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denpristay [2]
4 years ago
15

How do you know if a physical change is taking place or has happened?

Chemistry
1 answer:
labwork [276]4 years ago
3 0
In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring.
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In one scene in the movie The Godfather II,
Ad libitum [116K]
10 cm in a cube to find volume is 10 by 10 by 10
1000 cm cubed

10 cm is 0.1 m
0.1 times 0.1 times 0.1 is 0.001 metres cubed
19,300 times 0.001 is
19.3 kg
approximately 193newtons
yes it could be passed around casually
5 0
3 years ago
Which of the following statements is correct about the gases which participate in photosynthesis?
antoniya [11.8K]
First let's look at the photosynthesis equation:

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

We know that:

CO₂ is carbon dioxide
H₂O is water
<span>C₆H₁₂O₆ is glucose
</span><span>O₂ is oxygen
</span>
We also know that the left side of the reaction is the reactants (which gets used up), and the right side is what is produced.

Now, we can look at each of the choices to see which one matches the equation:

We can eliminate the last two choices automatically because there is no hydrogen atoms present on either side.
The second one is not correct because oxygen is a product, not a reactant.

Therefore, the answer is the first one because carbon dioxide is a reactant, and oxygen is a product.
8 0
3 years ago
Use your knowledge of atoms, bonding, and the periodic table to complete the chemical equation .”CH4 + O2
kherson [118]

Answer:

CH4 + O2 = CO2 + H2O.

3 0
3 years ago
Read 2 more answers
___________ minerals are dark-colored because they contain _____________. a. Mafic; iron and/or magnesium b. Felsic; iron and/or
Likurg_2 [28]

Answer:

A. Mafic; iron and/or magnesium

Explanation:

Let's find the answer by naming some minerals and their chemistry.

Mafic minerals are dark-colored whereas felsic minerals are light-colored, thats way mafic rocks are dark-colored because they are mainly composed by mafic minerals and the other way around for felsic rocks.

But remember that mafic minerals as amphiboles, pyroxenes or biotites, involve in their chemical structure iron and/or magnesium. Although calcium and sodium can be incorporated in amphiboles and clinopyroxenes, they are not involved in orthopyroxenes and biotites. On the other hand, although potassium is involved in biotite and in some extent in amphiboles, this element is not involved in pyroxenes.

So in conclusion, mafic minerals are usually dark-colored because they involve iron and/or magnesium in their chemical structures.  

4 0
3 years ago
The teacher in item 10 also needs to order plastic tubing. If each of the 60 students need 750 mm of tubing, what length of tubi
Alex777 [14]

45 m. If each student needs 750 mm of tubing, the teacher should order 45 m of tubing.

a) Find the <em>length in millimetres</em>

Length = 60 students x (750 mm tubing/1 student) = 45 000 mm tubing

b) Convert <em>millimetres to metres </em>

Length = 45 000 mm tubing x (1 m tubing/1000 mm tubing) = 45 m tubing

6 0
3 years ago
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