Chemistry High School

Please help I'm not sure what the answers are​

Please Help I'm Not Sure What The Answers Are

Answers

Answer 1

Answer:

An element's mass number (A) is the sum of the number of protons and the number of neutrons. The small contribution of mass from electrons is disregarded in calculating the mass number.

Related Questions

Hello Friends Can Yall Plz Help Me For Brainliest Don’t Comments No B.S Yu Will Get Cursed out show ya work

Answers

Answer:

it is b

Explanation:

mid ocean ridge diverges meaning it moving in two different direction horizontally - left to right

____ O3 --> ____ O + ____ O2

Answers

Answer:

1O3 --> 1O + 1O2

Explanation:

Put 1 in every blank

how many moles is 62 G of oxygen gas​

Answers

Answer:

There are 2 moles of oxygen molecules; there are 4 moles of oxygen atoms.

Explanation:

3Al + 3 NH4ClO4 ---> Al2O3 + AlCl3 + 3 NO + 6H20

How many liters of nitrogen monoxide (NO) are formed by completely reacting 50.0 grams of ammonium perchlorate (NH4C104)?

Answers

Answer:

9.63 L of NO

Explanation:

We'll begin by calculating the number of mole in 50.0 g of NH₄ClO₄. This can be obtained as follow:

Mass of NH₄ClO₄ = 50 g

Molar mass of NH₄ClO₄ = 14 + (4×1) + 35.5 + (16×4)

= 14 + 4 + 35.5 + 64

= 117.5 g/mol

Mole of NH₄ClO₄ =?

Mole = mass /molar mass

Mole of NH₄ClO₄ = 50/117.5

Mole of NH₄ClO₄ = 0.43 mole

Next, we shall determine the number of mole of NO produced by the reaction of 50 g (i.e 0.43 mole) of NH₄ClO₄. This can be obtained as follow:

3Al + 3NH₄ClO₄ –> Al₂O₃ + AlCl₃ + 3NO + 6H₂O

From the balanced equation above,

3 moles of NH₄ClO₄ reacted to produce 3 moles of NO.

Therefore, 0.43 mole of NH₄ClO₄ will also react to produce 0.43 mole of NO.

Finally, we shall determine the volume occupied by 0.43 mole of NO. This can be obtained as follow:

1 mole of NO = 22.4 L

Therefore,

0.43 mole of NO = 0.43 × 22.4

0.43 mole of NO = 9.63 L

Thus, 9.63 L of NO were obtained from the reaction.

Hey Friends Can Yall Help Me Show Ya Work And Don’t Comment No B.S Cause Yu Will Get Cursed Out

Answers

C. Speed is how fast, velocity has direction and acceleration is a change in velocity.

PLEASE HELP FAST! NO LINKS
50 POINTS

Answers

Answer:

a

Explanation:

i am wrong haha

Answer:

are u out of time ?

Explanation:

A voltaic cell with a basic aqueous electrolyte is based on the oxidation of Cd(s) to Cd(OH)2(s) and the reduction of MnO4–(aq) to MnO2(s).

Answers

Answer:

See explanation

Explanation:

Oxidation half equation;

3Cd(s) + 6OH^-(aq) ------> 3Cd(OH)2(s) + 6e

Reduction half equation;

2MnO4^-(aq) + 8H^-(aq) + 6e --------> 2MnO2(s) + 4H2O(l)

Balanced reaction equation;

3Cd(s) + 6OH^-(aq) + 2MnO4^-(aq) + 8H^-(aq)  ------> 3Cd(OH)2(s) + 2MnO2(s)

Number of electrons transferred = 6

cells in animals and plants use the ___ that plants put in the air

Answers

Answer:

oxygen

Explanation:

plants and animals use oxygen

What is the gravitational potential energy of a box that is 2.9 m off the ground and a mass of 12.5 kg? * 20 points

Answers

Answer:

362,5J

Explanation:

formula for calculating Gravitational Potential Energy is mass×gravitational field strength ×height

12.5×10×2.9=362,5J

Which planet could support human life

Answers

Answer:

D

Explanation:

It states that D has oxygen, and is closer to the Sun.

Hope this helped, and please mark as Brianliest <3

Answer:

I am pretty sure it is B

Explanation:

The others would either burn u like a crispy chicken nugget or freeze you like a popsicle

Which types of chemical reactions are
considered opposites of one another?

Answers

Answer:

Hi

Explanation:

Decomposition reactions are really the opposite of combination reactions. In decomposition reactions, a single compound breaks down into two or more simpler substances (elements and/or compounds).

Explanation:

Decomposition chemical reactions

Decomposition reactions are really the opposite of combination reactions. In decomposition reactions, a single compound breaks down into two or more simpler substances (elements and/or compounds).

The decomposition of water into hydrogen and oxygen gases

and the decomposition of hydrogen peroxide t form oxygen gas and water

are examples of decomposition reactions.

From which celestial body is a star born?
A. supernova
B. nebula
C. protostar
D. black dwarf

Answers

Answer: B. nebula

Explanation:

Answer:

B. nebula

Explanation:

Birth takes place inside hydrogen-based dust clouds called nebulae.

-TheUnknownScientist

Which two elements are most likely good conductors of
electricity?
A. C and P
B. Zn and N
C. Si and Ne
D. Ag and Au

Answers

Sn and Ag (tin and silver) are most likely good conductors of heat and electricity and shiny when solid. This answer has been confirmed as correct and helpful.

Au + FeSO4= ?????????



Answers

Answer:

what

Explanation:

Guys please help me ill give brainily points

When an apple is cut open and left out on a table in your kitchen it turns brown over
time when oxygen reacts with the apple. Describe what happens to oxygen atoms in
order to make O2 instead of 0 +2 i

Answers

Answer:

Alright, We all know fruits contains enzyme, so there is a reaction name enzymic browning! Actually what happens when we cut the apple and keep it open the organic enzyme molecules starts reacting with oxygen of surroundings and oxidises it!

Which is a characteristic of a physical change?

a
The chemical bonds in the substance are unchanged.

b
The change cannot be seen.

c
The molecules all move at the same speed.

d
The substance has reacted with another substance.

Answers

The answer for your question is a

What volume of 2.0 M hydrochloric acid solution will be consumed when it reacts with 5 grams of magnesium to form magnesium chloride and hydrogen gas?
2HCl + Mg -> MgCl2 + H2​

Answers

Answer:

Explanation:

Remember, matter can neither be created nor destroyed, so every atom of reactant the leftt side of the equation must be accounted for in the products on the right side of the equation. With  magnesium and hydrochloric acid we have:  Mg  +  2HCl   →  MgCl2  +  H2(g).  Magnesium is divalent, and so requires two chloride ions to form magnesium chloride.  Hydrogen gas is a diatomic molecule, so the reaction requires the product to be H2.  Going across the equation from left to right we have 1 atom of magnesium (accounted for on the right side of the equation), and on the left, 2 moles of hydrochloric acid; the two hydrogens represented on the left of the equation are accounted for on the right of the equation.  Likewise, the two chloride anions on the left of the equation are accounted for in the formation of MgCl2 on the right. When all the atoms are accounted for on both sides of the equation, we say the equation is "balanced".

Certain race cars use methanol (CH 3 OH) as fuel. The combustion of 9.8 moles of methanol produces what mass of water?

Answers

The combustion of 9.8 moles of methanol will produce 352.8 grams of water.

Stoichiometric calculation

First, let us look at the balanced equation of combustion of methanol:

[tex]2CH_3OH(l)+3O_2(g)-- > 2CO_2(g)+4H_2O(l)[/tex]

The ratio of number of moles of methanol burned and that of water produced is 1:2.

Thus, 9.8 moles of methanol will produce 19.6 moles of water.

Mass of 19.6 moles water = 19.6 x 18 = 352.8 grams

More on stoichiometric calculations can be found here: https://brainly.com/question/27287858

#SPJ1

A shell container is useful for

Answers

A shell container is useful for:It is used to carry many things.Also, Containers give developers the ability to create predictable environments that are isolated from other applications. And;Containers can also include software dependencies needed by the application, such as specific versions of programming language runtimes and other software libraries.

____ N2 + ___ H2 --> ____ NH3
Reaction :

Answers

N2 +H2 →2 NH3

"Reactants Products Nitrogen 2 2 Hydrogen 2 6 Since NH3 is multiplied by a coefficient of 2 there are now 2 nitrogens and 6 hydrogens. The 6 hydrogens come from the 2 multiplied by the subscript of 3."

The kidneys help the body preserve water. When an animal has not had enough to drink, the kidneys signal the body to absorb water. The animal produces little urine, so it loses less water. During this process, the kidneys work in conjunction with which body system?

Answers

Answer:

This regulatory mechanism is in conjunction with the endocrine system, particularly in the posterior pituitary gland. This is related in the secretion of vasopressin or antidiuretic hormone (ADH). In the event of dehydration or extreme thirst, the body will conserve as much fluid as possible and the posterior pituitary will secrete more ADH that will signal the kidney to reabsorb more water in the collecting tubules.

how many more grams should be added​

Answers

Answer:

50?

I think but not 100% sure if not lmk

The mass in grams of 2.6 x 10^22 chlorine atoms is
a.4.4
b.0.76
c.1.5
d.11

Answers

I believe the answer is 11

A chemist wants to make a gas-liquid solution. However, the gas will not dissolve readily into the liquid solvent. Which step would MOST likely increase the solubility of the gas in the liquid solvent?
A) Expand the volume of the liquid.
B) Increase the temperature of the gas and liquid.
C) Lower the pressure of the gas above the liquid.
D) Increase the pressure of the gas above the liquid.

Answers

Answer:

B

Explanation:

Can't really explain it sorry buy heating the solvent tends to increase the solubility

The step that would increase the solubility of the gas in the liquid solvent is to increase the temperature of the gas and liquid.

What is solubility?

Solubility is the mixing of any substance into another substance and the fully mixing of the ions of the substance to another substance's ions.

Solubility depends upon temperature, increasing temperature increase the solubility.

In the mixing of gas and liquid, the liquid is solvent and gas is solute, always.

Thus, the correct option is B.

Learn more about solubility

https://brainly.com/question/13620168

I need help I don’t really get what I have to do to get the answer

Answers

Reactants are what you start with. Products are what come into being by or through the reactants. You can figure out what the products are in these sentences (which are really chemical equations written out in words rather than symbols) by looking for terms like “yield(s)/to yield,” “form(s)/to form,” “produce(s)/to produce,” “give(s)/to give,” etc. All of these terms provide the notion that you’re getting or making something. The specific substance(s) that follow these terms would be your product(s); the substance(s) that precede these terms would be your reactant(s).

So, for question 2, we see the term “produces.” There is one substance that precedes that term—potassium chlorate, which would be our sole reactant. And there are two substances that follow that term—potassium chloride and oxygen gas, which would be our two products.

In question 3, we see the term “yields” preceded by ammonium nitrate—our sole reactant—and followed by nitrogen gas, oxygen gas, and water vapor—our three products.

Lastly, in question 4, we see the explicit term “produces.” Moreover, we are told directly that dinitrogen tetrahydride reacts with oxygen gas; it should be pretty clear that these two substances are our two reactants here. The substances that we are told are produced are nitrogen gas and water, which would be our two products.

When copper sulphate is dissolved in water in a beaker, a bright blue liquid or solution is formed. If copper sulphate is added until no more will dissolve, a saturated solution is formed. Some blue crystals will remain at the bottom of the beaker?

Please answers quick

Answers

Answer:

ok i dont get your question fully but i'll answer

When copper sulfate is dissolved in water in a beaker, a bright blue liquid or solution is formed. If copper sulfate is added until no more will dissolve, a saturated solution is formed. And some blue crystals will remain at the bottom of the beaker due to crystallization reaction. It is the process by which a solid form, where the atoms or molecules are highly organized into a structure known as a crystal.

Is riding the bus or riding a bike a quicker way to get to school?

Answers

maybe riding a bike???
Definitely a bus not a bicycle

Which of Graphs 1 correctly represents the relationship between the pressure and volume of a gas?

Answers

Answer:

D

Explanation:

pressure is inversely proportional to gas volume

The density of ethanol is 0.789 g/mL. What is the mass of 150 ml. of this alcohol?

Answers

Answer: 120 g

Explanation:

hello BEANS would you like to play a game knok knok

Answers

Answer:

Maybe later, not right now. Tell you when.

hot cheetos hot cheetossss

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