Answer:
1. Hot air rises and cold air descends for exactly the same reason
Matter are anything that is made up of atoms. The quantity of matter can be seen only on the basis of mass and volume calculation. Therefore, warm air rise and cold air sink.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science.
Matter is anything that is made up of atoms. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter.
Warm air rises while cold air descends. This is because hotter air takes more energy than cooler air. Furthermore, hot and cold temperatures are precisely proportionate to their density. As a result, when it's really hot, the hotter air is more likely to rise than when it's very cold.
Therefore, warm air rise and cold air sink.
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Match each chemical reaction with the type of reaction that best describes it
Explanation:
Types of Chemical ReactionCombination Reaction.Decomposition Reaction.Displacement Reaction.Double Displacement Reaction.Oxidation and Reduction Reaction.stay safe healthy and happy.Convert 2.3 atm to psi
Answer:=33.8 psi
Explanation:
Answer:
33.8007 (i think)
Explanation:
A mass of 68.45 g of nickel (II) sulfate hydrate, NiSO4∙ nH2O, loses 28.40 g upon dehydration. What is the hydration number of this compound? (Find n.)
Answer:
n=4
Explanation:
n= (154.75×28.40)÷(68.45×18)
n=3.5
n=4(approximately)
Identify the element that cannot participate in nuclear fission reactions. (Hint: Think about the size of the atom.)
A.
hydrogen
B.
uranium
C.
thorium
D.
plutonium
Explain how the percentages of nitrogen , oxygens and carbon dioxide in the earth atmosphere today have changed from the earth
Answer:
See below
Explanation:
The atmosphere of the earth hundreds of millions of years ago was only water vapour and carbon, both from the one ocean that existed around the continental body of Pangea. The photosynthesis process and exache (⊕) caused the percentages to decrease.
Alternative fuel sources such solar and wind energy are gaining popularity and replacing fossil fuels in many applications. While there are many positive benefits to this technology, what negative impacts do they present?
Answer:
Environmental limitations.
Explanation:
The nonrenewable sources of energy include coal, oil natural gas, and nuclear power. While the renewable source of energy include tidal, solar, geothermal, and wind power. All the sources of nonrenewable energy are called fossil fuels. There are many positives of this alternate energy such as clean and clear energy. Though there may be some negative impacts such as land use changes for setting up solar panels, and windmill farms. These techniques are costly to maintain and implement in all sectors.bicarbonato es metal o no?
Answer:
La palabra bicarbonato es un término químico para referirse a una sal ácida del ácido carbónico en combinación con un metal. ... Pero si sólo está sustituido un átomo de hidrógeno por el metal, entonces obtenemos un bicarbonato o carbonato ácido, por ejemplo, bicarbonato sódico: CO3H Na.
I'm like a highway system in your body. I carry necessary supplies to the parts of your body that need llen, allu
carry away wastes so your body can get rid of them. I contain blood vessels and am a system with a lot of heart.
What system am I?
1:digestive system
2:circulatory system
3: muscular system
4:skeletal system
plssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss sssssssssssssssssss sssssssssssssssssss sssssssssssssssssss sssssssssssssssssss answer this correctly
Answer:
The circulatory system
Explanation:
Hope this helps
if irons temp goes from 50c to 75c in a 20g sample how many joules of heat were used
Answer:
224.5J
Explanation:
Using the formula as follows:
Q = m × c × ∆T
Where;
Q = amount of heat (J)
m = mass of substance (g)
c = specific heat capacity.
∆T = change in temperature (°C)
According to this question;
m = 20g
∆T = 75°C - 50°C = 25°C
Q = ?
c of iron = 0.449 J/g°C
Using Q = m × c × ∆T
Q = 20 × 0.449 × 25
Q = 224.5J
What does the line with “alternating spikes and semicircles” mean?
Answer:
The line with spikes and semicircles is a stationary front, it brings days of steady rain.
Explanation:
L means Low pressure, it brings stormy weather with strong winds.
H means High pressure, it brings fair weather and light winds.
The line with spikes is a cold weather front, it brings thunderstorms and colder
temperatures.
The line with spikes and semicircles is a stationary front, it brings days of steady rain.
