The last question i need help on and can you explain please? On D

Answer:

B. They travel at the same speed through any one material.

Explanation:

Answer:

1 & 3

Explanation:

Elements have similar chemical and physical properties if and only if they belong to the same group of elements in the periodic table.

A group of elements in the periodic table is a family of elements, the elements in the in the same group have the same number of valence electrons in their outermost shell, share similar chemical reactivity (with slight variation within the group) and similar physical properties  (with slight variation within the group).

Magnesium, radium, beryllium and barium all belong to group 2 hence they have similar chemical and physical properties.

Answer:

455.4 mmHg

Explanation:

To solve this problem we can use Gay Lussac's Law, which describe the temperature and pressure of a gas, at constant volume and composition:

In this case:

We input the data:

And solve for P₂:

A

Because Aluminum atoms tend to lose electrons in order to achieve an insert gas configuration. The aluminum atoms need to lose 3 electrons in order to attain the neon configuration , so it forms a trip of positive action

Answer:

Aluminium & Phosphorus (C & D)

Explanation:

Both these elements need to form positive ions with a +3 charge as they need to lose their 3 electrons to form a stable state in their configuration.

Answer:

unbalanced

hope this helps

Answer:

Yes

Explanation:

A small part of the correspondence is due to the relationship between temperature and the solubility of carbon dioxide in the surface ocean, but the majority of the correspondence is consistent with a feedback between carbon dioxide and climate.

Answer:

1,crust

2, mesosphere

3,Inner core

4,Outer core

5, Mantle

Answer:

50g

Explanation:

pls mark me brainliest right

Answer:

Uranium is produced by mining deposits of this mineral found in earth's crust

Answer:

They will stay too hot.

Explanation:

You would burn yourself on the mug and your drink would be too hot to drink.

Answer:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Explanation:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Answer:

Red is the lowest.

Explanation:

Answer: With this tool, the

✔ copper

could be

separated from the

✔ aqueous solution

.

Explanation:

EDU 2021

Answer:

Electrolytes, particularly sodium, help the body maintain normal fluid levels in the fluid compartments because the amount of fluid a compartment contains depends on the amount (concentration) of electrolytes in it. If the electrolyte concentration is high, fluid moves into that compartment (a process called osmosis).

Explanation:

Answer:

Electrolytes are minerals in your body that have an electric charge. They are in your blood, urine, tissues, and other body fluids. Electrolytes are important because they help

Balance the amount of water in your body

Balance your body's acid/base (pH) level

Move nutrients into your cells

Move wastes out of your cells

Make sure that your nerves, muscles, the heart, and the brain work the way they should

Sodium, calcium, potassium, chloride, phosphate, and magnesium are all electrolytes. You get them from the foods you eat and the fluids you drink.

The levels of electrolytes in your body can become too low or too high. This can happen when the amount of water in your body changes. The amount of water that you take in should equal the amount you lose. If something upsets this balance, you may have too little water (dehydration) or too much water (overhydration). Some medicines, vomiting, diarrhea, sweating, and liver or kidney problems can all upset your water balance.

Treatment helps you to manage the imbalance. It also involves identifying and treating what caused the imbalance.

the one main difference between a hurricane and a typhoon is the specific location where the storm takes place!!

typhoons and hurricanes can reach sustained winds of an averaging 74 mph.

Answer:

0.5 mole of H₂.

Explanation:

We'll begin by calculating the number of mole in 23 g of Na. This can be obtained as follow:

Mass of Na = 23 g

Molar mass of Na = 23 g/mol

Mole of Na =?

Mole = mass / Molar mass

Mole of Na = 23 / 23

Mole of Na = 1 mole

Next, the balanced equation for the reaction.

2Na + 2H₂O —> 2NaOH + H₂

From the balanced equation above,

2 moles of Na reacted to produce 1 mole H₂.

Finally, we shall determine the number of mole of H₂ produced by the reaction of 23 g (i.e 1 mole) of Na. This can be obtained as follow:

From the balanced equation above,

2 moles of Na reacted to produce 1 mole H₂.

Therefore, 1 mole of Na will react to produce = (1 × 1) / 2 = 0.5 mole of H₂.

Thus, 0.5 mole of H₂ is obtained from the reaction.

Answer:

we find the mass for each element in one mole by multiplying the number of atoms in one molecule with the atomic mass

mC=8Ac=8*12=96g

mH=10AH=10*1=10g

mN=4AN=4*14=56g

mO=2AO=2*16=32g

by adding the masses together we find the molar mass of the molecule

M=mC+nH+mN+mO=96+10+56+32=194g/mole

we apply the rule of threes to find the percentage of each element

194g..96gC..10gH...56gN....32gO

100g....a...........b...........c.............d

a=(100*96)/194=49.48%C

b=(100*10)/194=5.19%H

c=(100*56)/194=28.85%N

d=(100*32)/194=16.48%O

Explanation:

Answer: I think they get will paralysed and some of the impulses may not be able to get through.

Explanation:

The relative formula mass of a substance, shown in grams, is called one mole of that substance. So one mole of carbon monoxide has a mass of 28 g, and one mole of sodium oxide has a mass of 62 g

Answer:

M(CO)=28 (g/mol)

Explanation:

M= 12+16=28 (g/mol)

1) We know that rtp = number of moles × 24

                                 = 0.25 × 24

                                 = 6 dm³

Therefore the volume of 0.25 moles of gas at rtp is A) 6 dm³

3.1) Amount of Copper = 20 tonnes

Amount of pure copper from impure copper = 18 tonnes

Purity of copper = (Pure copper/ impure copper) × 100

                           = (18 / 20) × 100

                           = 18 × 5

                           = 90 %

Therefore the purity of copper is 90%

3.2) We know that oxygen has 8 protons and 8 neutrons, so the weight of oxygen molecule is 8 + 8 = 16 u

So, one mole of oxygen weighs 16 g, so 2 moles weigh 2 × 16 = 32 grams

But oxygen is diatomic so the weight is 32 × 2 = 64 grams

Therefore the weight of 2 moles of oxygen is 64 grams

3.3) Concentration of solution = Amount of solute/volume

                                                   = 4 moles/ 2 dm³

                                                   = 4 / 2

                                                   = 2 mol/dm³

Therefore the concentration of a solution containing 4 moles in 2 dm³ of solution is 2 mol/dm³

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Extremely sorry for the late answer

Answer:

Natural resources are the resources that are available in the nature. There is no human involvement in the production or manufacture of the natural resources. These resources helps in adding capital and growth to the development of the country. Natural resources are found in abundance but they are non-renewable resources. This means that it takes millions of years for their formation. Once exhausted, their replacement would became very difficult. Conversation of the natural resources has been one of the global action. Developed nations are equipped to find ways by which natural resources can be saved and used in a way that they do not extinguish. Many alternative methods and techniques have been adopted to preserve them. Natural resources like oil, gold and coal are performed after going through a process of many years. Hence, there replacement becomes very challenging and difficult respectively.

Answer:

A.) Longer and Shorter

Explanation:

If the wavelength of a light wave is shorter that means the frequency will be higher.

That means that longer wavelengths have a lower frequency.