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Answer:

C.

Explanation:

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.

Answer:

C, since matter cannot be created or destroyed the same number of particles must be present on both sides of the equation. Hence why all chemical reactions must be balanced.

Explanation:

Answer:

diamagnetic -415.5 degrees F so yea on the magnetic part

Explanation:

Answer:

[tex]3.2\times 10^{-18}\ C[/tex]

Explanation:

No of electrons, n = 20

We need to find the total charge. We can use quantization of electric charge in this case.

Net charge,

q = ne

e is charge on an electron

[tex]q=20\times 1.6\times 10^{-19}\\\\q=3.2\times 10^{-18}\ C[/tex]

So, there are [tex]3.2\times 10^{-18}\ C[/tex] of charge in 20 electrons.

Answer:

gravity

Explanation:

hope this belps

The space objects fall to earth because of the gravitational force of the earth. Earth pulls all objects towards itself by gravity.

Every object and person in their respective locations can be attributed to the force of gravity. It lends an object weight. Everyone will be floating in the air if there is no gravity.

Differing locations experience different levels of gravity. Similar to the earth, there is a strong gravitational pull. There is the less gravitational pull on the moon. In mars, there is less gravitation force than on earth.

The gravitational force pulls all objects towards itself, that is why if an object from space falls, it falls towards the earth. The gravitational force is very high on Earth.

Thus, due to gravity on earth, all space objects fall to earth.

To learn more about gravity, refer to the below link:

https://brainly.com/question/12054584

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Answer:

three cubic centimeters  

Explanation:

Answer:

7.20 kg/L

Explanation:

Density is mass (kg) / volume (L).

18.00kg/2.50L = 7.20 kg/L

If you need it in g/mL this is the equation:

[tex]\frac{7.20kg}{L} *\frac{1000g}{1kg} *\frac{1L}{1000mL} = 7.20g/mL[/tex]

Answer: 0.0556555468903552 moles, you can estimate that to its nearest hundreth, or thousandth.

Explanation:

im just naturally a genius

Answer:

B i hope this helped!

Explanation:

Answer:

poles

Explanation:

Answer:

SAme. What's le question, I will answer correctly.

Explanation:

Answer:

You have to push a shopping cart with more force than an empty shopping cart.

Explanation:

Hope this helps! Plz vote brainliest

Explanation:

In solids, the particles are tightly packed together. In liquids, the particles have more movement, while in gases, they are spread out. Particles in chemistry can be atoms, ions or molecules. It is important to understand the particle nature of matter.

Answer:

hola, tuve que usar el traductor de google en esto. Ni siquiera sé si entenderás esto, pero vale la pena intentarlo. y la cuestión es que no tengo la respuesta a esto, pero tenía ganas de responder en español :) por favor, responda en español para que pueda responder con una respuesta en español porque ¡esto es divertido! Esta es la tercera respuesta en español que he hecho esta noche y no tengo la intención de detenerme ahora. Sin embargo, me estoy quedando sin cosas que decir. jaja

Explanation:

Answer:

False

Explanation:

Mixtures are a solute and solvent that are not chemically combined, therefore easily separated. Solutions are a solute and solvent combined together.

Answer:

the answer is burning a match

Explanation:

when you break glass, the  properties of glass is still the same, melting ice and boiling water are both phyisical changes since they are chnages in state.

woo burning is a type of combustion reaction and when we light a match, matches include different chemicals that help to ignite it with friction so its A, burning a match

Answer:

A. burning a match on edge 2021

Answer:

Chitin

Explanation:

A fly's main body is made of a thorax and an abdomen. These parts are covered by a hard exoskeleton made of a bony substance called chitin.

The exoskeleton of a housefly is made up of chitin. Thus, the correct option for this question is B.

The Exoskeleton may be defined as a tough and rigid external covering present in some invertebrate animals like arthropods. It supports and protects the animals with respect to their external environment.

The main body of a housefly is significantly divided into two regions, i.e. a thorax and an abdomen. The thorax region is further divided into three parts i.e. prothorax, mesothorax, and metathorax.

All these parts of a housefly are remarkably covered by a tough exoskeleton that is constructed of chitin. The housefly has a hard exoskeleton that protects it from moisture loss.

Therefore, the exoskeleton of a housefly is made up of chitin. Thus, the correct option for this question is B.

To learn more about Exoskeleton, refer to the link:

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Answer:

λ= 4.99 * 10^-17

Explanation:

C= F * λ

F= frequency(Hz)

λ= wavelength(m)

C= 3.0 * 10^8

F= 6.01 * 10^24

λ= ?

3.0 * 10^8= (6.01 * 10^24) λ

***Simplify

λ= 4.99 * 10^-17

Answer:

pyroclastic flow. a superheated cloud of gas and volcanic ash that travels swiftly down a volcanic slope. What is a bowl-shaped crater thought to be caused by the collapse of an empty magma chamber? caldera.

Explanation:

google

can I gave brainliest

Answer:

B. Hypothese

Explanation:

Answer:

B.Hypothese

Explanation:

i don't know but that's first came in my mind

Stirring affects how quickly a solute dissolves in a solvent, but has no effect on how much solute will dissolve. The amount of solute that will dissolve is affected by temperature - more will dissolve at higher temperatures. This is called the solubility of the solute

Answer:

-8

Explanation:

Answer:

to make sure that you change one factor at a time while keeping all other conditions the same.

Explanation:

Answer:

A test with the same control variable

Explanation:

Say you're testing mentos and coke, you have to use the same type of mentos and coke to keep it fair. the only thing you change is the independent variable which would be the number of mentos in this case.

Answer:

The larger the difference in electronegativity, the larger the dipole moment.

Explanation:

Statement 1 is false because heat is the movement of molecules.

Statement 2 is true because matter is composed of elementary particles which are VERY small.

Statement 3 is false because the kinetic energy of a particle determines its heat and it is impossible for a particle to be completely motionless.

Statement 4 is false because neutrons do not have a charge and make up a large portion of all matter.  

Answer:

1. B

2. C

3. A

4. C

5. A

6. B

Explanation:

1. Mary discovered that the cell membrane of a bacteria acts like a fence because it keeps some things in and other things out: this is an analogy because there's a comparison between the cell of a bacteria and a fence.

2. Mary walked into her room where her little son was playing, found a broken window, and thought immediately that her son had broken it: this is an inference because she immediately thought her son broke it.

3. Mary noticed that her counter top was warm to the touch: this is an observation which was based on an evidence of touch.

4. Mary noticed that the side walk was wet and thought that it may have been that the sprinklers had been on recently: this is an inference because it was based on her thoughts.

5. Mary counted and recorded 20 heart beats in 10 seconds: this is an observation because she actually counted her heart beats.

6. The lecturer compared the human eye to a camera lens: this is an analogy because it was a comparison between a human eye and a camera lens.

12 Km / hour

Explanation:

using the formula

average speed =  ( where time is in hours )

40 min =  =  hour

speed = 8 ÷  = 8 ×  = 12 Km / hour

Answer:

12 Km / hour