Answer:
this is the answer pls give me brainliest
The three ways thermal energy is transferred are;
1) Conduction
2) Convection
3) Radiation
Explanation:
1) The conduction of the heat from the open flame to the marshmallow is through the direct contact of the flame with the marshmallow, such that the flame the region of the combustion reaction, that produces light and heat touches the marshmallow
2) The convection process is the transfer of heat from the rising heated combustion products, as well as the heated air that rises from the flame
3) The radiation heat transfer is the transfer of the heat from the fire to the marshmallows directly by the heat the moves in the form of electromagnetic waves at temperatures above 1000 K, without the need for a medium, such that the marshmallow can be heated by the heat coming from side of the flame.
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
Is freezing depression dependent on having a salt solute, or can non-ionic particles also have an affect on the freezing point of a liquid? Explain your thinking.
Answer:
It is not dependent on the salt solute at all but the solute does have an affect.
Explanation:
in the equation you maybe aware of the I factor which represents the ions present in the solution. a non ionic will always have a I value of 1 a ionic can be 2 like in NaCl. What this means that all non ionic will lower the temperature depression but ionics will have a greater affect because for example salt breaks into Na and Cl will essentially hae more impurities than glucose which doesnt dissociate and will have a I value of 1
Which two are isotopes of one another?
a. Atoms 1 & 2
b. Atoms 2 & 3
c. Atoms 1 & 3
d. Atoms 1 & 4
When magnesium is added to hydrochloric acid, a gas is formed. Explain what happens in the reaction, how the gas is collected and how it could be tested to prove what it is.
Answer:
Explained below.
Explanation:
Formula when magnesium reacts with hydrochloric acid is given by;
Mg(s) + 2HCl(aq) = MgCl2(aq) + H2(g)
So, from the equation, we can see that the gas formed is hydrogen.
This hydrogen gas is collected by a method known as water displacement.
This gas can be tested for by holding a burning splint near to the top of the test container. The resulting effect should be a high pitched pop sound because the hydrogen gas will react with the oxygen gas in the air to result in a small explosion.
If the reaction produces 400.0 mL of 1.5 M MgCl2, how many moles of HCl reacted?
(A) 0.30 moles
(B) 0.60 moles
(c1.20 moles
(D) 2.40 moles
The number of moles of HCl produces 400.0 mL of 1.5M MgCl₂ is equal to 1.20 moles. Therefore, option (C) is correct.
What is a mole?A mole can be defined as a standard unit that is used to find a huge number of quantities of molecules, atoms, ions, or other particular particles.
The number of entities in one mole was found to be equal to 6.023 × 10²³ which is called Avogadro’s constant.
The chemical equation of magnesium and HCl is:
Mg (s) + 2HCl (aq) → MgCl₂ (aq) + H₂(g)
The volume of the MgCl₂ solution, V = 400 ml = 0.4 L
The concentration of MgCl₂ = 1.5 M
The number of moles of MgCl₂ = 1.5 × 0.4 = 0.6 moles
One mole of MgCl₂ is produced from HCl = 2
0.6 moles of MgCl₂ is produced from HCl = 2 × 0.6 = 1.20 moles
Therefore, 1.20 moles of HCl will be reacted to produce 0.6 moles of MgCl₂.
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2KMnO4 + 16HCl → 2KCl + 2MnCl2 + 8H2O + 5Cl2 If 6.0 moles of KCl are produced, how many moles of HCl were reacted?
Answer:
2x - 9y = 23
5x - 3y = -12x - 9y = 23
5x - 3y = -1
Explanation:
How many moles of gas does it take to occupy 120 liters at a pressure of 2.3 atmospheres and a
temperature of 340 K?
What particle revolves around the center of the atom? What is its Charge?
Answer:
Electrons, with a charge of -1.
Explanation:
The nucleus of the atom is composed of protons and neutrons.
The nucleus is where the bulk of the mass of an atom is found.
Electrons orbit the nucleus in various energy levels.
Protons have a charge of +1, neutrons have no charge, and electrons have a charge of -1.
A double-replacement reaction takes place when aqueous cobalt (III) chloride reacts with aqueous lithium hydroxide. One of the products of this reaction is
What is the chemical formula of stannic nitride?
Answer:
Stannic nitride, Sn3N4
Explanation:
plz i need help
eggs:
ranch dressing
windex
Answer:
Egg is heterogeneous.
Ranch Dressing is heterogeneous
Windex is homogeneous.
A substance has a mass of 50g and a volume of 2mL. What is the density?
What is the formula you will use?
What is the answer?
Answer:
[tex]\boxed {\boxed {\sf d= 25 \ g/mL}}[/tex]
Explanation:
Density is equal to mass over volume.
[tex]\rho=\frac{m}{v}[/tex]
This is the formula used.
The mass is 50 grams and the volume is 2 milliliters.
[tex]m= 50 \ g \\v= 2 \ mL[/tex]
Substitute the values into the formula.
[tex]\rho =\frac{50 \ g }{2 \ mL}[/tex]
Divide.
[tex]\rho= 25 \ g/mL[/tex]
The formula used is ρ=m/v and density is 25 grams per milliliter.
If a scientist did an experiment to see how adding sugar to plant water would affect the plant’s growth, what would be the dependent variable
sugar would be a dependent factor
How many grams are 3.01 x 10^23 molecules of methane (molar
mass = 16.04 g/mol)?
