Chemistry Middle School

Answer please 10 points

Answers

Answer 1

Answer:

water

Explanation:

Answer 2

Answer:

Water

Explanation:

Most of the Earth is covered with water, so water is the substance.(H20)

Related Questions

at least two examples
of Chemical Formula

Answers

Explanation:

Rotting, withering, heat and light emission, precipitate formation, gas evolution, or a change of appearance.

Answer:

h20 (water duh)

C9H13N (Amphetamine)

C6h1206 (glucose)

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

Answers

Gravitation Potential energy is converted into the Kinetic Energy, when it just reaches the ground. Some amount of energy is wasted in sound and heat energy when it strikes the ground. When the apple falls from the tree, it has some gravitational potential energy due to its height.

it has potential energy once it drops from the tree and a gravitational pull

The Dust Bowl was a time In the 1930s when prairie states in the Midwest had farmlands torn apart by wind erosion and storms. This disaster caused food shortages and financial hardship. What practice is most helpful to prevent another similar tragedy?

A. no-till farming to allow roots to hold soil together
B. over watering of fields to keep soil wet
C. terrace farming by putting walls up on hills
D. agricultural reform to change the types of crops planted

Answers

D. I might be wrong but I learned this a while ago

Answer:

Explanation: The dust bowl killed many crops resulting to low nutrients

How should Point 2 on the Land Breeze diagram be labeled?
a
Cool air, high pressure
b
Cool air, low pressure
c
Warm air, high pressure
d
Warm air, low pressure

Answers

B because when it so cold it gose up and then they is no perssure

Answer please 10 points science queasy

Answers

Answer:

Look up cumulonimbus clouds it looks like b

I believe the answer would be B. Cumulonimbus looks mostly like that.

Why do you think the Na+ ion is smaller than a neutral Na atom? Why do you think the Cl - ion is larger than a neutral Cl atom?

Answers

Answer:

Na+ ion is smaller than a neutral Na atom in the ion there was one more proton which will attract electron bring it closer to the center making the atomic radius smaller. Therefore making a Na+ ion is smaller than a neutral Na atom Explanation:

yes

Melvin is exploring the different kinds of changes that can happen to substances. After reading about the kinds of changes that occur, he saw some rust on a pipe that was going into his house. What kind of change is the formation of rust?

A.reactant
B.physical
C.chemical

Answers

Answer:

It is B. physical.

Explanation:

The rust on the pipe is something causes by something, which mean it is physical. Hope this helped you out!!

Have a wonderful day! :D

I think it’s c because when ever it rains it make medal rust

Help! Quicklyyyy! Easy science thing.

Answers

Answer:

A year too late..

Explanation:

the atomic number of an element is the number of ______ plus the number of _____ found in the element's nucleus.

Answers

Answer:

protons and electrons

Explanation:

The symbol for an atom can be written to show its mass number at the top, and its atomic number at the bottom. To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number: number of protons = atomic number. number of electrons = atomic number.

1. Protons 2. Neutrons?

Help me with this please! Do not say "I don't know" to get my points!!!!!!! It is not helpful and disrespectful. THANKS!

Answers

no- and na- nano5

na- and na+ nana2

hope this helps

Explanation:

Is there a relationship between cohesion and volume?

Answers

Cohesion is the attraction of water molecules to stick to each other, technically there would be a relation to cohesion and volume because the more the water droplets come together the more volume there is. But, volume is how much space a substance occupies so the actual definition of the two words is different.

Why does the Earth spin faster at the equator than the poles?

a
Due to the temperature differences on Earth, the land/sea near the equator goes at a faster rate. The Earth spins faster there only during the summer months.
b
The Earth is much wider at the equator than at the poles. It must cover a larger distance in the same amount of time (24 hours).
c
Due to the tilt of the Earth on its axis, the equator gets more sunlight -- therefore making it spin faster.

Answers

Answer:

Specifically, Earth rotates faster at the Equator than it does at the poles. Earth is wider at the Equator, so to make a rotation in one 24-hour period, equatorial regions race nearly 1,600 kilometers (1,000 miles) per hour. Near the poles, Earth rotates at a sluggish 0.00008 kilometers (0.00005 miles) per hour.

What reaction type is MgCl2 ---> Mg + Cl2 ?
a. Synthesis
b. Single Replacement
c. Double Replacement
d. Decomposition

Answers

Answer:

A.Synthesis

Explanation:

What reaction type is MgCl2 ---> Mg + Cl2 ?

a. Synthesis

b. Single Replacement

c. Double Replacement

d. Decomposition

Answer

A. Synthesis.

A sorry if I’m wrong

can you please help. I don't know how to do it.

Answers

The area used to be covered by an ocean

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

Answers

D. Chemical.
In a chemical reaction, elements are not changed, just rearranged. Small amounts of energy take place.

Please help me with this question

Answers

Answer:

Explanation:

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