The first step in the disintegration of uranium is 238U →234Th+ ? . What particle is emitted in this reaction?

Your answer:
alpha
beta
gamma

An alpha decay is "a type of radioactive disintegration in which some unstable atomic nuclei dissipate excess energy by spontaneously ejecting an alpha particle".

Radioactive disintegration is "the process by which an unstable atomic nucleus loses energy by radiation".

An atomic nucleus is "the small, dense region consisting of protons and neutrons at the centre of an atom".

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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In a __________________ reaction, elements are not changed, just rearranged. Small amounts of energy take place.
a. Endothermic
b. Exothermic
c. Nuclear
d. Chemical

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?

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

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

When an apple falls from a tree, when does gravity act on the apple?

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 please 10 points

Is there a relationship between cohesion and volume?

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 these is not considered a pure substance?
An atom
A mixture
An element
A compound

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

\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

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!!!)

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
.

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.

scary storys anyone ?

When Magnesium loses electrons to Oxygen and they form an Ionic bond.
Synthesis
Combustion
Decomposition
Redox

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?

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.

If you compare a long wavelength with a short wavelength, which one should have a higher frequency? Why?

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

Help me pleaseeee!! 10 points

Please help me out with this stuff please

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

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

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!!!!

What would happen if a cell membrane let too much water into a cell?

What is the charge for a nitrogen ion?

A) 3-

B) 1-

C) 2-

D) 2+

have more points because i dont care