I have attached an image. You can see the answer choices as well as the question. Pls help me. 25 points
Answer:
B
Explanation:
When it freezes, it will be a solid. The molecules will barely move, not as much as in the other answer choices.
Plants use water to make sugar during the process of transpiration true or false please help out thanks
Answer: False
Explanation:
During Photosynethsis plants use sugar to make food.
The diagram below shows a group of water molecules.
The water molecules in the diagram are attracted to each other by
Answer:
hydrogen bonds, the positive and negative charges of the hydrogen and oxygen atoms that make up water molecules makes them attracted to one another.
What pressure is exerted by 1.11 mol of hydrogen gas in a 8.17 L container at 50◦C?
Answer in units of atm.
Answer:
20.0
Explanation:
A 1.83 mol sample of carbon reacts with excess zinc oxide to produce zinc and carbon dioxide. How many moles of zinc oxide are consumed?
Answer:
3.66 moles of Zinc Oxide are consumed
Explanation:
Based on the reaction:
C + 2ZnO → 2Zn + CO₂
Where 1 mole of Carbon reacts with 2 moles of Zin Oxide to produce 2 moles of Zinc and 1 mole of Carbon Dioxide.
To solve this question, we must convert the moles of carbon added to the moles of Zinc Oxide that react using the chemical equation (1mol C = 2mol ZnO):
1.83 moles C * (2mol ZnO / 1mol C) =
3.66 moles of Zinc Oxide are consumedwhat kind of elements form ionic compounds?
Answer:
Ionic compounds generally form between elements that are metals and elements that are non metals. For example, the metal calcium (Ca) and the non metal chlorine (Cl) form the ionic compound calcium chloride (CaCl2). In this compound, there are two negative chloride ions for each positive calcium ion.
Explanation:
Mark as brainliest
72 drops were 1ml for stearic acid
the container was 8.5 cm wide and filled with hexane
Trial 1 was 20 drops
Trial 2 was 21
trial 3 was 16
The concentration of steric solution in hexane was :1.64*10^-4 g/ml
Area of single molecule of steric acid is: 0.21 mn^2
Molar mass of steric acid is: 284 g/mol
-What is the moles of stearic acid used?
-What is the number of stearic acid used to make the lens?
-how many molecules of stearic acid would there be if its it was 1 mole of stearic acid on that lense?
CaseAnswer:
-Mole of stearic acid used = 1.3*10^-3 mol
-Molecules of stearic acid there would be in 1 mole of stearic acid = 7.994*10^20 molecules
Explanation:
Know information from the problem are:
Mass concentration of C18H32O2 = 1.6x10^-4 g/ml, Molar mass of C18H32O2 = 284 g/mol.
Unit factor from drops to ml is 72 drops = 1ml. Therefore, for every drop, n, given, there would be n drops (1ml/ 72drops). The problem tells that stearic acid was added to hexane and that the addition process was done three-time with different amounts of drops. Think of this as releasing a substance from a burette during titration. If we convert the drops into millimeters, we would have 20 drops (1ml/72drops)= 0.28 ml, 21 drops (1ml/72drops)= 0.29 ml, and 16 drops (1ml/72drops)= 0.22 ml. [We need these volumes to determine the mass of stearic acid from mass concentration given.]
Unknown informations are:
V (volume in ml) =?
The mole of stearic acid used =?
Strategy
To calculate the mole of stearic acid used, we need the mass of stearic acid from the mass concentration. To get this we need a volume. Notice that those volumes (drops) are not the same ( it is safe to say that there is an error in the readings, as they were done independently). Therefore, we would find two or three values whose difference is smaller ( there is a little error). Subtract the smaller number from the larger number till you get a smaller difference ( do this for all three values).
The set of numbers with the smallest difference is 0.29 - 0.28=0.014, our concordant value.
