Find the molarity of a solution made by dissolving 12.5 g sodium carbonate in 500.0 mL total solution
Answer:
The molarity of a solution is "25 M".
Explanation:
The given values are:
Moles of solute,
= 12.5 g
Volume of solution,
= 500 mL
i.e.,
= 0.5 L
Now,
The molarity will be:
= [tex]\frac{Number \ of \ moles \ of \ solute}{Volume \ of \ solution}[/tex]
On substituting the values, we get
= [tex]\frac{12.5}{0.5}[/tex]
= [tex]25 \ M[/tex]
What is the name of the test used to find out the gas produced when calcium reacts with sulfuric acid? *
1.Lime Water
2.lighted splint
3.litmus paper
4.glowing splint
Answer:
1
Explanation:
calcium react with sulphuric acid to produce carbon dioxide which turns lime water milky
Which of the following best describes the difference between metals and nonmetals?
a
metals tend to have low melting points and nonmetals have high melting points
b
nonmetals are more reactive than metals
c
metals are brittle and dull
d
metals have high melting points and are malleable, whereas, nonmetals have lower melting points and tend to be brittle.
Answer:
the answer is d.
Explanation:
because metals are refers to natural elements that are hard, shiney, opaque, and dense. nonmetals implies thise chemical substances that are soft, non-shiney, transparent and brittle.
Question 2 please I mark brainliest
Answer: C is the answer
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Answer:
1. An incline plane is a flat plan put at a positive angle with the ground (assuming the ground is horizontal)
2. Work equals force times distance. And since the hypotenuse of a triangle (the ramp) is longer than the opposite side (equivalent to lifting an object vertically), the increased distance decreases the force needed to do a certain amount of work.
3. We usually use incline planes to elevate large objects. Since it takes less force to move certain things up inclines rather than picking them up, it is much simpler to move an object up an incline.
4. You could decrease the force by making the plane's angle with the ground smaller.
5. I don't know; I wasn't in your class :)
6. Ramps, wheelchair entrances, inclined rooves etc.
7. No. A plane has to be relatively flat; therefore stairs are neither a plane, nor an inclined plane.
If the knot (W) travels 2 meters in 1 second, we say it has a _____ of 2 m/s.
Answer:
we say it has a speed of 2m/s
List and Describe the two groups of clastic sedimentary rock.
Answer:
Clastic sedimentary rocks are formed from rock fragments or clasts; chemical sedimentary rocks precipitate from fluids, and biochemical sedimentary rocks form as precipitation from living organisms.
Sedimentary rock is classified into two groups based on how they form. They are clastic and chemical. Clastic sedimentary rock is formed as bits of weathered rock become cemented together. Because all kinds of rock are subject to weathering many different minerals can make up this group of rocks.
What is the mass of 3.4 moles of NaCl?
Answer: 140.4 grams. One mole would be 58.5 grams, or 23 (the atomic mass of sodium) + 35.5 (the atomic mass of chlorine)
Explanation:
Answer:
3.4 * 58.5 = 198. 9 grams
Why are most anions basic in H2O? Give formulas of four anions that are not basic.
Answer:
The anions that can act as bases (conjugate bases of weak acids) have the capability to hydrolyse water and produce OH− ions. Cl−, Br−NO−3, SO2−4 are all conjugate bases of strong acids that don't have the capability to hydrolyse water and so they aren't basic.
Explanation:
How many meters per second is 1.61kilometers per minute?
Answer:
26.83333
Explanation:
Which physical property will change if the amount of the sample changes?
Answer:
Extensive Properties
Explanation:
A physical property that will change if the amount of matter changes. Change in which the matter's physical appearance is altered, but composition remains unchanged. Solid is distinguished by a fixed structure. Its shape and volume do not change.
what is the formation of the solar system?
Answer:
Mercury
Mars
Venus
Earth
Neptune
Uranus
Saturn
Jupiter
Explanation:
In words, how does the volume change when the temperature of an object changes?
Atomic masses of element
Hydrogen and carbon
Answer:
Atomic mass of Hydrogen is 1.00784 u
Atomic mass of Carbon is 12.0107 u
Explanation:
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What pigment, only present in plants, makes photosynthesis possible?
Answer:
la photosintesis viene de la clorofila de la planta
Determine the correct set-up below to determine what mass, in grams, of N2 is needed to completely react with 105 g F2 ?
Answer:
C: 1 mol F2/38 g F2
Explanation:
The reaction equation is;
N2 + 3F2 = 2NF3
Now, to know how many grams, of N2 is needed to completely react with 105 g F2 and since the molar mass of N2 is 28.02 g/mol, Molar mass of F2 is 38 g/mol, number of moles attached to N2 and F2 in the reaction are 1 and 3 moles respectively, then we will have;
105 g F2 × 1 mol F2/38 g F2 × 1 mol N2/3 mol F2 × 28.02 g N2/1 mol N2
Option C is Thus correct
An element ceases to be that element if the particle it loses or gains is a neutron.
