answer
Gives brown colour gas
What type of energy is transmitted from the Sun to Earth through space?
Answer:
solar energy
Explanation:
A cylinder, with a piston pressing down with a constant pressure, is filled with 2.10 moles of a gas (n1), and its volume is 46.0 L (V1). If 0.700 mole of gas leak out, and the pressure and temperature remain the same, what is the final volume of the gas inside the cylinder?
Answer:
The volume is [tex]V_2 =15.33 \ L[/tex]
Explanation:
From the question we are told that
The number of moles of the gas is [tex]n_1 = 2.10 \ moles[/tex]
The volume of the gas is [tex]V = 46.0 \ L[/tex]
The of moles of the gas that leaked is [tex]n_2 = 0.700 \ mol[/tex]
Generally from the ideal gas law
[tex]PV = nRT[/tex]
Generally at constant pressure and temperature
[tex]\frac{V}{n} = constant[/tex]
So [tex]\frac{V_1 }{n_1} = \frac{V_2 }{n_2}[/tex]
=> [tex]V_2 = \frac{ V_1 * n_2 }{ n_1}[/tex]
=> [tex]V_2 = \frac{ 46.0 * 0.700 }{ 2.10 }[/tex]
=> [tex]V_2 =15.33 \ L[/tex]
2H20--12H2 + O2
How many moles of H2 are produced when 2.54 moles of H2O reacted?
Answer:
2.54mole of H₂
Explanation:
The reaction expression is given as:
2H₂O → 2H₂ + O₂
Given;
Number of moles of H₂O = 2.54moles
Unknown:
Number of moles of H₂ produced = ?
Solution:
To solve this problem, we use the concept of mole comparison. Now from the reaction expression, we know that;
2 mole of H₂O will produce 2 mole of H₂
2.54 mole of H₂O will then produce 2.54mole of H₂
What is the different between stereotyping someone and judging them? paragraph in length please
Answer:
Stereotyping provides humans with the ability to quickly sort out patterns in a randomly diverse world filled with people of every size, shape, gender, age, color, and sexual orientation. And it’s just a quick first pass, nothing more
d) velocity ratio =_________ Iload distance
Answer:
velocity ratio is defined as the ratio of distance moved by effort and load in the same time interval
Explanation:
Match the intermolecular force with the physical property that will result
Answer:
Intermolecular forces are the forces that bind two molecules together. Physical properties are affected by the strength of intermolecular forces. Melting, boiling, and freezing points increase as intermolecular forces increase. Vapor pressure decreases as intermolecular forces increase. Hope this is what your looking for!
Explanation:
Brainliest please?
What is another name for a row on the periodic table?
Answer choices :
Group
Period
Family
Transition Metals
One way to represent a model of an atom is in a drawing. What is another way to show an atomic model?
I think by writing electronic configuration.
Another way of representing an atomic model is the use of periodic table
There are different ways in which an atom can be modelled and some of these methods includes:
The use of the periodic tableThe Bohr- Rutherford modelThe Lewis structure IonsAll the ways listed above can be used to model/represent an atom graphically ( drawing ). while the periodic table can be used to model an atom into its element without drawing. The periodic table makes use of valance numbers of the atoms and chemical similarities between atoms when modeling an atom.
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2. DETERMINE THE TEMPERATURE AT
WHICH NIO GRAMS OF POTASSIUM
NITRATE DISSOLVE IN 100 GRAMS OF
WATER
Answer:
20 degrees Celsius
Explanation:
Which liquid has the weakest intermolecular forces?
Answer:
Oil- Only London Dispersion Forces (the weakest intermolecular force)
Water- London Dispersion, Dipole-Dipole, and Hydrogen Bonding
PLEASEEE answer correctly! I will give u 10pts and brainleist if u get it right please:) (SCIENCE)
Answer:
The answer is 2
Explanation:
when viewed from earth number 2 would be a waning gibbous
1. An element is defined by the number of:
Electrons
Protons
Neutrons
Chemical Bonds
lons
Answer:
The correct answer for this question would be B) Protons
Explanation:
I got it right on my test (Can I have brainlyest)
If there are 400 radioactive atoms in a sample, how many will remain after four half-lives have passed?
Enter the exact number as your answer. Do not spell out the number.
Answer:
25 atoms
Explanation:
Given data:
Total number of atoms = 400 atom
Atoms remain after 4 half lives passed = ?
Solution:
At time zero = 400 atom
At first half life = 400 atom/2 = 200 atom
At 2nd half life = 200 atom/2 = 100 atom
At 3rd half life = 100 atom/2 = 50 atom
At 4th half life = 50 atom/2 = 25 atom
Thus, 25 atoms are remained after 4 half lives.
25 atoms of the radioactive atoms will remain after 4 half lives.