What effect does the Earth's surface have on solar radiation?
Answer:
Thus, the proportion of Earth's surface that is covered by ice and snow affects how much of the Sun's solar radiation is absorbed, warming the planet, or reflected. Therefore, snow and ice which are covered in soot from pollution no longer reflect sunlight, but absorb it and so melting increases.
Answer:
Half of the solar radiation is absorbed and converted to infrared (heat).
Explanation:
PLS HELP ASAP NO LINKS WILL MARK BRAINLIEST IF CORRECT
What is the toxic life of nuclear waste?
10,000 years
100,000 years
100 years
1 million years
Answer:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.
Explanation:
In comparison to other toxic industrial waste, nuclear waste is neither exceptionally dangerous nor difficult to manage. It is technically possible to dispose of high-level radioactive waste safely. The toxic life of nuclear waste is 10,000 years. The correct option is B.
Waste is no longer dangerous if radioactive material has adequately decomposed. However, it will take the radioactive material between a few hours and hundreds of millions of years to decay.
Breeder reactors produce plutonium-239, which has a half-life of 24,400 years and is exceedingly hazardous in even minute amounts. Cesium-137 and strontium-190 are low-level radioactive wastes from typical nuclear power facilities.
Thus the correct option is B.
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An artificial biosphere is an enclosed area that contains the elements necessary for human life to exist. Suppose scientists want to develop an artificial biosphere on a new planet. The new planet has an atmosphere that is 96% carbon dioxide with only trace amounts of oxygen. What could humans do to make enough oxygen to survive? Explain your answer.
Answer:
See Explanation
Explanation:
A biosphere is a zone of life found on earth. Since the artificial biosphere has all the elements that support and sustain human life, then there must also be soil in the artificial biosphere.
If that is the case, then we can engage in massive tree planting. Trees take in carbon dioxide and release oxygen. Hence if a large number of trees are planted all over the artificial biosphere, the trees will eventually produce large enough oxygen to support human life overtime.
Please help!!!! Best answer will get brainliest
Answer:
covalent network
Explanation:
trust me on this one
Can someone give me an example of a synthesis reaction that is NOT a redox reaction? Pls don't send links. Thanks
Well an example is how hydrogen and oxygen react to form water, you could use that. We know that when two nonmetals react more than one product is possible. Sulfur and oxygen react to form sulfur dioxide or sulfur trioxide.
Hope this helps.
How many atoms are in 1.204x10^22 moles of arsenic?
Answer:
0.02 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{1.204 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.02[/tex]
We have the final answer as
0.02 molesHope this helps you
i would appreciate it if someone could show me the net ionization reaction for the following equation:
CaCl2(aq) + 2NaHCO3 -> CaCO3 + 2NaCl + CO2 + H2O
thanks in advance!!
Answer:
Deduce the balanced chemical equation:
CaCO3(s) + 2HCl(aq) > CaCl2 + H2O(l) + CO2(g)
2. Write as ionic species:
Ca2+(aq) + CO3 2- (aq) + 2H+ + 2Cl- > Ca2+(aq)+ 2Cl-(aq) + H2O(l) + CO2(g)
3. Identify ions on the right that also appear on the left, and eliminate them. (As Robert Cruikshank says, these are known as ’spectator ions’ and take no overall part in the reaction):
CO3 2- (aq) + 2H+(aq) > H2O(l) + CO2(g)
This is the balanced ionic equation.
is smoke a compound or a mixture? explain your answer.
Explanation:
hope it is helpful to you ☺️
Determine the mass of MgCl2 needed to create a 100. ml solution with a concentration of 3.00 M.
Explanation:
[tex]1000ml \: contain \: 3 \: moles \\ 100 \: ml \: will \: contain \: ( \frac{100 \times 3}{1000} ) \: moles \\ = 0.3 \: moles \\ RFM = 95 \\ 1 \: mole \: weighs \: 95 \: g \\ 0.3 \: moles \: weigh \: ( \frac{(0.3 \times 95)}{1} \: g \\ = 28.5 \: g \: of \: magnesium \: chloride[/tex]
What is the mass number and atomic number of Ca0
Answer:
56.0774g/mol
Explanation:
hope you like it ☺️
Use the following periodic table to identify the letter(s) that match each of the statements below.
