Answer:
Explanation:
an atom is a neutral particle because it contain equal number of positive and negatively charge particle
Answer:
because it consists of the equal number of protons
Air is a natural resource .
Ture
False
21.7 mol Rn =
Rn atoms
You have convert please help❤️
Answer:
130.68 × 10²³ atoms
Explanation:
Given data:
Number of moles of Rn = 21.7 mol
Number of atoms = ?
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
21.7 mol × 6.022 × 10²³ atoms / 1mol
130.68 × 10²³ atoms
Ight I just here’s my first one
Answer:
D
Explanation:
what element is
Column 16, period 3
Answer:
The element is Sulfur.
Explanation:
How many neutrons does Ruthenium have?
Answer: 57 neutrons
Explanation: Ruthenium has an atomic number of 44, meaning it has 44 electrons, 44 protons, and 57 neutrons.
Answer:
57 neutrons
Explanation:
Ruthenium has atomic number of 44, that is, it contains 44 electrons distributed in atomic orbitals and its nucleus has 44 protons and 57 neutrons (Figure 1). Electron distribution in atomic or molecular orbitals is called electron configuration which for Ru and the other group 8 chemical elements is shown in Table 1.
true of false. A d-orbital lies in the x, y, and z area defined by the geometric axis of space.
Answer:
true
Explanation:
The average monthly temperatures for January, April, July, and October in Baltimore, Maryland are graphed below. These averages were calculated from 30 years of data.
Nina predicts that the average temperature in Baltimore will be 68°F next April. Why is her prediction probably wrong?
A.
because the average July temperature is greater than 75°F
B.
because 68°F is much lower than the average April temperature
C.
because 53°F is much lower than the average April temperature
D.
because 68°F is much higher than the average April temperature
Answer:the answer is d
Explanation:because the graph shows that that the average temperature is 53 so it only makes sense that the answer is (D)
When 38.1 grams of a certain metal at a temperature of 90.0°C is added to 100.0mL of water at a temperature of 17.6°C in a perfectly insulated calorimeter, the final temperature of the resulting mixture is 19.1°C. a. Find the value of q for the metal b. Find the value of q for the water c. What is the specific heat of the metal?
Answer:
a. qm = 627.3 J
b. qw = 627.3 J
c. C₂ = 227.4 J/kg.°C
Explanation:
a.
Since, the calorimeter is completely insulated. Therefore,
Heat Lost by Metal = Heat Gained by water
qm = qw
qm = m₁C₁ΔT₁
where,
qm = heat lost by metal = ?
m₁ = mass of water = (density)(volume) = (1000 kg/m³)(100 mL)(10⁻⁶ m³/1 mL)
m₁ = 0.1 kg
C₁ = specific heat capacity of water = 4182 J/kg.°C
ΔT₁ = Change in Temperature of Water = 19.1°C - 17.6°C = 1.5°C
Therefore,
qm = (0.1 kg)(4182 J/kg.°C)(1.5°C)
qm = 627.3 J
b.
Since,
qm = qw
qw = 627.3 J
c.
qm = m₂C₂ΔT₂
where,
m₂ = mass of metal = 38.1 g = 0.0381 kg
C₂ = specific heat capacity of metal = ?
ΔT₂ = Change in Temperature of metal = 90°C - 17.6°C = 72.4°C
Therefore,
627.3 J = (0.0381 kg)(C₂)(72.4°C)
(627.3 J)/(0.0381 kg)(72.4°C) = C₂
C₂ = 227.4 J/kg.°C
Sound _____.
travels in transverse waves
requires a medium to travel through
travels most slowly through solids
speeds up when temperature is increased
is changed into electrical impulses by the cochlea
Answer:
Sounds travels in transverse waves requires a medium to travel through
Answer:
The answer is A
Explanation:
just got it correct on a quiz
Please answer quick. In an experiment, a student collects 107 mL of H2 over water at a pressure of 104.8 kPa and a temperature of 30°C. How many grams of H2 are present?
A.
0.024 g
B.
4.00 g
C.
0.04 g
D.
0 049 g
And explain
Answer:
Mass = 0.008 g
Explanation:
Given data:
Volume of H₂ = 107 mL
Pressure = 104.8 KPa
Temperature = 30°C
Mass of H₂ present = ?
Solution:
Formula:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the units of temperature, pressure and volume.
