Help me, I’m bad a science.

Answer:

copper oxide has been reuced into copper

Explanation:

The copper has gained electrons to become stable on its own without oxygen

OILRIG- show that reducution is the gain of electrons

Answer:

C6H12O6 the third choice

According to the given information , the molecular formula or the chemical formula of glucose is C₆H₁₂O₆.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer:

2.138 x 10^26 atoms Na

Explanation:

atoms Na = 355 mol Na x (6.022 x 10^23 atoms Na/1 mol Na) = 2137.81 x 10^23 atoms Na = 2.138 x 10^26 atoms Na

Answer:

15.547437000000029

Explanation:

Answer:

32 degrees

Explanation:

Answer:

166,600J

Explanation:

Kinetic energy (K.E), which is the energy due to motion of a body, can be calculated by using the formula;

K.E = 1/2 × m × v²

Where;

K.E = kinetic energy (joules)

m = mass of body (kg)

v = speed or velocity (m/s)

According to this question, the mass of the roller coaster is 833.0 kg while its velocity/speed is 20.0m/s.

K.E = 1/2 × 833 × 20²

K.E = 1/2 × 833 × 400

K.E = 1/2 × 333200

K.E = 166,600

Therefore, the kinetic energy of the roller coaster car is 166,600J.

Answer:

The answer is thermal energy

Explanation:

Answer:

no

Explanation:

Small marble chips reacts faster

Answer:

[;

Explanation:

Mudflows (geosphere) and flooding may occur downstream from volcanoes and may inundate streamside communities (biosphere).

Answer:

a. KCl

Explanation:

a. KCl - made of 2 elements

b. NH4Cl

c. KClO3

d. NH4ClO3

Answer:

Ca(NO3)2 + Na2C2O4 ---> <---- Ca + 2NO3 + 2Na + C2O4

Answer:

Answer: everything except E

Explanation: There was no dramatic change in temperature and i just took the assignment.

According to the law of conservation of matter, matter cannot be created not be destroyed. In this experiment, no matter loss will occur but there will be rapid evolution hydrogen gas and the balloon will expand.

According to conservation of matter, matter can neither be created nor be destroyed but its state and properties can be changed. The total mass of the reactants will be equal to the total mass of the products.

Magnesium is a second group element and is a metal. Metal reacts with  hydrogen halides to form metal halides and hydrogen gas as the reaction written below:

[tex]Mg +2 HCl \rightarrow MgCl_{2} +H_{2}[/tex]

The evolved hydrogen gas in this reaction tries to diffuses out the sealing and thus the balloon cover expands.  And thus the solid magnesium metal disappears to form magnesium chloride.

The evolution of gases is exothermic and therefore,  the temperature outside increases suddenly.  There we can see bubbles of hydrogen  in the reaction system.

Therefore, the changes that occur in the experiments are, rapid evolution of gases, solid metal disappears, sealing cover expands and there occur a rapid change in temperature. Thus options A,C,D,E are correct.

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Answer:

Explanation:

The first law of Thermodynamics is known as Conservation because it explains that energy is always maintained within a closed system and cannot be created or destroyed. Therefore, this is observed when there is no longer change in temperature in a system. Mainly because the energy is not being transferred to and from another system. Without this transfer of energy, the energy itself gets conserved within the system and the temperature no longer fluctuates.

Answer:

5.4

Explanation:

V1=5.0

T1=25+ 273=298

V2= z(unknown)

T2=5+273=278

V1/T1 =V2/T2

V2=V1T2/T1

=5*298/278

=5.4

Answer:

Long story short, isotopes are simply atoms with more neutrons — they were either formed that way, enriched with neutrons sometime during their life, or are originated from nuclear processes that alter atomic nuclei. So, they form like all other atoms.

Explanation:

Answer:

B

Explanation:

Because I said so

Answer:

we need to see the diagram

Explanation:

Answer:

1) increases

2)increases

3) Decreases

4) increases

5) increase

6) decreases

Explanation:

Let us remember that in a solid, the molecules of the substance are trapped in fixed positions hence the entropy of a solid is less than that of liquid as well as less than the entropy of a gas.

Reaction (1) and (2) deal with a change of state from solid to liquid or gas leading to increase in entropy.

In reaction (3) the aqueous reactants convert into a liquid product leading to a decreases in entropy.

Reaction (4) and (5) has to do with change of a solid to a gas as well as an increase in volume leading to an increase in temperature.

For reaction(6), a solid is formed so entropy decreases

Answer:

12.5

1.95x10^-10

1.5

0.5

in that order

Explanation:

Answer:

Answer:

Asan po yung choices?

Answer:

Q1: Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Q2: Mass is how much stuff something is made of. Volume is how much space an object takes up.

Answer:

Both similes and metaphors are a poetic device because authors can be seen using them while writing their poem to give the reader a deeper understanding of the character and the setting. Metaphor is a figure of speech that talks about one this but refers to another. On the other hand, a simile is a figure of speech that compares two things together. Usually using the work "like" or "as".

Hoped it helped! Have a great day!

Answer:

We use radio waves for communicating or a for television and radio. We use Heat waves to heat things. We uses heat waves everyday for heat up food in the microwave and drying clothing when using the dryer or when drying our hair with a hairdryer. Infrared light is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark.

Hopefully, it helps :) Give me brainiest please!

Answer:

the moles of N2O are 33/(14.2 + 16) = 0,75 (mol)

NH4NO3 ----------->  N2O + 2H2O

0.75          <---          0.75  

=> The moles of NH4NO3 are 0,75 mol

=> m = 0,75(14.2 + 4 + 16.3) = 60 (g)

Explanation:

Answer:

60 grams of NH4NO3

Explanation:

Answer:

False

Explanation:

I particles have enough kinetic energy to partly overcome the force of attraction between them, matter exists as a liquid. The particles can slide past one another but not pull apart completely. This explains why liquids can change shape but have a fived volume.