Given in the question,
Initial amount of a radioactive element = 400 atomsNumber of half lives = 4Expression for the amount remaining of a radioactive element after 'n' half lives is given by,
[tex]N=N_0(\frac{1}{2})^n[/tex]
Here, [tex]N_0=[/tex] Initial amount
[tex]n=[/tex] Number of half lives
By substituting the vales of [tex]N_0[/tex] and [tex]n[/tex] in the question,
[tex]N=400(\frac{1}{2})^4[/tex]
[tex]=\frac{400}{16}[/tex]
[tex]=25[/tex]
Therefore, 25 atoms of the radioactive atoms will remain after 4 half lives.
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Part C
In the Options window of the simulation, select Pie to show the pie chart. In the window labeled Start with how many, use the up arrows to add 40 particles of A and 40 particles of BC. Then press the Begin experiment button. Wait a few seconds for the reaction to come to equilibrium, and then click pause near the bottom of the screen.
Study the graph on the left. The green line shows total average energy. The blue line shows the amount of potential energy possessed by the reactants and the products. Recall that substances most readily take the form in which they have the least potential energy. The amount of potential energy can be adjusted, affecting the outcome of the reaction. Recall that in the initial experiment for synthesizing ammonia, only about 20% of the reactants were converted to the products.
Click the Play arrow to resume the simulation. Then adjust the potential energy curve so the proportion of reactants to products is roughly the same as the proportion in the initial experiment. Adjust the center slider up or down so there’s a bump in the middle of the energy curve. The bump represents the energy the particles must have to react. Take a screenshot of the energy curve, and use the Insert Image button to paste it in the answer space.
Answer:
Explanation:
I'm not going to lie, I think I did this completely wrong. But you can use this. I was completely lost on this assignment.
Answer:
I believe this is the answer
Explanation:
Which statement best explains what happens to a leaf when it has lost much-needed water?
Answer:
its turgor pressure decreases
Explanation: This is also important because this function regulates water loss within the plant. Lower turgor pressure can mean that the cell has a low water concentration and closing the stomata would help to preserve water. :-)
When a leaf loses much-needed water, its turgor pressure would decrease. Hence Option A is Correct
What is Turgor pressure ?Turgor Pressure is created in the cells of a leaf when there is enough water. The water stretches the cell membrane outward, creating a kind of pressure.
When the cells lose water, the cell membrane shrinks inward and loses the supporting pressure.
Thus, the turgor pressure created by the presence of water is lost by the absence of water.
The absence of water also affects the rate of photosynthesis and transpiration negatively and not positively. A leaf losing water has no bearing on the atmospheric pressure.
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What is the chemical formula for zinc (II) phosphate?
Answer:
Zn^3(PO4)2
Explanation:
thats the formula
The chemical formula for compound zinc (II) phosphate is Zn₃(PO₄)₂.
Zinc (II) phosphate is an inorganic chemical compound that is made up of zinc cations and phosphate anions .The chemical formula for zinc (II) phosphate is obtained by combining three zinc cations with two phosphate anions to achieve the neutral charge.
Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
Thus, chemical formula for compound zinc (II) phosphate is Zn₃(PO₄)₂.
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what mining biodivirsity
Answer:
Explanation:
Mining affects biodiversity at multiple spatial scales (site, landscape, regional and global) through direct (i.e. mineral extraction) and indirect processes (via industries supporting mining operations, and external stakeholders who gain access to biodiversity-rich areas as the result of mining).
Which phrase accurately describes the location of Africa? O mostly in the eastern hemisphere mostly south of the Tropic of Capricorn O borders the Pacific Ocean O lies north of Europe
Answer:
mostly in the eastern hemisphere mostly south of the Tropic of Capricorn
Explanation:
The statement which best describes the location of Africa is that it is found
mostly in the eastern hemisphere.
Africa is a continent which comprises of countries such as Nigeria, Ghana,
Kenya etc. It is bounded on the north by the tropic of cancer and towards
the south of the tropic of capricorn.
Africa also lies in the eastern hemisphere and is found to the south of the
European continent.
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What type of reaction will occur with the following reactants?
CaS + NaCl -->
A) double replacement
B) decomposition
C) synthesis
D) single replacement
Answer:
A) double replacement
Explanation:
Chemical equation:
NaCl +CaS → Na₂S + CaCl₂
Balanced chemical equation:
2NaCl +CaS → Na₂S + CaCl₂
The given reaction is double replacement reaction in which cation and anions of each reactant exchange with each other.
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AD +CB
Other options are incorrect because,
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
AB → A + B
Single replacement:
It is the reaction in which one elements replace the other element in compound.
AB + C → AC + B
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
Which one has more Thermal Energy? A cup of boiling water or a bathtub of warm water? Explain! Please answer if you can, thank you!! P.S this is science but i just put it as chemistry?
Answer:
See explanation
Explanation:
The thermal energy of a substance is affected both by its mass and by its temperature. Thermal energy is defined as the total kinetic energy of all particles in an object.
Even though the cup of water has a higher temperature, the bathtub has more thermal energy because it contains much more mass of water compared to the cup. It will release more thermal energy to the surroundings compared to the cup of boiling water.
