Answer: A man-made object that has been changed by weathering is the pyramids. The pyramids in Egypt have weathered slowly because of the dryness of the desert, but they have indeed weathered throughout the years.
Can someone explain a method to help convert different units of measurement to another? For example, centimeters to kiloliters? My teacher uses a chart method but it's a little confusing. Can anyone help?
Answer:
Compare your two units. The two units must measure the same thing.
For example, in the problem "convert 2 inches into centimeters," both inches and centimeters measure length. If your units measure two different things (like length and weight), you can't convert between them.
or
Look up the conversion. Before you can do the math, you need to know how much larger one unit is than the other.If the conversion you find has many decimal places, round to the nearest significant digit. If you don't know what a significant digit is, round to the second or third digit.
For example, if you need to convert 2 inches to centimeters, you need to know that 1 inch = 2.54 centimeters.
Explanation:
Hope this will help
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What is the charge of Aluminum?
O +3
0 -3
OO
O +1
Answer:
+ 3
Explanation:
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Given the density of 1.2 g/mL and a volume 7.8 mL. What is the mass? Round to the nearest 0.1.
Answer:
here is my answerrrrrrr
What is the difference between elements and compounds?
ASAP please and Thankyou
Explanation:
green is dominate and theres a G in each box that makes it all Green
water interacts with polar substances like –oh groups but not with non-polar substances like methyl (−ch3) or ethyl groups (−ch2). using this information, select the molecules that will easily dissolve in water based on polarity not on size. check all that apply.
CH3OH and CH3CH2CH2OH will easily dissolve in water based on polarity not on size.
What is Polarity ?In chemistry, polarity describes the type of bonds that exist between atoms. Atoms share electrons when they join forces to form chemical bonds. When one of the atoms applies a stronger attractive force to the bond's electrons, a polar molecule is created.
For instance, the chlorine atom is slightly negatively charged while the hydrogen atom in hydrogen chloride is slightly positively charged.Water is polar due to its form even though its molecules have no net charge. The molecule's hydrogen ends are positive, and its oxygen ends are negative. Water molecules are drawn to other polar molecules and to one another as a result.Learn more about Polarity here:
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_______: a type of nebula in which stars form
Answer:
Orion Nebula
Explanation:
That is an enormous cloud of gas and dust
Which type of orbital is shown?
Answer:
2px orbital...
Orbitals are represents the wave-like behavior of an electron or pair of electrons in an atom. Therefore it shows 2pX orbital.
What is orbitals ?
The four fundamental kinds of orbitals are s, p, d, and f. The spherical form of a s orbital can accommodate two electrons.
Each of the three p orbitals has the same fundamental structure but differs in its spatial orientation. Up to six electrons can fit into the p orbitals.
The s sublevel can only hold two electrons because it has one orbital. The p sublevel has three orbitals and a maximum capacity of six electrons.
The d sublevel may hold a maximum of 10 electrons due to its five orbitals. Additionally, the 4 sublevel has 7 orbitals and a maximum of 14 electrons.
Thus, it shows 2pX orbital.
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Help with number 4??????????? Asap
Answer:
it's A I think
Explanation:
hope u pass on this homework
Multi-Step Conversions (Always go through moles!)
Example: How many grams of water (H2O) will you need in order to have
3.22 x 1024 water molecules?
Mass of water needed : 96.3 g
Further explanationA mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 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
moles H₂O=
[tex]\tt moles=\dfrac{N}{No}\\\\moles=\dfrac{3.22\times 10^{24}}{6.02\times 10^{23}}\\\\moles=5.35[/tex]
mass H₂O(MW=18 g/mol) :
[tex]\tt mass=moles\times MW\\\\mass=5.35\times 18\\\\mass=96.3~g[/tex]
Why is the Law of Conservation of Mass a law, rather than a theory?
