Which region contains elements with five valence electrons ?

Answer:

1s2 2s2 2p6 3s2 3p6 4s2 3d6

Explanation:

Answer:

Fluorine

Explanation:

Answer:

Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.

Answer:

chemical weathering occurs on the surface of minerals, the water and acids that control chemical weathering require access to the surface. Physical weathering breaks the rock to provide that surface

Answer:

smoother and less jagged

Explanation:

Answer:

according to me option a is the correct one

Burrows, tracks, coprolites, nests and footprints are examples of traces that can be found in a fossil.

Answer: Trade winds!

Explanation:

The mass of boy weighing 270 N has been 27.55 kg.

The mass of the object has been determining the quantity of the matter, while weight of the object has been the mass with the gravitational pull.

The weight of the object has been given as:

Weight = mass × gravitational constant

Weight of boy = 270 N

Gravitational constant = 9.8

The mass of boy is:

270 = mass × 9.8

[tex]\rm Mass\;=\;\dfrac{270}{9.8}[/tex]

Mass = 27.55 kg.

The mass of boy weighing 270 N has been 27.55 kg.

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Answer:

The Answer would be D. N2O3

Explanation:

the Chemical bond is a Covalent bond to which the prefixes are Di and tri

Answer:

[tex]\boxed {\boxed {\sf A. \ 19,320 \ kg/m^3}}[/tex]

Explanation:

We want to find the density. The formula is mass over volume.

[tex]\rho = \frac{m}{v}[/tex]

The mass is 500 kilograms. The volume is 0.026 cubic meters.

[tex]m= 500 \ kg \\v=0.026 \ m^3[/tex]

Substitute the values into the formula.

[tex]\rho= \frac{ 500 \ kg}{ 0.026 \ m^3}[/tex]

Divide.

[tex]\rho = 19230.7692 \ kg/m^3[/tex]

This is just about equal to 19,320 kg/m³, so choice A is correct.

Answer:

A) 19230 kg/ m3

Explanation:

divided it's mass by its volume ti get it's density

500/0.026 = 19230

Answer:

There is more space in a balloon with less gases meaning it can move around a lot faster

Explanation:

Answer:

It could lead to Fatigue

Low energy.

Headaches.

Aches, pains, and tense muscles.

Chest pain and rapid heartbeat.

Explanation:

If a construction worker consumes 18000 KJ of energy on a daily basis, this could lead to adverse effects such as fatigue, headaches, aches, tense muscles, chest pain, and rapid heartbeat.

The NHS advises a man who is working at a construction site to eat 2,500 calories, and women to eat 2,000 calories, on daily basis. On an average, construction workers such as women should have around 2,000 calories a day which carries about 8,400 kilojoules and men should have around 2,500 calories a day which is about 10,500 kilojoules.

The best diet for a construction worker include foods such as grain, vegetable, fruit, dairy product, lean meat, seed, and fats for the maintenance of a healthier condition.

If a construction worker is taking 18000 KJ of energy in diet which is almost 8000 KJ more than the required amount then in this case, the worker may have fatigue, headaches, aches, tense muscles, chest pain, and rapid heartbeat.

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Answer:

Nitrogen

Explanation:

because a rule i use called the "en,ne" rule

Any element that ends with this is diatomic

Cold water causes a strong reaction between all alkali metals. Each reaction results in the release of hydrogen gas and the production of metal hydroxide.

The six chemical elements that make up Group 1 ( Ia ) of the periodic table—lithium ( Li ), sodium ( Na ), potassium ( K ), rubidium ( Rb ), cesium ( Cs ), and francium—are together referred to as alkali metals ( Fr ). The name "alkali metals" refers to how they react with water to produce alkalies.

The elements in Group 1 are all extremely reactive. To protect them against air and water, they must be kept under oil when being stored. Group 1 elements produce alkaline metal hydroxides when they interact with water (with a pH above 7). They are known as "alkali metals" for this reason.

Thus, the elements in group 1 react with water to form a hydroxide and hydrogen gas is produced.

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Answer: O D. It bonds with the added H+ or OH in solution.

Explanation:

Answer:

[tex]\boxed {\boxed {\sf B. \ Iodine }}[/tex]

Explanation:

Atomic radius is the measurement from the nucleus to the outer edge of the electron cloud.

As you go down a group (vertically) the atomic radius increases because more electron shells are added. As you go across a period horizontally, the atomic radius decreases.  

If we look at the halogens group (17), we see they follow this order from top to bottom:

F - Fluorine

Cl - Chlorine

Br - Bromine

I - Iodine

Since it increases down the group, iodine  must have the largest atomic radius.

Answer:

They mask the recessive alleles

Answer:

C

Explanation:

Please see the attached picture for the explanation.

Le Châtelier's principle:

When a stress is applied to a system at equilibrium, the system will respond by shifting in the direction that opposes/ minimizes the effect of the stress.

• This stress could be the addition or removal of a product or reactant, changes in the concentration of the products or reactants, or a change in temperature.

☆ Why can heat be written on the same side of the products when the reaction is exothermic?

• Exothermic means that heat is released, thus heat can be treated as a product.

• I like to remember it as Exothermic → Exit

Answer:

Gravity

Explanation:

i dont rlly know where it comes from...

Answer:Land Population

Answer:

Option D.

Explanation:

Let's balance the hole reaction by the ion electron method.

Al (s) + Cr(NO₃)₂ (aq) – Cr (s) + Al(NO₃)₃ (aq)

We know that oxidation state at ground state is 0.

We determine the half reactions:

Al  ⇆   Al³⁺  +  3e⁻

Aluminum increase the oxidation state. This is the oxidation.

Cr²⁺ + 2e⁻  ⇄   Cr

Chromium decrease the oxidation state. It changed from +2 to 0.

This is the reduction. In order to balance the half reactions, we need to multiply by 2 and by 3. In that way, we can cancel the electrons:

(Al  ⇆   Al³⁺  +  3e⁻) . 2

(Cr²⁺ + 2e⁻  ⇄   Cr) . 3

We sum the half reactions:

2 Al + 3 Cr²⁺  +  6e⁻  ⇄  2Al³⁺  +  6e⁻ + 3Cr

We cancel the electrons, so now the balanced reaction is:

2Al + 3Cr(NO₃)₂  →  3Cr  + 2Al(NO₃)₃

Final answer: 6 electrons are transferred in the redox reaction.

Answer:

2NaOH

Explanation:

Answer:

B

Explanation:

Blue triangles are a cold front and red bowls are warm front

Stationary front is a combination

HOPE I helped :]

Answer:

stationary front

Explanation:

on a weather map, a stationary front is shown as alternating red semicircles and blue triangles like in the image at the left. notice how the blue triangles point in one direction, and the red semicircles point in the opposite direction.

Answer:

Explanation:

42.32

Hope this helps sorry if wrong

Explanation:

D) chlorine kills most pathogens in water.