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3 years ago

15

The law of conservation of energy states that A: energy is always created and destroyed B: energy cannot be created or destroyed

C: energy is unable to change forms D: energy should be saved as often as possible

1 answer:

matrenka [14]3 years ago

6 0

Answer:

B

Explanation:

This is the First Law of Thermodynamics which states that energy cannot be created or destroyed.

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The following reaction produces ethanoic acid (CHACOOH) from methanol (CH3OH) and carbon

tigry1 [53]

Answer:

$\boxed{\text{300 g}}$

Explanation:

We will need a balanced chemical equation with masses and molar masses, so, let's gather all the information in one place.

M_r: 32 60

CH₃OH + CO ⟶ CH₃COOH

m/g: 160

(a) Moles of CH₃OH

$\text{Moles of CH$_{3}$OH} = \text{160 g CH$_{3}$OH }\times \dfrac{\text{1 mol CH$_{3}$OH }}{\text{32 g CH$_{3}$OH}}= \text{5.00 mol CH$_{3}$OH}$

(b) Moles of CH₃COOH

$\text{Moles of CH$_{3}$COOH} = \text{5.00 mol CH$_{3}$OH } \times \dfrac{\text{1 mol CH$_{3}$COOH}}{\text{1 mol CH$_{3}$OH }} = \text{5.00 mol CH$_{3}$COOH}$

(c) Mass of CH₃COOH

$\text{Mass of CH$_{3}$COOH} =\text{5.00 mol CH$_{3}$COOH} \times \dfrac{\text{60 g CH$_{3}$COOH}}{\text{1 mol CH$_{3}$COOH}} = \textbf{300 g CH$_{3}$COOH}\\\\\text{The maximum mass of ethanoic acid that can be produced is $\boxed{\textbf{300 g}}$}$

3 0

4 years ago

A car with a mass of 3,500lbs accelerates negatively from 35m/s to 8m/s in 8s. What is the

Salsk061 [2.6K]

Answer:

$a=-3.37\ m/s^2$

Explanation:

Given that,

A car accelerates negatively from 35m/s to 8m/s in 8s.

We need to find the car's acceleration.

Initial speed, u = 35 m/s

Final speed, v = 8 m/s

Time, t = 8 s

The acceleration of an object is equal to the rate of change of velocity. So,

$a=\dfrac{v-u}{t}$

Put all the values,

$a=\dfrac{8-35}{8}\\\\a=-3.37\ m/s^2$

So, the acceleration of the car is equal to $-3.37\ m/s^2$ .

8 0

3 years ago

Express as ordinary numbers. 6.02 x 109 =

Ilia_Sergeevich [38]

Answer:

6,020,000,000

Explanation:

The given number is 6.02 × 10⁹. It is written is scientific notation.

As you see it has two parts:

The first part are the digits with the decimal point after the first digit. This part is called mantissa. The mantissa can only have one digit, between 1 and 9, before the decimal point.

The second part is a power of 10. The exponent can be either positive or negative.

If the exponent is negative means that the decimal point must be moved to the left and if the exponent is positive means that the decimal point must be moved to the right.

In the number 6.02 × 10⁹ the exponent is 9, so you must move the decimal point 9 places to the right:

6.02 × 10⁹ = 6.02 × 1,000,000,000 - 6,020,000,000,

5 0

3 years ago

What did ruthorford discover that thomson did not understand

Marianna [84]

Answer: Atoms aren't entirely empty space

Explanation:

Rutherford did his scatter experiment to disprove Thomson's Plum Pudding Model. Rutherford shot helium nuclei at a sheet of gold and expected the particles to all go straight through to a sensor. The reason he expected this was because Thomson said that atoms are mostly made of empty space. Not all the particles went through the gold sheet, a lot of them actually reflected back to him. This meant that atoms aren't entirely empty space and something had to deflect the helium nuclei

4 0

3 years ago

Determine the block of the element Iron which has 26 atomic number:

ziro4ka [17]

Answer:

ok

Explanation:

4 0

3 years ago

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