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2 years ago

Need answers for Chemistry asap. Will give brainliest.

Chemistry

2 answers:

solniwko [45]2 years ago

7 0

Answer:

a) 0.4 moles

b) 0.3 moles

N76 [4]2 years ago

3 0

Answer:

Balance chemical equation is

O2(g) + 2H2(g) --> 2H20(g)

a. 0.20 mol 02 --> 0.225mol H20

b. 0.30 mol H2 --> 2.7mol H20

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What did J. J. Thomson observe when he applied electric voltage to a cathode ray tube in his famous experiment?

Nataly_w [17]

The glass opposite to the negative electrode started to glow. Hence, option B is correct.

<h3>What is a cathode ray tube?</h3>

A cathode-ray tube (CRT) is a specialized vacuum tube in which images are produced when an electron beam strikes a phosphorescent surface.

J.J. Thomson, through his famous Cathode ray experiment, proved that all atoms contain small negatively charged particles known as electrons. In the experiment, he applied electric voltage across a cathode ray tube. a fluorescent material coating was done on the positive side. When the voltage was applied, the positive side has glowing dots.

Hence, option B is correct.

Learn more about the cathode ray tube here:

brainly.com/question/14409449

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1 year ago

In the science fiction movie, The Abyss, a diver is able to breathe while his head is immersed in a specially prepared liquid pu

Klio2033 [76]

Answer:

Explanation:

This type of experiment was carried out in 1960s on rodents, it was partially successful but was perceived impractical and dangerous for humans,it is possible theoretically.

Oxygen is broken down or dissolves in a thin film of fluid in the alveoli, surprisingly in normal breathing liquid composed of dissolved oxygen is involved. Evidently respiratory gas must be able to dissolve in this liquid and in concentration required to keep the partial pressure necessary to power diffusion.

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3 years ago

If the temperature of the water an ice cube is placed in is ______________, then the ice cube will melt __________.

Anit [1.1K]

Answer:

I have no clue what is being asked in the second half of the question. Is there some context from which the question is taken?

Explanation:

If the temperature of the water an ice cube is placed in is <u>___above 0°C__</u>, then the ice cube will melt <u>_unless you remove it??_________</u>.

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2 years ago

Phosphoric acid, which is commonly used as rust inhibitor, food additive and etching agent for dental and orthopedic use, can be

lana66690 [7]

Answer: $P_4(l)+5O_2(g)+3H_2O(l)\rightarrow 2H_3PO_4(l)$

Explanation:

We are given two reactions which are the two steps of a mechanism:

$P_4(l)+5O_2(g)\rightarrow 2P_2O_5(g)$ ......(1)

$P_2O_5(g)+3H_2O(l)\rightarrow 2H_3PO_4(l)$ .......(2)

To determine the net chemical equation, we will multiply equation 2

$P_2O_5(g)+3H_2O(l)\rightarrow 2H_3PO_4(l)\times 2$

$2P_2O_5(g)+6H_2O(l)\rightarrow 4H_3PO_4(l)$ .......(3)

Adding (1) and (3)

$P_4(l)+5O_2(g)+3H_2O(l)\rightarrow 4H_3PO_4(l)$

Thus, the net balanced chemical equation is:

$P_4(l)+5O_2(g)+3H_2O(l)\rightarrow 4H_3PO_4(l)$

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3 years ago

Acrostic: Dihydrogen Monoxide

goldenfox [79]

D - Dangerous substance
I - It's colorless and odorless
H - Harmful to people and property
Y - You can't taste it
D - Disrupts cell membranes
R - Reactive Hydroxyl Radical
G - Gene and DNA mutations
E - Explosive compounds
N - Neurotransmitters can be critically altered

M - Most people don't know what it its
O - Only people who look into it will find out
N - Nothing can survive without it
O - Otherwise safe
X - X marks the spot, you can find it on many maps
I - Included in everything
D - Drinkable, it's safe
E - Especially because it's WATER, H2O

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2 years ago