3 years ago

Need help for number 4. do i use the q=mc DELTA T equation or the q=mHfusion?

Chemistry

1 answer:

Natasha2012 [34]3 years ago

7 0

Since it is a phase change, use the mHfusion equation.

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Kendra and Jordan gather firewood. The wood is cool to the touch, but the campfire they make warms their hands. Which statement

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Answer:

Explanation:

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3 years ago

One isotope of oxygen differs from another isotope of oxygen in *

Reptile [31]

Each isotope of Oxygen has a different number of neutrons

<h3>Further explanation </h3>

The elements in nature have several types of isotopes

Atomic mass is the average atomic mass of all its isotopes

Isotopes are atoms has the same number of protons but has a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

Some of the isotopes of oxygen are:

$\tt _8^{16}O,_8^{17}O,_8^{18}O$

Each isotope has 8 protons and 8 electrons but has a different number of neutrons

For O-16: number of neutrons = 16-8 = 8

For O-17: number of neutrons = 17-8 = 9

For O-18: number of neutrons = 18-8 = 10

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3 years ago

3. A girl<br> ran 105 metres in 15 seconds. What was her speed

sweet [91]

Answer:

7 meters per second was her speed

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2 years ago

Answer will mark bl plz

lesya692 [45]

Answer:

Explanation:

The mallet transfers kinetic energy, then that energy is transferred to the orange ball, then the purple ball, thus making the purple ball move

3 0

4 years ago

What is the concentration of H+ ions at a pH = 11?

natta225 [31]

Answer:

$\huge 1 × {10}^{-11} \: \: M$

Explanation:

The pH of a solution can be found by using the formula

$pH = - log [ {H}^{+} ]$

Since we are finding the H+ ions we find the antilog of the pH

So we have

$11 = - log({H}^{+}) \\ {H}^{+} = {10}^{ - 11}$

We have the final answer as

$1 × {10}^{-11} \: \: M$

Hope this helps you

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3 years ago