Answer:
CaSO4. 2H2O
Explanation:
mass of hydrated salt = 10 g
mass of anhydrous salt = 7.90 g
molar mass of hydrated salt = 136 + 18x g/mol
molar mass of anhydrous salt = 136 g/mol
mass of hydrated salt/molar mass of hydrated salt = mass of anhydrous salt/molar mass of anhydrous salt
10.0/136 + 18x = 7.90/136
136 * 10 = 7.90 (136 + 18x)
1360 = 1074.4 + 142.2x
1360 - 1074.4 = 142.2x
285.6 = 142.2x
x = 285.6 / 142.2
x = 2
Hence the empirical formula of the compound is CaSO4. 2H2O
Read the scenario, then answer the questions. A 2 kg ball is thrown upward with a velocity of 15 m/s. What is the kinetic energy of the ball as it is being thrown? J
Answer:
225 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 2 \times {15}^{2} \\ = 1 \times 225 \\ = 225 \: \: \: \: \: \: \: \: [/tex]
We have the final answer as
225 JHope this helps you
Answer:
225 J for both answers
Explanation: :)
How many moles are in 5.32 x 1020 atoms
of copper?
What is the answer but in numbers ?
Answer is 1.41 x 10 with the exponent of 24, atoms
Explanation : Look at the picture i attached.
if you cant see the image please let me know. last time i put an image someone said its blurry.
Answer:
no , it's clear like a mirror
there's is nothing blurred
I need help with my homework i don't understand nothing
Answer:
ok so im gonna go and do some for your latest questions then if thats alright with you
Explanation:
i need points so im trying to help as many people as i can before the end of the day.
but you have to make the questions forst so i can help you understand them
50% by mass of a 2.2 moles
mixture of He and Ar gasses .
Calculate the mole number of He
in the mixture?
Mol He in the mixture = 2
Further explanationGiven
50% by mass
2.2 moles of mixture
Required
The mole number of He
Solution
50% by mass⇒ mass of He : mass of Ar = 1 : 1
Mol He = 2.2 - mol Ar
mass He = mass Ar
mol x MW He = mol x MW Ar
(2.2-mol Ar) x 4 = mol Ar x 40
8.8 - 4 mol Ar = 40 mol Ar
8.8 = 44 mol Ar
mol Ar= 0.2
mol He = 2.2 - 0.2 = 2
Convert to standard notation.
3.94 x 10^7
Answer:
Standard Notation:39,400,000
Explanation:
3.94*10^7= 39,400,000
the answer is 39400000x
1) Why are most fossils found in sedimentary rocks? *
10 points
A. Sedimentary rocks are not very old.
B. Organisms live only in areas with sedimentary rock
C. Organisms can be preserved in sedimentary rock
D. Sedimentary rocks are found only if the surface of the ground.
Answer:
i think it might be c
Explanation:
i'm not positive though
Answer:
C
Explanation:
Sedimentary rocks can contain fossils because, unlike most igneous and metamorphic rocks, they form at temperatures and pressures that do not destroy fossil remains.
Draw a Lewis structure showing how two oxygen atoms share two pairs of electrons.
Answer:
See explanation
Explanation:
A Lewis or dot structure shows the electrons on the valence shells of the bonding atoms as dots.
The method was developed by Sir G.N Lewis.
Oxygen is a diatomic molecule as shown in the image attached to this answer. There are two unshared electrons on each oxygen atom as well as four shared electrons
The sharing of electrons between the two oxygen atoms results in the completion of the octet and thereby stabilizing the atoms.
Oxygen has been a group 6A element consisting of 6 valence electrons. In order to attain the stable configuration, the atom of oxygen has been required to gain two electrons.
The oxygen shares its electrons with another oxygen atom and forms a covalent bond. The resulted bond has been able to stabilize the structure.
The image attached shows the lewis dot structure of the oxygen atom. The sharing of electrons between the two oxygen atoms results in the completion of the octet and thereby stabilizing the atoms.
For more information about the lewis dot structure, refer to the link:
https://brainly.com/question/4144781
convert 0.0054 Megasec (Msec) to Hectosec (Hsec)
i'm very confused with conversions in general but if someone could solve this and explain a little that'd be SO SWAG.