Answer:
8.02
Explanation:
what is name of each shape
Answer:
I am so sorry I do not know this
Explanation:
The student who answers the riddle will get the prize ? underline pronoun
.
answer:
the student who answers the riddle will get the prize
explanation:
who is the pronouna pronoun is something that substitutes for a nounWhat would happen if you put a balloon on earth And brought it to the moon with lower atmospheric pressure it would do what?
1: Expand
2: Shrink
3: Stay the same size with the same internal pressure
4: Stay the same size but with a different internal pressure
Answer:
I think it's 1
Explanation:
As the balloon rises the gas inside the balloon expands because the pressure surounding the balloon drops.
Enid claims that two concentrated solutions will have a lower reaction rate
than two dilute solutions. Which statement tells whether Enid is right and
gives a correct explanation?
O A. She is right, because the dilute solutions give the molecules more
room to move around and align themselves well for collisions.
B. She is right, because the dilute solutions give the molecules more
space to move more quickly.
C. She is not right, because there will be more successful collisions
between reactants in the dilute solutions.
D. She is not right, because there will be more successful collisions
between reactants in the concentrated solutions.
D. She is not right, because there will be more successful collisions
between reactants in the concentrated solutions.
Enid claims that two concentrated solutions will have a lower reaction rate than two dilute solutions. The statement tells that whether Enid is right given as ". She is not right, because there will be more successful collisions between reactants in the concentrated solutions.
So, option D is correct one.
What is concentrated solution?A solution which has relatively large amount of dissolved solute.
Since, rate of the reaction depends upon collision between reactants molecules. Due to presence of large amount of dissolved solute in concentrated solution, more collision is takes place between solute molecules. So, rate of reaction of concentrated solution is more as compare to dilute solution.
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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
true or false for this question?
Answer:
False, i think
Explanation:
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
Describe how both genes and the environment can affect the growth of organisms
Answer:
The environment can affect an organisms through natural evolution. Example: Spotted moths camouflage with the bark on trees, but black moths do not. So the black moths are eaten and the spotted moths survive. The white moths then pass on their genes to their offspring, so their offspring will also be spotted. Eventually most moths will be spotted. But when the industrial revolution occured, the bark of the trees changed to a darker colour. Therefore the spotted moths were easily seen by predators and were eaten. But the black moths blended in with the bark so they survived. The black moths then passed on their genes to their offspring so most of the moth population had black wings.
Give the RNA complementary strands of the original strands listed below:
CGAACGTTA
GGCAAATTT
AUGGCAUUA
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:
An ion contains 20 electrons and has a charge of +3.From which element was the ion formed?
Answer:
its chlorine
Explanation:
beacuse 3+ is a positive ion so we have 20 electrons - 3 electrons=17elecrons
an element with 17 electrons is cl
2. Calculate the [H+] in the following solutions, given their pH, and identify the solution as acidic, basic or neutral.
a) pH = 2.5
b) pH = 11.7
c) pH = 6.8
d) pH = 3.31
Answer:
a) acidic; [H+] = 10^-2.5 = 3 x 10^-3
b) basic; [H+] = 10^-11.7 = 2 x 10^-12
c) slightly acidic (almost neutral); [H+] = 10^-6.8 = 1.6 x 10^-7
d) acidic; [H+] = 10^-3.31 = 4.9 x 10^-4
Explanation:
pH < 7 is acidic; pH > 7 is basic; pH = 7 is neutral
[H+] = 10^-pH
A is acidic, B is basic, C is slightly acidic, and D is acidic.
What is pH?
pH, quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
a) Acidic; [[tex]H^+[/tex]] = [tex]10^-^2^.^5[/tex] = [tex]3 X 10^-^3[/tex]
b) Basic; [[tex]H^+[/tex]] = [tex]10^-^1^1^.^7[/tex] = [tex]2 X 10^-^1^2[/tex]
c) Slightly acidic (almost neutral); [[tex]H^+[/tex]] = [tex]10^-^6^.^8[/tex]= [tex]1.6 X 10^-^7[/tex]
d) Acidic; [[tex]H^+[/tex]] = [tex]10^-^3^.^3^1[/tex]= [tex]4.9 X 10^-^4[/tex]
pH < 7 is acidic; pH > 7 is basic; pH = 7 is neutral
Hence, a is acidic, b is basic, c is slightly acidic, and d is acidic.
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what is the density of a gas at STP that has a molar mass of 50.0 g/mol?
Answer:
2.232 g/L
Explanation:
Assuming 1 mol, volume at STP is 22.4 L so you simply divide 50g by 22.4 L to get density
The density of the given gas is required.
The density of the gas at STP is 2.232 g/L.
M = Molar mass of gas = 50 g/mol
1 mole of any gas at STP occupies 22.4 L.
V = Volume per mole = 22.4 L/mol
Density is given by
[tex]\rho=\dfrac{M}{V}\\\Rightarrow \rho=\dfrac{50}{22.4}\\\Rightarrow \rho=2.232\ \text{g/L}[/tex]
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what is the name of the second halogen
Answer:
flourine
Explanation:
im not sure the answer
When do scientists believe matter formed
Can you identify a sample from a living organism by examining it under a microscope? Yes or No