Answer:
[tex]6.378*10^{6}m[/tex]
Explanation:
we have zeroes so that can be
[tex]6378*10^{3} m[/tex]
and we can continue moving the decimal point three more times
[tex]6.378*10^{6}m[/tex]
A neutral atom has an equal number of positive and negative charges. If a neutral fluorine atom has 9 protons and 10 neutrons, how many electrons will it have?
Answer:
9 electrons.
Explanation:
Number of electrons = number of protons
= 9.
Red dye can be made from a mixture of yellow dye and magenta (a deep purplish red) dye. How could you determine if a particular red dye is made from a single dye or from a mixture of yellow and magenta dyes?
Answer:
When preforming the experiment the red dye will separate if it had other dyes included in it
Explanation:
Paper chromatography is a good way of separating coloured substances mixed together in a solution. During chromatography, the solvent soaks up the paper past the spot of the mixture and the different substances move upwards too. They move different distances depending on what kind of substance they are, what the solvent is and how far the solvent itself travels.
A student wants to see how temperature affects the
production of gases when yeast and water are mixed. She
mixes them at different temperatures in clean soda
bottles. She then places a balloon over the top of each
bottle.
Which statement best describes the use of the balloons in this experiment?
Answer:
To monitor Pressure increase
Explanation:
the more pressure, the higher the production of the gas, which can be recorded, more pressure meaning higher production. Then vary the temperature.
Answer: Logical, Because it allows the student to catch any invisible gases given off. I hope this helps
Explanation:
Calculate the cell potential, Ecell, of a concentration cell containing a 0.1 M solution of Zn2 and a 1.0 M solution of Zn2
Answer:
The cell potential is 0.0296V
Explanation:
Please see the attachment below
Which part of an atom is mostly empty space? nucleus proton cloud electron cloud neutron
Answer:
its C
Explanation:
Cloud electron is a part of an atom is mostly empty space. Hence option D is correct.
What is atom?It is the smallest unit of matter that possess the properties of the chemical element. It can’t be an independently, they form ions and molecules they both are combine and form large numbers of matters.
Every solid, liquid, gas, and plasma are composed of neutral or ionized atoms.
Atoms are basically three types: Neutrons, protons and electrons. In atoms there are two regions:
The nucleus (with protons and neutrons)Positive chargeElectron clouds: Most of the volume of an atom.
The region where the electrons can be found (mostly empty space). Cloud electron is a part of an atom is mostly empty space. Hence option D is correct.
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Is one unlit match an example of a physical or chemical change, or a physical or chemical property?
I believe it’s physical property because there is no chemical reaction to an unlit match♀️
at 100c the vapour pressure of a solution of 6.5g of solute in 100g of water is 732mm if kb is 0.52 k/m the boiling point of solution will be
Answer:101.105⁰c
Explanation:
Is the following statement a fact,, opinion, or theory? Why?
Scrambled eggs are better for breakfast than cereal. I can stay full longer if I eat eggs.
Answer:
i think opinion cause you could be saying in my opinion, scrambled eggs are better for breakfast than cereal.
PLEASE HELP
You have four water samples at different temperatures. In which sample are the molecules vibrating at the fastest speed?
O A. water at 37°C
O
B. water at 99°C
C. water at 99°F
OD. water at 299K
A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: The label on the graduated cylinder says: empty weight: She put some solid sodium hydroxide into the graduated cylinder and weighed it. With the sodium hydroxide added, the cylinder weighed . She added water to the graduated cylinder and dissolved the sodium hydroxide completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was . What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits.
Answer:
1.099 gmL¯¹ ≈ 1.1 gmL¯¹
Explanation:
From the question given above, the following were obtained:
Mass of empty cylinder = 9.5 g
Mass Cylinder + NaOH = 31.92 g
Volume of solution = 20.4 mL
Concentration of solution =?
Next, we shall determine the mass of sodium hydroxide, NaOH. This can be obtained as as illustrated below:
Mass of empty cylinder = 9.5 g
Mass Cylinder + NaOH = 31.92 g
Mass of NaOH =?
Mass of NaOH = (Mass Cylinder + NaOH) – (Mass of empty cylinder)
Mass of NaOH = 31.92 – 9.5
Mass of NaOH = 22.42 g
Finally, we shall determine concentration of the solution as follow:
Mass of NaOH = 22.42 g
Volume of solution = 20.4 mL
Concentration of solution =?
Concentration = mass /volume
Concentration of solution = 22.42 / 20.4
Concentration of solution = 1.099 gmL¯¹ ≈ 1.1 gmL¯¹
Therefore, the concentration of the solution is 1.1 gmL¯¹
In a survey that asked about alcohol use in high school students, which of
these is an important measure for controlling bias?
