increase in temperature increases the rate of reaction
PLEASE ANSWER ALL QUESTIONS WILL MARK BRAINLY
1. Calculate the density for the following cube if it’s mass is 1.25 g and each side has a measurement of 3 cm.
2. Would the cube in question 1 float or sink in water? ( Calculate the density for the following cube if it’s mass is 1.25 g and each side has a measurement of 3 cm.)
3. If an irregular-shaped piece of gold is placed into a graduated cylinder and it displaces 15 ml of water, what is the volume of the object?
4.How many elements are in the particle with the chemical formula C2H7N3?
5.How many atoms are in the particle with the chemical formula C2H7N3
Answer:
1. 2.89
2. Will it float in fresh water? Yeah, sure it will!
3. 5g/ml
4. 3 because the letters represent the elements
5. 12
Explanation:
What is used up in and stops a chemical reaction?
Answer:What is used up in and stops a chemical reaction? (a) percent yield (b) limiting reactant (c) theoretical yield (d) excess reactant
The correct option is (b)
Explanation:
A chemical reaction is a chemical combination,rearrangement or disintegration of chemical substance(s) (called reactants) to form new chemical substance(s) (called products).
A limiting reactant is the reactant that is totally used up during the course of a reaction. When this reactant is used up, it limits the amount of products formed and eventually stops the chemical reaction.
Explanation:
The limiting reagent is the reactant that is used up completely. This stops the reaction and no further products are made. ... This method is most useful when there are only two reactants. The limiting reagent can also be derived by comparing the amount of products that can be formed from each reactant.
hope this helps have a nice day❤️
What best describes a mixture
Answer:
In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. ... A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
CHEMISTRY
OXIDATION NUMBERS
please help me solve only 3 of those oxidation numbers
NO2
Cr2O72-
KCl
NH3
CaH2
SO42-
Na2O2
SiO2
CaCl2
Answer:
NO2=Nitrogen dioxide
KCL=potassium chloride
NH3=Ammonia
How many grams of aluminum is produced when 82.4 grams of aluminum chloride
decomposes into chlorine gas and aluminum metal?
2AICI: - 2 Al + 3C12
Answer:
16.6 g of Al are produced in the reaction of 82.4 g of AlCl₃
Explanation:
Let's see the decomposition reaction:
2AlCl₃ → 2Al + 3Cl₂
2 moles of aluminum chloride decompose to 2 moles of solid Al and 3 moles of chlorine gas.
We determine the moles of salt:
82.4 g . 1mol/ 133.34g = 0.618 moles
Ratio is 2:2. 2 moles of salt, can produce 2 moles of Al
Then, 0.618 moles of salt must produce 0.618 moles of Al.
Let's convert the moles to mass → 0.618 mol . 26.98g /mol = 16.6 g
What parts of an atom can change during a nuclear reaction that cannot change during a chemical reaction? The number of neutrons and electrons The number fo protons and neutrons The number of electrons only The number of protons and electrons
Answer:
The number of protons and neutrons.
Explanation:
Neutrons and Protons can't be removed from nucleus from chemical reactions because they are held together super strong and tight. However, nuclear reactions are strong enough to separate them.
hope this helps :)
Answer:
The number of protons and neutrons
Explanation:
I
A sample of gas has a volume of 606 mL at 35 °C. What temperature is necessary for the
gas to have a volume of 854 ml?
A 49 K
B. 707 K
C. 219 K
D. 434 K
Answer: D. 434 K
Explanation:
To calculate the final temperature of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where,
[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.
[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.
We are given:
[tex]V_1=606ml\\T_1=35^oC=(35+273)K=308K\\V_2=854ml\\T_2=?[/tex]
Putting values in above equation, we get:
[tex]\frac{606}{308}=\frac{854}{T_2}\\\\T_2=434K[/tex]
Thus temperature necessary for the gas to have a volume of 854 ml is 434 K
.What is the KE of a baseball that has a mass of 100 kg and is traveling at 5 m/s?
Answer:
1250joules
Explanation:
The kinetic energy is energy in motion and it's formula is
KE =1/2MV^2
M represent mass which is 100Kg.
V represent velocity which is 5m/s
Therefore, KE = 1/2×100×5× 5
= 50 × 25
KE= 1250joules
Which statement about planetary orbits is correct?
O A. The planets travel in perfect circles around the sun.
O B. The planets travel in perfect circles around Earth.
O C. The planets travel in ellipses around the sun.
OD. The planets travel in ellipses around the moon.
Answer: C planets dont travel in perfect circles and they do not orbit earth they orbit the sun and they ellipse around the sun. this is the correct answer do not lsiten to the other person
Explanation:
The statement which is correct about planetary orbits is the planets travel in ellipses around the sun.
What are orbits?Orbits is the path of the motion, in which planets do revolutionary motion in a particular sequence.
In the solar system, sun is present at the center and all the planets do revolution around the sun in their orbits which are ellipse in their shape. Elliptical shape of the orbits is due the large distance of planets from the sun which reduces the speed due to less gravitational force of sun on that object.
Hence, option (C) is correct i.e. The planets travel in ellipses around the sun.
