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3 years ago

Is this better to see than the other one

Chemistry

1 answer:

Nimfa-mama [501]3 years ago

8 0

Number 2. This is a power plant windmill. Kinetic energy from the wind is being converted to mechanical energy.

Number 3. Those are energy power plants which involve coal being burned. Chemical energy is being converted to heat energy and then into kinetic energy.

Number 3. You're welcomed to use whatever object you'd like. An example you could put is a car. Chemical energy is being converted to mechanical energy.

Hope that helps. -UF aka Nadia

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What contributions led to the acceptance of the heliocentric model of the solar system

Alik [6]

Answer:

It was just on a way and scienticts cant really "delete" it from galaxy so they descided accepting it and study it.

Explanation:

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3 years ago

In an experiment you are asked to react hydrochloric acid with sodium hydroxide. When measuring the volume of the reactants, whi

aleksklad [387]

Answer:

100 mL Graduated cylinder.

Explanation:

The instrument would give the greatest precision is 100 mL Graduated cylinder.

Because it has the smallest diameter and it is graduated every 1.0 mL. so, its error percent is the lowest.

Beaker and Erlenmeyer flask have a greater diameter and their grauation is every 10.0 mL. So, their error % is larger.

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3 years ago

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Setler79 [48]

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3 years ago

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A chromium oxide compound contains 104.0 grams of chromium and 48.0 grams of oxygen. What is the most likely empirical formula o

TEA [102]

Answer: Empirical formula of this compound is $Cr_2O_3$

Explanation:

Mass of Cr= 104.0 g

Mass of O = 48.0 g

Step 1 : convert given masses into moles.

Moles of Cr = $\frac{\text{ given mass of Cr}}{\text{ molar mass of Cr}}= \frac{104.0g}{52g/mole}=2moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{48.0g}{16g/mole}=3moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Cr = $\frac{2}{2}=1$

For O = $\frac{3}{2}=1.5$

Converting into simple whole number ratios by multiplying by 2

The ratio of Cr : O= 2: 3

Hence the empirical formula is $Cr_2O_3$

The most likely empirical formula of this compound is $Cr_2O_3$

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3 years ago

How does the acid level in a lake affect how many fish live there?

nikklg [1K]

If the level of acid in a lake increased, then the number of fish that live there will be decreased because highly acidic lakes will not have enough food for the fish to survive. Acidic level increases , then availability of food for fish decreases as some food will be contaminated so if the fish won't got enough food for their survival then their number of fish decreases.

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2 years ago