A. Developing a program to combat alcohol use
B. Getting a random sample from all grade levels
C. Asking the high school seniors
D. Asking students if they would like to participate
SEMA
Answer: B
Explanation: to have a control, and many samples to investigate and cover the differences and anseretics.
In a survey that asked about alcohol use in high school students , the important measure for controlling bias is "Getting a random sample from all grade levels".
What is alcohol?A chemical compound is found in alcoholic beverages like beer, wine, as well as liquor. Several medicines, mouthwashes, home items, as well as essential oils contain it.
In a survey that asked about alcohol use in high school students , the important measure for controlling bias is "Getting a random sample from all grade levels".
Therefore, the correct answer will be option (B).
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A sample of iron shot is added to a graduated cylinder containing 47.5 mL of water. The water level rises to the 51.1 mL mark. The density of iron is 7.87 g/mL. From this information, calculate the mass of the sample. *
Answer:
The mass of iron shot is 28.3 grams.
Explanation:
Given that the initial volume of water is 47.5 mL and final volume of water containing iron shot is 51.1mL. First, you have to find the volume of iron shot by subtracting :
[tex]47.5 + iron \: shot = 51.1[/tex]
[tex]iron \: shot = 51.1 - 47.5[/tex]
[tex]iron \: shot = 3.6ml[/tex]
Next, we have to apply density formula, D = mass/volume :
[tex]d = \frac{m}{v} [/tex]
[tex]let \: d = 7.87,v = 3.6[/tex]
[tex]7.87 = \frac{m}{3.6} [/tex]
[tex]m = 7.87 \times 3.6[/tex]
[tex]m = 28.3g \: (3sf)[/tex]
Which of the following are common behaviors of scientists? a.doing background research b. testing ideas with experiments c. analyzing data from tests d. reporting results to others e. all of the above
Answer:
Explanation: It is B. all above
Consider the development of atomic theory. The last piece of the atomic puzzle was the discovery of
A)
electrons in orbitals.
B)
the neutron in the nucleus.
C)
a dense, centrally located nucleus.
D)
the location of the electron cannot be determined.
Answer:
The answer will be B
Explanation:
Answer:
B.the neutron in the nucleus
Explanation:
PLZ HELP!! ILL MARK BRAINLIEST!! What claim do ghost hunters make about energy-detecting devices? They can determine how many spirits are in one location. They can produce sounds that may be confused with ghosts. They can sense the presence of spiritual energy. They can distinguish good spirits from evil spirits.
Answer:
[See Below]
Explanation:
I mean they say all those things , but if it has to do with just the device I'm guessing it'd most likely be They can sense the presence of spiritual energy since they claim it's the device they are using to tell them if there is something there they can't see.
Answer:
The Awnser is C (pls give me brainliest if this awnser is correct)
Explanation:
Write the number in scientific nation form
Answer:
its already in scientific notation form however its ordinary or real form is -0.005682
Explanation:
scientific notation
when a number is expressed with some power of 10 multiplied by a number between 1 to 10 is called scientific notation
HELP!! ILL MARK BRAINLIEST!! Why do shows about ghosts often feature mostly nighttime scenes? This is the only time of day ghosts are present. This time of day produces more dramatic footage. This is the time of day when it is easiest to see ghosts. This is the only time spiritual energy can be measured.
We sense "ghosts" that aren't there because of our heightened state of anxiety, our incapacity to discern nighttime stimuli effectively, our belief that bad entities should favor the dark, and our relative lack of nighttime experience.
The correct option is (B) This time of day produces more dramatic footage.
In ghost stories, ghosts frequently manifest at night for a variety of reasons:
Because our inclination to fear the dark is inherent. In the daytime, we can see nearby predators; at night, we cannot. We are more exposed.Because it's difficult for humans to see in the dark, it's simpler to imagine things that aren't actually there. Our brain is capable of putting together several pieces of data to construct an experience that didn't actually take place. For instance, at darkness, we can hear things but not see them.Because nightfall is nasty and dangerous, it makes sense that wicked things would emerge at this time of day. It seems sense that spirits would prefer the night over the day, at least on the surface.We have a lot of experience not seeing ghosts during the day and far less experience seeing ghosts at night. That instance, if someone were to say, "X tends to happen around 4pm," you would respond, "no, it doesn't," but if they said, "X tends to happen at 4am," you may be a little unsure. There are moments of the night when you aren't awake all that often.Learn more about the Anxiety with the help of the given link:
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How many bonds does argon group viii form
A. 0
B. 3
Answer:
option A is correct
Explanation:
argon belongs to noble gas which doesnt form any type of chemical bond
The number of bonds that will argon group will form is zero, as it already have octet configuration.
What is noble gas?Nobles gases are the most stable gases present in the periodic table and electronic configuration of valence shell of these gases are always complete or stable i.e. 2 or 8.
Argon is a noble gas, whose atomic number is 18 and valence shell has 8 electrons. As we know that atoms will take participate in bond fomation to get the stable state and fulfilled valency, so argon will not form any bond as it is already in stable state.
Hence argon will form zero bonds.
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10. This is a neutral atom. What is this element
Answer:
I guess carbon
Explanation:
what is Ionization Energy?
Answer:
Ionization energy is a measure of the difficulty involved in removing an electron from an atom or ion or the tendency of an atom or ion to surrender an electron.
Explanation:
Answer:
This is the energy required to remove a valence electron from an atom of the element to form an ion.Generally,there is a tendency for ionization energies to increase across a period and decrease down a group....
Currents shape rivers over long periods of time.
Please select the best answer from the choices provided
True
False
Answer:
True
Explanation:
Most rivers begins life as a tiny stream running down a mountain slope..... small streams meet and join together, growing larger and larger until the flow can be called river. On its way down, the water shapes the landscape by wearing away rocks and carving out a network of valley.
a. 165 lbs = ?? g
b. 12.01 cm = ?? m
Answer:
a) 74842.7 g
b) 0.1201 m
Explanation:
1 pound is 453.592 g
165 pound = 74842.7 g
12.01 / 100 = 0.1201 m
What is the formula for 2-methylnonane
Answer:
C10H22
sorry if im wrong
Sulphur dioxide and oxygen reacts to form sulphur trioxide. The equilibrium mixture contain 5.0 × 10−2 M SO3, 3.0 × 10−3 M SO2 and 3.5 × 10−3 M O2. Calculate equilibrium constant for reaction?
Answer:
Keq = 79365
Explanation:
Based on the reaction of sulphur dioxide, SO2, with O2, to produce SO3:
2SO2 + O2 ⇄ 2SO3
The equilibrium constant of reaction (Defined as the ratio of concentrations of products over reactants powered to the coefficient of each reactant). For the reaction:
Keq = [SO3]² / [SO2]² [O2]
Replacing with concentrations of the problem:
Keq = [5.0x10⁻²]² / [3.0x10⁻³]² [3.5x10⁻³]
Keq = 79365A stream flows at a rate of 10.4 liters per hour. Convert this rate to cubic meters per day.
Answer:0.2496m³/day
Explanation:
The sodium atom loses an electron to form a sodium Ion (Na+). Which statement is correct with respect to its atomic radius?
O A. The sodium ion has a larger radius than the atom.
OB.
The sodium lon has a smaller radius than the atom.
OC.
The sodium ion and the sodium atom radil are the same size.
OD
The sodium ion has twice the radius of the sodium atom.
Answer:
sodium ion has smaller radius than a atom.
Explanation:
HELP!!! What two volume units have the same value?
Answer:
1milliliter=1cubic centimeter
Answer:
volume and density I'm pretty sure
A shiny chunk of metal is found to have a mass of 37.28g. The metal is dropped into a graduated cylinder which contains 20.0 mL of water. The volume of the cylinder rises to 34.0 mL. Determine the density of the metal. What might the metal be made of?
Answer: The density of the material is 2.66 g/mL and it is likely this is made of Aluminum
Explanation:
The first step to know the material of the chunk of metal is to calculate its density. The general formula for density is P (density) = [tex]\frac{m (mass)}{ v (volume)}[/tex]. Moreover, in this case, it is known the mass is 37.28 g, but the volume is not directly provided. However, we know the water in the graduated cylinder had a volume of 20.0 mL and this increased to 34.0 mL when the chunk of metal is added, this means the volume of the metal is 14 mL (34.0 mL - 20.0 mL = 14 mL). Now let's calculate the density:
[tex]P =[/tex] [tex]\frac{37.28g}{14.0mL}[/tex]
[tex]P = 2.66 g/mL[/tex]
This means the density of this metal is 2.66 g/mL, which can be rounded as 2. 7 g/mL, and according to the chart, this is the density of aluminum. Therefore, this material of this chunk is aluminum.
Which of the following is a compound?
Select the correct answer below:
Water
Sodium
Chlorine
Oxygen
water
explanation:
water consists one oxygen atoms and two hidrogen of atom.
compound: have two or more atom
Hope this helps :)
HIFT|d/c/ 113 r 12
a b/c 9.416666667
ard Deviation SD (MODE 2
Data: 20X5, 30X4, 40, 10X6
ALPHA SC SC1
20 ALPHA 5 DATA 3
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SHIFT
3 a b/d 40
9r5r 12
10 aim
160 mt at
and
helium
5. sample 07
25 degree
occupies
volume
volume of
it occupy 17
the
IS
will
dear
pressure
degree celsius. What
eased
to
8 atm
at
constant
temperature?
Answer:
hey guys are doing. . I have been in business for a new job and I will be a great time , and I will be a good timeExplanation:
for me, but the best. . the first one. . the first one