Answer:
example of electromagnetic waves water waves and sound wave.
Types of mechanical waves are transverse and longitudinal wave...
which medium is denser between water and glass
What is the volume of a 0.25 M MgCl2 solution that contains 0.75 moles of MgCl2?
Answer:
The volume of the solution is 3 L.
Explanation:
Molarity is a measure of the concentration of that substance that indicates the number of moles per unit volume. In other words, molarity is the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.
[tex]Molarity=\frac{number of moles of solute}{solution}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}=M[/tex]
In this case:
Molarity= 0.25 Mnumber of moles of solute= 0.75 molesvolume= ?Replacing in the definition of molarity:
[tex]0.25 M=\frac{0.75 moles}{volume}[/tex]
volume*0.25 M= 0.75 moles
[tex]volume=\frac{0.75 moles}{0.25 M}[/tex]
volume= 3 L
The volume of the solution is 3 L.
If an animal has 64 chromosomes in their body cells, how many chromosomes would be in would be in a cell?
Answer:
i think its 32
Explanation:
What are the coefficients needed to balance this chemical reaction to show that matter is conserved?
In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. Which postulate of kinetic molecular theory best explains
how this is possible?
Attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly
O Collisions between gas particles are elastic, there is no net gain or loss of kinetic energy
Gases consist of a large number of small particles, with a lot of space between the particles
O Gas particles are in constant, random motion, and higher kinetic energy means faster movement
answer:Collisions between gas particlCollisions between gas particles or collisions with the vessel walls are perfectly elastic.
explanation:As long as an ideal gas is maintained at a constant temperature, the average kinetic energy of the molecules is said to be constant. In fact, what we call the temperature of a body at the macroscopic scale is just a representation of the kinetic energy carried by its atoms or molecules as they vibrate inside the body.
Now, if the kinetic energy of this oxygen gas is constant, it is because the collisions between the particles are assumed to be perfectly elastic. No energy is lost during the collisions. The rationale behind this assumption is that the particles are very tiny.
The answer which corresponds best to the explanation above is b. Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy.
Which sentence about an ocean current is correct
Upwelling is caused by the winds that on the oceans surface is the correct answer.
What are Ocean Current ?Ocean currents are water flow patterns that have an impact on climate zones and weather patterns all around the globe.
When winds blow they push the water from an area and to replace the displaced water water rises from beneath the surface and this process is called Upwelling.
Therefore Option C , Upwelling is caused by the winds that on the oceans surface is the correct answer.
To know more about Ocean Current :
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What is the mass of 4.7 moles of H2O
Answer:
ans.........❣️❣️❣️❣️❣️❣️❣️❣️❣️❣️❣️
Answer:
[tex]1 \: mole \: weighs \: 18 \: g \\ 4.7 \: moles \: weigh \: (4.7 \times 18) \: g \\ = 84.6 \: g[/tex]
A compound contains 46.67% Silicon and 53.33% oxygen. What is the
simplest formula for this compound?
Answer:
SiO2
Explanation:
A 800mL of gas sample at STP is compressed to a volume of 200 mL, and temperature increased to 30 °C, what will be the new pressure in kpa.
Answer:
449.7 kPa
Explanation:
We prepare the Ideal Gases Law to solve this question:
P . V = n . R . T
As moles of gas are the same, and R is constant, we can compare this two situations:
P₁ . V₁ / T₁ and P₂ . V₂ / T₂
As this remains constant we can propose:
P₁ . V₁ / T₁ = P₂ . V₂ / T₂
We convert T° to Absolute value: 30°C + 273 = 303 K
We convert the volume from mL to L
800 mL . 1L /1000 mL = 0.8 L
200 mL . 1L /1000 mL = 0.2 L
1 atm . 0.8 L / 273 K = P₂ . 0.2L / 303k
(0.8 L.atm / 273K ) . 303k = P₂ . 0.2L
0.8879 L.atm / 0.2L = 4.4 atm
We convert pressure from atm to kPa
4.4 atm . 101.3 kPa / 1 atm = 449.7 kPa
Answer:
450. kPa
Explanation:
Use the combined gas law. Solve for the unknown. Plug in the numbers, turn the crank, and out pops the answer. A typical plug-n-chug problem.
P1V1 / T1 = P2V2 / T2 …………….. combined gas law
P2 = P1V1T2 / (T1V2) ……………… solve for P2
P2 = 101.3 kPa x 800. mL x 303K / 273K / 200. mL
P2 = 450. kPa
We are assuming 3 significant digits, simply because it makes more sense than having only one significant digit. You didn’t actually specify a pressure unit, but I’m guessing you mean kilopascal, (kPa).
Question 11 of 25
Which functional group does the molecule below contain?
HIT
H-C-OH
H
A. Hydroxy
B. Ether
C. Amino
O D. Carbonyl
Carbonyl functional group contain molecule H-C-OH. Hence, option D is correct.
