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3 years ago

If a train travels from San Antonio to El Paso at a speed of 90 mph, how far will it

Chemistry

1 answer:

Minchanka [31]3 years ago

4 0

Answer:it have traveled a total of 315 miles

Explanation: 90 times three because 90 mph times 3 hours=270miles+ the 45 miles from the 30 min times 90 mph=45+ 270=315.

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Can matter be created or<br> destroyed?<br><br> Yes or No

anzhelika [568]

Answer:

Explanation:

The same amount of matter is present before and after chemical and physical changes. Matter cannot be created or destroyed

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3 years ago

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What is the average atomic mass listed for nitrogen in the periodic table?

wel

Average atomic mass listed for nitrogen in the periodic table is 14

Hope this helps!

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3 years ago

Where does ATP store its energy?

RSB [31]

Answer:

D. ATP stores energy in its "tail," which is made from three phosphate groups.

Explanation:

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3 years ago

Can anybody check my answer?

anzhelika [568]

Answer:

$\boxed{\text{25. 20 L; 26. 49 K}}$

Explanation:

25. Boyle's Law

The temperature and amount of gas are constant, so we can use Boyle’s Law.

$p_{1}V_{1} = p_{2}V_{2}$

Data:

$\begin{array}{rcrrcl}p_{1}& =& \text{100 kPa}\qquad & V_{1} &= & \text{10.00 L} \\p_{2}& =& \text{50 kPa}\qquad & V_{2} &= & ?\\\end{array}$

Calculations:

$\begin{array}{rcl}100 \times 10.00 & =& 50V_{2}\\1000 & = & 50V_{2}\\V_{2} & = &\textbf{20 L}\\\end{array}\\\text{The new volume will be } \boxed{\textbf{20 L}}$

26. Ideal Gas Law

We have p, V and n, so we can use the Ideal Gas Law to calculate the volume.

pV = nRT

Data:

p = 101.3 kPa

V = 20 L

n = 5 mol

R = 8.314 kPa·L·K⁻¹mol⁻¹

Calculation:

101.3 × 20 = 5 × 8.314 × T

2026 = 41.57T

$T = \dfrac{2026}{41.57} = \textbf{49 K}\\\\\text{The Kelvin temperature is }\boxed{\textbf{49 K}}$

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3 years ago

Which substance is an electrolyte

Anit [1.1K]

Examples of electrolytes

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3 years ago