Answer:
H20 because u can touch it
An option that correctly represents a chemical element is known as hydrogen. Thus, the correct option for this question is D.
What is a Chemical element?A chemical element may be defined as a type of substance that can't be broken down into its simpler form by non-nuclear reactions. It is generally composed of a species of atoms that have a given number of protons in their nuclei.
According to the context of this question, water is a compound because it is made up of water molecules. Water molecules are made up of atoms of hydrogen and oxygen. Sodium chloride is also a chemical compound because it is also made of atoms of sodium and chlorine.
Therefore, an option that correctly represents a chemical element is known as hydrogen. Thus, the correct option for this question is D.
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is mineral oil ionic or covalent
Answer:
Iconic
Explanation:
hope this helps :) x
In n=6 the correct sequence for filling of electron will be
Answer:
If n=6, the correct sequence for filling of electrons will be ns→(n−2)f→(n−1)d→np
if i put a ice cube on a table what type of phase would occur
melting
freezing
condensation
evaporation
Answer:
melting
Explanation:
the ice would turn to water before it evaporated
When we convert one metric unit to another the conversion factor is always exactly equal to 1. true or false
Answer:
The answer is True.
Explanation:
You can use similar processes when converting from smaller to larger units. When converting a larger unit to a smaller one, you multiply; when you convert a smaller unit to a larger one, you divide.
The standard unit of radiation related to biologic hazard is known as the .
Answer:
the standard unit of radiation related to biological hazards is known as the Roentgen.
Explanation:
To calculate the relative age of rocks, geologists use the rate of radioactive decay of isotopes present in their samples. What is the term used for the original amount of
the elemental isotopes being investigated?
A rare earth isotopes
B. Son isotopes
C. daughter isotopes
D. parent isotopes
To calculate the relative age of rocks, geologists use the rate of radioactive decay of isotopes present in their samples. Rare earth isotopes the term used for the original amount of the elemental isotopes being investigated. Therefore, option A is correct.
What is isotope ?Isotopes are different nuclear forms of the same element. They share the same atomic number and periodic table position, but their nucleon numbers differ due to different numbers of neutrons in their nuclei.
The rare-earth elements as a group have a high number of isotopes, ranging from 24 for scandium to 42 for cerium and averaging around 35 without counting nuclear isomers.
According to estimates, the total global reserve of rare earths is around 120 million metric tons. The majority of these reserves, estimated at 44 million metric tons, are in China.
Thus, option A is correct.
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describe how electrical energy can be transformed into mechanical energy within a magnetic field.
Answer:
this is the answer to your question bro or sis
If you used a heat lamp instead of a flashlight, which penny would get the hottest?
Question in picture below
Answer:
Models 1 and 2 would be in the same group.
Explanation:
They have the same amount of valence electrons. Valence electrons are electrons in the outermost electron cloud. This means they have the same properties, therefore are in the same Group on the periodic table.
Wish of the following BEST describes an orbital?
a
According to the Bohr model of the atom, it is a three dimensional region of space where there is a 90% probability of finding a neutron at any given moment in time.
b
According to the Bohr model of the atom, it is a three dimensional region of space where electrons are constantly found.
c
According to the quantum mechanical model of the atom, it is a three dimensional region of space where protons are constantly found
d
According to the quantum mechanical model of the atom, it is a three dimensional region of space where there is a 90% probability of finding an electron at any given moment in time.
Answer:d
b/c the bohr atomic model say that the electron are present in the orbits where the modern physics suggests that according to hisenberg uncertainity principle u cannot locate an electron but can find its maximum probibility in a given region and that is named as orbital
The statement best describes an orbital is according to the quantum mechanical model of the atom, it is a three dimensional region of space where there is a 90% probability of finding an electron at any given moment in time. Therefore, option D is correct.
What the quantum mechanical model of the atom ?The quantum mechanical model of atoms describes the three-dimensional position of the electron in a probabilistic manner using a mathematical function known as a wave function, which is frequently denoted as. Orbitals are another name for atomic wavefunctions.
The quantum mechanical model determines the allowed energies of an electron and the likelihood of finding the electron in different locations around the nucleus.
Electrons in the same atom with the same principal quantum number (n) or principal energy level are said to occupy an electron shell of the atom in the quantum-mechanical model of an atom. Orbitals are regions of space where electrons are likely to be found.
Thus, option D is correct.
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why don't the praticles in a solid move past one another
Answer:
Particles in a solid object are super tight and close to eachother. They do not move past eachother because it is a solid, not a liquid or gas.
Explanation:
Solid – In a solid, the attractive forces keep the particles together tightly enough so that the particles do not move past each other. Their vibration is related to their kinetic energy. In the solid the particles vibrate in place.
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use dimensional analysis to slove; a reasearcher is given 1.5 dry oz of a substance which he needs to evenly distribute over 10 vials. how many micrograms schools each vial contain? show all work.
Answer:
4.25248 x [tex]10^{6}[/tex] μg per vial
Explanation:
Conversion Factors
28.3495231 g = 1 dry oz
[tex]10^{6}[/tex] μg (micrograms) = 1 g
[(1.5 dry oz) x (28.3495231 g / 1 dry oz) x ([tex]10^{6}[/tex] μg / 1 g)] / 10 vials = 4,252,428.465 μg / vial
Please help with my chemistry homework
Answer:
amu, atomic number, electrons, atomic mass
Explanation:
Mrs. Rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. Which combination could she
use to produce the hydrogen she needs?
NaOH and oil
Zn and KOH
H2SO, and CaCO
0 Mg and HCI
I’ll mark your reply if the answer was correct.
Answer:
Its D
Explanation:
I took the Unit Test on Edge
Answer:
D. Mg and HCl
can protons neutrons and electrons be found on the ptoe?
A student pushes against a wall with 30 Newton’s of force and the wall does not move
Answer:
you can't go through a solid unless you broke the atoms in the wall
The value equal the sum of the protons and neutrons in the nucleus of an atom
The Atomic Number should be your answer, although I am not completely sure.
why do scientist study volcanos!!
Answer:
Volcanologists use many different kinds of tools including instruments that detect and record earthquakes (seismometers and seimographs), instruments that measure ground deformation (EDM, Leveling, GPS, tilt), instruments that detect and measure volcanic gases (COSPEC), instruments that determine how much lava is moving underground (VLF, EM-31), video and still cameras, infrared cameras, satellite imagers, webcams, etc!
Explanation:
I HOPE IT HELPED
Answer:
what the other guy said
Explanation:
How long will it take a piece of strontium-90 (produced in a nuclear test blast) weighing exactly 1000.0 g to be
reduced to 15.625 g? The half-life of strontium 90 is 28.8 years,
Answer:
Time taken 172.8 years
Explanation:
Given data:
Total amount of strontium-90 = 1000.0 g
Amount left = 15.625 g
Half life of strontium = 28.8 years
Time taken = ?
Solution:
Number of half lives:
At time zero = 1000.0 g
At first half life = 1000.0g/2 = 500 g
At second half life = 500 g/2 = 250 g
At third half life = 250 g/ 2 = 125 g
At 4th half life = 125 g/ 2= 62.5 g
At 5th half life = 62.5 g/2 = 31.25 g
At 6th half life = 31.25 g / 2 = 15.625 g
Time taken:
Time taken = number of half lives × half life
Time taken = 6×28.8 years
Time taken = 172.8 years
A student estimates that 27 students will attend this month's
Science Club meeting 34 students attend. What was the
student's percent error?
Answer:
I think 20.58 so 21%?
Explanation:
This HAS to be an answer for second graders
Where do different kinds of apples come from?
Changing a solid to a liquid to a gas is changing the
matter.
*
Your answer
Answer:
i could help you can you explain more plzzzzzz i really need points
Explanation:
Answer:
It is changing the state of matter.
How are electrons arranged around the nucleus of an atom
Answer: electrons are arranged in shells around an atom's nucleus.
Explanation:
M= 25.4 g
V= 12.2 mL
D=
Answer:
Explanation:
density = m/v
answer = 2.0819 g/ml
rounded (correct sig figs) = 2.08
Answer:
About 2.08 g/mL
Explanation:
25.4g ÷ 12.2 mL = 2.0819..... g/mL
About 2.08 g/mL
which sentece is a scentific statement
A 32.5 g sample of metal X require 659 J of energy to heat it from 10°C to 77°C calculate the specific heat capacity of metal X. Round your answer to significant figures.
3.35 J/g °C
0.303 J/g °C
2170 J/g °C
169 J/g °C
Answer:
0.303 J/g°C.
Explanation:
From the question given above, the following data were obtained:
Mass (M) of metal = 32.5 g
Heat (Q) required = 659 J
Initial temperature (T1) = 10 °C
Final temperature (T2) = 77 °C
Specific heat capacity (C) of metal =.?
Next, we shall determine the change in temperature of the metal. This can be obtained as follow:
Initial temperature (T1) = 10 °C
Final temperature (T2) = 77 °C
Change in temperature (ΔT) =.?
Change in temperature (ΔT) = T2 – T1
Change in temperature (ΔT) = 77 – 10
Change in temperature (ΔT) = 67 °C
Finally, we shall determine the specific heat capacity of the metal as follow:
Mass (M) of metal = 32.5 g
Heat (Q) required = 659 J
Change in temperature (ΔT) = 67 °C
Specific heat capacity (C) of metal =.?
Q = MCΔT
659 = 32.5 × C × 67
659 = 2177.5 × C
Divide both side by 2177.5
C = 659/2177.5
C = 0.303 J/g°C
Therefore, the specific heat capacity of the metal is 0.303 J/g°C.
The Hot-Wheel car was accelerating across the table at 0.25 meters per second squared (m/s^2) from an applied force of 10 N. What is the mass of the Hot Wheel car? *
40 grams
2.5 grams
0.025 grams
cannot be determined
Answer:
Explanation:
Consider the motion of a Hot Wheels car beginning from rest at an elevated position. The Hot Wheels car rolls down a hill and begins its motion across a level surface. Along the level surface, the Hot Wheels car collides with a box and skids to a stop over a given distance. How could work and energy be utilized to analyze the motion of the Hot Wheels car? Would the total mechanical energy of the Hot Wheels car be altered in the process of rolling down the incline or in the process of skidding to a stop? Or would the total mechanical energy of the Hot Wheels car merely be conserved during the entire motion?
Of course the answers to these questions begin by determining whether or not external forces are doing work upon the car. If external forces do work upon the car, the total mechanical energy of the car is not conserved; the initial amount of mechanical energy is not the same as the final amount of mechanical energy. On the other hand, if external forces do not do work upon the car, then the total mechanical energy is conserved; that is, mechanical energy is merely transformed from the form of potential energy to the form of kinetic energy while the total amount of the two forms remains unchanged.
While the Hot Wheels car moves along the incline, external forces do not do work upon it. This assumes that dissipative forces such as air resistance have a negligible affect on the car's motion. This is a reasonable assumption for the low speeds of the car and its streamline characteristics. Since external forces do not do work on the car, the total mechanical energy of the car is conserved while moving along the incline. As the work-energy bar charts in the animation below depict, energy is transformed from potential energy (the stored energy of position) to kinetic energy (the energy of motion). The car gains speed as it loses height. The bar chart also depicts the fact that the total amount of mechanical energy is always the same; when the two forms are added together, the sum is unchanging.
When the Hot Wheels car collides with the box and skids to a stop, external forces do a significant amount of work upon the car. The force of friction acts in the direction opposite the car's motion and thus does negative work upon the car. This negative works contributes to a loss in mechanical energy of the car. In fact, if 0.40 Joules of mechanical energy are lost, then -0.40 Joules of work are done upon the car. As this work is done, the mechanical energy of the car (in the form of kinetic energy) is transformed into non-mechanical forms of energy such as sound and heat.
What affects the direction of the current
Answer:
direction of the wire moves in and the direction of magnetic field.
Are the effects of adding heat reversible
Answer:
yes they are
Explanation:
if you are heating up glass i believe not, unless you want to break the glass. Making glass go from high to low or low to high tempuatures quickly will cause it to break. How ever metal will be stronger as long as you dont bend it.
The simple unit of a compound
Answer:
the basic unit of an ionic compound is called a formula unit and the basic unit of a covalent compound is a molecule.
