Answer:
the one that uses radio communication is FM Radio
Which statement is supported by the information in the image?
Many volcanoes are on the eastern coast of Asia.
Most volcanoes are in the center of continents.
No volcanoes are found in the middle of the ocean.
Many volcanoes are on the eastern coasts of North and South America.
Answer:
Option A
Explanation:
Answer:
A. Many volcanoes are on the eastern coast of Asia.
Explanation:
Got it right on my quiz bye lol
can anyone answer these?
Answer:
18 is a
19 is c
20 i am not sure
Explanation:
18)nucleus contains protons and neutrons
What is the density of water in g/mL? What does that mean?
Answer:
Its 1 g/ml
Explanation:
How many liters of cane juice is needed to supply 5g sucrose if cane juice contains 12% sucrose
by mass and has a density of 1.12 g/mL?
Given parameters:
Mass of sucrose = 5g
Density of sucrose = 1.12g/mL
Percentage of sucrose per liter of cane juice = 12%
Unknown:
Volume of cane juice needed = ?
We need to establish the volume - density relationship. Density is the mass of a substance per unit volume.
Mathematically;
Density = [tex]\frac{mass}{volume}[/tex]
Now solve for the volume of sucrose;
1.12g/mL = [tex]\frac{5}{Volume}[/tex]
Volume = [tex]\frac{5}{1.12}[/tex] = 4.46mL = 4.46 x 10⁻³L since 1000mL = 1L
Since 12% of 1 liter of cane juice is sucrose;
12% of x liter of cane juice = 4.46 x 10⁻³L
Volume of cane juice = 4.46 x 10⁻³ x [tex]\frac{100}{12}[/tex] = 0.037L
Volume of cane juice is 0.037L
A vessel of 120ml capacity contains a certain amount of gas at 35°C and 1.2 bar pressure. The gas is transferred to another vessel of volume 180ml at 35°C. What would be its pressure
Given parameters:
Initial volume = 120ml
Initial temperature = 35°C
Initial pressure = 1.2bar
Final volume = 180ml
Final temperature = 35°C
Unknown:
Final pressure = ?
To solve this problem, we apply the combined gas law. The expression is given below;
[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
Where P₁ is the initial pressure
P₂ is the final pressure
V₁ is the initial volume
V₂ is the final volume
T₁ is the initial temperature
T₂ is the final temperature
We need to convert the parameters to standard units
take the volume to dm³;
1000ml = 1dm³
120ml = [tex]\frac{120}{1000}[/tex] dm³ = 0.12dm³ = initial volume
Final volume;
1000ml = 1dm³
180ml = [tex]\frac{180}{1000}[/tex] dm³ = 0.18dm³
Now, the temperature;
K = 273 + °C
Initial temperature = 273 + 35 = 308k
Final temperature = 308k
We then input the parameters into the equation;
[tex]\frac{1.2bar x 0.12 }{308} = \frac{P_{2} x 0.18 }{308}[/tex]
Solving for P₂;
P₂ = 0.8bar
The new pressure or final pressure in the vessel is 0.8bar
Before a new medicine is approved, scientists study the effects the medicine has on different parts of the body. Often, a medicine is tested on mice before it is tested on humans. All the cells in the illustration below came from the same mouse.
Four images of unique looking cells
If all of these cells are mouse cells, why do they look so different from each other?
A. Cells change shape as they get older.
B. Different cells specialize in different functions.
C. Each kind of cell is from a different organ system.
D. Different-shaped cells came from different ancestors.
Answer:
different cell specialized in different function
Different cells specialize in different functions but they look so different from each other.
What is a cell?The basic and structural component of life is the cell. Cell biology is the study of cells, including their fundamental makeup and each organelle's functions. Cells were initially found by a biologist, Robert Hooke.
Cells comprise all living things. They could consist of several cells or just one (unicellular) (multicellular). The tiniest known cells are mycoplasmas. The foundation of all living things is cells. They give the body structure and transform the food's nutrients into energy.
Complex cells have many parts that each serve a different purpose within an organism. Similar to constructing bricks, they come in a variety of sizes and shapes. Our body is made up of various types of cells.
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HELP NOW!!!!!! When you put water into a hot metal pan of equal mass, why does the pan cool down more than the water heats up?
Answer:
Because the specific heat of the metal is less than the specific heat of water.
Explanation:
Hello, happy to help you today!
In this case, we need to analyze a property called "specific heat" which accounts for how much energy is required to increase or decrease the temperature of 1 g of the substance by 1 °C.
In this case, since the specific heat of water is about 4.184 J/g°C and the specific heat of metals in general is greater than zero, of course, but less than one, we can infer that for the same amount of energy, when they are in contact, more grams of metal will be cooled down to those of water heated up, because the specific heat of the metal is less than the specific heat of water.
Best regards!.
How many valence electrons does a neutral atom with 15 protons have?
Answer:
5 valence electrons
Explanation:
4) A metal cylinder is placed in a graduated cylinder which has been filled with
water to the 80.0 mL mark. The water level rises to the 88.0 mL mark.
(a) What is the volume of the metal cylinder?