Temperature = 30+273 = 303 K
Volume of H₂ = 107 mL (107/1000= 0.107 L)
Pressure = 104.8 KPa (104.8/101 = 1.04 atm)
by putting values,
1.04 atm ×0.107 L = n× 0.0821 atm.L/ mol.K × 303 K
0.11 atm.L = n×24.87 atm.L/ mol
n = 0.11 atm.L / 24.87 atm.L/ mol
n = 0.004
Mass of H₂:
Mass = number of moles × molar mass
Mass = 0.004 mol × 2 g/mol
Mass = 0.008 g
What can be represented on paper or computer by using the Lewis Dot structure?
A. the electrons orbital
B. the position of an element in the periodic table
C. the valence electron shells of atoms
D. the number of total electrons
Answer:
option C is correct
Explanation:
If an atom gains one electron, what charge will it have?
Answer:
It becomes negatively charged
Proton is positive, electron is negative and neutron is neutral
Explanation:
Answer:
If an atom gains one electron, it will have a negative one charge, or -1.
Electrons = Negative
Protons = Positive
formula for salt
I will mark u brain list
Answer:
The formula for salt is NaCl or Sodium chloride
PLS HURRYY ILL NAME YOU BRAINLIESTTT
explain the difference between a compound and a mixture
Answer:Compound: A substance that is made up of more than one type of atom bonded together. Mixture: A combination of two or more elements or compounds that have not reacted to bond together; each part in the mixture retains its own properties. Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances. Compounds can be of three types, which are: covalent compounds, metallic compounds and ionic compounds.
How do the scientist know that cells exist
Write an explanation on how filtration works, using the words: soluble and unsoluble.
Answer:
If a substance does not dissolve in a solvent, we say that it is insoluble. For example, sand does not dissolve in water – it is insoluble.
Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered:
the sand stays behind in the filter paper (it becomes the residue)
the water passes through the filter paper (it becomes the filtrate)
The slideshow shows how filtration works
Explanation:
1st
A beaker containing a mixture of insoluble solid and liquid. There is filter paper in a filter funnel above another beaker.
2nd
The mixture of insoluble solid and liquid is poured into the filter funnel.
3rd
The liquid particles are small enough to pass through the filter paper as a filtrate. The solid particles are too large to pass through the filter paper and stay behind as a residue.
Answer:
Filtration is the action or process of filtering something. Filtration is the method used for separating an insoluble solid from a liquid. Ex - oil and water
I am really sorry but I don't know how to include the word solube!!!
Help please I'll give u brainliest
What is the balanced equation that represents this reaction. sulphur trioxide reacts with water vapour in the atmosphere to form sulphuric acid (h2so4).
so3 +h2o =h2so4
i just searched up google i have no explanation
what type of mixture is table salt
Answer:
The chemical mixture of table salt is NaCl.
What is the frequency of a photon whose energy is 5.4 ´ 10-19 J? (h = 6.626 ´ 10-34 J·s)
Answer:
8.15 x 10¹⁴Hz
Explanation:
Given parameters:
Energy of photon = 5.4 x 10⁻¹⁹J
h = 6.626 x 10⁻³⁴J.s
Unknown:
Frequency of the photon = ?
Solution:
The energy of a photon is given as;
E = hf
h is the Planck's constant
f is the frequency
f = [tex]\frac{E}{h}[/tex] = [tex]\frac{5.4 x 10^{-19} }{6.626 x 10^{-34} }[/tex] = 8.15 x 10¹⁴Hz
A given sample of metal has a density of 2.5 g/cm3 and a mass of 12.5 g. What is the
volume of the metal?
31.25 cm^3
5.0 cm^3
0.20 cm^3
5.0 cm
Answer:
5.0 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question we have
[tex]volume = \frac{12.5}{2.5} \\ [/tex]
We have the final answer as
5 cm³Hope this helps you
The____of an earthquake is the location where the rupture of an
earthquake begins and energy is released.
(I’m really slow I need help) for science
Answer:
try hypocenter for the blank spot... hope this helps
Explanation:
Does recycling plastic solve the issue of using crude oil?
