Answer:
14.28 [tex]cm^{2}[/tex]
Explanation:
Multiply length by width to get area: 3.4 x 4.2 = 14.28
The answer will be in units of cm x cm = [tex]cm^{2}[/tex]
How do we think that Mars lost atmospheric gas?
What basic planetary property would have had to be different for Mars to retain a thicker atmosphere?
the rocky planet was exposed to harsh and forceful solar winds, which blew the Martian atmosphere away.
Another option for thickening the atmosphere of Mars, and, in turn, raising the temperature of the planet, would be to set up solar-powered, greenhouse-gas producing factories.
Antibiotics are drugs used to kill bacteria. Some bacteria develop mutations that make them resistant to
antibiotics.
Which of the following BEST explains this mutation with respect to bacteria?
The mutation is a harmful mutation since many bacteria will be killed by antibiotics
The mutation has no effect since the bacteria cannot be targeted by an antibiotic.
The mutation is a helpful mutation since it helps bacteria to survive and reproduce.
The mutation is a helpful mutation since humans can survive longer.
The mutation is a helpful mutation since it helps bacteria to survive and reproduce.
( multi choice) ( science)
What are the ways that oxygen enters our body?
A. nose
B. mouth
C. ears
D. eyes
Answer:
you can also get oxygen from the mouth but you get more from the nose so i would chose nose
Which metal in the fourth period is the least reactive? Explain your reasoning
Answer:
Krypton
Explanation:
It is a noble gas, so it isn't reactive since it already has 8 valence electrons.
1.Which of these statements about the
conservation of mass is not correct?
A.The mass of the products will be equal to the
mass of the reactants.
B.During a chemical reaction, no mass is
created or destroyed.
C.There will be the same number and type of
atoms before and after a chemical reaction.
D.All of the above are correct.
SOMEONE HELP ME PLEASE
Dispersed colloids systems have the same _________________ (on the particles) which keep the particles dispersed.
Answer:
The dispersed particles of lyophobic colloidal systems have the same kind of electric charge. Particles with like charge repel each other and their mutual repulsion prevents them from joining together and settling out. The accumulation of similar kind of charges on the suspended particles holds them part and thus stabilizes the system.
Explanation:
Sofia is doing a presentation on the history of blood analysis. Who is she MOST likely to mention in her presentation?
A. Karl Landsteiner
B. Sir Edward Henry
C. Cora Crippen
D. Trenton Luminol
Answer:
A. Karl Landsteiner is the most likely for her to mention.
Please help!!
Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars. Which type of organic compound does the train most closely model?
A. an alkyl halide
B. an aldehyde
C. an ether
D. a carboxylic acid
Answer:
C. an ether
Explanation:
1. Which location (a, b, or c) would have the highest temperature?
2. Which location(a, b, or c) would have the lowest temperature?
3. Give reasoning to explain how and why the latitude of a place on Earth affects its average temperature.
WORTH 100 POINTS! WILL MARK BRIANLESIT
Answer:
1. B
2.C
3.The further out and the closer the the equator a place on Earth is the warmer it is due to the fact that the sun directly hits countries on the equator and takes in heat faster then the north and south pole. Countries on more of a curve are colder due to the fact they are more curved and it is harder for the heat to be taken in at a curve.
B is center point line passing through earth and it's placed right infront of sun so b would have highest temperature
#2
A and C both are poles so at a and c least sun light can reach hence lowest temperature.
#3
As far as the latitude is placed from equator lower the temperatureAs near as the latitude is located from equator higher the temperatureQuestion 1 (1 point)
Mackenzie adds sodium chloride and sucrose to water. Identify the solutes.
a
sodium chloride
b
water
с
sodium chloride and sucrose
d
sucrose
The solute in this case would be sodium chloride and sucrose.
SolutesSolutes are substances capable of dissolving in solvents to give homogenous mixtures known as solutions.
In this case, both sodium chloride and sucrose were added to water - water is acting as the solvent.
Sodium chloride is soluble in water and so also is sucrose.
Thus, a homogenous mixture of sodium chloride and sucrose would result.
More on solutes can be found here: https://brainly.com/question/7932885
The atomic number of an atom or element is the number of.
