Chemistry High School

Hellpppppp pls it’s due in less than 10 min

Answers

Answer 1

can you show the whole question or type it out? i would love to help

Answer 2

Answer:

Theory

Explanation:

the model of an atom, for example isnt a method, its showing a theory in which scientists have discovered and analyze particles, such as atoms. Therefore it is a theory, something that is a known fact

hope this helped:)

Related Questions

if I fertilize my plants they will grow taller is a certain conclusion data-analysis hypothesis or scientific observation

Answers

That would be a hypothesis

Which of the following is NOT one of the 6 basic elements of life?
A. Oxygen
O B. Potassium
C. Carbon
D. Hydrogen

Answers

Answer:

Pottasium is very good for your body, but for humans to live, we necessarily do not really need potassium. Answer should be B.

Density = 2 g/ml
Volume = 20 ml
What is the mass?

Answers

Answer:

The answer is 40 g

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

volume = 20 mL

density = 2 g/mL

The mass is

mass = 20 × 2

We have the final answer as

40 g

Hope this helps you

what is boiling point.

Answers

Answer:

"the temperature at which a liquid boils and turns to vapor." - Google Dictionary

Which statment correctly decribes a law?
can be changed or replaced
is a factual statment
is not based on observations

Answers

B) is a factual statement
Laws are based on observations and experiments and have been tested many, many times to show no error

0.5 gm of mixture of NH4Cl and NaCl was boiled with 25 ml of 0.95 N NaOH in a vessel till all the ammonia is expelled.The residual solution is cooled and then made up to 100 ml.It was found that 10 ml of the diluted residual solution neutralised by 16 ml of 0.1 N (F=1.06)H2SO4. Calculate the % of pure NH4Cl in the mixture.
Ans:72.66%

Answers

Answer:

72.66%

Explanation:

NH₄Cl reacts in presence of NaOH producing ammonia, NH₃, as follows:

NH₄Cl + NaOH → NaCl + NH₃ + H₂O

The residual NaOH reacts with H₂SO₄ as follows:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O.

The equivalent-gram of H₂SO₄ are:

16mL * 0.1N * 1.06 = 1.696mEq.

As the complete residual solution is 100mL but the neutralization was made only with 10mL, the mEq you need to neutralize the residual NaOH is:

1.696mEq * (100mL / 10mL) = 16.96mEq.

The mEq of NaOH you add in the first are:

25mL * 0.95mEq = 23.75mEq

That means the NaOH that reacts = moles of NH₄Cl is:

23.75mEq - 16.96mEq = 6.79mEq = 6.79mmoles NH₄Cl =

6.79x10⁻³ moles NH₄Cl

In grams (Using molar mass NH₄Cl = 53.5g/mol):

6.79x10⁻³ moles NH₄Cl * (53.5g / mol) =

0.3633g of NH₄Cl are in the original mixture.

% is:

0.3633g/ 0.5g * 100 = 72.66%

The percentage of pure NH₄Cl in the mixture = 72.66%

Given data :

0.5 gm of mixture of NH₄Cl and NaCI

25 ml of 0.95 N NaOH

Determine the % of pure NH₄Cl in the mixture

Given that the reaction equation of the mixture is ;

NH₄Cl + NaOH ----> NaCl + NH₃ + H₂O

And the residual solution reaction with H₂SO₄ is

2NaOH + H₂SO₄ ----> Na₂SO₄ + 2H₂O.

∴ H₂SO₄ ( equivalent gram ) = 16mL * 0.1N * 1.06 = 1.696

but the equivalent gram of H₂SO₄ required to neutralize NaOH = 1.696 * ( 100 mL / 10 mL ) = 16.96

NaOH⁻ = 25mL * 0.95 = 23.75mEq ( from the first reaction equation )

next step : Determine the number of moles of NH₄Cl

moles of NH₄Cl = 23.75- 16.96 = 6.79 * 10⁻³

Final step : Calculate the % of pure NH₄CI in the mixture

moles of NH₄Cl = 6.79 * 10⁻³

molar mass of NH₄Cl = 53.5g/mol

∴ mass of NH₄Cl = 6.79 * 10⁻³ * 53.5 = 0.3633g

% of pure NH₄CI in the mixture = ( 0.3633 / 0.5 ) * 100 = 72.66%

Hence we can conclude that The percentage of pure NH₄Cl in the mixture is 72.66%

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.Which term best describes the important pieces of information that scientists gather and record during an experiment?
conclusions
data
research
supplies

Answers

Answer: Data

Explanation:

The answer is data because data is important pieces of evidence that is collected in a table or a graph.

Answer:

B. Data

Explanation:

Cuz is said so duh

2) Which one
more active in between
Li and Na and why ?
IS

Answers

Answer:

sodium(Na) is more active between Li and Na because is larger in size. Outermost electrons are less tightly held in sodium than in lithium. As a result, sodium loses its outermost electron more easily than lithium.

Which ions produce similar colors in the flame tests?

Answers

Answer:

Two ions that produced similar colors in the flame test were Ca+2 and Sr+2. 3.

Explanation:

The colors are produced when an electron jumps to a higher level and then jump back down.

Ba2+ and Cu2+ and Sr2+ and Li+ were the pair with the similar color. Sr and Li displayed red colors, while Ba and Cu had mild greenish yellowish hues.

Why do some ions in the flame test generate colors that are similar?

The precise sizes of the potential energy jumps differ from metal to metal. As a result, the flame color of each metal will differ due to its unique spectral line pattern. The movement of the electrons in the metal ions contained in the compounds results in the hues of the flame.

