74 mph (64 KT)
Explanation:
when the wind exceeds 74 mph (64 KT), the storm is considered to be a hurricane.
When is pressure-volume work said to be done on a system?.
Write a balanced chemical equation for the following reactions:
1) Calcium hydroxide+ Carbon dioxide → Calcium carbonate + water
A feather gently floats on a pool. Which of the following statements best explains why the feather stays on top of the water?
Answer:
The water molecules are held tightly together by hydrogen bonding.
Explanation:
This bond gives surface tension to the water, therefore causing the feather to float.
What element is found in Group 16 and Period 3?
Answer:
sulfur is found in group 16 period 3
Rocky is a dog used to help investigate crime scenes involving fire. What is Rocky MOST likely trained to do?
a. he can test the scene for carbon monoxide.
b. He can detect the scent of cigarettes and matches
c. He can find a fire's polnt of origin by sniffing for it.
D. He can smell the scene to find flammable liquids,
Answer:
The answer is D. He can smell the scene to find flammable liquids.
Explanation:
He will smell an object then find the liquid that could of led to it.
A potential energy diagram is shown
What is the total change in enthalpy of this reaction?
we know that,
AᵣH = (Sum of enthalpies of products)-(Sum of enthalpies of reactants)
AᵣH = 55kJ - 30 kJ
AᵣH = 25kJ
or
AᵣH =( Activation Energy-Reactant energy) +( Activation Energy-product energy)
AᵣH =(65kJ -30kJ) +(65kJ-55kJ)
Since there's a degrade , we'll consider the PE of product as -veAᵣH = 35kJ - 10kJ
AᵣH = 25kJ
Answer:
B. 25 kj
Explanation:
Products-reactants
I took the exam
This symbol is often used to indicate that heat was applied to aid in the reaction
GUYS HELP PLEASE!
Do you think that the 24-hour wind pattern along the coastline of Hawaii would occur in other places? If so, where? Construct an argument to explain your reasoning.
Answer:
The answer is yes! The Wind Pattern also known as trade winds. It can occur in other places near 30 Degrees to the north and south. for example In the east side Europe, Turkey, and Africa can all have trade winds And in north Algeria, Libya, Egypt, and Israel can also have trade winds.
I hope this helps!! :D
Why do you see a flash of lightning before you hear the thunder during a storm?
Answer:
the speed of light travels much faster than the speed of sound.
Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.
Which statement best describes these three components of air?
Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.
Oxygen, nitrogen, and carbon dioxide cannot react with another substance.
Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.
Oxygen, nitrogen, and carbon dioxide can be classified as elements
Answer:
Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.
other answer wrong coz carbon dioxide can be broken down into 1 Carbon, 2 Oxygen
Explanation:
The statement that best describes these three components of air is as follows:
Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.Thus, the correct option for this question is A.
What is Air?Air may be defined as the combination of invisible, odorless, and tasteless gases such as oxygen, nitrogen, carbon dioxide, etc. that significantly surround any celestial body like the earth.
A pure substance may be characterized as a type of substance that does not have to be a single chemical element. Due to this, water, nitrogen, carbon dioxide, oxygen, etc. are the valid and most accurate examples of pure substances.
The homogeneous mixture or combination of gases like air can also be remarkably considered a pure substance. It is up to the point until there is no change of phase.
Therefore, oxygen, nitrogen, and carbon dioxide are all classified as pure substances is the statement that best describes these three components of air. Thus, the correct option for this question is A.
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A compound is 52.0% zinc 9.6% carbon and 38.4% oxygen. Calculate the empirical formula of the compound.
Answer:
So a compound is 52% Zinc(Zn), 9.6% Carbon(C), and 38.4% Oxygen (O). Let’s first start off by assuming that we have 100 g of this compound. This means that we have 52 g of Zinc, 9.6 g of Carbon, and 38.4 g of Oxygen.Zinc = 65.38 g/molCarbon = 12 g/molOxygen = 16 g/molThis means we have:52 g of Zn(1 mol Zn/65.38 g of Zn) ≈0.8 mol of Zn.9.6 g of C(1 mol C/12 g of C) = 0.8 mol of C38.4 g of O(1 mol of O/16 g of O) = 2.4 mol of O.
