you dont have to write the essay but can someone just explain it to me please
and ill give brainliest ofc :)

Answer:

2

Explanation:

Answer:

B. double replacement

Explanation:

Rate, or give brainliest if you can :)

Answer:

CH4 + 2 O2 → CO2 + 2 H2O

Explanation:

There are one mole of O2 on the left side and on the right side there are three moles of O2. And to fix it you would need to make it two moles of O2 to have four molecules of O2 on the left side. Then you would make two moles of H2O to have a total of four moles of O2 on the right. Therefore, CH4 + 2 O2 → CO2 + 2 H2O is the answer.

Answer:

1,2,1,2

Explanation:

hope this helped!

Answer: the answer is a=10m/s^2 right

Explanation: it just make more since then the other answers .

Answer:

c 10

Explanation:

ape.x verified

Answer:

nope

Explanation:

your not my friend yet but you still can friend me

may your day be blessed and happy

Answer:

a and d

Explanation:

Answer:

684

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 684 g of lead would be required to make 119 grams of water.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

The balanced equation for the given reaction can be written as below

Pb + PbO[tex]_2[/tex] + 2H[tex]_2[/tex]SO[tex]_4[/tex] [tex]\rightarrow[/tex]2PbSO[tex]_4[/tex] + 2H[tex]_2[/tex]O

Mathematically,

The mole ratio between lead and water is 1:2

(119 g H2O) / (18.01532 g H2O/mol) x (1 mol Pb / 2 mol H2O) x (207.21 g Pb/mol) = 684 g Pb

The mass of lead comes out to be  684 g.

Therefore, 684 g of lead would be required to make 119 grams of water.

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Answer:

3.1 moles of ammonia

18.67× 10²³ molecules

Mass = 52.7 g

Explanation:

Given data:

Number of atoms of hydrogen = 5.68×10²⁴ atoms

A) Number of molecules of ammonia = ?

Solution:

First of all we will calculate the number of moles of hydrogen.

1 mole = 6.022× 10²³ atoms

5.68×10²⁴ atoms × 1 mol / 6.022× 10²³ atoms

0.94×10¹ mol

9.4 moles of hydrogen

Moles of ammonia:

3 moles of hydrogen are present in one mole of ammonia.

9.4 moles of hydrogen = 1/3×9.4 =

3.1 moles of ammonia

Number of molecules of ammonia:

1 mole contain 6.022× 10²³ molecules.

3.1 mol × 6.022× 10²³ molecules / 1 mol

18.67× 10²³ molecules

c) Mass of sample = ?

Mass = number of moles × molar mass

Mass = 3.1 moles × 17 g/mol

Mass = 52.7 g

Answer:

14

Explanation:

Answer:

As a 7-inch candle burns down, its height decreases 1/2 inch each hour.  How many hours does it take for the candle to burn completely?

Explanation:

It would be 14 because the candle is 7 inches and it loses 1/2 inch each hour.

Answer:

laughing this question is a joke I think at first .

Explanation:

there are many mistakes : electrons are revolving in shell or orbits around the nucleus.

first shell always has two electron

after first shell , all shells contains eight electrons

electron have negative charge

proton have positive charge

nucleus have no charge

atom is neutral becoz the + charge of proton. and - charge of electron cancel each other's effect and atom is stable and neutral

Cyclops are heterotrophic

Answer:

weather

Explanation:

Answer:

liquid state is an intermediate phase between solid and gas phase

Answer is A. H20

Answer:

H2O

Explanation:

As H2 is a gas, and the question asks for the liquid state, it'd be H2O.

The balanced coefficients in the reaction are now; 2, 3, 1, 3.

A balanced chemical reaction equation is one in which the number of atoms of each element on the right hand side of the reaction equation is equal to the number of atoms of the same element on the left hand side of the reaction equation.

For the reaction show, the balanced reaction equation is; 2Al(NO3)3 + 3Na2S → Al2S3 +3 Na(NO3). The balanced coefficients in the reaction are now; 2, 3, 1, 3.

Learn more about reaction equations: https://brainly.com/question/15939621

Answer:

Acid rain

Explanation:

The independent variable in the hypothesis statement is the acid rain. An independent variable is usually the cause in an experiment.

This variable give rises to the effects observed as the dependent variable.

In the presence of the acid rain, the fish population will increase.

The dependent variable is the fish population or number of fishes.

The independent variable is the acid rain as it is the cause of the effect observed on the fish population.

