After learning about chemical reactions, Jack investigated different kinds of chemical changes using substances he found in his kitchen so that he could see these changes. Which of the following will NOT occur when a chemical reaction takes place?

A.New bonds form.
B.Existing bonds break.
C.The same substance will have different properties.

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.

Please help me with this question

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

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.

Is there a relationship between cohesion and volume?

Help me out? thank you.

What does this illustration tell you about the History of the Periodic Table?
(Brainliest will be given!)

Which type of graph would best represent data from this experiment: What percentage of students at Lincoln Center Elementary like red, blue, green or yellow best? Question 3 options: A. Circle graph B. Bar graph C. Line graph

What is the charge for a nitrogen ion?

A) 3-

B) 1-

C) 2-

D) 2+

have more points because i dont care

Help! Quicklyyyy! Easy science thing.

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

PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!

scary storys anyone ?

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
.

Describe how an El Niño event affected weather, food production, water supply, or human health.

Please answer all these questions!!

Write a description that explains how the digestive, circulatory, and excretory systems WORK TOGETHER in order to deliver very important materials to the cells and dispose of waste products from the cells! Try to include as many details as possible - What is the blood carrying? Where is it going? How does it get there? What does it get rid of and how?

Answer please 10 points

which ones is right i need help

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

what makes a butterflyfish a chordate

\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

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

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?

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

A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight. As each paper clip was added, the plane was tested to determine how far it would fly.

What was the dependent (outcome) variable from this experiment?

The paper airplane design.


The number of paperclips.


The type of paper.


The distance the plane flies.

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!!!)

The diagram shows a simple model of an event that is part of the rock cycle. image Which type of event is most likely occurring in the diagram?

A. the compacting of layers by high pressure and heat that leads to metamorphic rock
B. the cementing of layers of sediment particles that leads to sedimentary rock
C. the melting of sediment particles that leads to igneous rock
D. the hardening of liquid magma that leads to igneous rock

Help me pleaseeee!! 10 points