CHEMISTRY MIDDLE SCHOOL

Which reaction is single replacement?(1) 2H2O2 --> 2H2O + O2

(2) 2H2 + O2 --> 2H2O

(3) H2SO4 + Mg --> H2 + MgSO4

(4) HCl + KOH --> KCl + H2O

Answers

Answer 1
Answer: Among the given choices, the third option is the only one which illustrates single replacement. (3)H2SO4 + Mg --> H2 + MgSO4 A single replacement is also termed as single-displacement reaction, a reaction by which an element in a compound, displaces another element. It can be illustrated this way: X + Y-Z → X-Z + Y
Answer 2
Answer: In a single replacement reaction (or simple displacement) an element reacts with a compound and takes the place of another element in that compound. The reaction that shows a sigle replacement is the third one. Where H2SO4 and Mg turn into H2 + MgSO4. In this case Mg replaces H2

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If I'm doing a project for school about a simple machines and I got a wheel and axle, how does the thing work ?!?!?

Answers

The wheel and axle is a simple machine consisting of a circular object called a wheel and a shaft known as an axle, which is attached to the wheel. All simple machines change the amount of effort needed to work and are the basis for all other machines, according to Mediahex. Two examples of a wheel and axle are a doorknob and a round water facet. In a doorknob, a larger handle turns a much smaller axle to move the door latch. In addition, a faucet has a larger handle that turns a much smaller axle to open a water valve. Another example of a wheel and axle is a car steering wheel, where the driver exerts a force on the outer edge of the wheel to cause the front wheels to turn..

I have a balloon that can hold 100 liters of air. If I blow up this balloon with 3 miles of gas at a pressure of 1 atmosphere, what is the temperature of the balloon

Answers

Answer:

99

Explanation:

Because if u ask me it has to be

Write a word equation for 2ZnS(s)+3O2(g) -> 2ZnS(s) + 2SO3(g)

Answers

2ZnS(s)+3O2(g) -> 2Zns(s) + 2SO3(g)

the above given equation is unbalanced as it contains 4 moles of sulphur in the output but in the input there are only two aoms of sulphur so to balance the equation we will write the equation as given under

balanced equation is

2ZnS(s)+3O2(g) -> 2Zn(s) + 2SO3(g)


In words:

When 2 moles of solid zinc sulfide reacts with 3 moles of oxygen gas gives 2 moles of solid zinc  and 2 moles of sulphur trioxide gas.

You leave a piece of bread outside for a few days. It forms green and blue mold. It smells awful. A chemical change has occurred - true or falseexplain you answer stating facts that support your answer.

Answers

Answer:

False

Explanation:

It is not a chemical change, it is a physical change because the molecules of the bread didn't  change, the form of the bread did

What are five main characteristics of a mineral

Answers

  • Minerals are natural
  • Minerals are inorganic
  • Minerals are solids
  • Menirals have definite chemical composition
  • Minerals have  crystalline structure

Explanation:

  • Minerals are natural

Minerals should be found in nature. Elements made laboratories are not actual minerals like masquerading as rubies or sapphires. All naturally available crystals are not minerals like opal and amber.

  • Minerals are inorganic

Minerals are not under any class of organic compounds. Almost all known minerals come from inorganic processes. Some minerals originate from organic processes like pearls.

  • Minerals are solids

Minerals exist only as solids. Solids have a defined volume and shape, and they cannot be compressed any further. Minerals are rigid.

  • Definite chemical composition

Each mineral has a unique combination of atoms that cannot be found in other minerals. The strength of mineral can be defined by the type of bond a mineral has. Some minerals, like gold and diamond, have only one element in it.

  • Crystalline structure

Minerals form crystals that have repeated arrangements of ions. Minerals have different shapes depending on the size of the ion. Crystals usually take six types of shapes.

When you turn on a lamp electric energy changes to?

Answers

im pretty sure it turns into thermal energy
the answer to this question is thermal energy because when you turn on your lamp it changes from electric energy to thermal energy we all know this because it is easy to see what happens when it changes.
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