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weqwewe [10]
3 years ago
10

Pls I need help! I need answer and explanation.

Chemistry
1 answer:
gizmo_the_mogwai [7]3 years ago
8 0
Answer: 2LiBr(aq) + F2(g) —> 2LiF + Br2

explanation: Br and F are both nonmetals. Nonmetals should only replace other nonmetals in a single replacement reaction.
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Calculate the amount of energy when water at 72 degrees c freezes completely at 0 degrees c
gtnhenbr [62]

<u>Answer:</u>

<em>The amount of energy needed when water at 72 degrees c freezes completely at 0 degrees c is 6.37\times10^4 Joules</em>

<em></em>

<u>Explanation:</u>

Q = m \times c \times \Delta T

where

\Delta T = Final T - Initial T

$Q_{1}=100 g \times 4.184 \frac{J}{g^{\circ} \mathrm{C}} \times\left(72^{\circ} \mathrm{C}-0^{\circ} \mathrm{C}\right)$

Q_1 =30125J

Q is the heat energy in Joules  

c is the specific heat capacity (for water 1.0  cal/(g℃))  or 4.184  J/(g℃)

m is the mass of water

mass of water is assumed as 100 g (since not mentioned)

Q_2  is the heat energy required for the phase change

Q_2 =mass × heat of fusion

\\$Q_{2}=100 g \times 336 \frac{J}{g}$\\\\$Q_{2}=33600 J$

Total heat = Q_1 + Q_2

Total Heat = 30123J + 33600J

= 63725 J

= 6.37\times10^4 Joules is the answer

3 0
3 years ago
Shaila is collecting data to calculate the density of a piece of wood. First, she
zzz [600]

Answer:

Explanation:

Remark

You have 2 facts that you got from the experiment. The first is that the mass of the wood is 63.85 grams and the volume can be calculated.

From there, the desity can be found.

Givens

m = 63.85 grams

vo = 50 mL

vf = 125 mL

Solution

Volume = vf - vo

Volume = 125 mL - 50 ml. This gives you the amount of water that has been moved aside (called displaced)

volume = 75 mL

D = 63.85 grams/ 75 mL

D = 0.851 grams / mL

Some woods actually do have a density less than 1 which is the density of water. These woods float.

4 0
2 years ago
Initial temperature of metal =
Evgesh-ka [11]

Answer:

the correct answers is 100 22.7 and 24.6

Explanation:

did it on edgunity

4 0
3 years ago
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The differences between two molecules include the type of sugar that forms a section of the molecules and the identity of one of
klio [65]

The answer is nucleic acids

3 0
3 years ago
One day on her walk home from school, Leann noticed some rust on an old car.
skad [1K]

Answer:

Iron and Oxygen

Explanation:

Fe is Iron and O2 is Oxygen

4 0
2 years ago
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