(Each element may be used once, more than once or not at all)
Answer:
l and t
Explanation:
because they are in group one
Answer:
L & T
since are found in the same group.
If you diluted 120 mL of 1,049 M NaCl to 1,920 mL, what would
be the new concentration of NaCl? Don't put units into your
answer.
Answer:
65.56 M
Explanation:
Using the formula as follows:
C1V1 = C2V2
Where;
C1 = initial concentration (M)
C2 = final concentration (M)
V1 = initial volume (L)
V2 = final volume (L)
According to the information in this question,
C1 = 1,049 M
C2 = ?
V1 = 120 mL
V2 = 1,920 mL
Using C1V1 = C2V2
1049 × 120 = C2 × 1920
125880 = 1920C2
C2 = 125880 ÷ 1920
C2 = 65.56 M
. Water is one of our most important resources. Only about 1% of the Earth's water is for human needs. Name four ways you can help conserve water. This is for science btw...
Answer:please see explanation for answers
Explanation:
Water conservation is an approach geared towards controlling how water is used. Because of the ever growing population, which weighs so much on water available to mankind,Over negligence and abuse of our water resources have been a great point of concern, that is why the need for the knowledge of water conservation is preached.
Now, some of the ways we can conserve water include
1. Putting off taps while lathering the hands with soap
2.use of irrigation system to water crops and plants
3.. while brushing, make sure to turn off the tap or faucet
4. use a shower rather than a bath
water, soil, temperature, space
Answer:
wdym??
Explanation:
Answer:
wdym by water, soil, temperature, space?
you had a 5 gram sample , how much of the original substance would remain after 1 half- life?
what is the half life though?
Please help!!!! Best answer will get brainliest.
Answer:
ionic
Explanation:
I don't know if this correct
A toy balloon is filled to 135 mL at a temperature of 22.5 °C (295.5 K). What temperature in Kelvin does it need to be heated to expand to 250 mL?
Answer:
T2 = 547.2K
Explanation:
Given:
V1 = 135 ml. V2 = 250 ml
T1 = 295.5K. T2 = ?
Using Charles's law and solving for T2,
V1/T1 = V2/T2
T2 = (V2/V1)T1
= (250 ml/135 ml)(295.5K)
= 547.2K (or 273.2°C)
How much 0.05 M HCl solution can be made by diluting 2L of 10 M HCl?
Answer:
400 L
Explanation:
As this problem deals with a dilution process, we can use the following formula:
C₁V₁=C₂V₂Where subscript 1 stands for the concentrated concentration and volume, while 2 stands for the diluted values. Meaning that in this case:
C₁ = 10 MV₁ = 2 LC₂ = 0.05 MV₂ = ?We input the data:
10 M * 2 L = 0.05 M * V₂And solve for V₂:
V₂ = 400 LA mixture of He, Ne, and Ar has a pressure of 14.9 atm at 28.0 °C. If the partial pressure of He is 1.43 atm and the partial pressure of Ar is 4.45 atm, what is the partial pressure of Ne?
Answer: The partial pressure of Ne is 9.02 atm.
Explanation:
Given: Total pressure = 14.9 atm
Partial pressure of He = 1.43 atm
Partial pressure of Ar = 4.45 atm
Partial pressure of Ne = ?
According to the Dalton's law of partial pressures the total pressure exerted by the a number of gases in a mixture is equal to the sum of partial pressures of each gas present in the mixture.
Now, for the given mixture the partial pressure of Ne is as follows.
Total pressure = Partial pressure of He + Partial pressure of Ar + Partial pressure of Ne
Substitute the values into above formula as follows.
Total pressure = Partial pressure of He + Partial pressure of Ar + Partial pressure of Ne
14.9 atm = 1.43 atm + 4.45 atm + Partial pressure of Ne
Partial pressure of Ne = 14.9 atm - 5.88 atm
= 9.02 atm
Thus, we can conclude that the partial pressure of Ne is 9.02 atm.
Which wave has the highest frequency?
1
2
3
4
no link or i will report
Answer:
4
Explanation:
because number 4 moves continuous