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lubasha [3.4K]
2 years ago
8

I need help on this.

Chemistry
1 answer:
LuckyWell [14K]2 years ago
6 0
Number 1 is 2-2-2-1, subscripts and coefficients will determine the number of molecules, they'll need to balance on left and right sides of the arrow. Check Tyler Dewitt on YouTube for balancing chemical equations
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Which statement explains the method to adjust the strength of the flame on the Bunsen burner?
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Answer:

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2 years ago
If the heat of fusion for water is 334 j/g, how many Jules are needed to melt 45.0 g of ice at 0.0°c?
finlep [7]

Given parameters:

Heat of fusion of water  = 334j/g

Mass of ice  = 45g

Temperature of ice =  0.0°c

Unknown:

Amount of heat needed to melt = ?

Solution:

This is simply a phase change and a latent heat is required in this process.

  To solve this problem; use the mathematical expression below;

             H  = mL

where m is the mass

            L is the heat of fusion of water;

              H  = 45 x 334  = 15030J

7 0
3 years ago
A 28.5 gram piece of iron is added to a graduated cylinder containing 45.5 mL of water. The water in the cylinder rises to the 4
yan [13]

7.91 g/ml is the density of the iron piece of 28.5 gms.

Explanation:

The density of a substance is defined as the volume it occupies.  It tells the matter present in a substance.

The density is mass per unit volume and is denoted by p.

The formula for density is given by:

density (p) = \frac{mass}{volume}

Data given is :

mass= 28.5 grams

V1 = 45.5 ml

V2= 49.1 ml

The initial volume of water was 45.5 ml, when iron piece of 28.5 grams was added the final volume was 49.1 ml.

Putting the values in the equation of density

p = \frac{28.5}{49.1-45.5}

p = 7.91 g/ml

Since iron is a dense material it will occupy less volume

4 0
3 years ago
If liquid water is exposed to normal atmospheric pressure, what needs to change in order to change its state of matter?
LUCKY_DIMON [66]
Mass of water because then it will change his States of matter
5 0
3 years ago
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