Answer:
There are 4.59*10^-24 atoms in 15.00 of pure gold.
Explanation:
Molar mass of gold is 196.996g/mol
[tex]\frac{15}{196.966} =0.076 mol[/tex]
0.076*(6.022*10^-23)=4.59*10^-24
What is polyethylene?
A.Thermoplastic polymer
B.Electroplastic polymer
C.Thermoplastic monomer
D.Single monomer
Explanation:
thermoplastic polymer
I want the C answer plss help meee
Answer:
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Due to the fact that electrons are delocalized in graphite, it is a good conductor of electricity. Carbon atoms in graphite form hexagonal layers and are in covalent bonds with three other carbon atoms. Due to this non-bond electron configuration, each carbon atom conducts electricity in the form of a delocalized electron.
Please help me out I have 20 mins, show work !
Answer:
8)Dinitrogen tetraoxide
9)+5
10)NH4HSO4
Explanation:
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A cylinder was found in a storeroom of a manufacturing plant. The label on the cylinder was gone, and
no one remembered what the cylinder held. A 0.00500-gram sample was found to occupy 4.13 mL at 23°C
and 745 torr. The sample was also found to be composed of only carbon and hydrogen. Identify the gas
The gas that is to be identified in the problem is C2H2
From the ideal gas equation;
PV = nRT
P = pressure of the gas = 745 torr or 0.98 atm
V = volume of the gas = 4.13 mL or 0.00413 L
n = number of moles of the gas = ?
R = gas constant = 0.082 atm Lmol-1K-1
T = temperature of the gas = 23°C + 273 = 296 K
n = PV/RT
n = 0.98 atm × 0.00413 L/0.082 atm Lmol-1K-1 × 296 K
n = 0.00405/24.272
n = 0.000167 moles
Recall that;
Number of moles = mass/molar mass
molar mass = mass/Number of moles
molar mass = 0.00500-gram/0.000167 moles
molar mass = 30 g/mol
Since it is a hydrocarbon;
[12 +1]n = 30
n = 30/13
n = 2
The gas is C2H2
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What state does a gas turn into if it reaches it freezing point?
O Solid
O Liquid
Gas
O None of the above
Answer:
Solid
Explanation:
According to Wikipedia
Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Deposition is a thermodynamic process. The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.
Himalayan pink salt has a density of 1.03 g/mL.
Calculate the volume, in liters (L), per kg of that salt.
The volume, in liters, per kg of the Himalayan pink salt would be 0.97 L
Recall that: density = mass/volume
Hence: volume = mass/density
In this case, the density of the Himalayan pink salt is 1.03 while the mass we are working with is 1 kg.
1 kg is equivalent to 1000 g
Thus: volume = 1000/1.03
= 970.87 mL
Divide by 1000 to convert to L
970.87/1000 = 0.97 L
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Who is the intended audience?
Answer:
From Middle school to college
1) Is a moth bursting out of cocoon a chemical or physical change? (I put chemistry because i didn't know what else to put) 2) Is playing with purple and green slime chemical or physical change
Answer:
1)A moth bursting out of a cocoon is neither a chemical or physical change, it's a biological change. If I had to chose it would be a physical change though. Not to sure...
2)Playing with slime is a physical change.
Explanation:
1)The reason why I would chose physical change is because the moth is changing it's physical state more than it's chemical composition, but you should say both if that's an option.
2)A physical change is when the temperature, shape, or state of matter changes. A chemical change occurs when the actual substance changes. An example of this is a chemical reaction. Because the slime is changing shape and not substances, I would say that it's obviously a physical change.
Hope this helps, sorry that I'm not too sure about the 1st question.
What is the mass grams that are in 1 molecule of H2?
Beautiful vases, figurines, and plate are some of the households which are useful. These objects are produced from a special kind of mixture. What kind of mixture do they possess?
Solution
Suspension
Colloid
Particles
Beautiful vases, figurines, and plate are a kind of mixture called colloid.
A colloid comprises of the dispersion of one substance in another. Therefore in a colloid there must be;
The dispersed substanceThe dispersing mediumThese beautiful vases, figurines, and plate are made of ceramics. In ceramics, composite materials and fibers are dispersed in a polymer matrix. Hence these beautiful vases, figurines, and plate are made of colloids.
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write insoluble or soluble solution for the following mixtores
1
2
3
4
5
Gasoline in water = insoluble
acetone in nail polished = soluble
salt in alcohol = soluble
oil in vinegar = insoluble
tawas in water = soluble...
Sorry if i am incorrect......
What is the molarity of a solution that contains 114.4g NaCl (molar mass= 58.44 g/mol) in 1.2 L solution?
Answer:
1.6 M.
Explanation:
We want to find the molarity of a solution that contains 114.4 g NaCl in a 1.2 L solution.