3
(b) The cylinder has a density of 3.21 g/cm^3. What is its mass?
Explanation:
(a).volume = final volume of water - initial volume of water
Volume of metal cylinder = 88 - 80
We have the answer as
8.0 mL(b).The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 8 mL
density = 3.21 g/mL
So we have
mass = 3.21 × 8
We have the answer as
25.68 gHope this helps you
Which of the following should be measured with a meter stick, not a tape measure?
A.
the length of ribbon needed to tie around a vase
B.
the size of a student's waist
C.
the distance from the ground to the top of a ramp
D.
the circumference of an orange
Answer:
C
the distance from the ground to the top of a ramp
MnS+HCl H 2 S+MnCl 2 Which set of coefficients would balance the equation?
Answer:
1,2,1,1
Explanation:
What is the net ionic equation of SnSO4+K2S=SnS+K2SO4?
Answer:
Sr{2+}(aq) + S{2-}(aq) → SrS(s)
How many CO2 molecules in 0.0189 mol of CO2?
.11 x 1022 molecules
.624 x 1023 molecules
1.14 x 1022 molecules
Answer:
Explanation:
44.0095 grams.
Balancing Redox Reactions
VO2++MnO4 V(OH)4++Mn2+(acidic)
Answer:
MnO4- + 5 VO +2 + 11 H2O = 5 V(OH)4+ + Mn+2 + 2 H+
Explanation:
The balanced redox reaction is MnO⁴⁻ + 5 VO⁺² + 11 H₂O = 5 V(OH)⁴⁺ + Mn+2 + 2 H⁺.
What are redox reactions?Redox reactions are those reactions in which there is the transfer of electrons between different elements. These reactions are of two types, oxidation and reduction reactions. Examples are combustion, displacements, corrosion, and rusting reactions.
An example of a chemical reaction in which one or more electrons are lost is an oxidation reaction.
A reduction reaction is one in which one or more electrons are acquired during a certain kind of chemical reaction.
The formation of hydrogen fluoride is a redox reaction.
H₂ + F₂ = 2HF
H₂ = 2H + 2e⁻
F₂ + e⁻ = 2F⁻
Thus, the reaction is MnO⁴⁻ + 5 VO⁺² + 11 H₂O = 5 V(OH)⁴⁺ + Mn+2 + 2 H⁺.
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Please help i really need to turn it in like right now.
There is no function/description that accurately matches up with the vacuole. In fact, there are 13 organelles provided and only 12 functions/descriptions listed; presumably, the description/function of the vacuole is the one that is missing.
The atomic mass number is gotten
adding the number of electrons
and number of Protons
True
or false.
Answer:
False
Explanation:
the sum of protons and neutrons gives us the mass number
Question 10 (1 point)
Match the prefixes to their long form.
Column A
Column B
1.
1 kilometer (km)
1000 meters
millimeter (mm)
b. meters
. 3.
centimeters (cm)
c. 0.001 meters
4.
base unit
d. 0.01 meters
Answer:
A,C,D,B
Explanation:
1killometer=1000m
1mm=0.001m
1cm=0.01m
base unit of length is meter
Answer:1 kilometer 1,000 meters
1 centimeter 10 millimeters
1 meter 100 centimeters
Explanation:
What properties does nonmetals have
Answer:
1. high ionization energies
2. high electro negativities
3. poor thermal conductor
4. poor electrical conductor
5. gain electrons easily
How many grams of C12 can be prepared from the reaction of 16.0 g of MnO2 and 30.0 g of HCl according to the following chemical equation? Mn02 + 4HCI → MnCl2 + Cl2 + 2H2O
Answer:
Mass of Cl₂ produced 12.78 g
Explanation:
Given data:
Mass of MnO₂ = 16 g
Mass of HCl = 30.0 g
Mass of Cl₂ produced = ?
Solution:
Chemical equation:
MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O
Number of moles of MnO₂:
Number of moles = mass / molar mass
Number of moles = 16 g/ 87 g/mol
Number of moles = 0.18 mol
Number of moles of HCl:
Number of moles = mass / molar mass
Number of moles = 30 g/ 36.46 g/mol
Number of moles = 0.82 mol
Now we will compare the moles of Cl₂ with MnO₂ and HCl.
MnO₂ : Cl₂
1 : 1
0.18 : 0.18
HCl : Cl₂
4 : 1
0.82 : 1/4×0.82 = 0.205 mol
The number of moles of Cl₂ formed by HCl are less it will limiting reactant.
Mass of Cl₂ formed:
Mass = number of moles × molar mass
Mass = 0.18 mol × 71 g/mol
Mass = 12.78 g
i need help with this question
Answer:
i do not know the answer but pls give a heart and five starts so i can ask questions pls
Explanation:
Balancing Equations and type of reaction quiz
Question 5
10 points!
Energy transformations take place when batteries power a
flashlight
Which flowchart best represents how these transformations take place?
