An alpha decay is "a type of radioactive disintegration in which some unstable atomic nuclei dissipate excess energy by spontaneously ejecting an alpha particle".
What is radioactive disintegration?Radioactive disintegration is "the process by which an unstable atomic nucleus loses energy by radiation".
What is an atomic nucleus?An atomic nucleus is "the small, dense region consisting of protons and neutrons at the centre of an atom".
What is an alpha-particle?An α-particle is "a helium nucleus. It contains 2 protons and 2 neutrons, for a mass number of 4".
238U → 234Th+4He
Hence, an alpha particle is emitted in this reaction.
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scary storys anyone ?
Answer:
Me i love scary stories
Explanation:
Anyways can u give u give me brainlist (or however u spell it)
PLEASE HELP!!!!!!!!!!!!!!!!!!!!!! DUE TOMORROW 40 POINTS!!!!!!!!!!!!!!!!!!
Elements in the same period are similar in that
same number of valence electrons of same number of energy shells
Answer: I believe this is the answer: The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.
Good luck on assignment! :)
Answer: The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements. Every element in the first column (group one) has one electron in its outer shell.
Explanation: :)
When Magnesium loses electrons to Oxygen and they form an Ionic bond.
Synthesis
Combustion
Decomposition
Redox
Answer:
Redox
Explanation:
Worksheet: Balancing Equations
I. Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical reaction. ________________ are the starting substances in the reaction while ________________ are the new substances that are formed. The large numbers in front of some of the formulas are called ________________. These numbers are used to ________________ the equation because chemical reactions must obey the Law of ________________ of Matter. The number of atoms of each element on both sides of the equation must be ________________ because matter
cannot be ________________ or ________________. When balancing equations, the only numbers that can be changed are ________________; remember that ________________ must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3
2. C3H8 + O2 CO2 + H2O
3. P4 + O2 P2O3
4. KNO3 KNO2 + O2
5. O2 + CS2 CO2 + SO2
6. KClO3 KCl + O2
7. N2 + H2 NH3
8. NaF + Br2 NaBr + F2
9. Al + HCl H +AlCl3
10. WO3 + H2 W + H2O
Answer:
1. Chemical Equation 2. Reactants 3. Products 4. Coefficients 5. Balance 6. Conservation 7. Equal 8. Created 9. Destroyed 10. Coefficients 11. Subscripts
Explanation:
A balanced equation obeys the law of conservation of mass. The mass of the reactants and products are equal on both sides of the equation.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The numbers which are used to balance the chemical equation are called the coefficients.
The coefficients are the numbers which are added in front of the formulas. According to law of conservation of mass, the mass can neither be created nor be destroyed. It can be transformed from one form to another.
In other words, the mass and charge are balanced on both sides of the reaction.
The balanced equation for the reaction is:
4Al (s) + 3O₂ (g) → 2Al₂O₃ (s)
Here the number of 'Al' and 'O' atoms are balanced.
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Which of the following would most likely form an ionic bond?
A) Br and Cl
B) O and Cl
C) H and Cl
D) Na and Cl
Which of the following is an example of chemical energy?
a hot metal pan
an apple
turning on the TV
a roller coaster rolling down
HELP PLZ
Answer:
turning the tv
Explanation:
this is my third time asking this,,, HELPPPPPP PLZZZz i'll mark brainliest! Infrared (IR) and ultraviolet (UV) light. But above 29°C, the coating on the glass undergoes a chemical change, causing it to block IR light. What happens to the IR light?
Answer:it would not cause any effect because its blocking it. Basically u could say that what would happen is that no effect was happening cuz of the blocking.
Explanation:
have more points because i dont care
Answer:
????
Explanation:
Answer:KK thanks
Explanation:fun fact:greeks loved gays like anyone who was gay recieved so much help from the government that being gay in ancient greece was so common
If you compare a long wavelength with a short wavelength, which one should have a higher frequency? Why?
What is the difference between a chemical change and a physical change?
A. A physical change forms a new substance with different properties. While in a chemical change, the materials remain the same.
B. A chemical change forms a new substance with different properties. While in a physical change, the molecules remain the same.
C. A chemical change forms a different shape, such as by bending, folding, or melting, but does not form a new substance with different properties.
Answer:
A
Explanation:
because chemical change is permanet.
Match the vocabulary word to the definition. Question 1 options:
not easily changed?
A. an attraction between two or more atoms resulting in the formation of different chemical substances?
B. A chemical bond that involves sharing a pair of electrons between atoms in a molecule?
C. electrons in the outermost shell?
D. Formed when one or more electrons are transferred from one atom to another?
1. stable 2. chemical bonding 3. valence electrons 4. ionic bond 5. covalent bond
Answer:
a
Explanation:
Which option correctly identifies the pure substance or substances? a. diamond b. salt
A. a
B. a and b
C. b and c
D. all of them
I think the correct answers are A and B
In guinea pigs, black fur is the dominant trait. If a white guinea pig mates with a guinea pig that is heterozygous for its black fur, which combination of offspring best represents the likely outcome from the cross?
A.
19 black fur, 1 white fur
B.
1 black fur, 20 white fur
C.
16 black fur, 4 white fur
D.
11 black fur, 9 white fur
PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Mrs. Hernandez brought her pet bird to school one day to find out what her students understood about forces. As the bird rested on a perch, Mrs. Hernandez asked her students to describe any forces acting on the bird. This is what some of her students said:
Bob: The only force acting on the bird is gravity.
Chelle: The only force acting on the bird is air pressure.
Fred: There are no forces acting on the bird because the perch stops any forces from acting on it.
Omar: There are many forces acting on the bird. The bird is held in place by the force of the branch.
Katrina: The force of gravity pulls down on the bird while the branch pushes up to support the bird.
Which student do you most agree with?
Explain your thinking. What reasoning did you use to decide what forces were acting on the bird? (WILL GIVE BRAINLIEST!!!)
Please help me out with this stuff please
Answer:
You have to do some of these yourself we cant do all the pages. You have to make sure to extend your knowledge :)
Explanation:
Help me pleaseeee!! 10 points
Answer:
C: malleability
Explanation:
Think of something being malleable as also being moldable
Answer:
*Malleability*
Explanation:
Which of these is not considered a pure substance?
An atom
A mixture
An element
A compound
Answer:
A mixture is not a pure substance.
Is there a relationship between cohesion and volume?
What is the charge for a nitrogen ion?
A) 3-
B) 1-
C) 2-
D) 2+
In a __________________ reaction, elements are not changed, just rearranged. Small amounts of energy take place.
a. Endothermic
b. Exothermic
c. Nuclear
d. Chemical
PLS HELP
Fill in the word that completes each sentence.
In the mitochondrion, small molecules combine with
to produce
and carbon dioxide.
This process releases a large amount of
.
PLEASE HELPP
A student fills four containers with 20 ml of water and places them in four different locations.
One is placed in a sunny window, one is placed underneath a heat lamp, one is placed on a
student desk, and another is placed in a dark cabinet. The student plans to collect evaporation
data over a period of one week. Which prediction will best match the actual results?
Answer:
a heat lamp
Explanation:
Answer:
The one under the heat lamp is most effective
Explanation:
The heat is making the water warm and will soon evaporate
Answer please 10 points
Answer:
water
Explanation:
Answer:
Water
Explanation:
Most of the Earth is covered with water, so water is the substance.(H20)
Write a summary of some key ideas about chemical reactions.
Please!
I have to pass science to be able to get my nails done professionally!!!
I WILL MARK BRAINLIEST!!!!
Answer:
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Reactants are the starting materials, while products are the end result of the reaction. All chemical reactions are accompanied by a change in entropy.
In general, chemical reactions can be classified as either redox reactions or non-redox reactions. In redox reactions, there is a transfer of electrons between reactants. In non-redox reactions, there is no electron transfer. All exothermic reactions are redox reactions, while endothermic reactions may be either redox or non-redox.
Explanation:
Hope this helps!
\Which type of graph would best represent data from this experiment: Which sport is most popular? Question 2 options:
A. Bar graph
B. Circle graph
C. Line graph
Answer:
bar graph and line graph
When an apple falls from a tree, when does gravity act on the apple?
What would happen if a cell membrane let too much water into a cell?
Answer:
Animal Cell
When water moves into an animal cell (e.g. a red blood cell), the cell membrane stretches and the cell gets bigger. If this continues, the cell membrane will burst – this is called lysis.Plant Cell
When too much water moves out of a plant cell the cell contents shrink. This pulls the cell membrane away from the cell wall. A plasmolyzed cell is unlikely to survive.Quickly answer please I’ll give you 25 points
Which event would most likely lead to a thunderstorm?
A. A warm, dry air mass moving over a cold air mass
B. A cold, dry air mass moving over a warm air mass
C. A cold, moist air mass moving over a warm air mass
D. A warm, moist air mass moving over a cold air mass
Answer:
A. A warm, dry air mass moving over a cold air mass
Explanation:
1. Which of these statements best describes the Earth’s crust?
A. It includes the continents but not the ocean floor.
B. It is a layer of molten rock that moves in circular patterns.
C. It is a system of large masses called tectonic plates that slowly move together or apart.
D. It is a layer of solid rock that remains the same throughout time.
Answer:
D) It is a layer of solid rock that remains the same throughout time.
Explanation:
I think it is, i might be wrong ..