Which model is most similar to that of Aristarchus? The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn. The solar system shows the planets in their orbits around Earth in this order: Moon, Mercury, Venus, Sun, Mars, Jupiter, Saturn, Fixed stars. The solar system shows the sun and planets in their orbits around Earth in this order: Moon, Mercury, Venus, Sun, Mars, Jupiter, Saturn.
Answer:
It’s the first model
Explanation:
Answer:
The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth, with Moon, Mars, Jupiter, Saturn. First choice
Explanation:
Just had the question.
Round 1047.78 to three sig figs
105
100
1030
The number after rounded upto 3 significant figures is 1050.
We have a decimal number.
We have to round it up to 3 significant figures.
What are Significant Figures ?The term significant figures refers to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation.
According to the question, We have -
A = 1047.78
1047.78 (the original number has 6 significant figures)
The number after rounding up to three significant figures will be -
1050 (rounded to 3 significant figures)
Hence, the number after rounded upto 3 significant figures is 1050.
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Select True or False.
Social Security is normally paid out in the lump payment upon  retirement
Answer:
TRUE MY DOOD
Explanation:
A scientist conducted research and plotted his results in the histogram shown below. Which of the following is the best measure of the center of the data?
Median
Mode
Mean
They are all appropriate
Answer: Mean
Explanation:
The histogram in the given picture gives slightly bell shaped curve.
That means the data is symmetric and follows normal distribution.
Out of Mean, Median and mode , Mean is the best measure of the center of the data when data distribution is continuous and symmetrical.
We choose median if data has extreme values where as mode is considered as least measure of tendency and it used in nominal data.
Hence, the correct option is "Mean".
HELP ASAP! WILL GIVE BRAINLY!! Match each of the unknown ions to its appropriate description. 1.B+ 2.A− 3.D^2+ 4.C^2− a.A nonmetal that gained one electron b.A metal that lost one electron c.A nonmetal that gained two electrons d.A metal that lost two electrons
1B.a metal that lost one electron
4C a non metal that gained two electrons
what is 5800 in scientific notation?
Answer:
5.8 x 10³
Explanation:
What has more kinetic energy, the floor or a computer?
Answer:
Computer.
Explanation:
The computer is moving more than the floor, at least, it's moving when people are typing on it.
Hii, i’m having a bit of trouble on this and would appreciate help. thank you!
Answer:
Option A. 231 90Th
Explanation:
Please see attached photo for explanation
Which of the following is an oxidation-reduction reaction? KOH + HNO3 → H2O + KNO3 CaCl2 + Na2SO4 → CaSO4 + 2NaCl AgNO3 + NaCl → AgCl + NaNO3 Al2(SO4) 3 + 6KOH → 2Al(OH)3 + 3K2SO4 N2 + O2 → 2NO
Answer:
N2 + O2 → 2NO is an oxidation-reduction reaction.
Explanation:
An oxidation-reduction reaction (also know as Redox reaction) is a type of chemical reaction that involves a transfer of electrons between two species. It occurs when the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.
We will consider the equations one after the other.
KOH + HNO3 → H2O + KNO3Oxidation numbers of the individual element on the reactant side:
KOH : K = +1, O = -2, H = +1
HNO3 : H = +1, N = +5, O = -2
Oxidation numbers of the individual element on the product side:
H2O: H = +1, O = -2
KNO3: K = +1, N = +5, O = -2
There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.
CaCl2 + Na2SO4 → CaSO4 + 2NaClOxidation numbers of the individual element on the reactant side:
CaCl2 : Ca = +2, Cl = -1
Na2SO4: Na = +1, S = +6, O = -2
Oxidation numbers of the individual element on the product side:
CaSO4: Ca = +2, S = +6, O = -2
NaCl: Na = +1, Cl = -1
There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.
AgNO3 + NaCl → AgCl + NaNO3Oxidation numbers of the individual element on the reactant side:
AgNO3: Ag = +1, N = +5, O = -2
NaCl: Na = +1, Cl = -1
Oxidation numbers of the individual element on the product side:
AgCl: Ag = +1, Cl = -1
NaNO3: Na: +1, N = +5, O = -2
There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.
Al2(SO4) 3 + 6KOH → 2Al(OH)3 + 3K2SO4Oxidation numbers of the individual element on the reactant side:
Al2(SO4)3: Al =+3, S = +6, O = -2
KOH: K = +1, O = -2, H = +1
Oxidation numbers of the individual element on the product side:
Al(OH)3: Al =+3, O = -2, H = +1
K2SO4: K = +1, S = +6, O = -2
There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.
