What are the 10 metals?​

Explanation:

Okay this is my last question, please help'

Answer:

C

Explanation:

Took the test on egde

Burning  of wood and coal causes an increases greenhouse gas.

A greenhouse gas absorbs as well as emits radiant energy in the thermal infrared region, resulting in the effect of greenhouse gas . Water vapor, carbon dioxide ([tex]CO_{2}[/tex]), methane([tex]CH_{4}[/tex]), nitrous oxide, and ozone([tex]O_{3}[/tex]) are the principal greenhouse gases in the earth's atmosphere.

Generally, it is known that by burning of wood and coal carbon di-oxide gas will release. Therefore, burning of wood and coal will be responsible for greenhouse gas.

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Answer:

The SI unit of kinetic energy is Joules.

Explanation:

The unit of work done is Joules.

Work done = Force × displacement

For units :

W = N×m

N is newton (unit of force) and m is metre

N = kg m/s²

⇒ W = kg m/s² × m

W = kgm²/s² ....(1)

Kinetic energy of an object is given by :

K = (1/2) mv²

For units :

K = kg× (m/s)²

K = kgm²/s² ....(2)

We know that, kgm²/s² = Joules

From equation (1) and (2), we find that both work done and kinetic energy have same unit i.e. Joules.

Answer

B.

Explanation:

Answer:

false

Explanation:

exothermic are those reactions in which energy is released.so reactant have more energy which transform into product

Answer:

talc mineral and magnetite

Explanation:

Answer:

a. phisical change

Explanation:

Answer:

A

Explanation:

Answer:

C

Explanation:

Answer:

B

Explanation:

The lone pair pushes bonding electron pairs away.

Answer:

B.

Explanation:

Answer:

The answer is ultra violent light

Explanation:

1 mole has 6.023*10^23 molecules

0.6*6.023*10^23=3.6138*10^23 molecules

Answer:

I found:

ν=6×10^14Hz

Explanation:

You can consider that wavelength λ and frequency ν are related through the speed of light in vacuum c as:

c = λ ⋅ ν

so:

3 * 10⁸ = 4.9 * 10-⁷ * V

v =3 *10⁸/ 4.9 *10⁻⁷ = 6 * 10¹⁴HZ

The visible light's wavelengths are: 380–450 nm for violet (688–789 THz frequency) 450–495 nm for blue. Green: nm 495–570. Yellow: nm 570–590.

Make a conversion from wavelength to meters. Divide the wavelength in m by the speed of light, which is 300,000,000 m/s. You can now determine the wave's frequency.

What frequency exists in green light, whose wavelength is 4.90 x 10?

v=6×10^14Hz

Therefore,

Consider how the relationship between wavelength and frequency and the speed of light in a vacuum, c, looks like this:

c = λ ⋅ ν

so:

3 * 10⁸ = 4.9 * 10-⁷ * V

v =3 *10⁸/ 4.9 *10⁻⁷ = 6 * 10¹⁴HZ.

The color that visible light appears in depends on its wavelength. The color of light with the longest wavelength is red, whereas the color with the shortest wavelength is violet. The wavelengths of all the other colours of light are in between. Visible light is divided into its several colours using a prism.

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Answer:

i think it's 3 because there aren't any indexes so that leaves us with one atom of Ca, one atom of O, and one atom of H

The molarity of the HCl solution : 1.052 M

Given

Volume of HCl = 38.55 ml

mass of Na₂CO₃ (MW=106 g/mol)=2.15 g

Reaction

Na₂CO₃(aq) + 2HCl (aq)→ 2NaCl (aq) + CO₂ (g) + H₂0 (l)

Required

The molarity of the HCl solution

Solution

mol Na₂CO₃ :

[tex]\tt mol=\dfrac{mass}{MW}=\dfrac{2.15}{106}=0.02028[/tex]

From the equation, mol ratio Na₂CO₃ : HCl = 1 : 2, so mol HCl :

[tex]\tt mol~HCl=2\times 0.02028=0.04056[/tex]