True or false
Answer:
False
Explanation:
An element is named according to the number of protons in the nucleus. If it gains or loses a neutron, it becomes a different isotope of the same element.
The given statement is false.
Answer:
FALSEExplanation:
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How many moles of gas would be present in a gas trapped within a 37.0 L vessel at 80.00C at a pressure of 2.50 atm
go here is the answer key
http://msschmidly.weebly.com/uploads/2/6/2/0/26201624/gases_review___calculations.pdf
According to ideal gas equation, there are 271472.7 moles of gas present in a gas trapped within a 37.0 L vessel at 80.0°C at a pressure of 2.50 atm.
What is mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons .Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Substitution of values in ideal gas equation gives,n= 2.5×37/8.314×353=271472.7 moles.
Learn more about moles,here:
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List the three types of heating and describe how the ocean works.
Answer:
TYPES OF HEATING: There are three types of heat transfer: conduction, convection, and radiation.
OCEAN ANSWER: Ocean currents are driven by a range of sources: the wind, tides, changes in water density, and the rotation of the Earth. The topography of the ocean floor and the shoreline modifies those motions, causing currents to speed up, slow down, or change direction.
Explanation:
the answer is basicly the person who answered above me
Explanation:
Can someone please fill in the blanks?
Answer:
g3gegsgehshhwwjwuwuwu2euyeeyeyyy
Answer:
helium formula He
Ammonia formula NH3
methane formula CH₄
chlorine formula Cl-
Explanation:
What is T in the equation G = H - TS?
A.
The temperature in kelvins at which the reaction is happening
B.
The temperature in degrees Celsius at which the reaction is run
C.
The temperature required to make the reaction spontaneous
D.
The temperature at which the Gibbs free energy is zero
The answer is A.
The T in the equation G = H - TS is the temperature in kelvins at which the reaction is happening. The correct option is A.
What is temperature?Temperature is the measurement of the coldness or hotness of a body. The SI unit of the temperature is kelvin and Celsius. The high-temperature regard hotness and the low temperature means a cold area.
G = H – TS is the equation to calculate Gibbs free energy.
Where G = Gibbs free energy
H = enthalpy
T = temperature
S = entropy
Gibbs free energy is the total amount of energy that is taken to do the work in a closed system. The entropy is the total amount of energy that is not useful for work. The temperature is the variable in this equation.
Thus, the correct option is A. The temperature in kelvins at which the reaction is happening.
To learn more about temperature, refer to the link:
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Answer:
hi again
I : Television. Satellites send television signals directly to homes
II : gravity
Answer:
1) I would say television and streaming channels. 2) gravity
Explanation:
increase food supplies in an ecosystem decrease competition because the competing organsims would
I have 8 valence electrons, completely nonreactive, and my family contains Helium that is used to fill balloons! I must be a...
a
metal
b
nonmetal
c
metalloid
d
noble gas
Answer:
Noble gas
Explanation:
Noble gases are complete octets ( have 8 valence electrons) Helium is a member of this family.
the firm outer covering of a plant cell is a
A.cell body
B.cell membrane
C.cell wall
d.cell structure
Answer:
it is the cell wall :)
Explanation:
Answer: The answer is C
Why does a Lewis structure of a covalent molecule show only the valence electrons?
Answer:
Only the valence shell are shown in the Lewis electron dot structures because, the chemical reactivity of an atom of an element is determined by the valence electrons of the atom and not by all the electrons of the atom including the inner electrons.
Explanation:
Lewis electron dot structures are structures that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
In the Lewis symbol for an atom, the chemical symbol of the element is written, and the valence electrons of the atom are represented as dots surrounding it. Only the electrons in the valence shell are shown using the Lewis electron dot structures.
Lewis structures for molecules show each atom and its position in the structure of the molecule using its chemical symbol. Dots or lines are drawn between atoms to show the electrons that are involved in the chemical bonding between the atoms in the molecule. Valence electrons in each atom that are not involved in bonding known as lone pairs, are represented as pairs of dots, and are placed next to each atom bearing the electron.
Electrons that are not in the valence level are not shown in the Lewis electron dot structures . This is because, the chemical reactivity of an atom of an element is determined by the valence electrons of the atom and not all the electrons of the atom including the inner electrons.
If the Temperature exerted on a sample of gas is increased from 273K to 410K, and the initial pressure is 1.3317 atm what is the final pressure in atm?
Answer: 2.00 atm
Explanation:
P1/T1 = P2/T2
1.3317/273 = P2/410
P2 = 2.00 atm
How can you model the movement of a primary wave?
Answer:
P-waves (primary or compressional waves) are longitudinal or compression waves, able to move through solids, liquids, and gases at speeds ranging between 300-5,000 metres per second. As they travel through rock, they move particles back and forth in the same direction that the wave is moving
Explanation:
Need help too please I would really appreciate it
Answer:
it's O2 since the oxygen has 6 valence electrons and it can make 2 covalent bonds
Question number 12 I need help
Answer: Its B.
Explanation:
i cant quite explain