What is different about the atomic structure of the oxygen isotopes?
Answer:
Each isotope of oxygen contains 8 protons, but differs in the number of neutrons. An isotope number is a shorthand representation of its mass. Because protons and neutrons are roughly equal in mass, an isotope's number is equal to the sum of its protons and neutrons.
Explanation:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
types of hardness water
Answer:
A water repellent protein that divides into hard and soft types
Which of the following is a challenge to democracy shared by both Brazil and Mexico?
A.
People have no economic freedoms.
B.
People accused of a crime have few protections.
C.
Most people do not have the right to vote.
D.
Crime and corruption are serious problems in government.
I’m givin brainliest out also gimme reason
identify the names of the reactants and products in the reaction.
CaCO3 -> CaO + CO2
Answer:
Name of the reactant --- Calcium CarbonateName of the product --- Calcium oxide and Carbon dioxideThe names of the reactant and products are:
1. The name of the reactant is calcium trioxocarbonate (iv) (CaCO₃)
2. The names of the products are:
a. Calcium oxide (CaO)
b. Carbon (iv) oxide (CO₂)
In a chemical equation, the reactants are located on the left hand side (LHS) while the products are located on the right hand side (RHS)
With the above information, we can determine which is the reactant and which is the product in the question given above. This can be obtained as follow:
CaCO₃ —> CaO + CO₂
Reactant => CaCO₃Products => CaO and CO₂The name of CaCO₃ is calcium trioxocarbonate (iv).
The name of CaO is calcium oxide.
The name of CO₂ is carbon (iv) oxide
Learn more: https://brainly.com/question/11764613
How can you turn mechanical energy into electrical energy
Answer:
In a turbine generator, a moving fluid—water, steam, combustion gases, or air—pushes a series of blades mounted on a rotor shaft. The force of the fluid on the blades spins/rotates the rotor shaft of a generator. The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy.
Explanation:
Hope this helps!
Brain-List?
What is the name of: CH3-CH(CH3)-CH2- alky group?
isopropyl
propyl
sec-butyl
butyl
Answer:
propyl
Explanation:
CH3-CH(CH3)-CH2 is a propyl group, the halogen is bromine thus the common name is propyl bromide
What is the molecular formula of the compound with a molecular weight of 112 g/mol and percent composition: 85.6% C and 14.4% H?
Select one:
a.C2H4
b.CH2
c.C4H8
d.C8H16
Explanation:
Mass of C = 112g * (85.6/100) = 95.87g
Moles of C = 95.87g / (12g/mol) = 8
Mass of H = 112g * (14.4/100) = 16.13g
Moles of C = 16.13g / (1g/mol) = 16
Hence the compound is C8H16. (D)
Hey!!!! Hru? 13(4)+8(78)=x
Answer:
x=676
Explanation:
Answer:
x = 676
Explanation:
13*4 = 52
8*78 = 624
624 + 52 = 676
For each claim below, select whether you think this claim is supported by evidence or not. Elisa is feeling tired because she has diabetes. Elisa is feeling tired because she has anemia. Elisa is feeling tired because she has an injury to her pancreas. Elisa is feeling tired because she has asthma.
Answer and Explanation:
Elisa is feeling tired because she has diabetes - suported: diabetes, in fact, can trigger episodes of extreme tiredness in patients, this tiredness may have been accompanied by dizziness and being.
Elisa is feeling tired because she has anemia. - Supported: Anemia hampers the transmission of oxygen in the blood, which can cause tiredness, weakness and extreme fatigue.
Elisa is feeling tired because she has an injury to her pancreas - suported: The pancreas is responsible for the production of insulin which is essential to prevent diabetes from establishing itself in the body. If the pancreas is damaged, insulin may be insufficiently produced, increasing the chance of developing diabetes and causing tiredness.
Elisa is feeling tired because she has asthma - suported: asthma causes breathing difficulties, this can cause tiredness and fatigue.
For the reaction 2H 2 +O 2 2H 2 O calculate the percent yield if 860. of water is produced when 100. g of hydrogen react with an excess of oxygen?