Recall that molarity is given by:
[tex]\displaystyle \text{M} = \frac{\text{ mols solute}}{\text{ L soln.}}[/tex]
Convert 114.4 g NaCl to mol NaCl using its molecular weight:
[tex]\displaystyle 114.4 \text{ g NaCl} \cdot \frac{1 \text{ mol NaCl}}{58.44 \text{ g NaCl}} = 1.958\text{ mol NaCl}[/tex]
Therefore, the molarity of the solution will be:
[tex]\displaystyle \text{M} = \frac{1.958 \text{ mol NaCl}}{1.2\text{ L soln.}} = 1.6 \text{ M}[/tex]
In conclusion, the molarity of the solution is 1.6 M.
Answer question based on the periodic table entry for gallium.
How many neutrons does gallium have?
a. 70
b. 39
c. 69
d. 31
Answer:
b. 39 Neutrons would be correct.
Cho a g hhA (Na và Ca) vào y g H2O thì thu đc 6,72l khí (đktc) và ddB trg đó nồng độ M kiềm canxi. Tính x,y bt C% của Na là 8%
Answer:
t5gbt 4 tbg3rvb tjj5tb4b4bv
Explanation:fhtb v4bvtvhbvv bh
How many mass would be contained in 0.01mol of NaOH
Answer:
Explanation:
1mol NaOH---->40
0.01mol NaOH------>x
X=40×0.01=0.4
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Answer:
what the model is describing is the molecules. when molecules are tightly packed they form a solid like ice, and when the ice is melting forms a liquid because the molecules are spreading out. when the ice evaporates (gas) the molecules are moving about and are not touching eachother
why copper and chromium having Anamalous electronic configuration?
Answer:There are two main exceptions to electron configuration: chromium and copper. See below
Explanation:
These two elements are exceptions because it is easier for them to remove a 4s electron and bring it to the 3d subshell, which will give them a half filled or completely filled subshell, creating more stability.
when you leave orange juice in the fridge for a while, the pope begins to sync to the bottom of the container. Why does this happen?
Orange Juice is a heterogeneous mixture. This means the orange juice contains more than one component.
This is true because orange juice contains two components. They are:
The juiceThe pulpThe reason why the pulp in orange juice sinks to the bottom is because the pulp is denser than the juice. So it is heavier and sinks to the bottom.
Density is how dense or heavy a substance is. Orange juice is a mixture of pulp and juice. When you leave orange juice in the fridge for a while, the pulp begins to sync and settle at the bottom and this is because the pulp is heavier or denser than the orange juice. So the heavier component which is the pulp sinks to the bottom.To learn more, visit the link:
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How many different types of elements make up one molecule of potassium perbromate, KBrO4?
Answer:
3.
Explanation:
potassium
bromine
oxygen
Calculate the molarity of each of the following solutions.
1.30 mol of KNO3 in 250.0 mL of solution
0.500 mol of BaCl2 in 100.0 mL of solution
0.195 mol of Na2CO3 in 200.0 mL of solution
7.00 mol of C6H12O6 in 250.0 mL of solution
Answer:
5.2M, 5M, 0.975M, 28M
Explanation:
M = ( moles × 1000 ) ÷ volume
Molarity is affected by temperature. Its unit is mole/litre. It measure the concentration of any solute in a solution. Thus the molarity of [tex]KNO_{3}[/tex],[tex]BaCl_{2}[/tex],[tex]Na_{2}CO_{3}[/tex] and[tex]C_{6}H_{12}O_{6}[/tex] are 5.2mol/litre, 5mol/litre, 0.97mol/litre, 28mol/litre respectively.
What is molarity?
Molarity can be calculated by dividing number of moles of solute by volume of solution in liter.
Other concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution
Mathematically,
Molarity= number of moles of solute/volume of solution in litre (1)
1) Molarity of [tex]KNO_{3}[/tex]= {1.30 mol ×(1000ml/l)}÷250.0 mL=5.2mol/litre
2)Molarity of [tex]BaCl_{2}[/tex]= {0.500 mol ×(1000ml/l)}÷100.0 mL=5mol/litre
3)Molarity of[tex]Na_{2}CO_{3}[/tex]= {0.195 mol ×(1000ml/l)}÷200.0 mL=0.97mol/litre
4)Molarity of [tex]C_{6}H_{12}O_{6}[/tex] = {7.00 mol ×(1000ml/l)}÷ 250.0 mL=28mol/litre
Thus the molarity of [tex]KNO_{3}[/tex],[tex]BaCl_{2}[/tex],[tex]Na_{2}CO_{3}[/tex] and[tex]C_{6}H_{12}O_{6}[/tex] are 5.2mol/liter, 5mol/litre, 0.97mol/litre, 28mol/litre respectively.
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when a candle burns both physical and chemical changes take place at identify these changes give another example of a familiar process in which both the chemical and physical changes takes place.
