Which value has more significant figures?
A)2.63x10^6 B)0.0000026

Answers

Answer 1

Answer:

Answer:

use Google this will help you alot and also use chegg

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12a. Do i need to find the morality of each ion in the solution to get to the moles? Or do i just do AlCl3

Answers

You just use the morality of the solution, you found out that you have 0.0046mol (about 0.005mol0 of AlCl3, so then since there is 1 Al in a single molecule, you have the number of moles of aluminum, but since there is Cl3 (3 atoms of chlorine per molecule), just multiply the number of moles of molecules by the number of atoms of that type inside a single molecule, to get [Cl-] = 0.0138mol (or round to 0.014)

Select all that apply.1: Which of the following particles are of approximately equal mass?

A: protons
B:electrons
C:neutrons
D:quarks
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2: If the atomic number of an element is 16, then it has 16 electrons.

True
False
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3: An unknown substance is tested and found to have the following physical properties:

brittle
fair conductor of electricity
dull (not shiny)

The substance is most likely a _____.

A:metal
B:metalloid
C:nonmetal
D:can not be determined without more data
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Answers

1)Protons and Neutrons have approximately equal masses

2)TRUE

3) B-Metalloid

Answer:

its a and b

Explanation:

i got it right on test

The early alchemists used to do an experiment in which water was boiled for several days in a sealed glass container. Eventually, some solid residue would appear in the bottom of the flask, which was interpreted to mean that some of the water in the flask had been converted into "earth." When Lavoisier repeated this experiment, he found that the water weighed the same before and after heating, and the mass of the flask plus the solid residue equaled the original mass of the flask. Were the alchemists correct?

Answers

Answer:

Explanation:

Hello,

Since the sealed glass container is isolated (closed system) no escape of boiled water (steam) was presented, so it is obvious that the alchemists were wrong, it is impossible that the water turns into "earth" because it has components that water does not have by itself (metallic and nonmetallic ions and molecular compounds) that is why the solid residue could have come from suspended solids or simply solids that were initially dissolved and due to the boiling of water, they remained at the bottom of the flask. Nevertheless, the experiment done by Lavoisier was more precise because the conclusion based on the initial and final masses, accounts for the boiling process; besides, the mass agreement substantiates that no mass was removed due to the isolation of the flask.

Best regards.

Is baking soda a fine powder or is it coarse

Answers

Baking soda is a fine powder because when you touch it the baking soda is very soft

A 133.8-gram sample of bronze was 10.3% tin by mass. Determine the total mass of tin in the sample.

Answers

You just need to multiply the total mass by the decimal value of the part that is tin. 133.8*0.103=13.8g (following the rules of significant figures).

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