The molarity :

[tex]\tt M=\dfrac{n}{V}=\dfrac{0.04056}{0.03855~L}=1.052~M[/tex]

Answer:

The amount of energy needed to raise the temperature of 1 g of water by 1 degree Celcius or (1 Kelvin) equals 1 calorie. And 1 calorie equals 4,184 Joule. So if you want to raise the temperature of 1 litre of water (1 litre = 1000g for water) by 80 degrees Celcius, your calculation should look like this: 1000g*4,184J/(g*°C)*80°C= 334 720 Joules

1 kWh = 3 600 000 Joules, because 1 watt of power during 1 second equals 1 Joule. So 3600 seconds in 1 hour multiplied with a power of 1000 Watt equals 3 600 000 Joules.

334 720 / 3 600 000 = 0,093 kWh of energy to heat 1 kg of water from 20 °C tot 100 °C

If you want to deliver 0,093 kWh in 1 minute instead of 1 hour, the required power output during that minute would be 0,093*60 = 5,58 kW or 5580 Watt.

This also passes the common sense test since a regulator water boiler (for coffee etc.) outputs around 1500 to 2000 watt and using such as device to cook a full litre of water takes more than 1 one minute, more like 3 to 4 minutes which is to be expected if you go through the math.

The equation represents calcium carbonate (CaCO3) breaks down to form calcium oxide (CaO) and carbon dioxide (CO2) chemical reaction will be

CaO + CO2 → CaCO3.

A chemical reaction occurs that results in the chemical change of one number of chemical components into another set of organic compounds.

A chemical equation is just a description of a chemical reaction in symbols that indicates the products, reactants, but also reaction direction.

Calcium carbonate dissociate into calcium oxide and carbon dioxide.

It can be expressed as CaO + CO2 → CaCO3.

Therefore, the correct answer will be option (A).

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Answer:

Explanation:

(a) Answer: Intermolecular forces

The reason for this answer is because the substance (paraffin wax) only changed it's state from solid to liquid and didn't undergo a breakage in it's covalent bond within it's carbon chain which would have produced another substance.

(b) Solid substances are generally more dense than there corresponding liquid substances because the more compact particles are (which occurs in solids), the more dense they become. They are thus more dense than liquids because liquids have there particles loosely packed and well spaced making them less dense than there corresponding solids. Hence, the solid paraffin wax was going to become less dense because it's particles moved from being tightly packed (as solids) to being loosely packed (as liquids). Density refers to mass per volume but can also be described as the level of compactness of a substance. Thus, since liquid is not as compact as solid, it can be said to be less dense than solids.

Answer:

it is d or b hope this help

Answer:

A

Explanation:

Answer:

I think false

Explanation:

It might be false because bacteria can be found on hard/soft surfaces, in our bodies, in the ground, and in the air.

Answer:

The reactants for photosynthesis are light energy, water, carbon dioxide and chlorophyll, while the products are glucose (sugar), oxygen and water.

Answer:

When you heat up water, the water molecules start moving around faster and faster. They bounce off each other and move farther apart. Because there's more space between the molecules, a volume of hot water has fewer molecules in it and weighs a little bit less than the same volume of cold water. So hot water is less dense than cold water. When you put the two together with the hot water on the bottom, the hot water rises to the top, mixing with the cold water along the way and creating purple water.

Explanation:

Why doesn't the water mix when the hot water is on top?

When the cold water is on the bottom, the hot water doesn't have to rise--it's already on top. The cold blue water stays on the bottom and the hot red water stays on top.

When the hot water and cold water are mixed together, heat transfer takes place by conduction.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .

When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

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Answer:

Its A, C and D

Explanation:

A= correct because when you add heat to a solid it starts to melt and turn to liquid

B= Incorrect because the more heat that's dded the faster the atoms in the object will move and that creates energy

C= Correct because the liquid is in fact changing to a gas as more heat is added.

D= Correct because as i explained in B the more heat added the more energy is there

Answer:

Answer:

D

Explanation: I guess