Answer:
The volume in cubic centimeters is 250
Explanation:
The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other), the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:
a ⇒ b
c ⇒ x
So:
[tex]x=\frac{c*b}{a}[/tex]
The direct rule of three is the rule applied in this case where there is a change of units. To perform this conversion of units, you must first know that 1 mL = 1 cubic centimeters. So, if 1 cubic centimeters is 1 mL, how many cubic centimeters equals 250 mL?
[tex]cubic centimeters=\frac{250 mL*1 cubic centimeters }{1 mL}[/tex]
cubic centimeters= 250
The volume in cubic centimeters is 250
What particle inside the nucleus of an atom has a charge of +1?
Answer:
the proton
Explanation:
Inside an atom there are neutrons which have a neutral charge (no charge) and protons which have a positive charge. Outside an atom there are electrons those have a negative charge.
*
The state of matter with the highest energy and most movement is
Answer:
gas
Explanation:
Change 6.03x107 to standard notation
Answer:
The answer is 60300000
Explanation:
The standard notation is the counterpart of the scientific notation, while the scientific notation tries to make the number smaller by using exponential numbers with base 10, the standard notation leaves them as whole numbers or decimal numbers.
Example: 5x10∧3 is written in standard notation as 5000; Where 3 tells us the amount of 0 that follows the whole number.
2.05x10∧2 is = 205 in standard notation; Where the 2 tells us the number of times the comma is moved to the right.
A student has two samples of NaCl, each one from a different source. Assume that the only potential contaminant in each sample is KCl. The student runs an experiment to determine the percent by mass of chlorine in each sample. From the results of this experiment alone, which of the following questions is most likely to be answered? A. Which sample has the higher purity? B. Which sample has the higher density? C. What is the source of the contaminants present in each of the samples? D. Which sample came from a salt mine, and which sample came from the ocean?
Answer:
The correct option is;
A. Which sample has the higher purity
Explanation:
The information given relate to the presence of two samples of NaCl, from different sources
The only potential contaminant in each of the sources = KCl
The content of the sample = NaCl
The molar mass of NaCl = 58.44 g/mol
The molar mass of KCl = 74.5513 g/mol
Let the number of moles of KCl in the sample = X
For a given mass of NaCl, KCl mixture, we have;
The molar mass of potassium = 39.0983 g/mol
The molar mass of chlorine = 35.453 g/mol
The molar mass of sodium ≈ 23 g/mol
Therefore;
Each mole of KCl, will yield 35.453 g/mol per 74.5513 g/mol of KCl
While each mole of NaCl will yield 35.453 g/mol per 58.44 g/mol of NaCl
Therefore, the pure sodium chloride sample will yield more chlorine per unit mass of sample.
As such if the two samples have the same mass, the sample with the contaminant of KCl will yield less mass of chlorine per unit mass of the sample, from which the student will be able to tell the purity of the solution.
The sample with the higher purity will yield a higher mass chlorine per unit mass of the sample.
The question that will be most likely answered is ( A ) ; which sample has the higher purity
From the question there are two samples of NaCl from different sources that has a contaminant of KCl in each of them .
A student running an experiment to determine the percentage by mass of Chlorine in each sample is to determine which of the sample contains a lesser amount of the contaminant KCl.
Note : The purer the NaCl sample the more chlorine per unit mass of sample.
Hence the question that can be answered by this experiment is which sample has the higher purity.
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What must occur for a hypothesis to be considered fully proven?
A
Newspapers must report the event.
B
Public opinion must agree with the results.
C
Other scientists must repeat the experiment and get the same results.
D
There must be a specific number of controlled experiments.
1) 513.4 m to cm
Chemistry
UMMM.....I NEED YOUR HELP GUYS....I HAVE GOT A QUESTION FOR YOU.......... Water waves slow down and their wavelength shortens when they reach shallower water.........explain why this happens???????help me out!!
Answer:
Becausee deep - water waves do not interact with the ocean bottom as they travel , their speed is independent of the water depth . But as waves enter shallow water , interaction with the bottom alters the waves . Wave speed decreases , wavelength shortens and wave height increases .
Hope this helps :)
What are some examples of proton?
Answer: hydrogen atom Explanation: the nucleus of a hydrogen atom is an example of a proton, each atom of hydrogen has 1 proton.
Greg has 36 DVDs in his collection.
• 1/4 are drama.
• 1/9 are concerts.
• The remaining DVDs are comedies.
How many are drama and comedy?
Answer:
14
Explanation:
three blocks are shown here pls HELPPPP:
Which statement is correct?
Block A has the greatest density.
Block B has the greatest density.
The density of Block A is equal to the density of Block B.
The density of Block B is equal to the density of Block C.