Explanation:
What we want to do next is divide each element by the common factor of all of them, which is 0.8. In most cases, you divide each element by the element with the least amount of moles. After we divide each by 0.8, you’ll notice you have 1 Zn, 1 C, and 3 O. This gives you the empirical formula of ZnCO3, or Zinc Carbonate.
If an atom has five protons, five neutrons, and five electrons, what is the overall charge of the atom?
Answer:
neutral
Explanation:
cause the all balance out
ASAPPP
What information does a flame test provide?
O A. The temperature that causes emissions
B. The emission spectrum of an element
C. The absorption spectrum of an element
Answer:
B. The emiision spectrum of an element
Explanation:
just took the test
Answer:
b
Explanation:
What does the ozone layer protect the earth against?.
Edwin rotates the Moon around the Earth to show a full month. After one full revolution around the Earth, the Moon casts a shado
on the Earth again. Another student states that if this models the Sun, Earth and Moon correctly, then a solar eclipse would happe
once a month.
Edwin found out a solar eclipse happens about once every 18 months. How should Edwin improve his model to better represent
how often eclipses occur?
OA. He should make both the Earth and the Moon spin on their tilted axes.
OB.
He should make the Sun a large, round object.
OC. He should make the Moon orbit Earth at an angle to the table, and not parallel
Answer:
C
Explanation:
Parallel makes the shadow happen every month
non parallel would be less frequent
He should make the Moon orbit Earth at an angle to the table, and not parallel. So, the correct option is C.
What is an orbit?The curving path that an object in space takes around another object as a result of gravity is known as an orbit. Moons orbiting planets, planets orbiting planets, and artificial satellites orbiting the Earth are examples of objects where this is frequently seen.
A route that an object in space follows around another is known as an orbit. A satellite is a thing that orbits the earth. An Earth- or moon-like natural satellite is one possibility. Moons are satellites that orbit many planets. A man-made satellite is also possible, such as the International Space Station.
The solar system's planets, comets, asteroids, and other celestial bodies revolve around the sun. The majority of solar system objects travel along or very near a hypothetical flat surface. The ecliptic plane is the name given to this hypothetical plane.
Therefore, the correct option is C.
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An ion has 56 protons, 54 electrons, and 81 neutrons. What is its atomic number ?
The Atomic Number indicates the number of protons = 56
A stock solution is 5.00 M. How much of the stock solution in mL should you dilute to 100 mL, to make a 0.200 M solution
Answer:
4ml
Explanation:
using;C1V1=C2V2
5V1=0.2×100
5V1=20
V1=20/5
V1=4ml
36. (Higher) 2Mg + O2 → 2Mgo. Limiting reactant is Mg (4 mol). What is the amount of
product (in mol)? PLEASE HELP ME HOW TO WORK THESE OUT!!
Answer:
4 mol MgO
Explanation:
convert the limiting reactant to product by using dimensional analysis in order to see how many moles total can be created of the product
4 mol Mg x [tex]\frac{2 mol MgO}{2 mol Mg}[/tex] = 4 mol MgO
What is the percentage by mass of water in the compound FeCl3 • 6H20 ?
Answer:
52.12%
Explanation:
First you need to find the mass of the total molecule. The mass of one atom of Fe is 55.847. The mass of one atom of Cl is 35.453. The mass of O is 16.00, and the mass of H is 1.00. The mass of the whole atom is calculated as follows:
55.847 + 3(35.453) + 6(16.00)+ 12(1.00) = 270.206.
Next calculate the mass of water in the molecule:
(2)1.00 + 16.00 = 18.00(6 molecules) = 108
Finally, divide the mass of water by the mass of the whole molecule and multiply by 100 to get it as a percent:
108/207.206 = 0.52122 x 100 = 52.12%
1. How many mL of copper (II) sulfate of a 2.5M stock solution is needed to make 250 mL of 0.2M solution?
Answer:
20ml
Explanation:
using the formula;C1V1=C2V2
2.5×V1=0.2×250
2.5V1= 50
V1=50/2.5
V1=20L
5 points IF U ANSWER THE QUESTION CORRECTLY
Why does everyone in the world hate u? No matter what u do or say ur never perfect enough for them why is that?
Answer:
No matter how well how much you accomplish, or how much good you put into the world, you will always have haters. An unfortunate aspect of life is that some people hate when others do well.It’s just a way of life.some people just are jealous but dont let people brake you down.