N2 + O2 → 2NOOxidation numbers of the individual element on the reactant side:
N2: N = 0
O2: O = 0
Oxidation numbers of the individual element on the product side:
NO: N = +2, O = -2
There are changes in the oxidation numbers, hence, it is an oxidation-reduction reaction.
The following is an oxidation-reduction reaction - N2 + O2 → 2NO
Oxidation numbers represent the potential charge of an atom in its ionic state. If the oxidation number decreases in a reaction, it is reduced. If an atom's oxidation number increases, it is oxidized.
CaCl2 + Na2SO4 → CaSO4 + 2NaCl is a double displacement reaction KOH + HNO3 → H2O + KNO3 is acid-base neutralization reaction AgNO3 + NaCl → AgCl + NaNO3 is double displacement reaction Al2(SO4) 3 + 6KOH → 2Al(OH)3 + 3K2SO4 is double displacement reactionAll three reaction mention above is not oxidation-reduction reaction as each atom has the same oxidation number in these reactions. N2 + O2 → 2NO is oxidation-reduction reaction.= > Oxidation state of N in the reactant is 0
=> Oxidation state of N in the product is +2
So, N is oxidized
=> Oxidation state of O in the reactant is 0
=> Oxidation state of O in the product is -2
So, O is reduced
Thus, the following is an oxidation-reduction reaction - N2 + O2 → 2NO
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Q1: What problem did the development of the metric system solve? Write your answer below!
Answer:
It solved the issue of depending on too many base units
Explanation:
It was first adopted by the French government. Metric system was developed by Gabriel Mouton of Lyons, he is called the founding father of the metric system. He proposed the decimal system of measurement that was refined by the scientists.
The metric system is simple for making measurements, you just need to know few metric units. There are seven base units in this system of measurement while there are twenty base units in inch-pound system of measurement. Metric system is easier to remember. The metric system follows the decimal number system and it decreases and increases in size by 10.
It has been adopted by all the countries of the world except Myanmar and US.
How can you determine a chemical property of a substance
Answer:When chemists study chemical substances, they examine two types of properties: chemical properties and physical properties. Some physical properties are extensive properties, properties that depend on the amount of matter present. Mass and volume are extensive properties.
Explanation:
Answer:
to observe the change in the color of the substance during a reaction
Explanation:
A rock occupies a volume of 20.0 cm3 and has a mass of 54 grams. What is its density?
Answer:
Density = 2.7 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]From the question
mass = 54 g
volume = 20 cm³
Substitute the values into the above formula and solve for the density
That's
[tex]Density = \frac{54}{20} [/tex]We have the final answer as
Density = 2.7 g/cm³Hope this helps you
Something about chemistry, is there such thing of mixing items to create medicine. If so what is it called? Medical chemistry?
Answer:
Drug compounding is often regarded as the process of combining, mixing, or altering ingredients to create a medication tailored to the needs of an individual patient.
A piece of metal ore weighs 9.00 g. When a student places it into a graduated cylinder containing water, the liquid level rises from 21.25 mL to 26.47 mL. What is the density of the ore
Answer:
1.72 g/ml
Explanation:
If our aim is to determine the density of the metal ore, then;
Mass of the metal ore= 9.00 g
Volume of the ore= volume of water displaced = 26.47 - 21.25 = 5.22 ml
Density of the ore= 9.00 g/5.22 mk
Density of the ore= 1.72 g/ml
Which part of Earth most likely has the highest albedo value?
Answer:
Sea ice
Explanation:
Sea ice has a much higher albedo compared to other Earth surfaces
Please answer asap!! how does the density of an object identify the material the object is made from?
Answer:
If you were to divide any object into small pieces of unit volume, the density would be the mass of each small piece. Everything is made up of molecules, which in turn are made up of atoms. So every object is created from the aggregation of atoms and molecules.
:)
How many meters are present in the 12.45 miles? Please show your work, and report your answer with the correct number of significant figures and appropriate units.
Explanation:
We know that,
1 mile = 1609.34 m
We need to find how many meters are present in the 12.45 miles. To find it use unitary method as follows :
12.45 mile = 1609.34 × 12.45
12.45 mile=20036.283 meters
or
[tex]12.45\ mile=2.0036\times 10^4\ m[/tex]
Hence, this is the required solution.