The percent yield : 95%
Further explanationGiven
Reaction
2H₂+O₂ ⇒2H₂O
Required
The percent yield
Solution
mol of Hydrogen(as a limiting reactant) :
[tex]\tt \dfrac{100}{2}=50[/tex]
mol H₂O based on H₂ , and from equation mol ratio H₂:H₂O=2 : 2, so mol H₂O = 50
Mass of water(theoretical yield) :
[tex]\tt mass=50\times 18=900~g[/tex]
[tex]\tt \%yield=\dfrac{860}{900}\times 100\%=95\%[/tex]
Which of the four elements is most likely to form cations in its reactions?
OA Nh
OB Ts
Oc Mc
OD. Og
Answer: It’s Nh !!!
Explanation:
Alkali metals and alkaline earth metals always produce cations, while halogens always produce anions. so, option A is correct.
What is cation ?A cation has a net positive charge because it contains more protons than electrons. One or more electrons must be lost in order for a cation to develop normally, these electrons are drawn away by atoms having a larger attraction for them.
Main-group elements often produce cations with a charge equal to the group number as they move from the extreme left to the right on the periodic table. To put it another way, group 1 elements produce 1+ ions, group 2 elements produce 2+ ions, and so on.
Cations, which have a positive charge, are created when electrons are lost. Anions, which have a negative charge, are created when electrons gain energy.
Thus, option A is correct.
To learn more about cation refer the link below;
https://brainly.com/question/1333307
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please help. thank you!
Find an interesting chemical reaction. It can be a simple one but please have some facts and info about it. Thank you!
Answer:
Elephant Toothpaste
When hydrogen peroxide and potassium iodide are mixed in proper proportions, the hydrogen peroxide decomposes very quickly.The soapy water traps the oxygen, a product of the reaction, and creates many bubbles. Foam is a kind of a mixture called a colloid - gas bubbles in a liquid.It produces foam but it also can produce heat.Extra
Make Elephant Toothpaste
Pour 1/2 cup hydrogen peroxide solution, 1/4 cup dishwashing soap, and a few drops of food coloring into the bottle. Swish the bottle around to mix the ingredients. Set the bottle in a sink or outdoors or some other place where you won't mind getting wet foam everywhere.
In a separate container, mix a packet of active yeast with a little warm water. Give the yeast about five minutes to activate before proceeding to the next step.
When you are ready to do the demo, pour the yeast mixture into the bottle. The reaction occurs immediately upon the addition of the yeast.
I don't know if this will help but here you go.
What is at the center of every atom?
an electron
a compound
a molecule
a nucleus
#2 - Which two particles make up the nucleus of an atom? *
protons and electrons
protons and neutrons
molecules and compounds
neutrons and electrons
#3 - What is the role of an electron in an atom? *
electrons live inside the nucleus and carry a neutral charge
electrons circle the nucleus and have a positive charge
electrons circle the nucleus and have a negative charge
electrons live inside the nucleus and have a negative charge
#4 - In an atom, what is the number of protons equal to? *
the number of electrons
the number of neutrons
the number of molecules
the number of nuclei
#5 - Which of the following determines the type of element that an atom makes? *
the size of the nucleus
the number of protons
how much the atom weighs
the number of neutrons
#7 - What is a compound? *
the center of an atom that is formed by neutrons, protons, and electrons
a tiny particle that makes up all matter
a molecule that is formed from two or more different types of atoms.
a molecule that is formed from the same type of atoms
The annswer are -
1. the center of an atom is a nucleus
2. protons and neutrons
3. electrons circle the nucleus and have a negative charge
4. the number of electrons
5. the number of protons
7. a molecule that is formed from two or more different types of atoms.
What is the explanation for these?1. The nucleus is at the center of every atom and contains protons and neutrons, while electrons orbit around the nucleus.
2. Protons and neutrons make up the nucleus of an atom, providing mass and stability.
3. Electrons circle the nucleus in specific energy levels and have a negative charge, playing a role in chemical bonding and interactions.
4. The number of protons in an atom is equal to its atomic number and determines the element it belongs to.
5. The number of protons in an atom specifically determines the type of element it represents.
7. A compound is a molecule formed from different types of atoms, combining chemically to create a new substance.
Learn more about atom at:
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12 gram of magnesium carbonate is heated till no for the loss of heat the final mass was found to be 5.28 gram how much CO2 gas was given out
Answer:
12 g
Explanation:
Chemical equation:
MgCO₃ → MgO + CO₂
12g = 5.28g + 6.72 g
12 g = 12 g
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
MgCO₃ → MgO + CO₂
There are 12 g of magnesium carbonate on the left side, according to the law of conservation of mass on the right side there should be 12 g product. Thus, 6.72 g of CO₂ should be formed.
Radiation is when heat is transferred through
A.
the
air
B. the object
O
C. the sun
D. the liquid
Answer:
I think its C
Explanation:
because it travels from the sun to earth
An airplane traveling 245 m/s east experienced turbulence, so the pilot decided to slow down to 230 m/s. It took the pilot 7 seconds to get down to this speed. What is the acceleration of the plane? (Round your answer to the nearest integer.)
–2 m/s2
2 m/s2
67 m/s2
–67 m/s2
The acceleration of the plane : -2 m/s²(negative=deceleration)
Further explanationGiven
vo=245 m/s
vt=230 m/s
t = 7 s
Required
The acceleration
Solution
Motion with constant acceleration
[tex]\tt v_t=v_o+at[/tex]
Input the value
[tex]\tt 230=245+a.7\\\\-15=7a\Rightarrow a=-2.14\approx rounded~-2~m/s^2[/tex]
Answer:
-2m/s²Explanation:
Edge 2020
what is the mass of 3.20x10^23 formula units of iron (III) oxide (Fe2O3)?
The mass of iron (III) oxide (Fe2O3) : 85.12 g
Further explanationGiven
3.20x10²³ formula units
Required
The mass
Solution
1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
mol of Fe₂O₃ :
[tex]\tt n=\dfrac{3.2.10^{23}}{6.02.10^{23}}=0.532[/tex]
mass of Fe₂O₃ (MW=160 g/mol)
[tex]\tt mass=mol\times MW=0.532\times 160=85.12~g[/tex]
We have 84.84g of Fe[tex]_2[/tex]O[tex]_3[/tex] in 3.20*10^23 particles.
Data;
number of particles = 3.20*10^23molar mass = 159.69g/molAvogadro's number = 6.023*10^23 particles.To solve this problem, we need to relate Avogadro number to the molar mass.
From molar mass - Avogadro's number relationship;
[tex]159.69g = 6.023*10^2^3\\xg = 3.20*10^2^3\\x = \frac{159.69*3.20*10^2^3}{6.023*10^2^3} \\x = 84.84g[/tex]
From the above calculations, 84.84g of Fe[tex]_2[/tex]O[tex]_3[/tex] is present in 3.20*10^23 particles of Fe[tex]_2[/tex]O[tex]_3[/tex].
Learn more on Avogadro's number here;
https://brainly.com/question/20091306
How do you find the precipitate in chemistry?
Answer: An ionic solution is when the ions of a compound have dissociated in an aqueous solution. A reaction happens when you mix two aqueous solutions. This is when you find out if a precipitate will form or not. A precipitate forms if the product of the reaction of the ions is insoluble in water.
Explanation: I think ;>;
Help ASAP give brainest if right And please hurry
Answer:
Conduction
Convention
Radiation
in that order
Answer:
Conduction
Convention
Radiation
Explanation:
What is the difference between electrical and light energy??
Answer:
Light energy is a form of electromagnetic radiation. Light consists of photons, which are produced when an object's atoms heat up. Light travels in waves and is the only form of energy visible to the human eye.
Electrical energy is a form of energy resulting from the flow of electric charge. Energy is the ability to do work or apply force to move an object. ... The movement of charged particles through a wire or other medium is called current or electricity.
will mark a brainliest.
Which of the following is correct chemical formula for "di-carbon tetra-oxide?"
C204
C404
C05
C2 08
Answer:
The answer is actually CO4
Explanation:
prove me wrong
Answer:
C2O4
Explanation:
Di means 2 and tetra means 4