To know more about orbits, visit the below link:
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what conditions are required for establishing an equilibrium?
Answer:
1. By praying in the day or meditating
Being successful in your life will start with deciding to change in order to Learn. To make this happen, you need a good attitude and discipline. If you are already in the place where you are writing, it cannot be said because you probably like other things in your life very much. Make it a habit to start your day by praying or meditating. This will help you feel that you are more than who you think you are, thus showing that you can make it physical than you think you can and be in a different place in life than the one you are facing right now. Connect with yourself, be confident, and understand that you see better.
2.Be fully present when you are with your family
Family life is the area most associated with work-life balance. Having a good family life is like being at the top of your work-life balance. After all, your family will always be with you in your good and bad days. Friendships may end, but family relationships last. Start making changes in your life by making it in your family life. Make it a habit to spend quality time with them. Be more involved in their life, physically and spiritually.
3.Thank you to people you already know
Good connections are essential in business. It causes you to do more and better work. Good and strong connections in your personal life, on the other hand, allow you to develop yourself in different areas of life. This is another way to achieve balance. Developing your environment and making strong connections helps you learn from other people, broaden your perspective, and even broaden your vision of life. Communicate with the least person you know every day. It's always easier for you to start expanding your network with people you know. Tell him what you are busy with, ask him what he is busy with and if he needs help. Asking for help for yourself will also build trust. And it's okay to ask him if he knows other people who can help you
4.Do something creative
Although the left brain right brain dominance theory has been debunked, the world still cares more about activities attributed to the left brain, such as logic and measurement. Most businesses prefer analytical to creative thinking. And many people decide that creative thinking is impractical and discard it. Whatever your job is, you shouldn't give up your creative qualities. As an employee or employer, you have to be creative for more customers, more work and more marketing. Notice how your blood is pumping and how your adrenaline rises. Only right brain activities and creativity affect your lives. More importantly, the way to improve your vision and create new opportunities for your business and social life is through creativity. If your artist side is dominant, you should devote more time to activities such as painting, music, animation, and literature; maybe even consider starting a blog for yourself. This will help you to balance and add color to your life after a long and monotonous 'left-brain' weighted day.
5.30-minute walks
The first five items consisted of things you need to focus on every day for your emotional, relational, and personal success. But in order to develop and enjoy this success, you must also improve your Physical health. Make it a habit to move. Walk for half an hour a day, go to the gym, or even stretch your body every hour you sit down. Physical activities have many alternatives and benefits. Choose the most convenient and tasteful for you.
Explanation:İYİ GÜNLER
This question is about metal oxides. When sodium is heated in oxygen, sodium oxide is produced.
Na + O2 ⟶ 2 Na2O
How many atoms of Na are required to balance this equation
Answer:
This is very easy Cuz We have 2Na2O We have O2 so thats molecule of Oxygen and its same on product We need to balance Na on start We have 1 on product We have 2 so Just put 2 at start....
Explanation:
Sorry for bad english not my first language :(
2Na+O2-->2Na20
What type of solution do you create if you put 50g of NH4Cl in 100g of water at 70 degrees C
Answer:
hi
Explanation:
How much carbon dioxide will be formed if 12.5 grams of oxygen reacts with 7.2 grams of propane (C3H8 )? Balanced equation: C3H8 + 5 O2→ 3 CO2 + 4H
Answer:
10.3125 grams of carbon dioxide will be formed.
Explanation:
The balanced reaction is:
C₃H₈ + 5 O₂→ 3 CO₂ + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles participate in the reaction:
C₃H₈: 1 mole O₂: 5 molesCO₂: 3 moles H₂O: 4 molesBeing the molar mass of the compounds:
C₃H₈: 44 g/mole O₂: 32 g/moleCO₂: 44 g/moleH₂O: 18 g/molethen by stoichiometry of the reaction, the following amounts of mass participate in the reaction:
C₃H₈: 1 mole* 44 g/mole = 44 gO₂: 5 moles* 32 g/mole= 160 gCO₂: 3 moles* 44 g/mole= 132 gH₂O: 4 moles* 18 g/mole= 72 gThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
To determine the limiting reagent, it is possible to use a simple rule of three as follows: If by reaction stoichiometry 44 grams of propane react with 160 grams of oxygen, 7.2 grams of propane react with how much mass of oxygen?
[tex]mass of oxygen=\frac{7.2 grams of propane*160 grams of oxygen}{44 grams of propane}[/tex]
mass of oxygen= 26.18 grams
But 26.18 moles of O₂ are not available, 12.5 grams are available. Since you have less mass than you need to react with 7.2 grams of propane, oxygen O₂ will be the limiting reagent.
Then you can apply the following rule of three: if by stoichiometry of the reaction 160 grams of oxygen form 132 grams of carbon dioxide, 12.5 grams of oxygen will form how much mass of carbon dioxide?
[tex]mass of carbon dioxide=\frac{12.5 grams of oxygen*132 grams of carbon dioxide}{160 grams of oxygen}[/tex]
mass of carbon dioxide= 10.3125 grams
10.3125 grams of carbon dioxide will be formed.
How does the length of a lunar month compare to the average length of a month in a standard 365-day calendar?