Solutions
Now we us this set of numbers, 0.29-0.28, to determine an average volume :
V = (0.29-0.28)/2 (ml)
V= 0.285 ml
Now we can calculate the mass of stearic acid from the mass concentration:
m = C*V; m is the mass, C is the concentration in g/ ml, and V is the volume in ml.
m = (1.64*10^-4 g/ml)*(0.285 ml)
m = 4.674*10^-5 g
The mole of stearic acid used:
n = m/MM l; n is the mole of stearic acid, m is the mass of stearic acid, and MM is the molar mass of stearic acid.
n = 4.674*10^-5 g (284 g/mol)
n = 1.3274*10^-3
How many molecules of stearic acid would there be if it was 1 mol of stearic acid?
1 mol = 6.02214*10^23 molecule
Therefore, a conversion fraction would be:
6.02214*10^23 molecule/ 1 mol
Solution
Molecules of stearic acid in 1 mol =
1.3274*10^-3 mol (6.02214*10^23 molecule/ 1 mol)
= 7.994*10^20 molecules in 1 mol of C18H16O2
why does the earth experience seasons?
9. Which indicator would show a pH change from 6 to 7?
Phenol red indicator
Blue litmus indicator
Red litmus indicator
Methyl red indicator
Will give brainliest!!!!
Answer:
hi
Explanation:
because
Materials that do not allow electrons to flow easily are called _____________.
Answer:
Materials that do not let current flow easily are called insulators.
Most nonmetal materials such as plastic, wood and rubber are insulators
A model is simplified version of a more complex idea or system. It useful to help us understand something we can't actually see
A) true
B) false
Answer:
I feel like the answer is A) true
Explanation:
you create a model to help your audience understand your complex idea. There have been models made to represent ideas that we cannot see.
Scientists developed a device capable of lowering temperatures in order to slow molecular motion to almost a complete stop. Which of these temperatures is theoretically able to make this happen?
0 K
0°C
273 K
273°C
Answer:
273k
Explanation:
Soooo... This is a complicated problem.
I dunno. Like... Is this a trick question? Trivia, maybe?
Nahhhhh...
It's just not telling us facts...SOME facts, but we need to use past learning to help us.
FIRST of all, what the heck does K even mean?
Is this a memo? A demo? A KO?
Okay, it's nither of these things.
So, let me tell you what the "K" means.
The K means "Kelvin" which is basically a word form for "-"
I AM NOT MAKING A FACE. IT'S THE WORD FORM FOR MINUS. STOP LAUGHING!!!!
And so... To bring objects to a COMPLEETE SKRRRRRRRRRRRRRRRRRRRRRRT...
It will need to be -273.
This means that the answer is 273k.
Which reminds me, Ima play 2k.
And ima rap to-day.
And now I'm being lame.
Just answer the question :/
How do you name branched-chain alkanes?
Answer:
Explanation:
Branches or side chains are called alkyl radicals, they are named substituting the termination -ano for -yl or -il when it is part of a hydrocarbon.
distinguish between electron and neutron
Answer:
Explanation:
Electrons are a type of subatomic particle with a negative charge
Neutrons are a type of subatomic particle with no charge (they are neutral)
When a reaction is balanced we know that the number of _______ is the same on both sides of the reaction.
Answer:
Atoms I think
Explanation:
When an equal number of atoms of an element is present on both sides of a chemical equation, the equation is balanced.
can i get a snap i could send a link to, to do a few chem 1 assignments i could award more points
Answer:The FitnessGram PACER Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The test is used to measure a student's aerobic capacity as part of the FitnessGram assessment. Students run back and forth as many times as they can, each lap signaled by a beep sound.
Explanation:
Some vitamins and dietary supplements are stored in opaque, darkened
bottles to protect them from UV light because UV light would cause a
reaction. Which word could be used to describe UV light in this situation?
O A. Catalyst
B. Enzyme
C. Solvent
D. Reactant
The correct option for the given question about Harmfull effect of UV light is Option D) Reactant.
Why UV light is so harmfull for some vitamins?In general, temperature, oxygen, and light impacts on vitamins and minerals are sensitive. A nutrient can lose its biological potency if its molecular structure is slightly altered.Numerous vitamins, including vitamin A, vitamin B2 (riboflavin), vitamin B6, vitamin B12, and folic acid, are known to be particularly susceptible to UV radiation oxidation.Additionally, light speeds up the negative interactions between vitamins.For instance, the combination of riboflavin and light together speeds up the breakdown of both folic acid and vitamin C. This is what causes milk that has been exposed to light to lose vitamin C.Thus to conclude we can say that UV light damages some vitamins by reacting with them.
Learn more about Harmfull effect of UV light here:
https://brainly.com/question/11126315
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Metals are considered to be ___________________ because they let electricity flow.
Group of answer choices
conductors
circuits
currents
insulators
Answer:
conductors
Explanation:
Because they consist of lattice of atoms with free electrons and these free electrons allows current to flow through.
24
Select the correct answer.
Which statement is correct?
A.
When the concentration of the reactant decreases, the cell potential increases.
B.
When the concentration of the reactant decreases, the cell potential does not change.
C.
When the concentration of the reactant increases, the cell potential decreases.
D.
When the concentration of the reactant increases, the cell potential increases.
E.
When the concentration of the reactant increases, the cell potential does not change.
Answer:
the answer is b
Explanation:
When we look at heat transfer problems that include phase transitions, there can bemanynec-essary steps. Consider a material of massmthat undergoes two phase transitions: from solid toliquid and then from liquid to gas. It starts at an initial temperature ofT0(well below the meltingtemperature ofTm) and it heated until it is a gas at a temperature ofTf(well above the boilingtemperature ofTv). How many different steps (simple temperature changes or phase transitions)of heat transfer would you need for this problem
Answer:
There would be 3 temperature changes and 2 phase transitions
Explanation:
The temperature of the material would first increase from T0 to Tm (its melting point)- This is one temperature change.
It would the change from solid to liquid at its melting point Tm.- This is one phase transition.
Its temperature would then increase from its melting point Tm to its boiling point Tv -This is another temperature change.
It would then change from liquid to gas at its boiling point Tv - This is another phase transition.
Finally, its temperature would then increase from its boiling point to T(f) - This is the third temperature change.
So, there would be 3 temperature changes and 2 phase transitions
Absorption occurs when light waves strike a medium and are neither reflected nor refracted, nor are they allowed to ___________
Answer:
When light waves strike a medium and are neither reflected or refracted, nor are they allowed to pass through.
Explanation:
______ is the tendency of an organism to maintain a constant and stable internal environment
Answer:
Homeostasis is the answer
Explanation: it maintains a constant and stable environment
How many atoms does 9.3 moles of Mo represent?
Answer:
5.60 × 10²⁴ Mo atomsExplanation:
The number of atoms can be found by using the formula
N = n × Lwhere 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
N = 9.3 × 6.02 × 10²³
We have the final answer as
5.60 × 10²⁴ Mo atomsHope this helps you
Please please please please please please help me a b c or d
Answer:
the answer for this one is the distance the car is driven
Weathering (breaking off sediments upriver), erosion (moving the sediments down river) and finally deposition caused the changes in the river.
What helps hold sediments in place to prevent erosion?
Answer:
Explanation:
Maintaining a healthy, perennial plant cover.
Mulching.
Planting a cover crop – such as winter rye in vegetable gardens. ...
Placing crushed stone, wood chips, and other similar materials in heavily used areas where vegetation is hard to establish and maintain.???
C2H2 +
02 -->
CO2 +
H20
Answer:
Explanation: This reaction is called a synthesis reaction. This is because a synthesis reaction is when two or more reactants combine/react together to form a single product. The two reactants carbon (C) and oxygen (O2) reacted together to form one single product: carbon dioxide (CO2)
Why do you think we use heat to dissolve sodium tetraborate?