Answer:
So, the melting of wax and vapourisation of melted wax are physical changes. Chemical Changes : The wax near flame burns and gives new substances like carbon dioxide, carbon soot, water vapour, heat and light. LPG is another example of a familiar process in which both the chemical and physical changes take place.
distingush between conduction, convection, and radiation.
Answer:
Conduction is between solids, convention is between liquid and radiation between the sun and a body on the earth
Answer:
In conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, heat transfer occurs through electromagnetic waves without involving particles. ... The heat transfer occurs through a heated solid object.
Explanation:
Explain the difference between accuracy and precision.
Answer:
Accuracy is the degree of closeness to true value.
Precision is the degree to which an instrument or process will repeat the same value.
Hope it helps....
Answer:
Accuracy and precision are alike only in the fact that they both refer to the quality of measurement, but they are very different indicators of measurement. Accuracy is the degree of closeness to true value. Precision is the degree to which an instrument or process will repeat the same value
How are physical changes related to state of matter changes?
Answer:
Changes of state are physical changes. They occur when matter absorbs or loses energy. Processes in which matter changes between liquid and solid states are freezing and melting. Processes in which matter changes between liquid and gaseous states are vaporization, evaporation, and condensation.
hope this helped
what's is the most stable oxidation state for chromium and iron
Chromium exhibits a wide range of possible oxidation states, where the +3 state is the most stable energetically. The +3 and +6 states are the most commonly observed in chromium compounds, whereas the +1, +4 and +5 states are rare.
18.Which shows chemical weathering?
A. Rocks are dissolved by acid.
B. Rocks are irregularly shaped.
C. Rocks are broken into pieces.
D. Rocks are changed into finer particles.
19. How long does it take for the moon to rotate on its axis?
A. 12 days
B. 20 days
C. 15 days
D. 28 days
20.Why is the moon important to human beings?
A. It help farmer know the right time to plant crops.
B. It makes planet earth beautiful.
C. It makes the earth climates bearable.
D. It makes earth a more livable planet and stay in its axis.
22.Which statement is NOT true?
A. Stars differ in size.
B. Red stars are the hottest star.
C. The sun is a medium sized yellow star.
D. Supernovas are exploding stars.
24.What is the effect of the northeast monsoon in the country?
A. Brings rainfall.
B. Cold weather and little rainfall.
C. No rainfall and cold weather.
D. Little rainfall and warm weather.
Explanation:
18 A
19 C
20 C
22 A
24 B
hope this helps you.
What is the energy of a photon with a wavelength of 260nm?
Answer:
4.76
Explanation:
What is made when certain wavelengths of light, or colors, are given off by hot gases and can be thought of like a fingerprint for elements?
constellations
nebulae
supernovas
emission lines
The emission lines of an element is characteristics of the element and can be thought of like a fingerprint for elements. Emission spectra is used to identify the elements.
What is emission spectrum ?The electromagnetic radiation spectrum produced when an electron changes from a high energy state to a lower energy state is known as the emission spectrum of a chemical element or chemical compound.
The energy difference between the two states is equal to the photon energy of the emitted photon. Each atom contains a large number of potential electron transitions, and each transition has a distinct energy difference.
An emission spectrum is made up of a variety of transitions that result in various radiated wavelengths. The emission spectra of each element is distinct. Therefore, option d is correct.
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The amount of K O H needed, in grams, in reaction 1 if you want to have 10% excess K O H
The mass of KOH reacted is 2.576 g. To have a 10% excess KOH, i need 2.833 g of KOH.
The equation of the reaction is;
2 Al(s) + 2 KOH(aq) + 6H20 (l) --------> 2K+ (aq) + 2 Al(OH)4^- (aq) + 3H2(g)
We are told that 1.25 g of Al was used in the reaction, hence;
Number of moles of Al = 1.25 g/27 g/mol = 0.046 moles
To obtain the amount of KOH required for the reaction;
2 moles of Al reacts with 2 moles of KOH
0.046 moles of Al also reacts with 0.046 moles of KOH
Mass of KOH reacted = 0.046 moles of KOH × 56 g/mol = 2.576 g
To have a 10% excess KOH;
Let the needed mass of KOH be x
x =2.576 g + (0.1 × 2.576 g)
x = 2.833 g
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Assuming you start with 1.25 g of pure aluminum, calculate the following:
1) The amount of potassium hydroxide, KOH, in grams, needed to react with all of the 1.25 g of Al. The reaction is: 2 Al(s) + 2 KOH(aq) + 6H20 (1) ---> 2K+ (aq) + 2 Al(OH)4^- (aq) + 3H2(g) 2) The amount of KOH needed, in grams, in reaction 1 if you want to have 10% excess KOH.A video camera would be most beneficial to someone who investigates?
Answer:
a person or persons murder
Answer: the aerodynamics of hummingbird wings.
Explanation: i got it right