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larisa86 [58]
2 years ago
9

What is the definition of a chemical change that when two or more substances (molecules) combine to form a new substance (or new

molecules).
Chemistry
2 answers:
gladu [14]2 years ago
7 0
It’s Synthesis reaction
lianna [129]2 years ago
5 0

Answer:

synthesis reaction

Explanation:

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SHOW WORK AND INCLUDE UNITS
Ber [7]

Answer:

36365.4 Joules

Explanation:

The quantity of Heat Energy (Q) released on cooling a heated substance depends on its Mass (M), specific heat capacity (C), and change in temperature (Φ)

Thus, Q = MCΦ

Since, M = 45.4 g

C = 3.56 J/g°C,

Φ = 250°C - 25°C = 225°C

Q = 45.4g x 3.56J/g°C x 225°C

Q= 36365.4 Joules

Thus, 36365.4 Joules of heat energy is released when the lithium is cooled.

6 0
3 years ago
I need this answer ASAP
asambeis [7]

Answer:

B: Physical Science

Explanation:

The answer is physical science because you need to know the laws of physics and chemistry to know how a car works. Physical sciences = the sciences concerned with the study of inanimate natural objects, including physics, chemistry, astronomy, and related subjects.

5 0
3 years ago
Please help me out with this question if you help me I will give you the brain thing and extra points. 8/9 image below.
Nataly [62]

Answer:

the answer is most likely b, sorry if im wrong.

Explanation:

.....

7 0
2 years ago
Read 2 more answers
How many moles are in 63 g of NH4 (molar mass= 18g)?
sdas [7]

To answer this question, all you to do is to divide the mass by the molar mass and that should get you your moles.

=63g\ NH_{4}\ x\ \frac{1\ mol\ NH_{4}}{18g\ NH_{4}}

<em>= 3.5 mol NH₄</em>

<em></em>

<em></em>

4 0
2 years ago
Read 2 more answers
A balloon under 14.7 atm of pressure at 273K gets left in a car in Florida and the temperature increases to 303K. What is the ne
Firdavs [7]

Answer:

The new pressure in the balloon is 16.3 atm

Explanation:

Gay-Lussac's law establishes the relationship between the temperature and the pressure of a gas when the volume is constant.

This law establishes that pressure and temperature are directly proportional quantities, that is to say that if the temperature increases the pressure increases and if the temperature decreases the pressure decreases.

Mathematically, Gay-Lussac's law states that, when a gas undergoes a constant volume transformation, the quotient of the pressure exerted by the gas temperature remains constant:

\frac{P}{T}=k

When you want to study two different states, an initial one and a final one, of a gas, you can use the expression:

\frac{P1}{T1}=\frac{P2}{T2}

In this case:

  • P1= 14.7 atm
  • T1= 273 K
  • P2= ?
  • T2= 303 K

Replacing:

\frac{14.7 atm}{273 K}=\frac{P2}{303 K}

Solving:

P2=303K*\frac{14.7 atm}{273 K}

P2= 16.3 atm

<u><em>The new pressure in the balloon is 16.3 atm</em></u>

4 0
2 years ago
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