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3 years ago

Please help! Refer to photo.

Chemistry

1 answer:

butalik [34]3 years ago

4 0

Answer:

4-methyl-1-pentyne or 4-methylpent-1-yne

Explanation:

presence of triple bond(alkyne)

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Predict the products of the double replacement reaction 2KOH + H2504 --?

Darina [25.2K]

What the heck is this 9287262729272727272727171

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3 years ago

Rank the species CH2NH, CH3I, HF, C2H6 from most to least miscible in ammonia (NH3) 1. CH3I > C2H6 > HF > CH2NH 2. CH2N

777dan777 [17]

Answer:

$HF>CH_{2}NH>CH_{3}I>C_{2}H_{6}$

Explanation:

$NH_{3}$ is an weak base. HF is an weak acid. Hence an acid-base reaction will ocuur between $NH_{3}$ and HF resulting a homogeneous mixture.

$NH_{3}$ is a polar protic molecule. Hence it can form hydrogen bonding with another polar protic molecule $CH_{2}NH$ . Also dipole-dipole attraction force along with london dispersion force exists between $CH_{2}NH$ and $NH_{3}$ .

$CH_{3}I$ is a polar molecule. Hence only dipole-dipole attraction force along with london dispersion force operates between $CH_{3}I$ and $NH_{3}$ .

$C_{2}H_{6}$ is a non-polar molecule. Hence only london dispersion force exists between $C_{2}H_{6}$ and $NH_{3}$ .

So, order of miscibility: $HF>CH_{2}NH>CH_{3}I>C_{2}H_{6}$

(most) (least)

5 0

3 years ago

A taco from a fast food restaurant contains 7.0 g of fat, 25. g of carbohydrate, and 11 g of protein. How many kJ of energy does

Gennadij [26K]

Answer: 878 kJ of energy is there in cheeseburger

Explanation:

Given : calorific value of fat = 38kJ/g

calorific value of carbohydrate = 17 kJ/g

calorific value of protein = 17kJ/g

1 g of fat contains energy = 38 kJ

7.0 g of fat contains energy = $\frac{38}{1}\times 7.0=266 kJ$

1 g of carbohydrate contains energy = 17 kJ

25 g of fat contains energy = $\frac{17}{1}\times 25=425kJ$

1 g of protein contains energy = 17 kJ

11 g of protein contains energy = $\frac{17}{1}\times 11=187kJ$

Total energy = (266+425+187) kJ = 878 kJ

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3 years ago

What are two forms of electromagnetic energy

Aleksandr [31]

Answer:

You can pick any two from these:

Radio waves

Microwaves

Infrared radiation

Visible light: red, orange, yellow, green, blue, violet.

Ultraviolet light

X-rays

Gamma radiation

Explanation:

Electromagnetic energy is the is the energy that travels in form of transverse waves produced by the perpendicular oscilations electrical and magnetic fields.

An important characteristic of electromagnetic energy (waves) is that they do not need a material medium to propagate (travel) but they can travel in vacuum. That is how the sun light gets to the Earth through space.

Depending of the wavelength and frequency (which are inversely related) each electromagnetic wave has different amount of energy, involves particular risks and finds different applications.

Among other uses, we can mention: radio waves and mcirowaves are useful for communications, in infrared transmits heat, visible light permits see the objects, ultraviolet may be used in security systems, x-rays and gamma rays have medical uses.

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3 years ago

A noticeably different form or state of the substance

LuckyWell [14K]

The answer is phase!

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3 years ago