Answer:
One or more number of species which have same number of atomic number but different mass number are called isotopes.
For example, [tex]^{1}_{1}H, ^{2}_{1}H, ^{3}_{1}H[/tex] are the isotopes of hydrogen.
So here, the atomic number of each of these isotopes is 1 and have different mass number, that is, 1, 2, 3.
What are the top industries in the north east?
Answer:
Explanation:
Map of Industries by State in the Northeast
Agriculture.
Oil & Gas, and Mining.
Construction.
Manufacturing.
Wholesalers.
Retail.
Transportation.
Utilities.
is sugar made of tiny particles
if a dog pushes a toy car with 95N of force for 1w meters in 30seconds how much power did he use
Answer:
Hi... If your distance is 1 meters your answer is 95
But if your distance is 12 that you typed wrong, your answer is 12*95=1140
Samuel tripped while playing basketball and skinned his knee on the concrete. Many of the skin cells on that knee were killed or removed entirely, leaving his knee open and unprotected. Eventually, his knee scabbed over, and when the scabs fell off, there was new skin underneath. Where did the new skin come from? A. Skin cells near the injury increased in size to cover the injury. B. Existing cells near the injury changed into skin cells to cover the injury. C. Extra skin cells from other parts of Samuel's body were moved to the injury. D. Existing skin cells near the injury reproduced to make new cells.
Answer:
D. Existing skin cells near the injury reproduced to make new cells.
Samuel tripped while playing basketball and skinned his knee on the concrete. Many of the skin cells on that knee were killed or removed entirely, leaving his knee open and unprotected. Eventually, his knee scabbed over, and when the scabs fell off, there was new skin underneath. The new skin come from Existing skin cells near the injury reproduced to make new cells.
What are cells in our body?Cells are the smallest unit in living organisms which lives on it's own and makes up tissues in living organisms. The Four Main Types of Cells are-
Epithelial Cells.
Nerve Cells.
Muscle Cells.
Connective Tissue Cells.
The body of an average man contains around 30 to 40 trillion cells.
Cells provide structure and function for all living things, from microorganisms to humans. Scientists consider them the smallest form of life. Cells house the biological machinery that makes the proteins, chemicals, and signals responsible for everything that happens inside our bodies.
Cells can vary between 1 micrometer (μm) and hundreds of micrometers in diameter. Within a cell, a DNA double helix is approximately 10 nanometers (nm) wide, whereas the cellular organelle called a nucleus that encloses this DNA can be approximately 1000 times bigger (about 10 μm).
Therefore, The new skin come from Existing skin cells near the injury reproduced to make new cells.
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226
) Which equation represents the radioactive decay of Ra?
88
Answer:
A
Explanation:
The study of a chemical is called chemistry.
The correct answer is A
Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive.
The radioactive of the Ra is option A that is:-
[tex]RA^{226}_{88}----->Rn^{222}_{86} +He^4_2[/tex].
During the decomposition, the element is breakdown into the neutron, proton, and electron.
Hence, the correct answer is A.
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if a block weighs 125 grams and it has a volume of 5 mL, what is it's density?
Count the atoms in this common formula for the explosive TNT
2C7H5(NO2)3
Answer:
Explanation:
7 carbon atoms, 6 hydrogen atoms,9 NO2 atoms
7+6+9=22
2(22)=44
44 atoms
First Name * hey can some one help
lexi
Last Name *
tomson
Hour
1
2
3
5
7
8
What is density? *
1 point
How much space something takes up
How many particles are in a given space
How much something weighs
What color something is
If something is more dense, what does that mean? *
1 point
The particles are closer together
The particles are further apart
It weighs more
It weighs less
As the air molecules in the balloon and bottle warmed up what happened? *
1 point
They got closer together
They spread further apart
They didn't change at all
The same principles of molecule movement that occurred in the cups also occurred in the balloon and bottle. (Hint: Did the molecules move the same ways?) *
1 point
True
False
What happened to the bubble seal when the bottle was placed in warm/hot water? *
1 point
It popped
It shrank (got smaller)
It expanded (got bigger)
Answer:
1.VOLUME– The amount of space an object takes up. Basic Unit (SI Unit) for Solids – Cubic Meter, m3. LENGTH/DISTANCE – The measurement between two points.
