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3 years ago

Write in the vocab term for each definition listed. Write your vocab terms in all lower case letters.

Chemistry

1 answer:

anyanavicka [17]3 years ago

5 0

Answer:

1. polar covalent bond

2. electronegativity

3. hydrogen bonding

4. nonpolar covalent bond

Explanation:

1. A type of covalent bond where electrons are shared unequally. polar covalent bond. In this kind of bond, there is a negative charge density over the more electronegative atom and a positive charge density over the less electronegative atom.

2. The tendency of an atom to attract electrons towards itself. electronegativity. Atoms with higher electronegativity have a higher tendency to attract electrons towards itself.

3. A bond that forms between an electronegative atom and a hydrogen atom with a positive dipole. hydrogen bonding. This is an especially strong kind of dipole-dipole interaction.

4. A type of covalent bond where electrons are shared equally. nonpolar covalent bond. Atoms have the same (or similar) electronegativity so the electrons are shared equally.

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Typhoons come from warm waters in the ocean true or fales

lakkis [162]

Answer:

True

Explanation:

A typhoon forms when wind blows into areas of the ocean when the water is warm. These winds collect moisture and rise, while colder air moves in below. This creates pressure, which causes the winds to move very quickly. The wind rotates, or spin, around a center called an eye.

7 0

3 years ago

Read the given expression.

Jlenok [28]

Answer:

Choice number two. The value of "X" in this equation should be constant for all elements across a period.

Explanation:

Electrons are negative while protons are positive. Electrons are attracted to the proton but repel each other.

Consider an atom where electrons occupy more than one energy level. Consider the Bohr Model for that atom. Protons in the nucleus attract the electrons towards the center of the atom. However, at the same time, electrons in the inner shell will repel the valence electrons. That creates an outward force that pushes the valence electrons away from the atom.

The two forces mostly balance each other, but the attraction is slightly stronger. As a result, the overall force on the valence electrons is attractive. The effective nuclear charge gives the number of protons required to produce an attraction of that strength if there was no repulsion at all.

The value of effective nuclear charge is approximately the same as atomic number minus the number of inner-shell electrons. Apparently, the "X" in this question stands for the number of inner-shell electrons.

By the Aufbau Principle, all spots in the inner shell must be filled before more electrons can be added. Additionally, atoms in the same period have the same number of inner shells. As a result, the number of inner-shell electrons will be the same for all atoms in each period. Hence, the value of "X" should stay (approximately) the same across each period.

6 0

3 years ago

You placed 43.1 g of an unknown metal at 100 °C into a coffee cup calorimeter that contained 50.0 g of water that was initially

nika2105 [10]

Answer :

(a) The heat released by the metal is -312.48 J

(b) The specific heat of the metal is $0.0944J/g^oC$

Explanation :

Heat released by the metal = Heat absorbed by the calorimeter + Heat absorbed by the water

$q=[q_1+q_2]$

$q=[c_1\times \Delta T+m_2\times c_2\times \Delta T]$

where,

q = heat released by the metal

$q_1$ = heat absorbed by the calorimeter

$q_2$ = heat absorbed by the water

$c_1$ = specific heat of calorimeter = $51.5J/^oC$

$c_2$ = specific heat of water = $4.184J/g^oC$

$m_2$ = mass of water = 50.0 g

$\Delta T$ = change in temperature = $(T_{final}-T_{initial})=23.2-22.0=1.2^oC$

Now put all the given values in the above formula, we get:

$q=[(51.5J/^oC\times 1.2^oC)+(50.0g\times 4.184J/g^oC\times 1.2^oC)]$

$q=312.48J$

Thus, the heat released by the metal is -312.48 J

$q=m\times c\times \Delta T$

q = heat released by the metal = -312.48 J

m = mass of metal = 43.1 g

c = specific heat of metal = ?

$\Delta T$ = change in temperature = $(T_{final}-T_{initial})=23.2-100=76.8^oC$

Now put all the given values in the above formula, we get:

$-312.48J=43.1g\times c\times 76.8^oC$

$c=0.0944J/g^oC$

Thus, the specific heat of the metal is $0.0944J/g^oC$

8 0

4 years ago

(50 POINTS) HELPPP

Debora [2.8K]

The answer is D, Magnesium.

For an anion or cation(negatively or positively charged ion) to replace a similarly-charged ion, it needs to be more active. This means that only a cation that is above Zinc on the reactivity scale can replace Zinc.

Since Aluminum was displaced in the reaction, that means the unknown metal is more reactive.
This means that our options are:
Lithium, Potassium, Calcium, Sodium, and Magnesium.

But because the metal did not displace the Sodium, it must be less reactive than it.
This gives us a new list of metals that are less-reactive than Sodium:
Magnesium, Aluminum, Zinc, Iron, Nickel, etc.

The only metal on both lists is Magnesium, and that means that your answer is D, Magnesium.

8 0

3 years ago

If you have two peaks in your gas chromatograph, how many compounds are in your sample?

3241004551 [841]

Answer:

Two compounds.

Explanation:

If you have two peaks in your gas chromatograph, this means that you have two compounds.

The gas chromatograph is an instrument that helps identify how many compounds a substance has by observing its behavior against a solid medium through adsorption and the velocity of each compound in it.

7 0

4 years ago