Explanation:
hope this helps
What is the concentration of a solution in
which 60 g of NaCl are dissolved in 1.0 L of water?
Answer:
6%
Explanation:
60 g / 1000 g = 6%
The concentration of a solution in 60 g of NaCl are dissolved in 1L of water will be 6%.
What is concentration?The abundance of an ingredient ratio of the volume of a combination is called concentration. Mass concentration, molar concentration, number concentration, and volume concentration are all examples of mathematical descriptions.
Concentration can be calculated as:
C=m/V.
where, C is concentration , m is mass and V is volume.
It is given that, m = 60 g and V = 1L or 1000 mL.
Now, put the value of given data in above equation.
C= 60/1000
=6%.
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Calculate the solubility of carbon dioxide at 400 kPa.
Select one:
O a. 9.48 CO2/L
O b. 0.61 CO2/L
O c. 94.87 CO2/L
O d. 6.08 CO2/L
The solubility of carbon dioxide at 400 kPa at room temperature is ;
( B ) 0.61 CO2/L
Given data
pressure of CO₂ = 400 Kpa = 3.95 atm
Kh of CO₂ = 3.3 * 10⁻² mol/L.atm
Calculate the solubility of carbon dioxideSolubility = pressure * Kh value of CO₂
= 3.95 atm * 3.3 * 10⁻² mol / L.atm
= 0.13 mol/l CO₂
= 0.61 CO₂ / L
Hence we can conclude that the solubility of CO₂ at 400 kPa is 0.13 mol/l CO₂.
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From the options the closest answer is ( B ) 0.61 CO₂ / L
under what temperature will volume of gas at 0 degree celcius double itself if the pressire is kept constant ????
Answer:
273.15° C
Explanation: Ideal gasses tend to double in volume when their temperature doubles. 0°C = 273.15K so double 273.15 gives 546.3K.
Converting back to Celcius
546.3-273.15 =273.15°C
How do you think plants would grow in space? Which tropism(s) would be affected and why?
Answer:
In the absence of gravity, plants use other environmental factors, such as light, to orient and guide growth. A bank of light emitting diodes (LEDs) above the plants produces a spectrum of light suited for the plants' growth.
Someone pls help me. I will mark you brainliest.
Answer:
Lighter-colored objects emit more light, and darker colored objects absorb more light. The more light an object absorbs, the more it heats up when it is exposed to light, which is why dark things get hot more quickly than light things if left out in the sun
Explanation:
An ion has 56 protons, 54 electrons, and 81 neutrons. What is the
element's symbol?
Explanation:
The barium – 137 cation would have 56 protons, 54 electrons and 81 neutrons.
Which is the following is a decomposition reaction
The equation that is a decomposition reaction is
PbCO3(s) ---> PbO(s) + CO2(g)
That is option D. The properties of a decomposition reaction can further be understood below.
Properties of a decomposition reactionA chemical reaction is defined as the combination of substances called reactants to form a product. The various types of chemical reaction include:
synthesis reactioncombustion reactiondecomposition reactionsingle or double replacement reactionDecomposition reaction is that type of chemical reaction in which the reactant breaks down to form two or more products.
Therefore the heating of lead (II) carbonate is a decomposition reaction.
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The concentration of minerals in veins usually involves: Multiple Choice metamorphism. hot fluids. enrichment through crystal settling. mechanical weathering.
As the minerals are carried through the veins of the rock, they could settle there causing enrichment through crystal settling.
Minerals in veinsMinerals in rocks could be dissolved in aquoeus solutions in the rocks. When this occurs, the solutions could be carried through the veins in the rock.
As the minerals are carried through the veins of the rock, they could settle there causing enrichment through crystal settling.
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In response to an aspirin (acetylsalicylic acid) overdose, you would expect to observe which acute compensatory response
Compensatory responses are the compensation mechanism that maintains the body's fluid levels. The increased alveolar ventilation is seen in aspirin overdose.
What is an aspirin overdose?Aspirin or acetylsalicylic acid is a general pain reliever that can cause poisoning when overdosed. It results in tinnitus, hyperventilation, increased heart rate, low blood pressure, fever, dehydration, etc.
Aspirin toxicity decreases the pH making the blood more acidic causing increased ventilation through alveoli to remove the excess carbon dioxide to balance the pH levels.
Therefore, in aspirin poisoning, the increased alveolar ventilation is the acute compensatory response.
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