An atom has 30 protons, 30 neutrons, and 30 electrons. What is the charge of the atom’s nucleus?
A: +30
B: +60
C: -30
D: -90

Answer: Aluminium

Explanation:

The metals are solid substances, they have shiny luster, they conduct electricity and have high melting point. The aluminium is a kind of metal that have a solid surface, it has a shiny luster, the surface of metal appears to be polished. It conducts electricity and can be used in electrical cords, connections, and devices. It has a high melting point.  

Answer:

chemical energy

Explanation:

cordless power saw has rechargeable battery attached to it.

and we know storage energy in battery is chemical hence cordless power saw has chemical energy present in it.

When the saw is operated, the chemical energy is converted into electrical energy which causes the motor fitted in power saw to move.

Thus,

in cordless power saw

chemical energy is converted into electrical energy

electrical energy is converted into mechanical energy.

Answer:

I think the answer is EROSION because it has to do with the movement of sediment.

Explanation:

Hope this helps!

Flood waters moving soil from one location to another is called erosion.

Erosion is the process by which soil, rock, and other materials are transported from one place to another by natural forces such as water, wind, and ice.

Therefore, the movement of soil from one location to another due to flood waters is an example of erosion.

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Without doing research before doing an experiment you’d be at risk, example: Chemical reactions that COULD cause chemicals burning through human skin, or setting off an harmful explosion by mixing unknown chemicals together.

Answer: the data are inadequate .

Explanation:

Answer:

tRUE

Explanation:

Answer: 207.217 amu

Work:

203.973 amu *(0.014) = 2.855 amu

205.974 amu *(0.241) = 49.639 amu

206.976 amu *(0.221) = 45.741 amu

207.977 amu *(0.524) = 108.979 amu

2.855 + 49.639 + 45.741 + 108.979 = 207.217amu

Explanation:

The average atomic mass has been defined to be the total mass given by the relative abundances and masses of the isotopes. The average atomic mass of lead is 204.359 amu.

The average atomic mass has been given by the masses and relative proportions and abundances of the isotopes of the elements that differ from the mass of the element in the periodic table. It is the average mass given by the sum of the masses and the abundances.

Given,

Abundance of lead-206 = 24.1%

The abundance of lead-207 = 22.1%

The abundance of lead-208 = 53.8%

Mass of lead-206 = 205.974 amu

Mass of lead-207 = 206.976 amu

Mass of lead-208 = 207.977 amu

The average atomic mass is given as:

= (205.974 × 0.241) + (206.976 × 0.221) + (207.977 × 0.524)

= 49.639 amu + 45.741 amu + 108.979 amu

= 204.359 amu

Therefore, 204.359 amu is the average atomic mass.

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Answer:B

Explanation:

Answer:

+2

Explanation:

The nitrate ion is a radical with an overall charge of -1. To get the oxidation number of lead, add up all the oxidation numbers and equate to zero. Therefore the oxidation state of lead is +2.

Answer:

+2

Explanation:

looked it up

Answer:

No.

Explanation:

If the forces are acting on opposite direction, they will cancel out each other. As a result, the object will not move. This type of force is called balanced force. In this type of force the net force acting on an object is equal to 0. Hence, if two groups in the game are exerting equal and opposite force, the rope will not move.

Answer:

carbohydrate yam rice

Answer:

3

Explanation:

conduct experiment on live animal is not human way so it's a question of morality...

Answer:

i think you forgot to add a picture

Answer:

Answers with the explanation.

Explanation:

Surprisingly all of the answers were C for some reason:

14. C (Extensive Properties include mass, volume and length)

15. C (Boiling/Melting/Freezing point are examples of physical change)

16. C (Malleability is how bendable an object is, therefore a physical change)

17. C (For Example, Water only forms Water Vapor when it´s heated up)

Answer:

1.F

2.A

3.C

4.E

5.B

6.D

7.B

8.F

9.A

10.E

11.D

12.C

13.B

14.C

15.C

16.C

17.C

Explanation:

Answer:

When two or more waves meet, they interact with each other. The interaction of waves with other waves is called wave interference. Wave interference may occur when two waves that are traveling in opposite directions meet. The two waves pass through each other, and this affects their amplitude

Explanation:

hope this helps!

Hello

Answer:

C. C3H8

Hope this help you;)))

Considering the definition of molar mass, the mass of 4.02 mol Ba(NO₂)₂ is 921.9468 grams.

Molar mass is the mass of one mole of a substance, which can be an element or a compound.

Therefore, knowing the molar mass, the mass can be calculated using the expression:

mass= moles× molar mass

In the periodic table, you can find the molar mass of the elements, also called atomic mass or atomic weight.

To calculate the molecular mass of a compound, also called mass or molecular weight, you must add the molar mass of the elements of the compound multiplied by the number of atoms of each element that make up the compound.

In this case, being the atomic mass:

The molecular mass of Ba(NO₂)₂ can be calculated as:

Ba(NO₂)₂= 137.34 g/mole× 2× (14 g/mole +2×16 g/mole)

Ba(NO₂)₂= 229.34 g/mole

Then, the mass of 4.02 mol Ba(NO₂)₂ can be calculated as:

mass= 4.02 moles× 229.34 g/mole

mass= 921.9468 grams

Finally, the mass of 4.02 mol Ba(NO₂)₂ is 921.9468 grams.

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Answer:

the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

Explanation:

density= mass/ volume

d= 20/5

d= 4 g/cm^3

Answer:

B. Evidence

Explanation:

Answer:

14,250 years old.

Explanation:

First, multiply the two lifetimes. - 11,400.

Then, divide 5,700 in half for the 0.5 lifetime. - 2,850.

Lastly, add them all up. - 11,400 + 2,850 = 14,250 years old.

sorry if incorrect <3

thats what i understood XD

Answer:

A. Physical Change

Explanation:

Physical change is a type of change in which no new substance is formed, change of state can occur, the appearance of matter can be altered but not its chemical component.

Molten steel being poured into molds to make car parts and then allowed to cool and harden is an example of Physical change because;

-  A change of state only occured from molten steel to solid steel.

- No new substance is formed.

When paper is burned, the mass of the remaining ash is less than the mass of the original paper because Some of the products of the reaction were given off as a gas.

The postulate of the law of conservation of mass is that mass can not be created or destroyed rather it can be transformed from one form to another.

This means that when ash is left behind after burning paper, the total mass should be the same as was obtained before combustion but it rather weighs less than paper itself. This should never be interpreted to mean that mass was "lost".

Here is what happens, paper is an organic material and burning it in air yields CO2 gas which escapes into the atmosphere. This explains why; when paper is burned, the mass of the remaining ash is less than the mass of the original paper.

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