2.one particle per cubic meter.
3.it means it is heavier
4.In a liquid the particles are still close together but a little further apart than in a solid.
5.In gases the particles are much further apart than in solids or liquids.
Explanation:
thats all i can type lol
urgent plzz help meeee thx
Answer:
8
Explanation:
From the question given above, the following data were obtained:
t–butyl ion = (CH₃)₃C⁺
Number of valence electron =?
The valence electron(s) talks about the combining power of an element or compound as the case may be.
Considering the t–butyl ion, (CH₃)₃C⁺ we can see that it has a charge of +1 indicating that it has given out 1 electron to attain the stable octet configuration which has a valence electrons of 8. Thus, the valence electron of t–butyl ion, (CH₃)₃C⁺ is 8
Chemical reactions and nuclear reactions cause matter to change in different ways. Which two statements describe how matter changes only in a nuclear reaction?
A. Some energy is transformed into mass. B. New elements are formed.
C. The total mass of the reactants is. conserved.
D. The atomic nuclei change.
Chemical reactions and nuclear reactions are the types of reactions. In a nuclear reaction, some energy is transformed into mass, and the atomic nuclei change.
What is a nuclear reaction?A nuclear reaction is a reaction that involves a change in the structure of the nucleus of the atom with a release of energy. The atomic nuclei collide to release energy and result in nuclides.
The atomic nuclei change after the collision and result in the formation of the isotope and isobars. The bombardment of the atomic nuclei releases energy in the form of mass.
Therefore, option A. energy is transformed into mass, and option D. change in atomic nuclei are the changes of the nuclear reaction.
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how many moles of molecules are there in 18 grams of hydrogen. Pls help fast ASAP
Answer:
It is equal to Avogadro's number (NA), namely 6.022 x1023.
Answer:
It is equal to Avogadro's
number (NA), namely 6.022×1023
What is the mass number of an element that has 6 protons, 8 neutrons, and 6 electrons?
Answer:
14
Explanation:
the mass number = protons number +neutrons number
so..
6+8=14
What happens to the ground particles when they’re hit by sunlight
Answer:
The Earth absorbs most of the energy reaching its surface
Explanation:
a small fraction is reflected. In total approximately 70% of incoming radiation is absorbed by the atmosphere and the Earth's surface while around 30% is reflected back to space and does not heat the surface.
An indicator is used to measure the ___
Answer:
Small distances and angles
Explanation:
In various contexts of science, technology, and manufacturing (such as machining, fabricating, and additive manufacturing), an indicator is any of various instruments used to accurately measure small distances and angles, and amplify them to make them more obvious.
explain why the properties of a reactant can be different from the properties off the products of the reaction
Answer:
The reactants and products in a chemical reaction contain the same atoms, but they are rearranged during the reaction. As a result, the atoms end up in different combinations in the products. This makes the products new substances that are chemically different from the reactants.
Explanation:
What is the bio-nuclear basis of a carbonated nuclei?
A. NST
B. NS
C. BS
D. AOTA
Answer:
IM GONNA SAY THE ANSWER IS D. All of the above!
Explanation:
NST - NO SUCH THING
NS - NONSENSE
BS - BULL SHHHHHH
AOTA - ALL OF THE ABOVE
LOL
Iosefa multiplies 8.64 g by 2.0 mL to find the density of the liquid that he has collected in an experiment. How should he report his answer with the correct number of significant figures?
17.3
17
17.28
17.2
The correct number of significant figures : 17
Further explanationGiven
mass = 8.64 g
volume = 2 ml
Required
The density of liquid
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
The density :
ρ = 8.64 : 2
ρ = 4.32 g/ml
If we want to find density, then the steps should be as above
But if we ignore the density and just want to find the multiplication value to clarify the significant figure, then we must pay attention to the rule of multiplication, that is, the end result of the multiplication has the least significant number of the numbers involved in multiplying.
8.64 = 3 sig fig
2.0 = 2 sig fig
then the product contains 2 sig fig
8.64 x 2.0 = 17.28 rounded to 2 sig fig ⇒ 17
1.
