CHEMISTRY MIDDLE SCHOOL

Which of these is indication that a chemical reaction has occurred?A. Freezing of a substance

B. Melting of a substance

C. Boiling of a substance

D. Formation of a Preciptate

Answers

Answer 1
Answer: B.melting of a substance
Answer 2
Answer: I think it's B, the melting of a substance.

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what is the chemical formula for concentrated plutonium exploding and igniting hydrogen and how could it be stabilized? i'm not doing this IRL, so don't worry!

Answers

Basically, an atomic bomb relying on pure fission like a plutonium bomb works by chain reactions. However, something must initiate the chain of reactions : that's where Hydrogen comes in:

the fission reaction of Uranium is U+n\rightarrow Sr+Xe+2n where n is a neutron. Hydrogen is basically a neutron and an electron; it's thus quite easy to start the reaction with hydrogen.

There is no known way to significantly reduce radioactive decay as far as I know (I might be wrong), or to turn radioactive plutonium into non-radioactive plutonium without tearing the molecules apart.

The job of the human heart is to circulate blood through all of the body's arteries, capillaries, and veins. The job of the human lungs is to supply the small amount of blood in them with oxygen. The interaction of these two parts of the human body results in a system that A. removes old blood from the body. B. circulates oxygen-filled blood throughout the body. C. turns the protein in blood into food energy for the digestive system. D. breaks down food energy, and turns it into heat.

Answers

To solve this we must be knowing each and every concept related to heart and its function. Therefore, the correct option is option B that is circulates oxygen-filled blood throughout the body.

What is heart?

The heart is an organ that acts as a blood pump. In spiders as well as annelid worms, it is a straight tube. In mollusks, it is a little more complex structure including one or more collecting chambers (atria) and a primary pumping chamber (ventricle).

The myocardial, a thick muscular wall, is made up of numerous layers in the heart. The endocardium lines the interior, while the pericardium, a narrow layer of tissue, covers the exterior. The interaction of these two parts of the human body results in a system that circulates oxygen-filled blood throughout the body.

Therefore, the correct option is option B that is circulates oxygen-filled blood throughout the body.

To know more about heart, here:

brainly.com/question/14393747

#SPJ2
B
All cells new oxygen and blood is a way for them to get it 

when gravity causes a huge amounts of rock or soil to be carried down a slope this form of erosion is referred to as a

Answers

Mudflow or landslide

Answer:

erosion

Explanation:

Density is a physical property of matter. Density does not change the identity of the substance; it just shows how close the particles of the substance are to each other.The density of a substance also does NOT Change If you change the amount of the substance. One gram of gold has the same density as 10,000 grams of gold,
What is the density of gold if you have 96.9 grams of gold and it takes up 5mL of space?
17.9 g/mL
103.199174 g/ml
50,000 g/ml
19.32 g/mL

PLS HELP AND IF YOU CAN PLEASE HELP ME ON MORE, thanks!

Answers

Answer:

The density of gold is 19. 38 (g)/(mL)

Explanation:

Density is defined as the property that matter, whether solid, liquid or gas, has to compress in a given space. In other words, density is a quantity that allows you to measure the amount of mass in a given volume of a substance. So, the expression for the calculation of the density is the quotient between the mass of a body and the volume it occupies:

density=(mass)/(volume)

Density, according to the International System of Units, is usually expressed in kilogram per cubic meter (kg/m³) or gram per cubic centimeter (g/cm³). Although it can also be expressed in any other unit of mass by volume.

In this case:

  • mass= 96.9 grams
  • volume= 5 mL

Replacing:

density=(96.9 g)/(5 mL)

density=19. 38 (g)/(mL)

The density of gold is 19. 38 (g)/(mL),   that you could approximate the option 19. 32 (g)/(mL)

What’s the difference between the three scales used to measure seismic waves

Answers

Answer:

1234567890-09876543234567890987654567nbvxzsrtgi76578987i6tyuygfvbv

Explanation:

7641q3w4556854965845670

Explain why atoms move at different speeds depending on whether they are liquids or solids.

Answers

The space between the particles allows them to do so. 

Example, a solid's particles are squished together, so it appears as a solid shape. 
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