-
O A. Chemical (batteries) - electrical (electrical circuits)
electromagnetic (bulb)
O B. Electrical (batteries) - chemical (electrical circuits) -
electromagnetic (bulb)
electrical
C. Chemical (batteries) -- thermal (electrical circuits)
(bulb)
O D. Electrical (batteries) -- chemical (electrical circuits) - electrical
(bulb)
Answer: B. Electrical (batteries) - chemical (electrical circuits) -
Explanation: I'm really sorry if I am wrong. Cause it might be A. Chemical (batteries) - electrical (electrical circuits)electromagnetic (bulb)
-Hope this some what helps. :)
Answer:
A. Chemical (batteries) - electrical (electrical circuits)
electromagnetic (bulb)
Convert 29.85 degree Celsius to Kelvin
Answer:
its 303 Kelvin. (typing this for characters)
How much energy (in kcal) is involved when 5.2 g of water at 0.0oC is converted to ice? Enter only the numeric value for your answer (no units).
Answer:
[tex]Q=0.41kcal[/tex]
Explanation:
Hello.
In this case, since the energy involved during this process is associated to the freezing enthalpy of water at the freezing point of water (0.0 °C) and is computed via:
[tex]Q=m\Delta _{freezing}H[/tex]
It is known that the freezing enthalpy of water is -333.3 J/g, therefore, the involved heat is:
[tex]Q=5.2g*-333.33\frac{J}{g}\\ \\Q=-1733.33J[/tex]
Clearly, it is negative since freezing requires the removal of energy, which means it is negative based on the first law of thermodynamics. Finally, the energy in kcal turns out:
[tex]Q=1733.33J*\frac{1kcal}{4184kJ}\\ \\Q=0.41kcal[/tex]
Regards.
This figure (Figure 1)shows a container that is sealed at the top
by a movable piston. Inside the container is an ideal gas at 1.00
atm, 20.0°C, and 1.00 L. What will the pressure inside the container become if the piston is moved to the 1.60L mark while the temperature of the gas is kept constant
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's gas law is used here. Therefore the new pressure inside the container will be 0.833 atm.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of ideal gas
V= volume of ideal gas
n =number of moles of ideal gas
T =temperature of ideal gas
R = Gas constant = 0.0821 L.atm/K.mol
According to Boyle's gas law
P₁V₁ = P₂V₂
Substituting all the given values in the above equation, we get
(1 atm) (1 L) =(P2) ( 1.60L )
P2 = 0.833 atm
Therefore the new pressure inside the container will be 0.833 atm.
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What is the function of a cell wall
(A) to protect and support the cell
(B) to perform different functions in each cell
(C) to prevent water from passing through the cell
(D) to prevent oxygen from entering the cell
Answer:
the answer is A to protect and support the cell
Answer:
A)
Explanation:
Human impact on the environment is often more dramatic than the impact of most other living things because humans have a greater
A. Need for water
B. Need for food
C. Need for air
D. Ability to filter water
E. Ability to adapt to change
F. Ability to alter the environment
Human impact on the environment is often more dramatic than the impact
of most other living things because humans have a greater ability to alter
the environment.
Human beings are usually in control of most of the resources on earth such
as plants, animals, etc. Humans have developed new technologies for doing
things which have an impact on the environment.
Deforestation, burning of fossil fuel in automobiles and industries emits toxic
gases which have been found to alter the environment more than other
living things.
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5.712 grams = kilograms
Answer:
0.005712
Explanation:
5.712 grams = 0.005712 kilograms
Answer:
It would be 0.005712
Explanation:
A group of students is investigating how a force applied to an object affects the motion of that object. The diagram shows the setup for the investigation. To create a force, the students add a weight to the weight holder and observe whether the cart moves. The students repeat this step five times, using a different amount of weight each time. Identify the independent and dependent variables of this investigation.
Answer:
87 is the wight of the hight
Explanation:
A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is a stainless-steel cylinder that measures 21.0cm wide and 25.2cm high. The maximum safe pressure inside the vessel has been measured to be 4.00MPa. For a certain reaction the vessel may contain up to 0.474kg of boron trifluoride gas. Calculate the maximum safe operating temperature the engineer should recommend for this reaction. Write your answer in degrees Celsius. Be sure your answer has the correct number of significant digits.
Answer:
Explanation:
Volume of cylinder = πr²h where r is radius of cylinder, h is height of cylinder
r = d/2 = 21/2 = 10.5 cm; h = 25.2 cm
volume of cylinder = (22 * 10.5 cm * 10.5 cm * 25.2 cm) / 7
volume = 8731.8 cm³ = 8.7318 L
Using the ideal gas equation, PV = nRT
P = 4.00 MPa = 4.0 * 10³ kPa, V = 8.7318 L, R = 8.314 L.kPa/mol.K,
n = mass / molar mass
where mass = 0.474 kg or 474 g, molar mass of BF₃= 68 g/mol
n = 474 g / 68 g/mol = 6.9706 moles
making T subject of formula in the ideal gas equation;
T = PV/nR
T = (4.0 * 10³ kPa * 8.7318 L)/(6.9706 mol * 8.314 L.kPa/mol.K)
T = 602.675 K
T in °C = K - 273.15
T = 602.675 -273.15 = 329.5 °C
T = 330 °C