Explain what changes occur in particle motion, temperature,
and state of a pure substance when thermal energy is added
or removed.
Type your answer here
Answer:
Thermal energy is heat energy.
When it is removed, the temperature of particle decreases due to decrease in the internal energy involving that particle.
Motion of the particle decreases due to decrease in kinetic energy caused by reduction in the internal energy.
The state of the particle changes from that current state e.g liquid or gas to a solid state due to increase in the latent heat of vapourisation.
With thermodynamics we can find that by giving energy to a substance the temperature increases and after a certain value it can change from solid to liquid and vapor state
In the opposite case, as the energy of a substance decreases, the temperature decreases and goes from a gaseous state to a liquid and a solid.
Thermodynamics study the changes that substances have as their energy changes, finding macroscopic relationships such as temperature, state, pressure and volume.
The temperature of a substance is a measure of the internal energy of the particles and the thermodynamic state of a substance can be solid, liquid or gaseous depending on whether the shape and volume is maintained.
Let's analyze what happens when we increase the energy of a substance.
In this case, the particles that form has more energy, so the temperature of the substance increases, if the energy is enough to break any bonds, the substance can go from the solid state to the liquid and by continuing to increase the energy it can be break all the bonds going from the liquid to the gaseous state.
In the opposite case, when the energy of the particles decreases, it has smaller movements, therefore its temperature decreases and if some bonds are formed, the substance stops from the gaseous state to the liquid state and if the energy continues to decrease, more bonds are formed passing the liquid state to solid.
In conclusion, with the change in energy, the temperature changes in the same direction and after a certain value it can go from solid to liquid and as the temperature increases more it can go from liquid to gas.
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The image above was taken by the Galileo spacecraft as it visited the asteroid belt on its way to Jupiter. Shown in the image are two rocky-iron bodies. The large object on the left is an asteroid named Ida. The object on the right, which measures only about 1 mile across, is named Dactyl.
Dactyl is a tiny moon that orbits the asteroid Ida. Dactyl orbits Ida due to
A.
the mutual gravitational attraction between the two objects.
B.
small differences in the objects' rocky-iron compositions.
C.
electrical energy transferred between the two objects.
D.
the magnetic force field that defines the asteroid belt.
Answer:
Dactyl orbits Ida due to;
A. The mutual gravitational attraction between the two objects
Explanation:
An orbit is the curved repeating and regular gravitational path of an object that moves round another planet. An object in an orbit moves with the orbital velocity required to bring about an equilibrium between the the mutual gravitational pull (attraction) from the body around which the object cycles and the object and the object's inertia to move in a straight line
Therefore, the moon Dactyl is able to orbit the asteroid Ida due to the force of gravitation between the Dactyl and Ida.
Answer:
A. The mutual gravitational attraction between the two objects
Explanation:
Help for the last two please
Answer: gamma& the firt one
Explanation:
Answer:
Gamma waves travel faster than radio waves; microwaves have a higher frequency and less energy.
Explanation:
Although radio waves have a longer wavelength, gamma waves come in more frequently making them faster.
Microwaves tend to have a state of a non-ionizing material which happens to have a higher frequency but to the point that microwaves produce heat to vibrate strongly, it creates less energy than radio waves.
which of the following is an acid?
starch in water
sugar in water
toothpaste in water
vinegar
bleach
1. What type of reaction is this?
H2O + H2 + O2
A. Synthesis
B. Decomposition
C. Combustion
D. Single Replacement
E. Double Replacement
I say synthesis
Answer:
B if you meant [tex]H_{2}O[/tex]->[tex]H_{2} +O_{2}[/tex]
Explanation:
A. Synthesis: reaction where two or more reactants combine to form one product. A+B->AB
B. Decomposition: reaction where a single compound reacts to form more than one product. AB-> A+B
C. Combustion: any reaction in which a substance reacts with oxygen gas. (needs [tex]O_{2}[/tex])
D. Single replacement: a type of reaction where one element replaces a similar element within a compound. Reaction is always an element and a compound.
E. Double replacement: a type of reaction where the ions of two compounds exchange places in an aqueous solution to form two new compounds. AB+CD->AD+CD
Please help me !!!!