Answer: the number of a chemical element in the periodic system,
Explanation:
A compound containing only carbon and hydrogen is found to contain 80.0% carbon. It has a molecular weight of 30.0. What is its molecular formula
Answer:
(80.0, 20.0) The statement states that 80% of the compound is carbon. To acheive the amount of carbon in a 100 g sample, you need to multiply the weight of the sample by the percentage of carbon in the compound. Recall that 80%=80/100=.8 .8*100g=80g of carbon. The same process goes for the hydrogen. .2*100g=20g hydrogen. Explanation:
Results in a net release of energy
Catabolic
Anabolic
Catabolic reactions break down large organic molecules into smaller molecules, releasing the energy contained in the chemical bonds. These energy releases (conversions) are not 100 percent efficient. The amount of energy released is less than the total amount contained in the molecule.
4) Type only the NUMBER answer to the question below (no units). Your
answer should have 4 significant figures.
How many grams of N202 are present in 4.5 x 1024 molecules of N2O2
I need help!
Examine the general structure of a molecule.
Which functional groups are in this molecule?
A. an alkyl halide and an alcohol
B. a carboxylic acid and an amine
C. an amine and an ester
D. an aldehyde and a carboxylic acid
Answer:
B,) a carboxylic acid and an amine
Explanation:
A functional group is an atom or group of atoms inside a molecule that has comparable chemical properties anytime it appears in numerous compounds. When other parts of the molecule are not similar, some functional groups react in certain manners.
Carboxylic acid is a carbonyl-containing functional group, with carbon atom bonded to an hydroxyl group on one side and on the other side is either a carbon or hydrogen atom.
An amine group is composed of a nitrogen atom bonded to a combination of carbon and hydrogen atoms.
Answer:
a carboxylic acid and an amine
Explanation:
At room temperature most elements are classified as.
I am assuming you are talking about their phase and in that case, they are mostly solid except for mercury and bromine.
Hope that helps!
What is the density of a cube that has a mass of 25 grams and a volume of 125 cm3
To convert it in Kg/m³ divide by 1000 and multiple with 10⁶
[tex]Density = 0.2 \: \times \frac {{10}^{6} }{10 {}^{3} } = 0.2 \times {10}^{3} \\ Density = 200 \: kg \: m {}^{ - 3} [/tex]
HELP PLEASE!!!!!! I will give 100 points!!!!!
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
In the above equation how many moles of H2SO4 can be made when 87 moles of HNO3 are consumed?
Answer:
what do you need help with .
Explanation:
?
Answer:
Based on stoichiometry HNO3 to H2O is 6:2
Use 9 grams to find the moles of HNO3
9 grams/63g/mol=0.143 moles of HNO3
HNO3:H2O
6:2
0.143*2/6=0.048
H2O moles is 0.048moles
Mass of water =0.048moles*18g/mol=0.864g
To the nearest tenth=0.9grams
( sorry if its not right)
What could happen to nearby molecules if one side of a molecule has a temporary negative charge?
Answer:
The London dispersion force is a temporary attractive force that results when the electrons in two nearby atoms of two different molecules occupy positions that make the atoms form temporary dipoles (positive or negative charge).
Explanation:
what is a substance that doesn't dissole in water
Answer:
insoluble substances
Explanation:
Currently, the primary source of sulfur dioxide emissions into the atmosphere is Group of answer choices coal burning power plants. plastic manufacturing. gasoline-powered lawnmowers. diesel trucks.
From what we know we can confirm that currently, the primary source of sulfur dioxide of emissions into the atmosphere is coal and other fossil fuel burning in industry.
What are the consequences of Sulfur dioxide in the atmosphere?From what we know, this compound has proved to be quite toxic for humans to breathe. Increased concentrations of this in the atmosphere lead to increased rates of lung disease among other health complications.
Therefore, we can confirm that the primary source of sulfur dioxide of emissions into the atmosphere is coal and other fossil fuel burning in industry.
To learn more about pollution visit:
https://brainly.com/question/1040743?referrer=searchResults
In the balanced equation Cu + 2 HCl --> CuCl2 + H2, if you start with 0.15mol Cu and 0.38mol HCl, how many moles of HCl are left over (which means unused)?
This problem is providing a chemical reaction between 0.15 mol of copper and 0.38 mol of HCl and asks for the moles of HCl that are left over. At the end, the answer turns out to be 0.08 mol.