The density of Block A is equal to the density of Block B, therefore statement (c) is correct .
What do you mean the term density ?Density is the ratio between mass and volume or mass per unit volume.
The SI unit of density is kilogram per cubic meter (kg/m3).
It is represented in the c g s unit of grams per cubic centimeter (g/cm3).
It is formulated by -:
Density=Mass/Volume
To calculate densities in each boxes -:
For Block A -
mass=2 kg
volume= l b h
volume=5×2×1
volume=10 cm³
Therefore,
density for block A=mass/volume
density for block A=0.2 g/cm³
For Block B-
mass=2 kg
volume= l b h
volume=10cm³
Therefore,
density for block B=mass/volume
density for block B=0.2 g/cm³
For Block C-
mass=3 kg
volume= l b h
volume=10cm³
Therefore,
density for block C=mass/volume
density for block C=0.3 g/cm³
Hence the density of Block A is equal to the density of Block B ,therefore option (c) is correct.
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Is wood a colloid or suspension ?
a rate of change is it velocity or acceleration .
Answer:
Acceleration is the correct answer. Hope this helps!
Explanation:
I need help please comrades, I will give 5 stars and mark you guys as the brainliest
Explanation:
Alkali metals have low melting points, low electronegativity, and low ionization energies. They are malleable and ductile. They are also good conductors of heat and energy.
Since they have one electron in their valence, alkali metals are very reactive. This means that they are not found alone in nature.
What physical properties help us identify and classify materials?
Answer:
Physical properties is that is value a state of the describes that physical system.
Explanation:
Physical property is that perform physical system can be used to the momentary and to referred the physical quantity.
Physical property is to contain that they are not model property and often to the extensive and intensive property they are process not combined.Physical property is to produced to the intensive property is not depend on size and the system or extensive property is to the show all the relationship.Physical property is to the direction and property to the spatial observations.Physical property is the interception to the reflective property to the surface of the light and its called secondary.Physical property is to the similar way in the atomic structure, property to the underline the atomic structure to the quantum structure.Physical property is to contain the object to used to the classical mechanics, to the optical and electrical property.Physical property is the many way to produced :- area, color, density, distribution, electric change, hardness , length, opacity, and strength.Hydrogen peroxide (H2O2, 34 g/mol) decomposes into water vapor and oxygen gas. How many liters of water vapor are produced from the decomposition of 17.0 g of H2O2 at STP?
Answer:
The volume of water vapor produced at STP is 11.60 L.
Explanation:
The decomposition reaction of H₂O₂ is:
2H₂O₂ → O₂ + 2H₂O (1)
We have:
m(H₂O₂): mass = 17.0 g
M(H₂O₂): molar mass = 34 g/mol
To find the volume of water vapor produced we need to find first the number of moles of H₂O₂ and H₂O:
[tex] n_{H_{2}O_{2}} = \frac{m}{M} = \frac{17.0 g}{34 g/mol} = 0.5 moles [/tex]
From the reaction (1) we have that 2 moles of H₂O₂ produce 2 moles of H₂O, so the number of moles of H₂O is:
[tex] 2n_{H_{2}O_{2}} = 2n_{H_{2}O} \rightarrow n_{H_{2}O} = 0.5 moles [/tex]
Now, we can find the volume of water vapor produced at STP, using Ideal gas law:
[tex] V = \frac{nRT}{P} = \frac{0.5 moles*0.085 L*atm/K*mol*273 K}{1 atm} = 11.60 L [/tex]
Therefore, the volume of water vapor produced at STP is 11.60 L.
I hope it helps you!
What are the postulates of Dalton's atomic theory?
Answer:
All matter consists of indivisible particles called atoms. Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements. Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms. Hope that helps : )
hello,
here is your answer:
**********
Postulates of Dalton's atomic theory:
⇒ All matter is made up of very tiny particles called atoms.
⇒ Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.
⇒ Atoms of a given element are identical in mass and chemical properties.
⇒ Atoms of different elements have different masses and chemical properties.
⇒ Atoms combine in the ratio of small whole numbers to form compounds.
⇒ The relative number and kinds of atoms are constant in a given compound.
⇒ Atoms of the same elements can combine in more than one ratio to form more than one compound.
**********
hope this helped,
:)
SEP Engage in Argument A classmate claims that state of matter is an extensive property because it can vary with temperature. For example, hydrogen changes into a liquid at very low temperatures and high pressure, while iron can melt into a liquid at very high temperatures. Do you agree with the classmate? Write an argument to support your position.
Answer: I agree with the student because in the question prior to this One question stated thatExtensive properties very with the amount of matter ina sample, so yes i agree.
