Answer:
Answer is 1
Explanation:
how many modern periodic table contains
Answer:
118 elements in the periotic table
Explanation:
:)
calculate the amount of magnesium that will react with 16.0 g of oxygen to produce 40.5 g of magnesium oxide.
Answer:
24.3g
Explanation:
Mr of Oxygen = 16 (15.999)
Mr of Magnesium = 24.3 (24.305)
Mass / Mr = moles
16.0g / 16 = 1
Mr x moles = Mass
24.3 x 1 = 24.3g
what happens to iron if it's left in
moisture for few days?
Answer:
The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.
Explanation:
this is what will happen in water
will mark brainlest 1) Now that you have studied the facts about the Severn River, you are ready to make a decision. What questions would you want answered if you were to determine whether to build a tidal power plant at the Severn River?
Answer:
The questions I would like to answer are:
Will the productivity of the river severn offset the cost of installing the plant?
Is it possible to build a dam on site?
Is it possible to establish submerged turbines in this location?
How would human life and nature be impacted by the plant?
Explanation:
Tidal power plants are signals that use tidal energy to generate electricity. The installation of this type of plant is quite expensive and involves the establishment of dams on site to take advantage of the differences between high and low tides and the establishment of submerged turbines to take advantage of sea currents.
To decide whether I would decide to build a tidal plant on the Severn River, I would need to evaluate a few things to make sure that the project is viable. For that I would ask myself some questions like:
Will the productivity of the river severn offset the cost of installing the plant? (If the installation costs are greater than the capacity of this river to promote high generation of electricity, it would be better to abandon the project)
Is it possible to build a dam on site? Is it possible to establish submerged turbines in this location? (It is necessary to consider the physical and chemical characteristics of the place to know if it is possible to install these two equipment and in a way that they work efficiently)
How would human life and nature be impacted by the plant? (Projects like this include major environmental and social impacts. These impacts must be analyzed and ways to mitigate them must be considered and included in the project.)
what is a respiratory system
Answer:
Body system that helps to breathe
Explanation:
Hope this helps! follow and message me in the comments if u need more explanation!
Answer:
The respiratory system consists of the set of organs and tissues involved in the uptake of oxygen from the atmosphere and the release of carbon dioxide generated during aerobic respiration. This gas exchange is also called breathing or external respiration.
Explanation:
What is it about the structure of magnesium atoms that makes them react more slowly than sodium atoms?
Answer:
A reactive metal has the ability to easily lose an electron and acquire a positive charge. Sodium easily loses electrons and acquires a positive charge. Sodium easily lose electrons than magnesium and get oxidized to easily.
Explanation:
I really need help on this question! Thank you so much!
Answer:
A. Empirical formula => C₂H₄O
B. Molecular formula => C₄H₈O₂
Explanation:
From the question given above, the following data were obtained:
Mass of C = 0.273 g
Mass of H = 0.046 g
Mass of O = 0.182 g
Molar mass of compound = 88 g/mol
A. Determination of the empirical formula of the compound.
C = 0.273 g
H = 0.046 g
O = 0.182 g
Divide by their molar mass
C = 0.273 /12 = 0.023
H = 0.046 /1 = 0.046
O = 0.182 /16 = 0.011
Divide by the smallest
C = 0.023 / 0.011 = 2
H = 0.046 / 0.011 = 4
O = 0.011 / 0.011 = 1
Thus, the empirical formula of the compound is C₂H₄O
B. Determination of the molecular formula of the compound.
Empirical formula = C₂H₄O
Molar mass of compound = 88 g/mol
Molecular formula =?
Molecular formula = [C₂H₄O]ₙ
[C₂H₄O]ₙ = 88
[(12×2) + (4×1) + 16]n = 88
[24 + 4 + 16]n = 88
44n = 88
Divide both side by 44
n = 88 / 44
n = 2
Molecular formula = [C₂H₄O]ₙ
Molecular formula = [C₂H₄O]₂
Molecular formula = C₄H₈O₂
HELP ASAP _is a device with a central catheter that is implanted in the subcutaneous tissue
A.Leuer lock
B.Port
C.Cannula
D.Catheter
The atmosphere insulates the planet by trapping which of the following?
