Sand + water = Sand Sand solution
Answers
Answer:
When sand is added to water, it does not mix, and no solution is formed.
Explanation:
Sand is insoluble...
Related Questions
Examples of chemical changes in nature
A weak acid, HA, has a pKapKa of 4.3574.357 . If a solution of this acid has a pH of 4.0054.005 , what percentage of the acid is not ionized? Assume all H+H+ in the solution came from the ionization of HA.
Backpackers often use canisters of white gas to fuel a cooking stove's burner. If one canister contains 1.45 L of white gas, and the density of the gas is 0.710 g/cm3, how many kilograms of fuel are contained in one canister?
Simple chem question - please help!Given the equation: N2 +2O2 → 2NO2, what mass of oxygen is required to react completely with 7g of nitrogen? A) 8 g B) 16 g C) 32 g D) 64 g
Answers
is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level.
What are Energy Levels?
The electrons that surround an atom around the nucleus are located in regions called "energy levels". It represents the 3-D space that surrounds the nucleus where the electrons are present. It is divided into several energy levels such as first energy level, second energy level and so on.
The level that is closest to the nucleus is the first energy level, then the second one is further away from it, then the third one is a little further away and so on. Each energy level has different number of electrons like first has 2 electrons, second has 8, third has 8 and so on. The electrons which are further away from the nucleus are called valence electrons.
For given above information,
E = - /
where,
= 13.6 eV (1 eV = 1.602×10-19 Joules) and n = 1,2,3… and so on so that the ground state has energy
= -13.6 eV and the second energy level (the first excited state) has energy
= -13.6/4 eV = -3.4 eV.
So,
1eV = 1.602×J
Energy difference can be calculated by -13.6eV (-
)
= Final energy;
= Initial energy
1.88 eV is equals to x
So, x= 3.03*
Thus, is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level.
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Answers
Answer:
Explanation:
No sure I tried
Final answer:
A propane molecule's structure can be understood through the ball-and-stick model where carbon and hydrogen atoms play distinct roles leading to different alkyl groups.
Explanation:
The ball-and-stick model of a propane molecule is built using black spheres to indicate carbon atoms and white spheres for hydrogen atoms. In propane, each of the six equivalent white spheres (hydrogen atoms) are bonded to a black sphere (carbon atom) connected to one other black sphere (carbon atom). The remaining two hydrogen atoms are of a different type as they are bonded to a carbon atom (black sphere) that is bonded to two other carbon atoms. They are represented as purple spheres in this explanation. Adjacently, in 2-methylpropane, we find nine similar hydrogen atoms, but notably, one that differs - represented as a green sphere which is bonded to a carbon atom connected to three other carbon atoms. This unique arrangement allows for the formation of different alkyl groups when certain hydrogen atoms are removed.
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Answers
Answer:
behavioral observation scale
Explanation:
According to my research on different methods for providing feedback, I can say that based on the information provided within the question Joseph should use a behavioral observation scale. This feedback method measures the level of performance and frequency of certain behaviors. In this situation this feedback method would be the easiest and most accurate method of providing feedback.
**Even though no answer choices were provided this method is the most used in these types of situations.**
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.
Answers
after a volcanic eruption is the answer
Mudflows of volcanic eruptions are the most dangerous, and are called lahars
Answers
Answer:
38.8 g
Explanation:
Density is just mass divided by volume, so if you know 2 of those 3 things you can solve for the other one.
Let's write it as: D = m/v
We know D, and we know v, so solve for m:
m = Dv
Now just plug in the the known values:
m = (0.98 g/ml)( 39.63 ml) = 38.8 g
(Notice how ml cancelled out, leaving grams, which is what we wanted for mass.)
Answers
The correct scientific notation form of the number 5,489.6654 using only 2 significant figures is: 5.5 * 10³
What is scientific notation
Scientific notation is a way to represent very large or very small numbers in a more concise and manageable format. It consists of two parts: a coefficient and an exponent of 10.
In your given number, 5,489.6654, we want to express it in scientific notation using only 2 significant figures. Significant figures are the digits in a number that contribute to its precision.
Identify the significant figures: From the given number, we have two significant figures, which are 5 and 4.
Determine the coefficient: To represent the number in scientific notation, we want the coefficient to be between 1 and 10. In this case, we can round the number to 5.5 (rounding the 8 up).
Determine the exponent of 10: To express the number 5.5 in scientific notation, we need to move the decimal point in the original number to the right by one place.
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Answer:
5.4 × 10^3.
Explanation:
Not 5.49 × 10^3, 5.4 × 10^7, or 5.5 × 10^3.