Answer:

b refraction

Explanation:

i saw on nasa's website lol

Answer:

Explanation:

we dream because when our bodies are taking memories into long term, the memories from that day or the day before collide and make dreams. that is why they resemble things that have happened to us.

Answer:

One widely held theory about the purpose of dreams is that they help you store important memories and things you've learned, get rid of unimportant memories, and sort through complicated thoughts and feelings. Research shows that sleep helps store memories.

The brain is so active when we dream that it is virtually indistinguishable from a brain in the waking state. Even so, the chemistry of it is entirely rewired when we sleep. Many scientists attribute this to the reason dreams are so strange and bizarre.

Explanation:

Answer:25J

Explanation: KE:1/2mv^2=KE=25x1=25J

Answer:

Easy 46 million turkeys

Medium three days

Hard: 1934

Fun: The first President on record issuing a "pardon" to his turkey was Ronald Reagan.

Explanation:

hop tis helped

Answer:

125 cubic meters

Explanation:

Subtract 375-250=125 cubic meters

Answer:C - 3.115 g

Explanation:Correct

Answer:

[tex]8.42\ \text{mL}[/tex]

Explanation:

When the endpoint is reached the millimoles of sodium acetate and HCl will be equal.

[tex]\text{Volume of sodium acetate}=25\ \text{mL}[/tex]

[tex]\text{Molarity of sodium acetate}=0.033M[/tex]

[tex]\text{Molarity of HCl}=0.098M[/tex]

[tex]\text{Millimoles of sodium acetate}=25\times 0.033=0.825\ \text{mmol}[/tex]

Let [tex]V=\text{Volume of HCl}[/tex]

[tex]\text{Millimoles of HCl}=0.098V[/tex]

At end point the millimoles will be equal to that of sodium acetate

[tex]0.825=0.098V\\\Rightarrow V=\dfrac{0.825}{0.098}\\\Rightarrow V=8.42\ \text{mL}[/tex]

The volume of HCl required is [tex]8.42\ \text{mL}[/tex].

The volume of HCl required to required to reach endpoint is 8.42 mL

From the question,

We are to determine the volume of HCl required to reach endpoint

First, we will write a balanced chemical equation for the reaction.

The balanced chemical equation for the reaction is

CH₃COONa + HCl → CH₃COOH + NaCl

This means

1 mole of sodium acetate is required to completely neutralize 1 mole of HCl

Now, we will determine the number of moles of sodium acetate present

Using the formula

Number of moles = Concentration × Volume

Concentration of sodium acetate = 0.033 M

Volume of sodium acetate = 25.00 mL = 0.025 L

∴ Number of moles of sodium acetate present = 0.033 × 0.025

Number of moles of sodium acetate present = 0.000825 mole

Now,

Since, 1 mole of sodium acetate is required to completely neutralize 1 mole of HCl

Then,

0.000825 mole of sodium acetate would be required to completely neutralize 0.000825 mole of HCl

∴ The number of moles of HCl needed is 0.000825 mole

Now, for the volume of 0.098 M HCl required to reach endpoint

Using the formula

[tex]Volume = \frac{Number\ of\ moles}{Concentration}[/tex]

∴ Volume of HCl required to required to reach endpoint = [tex]\frac{0.000825}{0.098}[/tex]

Volume of HCl required to required to reach endpoint = 0.008418367 L

Volume of HCl required to required to reach endpoint = 8.418367 mL

Volume of HCl required to required to reach endpoint ≅ 8.42 mL

Hence, the volume of HCl required to required to reach endpoint is 8.42 mL

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Answer:

Protons

Explanation:

Electrons have a negative charge which are found in shells around the nucleus. The nucleus consists of protons and neutron and the neutron has a neutral charge.

Answer:

its eathe a or c a 50/50 chance

Answer:

Explanation:

its B

(please mark as brainliest if it's correct)

Answer:

If the pH of a solution is less than 7, the solution is called acidic; if the pH is about 7, the solution is neutral; if the pH is greater than 7, the solution is is called basic. In an acidic solution, then, the concentration of hydrogen ions is greater than the concentration of hydroxide ions.

Explanation:

Not sure about the context of the question, but you can check with a ph scale tester.

Answer:

Newton's First Law...

Explanation:

The only force that acts on the car is the sudden deceleration from v to 0 velocity in a brief period of time, due to the collision with another object. However, when viewing the total system, the collision in the situation with two cars releases twice as much energy as the collision with a wall

Explanation:

The halogen family and noble gases are similar in just one particular way, they are groups of non-metals. All members of these two groups are categorized as non-metals.

Here are some of the differences between them;