Which of the following numbers has three significant figures?
all of the choices
1000 yards
1014 miles
101 feet
Answer:
The correct answer is 101 feet.
Explanation:
To solve this problem, we need to remember the rules of significant figures. Any digit that is not zero is significant, and any zero is significant if it is between two non-zero digits or a trailing zero after the decimal point. Now, let's apply these rules to the options that are given:
1000 yards - Since the zeros are not after the decimal point or between two other digits, they are not significant. This means the only significant digit is 1, so there is only 1 significant digit.
1014 miles - All three of the non-zero digits are significant, and the 0 is significant in this case because it is between two other significant digits. Therefore, this number has 4 significant digits.
101 feet - The two 1's are significant because they are non-zero digits, and the zero is also significant because it is between the two 1's. Therefore, this number has 3 significant digits.
Thus, your answer is 101 feet.
Hope this helps!
Suppose an astronomer discovers a large, spherical-shaped body orbiting the Sun. The body is composed mostly of rock, and there are no other bodies sharing its orbit.
Answer:
The answer is "Comet".
Explanation:
The comets were interstellar frozen gas of snowballs, stone, and debris orbiting the sun, which are also the size of average towns while frozen. As even the orbit of the comet passes near the sun, it warms up and spreads dust and gas into a big floating head greater than most stars.
It is very important because they are primitive items left out from the galaxy creation. They were one of the first solid materials throughout the solar nebula, its collapsing interstellar-like cloud of dust and gas, which established the heat and planets.Answer: A Planet
Explanation:
The International Astronomical Union defines a planet as a spherical object that orbits a star. Planets clear the neighborhood around their orbits (i.e., no other bodies share their orbits).
a certain gas occupies 5 dm³ at 24 °C and 15 cm Hg. Calculate the pressure of the gas if the volume is halved and the temperature is raised to 200°C.
Explanation:
(P1V1)/T1=(P2V2)/T2
(15X5)/297=(p2x2.5)/473
p2=47.78cmHg
Return all unused chemicals to their original containers true or false
Answer:
no
Explanation:Unused chemicals are never returned to their original containers because you will be contaminating the chemical. Dispose of unused chemicals in the proper containers.
The Average Speed of the orbiting space shuttle is
17500 miles/hour. What is the speed in kilometers/
second?
Explanation:
It is given that, the Average Speed of the orbiting space shuttle is 17500 miles/hour.
We need to convert the speed in kilometers/ second
We know that,
1 mile = 1.609 km
or
1 km = 0.621 miles
1 hour = 3600 seconds
[tex]17500\ \dfrac{\text{miles}}{\text{hour}}=17500\ \dfrac{\text{miles}}{\text{h}}\times \dfrac{1\ h}{3600\ s}\\\\=17500\times \dfrac{\text{miles}}{3600\ s}[/tex]
Now cancel the miles in numerator.
[tex]17500\times \dfrac{\text{miles}}{3600\ s}=17500\times \dfrac{\text{miles}}{3600\ s}\times \dfrac{1.609\ km}{1\ \text{miles}}\\\\=17500\times \dfrac{1.609}{3600}\ km/s\\\\=7.82\ km/s[/tex]
So, 17500 miles/hour is equal to 7.82 km/s.
Separate a mixture of sand, common salt, copper pieces and iron fillings. Also measure the amount of common salt in the mixture. Write the steps and the procedure of separation. Also what safety measures you will take during the experiment.
Answer:
Explanation:
This question seeks to test the knowledge of separation techniques.
From the narration in the question, the first separation to be done is the removal of Iron fillings by the use of magnet (magnetic separation). Since Iron is magnetic, the iron fillings will be attracted by the magnet hence removing the iron fillings from the mixture.
The second constituent to be removed will be the copper pieces by the use of a sieve (sieving). Copper pieces have relatively larger sizes than sand and common salt, hence a sieve (which separates particles based on size) can be used to remove the copper pieces from the mixture.
What will be left in the mixture after the processes above will be salt and water. This mixture will have to be dissolved in water; the salt will dissolve in water while the sand will not. After which, filtration will be done to remove the sand which will be collected on the filter paper as filtride and the salt solution will pass through the filter paper as filtrate.
The salt solution can then be evaporated to dryness to retrieve the solid salt from the solution.
The amount of salt in the mixture can then be measured using a weighing balance.