Answer:
Every single tonne of recycled plastic cuts carbon emissions by 1.6t and preserves 2t of crude oil. And each tonne that is recycled is not just one tonne less which the industry has to buy as crude oil on the global market – it is also one tonne less of waste plastic in our seas and oceans.
which molecules are used to produce energy
Answer:
Explanation:
fats, proteins, and carbohydrates
What causes the greenhouse effect?
Answer:
hope it helps...
Explanation:
The greenhouse effect is caused by the atmospheric accumulation of gases such as carbon dioxide and methane, which contain some of the heat emitted from Earth's surface. The atmosphere allows most of the visible light from the Sun to pass through and reach Earth's surface.
Greenhouse effect is caused by the presence of greenhouse gases in the atmosphere and the trapping of energy within the lower atmosphere.
Greenhouse gases can be defined as the gases that trap heat within the Earth's atmosphere. Some examples of greenhouse gases present in the atmosphere are:
Carbon dioxideMethaneWater vaporOn a related note, greenhouse effect refers a terminology that is used to describe the role that greenhouse gases play in keeping the temperature of planet Earth warm.
In conclusion, greenhouse effect is typically caused by the presence of greenhouse gases in the atmosphere and the trapping of energy within the lower atmosphere.
Find more information: https://brainly.com/question/1577730
What is the most obvious sign of bias in a historical text?
A.
incorrect information and lack of reference sources
B.
strong language, expressing either like or dislike
C.
repetition of the same information over and over
D.
talking only about a single historical event
Answer:
the answer is b,the answer has to be even though I'm not very sure about it
Chlorine has a total of 17 electrons and 7 Valence electrons. Why are these two numbers
different?
Chlorine contains a total of 17 electrons which are filled in different orbitals of which 7 electrons are located in the outermost energy level or orbital.
What are valence electron?In an atom, the electrons are surrounding the nucleus through fixed paths or energy levels called orbitals. Electrons are filled in the increasing order of energy level. Thus lower energy levels are filled first.
The last electrons are filled in the outermost energy levels and are called valence electrons. Each shell have a definite capacity for electrons.
Cl is 17the element in periodic table and has 17 electrons of which 7 electrons are located in the outermost shell. Hence, option A is correct.
To learn more about chlorine, find the link below:
https://brainly.com/question/14962130
#SPJ5
On a hot day, you sit on the edge of a pool and dip your feet into the water, causing changes to occur that are related to the physical and thermal properties of your feet and of the water. Select the statements that accurately describe what is happening, in terms of the heat and temperature of the objects and substances. There may be more than one accurate statement.
A.
Cold from the water reduces the temperature of your feet.
B.
Heat from your feet raises the temperature of the water.
C.
Your feet transfer heat into the surrounding water, reducing the temperature of your feet.
D.
Cold from the water moves into your warm feet.
What type of solid is formed when a bond occurs between magnesium and oxygen?
1) Metallic
2) Molecular
3) Ionic
4) Network
Answer:
3) Ionic
Explanation:
The solid formed when a bond occurs between magnesium and oxygen is an ionic bond. This bond type occurs between a metal and non-metal.
Magnesium is the metalOxygen is the non - metalDue to the large electronegativity difference between the two species, the metal loses electrons which the non-metal oxygen gains They both complete their octet and electrostatic attraction leads to the formation of ionic bonds.4. What happens when a bond is formed between a greenish yellow gaseous element X and a
soft metallic element Y.
A Atom X gains an electron.
B Atom X loses an electron.
С Atom Y gains an electron.
D X and Y share a pair of electrons
Answer:
A. Atom x gains an electron
Explanation:
What happens when a bond is formed between a green gaseous element and a soft metallic element?（2.0分）
A. The gas atoms gain an electron.
B. The gas atoms lose an electron.
C. The metal atoms gain an electron.
D. The two elements share a pair of electrons
Atom X gains an electron because it needs electron to become stable.
Atom Y loses electron and atom X gains an electron in order to complete its outermost shell. Atom Y belongs to metal which has one electron while on the other hand, atom Y belongs to halogens which needs one electron for the completion of its outermost shell and become stable so atom Y loses one electron and atom X gains that electron and attain the electronic configuration of noble gases so we can say that Atom X gains an electron.
Learn more: https://brainly.com/question/19509418
At which location are metamorphic rocks most likely to
form?
оооо
D
С
В
A
Done
Intro
HELP PLEASE
Answer:
D
Explanation:
Answer:
c
Explanation: