Answer:
The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element's mass number.
A radioactive nucleus can change from one element to another. How does this happen?
A radioactive decay is occurring by the emission of charged particles such alpha or beta to form a new stable atom with changes mass number and atomic number.
What is radioactive decay?Heavy unstable radioactive elements undergo nuclear decay by which they form a stable isotope or new atom with changed atomic number. There are two types of nuclear decays mainly. They are alpha decay and beta decay.
During alpha decay isotopes with higher mass number undergo alpha emission and forming a new species with mass number reduced by 4 units and atomic number reduced by 2 units.
In the case of beta- decay, electrons are emitted from the atom and then forming a new atom with atomic number increased by one unit. For an electron capture process, an electron is captured to the atom forming an element with atomic number reduced by one.
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Which choice best defines heredity?
C. the cycle through which an organism grows from a young form to a mature form
D. the technology that enables scientists to insert genetic information from one organism into another
A. the joining of sex cells to form the first cell of a new organism
B. the passage of genetic instructions from one generation to the next
Answer:
B. the passage of genetic instructions from one generation to the next.
is Boiling water a chemical or physical change?
♥answer♥
Physical
♥explanation♥
Physical changes alter only the size, shape, form or matter state of a material. Water boiling, melting ice, tearing paper, freezing water and crushing a can are all examples of physical changes.
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♥ お力になれて、嬉しいです！♥how many elements and atoms are in marble
Answer:
Explanation:
Scientists know that there are 6x1023 molecules in a mole - so we have about 0.5x1023 molecules in our marble…and since every silicon dioxide molecule has one atom of silicon and two of oxygen, we have a grand total of 1.5x1023 atoms. That's 150,000,000,000,000,000,000,000 atoms
Which of the following best represents and explains the formula for a compound made from fluorine and hydrogen?
A. HF, because both fluorine and hydrogen are capable of forming only one ionic bond.
B. HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
C. H2F, because fluorine is short of two electrons, and hydrogen is short of one electron.
D. H2F, because fluorine is capable of forming one, and hydrogen is capable of forming two covalent bonds.
Thank you
The answer is B
HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond. The correct option is option B.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion. Covalent bond is weaker than ionic bond.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron.
The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
Therefore, the correct option is option B.
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What is the potential energy of a 5 kg apple that is sitting on a 1.5 m high
tree branch? GPE=ham
Answer:
PE = 73.58 J
Explanation:
Given data:
Mass of apple = 5 Kg
Height of tree = 1.5 m
Potential energy = ?
Solution:
Formula:
PE = mgh
g = 9.81 m/s
by putting values,
PE = 5 Kg × 9.81 m/s × 1.5 m
PE = 73.58 J (Kgm²/s = J)
if during the interaction of 36.5 g of hydrochloric acid with magnesium 137 kg of joules energy are released, how much energy would be released if 96 g of magnesium acted
Explanation:
ANSWER
The molarity =
molecularweight
density×purity×10
=
36.5
1.18×36.5×10
=11.8molar
NEED HELP PLSSSS THANK UU
Answer: rotation
Explanation:
orbitttttttttttt
Explanation:
The sum of all forces acting on an object.
Answer:
net force. sjiejsnssjwjehw
Answer:
net force or result force
Explanation:
mark brainliest please
How do I balance these?
Answer:
[tex]1S_{8} +12O_{2}=8SO_{3}[/tex]
[tex]2Al+6HCl=2AlCl_{3} +3H_{2}[/tex]
[tex]2Fe+3Cl_{2}=2FeCl_{3}[/tex]
[tex]2K+1Cl_{2}=2KCl[/tex]
Explanation:
atomic concept map. help me fill this out with the terms on the right. 40 points.
Answer:
can you like number them please? it would make it a lot easier
Explanation:
any____has____sets of physical and chemical properties
Arrange the elements in order of increasing atomic radlus. Use the periodic table
the table
to locate the position of the elements in
Drag each tile to the correct box.
Tiles
barium
calcium
Oxygen
selenium
Sequernce
Answer:
Oxygen, Selenium, Calcium, Barium.
Explanation:
for plato user :)
Answer: Screen shot
Explanation:
The recessive trait disappears in a genetic cross.
True
or
False
Answer:
True
Explanation:
Please help RN!! It’s due in 10 mins T^T I’ll give brainliest !!
Select the correct location on the image.
Which of these four elements is the most reactive metal?
Explanation:
the answer is rubidium
Answer:
the answer is Rb
Explanation:
i got it right
Help would be much appreciated, I'm being timed
I'll mark brainliest !!
What type of energy conversion is taking place inside a flashlight when it is on?
Answer:
electrical energy
When the flashlight is turned on, the chemical energy is first transformed into electrical energy and then into light energy. CHEMICAL bonds. It is released during a chemical reaction (change). by flowing electrons (negatively charged particles).
Answer:
Electrical Energy
Explanation:
When the flashlight is turned on, the chemical energy is first transformed into electrical energy and then into light energy. CHEMICAL bonds. It is released during a chemical reaction (change). by flowing electrons (negatively charged particles).
Protons + Neutrons =
Answer:
mass
Explanation:
convert 80kg into grams
Answer:
80000 grams
Explanation:
kilo means 1000
80 x 1000 = 80, 000
the properties of a compound are ____ the properties of the element that form it
is riding a bike potential energy or kinetic energy
Answer: Mechanical energy usually means the sum of the kinetic energy and potential energy. So when you ride your bike you hope that the muscular (chemical) energy is converted mainly into mechanical energy.
Explanation:
Answer:
Isn't it neither.
Explanation:Because potential is going up and kinetic is going down.
The density of iron is 7.6 grams per cubic centimeter. What volume would a 76-gram sample of iron fill? Density = Mass / Volumne
10 cm
1.0 cm
76 cm
O 7.6 cm
help me please i need help cuz its due today
Answer:
I believe the answer is a. I hope this helps
what is the balanced equation of K3PO4 + HCI -> KCI + H3PO4?
Answer:
K₃PO₄ + 3HCl ⇒ 3KCl + H₃PO₄
Explanation:
practice these, it gets easier. goal is to match the amount of reactants and products on both sides of the equation. cheers!
a Gardner crosses a plant with red flowers with one with white flowers. each plant is pure for its trait for flower color
if the gene for the flower color shows incomplete dominance what kind of coloring will the flower on the offspring plants most likely have
a. white and red
b. red only
c. pink only
d. white pink
Answer:
Pink only
Explanation:
AP3X
science stuff i got confused can someone pls help. PLS & THX
Answer:
A Scientific Law
Explanation:
'When a substance goes through a chemical change the amount of mass and matter cannot be created nor destroyed.' This a statement of The Law of Conservation of Mass. This Scientific Law is simply titled as a law because every time experimented, the results are predictable and is natural occurrence.
What happens yo temperature in your layer as u you go higher in altitude?
Answer:
Temperatures decrease with increasing height as the ozone layer is left behind and the air thins out with increasing altitude. The lowest portion of the low-pressure mesosphere is heated by the warm air of the upper stratosphere. This heat radiates upward, getting less intense as altitude increases.
Explanation:
Brainliest please?
The galaxy we live in is the Milky Way galaxy, and it is a spiral galaxy. Galaxies contains billions of which of the following?
A.Smaller galaxies
B.Black holes
C.Planets
D.Stars
Need help ASAP
Answer:
D. Stars is the correct answer
Please give my answer the brainliest...
What is specific heat? How are the factors affecting it?
Answer:
Specific heat, ratio of the quantity of heat required to raise the temperature of a body one degree to that required to raise the temperature of an equal mass of water one degree.
Explanation:
by dividing the heat capacity by the quantity of substance in a body, the resulting specific heat capacity is a function of the structure of the substance itself. In particular, it depends on the number of degrees of freedom that are available to the particles in the substance, each of which type of freedom allows substance particles to store thermal energy.
Question 2 (5 points)
Overproduction takes place when:
Organisms have to fight for resources.
Humans choose which organisms can reproduce
There are differences in 'organisms of the same species
Organisms have more offspring than can possible survive
a
Answer: D
Explanation: