Explain the energy changes that occur when the following reaction happens:
H2 + Cl2 → 2HCl

A. Energy is absorbed when the HCl bonds form.

B. Energy is needed to break the bonds of H-H in H2 and Cl-Cl in Cl2

C. Energy is released when the bonds of H-H in H2 and Cl-Cl in Cl2 break.

D. Energy is released when the H-Cl bonds form.

E. No energy changes occur when this reaction happens.

Answer:

B

Explanation:

H2 + Cl2 → 2HCl

Hmm redox reaction.

Energy is needed to break the bonds of H-H in H2 and Cl-Cl in Cl2

What are the three essential theories in Earth science?

Drag the tiles to the correct boxes to complete the pairs.
Match the inheritance patterns with the scenarios that exemplify them.

codominance
multiple alleles
incomplete dominance

A pink roses are formed when red roses are mated with white roses.
arrow -

Genes with the alleles IA, IB, and i are responsible
for expression of A, B, and O blood types.
arrow -

A red flower and a white flower produce
an offspring with equal proportions of red
and white coloration.
arrow -

Would the following atoms have similar reactivity?

A) Elements in Group 2 have 2 energy levels.

B) Elements in Period 7 have 7 valence electrons.

C) Elements in Group 13 have 13 valence electrons.

D) Elements in Group 13 have 13 valence electrons.

meiosis amp biology lab​

Are there any steps of the rock cycle that do NOT connect directly to one another? Explain why this may be the case using at least two examples.

please helpp

The moon will always be new when a ____ eclipse happens. During a lunar eclipse, the moon will be ____.

a
lunar, new
b
lunar, full
c
solar new
d
solar, full

Which best describes sodium chloride (NaCl)?
A. a mixture which is physically produced
B. a mixture which is chemically produced
C. a compound which is physically produced
D. a compound which is chemically produced

What makes the Oxygen Family unique?

If there was no sunlight, would there be more or less carbon in biotic matter?

Where does most fresh water exist?

Identify two characteristics shared among transverse waves, longitudinal waves, and surface waves.

Please help me out with this question if you help me I will give you the brain thing and extra points. 2/9 image below.

Someone please help me if right I’ll give you 5$

DONT ANSWER I FOUND IT ALREADY
Which best describes the purpose of the ice in this experiment?


A. The ice melts into the flask causing a cloud to form.

B. The ice cools the air around the flask, causing a cloud to form in the flask.

C. The ice is used to hold the water in the flask so that it can't escape.

D. The ice causes the water vapor in the air above the warm water to change, forming a cloud.

Frank has an eraser It has a mass of 4g and a volume of 2ml What is its density hint Density equals mass and volume

A student wants to determine the effect of mass on kinetic energy. She will drop two balls of the same size into a pool of water. Which investigation method should the student use?(1 point)

a. She should drop two balls of the same mass from different Hights.
b.she should drop two balls with different masses from the same Hights
c.she should drop two balls with different masses from different Hights
d.she should drop two balls of the same mass from the same Hights

what is this stone called? and false answers will be deleted. please help, i am making a pendulum

Which of the following points is/are true for plasma?
(1) It is a very good conductor of electricity.
(2) Gas is transformed into plasma state.
(3) It is influenced by magnetic and electric fields.
(4) All of the choices

In an electrical wire, if instead of copper, plastic wire is used. Would it conduct electricity?Justify your answer.

Why do some animals die off while other similar animals survive in the same environment?

Animals respond to threats in their environment by attacking or escaping. Either response is the result, mostly, of interactions between -

Fill in the blanks:
An ___________ measures wind speed and a _________ shows wind direction.

A.weather balloon; electroscope

B.anemometer; wind vane

C.flask; beaker

D.oscilloscope; seismograph

It's science btw

Which of the following statements fully describes what an object may do when it experiences unbalanced forces? Select the two best answers.

A. It may change directions.

B. It will move at a constant speed.

C. It may slow down.

D. It may slow down or speed up.

E. It will stay stationary.

PLEASE ANSWER QUICKLY!!!!! Which of the following is NOT a function of your integumentary system?

A) Protecting against infection
B) Synthesizing vitamin D
C) Maintaining Fluid Balance
D) Stabilizing blood pressure

Which statement describes the role of consumers in an ecosystem?

A.
Consumers make their own food.

B.
Consumers eat only decomposers.

C.
Consumers provide food for producers.

D.
Consumers provide food for other consumers.

please help me 7th grade science

When a chemical reaction occurs, what happens to the atoms of the two substances? Provide an example from the Sim (on Amplify) as evidence to support your answer.

When a chemical reaction does not occur, what happens to the atoms of the two substances? Provide an example from Sim as evidence to support your answer.

I need help quickly, this assignment is due in a few hours. I have a few 8th grade science questions I need help with. These is not need to explain your answer, just tell me if the answer is a,b, or c. Also, please answer all of the questions listed not just some of them. I will be giving 20 points if you answer, and brainly to the first person to answer. The questions look really complicated but it is mainly just a long description. The questions themselves seem simple.

QUESTION ONE : Miranda was learning to bake bread at home. Her first few batches of dough did not rise, or expand, as much as they should have. Miranda's mother noted that the kitchen was cold and suggested that the dough might not be warm enough to rise. Miranda decided to test her mother's suggestion. She made a large batch of dough and divided it into six equal-sized balls. Then, she put each ball into a bowl. She left three bowls on the counter in the kitchen, where the temperature was 63oF. She left the other three bowls on her desk in her upstairs bedroom, where the temperature was 80F. After one hour, Miranda measured the size of each dough ball.

Which of the following was the dependent variable in the experiment?
a. the temperature where the dough was left to rise
b. the ingredients used to make the dough
c. the size of each dough ball

QUESTION TWO: Jada liked to make guacamole, but she could often find only unripe avocados at the grocery store. In biology class, Jada learned that ripe fruits produce a gas called ethylene that can cause other fruits to ripen. Jada wondered whether storing ripe bananas with unripe avocados would make the avocados ripen faster. Jada prepared four paper bags with five unripe avocados in each bag. She added on ripe banana to two of the bags. Then, Jada sealed all four bags. After three days, she opened each bag and counted the number of ripe avocados in each bag.

Which of the following was the independent variable in this experiment?
a. the type of paper bag used
b. the number of bags with a ripe banana
c. the number of ripe avocados

QUESTION THREE: Colette was using steel to make rusted sculptures. After building each sculpture, she caused the steel in the sculpture to rust by placing it into tub filled with salt water for eight hours. Colette wondered if steel would rust faster submerged in vinegar instead of salt water. To find out, Colette cut ten squares of steel sheet metal and split them into two equal groups. She put one group of squares into a tub filled with salt water and the other group of squares into a tub filled with vinegar. Once an hour for eight hours, Colette counted the number of rusted steel squares in each group.

Which of the following was a variable that was held constant (control variable) in this experiment?
a. the type of liquid used
b. the size of the squares of steel sheet metal
c. the number of rusted steel squares

QUESTION FOUR: David divided 40 unripe bananas evenly among eight paper bags and sealed the bags. He poked 20 small holes in four of the bags and left the other four without holes. He kept the bags at room temperature for three days. Then, David opened the bags and counted the number of brown spots on each banana. He compared the average number of brown spots on bananas from bags with holes to the average number of brown spots on bananas from bags without holes.

Identify the question that David's experiment can best answer.
a. Do bananas develop more brown spots when they are kept at room temperature compared to in a cold refrigerator?
b. Do bananas develop more brown spots if they are kept in bags with holes compared to bags without holes?
c. Do bananas develop more brown spots when they are kept in brown paper bags compared to in a plastic bag?

QUESTION FIVE: Ten groups of chemistry students combined three solutions that, when mixed, chemically reacted and turned blue. Before mixing, five groups of students heated the solutions to 25C, and five other groups heated the solutions to 50C. The students recorded how many seconds it took for the mixtures to turn blue. Then, the groups shared their results, and the class compared the time it took for the mixtures to turn blue at 25C and at 50C.

Identify the question that the students' experiment can best answer.
a. Does the type of color the mixture produces depend on the temperature of the solutions?
b. Does the mixture of solutions release more gas when they are mixed at 25C compared to 50C?
c. Does the mixture's color change faster when the solutions are mixed at 25C or 50C?

(1.) If at 100.0 mL solution contains 0.850 moles of a solute, what is the molarity ?
(2.) If the molarity of a solution is 12 M and the volume of the solution is 1.0 L, how many moles of solute does the solution contain ?

List examples of organisms from the movie that represent each of the six kingdoms. Monera (Archaebacteria/Eubacteria): Protista: Fungi: Plantae: Animalia

The forces from below the surface that change the surface of the earth are

Erosion
Earthquakes
Volcanoes
Living things
Weathering
Faulting
Folding
Glaciers