A. It has more scientific evidence supporting it
B. It has both independent and dependent variables
C. It has been tested with the latest laboratory balances, which are very accurate
D. It describes a repeatedly observed relationship, but it does not offer an exclamation
Answer: During a chemical reaction, matter cannot be created nor destroyed, matter can change form through physical and chemical changes, but through any of these changes, matter is conserved; even though the matter may change from one form to another, the same number of atoms exists before and after the change takes place.
Explanation: <3
Which stage of the cell cycle results in two identical cells?
mitosis
cytokinesis
interphase
metaphase
Answer:
B.
Explanation:
who will help it science
Answer:
yuh because it's the hot water :)
Which types of changes must follow the law of conservation of mass? (2 points)
O Both physical and chemical changes
O Neither physical nor chemical changes
O Only physical changes
O Only chemical change
What are some molecular compounds that we use in everyday life and their products?
Ex: Kirkland water - dihydrogen monoxide; H2O
Answer:
Water. Chemical Formula: H2O.
Table Salt. Chemical Formula: NaCl.
Sucrose (Sugar) Chemical Formula: C12H22O11.
Soaps. Chemical Formula: RCOO–Na, Where R is a long chain of carbon atoms ranging from 16-18 in number.
Toothpaste. Chemical Formula: CaCO3 or NaF.
Explanation:
A reaction is found to have an activation energy of 108 kj/mol. If the rate constant for this reaction is 4. 60 × 10-6 s-1 at 275 k, what is the rate constant at 366 k?.
The rate constant at 366K is 0.58 s⁻¹.
Ea = 108 kJ/mol = 108000 J/mol; an activation energy of a reaction
T₁ = 275 K
k₁ = 4.60 × 10⁻⁶ 1/s; the rate constant at 275 K
T₂ = 366 K
R = 8.314 J/Kmol
k₂ = ?; the rate constant at 366 K
Arrhenius equation: ln(k₁/k₂) = Ea/R (1/T₂ - 1/T₁)
ln(4.60 × 10⁻⁶s⁻¹/k₂) = 108000 J/mol/8.314 J/Kmol × (1/366K - 1/275K)
k₂ = 0.58 s⁻¹
For all chemical reaction some energy is required and that energy is called activation energy (energy that needs to be absorbed for a chemical reaction to start).
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HELP PLEASE :((( Explain why helium filled balloons deflate over time faster than air filled balloons do?
Answer:
Because helium has more molecules trying to escape at faster rates
Explanation:
Answer:
helium filled balloons tend to deflate over time faster than air filled balloons do because, the average velocity of helium molecules is higher than that of molecules of any gas found in air, so helium escapes through the pores in the balloon more quickly.
Explanation:
after researching I found this and tried to respond as quickly as possible!! hope this helps but it has something to do with the molecules .
Define "Petrifying Well".
Answer:
Explanation:
A petrifying well is a well which gives objects a stone-like appearance. If an object is placed into such a well and left there for a period of months or years, the object acquires a stony exterior.
The kinetic energy of an object can be determined using the equation , where is the kinetic energy, is the mass, and is the speed of the object. What is the mass of an object moving at a speed of 12 that has 36 J of kinetic energy?
Answer:
0.5kg
Explanation:
Given parameters:
Speed of the object = 12m/s
Kinetic energy = 36J
Unknown:
Mass of the object = ?
Solution:
Kinetic energy is the energy due to the motion of a body. It is mathematically expressed as;
K.E = [tex]\frac{1}{2}[/tex] m v²
Insert the parameters and solve;
36 = [tex]\frac{1}{2}[/tex] x m x 12²
36 = 72m
m = 0.5kg
how many electrons does cobalt lose/donate?
Answer:
Cobalt lose 3 electrons and donate 12 electrons.
Explanation:
In the periodic table,cobalt has nine electrons .It has lost 3 electrons,so it is only six left.Once it forms the complex,each ammonia donates a pair of electrons.
what is the purpose of making sodium extract for the detection of hetero elements in organic compond?
True or False: A polymer is a complex molecule made from smaller,
repeating molecules bonded together.