Solid particles
Thermal energy
Ice crystals
Wind
Answer:
The answer is thermal energy
Explanation:
1.
what can noble gases be used for?
2.
what is a vertical column called in the periodic table
3.
what is the horizontal column in the periodic table
Answer:
1. They are mostly used to protect materials and prevent chemical reactions.
2.These are Groups
3. I guess it is Rows
Jennifer has a mass of 60 Kg and
is accelerating down the hill at a
rate of 3 m/s/s. What is the force
acting on Jennifer?
Answer:
the force acting on Jennifer is 180 N
Explanation:
The computation of the force acting on Jennifer is shown below:
As we know that
Force = mass × acceleration
= 60 kg × 3 m/s
= 180 N
hence, the force acting on Jennifer is 180 N
We simply applied the above formula
What affects both deep water and surface currents in the ocean?
Answer:
These currents are on the ocean's surface and in its depths, flowing both locally and globally. Winds, water density, and tides all drive ocean currents. Coastal and sea floor features influence their location, direction, and speed. Earth's rotation results in the Coriolis effect which also influences ocean currents. -
Answer: The Coriolis effect
Explanation:
Please help me with this
How many carbon atoms are in 15.6 kg of acetone? acetone is ch3coch3. the density of acetone is 1.30 g/ml?
1. Which type of matter has the molecules packed closer together?
a. Solid
b. Liquid
c. Gas
d. Plasma
2. Matter is made up of __________.
a. Molecules
b. Particles
c. Atom
d. All of them
3. Particles with more energy move ________ than particles with less
energy.
a. Slower and closer together
b. Slower and farther apart
c. Faster and farther apart
d. Faster and closer together
4. Which best describes the particles in a liquid?
a. More freely moving than a gas
b. More freely moving than a
solid
c. Less freely moving than a
solid
d. Completely unmoving
5. Which of the following statements describes a mass?
a. The force of attraction between two bodies.
b. The force of gravity exerts on a body of mass.
c. The amount of matter in an object.
d. The weight of the object from place to place.
Answer:
1. Solid
2. atom
3. faster and farther apart
4.more freely moving than a solid
5.The amount of matte in an object
Explanation:
Answer:
1. Solid
2. Atom
3. Faster and farther apart
4. More freely moving than a solid
5. The amount of matter in an object.
How can you tell, from the drawings, that gravity is greater on Earth
than on Venus?
‼️ Physics‼️
Answer:
hi basically also also Aussie
Name:
1. The nucleus is the part of the atom that
A consist mostly of empty space
B.
has a negative charge
Coccupies most of the atom's total volume
D. contains most of the atom's total mass
Answer:
D.
Explanation:
There are three types of particles within atoms: protons, neutrons, and electrons.
Electrons have essentially no mass and orbit the nucleus in various energy levels.
Protons and neutrons have mass and are both found within the nucleus of the atom.
How many molecules are in 83.2 g of chlorine gas (C12)?
Answer:
3.2
Explanation:
dont trust me
Which gas is given out during burning process
Answer:
Carbon dioxide
I hope it helps
#captainpower
pls make me brainliest
22. A student carefully measures a certain quantity of four different substances
into trays that will be used in a laboratory exercise. Which of these trays would
contain the largest number of atoms?
Sample
Mass of tray
with sample
Water
Mass of
empty tray
37.86g
36.59g
37.418
55.88g
Table Salt (NaCl)
Copper Wire
95.03g
100.96g
245.20g
Lead Shot
38.08g
Answer:
Water
Explanation:
The substance that has the highest number of moles also has the highest number of atoms.
The number of atoms of a substance can be calculated using the Avogadro's number. This number gives the number of elementary entities such as atoms, molecules and ions in one mole of a substance.
All you need to do is to find out which substance has the highest number of moles. This substance will also have the highest number of atoms present.
Learn more about Avogadro's number: https://brainly.com/question/1445383
what did the law of octaves state about the elements
Law of octaves states that when the elements are arranged in ascending order of atomic mass, every eighth element has comparable properties.
