Answer:
True
Explanation:
If you see distilled water, it's a pure substance. That means that there are only water molecules in the liquid. A mixture would be a glass of water with other things dissolved inside, like one of those powders you take if you get sick or Kool-Aid.
What method is used for chaff from grain
Answer:
Winnowing
Explanation:
Wind blows the lighter(in terms of mass) chaff from the whole grains,which are heavier(in terms of mass)
What is the steric number of H2O2?
Answer: 1(2)+6(2)=14
Explanation:
Not sure, but maybe.
In winter, soap does not dissolve properly in water.
Answer:
because of nothing...............................
Which correctly describes rain forests and deserts? A They are aquatic because they have a lot of precipitation. B They are terrestrial because they have little precipitation, c They are aquatic because they are bodies of water. D They are terrestrial because they are on land.
Answer: They are terrestrial because they are on land. so D
Explanation:
because both of them are terrestrial, not aquatic and so rainforests receive a lot of rain like 2.000 to 10,000 rain per year but deserts get less rain although that big difference makes more sense so it is option D.
HELP WILL GIVE BRAINLIEST!!!
I think the answer will be:
C. Increase the rate forward and reverse reactions equally.
PLEASE HELP ILL GIVE U MY ARM While performing calorimetry a hot Cheeto was burned in a bomb calorimeter
and increased the temperature of the water. Which of the statements is the most
correct?
Answer:
I drew an amazing picture explaining everything....
Explanation:
Hope this helps! Please let me know if you need more help, or if you think my answer is incorrect. Brainliest would be MUCH appreciated. Have a great day!
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In a school’s laboratory, students require 50.0 ml of 2.50 m h2so4 for an experiment, but the only available stock solution of the acid has a concentration of 18.0 m. what volume of the stock solution would they use to make the required solution? use m subscript i v subscript i equals m subscript f v subscript f.. 0.900 ml 1.11 ml 6.94 ml 7.20 ml
The volume of stock solution they use to make the required solution is 6.94mL.
How we calculate the volume?To calculate the value of required volume we will use the below equation:
M₁V₁ = M₂V₂, where
M₁ = molarity of stock solution = 18M
V₁ = volume of stock solution = to find?
M₂ = molarity of H₂SO₄ solution = 2.50M
V₂ = volume of H₂SO₄ solution = 50mL
On putting all these values on the above equation and calculate for the value of V₁ as:
V₁ = (2.50)(50) / (18) = 6.94mL
Hence correct option is (3) i.e. 6.94mL.
To know more about stock solutions, visit the below link:
https://brainly.com/question/3942978
Answer:
C. 6.94 mL
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
According to Avogadro's law, how will the number of molecules in 2 liters of hydrogen gas compare with the number of molecules in 2 liters of oxygen gas at the same temperature and pressure?
Answer:
Both will be the same
Do refer to the calculation above, hopefully it matches your answer.
Calculate the number of moles in 65.2 grams of Fe(OH)2
Answer:
89.86 g/mol
i hope it help:^
♡♡
This system has an equilibrium constant of 50. 5 at 448°C: H2(g) I2(g) ↔ 2HI(g). What is the reaction quotient, Q, for this system when [H2] = 0. 200 M, [I2] = 0. 100 M, and [HI] = 3. 00 M?.
Considering the definition of Q, the reaction quotient Q has a value of 450.
Definition of QThe reaction quotient Q is a measure of the relative amount of products and reactants present in a reaction at a given time when a reaction has not yet reached equilibrium.
For the reaction aA + bB ⇄ cC + dD, Q adopts the expression:
[tex]Q=\frac{[C]^{c}[D]^{d} }{[A]^{a} [B]^{b} }[/tex]
That is, Q is defined as the ratio between the equilibrium concentrations of products and reactants raised to their respective stoichiometric coefficients, at a given temperature.
Comparison between Q and KcComparing Q with Kc allows us to find out the state and evolution of the system:
If the reaction quotient equals the equilibrium constant, Q = Kc, the system has reached chemical equilibrium.If the reaction quotient is greater than the equilibrium constant, Q > Kc, the system is not in equilibrium. In this case the forward reaction predominates and there will be more product present than is obtained at equilibrium. Therefore, that product is used to favor the reverse reaction and reach equilibrium. Then the system will evolve to the left to increase the concentration of reactants.If the reaction quotient is less than the equilibrium constant, Q < Kc, the system is not in equilibrium. The concentration of the reactants is higher than it would be at equilibrium, so the forward reaction predominates. Thus, the system will evolve to the right to increase the concentration of products.Q for this systemIn this case the system is:
H₂(g) + I₂(g) ↔ 2 HI(g)
So, Q adopts the expression:
[tex]Q=\frac{[HI]^{2} }{[H_{2} ] [I_{2} ] }[/tex]
You know:
[H₂] = 0. 200 M[I₂] = 0. 100 M[HI] = 3. 00 MReplacing in the expression of Q:
[tex]Q=\frac{(3 M)^{2} }{(0.2 M) (0.1 M)}[/tex]
Solving:
[tex]Q=\frac{9 M^{2} }{0.02 M^{2} }[/tex]
Q= 450
Finally, the reaction quotient Q has a value of 450.
In this case, the reaction quotient is greater than the equilibrium constant, Q > Kc. Then, the system is not in equilibrium. The forward reaction predominates and the system will evolve to the left to increase the concentration of reactants.
Learn more about reaction quotient Q:
https://brainly.com/question/26610333
https://brainly.com/question/13466869
The speed of a cheetah running across the tundra is 27 m/s. The length of the tundra is 2,430 meters. How long did it take the cheetah to run across the tundra?
Answer:
90
Explanation:
because i ansered this before
A rigid container contains a mixture of 3 gases. The pressure of the gases are gas A is 445 mmHg, Gas
Bis 560 mmHg, and Gas C is 622 mmHg. What is the total pressure in the container?
Answer:
[tex]P_T = 1627\text{ mm Hg}[/tex]
Explanation:
Dalton's law of partial pressures states that the total pressure in a mixture of gases is the sum of the partial pressures of the individual gases.
In other word:
[tex]\displaystyle P_T = P_A + P_B + P_C[/tex]
Therefore, the total pressure of the mixture of three gases is:
[tex]\displaystyle \begin{aligned} P_T & = (445 \text{ mm Hg}) + (560\text{ mm Hg}) + (622\text{ mm Hg}) \\ \\ & = 1627 \text{ mm Hg}\end{aligned}[/tex]
In conclusion, the total pressure of the mixture is 1627 mm Hg.
A cheetah can run 1 meter in 0.0346812 seconds. How fast is a cheetah in mph?
If a cheetah can run 1 meter in 0.0346812 seconds, the cheetah can run 64.5mph.
How to calculate average speed?The average speed of a moving body can be calculated by dividing the distance moved by the body by the time taken. That is;
Average speed = Distance/Time
Average speed = 1m/0.0346812s
Average speed = 28.83m/s.
The average speed in m/s can be converted to mph as follows:
1 metre per second = 2.237 miles per hour
28.83m/s = 64.5mph
Therefore, if a cheetah can run 1 meter in 0.0346812 seconds, the cheetah can run 64.5mph.
Learn more about average speed at: https://brainly.com/question/12322912
Solid A and solid B were dissolved into two separate graduated cycliders
each containing 270 mL of water.
Solid A
Solid B
Which statment best describes the dissolving reaction of solid A and solid B
A. The dissolving reactions of both A and B were endothermic.
B. The dissolving reaction of both A and B were exothermic.
C. The dissolving reaction of A was exothermic and the dissolving of reaction B was
endothermic
D. The dissolving of reaction A was endothermic and the dissolving of reaction B was
exothermic
Answer:
C. The dissolving reaction of A was exothermic and the dissolving of reaction B was endothermic
Explanation:
Here is stuff to help you:
Hope this helps! Please let me know if you need more help, or if you think my answer is incorrect. Brainliest would be MUCH appreciated. Have a great day!
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A balloon containing 0.040 mol of a gas with a volume of 5.0 ml was expanded to 1.0 l. which equation should you use to find the amount of gas added? v subscript 2 equals startfraction v subscript 1 n subscript 2 over n subscript 1 endfraction. n subscript 2 equals startfraction v subscript 2 n subscript 1 over v subscript 1 endfraction. n subscript 2 equals startfraction v subscript 1 n subscript 1 over v subscript 2 endfraction.
P, R, and T are constant, then the volume is directly proportional to the mole. Then the correct option is A.
What is an ideal gas equation?An ideal gas is a theoretical composed of a set of randomly moving gas particles that interacts only through elastic collision.
Given
A balloon containing 0.040 mol of a gas with a volume of 5.0 mL was expanded to 1.0 L.
[tex]V_1=5\ ml[/tex]
[tex]V_2=1000\ ml[/tex]
[tex]n_1=0.040\ mole[/tex]
We know the equation of the ideal gas.
[tex]PV=nRT[/tex]
where P, R, and T are the constant, then
[tex]\dfrac{V_2}{V_1}=\dfrac{n_2}{n_1}[/tex]
[tex]V_2=n_2\times \dfrac{V_1}{n_1}[/tex]
Thus, the correct option is A.
More about the ideal gas equation link is given below.
brainly.com/question/1056445
Answer:
answer in picture
Explanation:
What features of this model will help Armando answer the question?
Answer:
The adjustable legs and the table of sand.
Note:The question is incomplete. The complete question is given below.
Using Models to Answer Questions About Systems
Armando’s class was looking at images of rivers formed by flowing water. Most of the rivers were wide and shallow, but one river was narrow and deep. Armando’s class thinks that this river is narrow and deep because:
the hill that the water flowed down was very steep, orthe sand grains that the water flowed through were very small.Armando designed the model below to try to answer the question: Why is this river so narrow and deep?
Explanation:
The model designed by Armando will be helpful to answer the question because of the following features it possesses:
1. An adjustable leg- since one of the hypotheses put forward by the class to explain why the river was narrow and deep was that the hill that the water flowed down was very steep, the adjustable legs can be lowered or raised in order to make the slope shallower or steeper so that their hypothesis can be tested.
2. A table of sand- the table of sand serves as the streambed. By adjusting the size of the sand grains to be larger or smaller, the students will be able to to test their second hypothesis that the small size sand grains that the water flowed through was the reason for the river to be narrow and deep.
The results of their experiments will enable them to come to a conclusion.
If Carlos was able to drive 81m/h after 3 hours, how far would he have traveled?
Answer:
243 miles in 3 hours
Explanation:
81 mph x 3 hours
243 miles in 3 hours
Which statement does not describe an independent variable? *............A......The responding variable........B.........The part that is changed by the scientist...........C.........The factor being manipulated..........D............The part of the experiment being tested
Answer:
The responding variable
Explanation:
The independent variable in a study refers to the factor that is being manipulated in an experiment.
As the independent variable is changed, its effect on the responding (dependent) variable is accessed.
The responding variable changes as the independent variable is manipulated, they do not mean the same thing.
Explain The difference in motion of Atom in the following states of matter solid liquid and gas which of the states has the slower moving atom and which one has the fastest
Answer:
the difference in the motion of molecules in an atom when its in the solid, liquid and gas state is that they move slower or faster dependant on which state they are in, solids having the slowest moving particles and gasses having the fastest moving particles
Find the volume of a rectangular prism that is
25 cm by 10 cm by 15 cm.
height
length
Answer:
3750 cm.
Explanation:
You multiply the three side measurements to find the volume.
25cm·10cm·15cm
375cm·10cm
3750 cm.
Hope this helps!
Answer:3750cm
Explanation: 25cm by 10cm is 250cm. Then 250cm by 15cm is 3750cm. To find volume, first you multiply length by width, then the answer of that you multiply by height.
What is one separation process that can be used to separate water from sand in a mixture?
Answer:
evaporation?
Explanation:
evaporate the water leaving behind the sand?
Which of the following trends is/are correct when you move
down the halogen group?
a Decreasing electronegativity
b Decreasing reactivity
C Increasing melting and boiling points
d All of the above
Answer: it’s d all of the above
Explanation:
How to separate a mixture of copper carbonate and iron sulfate
Answer:
Pure copper sulphate can be obtained from an impure sample by re-crystallization. The impure sample is dissolved in water, heated and then cooled which then later forms crystals. These copper sulphate crystals are then separated by filtration and drying.
What does it mean when a rock is foliated?
Answer:
(Foliated means the parallel arrangement of certain mineral grains that gives the rock a striped appearance.) Foliation forms when pressure squeezes the flat or elongate minerals within a rock so they become aligned.
Arrange Zn, Br, Fe, K, Na in order of increasing size
please help ASAP !!
Answer:
Na, K, Fe, Zn, Br,
Explanation:
look at periodic table. size increases left to right and from top to bottom.
what is the frequency of radio
Question
Answer
Explanation
Radio Frequency Is one of the electromagnetic frequency waves that lie in the range stretching from below 3 kilohertz to around 300 gigahertz and which includes the frequencies used for communication signals (such as for radio and television broadcasting and cellular telephone and satellite transmissions)
I hope this helps
Can somebody plz answer these 3 questions correct
(WILL MARK AS BRAINLIEST) promise :)
thankssss
Answer: Basilosaurus is a prehistoric whale which lived approximately 40 million to 34 million years ago during the Late Eocene Period.
Explanation:
Answer:
11. I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).
12. Basilosaurid, any member of the family Basilosauridae, an early group of whales that lived from the middle Eocene to the late Oligocene Epoch (about 41 million to 23 million years ago).
13. Protocetids had long snouts, large eyes, and their nasal opening was farther caudally than in earlier archaeocetes.
Hope this helps! :D
convert 4 hours into seconds (DA practice problems) must solve final answer.
1 & 2
Answer:
The answer is 14,400 seconds.
Explanation:
Hope it helps man ...
Answer:14400secondsExplanation:
Show work
1a. In a reaction between the elements aluminum and chlorine, aluminum chloride is produced. Write the balanced chemical equation.
1b.If 2.00 moles of Al react with Cl2 according to the above equation, how many grams of AlCl3 will form?
Answer:
Explanation:
Part A
2 Al + 3 Cl_2 ==> 2 AlC_3
Part B
The balanced equation tells you for every 2 mols of Al you will produce 2 mols of AlCl_3
Find the mass of 1 mol of AlCl_3
Mass Al = 27
Mass 3Cl = 3*35.5 = 106.5 Add
Mass 1 mol AlCl_3 = 133.5
Answer: 2 mols of AlCl_2 = 267.0 grams
Why is it important for us to show demonstrations and give evidence for our scientific claims?
Please help me this is due today!!!!
Answer:
Well first, a scientific claim is claims or statements after experimenting. Similar to other claims but they have evidence and data to support the claim.
So we would show demonstrations because we need support our scientific claim.