What is a functional group?A functional group is a group of atoms responsible for the reactions of a particular compound.
A carbonyl group contains a double bond linking a carbonyl carbon atom and a carbonyl oxygen atom. The carbonyl oxygen atom shares six valence electrons with the carbonyl carbon atom.
Hence, the carbonyl functional group contain the molecule H-C-OH.
Learn more about the functional group here:
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Answer:
A, hydroxyl
Explanation:
Just took the test on apex and the other answer was wrong and hydroxyl was correct
• Determine % H2O2 decomposed in first 500 s in a first order decomposition reaction of H2O2? k=7.30x10-4 s-1
Answer:
Given rate constant of the first-order reaction is:
K=7.30x10^-4 s-1
Time t=500s
Determine % H2O2 decomposed in first 500 s in a first-order decomposition reaction of H2O2?
Explanation:
The expression for the rate constant of the first-order reaction is:
[tex]k=\frac{2.303}{t} log \frac{ao}{a-x}[/tex]
where,
k=rate constant
t=time period
ao=initial amount of the reactant
a-x=amount of a remained after time t.
Substitute the given values in the above formula to get ao/a-x value.
[tex]7.30x10^-4 s^-1 = \frac{2.303}{500s} log \frac{ao}{a-x} \\log \frac{ao}{a-x} =7.30x10^-4 s^-1 * \frac{500s}{2.303} \\log \frac{ao}{a-x} =0.158\\\frac{ao}{a-x}=10^{0.158} \\\frac{ao}{a-x}=1.438[/tex]
% of H2O2 decomposed is:
[tex]\frac{ao}{a-x} = 1.438 *100\\ =143.8[/tex]
why is water so important for the ecosystem
Answer:
The main function of water is to enhance the plant growth provide a permanent for species that live within it, or provide a temporary home or breeding ground for multiple amphibians, insects and water-birthed organismsand to provide the nutrients and minerals necessary to sustain physical life.
Is ivy a monocot or dicot
Answer:
dicot
Explanation:
I looked it up lmoooo
Determine the empirical and molecular formula of a compound composed of 18.24 g Carbon, 0.51 g Hydrogen, and 16.91 g Fluorine has a molar mass 562.0 g/mol.
Answer: the answe
Explanation: 18 cabron - c hydr3gon is is 46.20
How many valence electrons does Chlorine need to GAIN to become stable?
Answer:
An atom of a group 17 element such as chlorine has seven valence electrons. It is “eager” to gain an extra electron to fill its outer energy level and gain stability. Group 16 elements with six valence electrons are almost as reactive for the same reason
Explanation:
What is the difference between chemical and physical change with respect
to behavior and fate of molecules?
Answer:
Physical changes are changes that do not alter the identity of a substance. Chemical changes are changes that occur when one substance is turned into another substance.
Explanation:
Read the selection from the section "Molecules In Motion." The molecules in the hot soup are traveling faster overall than they did before the soup was heated. Conversely, the molecules in an ice cube are moving more slowly. Why did the author use the word "conversely"?
Answer: The author used the word "conversely" because the first statement he made is in CONTRAST to the second statement he made.
Explanation:
Matter is made up of atoms or molecules that are in constant motion. The motion of these tiny particles ( molecules) gives the object energy. The movement of these molecules depends on the state of matter which includes
--> GASEOUS STATE: Here, the particles are completely free to move and are always in motion.
--> LIQUID STATE: particles in this state slide by one another and are always in motion.
--> SOLID STATE: particles in this state are held tightly together but are always in motion.
Also, the molecules in motion are greatly affected by temperature changes. Increase in temperature will cause the particles in the liquid to move faster. Such is seen when soup is heated, the molecules travel faster than before. But the OPPOSITE is seen in an ice cube. This is because the ice cube is in solid state and of a lower temperature.
How are the atoms of carbon alike and different?
if the ima of a machine is 4 and the effort force is 6.0 newtons, then the force exerted on the resistance by the machine is
Answer:
24 N
Explanation:
Mechanical advantage is the rate of load overcome to the effort applied to overcome the load or resistance. Also, it is the quotient of the resistance force to the effort force.
i.e MA = [tex]\frac{L}{E}[/tex]
Given that, MA = 4, and L = 6.0 N, then;
4 = [tex]\frac{L}{6}[/tex]
cross multiply to have
L = 4 x 6
= 24 N
L = 24 N
Thus, the force exerted on the resistance by the machine is 24 N.
Timed PLS help
Given the following reaction:
2 Al + 2 KOH + 4 H2SO4 + 22 H2O --> 3 H2 + 2KAl(SO4)2•12H2O
If you start with 8.3 mL of 9.9M sulfuric acid, what is the theoretical yield of alum?
