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Ksivusya [100]
2 years ago
11

Water has a formula of H2O. Based on the formula which is NOT a correct statement?

Chemistry
2 answers:
Sindrei [870]2 years ago
8 0

Answer:

A.water is a molecule

Explanation:

water is a molecule not a element

ELEN [110]2 years ago
3 0
Answer: A. It is an element.

Explanation: An element cannot be broken down into simpler substances. For example, oxygen and hydrogen are elements.
A compound is two or more elements joined by electrons. Water is a compound.
The formula for water is H2O, which can be read as “two hydrogen atoms and one oxygen atoms.” Therefore, water contains both oxygen and hydrogen.
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30,000 J of heat are added to 23.0 kg of steel to reach a final temperature of 140
kolbaska11 [484]

The initial temperature is 137.34 °C.

<u>Explanation:</u>

As the specific heat formula says that the heat energy required is directly proportional to the mass and change in temperature of the system.

Q = mcΔT

So, here the mass m is given as 23 kg, the specific heat of steel is given as c = 490 J/kg°C and the initial temperature is required to find with the final temperature being 140 °C. Also the heat energy required is 30,000 J.

ΔT =\frac{Q}{mc}

ΔT =\frac{30000}{23 \times 490} = \frac{30000}{11270} =2.66

Since the difference in temperature is 2.66, then the initial temperature will be

Final temperature - Initial temperature = Change in temperature

140-Initial temperature = 2.66

Initial temperature = 140-2.66 = 137.34 °C

Thus, the initial temperature is 137.34 °C.

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What is the main function of the cell membrane in an animal cell?
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A cell's plasma membrane, also known as the cell membrane, provides protection. It also maintains a constant atmosphere within the cell, and the membrane serves a variety of purposes. The first is to transport nutrients into the cell, and the second is to transport toxic compounds out

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5 0
2 years ago
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a block of iron has the dimensions of 3.00 cm x 3.00 cm x 3.00 cm. it has a mass of 213 g. what is its density? a. 638 g/cm3 b.
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Volume = 3 cm × 3cm × 3cm
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Density  =  \frac{MASS}{VOLUME}
 
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</span> 
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Thus answer is D.</span>
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