What are the characteristics of law of octaves ?Features of law of octaves -:
Newland Octaves arranged the known 62 elements into 8 groups of 8 each. The elements were in increasing order of atomic weight.Every element shared properties with the 8th element after it.Some limitations were made into this -:
Learn more about law of octaves ,here:
https://brainly.com/question/756068
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The law of octaves state about the elements that there must be 8 electrons in the outermost or valance shell of the electron to obtained the stability.
What is octaves rule?when the elements are arranged in the increasing order of atomic mass, every eighth element has comparable properties and that was the first time an atomic number was introduced to each element of the periodic table.
To become the stable according to rule element must complete it octave otherwise it cannot be considered the stable one.
Therefore, law of octaves state about the elements that there must be 8 electrons in the outermost or valance shell of the electron to obtained the stability.
Learn more about octave rule, here:
https://brainly.com/question/13935829
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what would happen to a piece of iron if it were placed close to this device
Answer: c) it moves toward a piece of iron
Explanation:
what is the total number of moles of KCIO, needed to produce 6 mol of 02
Answer:
4 moles of potassium chlorate must be used to produce 6 moles of oxygen gas.
Explanation:
តើកាបូនមានវ៉ាឡង់ប៉ុន្មាន
Answer:
uuuhhh?
Explanation:
1. How many atoms of oxygen are present in 0.04 mole NaNO3?
2. How many moles of nitrogen atoms are present in 10.5g of N2O5?
3. How many atoms of oxygen are present in 50g of Fe(H20)2(S04)3? Please answer fast
Answer:
1. 7.227x10²⁴ O atoms
2. 0.1944 mol
3. 3.18x10²³ atoms
Explanation:
1. To solve this problem we need to use Avogadro's number, which states the number of molecules that are in 1 mol of a substance:
0.04 mol NaNO₃ * 6.023x10²³ molecules/mol = 2.409x10²⁴ molecules NaNO₃There are 3 O atoms per NaNO₃ molecule, thus the answer is (3* 2.409x10²⁴) 7.227x10²⁴ atoms.
2. First we convert 10.5 g of N₂O₅ into moles, using its molar mass:
10.5 g N₂O₅ ÷ 108 g/mol = 0.0972 mol N₂O₅There are 2 N moles per N₂O₅ mol, thus the answer is (2*0.0972) 0.1944 mol.
3. First we convert grams into moles:
50 g Fe(H₂O)₂(SO₄)₃ ÷ 379.85 g/mol = 0.132 molThen we use Avogadro's number:
0.132 mol * 6.023x10²³ molecules/mol = 7.95x10²² molecules Fe(H₂O)₂(SO₄)₃There are 14 O atoms per Fe(H₂O)₂(SO₄)₃ molecule, so the answer is (7.95x10²² * 4) 3.18x10²³ atoms.
WILL GIVE NRAINLIEST!! NEED HELP FAST
7. (50 points) If you have 25 grams of Aluminum (Al), how many moles of hydrogen
gas (H) can you make? Show work!
What kind of reaction is photosynthesis?
Answer:
endothermic reaction
Photosynthesis is an endothermic reaction. This means it cannot occur without energy (from the Sun). The light required is absorbed by a green pigment called chlorophyll in the leaves.
Explanation: hope this helps u!
Answer:
Endothermic reaction I believe.
Explanation:
It can't occur without the energy from the sun. The light is absorbed by the green pigment called chlorophyll which is in the leaves of the plant.
how many valence electrons are transferred from each potassium atom to nitrogen in the formation of the compound potassium nitride?
Answer:3 electrons
Explanation:
A mole of carbon has the same number of atoms as a mole of beryllium.
O True
False
Answer:
False.
Explanation:
Carbon = 12
Beryllium = 9
good luck, i hope this helps :)
How many moles of each element are in one mole of Be(OH)2? (3 points)
a. 1 mole of beryllium, 1 mole of oxygen, 2 moles of hydrogen
b. 1 mole of beryllium, 2 moles of oxygen, 2 moles of hydrogen
c. 2 moles of beryllium, 2 moles of oxygen, 2 moles of hydrogen
d. 2 moles of beryllium, 1 mole of oxygen, 1 moles of hydrogen
Answer:
b
Explanation:
Answer:
B
Explanation:
