CHEMISTRY MIDDLE SCHOOL

the first astronauts to travel to distant stars might use what to get up to light speed instead of engines

Answers

Answer 1
Answer: they would use light to get to light speed

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PLZ HELP AND ILL GIVE YOU BRAINLIEST!!!Match each molecular formula to the corresponding empirical formula.1) C4H8O2 2) C4H12O4 3) C2H10O2 A) CH3OB) CH5OC) C2H4O
What is answer and why
How old is the earth?
Give an example of how satellites are used for communication?
Marfan syndrome is a genetic disorder caused by a dominant allele.describe how marfan syndrome is inherited

Things that attract people to a new place are called

Answers

Answer:

tourist attraction

Explanation:
Tourist attraction.

Example: Things like the Statue of Liberty or the Eiffel Tower are tourist attractions that make people want to visit that new place .

hope this helps !

What is the Big Bang

Answers

the rapid expansion of matter from a state of extremely high density and temperature that according to current cosmological theories marked the origin of the universe.

I will give brainliest!! Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationshops among reactants and products in chemical reactions?

a
quantitative analysis
b
entrophy
c
chemical kinetics
d
stoichiomentry

Answers

That would be D Stoichiometry.

Answer:

d

Explanation:

Please help!!!!its due tomorrow !!!

Answers


#6).
Every 1,000 mL makes 1 L
How many 1,000mL are there in  2,800 mL ?
That's division.
                         (2,800 mL) / (1,000 mL) = 2.8 L

#7).
The 'perimeter' means the 'distance all the way around'.
You have to know that both sides of a rectangle are the same length,
and also the top and bottom are the same length.
So the perimeter of this rectangle is

   (2 yd) + (4.5 yd) + (2.yd) + (4.5 yd) = 13 yd .

Oops.  The problem wants to know the perimeter in feet.
So you have to know that each yard is the same as 3 feet.
In order to find the number of feet in 13 yards, you have to
take 3 feet 13 times .

       (3 feet) times (13)  =  39 feet .

#8).
For this one, you have to know that every 36 inches makes 1 yard.

How many 36 inches are there in 48 inches ?
That's division.
                         (48 inches) / (36inches)  =  1 and 1/2 yards .

#9).
For this problem, you have to know how to handle a mixed number,
and you also have to know that there are 16 ounces in 1 pound.

Add up the fruit:

             (3-1/2 pounds) + (4 pounds) + 2 pounds)  =  9-1/2 pounds

Now, remember that each pound is the same as 16 ounces.  So if you
want to find the number of ounces in  9-1/2 pounds, you have to take
16 ounces  9-1/2 times .

     (16 ounces) times (9-1/2) = 152 ounces.
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#10).
This one is just adding up some numbers.  But after you finish doing that, you have to know that  1,000 meters is called '1 kilometer' .

Add up the distances that Omar ran:

   (1,000 meters) + (1,625 meters) + (1,500 meters)  =  4,125 meters

The problem wants to know how many kilometers this is, so you have to figure out how many '1,000 meters' fit into 4,125 meters.

That's division.

   (4,125 meters) / (1,000 meters)  =  4.125 kilometers

What is biodiversity? I don't really understand...

Answers

Answer:

it is also know as biological diversity

Explanation:

it refers to the varieties or various forms of plants and animals species

The elements in Group 2 have similar chemical properties because each atom of these elements has the same(a) atomic number
(b) mass number
(c) number of electron shells
(d) number of valence electrons

Answers

Answer;

- (d) number of valence electrons

The elements in Group 2 have similar chemical properties because each atom of these elements has the same number of valence electrons.

Explanation;

-Group 2 elements are also called alkaline earth metals, such as calcium, magnesium, strontium, barium , etc.

-These metals have a valency of two, which means they have two electrons in the outermost energy shell. Therefore; they react by loosing two electrons to form a stable configuration or an octet configuration. They are highly metallic and are good conductors of electricity.
The elements in Group 2 have similar chemical properties 'cause they have the same no. of electrons.
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An ice cube is placed in a plastic cup on the lab table. Students record the mass of the ice cube and the plastic cup as 5 grams. One hour later the ice cube completely melts, turning into liquid water. Then, the students record the mass of the water and the cup. What is the mass of the water and plastic cup?