Some of safety measures to be taken during the course of this experiment includes performing the experiment in an airtight and controlled environment. Lab coat and hand gloves should be worn during the course of the experiment. The evaporation to dryness should not be done close to an inflammable material/substance
I need help please, will mark you the brainliest.
Explanation:
The orbital diagram of an electron with eight electron is attached. Since the 2p orbitals are filled using the maximum space available instead of pairing the electrons, this is in accord with Hund's rule.
When filling orbitals, you should put one electron in each box. After all of the boxes in the orbital have one electron in each, you can then put the second electron into each of the boxes.
A participant took 5.2 hours to complete a marathon. How many minutes did the participant take to complete the marathon?
Answer:
312 minutes
Explanation:
because 1 hour = 60 minutes this is the example they give you so then you do the math from there
An ideal gas with γ = 1.67 has an initial temperature of 0°C, initial volume of 10.0 liters, and initial pressure of 1.00 atm. Then the gas is expanded adiabatically to a volume of 10.4 liters. What is the new temperature? (1 point)
Answer: T = 9.74°C
Explanation: An ideal gas in a quasi-static adiabatic process follows the equation: [tex]pV^{\gamma} = constant[/tex].
So:
[tex]1.10^{1.67} = constant[/tex]
constant = 46.7735
Adiabatic conditions can be written as:
[tex]TV^{\gamma-1}=constant[/tex]
Then, new temperature is
[tex]T.(10.4)^{1.67-1}=46.7735[/tex]
[tex]T.(10.4)^{0.67}=46.7735[/tex]
[tex]T = \frac{46.7735}{4.802}[/tex]
T = 9.74°C
The new temperature is 9.74°C.
Several scientists from different countries are asked to examine the results of an experiment before a journal will print it.
Which term best describes this step of the investigative process?
A)question
B)communication of results
C)peer review
D)experiment control
Answer:
C)peer review
Explanation:
Peer review involves the evaluation of scientific research work by other professionals working in the same field. It is one of the stages a manuscript passes through before it is published in any reputable journal.
Peer review is important because it ensures that only high quality and original scientific research is published for the consumption of other professionals in the same field.
2. The model on the right looks bumpy, but when you break a large salt crystal in two, the edges of the split often look straight and feel smooth. Is there a problem with the model?
Answer:
Maybe the sizes are too big which means that they need to be smaller because the more compact they are the more smooth and straight they will be because when they are too big it is easier to break them which would lead to a bumpy surface.
Explanation:
I don't know :)
he Solids model formed by atoms as solid spheres for macroscopic measurements, the model has no problems, because the atoms are extremely small
Dalton's atomic model was the first scientifically based model formulated in 1808, it consists of atoms with spheres that cannot be divided and solids are formed by contact between the spheres and chemical compounds are formed by joining atoms of two or more elements, this model is used to approximate solids such as solid spheres there are today.
The size of these spheres (atoms) is very small, nowadays it is known that it is of the order of 10⁻⁹ m, therefore, having a macroscopic crystal more than 10⁻⁶ m in length, it is impossible to measure fluctuations in the sizes of the spheres, since there are 10⁹ spheres in this volume, therefore it is not possible to measure the fluctuations with instruments,
To be able to measure this fluctuation, very small samples and very high resolution transmission microscopes are needed.
In conclusion, the model of the atom as solid spheres for macroscopic measurements, the model has no problems.
Learn more about solids here:
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what is the latin name for this plant
Answer:
plantae
Explanation:
if you look up the Latin it says plantae
Answer:
"Cactus", wich is a member of the plant family Cactaceae.
You have a container filled with 24 moles of neutral lithium. How much negative electric charge is contained in the electrons of all the lithium atoms in the container
Answer:
There are 6.94x10⁶ C of the negative electric charge contained in the electrons of all the lithium atoms in the container.
Explanation:
We have 3 moles of electrons (e⁻) in 1 mol of Li, so the quantity of negative electric charge is:
[tex] \frac{3 moles \thinspace e^{-}}{1 mol Li}*24 moles Li*\frac{6.022 \cdot 10^{23} e^{-}}{1 mol \thinspace e^{-}}*\frac{1.60 \cdot 10^{-19} C}{1 e^{-}} = 6.94 \cdot 10^{6} C [/tex]
Therefore, there are 6.94x10⁶ C of the negative electric charge contained in the electrons of all the lithium atoms in the container.
I hope it helps you!