Uses of stoichiometryIn chemistry, we define stoichiometry as a tool allowing to calculate mole-mass or mole-mole relationships between different species involved in a chemical reactions.
In this case, for 0.15 mol of copper and 0.38 mol of HCl one can apply a mole ratio in order to calculate the moles of HCl consumed by the former, considering the 1:2 mole ratio between them:
[tex]0.15 molCu*\frac{2mol HCl}{1molCu} \\\\=0.30 mol HCl[/tex]
This means that if 0.30 moles of HCl react and 0.38 moles are available, there is a left over or unused moles of:
[tex]leftover=0.38mol-0.30mol\\\\leftover=0.08mol[/tex]
Learn more about stoichiometry: brainly.com/question/9743981
How do plants affect the amount of carbon in Earth’s atmosphere?
Question 1 options:
Plants increase the levels of carbon dioxide in the atmosphere due to the process of photosynthesis.
Plants have no effect on the amount of carbon in the atmosphere
Plants decrease the levels of carbon dioxide in the atmosphere due to the process of photosynthesis.
Answer:
c
Explanation:
plants decrease the levels of carbon dioxide in the atmosphere due to the process of photosynthesis
Please help me I just need the answers please no need for the explanation
Answer:
C = q / m x dT
Explanation:
By definition, specific heat, C = heat absorbed, q divided by mass, m and change in temperature, dT
So C = q / m x dT
Answer:
The specific heat capacity of a material is the energy required to raise one kilogram (kg) of the material by one degree Celsius (°C)
Formula:
energy (J) = mass (kg) * specific heat capacity (J/kg°C ) * change in temperature
required answer:
C = q / m * dTusing the formula:
C = [tex]\frac{102}{12.5*(55-22)}[/tex]
C = 0.2473 J/kg°C
↑
This is the specific heat capacity of copper
The ph of water is approximately 7 which means it is:.
Answer: Neutral
Explanation: This is because, in the ph scale, greater than 7 indicates base or alkaline (basic), while less than 7 indicates that it is acidic.
Question 1 of 10
What does the pH of a solution represent?
A. The pH indicates how acidic or basic a solution is.
B. The pH represents the partial pressure of hydrogen gas.
C. The pH is an indicator of the salt content of a solution.
D. The pH tells how quickly a reaction reaches equilibrium.
1.A space shuttle's wings are useless as it travels around the exosphere. Explain, in your own words, why the wings are so useless and how the shuttles can move around.
2.Explain, in your own words, the thermosphere and the stratosphere are our hottest atmosphere layers.
3.Explain, in your own words, how and why “shooting stars” occur. For example, why and what causes meteors to burn up.
4.Explain, in your own words, the importance of our ozone layer in the stratosphere.
5.Explain, in your own words, why weather only occurs in the troposphere.
PLEASE HELP!!!!! Use your own words please! I will give the brainiest to the person who answers it!
Thrust acts on the spacecraft and propels in the space.
How space shuttles move?1. The force created by the shuttle's engines in expelling the burning fuel produces an equal thrust in the opposite direction. This thrust acts on the spacecraft and propels in the space.
2. The thermosphere and the stratosphere are our hottest atmosphere layers because these two layers are present near the sun as compared to other layers of atmosphere.
3. When the meteors hit the atmosphere, meteors rub against air particles and create friction which is heating the meteors. The heat vaporizes most meteors, creating what we call shooting stars.
Learn more about atmosphere here: https://brainly.com/question/24925283
Guys help me, for me this is so hard i can't search this. I Brainliest the Best Answer.
Hope you could understand.
If you have any query, feel free to ask.
i have a question so im working on a hydrology crossword puzzle and it says how acidic or basic a substance is and it only has 9 letters and its starts with p and the 3rd letter is b i need help
Answer: " PHBALANCE " .
_____________________
Explanation:
_____________________
The pH scale is logarithmic and indicates how acid or how basic a substance is.
ph balance ; as one word in a crossword puzzle,
with 9 letters ; P-H-B-A-L-A-N-C-E ; amounts to exactly 9 (nine) letters ;
And starts with a "P" ;
the 3rd letter is "B" .
_____________________
Source: Self-perception and tuition.
Hope this helps! Please let me know if the answer is correct; or if it makes sense!
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