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3 years ago

A reaction is occurring in a test tube. How is heat transmitted to the surroundings?

1 answer:

8 0

It should be noted that when a reaction is occurring in a test tube, heat transmitted to the surroundings when Molecules collide with the glass, and the glass molecules then transmit that energy to the outside.

Heat can be regarded as a form of energy which is energy that is been transferred as a result of difference in temperature.

In the case above, Molecules collide with the glass, and the glass molecules then transmit that energy to the outside which is an exothermic reaction.

Therefore, option B is correct.

Learn more about heat at:

brainly.com/question/12072129

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A sample of barium nitrate is placed into a jar containing water. The mass of the barium nitrate sample is 27g. Assume the water

34kurt

So we have Barium nitrate with a solubility of 8.7g in 100g water at 20°C.

using that relation
i.e.
8.7g (barium nitrate) =100g (water)
1g barium nitrate = 100/8.7 g water

27g barium nitrate = (100/ 8.7 ) × 27
= 310.34 g

therefore,
you need 310.34g of water is in the jar.

5 0

3 years ago

Read 2 more answers

I'm trying to do question number 2.56

Lunna [17]

The answer is in the picture which is given below:

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3 years ago

The atomic mass of helium-4 is 4.0026 amu. How many of each

umka21 [38]

Answer:

Protons: 2.

Electrons: 2.

Neutrons: 2.

Explanation:

Hello,

In this case, since an atom's atomic number is equal to the number of electrons, considering the electron configurations, taking into account that helium-4 is neither positively nor negatively charged, we can infer that the number of electrons equal the number of protons, which in this case are 2, due to the fact that is atomic number is 2.

Moreover, as helium-4's atomic number is 4 as a whole number, we compute the number of neutrons by using the shown below equation:

$Neutrons=mass\ number-atomic\ number\\\\Neutrons=4-2\\\\Neutrons=2$

Regards.

7 0

3 years ago

Is thiamine mononitrate an ionic bond or covalent bond?

timofeeve [1]

It is a covalent bond. Whenever a compound uses such suffixes like mono, di, tri, tetra, and so on, it is a covalent compound- thus having covalent bonds.

7 0

3 years ago

Read 2 more answers

Help asap. <br>How many moles are 5.55x10^25 atoms of Mg

LekaFEV [45]

Answer:

$\boxed {\boxed {\sf About \ 92.2 \ moles \ of \ Magnesium}}$

Explanation:

To convert from atoms to moles, we must Avogadro's number:

6.022*10²³

This number tells us the amount of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case, it is atoms of magnesium in 1 mole.

6.022 *10²³ atoms Mg / 1 mol mg

Now, let's set up an expression using:

$\frac {6.022 * 10^ {23} \ atoms \ Mg}{ 1 \ mol \ Mg}$

Multiply this by the given number of atoms.

$5.55*10^{25} \ atoms \ Mg *\frac {6.022 * 10^ {23} \ atoms \ Mg}{ 1 \ mol \ Mg}$

Flip the fraction so the atoms of magnesium can cancel.

$5.55*10^{25} \ atoms \ Mg *\frac { 1 \ mol \ Mg }{6.022 * 10^ {23} \ atoms \ Mg}$

$5.55*10^{25} *\frac { 1 \ mol \ Mg }{6.022 * 10^ {23}}$

Multiply and condense this into 1 fraction.

$\frac { 5.55*10^{25} \ mol \ Mg }{6.022 * 10^ {23}}$

$92.1620724 \ mol \ Mg$

The original measurement had 3 significant figures, so our answer must have that many as well. For the number we calculated, that is the tenth place. The 6 in the hundredth place tells us to round the 1 to a 2.

$92.2 \ mol \ Mg$

It is about <u>92.2 moles of magnesium.</u>

3 0

3 years ago