Explanation:
In an electrochemical cell, electrons travel in which direction? * (a) from the anode to the cathode through the external circuit (b) from the anode to the cathode through the porous cup (c) from the cathode to the anode through the external circuit (d) from the cathode to the anode through the porous cup.
Answer:
(a) from the anode to the cathode through the external circuit
Explanation:
In an electrochemical cell, there are two half cells; the oxidation half cell and reduction half cell. Oxidation typically refers to loss of electrons and reduction refers to gain of electrons.
Electrons always flow from the anode to the cathode or from the oxidation half cell to the reduction half cell.
The electrical circuit in an electrochemical cell confirms the flow of electron. Usually a light bulb is attached. The correct option is;
(a) from the anode to the cathode through the external circuit
In an electrochemical cell, the direction which electrons travel is: (a) from the anode to the cathode through the external circuit.
Electrons can be defined as the subatomic particles of a chemical element that are negatively charged and have a magnitude of -1.
An electrochemical cell refers to a device that is capable of either generating electric current from the electrical energy released by a spontaneous redox reaction or using an electrical energy to cause chemical reactions.
Generally, an electrochemical cell is also referred to as a secondary cell and a good example is a rechargeable battery.
In Science, the direction of flow of current is usually from the anode (positive side) to the cathode (negative side) in an electrical circuit.
On a related, current is made up of electrons and as such the direction which electrons travel is usually from the anode to the cathode through the external electrical circuit.
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Explain the following observation: Wet clothing spread out on a clothes line dries more quickly than wet clothing left in a pile.
The reason wet clothes spread out dry faster than when left in a pile is because there is more surface area therefore the rate of evaporation increases and this decreases the time it takes for the water molecules to diffuse into the air.
Definition: The possible state for an electron of an atom that is proportional to its distance to the nucleus.
Answer:
"Energy Level" is the correct approach.
Explanation:
An electric charge electron density during an atomic seems to be the potential condition for this with the electron and therefore is proportional to its density from the nucleus. The ground state seems to be a particle, nucleus, and perhaps molecule with the corresponding energy level as well as its electrodes. The electron travels to something like a higher or excited energy state whenever there's an improvement in electricity, and has also been stimulated.1. Explain what is in a buffer. Discuss the function of a buffer. How will pH change when small amounts of acids or bases are added to the buffer solution? 2. Cooks use baking soda to make cakes light and fluffy. You might have used baking soda yourself. Baking soda is NaHCO3. A 0.1 M solution of baking soda in water has a [H+] of about 4.0 × 10–9. (You may prefer to think of the hydronium ion concentration, [H3O+], as 4.0 × 10–9.) Write the formula for the calculation of pH, and then show each step as you calculate the pH of a 0.1 M solution of baking soda. 3. Before tackling this problem, be sure you know how to find the antilog of a number using a scientific calculator. A solution has a pH of 5.4. Write the formula you will use to calculate the [H+] and then show all your work leading to the determination of [H+].
Answer:
(1) See below, (2) About 8.4 pH, (3) About 3.981 * 10⁻⁶ mol dm⁻³
Explanation:
1. A buffer is a solution that resist pH when adding a basic or acidic compound. It's purpose is to neutralize added acids and bases.
2. Remember that the formula for pH is -log [H+]. We have a 0.1 M solution of baking soda in water with [H+] of about 4.0 × 10⁻⁹. Therefore we can calculate the pH as follows...
pH = -log (4.0 × 10⁻⁹)
pH = -(-8.39794...) = (About) 8.4 pH of 0.1 M of baking soda
3. This question has a similar set up...
pH = -log [H+]
[H+] = inverse of log^- pH
[H+] = 10^-5.4 = (About) 3.981 [tex]*[/tex] 10⁻⁶
What do you understand by long form of periodic table? Explain some of its applications?
Answer:
Long Form of Periodic Table. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table.
Answer:
Long Form of Periodic Table. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table.
ANALYZE Explain why the liquid in a thermometer expands as temperature increases.
How is this related to the kinetic energy of the particles that make up the liquid?
The liquid expands as its temperature increases like stated. This is the same as saying that it occupies more space as temperature increases. Therefore it 'uses up' more of the space inside the thermometer as the temperature increases. the relation with kinetic energy is through the kinetic energy being used as it flows and expands, because of the heat, and mercurys relationship with heat. sorry if that's off :/
How does a forest fire model the energy flow of fuel combustion?
Answer:
Explanation:
Combustion can be defined as the burning of a compound in the presence of oxygen to produce carbon dioxide and water. Because it involves the release of heat (energy), it is referred to as an exothermic reaction.
Fuel is an organic compound and it's combustion will also go through the process above and also releases heat (exothermic reaction) into the atmosphere after burning. However, same can be said about forest fire also; as the forest is made up of plants (whose major constituents are organic also). The forest fire can also be termed as combustion because it burns in the presence of oxygen, releasing heat (energy) into the atmosphere (which also makes it an exothermic reaction).
A forest fire models the energy flow of fuel combustion by:
Reacting with oxygen to create heatCombustion is the chemical process whereby there is a redox reaction that causes burning and produces smoke in the form of gas.
For combustion to occur, the following processes must occur:
There must be the presence of an oxidantThere has to be a reaction between the oxidant and heat.The end product must be carbon dioxide and water.As a result of this, a forest fire models the energy flow of fuel combustion by making use of a reactant like wood to create combustion.
Because this process expels energy, then it is known as an exothermic reaction.
Therefore, forest fire occurs:
In the presence of:oxygenBy expelling heat By producing carbon dioxide and water.Read more here:
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What type of quantity is momentum
Answer:
Vector quantityExplanation:
Momentum is a vector quantity because it has both magnitude and direction
Students are conducting an experiment to determine if sugars are present in foods. They heat a test tube containing a sugar solution in a beaker of water. Which of these is an UNSAFE laboratory practice in this experiment?
a. heating the sugar solution in a closed test tube
b. rinsing hands with water after handling the materials
c. using a test tube clamp to hold the test tube
d. wearing safety goggles while heating the sugar solution
Answer:
A
Explanation:
Benedict's test is the ideal standard test to distinguished between reducing(glucose) and Non reducing(diasaccharides,sucrose).
Benedict's tests gives a positive test for the presence of reducing sugar,with the initial mixture of the sugar solution changing from the initials green and orange color and brick red precipate of copper (ii) ,which would not dissolve in solution.
However, with non reducing the Benedict's gives a negative test.Because no color change occurs.
In either case,the chemical reaction that occurs as the solution gained heat is exothermic and this may lead to boiling of the solution and spilling onto the burner,which may lead to explosion.
If the Earth is represented by a basketball placed mid-court, how far away should the object representing the Moon be placed?
Answer:
The moon should be at 543 cm.
Explanation:
If according to scientists the distance from the earth to the moon is approximately 384400 km
.
The earth has a radius of 6371 km.
A basketball has a radius of 9 cm. (Using a basketball of this radius as a reference)
With these data you can make a rule of 3:
The earth in centimeters has a radius of 6.371e+8 cm.
So: If the earth has a radius of 6.371e+8 cm and a distance to the moon of 384,400 km, what would the distance be if the earth had a radius of 9 cm?
6.371e+8 cm : 9 cm
384400 km : X
X = (384400 km * 9 cm) / 6.371e+8 cm
X = 5.43e-3 km converting to centimeters would give that:
X = 543 cm
The moon should be at 543 cm from Earth.
26,000 nanoliters = ? dekaliters
Show Calculation steps
Answer:
0.00026
Explanation:
it is in the picture
a study was done to find if different tire treads affect the breaking distance of a car what is the independent variable the dependent variable and the constant
Answer:
Independent variable: Different tyre treads
Dependent variable: Breaking distance
Constant: Same car
Explanation:
In an experiment, an independent variable is that variable which the experimenter controls or manipulates to effect an outcome. In this experiment, the tyre treads are changed to see if it would affect the breaking distance, hence, the DIFFERENT TYRE TREADS is the independent variable.
On the other hand, a dependent variable is the variable that responds to the manipulation of the independent variable. In other words, it is the outcome of the experiment. In this experiment, the BREAKING DISTANCE is the responding or dependent variable.
Constant or controlled variable is that variable that is kept constant or unchanged throughout the course of the experiment. The constant, if changed, will influence the result of the experiment. The constant in this experiment is the CAR since the same car (unchanged) was used for the experiment.
3. How many atoms are found in 5.20 g of magnesium (Mg)?
Explanation:
In order to go from mass of magnesium to atoms of magnesium, we have to do two things:
Convert mass of Mg to moles of Mg using the molar mass of Mg as a conversion factor
Convert moles of Mg to atoms of Mg using Avogadro's number (6.02×1023) as a conversion factor
Step 1:
Before we start, I should note that the molar mass of Mg is 24.31gmol. We can go from mass to moles using dimensional analysis. The key to dimensional analysis is understanding that the units that you don't need any more cancel out, leaving the units that are desired:
48.60g
×1mol24.31g
=2.00mol
Step 2:
We'll use this relationship:
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Using the moles of Mg that we just obtained, we can use Avogrado's number to perform dimensional analysis in order to cancel out units of mol to end up with atoms of Mg:
2.00mol
×6.02×1023atoms1mol
=1.204×1024atoms
Thus, 48.60g of Mg is equivalent to 1.204×1024atoms
Hope this helped :)