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3 years ago

Can you think of another way the Egyptians might have tried to reduce friction to move the heavy blocks?

2 answers:

8 0

There are different techniques to reduce friction, similar to 1. Cleaning the surfaces 2. Including lubricants 3. expanding the temperature 4. wetting the surface 5. expelling polluting influences. Egyptian could have moved the square through water, which would be Fluid Friction, and makes it less demanding to move.

Zigmanuir [339]3 years ago

3 0

The Egyptians used a weird method to reduce friction by pouring water onto the sand, causing the sand to clump together and make it easier to pull along due to the reason that each individual piece of sand doesn't hold it back. They called this weird technique capillary bridges. Also they might ave used round logs to reduce the friction. Hope it helps!

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How many mol in 4.55 g of silver?

Mamont248 [21]

Answer: The answer is 107.8682. I assume you are converting between grams Silver and mole. You can view more details on each measurement unit: molecular weight of Silver or mol The molecular formula for Silver is Ag. The SI base unit for amount of substance is the mole. 1 grams Silver is equal to 0.0092705727916105 mole.

4 0

3 years ago

A 0.4272 g sample of an element contains 2.241 x 10 ^21 atoms . what is the symbol of the element?

grin007 [14]

Answer:

Likely $\rm In$ (indium.)

Explanation:

Number of atoms: $N = 2.241 \times 10^{21}$ .

Dividing, $N$ , the number of atoms by the Avogadro constant, $N_A \approx 6.023 \times 10^{23} \; \rm mol^{-1}$ , would give the number of moles of atoms in this sample:

$\begin{aligned} n &= \frac{N}{N_{A}} \\ &\approx \frac{2.241 \times 10^{21}}{6.023 \times 10^{23}\; \rm mol^{-1}} \approx 3.72 \times 10^{-3}\; \rm mol \end{aligned}$ .

The mass of that many atom is $m = 0.4272\; \rm g$ . Estimate the average mass of one mole of atoms in this sample:

$\begin{aligned}M &= \frac{m}{n} \\ &\approx \frac{0.4272\; \rm g}{3.72 \times 10^{-3}\; \rm mol} \approx 114.82\; \rm g \cdot mol^{-1}\end{aligned}$ .

The average mass of one mole of atoms of an element ( $114.82\; \rm g \cdot mol^{-1}$ in this example) is numerically equal to the average atomic mass of that element. Refer to a modern periodic table and look for the element with average atomic mass $114.82$ . Indium, $\rm In$ , is the closest match.

5 0

3 years ago

Determine which pair of atoms has the greatest polarity.

nexus9112 [7]

According to the <span> chart represented above, I have determined the pair of atoms which has the greatest polarit and I am pretty sure that it is the first option from the scale :</span>A. Al-Si. I consider this to be correct due to their incredible difference <span>difference in electronegativity.
Hope it helps!</span>

5 0

2 years ago

Read 2 more answers

ANSWER THIS AND YOU WILL BE THE BRAINEST!!!!!!!

Alenkasestr [34]

<h3>Answer:</h3>

Option-B (Halide; oxide) is the correct answer.

<h3>Explanation:</h3>

<em> Halides</em> are those substances which contains negatively charged halide ion i.e. X⁻.

Examples: F⁻ (Fluoride) , Cl⁻ (Chloride) , Br⁻ (Bromide) , I⁻ (Iodide) e.t.c.

<em>Oxides </em>are those substances which atleast containn one Oxygen atom.

Examples: FeO (Iron Oxide), Cr₂O₃ (Chromium Oxide)

<em>Silicates</em> are those anionic substances which contains silicon and oxygen with general formula [SiO. 4−x] n.

Examples: [SiO₄]⁻⁴ (Nasosilicate) , [Si₂O₇]⁻⁶ (Sorosilicates)

<em>Carbonates </em>are those substances which contains carbonate anion i.e. CO₃²⁻.

Examples: Na₂CO₃ (Sodium Carbonate) , MgCO₃ (Magnesium Carbonate)

<h3>Conclusion:</h3>

As in NaCaAlF, F⁻ is present hence, it is an Halide and the presence of O in FeCrO makes it Oxide.

5 0

3 years ago

What do scientists use the term “light-year” to describe?

Tatiana [17]

Answer:

Astronomers measure distance in space or the distance light travels in one Earth year.

" A light-year is how astronomers measure distance in space. It's defined by how far a beam of light travels in one year – a distance of six trillion miles."

7 0

3 years ago