Answer:
Explanation:90% of people marry there 7th grade love. since u have read this, u will be told good news tonight. if u don't pass this on nine comments your worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of your life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love u this is irrelevent but idrc lol
Which statement below is false when 10 g of nitrogen reacts with 5.0 g of hydrogen to produce ammonia?
N2 (g) + 3 H2 (g) → 2 NH3 (g)
Answer:
The theoretical yield of ammonia is 15 g.
Explanation:
The statements are:
2.8g of hydrogen are left over.
Hydrogen is the excess reactant.
Nitrogen is the limiting reactant.
The theoretical yield of ammonia is 15 g.
To solve this question we must find the moles of each reactant. Thus, we can find the limiting reactant. With limitinf reactant we can find the theoretical yield and the amount in excess of the reactant that is in excess:
Moles Nitrogen -28g/mol-
10.0g * (1mol / 28g) = 0.357 moles
Moles hydrogen -2g/mol-
5.0g * (1mol / 2g) = 2.5 moles
For a complete reaction of 0.357 moles of nitrogen are required:
0.357mol N2 * (3mol H2 / 1molN2) = 1.071 moles hydrogen.
As there are 2.5 moles of hydrogen, hydrogen is the excess reactant and nitrogen is the limiting reactant
The moles of hydrogen that are left over are:
2.5moles - 1.071moles = 1.429moles Hydrogen
The mass is:
1.429moles Hydrogen * (2g / mol) = 2.8g of hydrogen are left over
The moles of ammonia produced are:
0.357mol N2 * (2mol NH3 / 1molN2) = 0.714 moles of ammonia are produced (Theoretical moles)
The theoretical mass is (Molar mass NH3 = 17g/mol):
0.714 moles of ammonia * (17g / mol) =
12g of ammonia is the theoretical mass
The false statement is:
The theoretical yield of ammonia is 15 g.The false statement, when 10 g of nitrogen reacts with 5.0 g of hydrogen to produce ammonia is that the theoretical yield of ammonia is 15g.
How moles is calculated?Moles of any substance will be calculated as:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
N₂(g) + 3 H₂(g) → 2 NH₃(g)
Moles of 10g of N₂ = 10/28 = 0.357 moles
Moles of 5g of H₂ = 5/2 = 2.5 moles
From the stoichiometry of the reaction:
1 mole of N₂ = react with 3 moles of H₂
0.357 moles of N₂ = react with 3×0.357=1.071 moles of H₂
Here nitrogen is the limiting reactant and hydrogen is excess reactant, and formation of ammonia depends on the limiting reactant.
1 mole of N₂ = react with 2 moles of NH₃
0.357 moles of N₂ = react with 2×0.357=0.714 moles of NH₃
Now we calculate the mass of ammonia from the given moles as:
M = (0.714) (17) = 12 g.
Hence, the false statement is that theoretical yield of ammonia is 15g.
To know more about moles, visit the below link:
https://brainly.com/question/15356425
Captain uses a steering wheel called him to turn the rudder A sailing ship do you think it would be easier for him to turn a large wheel or a small wheel explain why you think so
Answer:
Large wheel.
Explanation:
It would be easier for the captain to turn a large wheel as compared to a small wheel because less amount of effort is needed by the captain to turn the rudder. If a steering wheel is small, more effort and force is required to turn it while on the other hand, if the steering wheel is large, small effort is needed to turn the rudder. The large size of a sailing boat's steering wheel can help the captain to have more control over the boat as compared to small steering wheel and he is able to access it from either side of the boat.
How many atoms of each element are present in methane
and propane based on their chemical formulas
Answer:
Methane has one atom of carbon and four atoms of hydrogen.
Propane has three carbon atoms and eight atoms of hydrogen.