The bathtub of warm water has a higher total thermal energy due to its bigger volume, but the cup of boiling water has a higher average kinetic energy per particle.
The thermal energy of a cup of boiling water is greater than that of a warm bathtub. The sum of all the kinetic energies of the particles in a substance is its thermal energy. The temperature of boiling water is higher than that of warm bathwater. The average kinetic energy of the particles is measured by temperature. The average kinetic energy of the particles in a cup of boiling water would be higher than that of the warm water in a bathtub, which is normally between 38 and 45 degrees Celsius (100 and 113 degrees Fahrenheit), because water has a boiling temperature of 100 degrees Celsius (212 degrees Fahrenheit).
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Identify the type of reaction: 2AgCl + BaBr2 -> 2AgBr + BaCl2
A) decomposition
B) combustion
C) double replacement
D) single replacement
Answer:
C
Explanation:
Just look at the reactants.
2AgCl + BaBr2
The first reactant is made of 2 elements.
The second reactant is made of 2 elements.
It can't be a decomposition. At this level there is only one reactant made of 2 elements. Something like
2MgO ===> 2Mg + O2
is a decomposition. One compound breaking down into 2 elements Mg and O.
It can't be a combustion. One of the reactants in a combustion is oxygen. Those equations look like
C3H8 + 5O2 ==> 3CO2 + 4H2O
That would be what a combustion looks like
It can't be a single replacement. They look like
Mg + CuO ===> Cu + MgO
There are elements on both sides of the reaction.
that leaves a double replacement which I wrote about how you distinguish it.
Answer:
c
Explanation:
An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. What is its mass number? *
Answer:
26.981539
Explanation:
Please answer correctly !!!!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!!!!!!
Answer:
i dont have an answer for sure because it doesnt specify WHAT its energy chang occurs but i think its physical change
Explanation:
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
examples of chemical change:
burning a fire
boiling an egg
digestion
examples of physical change:
melting ice
rusting
breaking a pencil
hope i helped!!
Why do you see different stars in spring’s night sky than in fall’s night sky? Explain.
Answer:
If observed through the year, the constellations shift gradually to the west. This is caused by Earth's orbit around our Sun. In the summer, viewers are looking in a different direction in space at night than they are during the winter.
Explanation:
Answer:
there it the fact that the earthisspinningand so the starsare staying still and we are spinning
The chemical formula for the ionic compound aluminum sulfite is Al2(SO3)3. Explain why there are 2 cations for every 3 anions in this compound.
my mom !!!Explanation:
Musscle man
19. Luke wants to create an aqueous solution that conducts electricity. Which of the following compounds should
he use?
a) KNO3
b) C12H22O11
c) C2H5OH
d) NH4OH
Answer:
I think b) C12H22O11.
Hope this answer is helpful for u.
what are the three types of nuclear decay or reactions?
Answer:
alpha decay, beta decay, gamma decay
The diagram above represents the melting of H2O(s). A 2.00mole sample of H2O(s) at 0°C melted, producing H2O(l) at 0°C. Based on the diagram, which of the following best describes the amount of heat required for this process and the changes that took place at the molecular level?
Heat : 12 kJ, to maintain hydrogen bonds
Further explanationGiven
A 2.00mole sample ⇒ n = 2 mol
H₂O(s) at 0°C melted, producing H₂O(l) at 0°C
Required
the amount of heat required
the changes that took place
Analysis
Conversion of mol to mass
Use formula of Heat :
Q = mLf (melting/freezing)
Lf=latent heat of fusion (for water=334 J/g)
Solution
mass H₂O(MW=18 g/mol) :
[tex]\tt mass=2\times 18=36~g[/tex]
Heat required :
[tex]\tt Q=36\times 334=12024~J\approx 12~kJ[/tex]
The absorbed heat is used to maintain hydrogen bonds in water molecules (there are two hydrogen bonds per molecule)
Paraphrase
The amount of heat required : 12 kJ, and to maintain hydrogen bonds
Part A Read each sentence. Write the letter of the correct answer on the line.
1. Which of the following would result in a chemical change?
A boiling water
C tearing paper
B burning wood
D melting wax
Identify the number of protons and electrons
in fluorine and iodine.
The element fluorine helps prevent tooth decay and is found in many toothpastes,
Atomic number: 9
Answer:
Fluorine has 9 protons and 9 electrons
Iodine has 53 protons and 53 electrons
Explanation:
Fluorine has 9 protons and 9 electrons and Iodine has 53 protons and 53 electrons.
What is an electron?An electron is defined as a subatomic particle which is charged negatively either bound to an atom or not it means they are freely found. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.
The nature of electron is free it means they are present freely in nature and an atom consist of electron.The main function of electron is that function of negatively- charged component of an atom.
The electrons are primary function of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.
Therefore, Fluorine has 9 protons and 9 electrons and Iodine has 53 protons and 53 electrons.
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