All categories

3 years ago

Help me pls

Chemistry

1 answer:

harkovskaia [24]3 years ago

3 0

Answer:

this is answers to the second picture

Explanation:

1- energy

2- structure

3- reaction

4- substance

5- reactants

6- products

7- changed

8- At first there is no reaction because of the protective oxide coating on the aluminum. But soon an exothermic reaction between bromine and aluminum causes brown fumes of bromine to be given off. But as a new substance, aluminum bromide is produced. White smoke is produced.

9- heated to 120 degrees Celsius it melts and first forms a pale-yellow liquid.

In this form the atoms are covalently bonded, and the liquid can flow easily. However, heated up beyond 150 degrees Celsius, the result is a dark red

10- When a chemical change occurs it is more difficult to revert the substance back to its original state. (To be honest I don't know)

You might be interested in

Which of the following lists the characteristics that all matter has?

motikmotik

It has mass and takes up space is correct.

5 0

3 years ago

Read 2 more answers

Partial charges will exist on each atom when a bond exists between two atoms with different electronegativities. Since the atom

lana66690 [7]

Answer:

negative, positive, increase

Explanation:

From the given question,

During the formation of bond, between two atoms with difference between their electronegativity-

The more electronegative atom, will pull the electrons towards itself , and hence acquires a partial negative charge,

And,

The less electronegative atom, will acquire a partial positive charge.

The more the difference between the electronegativity of the atoms, the more would be the magnitude of partial charge.

And, the less would be the difference between the electronegativity of the atoms, the lesser would be the magnitude of partial charge.

7 0

3 years ago

2. How many molecules are contained in 25 L of N₂ at S. T.P.?

irina [24]

Explanation:

How many nitrogen molecules are in 1 liter of nitrogen gas at STP?

Answer

Request

Details

Ad by Amazon Web Services (AWS)

Build low-cost web applications with AWS.

You can use whatever CMS you like, including WordPress, Drupal, and more. Get started for free.

All related (34)

Recommended

Pete Gannett

Ph.D. Chemistry, University of Wisconsin-Madison, (1982)2y

Seems to be an ideal gas law question. The relevant equation is:

PV = nRT

where P is the pressure in atmospheres, V is the volume in liters, n is the number of moles of gas, R is the gas constant (0.082 atm-L/mole-deg K), and T is temperature in Kelvins. STP means standard temperature and pressure and this is taken as 1 atm and 0º C or 273 K.

To calculate the number of molecules we will use the constant 6.023 * 10^23 molecules/mole and, therefore, we will need to know the number of moles (n). So, first we’ll rearrange the gas law equation, isolating ’n’ and then put the numbers in.

n = PV/RT = 1 * 1 / (0.082)(273) = 0.0447 moles

So, to calculate the number of molecules, multiple this by the number of molecules in a mole and you get:

# molecules of nitrogen in 1 Liter at STP = 6.023 * 10^23 molecules/mole * 0.0447 moles = 2.6905 * 10^22 molecules

Note, it does not matter what the gas is.

6 0

2 years ago

Read 2 more answers

PLZ HELP!!

Nataly [62]

A and B are experiencing winter. The picture which isn't available here in this question is attached below.

Option C.

<h3><u>Explanation:</u></h3>

The earth is tilt by an angle of 23.2° to the vertical plane. This makes the seasonal variation of earth, because in some time of the year, the northern hemisphere faces the sun directly, experiencing summer and then southern hemisphere is away from summer experiencing winter and vice versa. The summer occurs when the place directly faces the sun. And the winter happens when the place obliquely faces the sun or doesn't face the sun at all.

Here in this diagram, we can see that the points A and B are the north pole and the part in northern hemisphere respectively which aren't facing the sun directly, whereas C and D are facing the sun. Thus the southern hemisphere is experiencing summer and the northern hemisphere the winter.

4 0

3 years ago

Which of the following are peninsulas in Southeast Asia?

xxTIMURxx [149]

Answer:

Explanation:

5 0

3 years ago