If two wave crests overlap each other and one has an amplitude of 5 and the other has an amplitude of 3, what is the interference that is created?
Answer:
The interference is 8
Explanation:
The formula of gypsum and that of plaster of parls are CaSO4.xH2O and CaSO4.yH2O respectively.
The difference x-y equals to;
1) 1
2) 3/2
3) 5/2
4) 1/2
Help me
Answer:
[tex]\frac{3}{2}[/tex]
Explanation:
Given formula of Gypsum:
CaSO₄. xH₂O,
True formula:
CaSO₄. 2H₂O, x = 2
Formula of plaster of paris = CaSO₄. [tex]\frac{1}{2}[/tex] H₂O,
y = [tex]\frac{1}{2}[/tex]
The difference between x and y; x - y:
x - y = 2 - [tex]\frac{1}{2}[/tex] = [tex]\frac{3}{2}[/tex]
What is magnetic fields?
2. Which of the following interactions would be the weakest?
A. Lit and C4H10
B. 02- and C3Hg
C. Lit and C3H8
D. 02- and C4H10
Answer:
its rather B or C
Im sorry if I was wrong
Explanation:
How many grarns would 3 moles of carbon dioxide (CO2) weigh? (round to the
nearest whole number)
Your answer
Mass of CO₂ = 132 g
Further explanationA mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 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
mole also can be formulated :
[tex]\tt n=\dfrac{mass}{MW}[/tex]
moles of CO₂ = 3
mass of CO₂(MW=44.01 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=3\times 44.01\\\\mass=132.03~g\approx 132~g[/tex]
1)Calculate the molar masses for the following compounds.
a)NH4NO3
b) N2O5
c) NaCN
d)(NH4)2SO4
2.a)What is the volume of 0.001 mol of hydrogen (H2) gas at STP?
b)What is the mass of 5.6 L of CO2 gas at STP?
3)a. What is the total number of atoms found in 3 moles of a N2 molecule?
b.Calculate the number of helium (He) atoms if 0.05 moles of He is given.
4.a)What is the mass of 3 moles of NaOH? b)What is the mole number of 22 g of CO2 gas?
5.a)What is the number of moles of 224 L Chlorine (Cl2) gas at STP?
b) Find the masses for the following substances in grams- 1)1.5 mol of water 2)20 mol of C₂2H6 6. If 10 moles of oxygen (O2) molecules are given, calculate the volume of the oxygen molecules at STP.
7. What is the mass of 3 moles of NaOH?
NH4NO3 The molar mass is 80.04336 g/mol
N2O5 The molar mass is 108.01.
NaCN The molar mass is 49.00717 g/mol
(NH4)2SO4 The molar mass is 132.139 g/mol .
Molar masses
The mass in grams of one mole of a chemical is its molar mass.
1) What is the mass of 5.6 L of CO2 gas at STP?
PV = nRT is the ideal gas equation, which links pressure (P), volume (V), and absolute temperature (T).
where R = 8.314 Jmol K-1, the universal gas constant.
1 mole = 1 mole = 1 mole = 1 mole = 1 mole = 1 mole = 1 mole = 1 mole = 1 mole = 1 mole = 1 mole = 1 atm = 1.1310 5 Nm 2
V=nRT/P =1.8.14.273/(1.013.10 5) =0.0224 m 3
2.24 liters
As a result, a gas's molar volume at STP is 22.4 litres.
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Use the portion of the periodic table shown at the bottom to answer the questions.
Part 1: Name two elements that have the same properties as magnesium (Mg).
Part 2: Determine the number of protons, electrons, and neutrons present in an atom of potassium (K). Explain how you determined your answer using complete sentences.
Answer:
Part 1 calcium and strontium have same properties as magnesium because all three are in same group.
Part 2 As atomic number of potassium is 19 so it contains 19 protons and 19 electrons because it is neutral
Potassium has 20 neutrons because its mass is 39
We can find neutron = atomic mass - atomic number
Explanation:
why is our use of electric power increasing?