Answer:
19.5g is the theoretical yield of alum
Explanation:
Based on the balanced reaction, 4 moles of sulfuric acid produce 2 moles of alum. To solve this question we need to find the moles of H2SO4. With these moles we can find the moles of alum and its mass assuming all sulfuric acid reacts producing alum.
Moles Sulfuric Acid:
8.3mL = 0.0083L * (9.9mol/L) = 0.08217 moles sulfuric acid
Moles Alum:
0.08217 moles sulfuric acid * (2mol KAl(SO4)2•12H2O / 4mol H2SO4) =
0.041085 moles KAl(SO4)2•12H2O
Mass Alum -Molar mass: 474.3884 g/mol-
0.041085 moles KAl(SO4)2•12H2O * (474.3884 g/mol) =
19.5g is the theoretical yield of alumwhat is the photoelectic effect
Answer:
When electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.
Explanation:
I'm assuming you mean the photoelectric effect.
(13)
QUESTION 5
5.1
Sulphur reacts with iron according to the equation:
Fe +S → FeS
The reaction requires large amount of heat
When 2,5g sulphur and 5 g iron were placed in a test tube and heated strongly, a
reaction took place to produce a greyish black solid. After the reaction was completed
the solid was found to be magnetic.
5.1.1 Why was this greyish black solid magnetic?
5.1.2 Calculate the mass of Fos produced
Answer:
The black solid is magnetic due to the special property of iron called ferromagnetism
6.9 g
Explanation:
The substance FeS is magnetic despite of the fact Fe^2+ is spin paired due to the special magnetic property of iron called ferromagnetism.
The equation of the reaction is;
Fe(s) + S(s) ----> FeS(s)
Number of moles of Fe = 5g/56g/mol = 0.089 moles
Since the reaction is 1:1, 0.089 moles of FeS is formed
For Sulphur;
Number of moles of sulphur = 2.5g/32 g/mol = 0.078 moles
Since the reaction is 1:1, 0.078 moles of FeS is formed
Hence sulphur is the limiting reactant.
So, mass of FeS produced = 0.078 × 87.91 g/mol = 6.9 g
help me (50 pointasss)
Answer:
The picture is most likely showing fishing/ fishery. other industries that rely on accurate weather forecast are shrimping, aquaculture, and other ocean industries
Explanation:
Answer:
Sailing Weather Routing
Explanation:
is a commercial service provided by commercial companies for cargo ships, to optimize their voyage performance. An adventure version of the same used for sailing boats is referred to as Sailing weather prediction or Sailing weather routing.
HELPPPPP PLEASE CHEMISTRY PLZZZ
Answer:
Carbon monoxide
explanation:
Identify all of the spectator ions in the reaction below.
Zn(OH)2(s) + 2H+(aq) + 2NO3(aq) → Zn2+(aq) + 2NO3- (aq) + 2H2O
a. Zn(OH)2
b. NO3-
c. Zn2+
d. H
e. H+ and NO3-
Match each renewable energy source with the correct description. solar cell converts sunlight into electricity geothermal energy turns turbines along coastlines wave water falling through dams turns turbines, generates electricity hydroelectricity o heat produced within the Earth
Answer:
Explanation:
solar cell - converts sunlight into electricity
geothermal energy - heat produced within the Earth
wave energy - turns turbines along coastlines
hydroelectricity - water falling through dams turns turbines, generates electricity
Answer:
Explanation:
The renewable energy sources are: solar cell, geothermal, wave and hydroelectricity. Their descriptions are as follows:
converts sunlight into electricity -> solar cell
energy turns turbines along coastlines -> wave
water falling through dams turns turbines, generates electricity -> hydroelectricity
heat produced within the Earth -> geothermal
Convert each of the following masses to the units requested
A. 500 liter to deciliters
B. 4200 km to hm
PLEASE HELP!
I’m on the last question!!
The correct model of c6h14
Explanation:
here u go hope this helps :)
After a 4.626g sample of silver oxide is heated, 4.306g of silver metal remains. What is the empirical formula of the compound?
please help me ;(
Answer:
The empirical formula is Ag2O.
The empirical formula is Ag2O.Explanation:
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.The ratio of atoms is the same as the ratio of moles. So our job is to calculate the molar ratio of Ag to 2O.
do the steps ...
To get this into an integer ratio, we divide both numbers by the smaller value.
From this point on, I like to summarize the calculations in a table.
ElementAgMass/gXMolesXllRatiomllIntegers
—————————————————−———mAgXXXm7.96Xm0.07377Xll2.00mmm2
mlOXXXXl0.59mm0.0369Xml1mmmml1
There are 2 mol of Ag for 1 mol of O.
Answer:
Hello There!!
Explanation:
The answer is↬The empirical formula is Ag2O. It is the simplest whole-number ratio of atoms in a compound.
hope this helps,have a great day!!
~Pinky~
