Chemistry Middle School

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.

Answers

Answer 1
I think D, not sure though!
Answer 2
Ur answer is d elements is group 13 have 13 valence electrons

Related Questions

How many more oxygen atoms are in Na2HPO4H(disodium phosphate) then in 2H3PO(Phosphoric Acid)?

Answers

Answer:

in disodium phosphate = 4 oxygen atoms

in phosphoric acid = 1 oxygen atom

Answer: There are 3 more oxygen atoms in Na2HPO4H than 2H3PO

Explanation:

There are 4 oxygen atoms in Na2HPO4H and 1 in 2H3PO. You subtract 4 - 1 =3

What kinds of changes happen to water as it goes through the water cycle? Are they physical or chemical?

Answers

Answer:

When water changes state in the water cycle, the total number of water particles remains the same. The changes of state include melting, sublimation, evaporation, freezing, condensation, and deposition. All changes of state involve the transfer of energy.

Explanation:

and its physical

Answer:

The answer is Physical

Explanation:

The changes of state include melting, sublimation, evaporation, freezing, condensation, and deposition. All changes of state involve the transfer of energy. They are all the same but no matter what state it's in it's still water so it's physical.

which one should I go in ??????

Answers

Answer:

the hatchery I think

Explanation:

because i think

A period of inactivity in a plant, where it does not grow to survive unfavorable environmental condidtions

Answers

Answer:

Dormancy

Explanation:

dormancy is the correct answer

A ______________________is a group of stars that has been given a name to help us find certain stars or recognize them

a
cluster
b
gaggle
c
constellation
d
flock

Answers

Answer:

It is c

Explanation:

Because a constellation is a group of stars with names

Answer is c because it just is

What are the 3 most important ecosystem services of a coral reef
1: Home to housands of species of fish, plants, and turtles

2: Corals provide treatments to human illnesses.

3: Reduces wave energy and helps protect against tsunamis

4: Heats up the planet.

5: Provides a good source of tacos.

Answers

2 Corsls provide treatments
1. Home to thousands of species of fish plants and turtles
2. Corals provide treatments to human illnesses
3. Reduces wave energy and helps protect against tsunamis
The other two answers aren’t true and don’t make sense

Gravitational potential energy is energy due to


being in motion


being on the ground


height above ground


doing work

Answers

Answer:

being on the ground

Explanation:

Answer:

Gravitational potential energy in terms of work done against gravity. ... We define this to be the gravitational potential energy (PEg) put into (or ... Figure 2. The change in gravitational potential energy (ΔPEg) between points A and B

Explanation:

hope this helps

Infer How do you think these bones are involved in a whale’s movement?

Answers

I think that the bones involved in a whales movement help there tail move so they can swim
By keeping the muscle from flailing around and add support and stability when it moves its body,

How does the equation below support the idea that matter is not created or destoryed?

6H2O + 6CO2 -----> C6H12O6+ 6O2

Answers

Answer:

the numbers all stay the same, just distributed

Explanation:

theres still only 6 c. 12 h. and the same amount o

Answer:

its us air

Explanation:

bc u said ha

Which three temperature readings all mean the same thing?


273 Kelvin, 100 degrees Celsius, 212 degrees Fahrenheit

100 Kelvin, 0 degrees Celsius, 32 degrees Fahrenheit

273 Kelvin, 0 degrees Celsius, 212 degrees Fahrenheit

373 Kelvin, 100 degrees Celsius, 212 degrees Fahrenheit

Someone please help!

Answers

The last one is correct :)

Answer:

273 Kelvin, 0 degrees Celsius, 32 degrees Fahrenheit

Explanation:

European and North America coal fields line up.
A.true
B.false

Answers

Answer:

The Answer Is A

Explanation:

plz help .....................

Answers

Answer:

1. conduction

2. radiation

3.convection

4. conduction?

5. radiation

6. convection

7. convection

8. convection

9. radiation

10.radiation

(sorry if they aren't all correct)

What flows directly into the ocean? *
A. Glaciers, heat, and water
B. Glaciers, Rivers, and Groundwater
C. Glaciers, sewers, and helium
D. None of the above

Answers

the answer is A. (glaciers, heat and water)
The person above is right :)

Fossils of tropical plants have been found in extremely cold regions.
A.true
B.false

Answers

false because they would freeeze
I think false it would have been gone by doing that

What kind of change, physical or chemical, is happening when wood burns? How can you tell?

Answers

Answer:

Wood changes chemically to carbon dioxide when it burns and leaves a residue of ashes. These ashes cannot be changed back to wood. So it is a chemical change.

chemical
physical means it can go back to its shape; chemical it cannot.
for example when wood burns you can’t get that wood back to before it was burned!

hope this helps!

Plz HELP ITS SCIENCE!

Answers

Cell wall:
-acts like a skin
- most selectively controls what is inside and outside of the cell
-rigid

Cell membrane:
-gives a plant cell
-not rigid
Cell Wall
1) Acts like skin.
2) Rigid.
3)Gives the plant cell its shape.



Cell Membrane
1) is not rigid.
2) More selectively controls what goes in and out of the cell.

Which of the water alternative energy source has an energy transfer chain of GPE-->KE-->EE?

Answers

Um what’s the question?
Elastic Potential Energy. Uses Gravitational potential energy, kinetic energy and EE.

In your words, explain why water is higher salinity is denser than water with a lower salinity?

Answers

Because it matters on how much salt dissolves, which when there’s more salt there’s more salinity. When comparing 2 cups of water, the waiter with higher salinity has more mass so it’d be more dense!

The formation of hurricanes, cyclones, and typhoons
A.true
B.false

Answers

True homie Bc I said it was
I say true aswell cause it makes sense

Which of the following compounds contains twice as many carbon atoms as oxygen atoms?
Plz help :)

Answers

Answer 2 =C2 H6 O11 i hope that help

Need help with 7th grade science
Help ASAP
What are some of the raw materials that are used in making T-shirts. (Except cotton)
Raw materials: a material that is made by/in nature/earth. Example mine materials, nature materials (tree/grass)

Answers

Answer:

Cotton, polyester, and pima

Explanation:

T-shirts are generally made of a stretchy, light and inexpensive fabric and are easy to clean. Typically made of cotton textile in a stockinette or jersey knit, it has a distinctively pliable texture compared to shirts made of woven cloth.

can someone make me a lab report? Please......... Objective(s): In your own words, what was the purpose of this lab? Hypothesis: In this section, include the if/then statements for your lab. These statements reflect your predicted outcomes for the experiment. Procedure: In your own words, summarize the steps you took to complete your lab. Data: Data tables and graphs should be included in this section. Conclusion: Your conclusion will include a summary and an interpretation of the data results.

Answers

Answer:

When i used baking soda and water whith hydro-oxide it made elephant -toothpaste

Explanation:

hope this helped!

How many different elements are involved in the reaction shown? Record the answer in the grid. Plz help :))

Answers

Ca=Calcium

Ci=Iron

Ag= Silver

No-Nobelium

help now NOW NOW NNNOOOWWW, please

Answers

The answer is c i now this stuff

plz help me on the other two :) i already did the third one

Answers

Energy is lost because only a certain amount of energy is transferred through each trophic level
As you more up to the top of energy pyramids , energy is lost due to things such as excretion

Please answer
Which describes sand?

fine-grained
retains water
water drains quickly
good for growing crops


-KUBAN

Answers

Answer:

c

Explanation:

A student made peanut butter bars by pressing a layer of graham cracker crumbs into a baking pan. Next, the student added a layer of a peanut butter mixture and then added a layer of crushed peanuts. Lastly, the student added a layer of chocolate frosting.

The process of making peanut butter bars is most like the formation of what type of rock?

Igneous

Metamorphic

Sedimentary

Magma

Answers

Answer:

i am pretty shure it is c soooo sorry if i wroung

Explanation:

It’s sedimentary, which is formed by compressing layers of sediment.

Igneous comes from volcanoes
Metamorphic start as one kind of rock, then change to another
Magma is like igneous

Choose all the answers that apply.

Conduction _____.

is the transfer of heat in fluids
requires physical contact between molecules
is the transfer of heat in solids
happens because molecules cause each other to vibrate

Answers

happens because molecules cause eachother to vibrate
happens because molecules cause each other to vibrate

Land bridges across oceans are used to connect all continents on earth.
A.true
B.false

Answers

Answer:

"A. True", is the right answer.

I’m going with him I believe it’s true

The edges of South America and Africa seem to fit together like a puzzle.
A.true
B.false

Answers

Answer: true

Explanation:

Answer:

It's true...

Explanation:

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