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arsen [322]
3 years ago
15

HELP......Percussion instruments are musical instruments that make noise when they are hit with an object. Which of these are pe

rcussion instruments? Check all that apply.
a clarinet, which makes sound when air is blown into a woodwind mouthpiece

a drum, which makes sound when a mallet hits its surface

a cymbal, which makes sound when it is crashed against another cymbal

a trumpet, which makes sound when air is blown into a brass mouthpiece

a violin, which makes sound when a bow slides across strings
Chemistry
1 answer:
valkas [14]3 years ago
4 0

Answer:

I believe that the percussion instruments are the drum and cymbal.

Explanation:

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You have been given two samples of water. One is from the atlantic ocean and the other is from lake superior. Describe how you w
lbvjy [14]

Answer:

i think by their salinity (the saltiness or amount of salt dissolved in a body of water)

Explanation:

Water salinity is measured by passing an electric current between the two electrodes of a salinity meter in a sample of water.

5 0
3 years ago
A gas sample occupies 2.1 L at a pressure of 101 kPa.
Verizon [17]

Answer:

D) 0.9 L

Explanation:

At constant temperature,

PV = Constant

so,

P1.V1 = P2. V2

101 × 2.1 = 235 × V2

V2 = 0.9 L

6 0
2 years ago
Read 2 more answers
The population of the world is: increasing decreasing no longer changing
grin007 [14]
Increasing every day. in 2013, we had about 7.125 Billion. in 9160, we had closer to 3 billion. It is still on a pretty steady clime today.
3 0
3 years ago
Which of the following pieces of information is given in a half-reaction?
puteri [66]

Answer:

<em>The number of electrons transferred in the reaction</em>

Explanation:

8 0
3 years ago
How do you balance the equation Hydrogen plus Oxygen yield water?
Andre45 [30]
Hey there! Hello!

Not sure if you still need the answer to this question, but I'd love to help out if you do. 

So, the way to balance this equation is pretty simple. First, you need to keep in mind that molecules of hydrogen and oxygen do not come in single molecules, but in bonded pairs, represented by H2 and O2. 

H2+O2=H2O

But, that's incorrect. The combination of 2 hydrogen molecules with 1 oxygen molecule yields water, but that leaves one oxygen molecule leftover. When broken down, this is how many of each molecule is on each side of the previously stated equation:

Left:
H: 2
O: 2

Right:
H: 2
O: 1

So we have to multiply H2O on the right side by 2 in order to get this:

H2+O2=2(H2O)

Left: 
H: 2
O: 2

Right: 
H: 4
O: 2

The last step is to multiply H2 on the left by two to make it match up with the right side, balancing the equation:

2(H2)+O2=2(H2O)

Left: 
H: 4
O: 2

Right: 
H: 4
O: 2

That makes our equation balanced! I hope this helped you out, feel free to ask any additional questions if you need further clarification. :-)
5 0
3 years ago
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