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3 years ago

Please help and hurry! I'll give brainliest

Chemistry

2 answers:

jonny [76]3 years ago

7 0

Answer:

hi this it for the Instructions: In this engineering lab, you will build and test a device that releases and absorbs

thermal energy in order to reach a goal. You will need to repeat tests of your device to make sure it

does not need to be redesigned or improved. Record your observations and test measurements in

the lab report below. You will submit your completed report. yea that thing the answer is in the file

Explanation:

sorry for telling you on this :( but i hope this helps

Download docx

andrew-mc [135]3 years ago

3 0

Answer:

Explanation:

there yall go i got a 100 on this :)

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The titration of Na2CO3 with HCl has the following qualitative profile: a. Identify the major species in solution at points A-F.

exis [7]

Answer:

Answer is explained in the explanation section below.

Explanation:

Solution:

Note: This question is incomplete and lacks very important data to solve this question. But I have found the similar question which shows the profiles about which question discusses. Using the data from that question, I have solved the question.

a) We need to find the major species from A to F.

Major Species at A:

1. $Na_{2} CO_{3}$

Major Species at B:

1. $Na_{2} CO_{3}$

2. $NaHCO_{3}$

Major Species at C:

1. $NaHCO_{3}$

Major Species at D:

1. $NaHCO_{3}$

2. $H_{2}CO_{3}$

Major Species at E:

1. $H_{2}CO_{3}$

Major Species at F:

1. $H_{2}CO_{3}$

b) pH calculation:

At Halfway point B:

pH = pK $a_{1}$ + log[ $CO_{3}$ $.^{-2}$ ]/[H $CO_{3}$ $.^{-1}$ ]

pH = pK $a_{1}$ = 6.35

Similarly, at halfway point D.

At point D,

pH = pK $a_{2}$ + log [H $CO_{3}$ $.^{-1}$ ]/[H2 $CO_{3}$ ]

pH = pK $a_{2}$ = 10.33

8 0

3 years ago

Consider the reaction pathway graph below.

Artemon [7]

E and Dis determine the H

3 0

3 years ago

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An unknown substance has the following properties:

Anastasy [175]

Answer:

Homogenous mixture

Explanation:

Homogenous mixtures like ice cream appear to be uniform, and you cannot see their individual components.

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3 years ago

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I am a gas. I am in the noble gas family and row 1. I have only 2 valence electrons I glow red-orange when in an electric field.

belka [17]

The element is Helium

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3 years ago

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g A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. If the

Sliva [168]

Answer:

The total photons required = 5.19 × 10²⁸ photons

Explanation:

Given that:

the radiation wavelength λ= 12.5 cm = 0.125 m

Volume of the container = 0.250 L = 250 mL

The density of water = 1 g/mL

Density = mass /volume

Mass = Volume × Density

Thus; the mass of the water = 250 mL × 1 g/mL

the mass of the water = 250 g

the specific heat of water s = 4.18 J/g° C

the initial temperature $T_1$ = 20.0° C

the final temperature $T_2$ = 99° C

Change in temperature $\Delta T$ = (99-20)° C = 79 ° C

The heat q absorbed during the process = ms $\Delta T$

The heat q absorbed during the process = 250 g × 4.18 J/g° C × 79° C

The heat q absorbed during the process = 82555 J

The energy of a photon can be represented by the equation :

= hc/λ

where;

h = planck's constant = $6.626 \times 10^{-34} \ J.s$

c = velocity of light = $3.0 \times 10^8 \ m/s$

= $\dfrac{6.626 \times 10^{-34} \times 3.0 \times 10^8}{0.125}$

= $1.59024 \times 10^{-24}$ J

The total photons required = Total heat energy/ Energy of a photon

The total photons required = $\dfrac{82555 J}{1.59024 \times 10^{-24}J}$

The total photons required = 5.19 × 10²⁸ photons

5 0

3 years ago