The energy released by each electron when it returns to its initial condition determines the hue of the light that is produced.

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2. Sulfur dioxide (SO2) gets blasted out of volcanoes and reacts with oxygen (O2) in our
atmosphere to produce sulfur trioxide (SO3). If 128 grams of sulfur dioxide reacts with
oxygen in the atmosphere and 160 grams of sulfur trioxide (SO3) is produced, how many
grams of oxygen originally reacted?
SO2 + O2= SO3

Answers

31.9988 grams but you didn’t hear it from me

how many kilojoules is 1,500,000 calories

Answers

Explanation:

Which statement describes the formation of metamorphic rocks?
Rocks beneath the surface melt.
Rocks above the surface are eroded.
Rocks beneath the surface are forced toward the mantle.
Rock layers near the surface decrease pressure on layers beneath them.

Answers

Explanation:

A mixture is made up of two or more substances or constituents, which combine physically and can be easily separated. In a mixture, each constituent still maintains its identity and property in the combination.

Among the options given, the formula [tex] H_2O + Mg [/tex] represents a mixture of Water and Magnesium. This is a typical example of a substance that consists of 2 different substances that are combined physically.

If 175 undecayed nuclei remained from a sample of 2800 nuclei, how many half-lives has passed? *

Answers

Answer:

209

Explanation:

Answer:

Four half lives

Explanation:

Which statement best explains why water has a higher boiling point than ethane?
Ethane molecules are smaller than water and can move faster.
Water molecules need relatively less heat energy to move.
Water molecules form hydrogen bonds, which cannot be broken by heating water.
Ethane molecules have no hydrogen bonds and need less energy to separate.

Answers

Answer:

Ethane molecules have no hydrogen bonds and need less energy to separate.

Explanation:

Ethane: has no hydrogen bonding, it has low melting, boiling points, and is a gas at room temperature.

Water: has strong hydrogen bonding between H and O, has relatively high melting and boiling points.

Statement that explains the relationship between boiling point of water and ethane and how the boiling point of water is higher than ethane is D:Ethane molecules have no hydrogen bonds and need less energy to separate.

The boiling point of water is usually high compare to that of ethane because of the hydrogen bonds present in water which is a electromagnetic attraction between hydrogen atom electronegative atom of Oxygen.

And which this requires so much energy to break unlike ethane that doesn't contain any hydrogen bond.

Therefore, option D is correct.

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Potassium (K) and calcium fluoride (CaF2) can both be classified as
(Please help)

Answers

Potassium and calcium fluoride are both metals

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus.

Sodium’s electron affinity value is more negative than the electron affinity value of phosphorus.

Phosphorus’ electron affinity value is more negative than the electron affinity value of sodium.

This information cannot be determined using the periodic table.

Answers

Answer:

Phosphorus’ electron affinity value is more negative than the electron affinity value of sodium.

Explanation:

I got it correct

Answer:

Phosphorus’ electron affinity value is more negative than the electron affinity value of sodium

Explanation:

i got it right

A chemical property of oxygen is that it ____
a.) is the most abundant element in earth's crust
b.) combines with hydrogen to form water
c.) boils at -183 Celcius
d.) has a density of 1.43 g/l
WILL GIVE BRAINLEST + THANKS! <3

Answers

Answer:

the answer you are searching for is

It’s B combines.....

If an atom has 29 electrons and a mass of 64, and it is neutral, what is the name of the atom?

Answers

Explanation:

Copper has an atomic number of 29, so it contains 29 protons and 29 electrons. ... The atomic weight of copper is 64; it has 29 protons and 35 neutrons.

Balancing
equations
• Check that the Synthesis reaction is selected and
that all coefficients are set to one. (The
coefficients are the numbers in the boxes.)
Introduction: The equation H, + O, H,O is unbalanced because there are two oxygen atoms
on the reactants side of the equation, and only one on the products side of the equation. To
balance the equation, you cannot change the structure of any of the molecules, but you can
change the number of molecules that are used.
Question: How are chemical equations balanced?
1. Balance: Tum on Show histograms. The equation is balanced when there are equal
numbers of each type of atom represented on each side of the equation.
In the Gizmo, use the up and down arrows to adjust the numbers of hydrogen, oxygen, and
water molecules until the equation is balanced. When you are done, turn on Show
summary to check your answer.
Write the balanced equation here:
H2+
Н,0
to see other

Answers

2 in front of H2. Technically nothing in front of O2 otherwise put a 1 then a 2 in front of H2O

2H20 + 1O2 —— > 2H2O

Synthesis of reaction can be done by adding two or more reactants to form a product.

The chemical equation are balanced according to the law of conservation of mass. It means that the mass of products on the right side should be equal to the mass of reactants on the left.

When the number of the product and reactants are equal on both the sides than the equation is said to be balanced.

Equation for the water can be balanced as follow:

[tex]2H_{2} + O_{2} = 2H_{2}O[/tex]

The atoms of hydrogen are balanced on both the sides, also the oxygen are balanced.

To learn more about balancing the equation follow the given link:

https://brainly.com/question/7181548

A company employs several high school students in its food-packaging factory. All the students are below 17 years of age. Which act prohibits
the employment of such persons?
OA. Occupational Safety and Health Act
OB. Fair Labor Standards Act
OC. Perishable Agricultural Commodities Act
OD. Homeland Security Presidential Directives

Answers

Answer:

Fair Labor Standards Act

Explanation:

It is correct. I just took the test on Clever

Answer:

I would say it’s B

Explanation:

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