How many atoms of Pb are there?

Answer:

There are 2 atoms of Pb.

Explanation:

There are 2 atoms of Pb, 8 atoms of Br.

Answer:

2

Explanation:

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How do the gases in Earth's atmosphere affect Earth's average temperature?
A. They make Earth warmer by trapping heat energy in the bonds between their atoms.
B. They make Earth warmer by allowing all of the Sun's rays to travel to Earth's surface.
C. They make Earth cooler by decreasing the amount of precipitation formed in the atmosphere.
D. They make Earth cooler by allowing most of the heat from the Sun to escape back into space

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Please help if you can.

Diagrams A-D show the sequence of changes in a pond.



1. Look at each stage of ecological succession. Describe your observations for each stage.

a)

b)

c)

d)



2. Based on your observations, what is the sequence of steps in the illustrated ecological sequence?



3. Predict what will happen to the pond.

PLEASE HELP!!!!!!
Describe the relationship between the three processes important to sedimentary rock formation: deposition, compaction and cementation.


and



How do you think the formation of fossils in sedimentary rock disrupts or alters the process of sedimentary rock formation? In other words, how does the formation of a fossil fit into the process of sedimentary rock formation? Defend your answer.

Which of the following are isotopes?
Two carbon atoms, one with 6 electrons and one with only 5 electrons.
Two oxygen atoms, one with 6 neutrons and one with 5 neutrons
Two nitrogen atoms, both with 7 protons and 7 neutrons
An oxygen atom with 6 neutrons and a nitrogen atom with 6 neutrons

CORRECT ANSWER GETS BRAINLIEST!!!!!!!!!!!!

Earth’s atmosphere contains the element oxygen in two different forms. The chemical formula for oxygen gas is O2. The chemical formula for ozone gas is O3. How does the structure of oxygen gas differ from that of ozone?

i need and explanation and i need it today. i will give brainliest

ANALYZE IT
1. What is a nebula?


2. What effect might a supernova have had on the material in a nebula that led to the creation of our solar system?

3. Does nuclear fusion combine or break apart hydrogen (H) atoms to form helium (He) atoms? Does nuclear fusion release or
absorb energy?


4. What percentage of the matter in the solar system does the sun contain? What does that statistic tell you about our sun?

5. What role did gravity play in the formation of the solar system?

Ok me and my brother had an argument and threw a frok at me
Saying he didnt

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

Water has a formula of H2O. Based on the formula which is NOT a correct statement?

A. It is an element

B. It is a compound

C. It contains oxygen

D. It contains hydrogen

How do liquid water, ice, and water vapor differ from each other?
1- They are different kinds of particles in the same states of matter.
2- They are the same kind of particles in different states of matter.
3- They are different substances in different states of matter.
4- They are the same substances in the same state of matter.

The atoms in the diagram above are...

sharing pairs of valence electrons.

losing valence electrons.

transferring valence electrons.

pooling valence electrons.

What is the rock’s velocity when it reaches the bottom? How do you know?

1. write a sentence that describes how the food changes in the stomach.

2. write a sentence that describes how the food changes in the small intestine.

3. explain what happens to digested food in the small intestine

4. write a sentence that describes what happens to digested food in the cell.

Name the particle that has each type of charge?

Positive (+) _________________________________________________
Negative (-) _________________________________________________
No Charge (0) _________________________________________________

Help plz, thx
Are ice caps in Greenland are composed of salt water?
Yes or no, and plz explain why.

What’s the correct name for N2O5
A.Dinitrogen Pentoxide
B.Nitrogen Pentoxide
C.Nitrogen Oxide
D.Pentnitrogen Dioxide

I NEED THIS ASAP ILL GIVE BRAINLIEST

Color is everywhere in nature. The arrows in the image model the wavelengths of visible light. Compare how the incoming colors of light behave when they encounter the kittens black fur, it’s white fur, the green grass, and the yellow dandelion

(OMG PLEASE HELP ASAP!!:c)What is the major function of proteins in cells?

1.They contain the instructions for the cell to carry out all the functions of life

2.They provide components of cell membranes and organelles and speed up chemical reactions

3.They provide energy and components of cell walls and cell membranes They provide energy and components of cell walls and cell membranes

4.They store energy and provide certain components of cell membranes

Balance this equation: CH4 +2O2--------> ___ CO2 + ___ H2O
a-1 CO2 + 1H2O
b-1 CO2+ 2H2O
c-2 CO2 + 1H2O
d-2CO2 + 2H2O

After Michelle went on vacation for two weeks, she came home to find her potted plants had turned brown and died. The soil was very dry. While Michelle was away, she kept the curtains and windows closed and did not have a neighbor come by to water her plants. Michelle now realizes that she will have to do things differently the next time she is away for several days if she wants to keep her plants alive. Why is it important for Michelle to make sure her plants have their needs meet while she is away?

A.
She needs to make sure the plant receives water, sunlight, and air. Plants need all components to make their own food.

B.
She needs to be sure to put plant food in the pot. Plants need to be feed because they do not make their own food.

C.
She needs to add a lot of water to the pot before leaving. Plants only need moist soil to make their own food.

D.
She needs to keep the curtains open or set the plant outside. Plants only need sunlight to make their own food.

Which of the following best explains the motion of the box on the table? Image result for image box on a table

A.The box is moving downward because of the force called gravity.
B.The box is moving upward because of the force called gravity.
C.The box is not moving because the table is pushing it upward more than gravity is pulling it downward.
D.The box is not moving because the table is pushing it upward just as much as gravity is pulling it downward

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____ is the study of a reactions progress over a period of time.

Explain how frequency and wavelength are related to the speed of a wave.

Nitrogen has five valence electrons. For this reason, it often bonds to gain three electrons. Based on the arrangement of the elements in the periodic table, which other element most likely shows similar behavior ?

Select one :

A || carbon

B || oxygen

C || phosphorus

D || neon

How can an induced magnet be made stronger?
adding more secondary coils
adding more primary coils
adding more induction