Answer:
12, 28, 16
Explanation:
If we are trying to find mass, neutrons are our guy. 28 "mass points" means 28 neutrons. Each neutron is one point
We know there are 12 protons and electrons if we look at a table of elements, the number in the top-left is always the number of protons and we can subtract mass from the protons to get our electrons
Iodine consists of simple molecules. Which of the following is a property of simple molecules?
A - Have no overall electric charge
B - They conduct electricity
C - Have high boiling points
D - Have giant structures
Answer:
A - Have no overall electric charge
Explanation:
Ideally, atoms of elements are chemically bonded to form molecules. A molecule is said to be a SIMPLE MOLECULE if it contains only a few atoms linked strongly together by covalent bonding. Examples of simple molecules are O2, CO2, I2, Cl2 etc.
The following properties are possessed by simple molecules:
- They have no overall electric charge
- They have low melting and boiling points due to the weak intermolecular forces that are easily overcomed when temperature is applied.
- Since they have no net charge, they do not conduct electricity.
- As their name implies, they rather have simple structures.
Explain in terms of intermolecular forces, why pure hydrogen has a lower boiling point than hydrogen bromide.
Both the pure hydrogen and hydrogen bromide is held by weak intermolecular forces of attaction between molecules. Bromide has larger size of electron cloud than Hydrogen, leading to a greater extent of polarisation of the electron cloud. This results in stronger van der Waals' forces of attraction in hydrogen bromide compared to the pure hydrogen. More energy is required to break the stronger bonds in hydrogen bromide than pure hydrogen, leading to a higher boiling point in hydrogen bromide. Thus, pure hydrogen has a lower boiling point.
Explanation:
the strength of intermolecular forces of attraction rely on the size of the electron cloud. the greater the atomic number, the greater the size of the electron cloud and thus, the stronger the forces of attraction.
When asnwering a qn, you want to first state the structure and bonding of the compound, then compare the size of their electron clouds.
Answer structure:
greater size of electron clouds -> greater extent of polarisation of electron cloud -> stronger van der Waals' forces of attraction -> more energy required to overcome the bonds -> higher boiling point
Pure hydrogen has a lower boiling point than hydrogen bromide due to weak intermolecular forces.
What are intermolecular forces?Intermolecular forces are those forces which binds different molecules all together.
Bromide's electron cloud is larger than Hydrogen's, resulting in more polarisation of the electron cloud. In comparison to pure hydrogen, hydrogen bromide has greater van der Waals forces of attraction. Because the stronger bonds in hydrogen bromide need more energy to break than pure hydrogen, it has a higher boiling point. Pure hydrogen has a lower boiling point as a result.
Hence due to less intermolecular forces hydrogen bromide has a lower boiling point.
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Think about the different methods you used to travel from one place to another today. Describe two of these ways. For each, identify the energy source that caused the movement.
Answer:
An example could be using a car, bicycle, bus, etc.
Explanation:
From there you would identify the energy source as it says and describe them in a pargaraph.
For instance to describe a solar panels' energy. You would say the energy source is heated from the sun.
how many carbons are present on the reactant side??
Answer:
1
Explanation:
The equation is already balanced, and on the left hand side (reactants side), we see that there's one CH4 molecule and 2 O2 molecules. We don't care about the O2 molecules in this case, so we turn our focus to the CH4 molecule. One CH4 molecule has one carbon atom and 4 H atoms, so we know that there's only one carbon atom on the reactants side.
Answer:
1
Explanation:
One carbon in CH4 is present on reactant side
Where is our Solar System located?
Answer:
In space ( the sun and it's atmospheres )
if evaporation occurs what will change 0.70 molar solution of CuSO4
A. Molarity will increase
B. Molarity will decrease
C. the amount of CuSO4 will decrease
D. No change in molarity or amount of salute
Answer:
A. Molarity will increase .
Explanation:
Molarity = moles of solute per litre of solution
= moles of solute / volume of solution
If evaporation occurs , volume of solution decreases and moles of solute remains constant . Hence denominator decreases and numerator remains constant .
Hence the molarity increases .
There are 25 elements found in living things. How many of these elements are found in some organisms but not all?
O1
O 6
O 19
O 25