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3 years ago

The _______ is a factor that's affected by changes in the independent variable.

Chemistry

1 answer:

zloy xaker [14]3 years ago

6 0

The answer to your question is dependent variable.

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Approximately how many ice cubes must melt to cool 650 milliliters of water from 29°C to 0°C? Assume that each ice cube contains

qwelly [4]

Answer : The number of ice cubes melt must be, 13

Explanation :

First we have to calculate the mass of water.

$\text{Mass of water}=\text{Density of water}\times \text{Volume of water}$

Density of water = 1.00 g/mL

Volume of water = 650 mL

$\text{Mass of water}=1.00g/mL\times 650mL=650g$

Now we have to calculate the heat released on cooling.

Heat released on cooling = $m\times c\times (T_2-T_1)$

where,

m = mass of water = 650 g

c = specific heat capacity of water = $4.18J/g^oC$

$T_2$ = final temperature = $29^oC$

$T_2$ = initial temperature = $0^oC$

Now put all the given values in the above expression, we get:

Heat released on cooling = $650g\times 4.18J/g^oC\times (29-0)^oC$

Heat released on cooling = 78793 J = 78.793 kJ (1 J = 0.001 kJ)

As, 1 ice cube contains 1 mole of water.

The heat required for 1 ice cube to melt = 6.02 kJ

Now we have to calculate the number of ice cubes melted.

Number of ice cubes melted = $\frac{\text{Total heat}}{\text{Heat for 1 ice cube}}$

Number of ice cubes melted = $\frac{78.793kJ}{6.02kJ}$

Number of ice cubes melted = 13.1 ≈ 13

Therefore, the number of ice cubes melt must be, 13

3 0

4 years ago

Humans have cut and frayed the woven tapestry of Earth’s biodiversity. Choose 2 of the 3 intertwined systems mentioned in the fi

Flura [38]

The answer is GENETIC DIVERSITY and SPECIES DIVERSITY

8 0

3 years ago

Read 2 more answers

What element is found in liver and is needed to prevent anemia or “tired” blood?

lara31 [8.8K]

Answer:

Iron (Fe)

Explanation:

5 0

3 years ago

Magnesium nitrate contains chemical bonds that are

SVETLANKA909090 [29]

Answer:

Magnesium Nitrate is an ionic compound formed by:

Magnesium;Mg+2 (the cation) and Nitrate NO−3 (the poly-atomic anion).

In order for these two ions to bond, the charges must be equal and opposite. Therefore, it will take:

two -1 nitrate ions to balance the one +2 magnesium ion.

3 0

2 years ago

A greenhouse is filled with air that cotains more carbon dixoide than normal air has. How might phothsyphness and plant growth b

vekshin1

Answer:

See explanation

Explanation:

We know that photosynthesis involves the combination of carbon dioxide and water in the presence of sunlight to yield glucose.

If the atmosphere is rich in carbon dioxide such as in a green house where air is filled with carbon dioxide, the rate of photosynthesis is increased.

As the rate of photosynthesis is increased, the growth of plants is also increased.

Hence, in a greenhouse where the air contains more carbon dioxide, the rate of plant growth increases.

4 0

3 years ago