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monitta
3 years ago
11

The engineering process defines the steps engineers take to create

Chemistry
2 answers:
Alinara [238K]3 years ago
8 0

Answer:

A. Identifying a need, researching the background of that need,

making a plan to meet the need, doing the work, evaluating the

results, looking for improvements

Explanation: A P EX

kupik [55]3 years ago
5 0

Answer:

A.

Explanation:

Common sense<3

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When a substance gains or loses energy, it’s _____ changes, or its _____ chafes. Theses two changes do ___happen at the time ; t
Veseljchak [2.6K]

Answer:

When a substance gains or loses energy, its <u>temperature</u> or <u>state</u> changes. These two changes do <u>not</u> happen with respect to time; the temperature remains <u>the same</u> until the change of <u>state</u> is complete.

Explanation:

This statement is about energy and change of the state of the matter. By gaining or losing energy, the physical state of the matter can change into one another. Melting, freezing, condensation, evaporation, sublimation, and deposition are the processes that support to change the physical state of the matter. Change in state and change in the matter do not happen at the same time. A substance gains or loses energy to reach a specific temperature and remains constant until the physical change of matter is completed.

3 0
3 years ago
What mass of F2 is needed to produce 180 g of PF3 if the reaction has a 78.1% yield?
nexus9112 [7]

Answer:

91.26 g

Explanation:

Given data:

Mass of PF₃ = 180 g

Mass of F₂ required = ?

Solution:

Chemical equation:

P₄ + 6F₂   → 4PF₃

Moles of PF₃:

Number of moles = mass/ molar mass

Number of moles = 180 g/ 88 g/mol

Number of moles = 2.05 mol

Now we will compare the moles of PF₃ with F₂.

                        PF₃            :           F₂

                          4               :           6

                          2.05         :           6/4×2.05 = 3.075

Mass of  F₂:

Mass of F₂ = moles × molar mass

Mass of F₂ = 3.075 mol × 38 g/mol

Mass of F₂ =  116.85 g

If reaction yield is 78.1%:

116.85 /100 ×78.1 = 91.26 g

6 0
3 years ago
What happend to the pressure of a gas inside a container if the temperatures of the gas decreases
ludmilkaskok [199]
There is an increase in the number of collisions between particles and the walls of the container<span>. b. There is an increase in the </span>temperature of the gas. If<span> the volume of a </span>container<span> of </span>gas<span> is reduced, what will </span>happen to the pressure inside<span> the </span>container
4 0
3 years ago
Why does the rate of a chemical reaction increase with a rise in the temperature of the reactants?
klasskru [66]
More collisions occur making the particles used up
4 0
3 years ago
Can someone please explain what to do it’s late at night and I need sleep but I forgot I had this homework please help me with a
Rus_ich [418]

Answer:

1) it takes 13 second

2) 2100 miles

3) 40 miles / hours

4) 730 meters

4 0
2 years ago
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