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irakobra [83]
3 years ago
9

PLS HELPA! Which procedure could be used to demonstrate that matter is conserved during a physical change?

Chemistry
2 answers:
Juliette [100K]3 years ago
6 0

Answer:

D

Explanation:

Fudgin [204]3 years ago
4 0

Answer:

im not too smart, but i would say, either b or d

Explanation:

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Alcohol contains __________<br> a. ethanol.<br> b. gasoline.<br> c. opiates.
s2008m [1.1K]
The answer is A. Ethanol. Ethanol is an active principal in alcoholic beverages
5 0
3 years ago
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A scientist was asked to test the effect of a new vitamin for rats. His
Hoochie [10]

Answer:

D. The data supported the hypothesis

Explanation:

The data shows that rats fed a normal diet with the addition of vitamins gained a higher average weight gain in the period of 3 months, compared to rats fed a normal diet. This supports the scientists' hypothesis of "Young rats that had vitamins added to their food would gain weight faster than young rats fed a normal diet."

8 0
2 years ago
Helppppppppp me please
zalisa [80]
D volume
the water evaporated so there is less water

6 0
3 years ago
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Iron is obtained commercially by the reaction of hematite (Fe2O3) with carbon monoxide. How many grams of iron are produced if 1
kherson [118]
 <span>CO is the limiting reactant 
( 25.0 x 3 = 75 moles of CO are required) 

Moles Fe = 30.0 x 2 / 3 = 20.0 
mass Fe = 20.0 x 55.847 g/mol=1117 g </span><span>

I'm just saying</span>
5 0
4 years ago
Calculate the number of Cl atoms that are in 1.1 x 10^-21 moles of Cl atoms.
Margarita [4]

According to Avogadro's number there are 62.53 atoms of chlorine in 1.1x 10^-21 moles of Cl atoms.

<h3>What is Avogadro's number?</h3>

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number or number of moles×Avogadro's number.

ON substitution in above formula number of atoms=1.1×10²¹×6.023×10²³=62.53 atoms

Thus, there are 62.53 chlorine  atoms in 1.1x 10^-21 moles of Cl atoms.

Learn more about Avogadro's number,here:

brainly.com/question/11907018

#SPJ1

6 0
1 year ago
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