Chemistry High School

Help Plzz Will give all points

Answers

Answer 1

Answer:

reqirured mediem

Explanation:

Answer 2

Answer:

reqirure a mediem

Explanation:

Related Questions

Which statement BEST explains whether or not matter is conserved in this chemical reaction? A Matter is being conserved because there is an equal number of atoms of each element in the reactants and products, and the total mass of the reactants is equal to the total mass of the products. B Matter is not being conserved because there are more atoms of oxygen in the reactants than there are in the products, so there is also more mass in the reactants than there is in the products. C Matter is being conserved because carbon, hydrogen, and oxygen are found in the reactants and in the products in different arrangements, and the mass of the reactants is equal to the mass of the products. D Matter is not being conserved because there are 11 units in the reactants, one C8H8 and 10 O2, and 12 units in the products, eight CO2 and four H2O, so there is also more mass in the products that in the reactants.

Answers

Answer:

Explanation:

The matter is being conserved because the equal number of atoms of each element in the reactants and products, and the total mass of the reactants is equal to the total mass of the products. Therefore, option (A) is correct.

What is the law of conservation of matter?

One or more initial substances change into different substances in any chemical change. Both the initial and final substances are made up of atoms as all matter is made up of atoms.

According to the law of conservation of matter, matter can neither be created nor destroyed, we just can convert it from one form to another. So the same number and kind of atoms before and after the chemical change are present.

According to this law, the total mass of the reactants in a chemical reaction must be equal to the total mass of products for a low-energy thermodynamic process.

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The _____ variable is the change you are observing and that changes in response to the _____ variable.

Answers

Answer:

Independent variable, dependent variable

Explanation:

Answer:

Dependent variable, independent variable

Explanation:

The dependent variable DEPENDS on the independent variable.

how many joules are needed to warm 25.5 grams of water from 14.0°C to 22.5°C? the heat capacity of liquid water is 4.184J/g°C

Answers

Answer:

Q = 906.882 J

Explanation:

Given data:

Mass of water = 25.5 g

Initial temperature = 14.0 °C

Final temperature = 22.5 °C

Specific heat capacity of water = 4.184 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 22.5 °C - 14.0 °C

ΔT = 8.5 °C

Q = 25.5 g × 4.184 J/g.°C × 8.5 °C

Q = 906.882 J

Use the Periodic Table to find molar mass of water. Sodium hydroxide (NaOH) and hydrochloric acid (HCl) react to form sodium chloride (NaCl) and water according to the equation: NaOH + HCl → NaCl + H2O What mass of water forms when 2.75 × 10–4 mol NaOH reacts completely? 2.75 × 10–4 mol NaOH = g H2O

Answers

Answer:

0.00496

Explanation:

Answer on EDG 2020

Answer:

the answer is 0.00496

Explanation:

2.75 x 10-4 mol NaOH = 0.00496 g H20

the second part is A.

FOR EDG 2020

The energy required to remove an electron from a neutral atom is known as its:

Answers

Answer:

Ionization energy

Explanation:

Please help me solve this USING DIMENSIONAL ANALYSIS! :

Get yourself a snack. Read the nutrition label. How many calories are in the snack? Now convert this into the international unit of energy, the Kilojoule.

How many kJ are in your snack?

1 dietary Calorie = 1000 calories (the dietary Calorie, with a capital C, is what is listed on your nutrition label. This is different than a lower-case c "calorie.")

1 calorie = 4.184 Joules

Complete this sentence: In my ___________, there are _______kJ of energy.

Answers

Answer:

Explanation:

Given: 1 dietary Calorie = 1000 calories

1 calorie = 4.184 Joules

But,

1 dietary Calorie = 1 Kcalorie

= 1000 x 4.184 Joules

= 4184 Joules

= 4.184 KJoules

1 dietary Calories contains 4.184 KJ of energy.

A bottle of Coca cola contains 42 Kcalories; thus,

1 Kcalorie = 1000 calories

= 4.184 KJoules

Energy = 42 x 1 dietary Calories

= 42 x 4.184 KJoules

= 175.728 KJoules

Energy ≅ 176 KJ

So that;

In my bottle of coca cola, there are 176 KJ of energy.

PERIODIC TABLE LOVERS HELP ME WITH THIS AND ILL PUT U ON BRAINLIEST !

Answers

Answer:

an educated guess of f and i

Explanation:

Hii please answer this really easy x

Answers

Answer:

What do we need to find in that question ?

Answer:

1) no

2)yes

3)no

4)yes

Explanation:

hope that it helped you

Which part of the electromagnetic spectrum has a lower frequency than visible light?

gamma rays

x-rays

infrared

ultraviolet

Answers

Answer:

Infrared Radiation

Explanation:

Infrared Radiation

The range of infrared frequencies extends up to the lower limit of visible light, just below red.

The answer is infrared.

PLEASE HELP WITH THIS ASAP

Answers

radio waves
microwaves
infrared
ultraviolet
X-rays
gamma-rays

Determine the frequency of light with a wavelength of 4.50 x 10-7 m.

Answers

Answer:

f = 0.67×10¹⁵ s⁻¹

Explanation:

Given data:

Frequency of light = ?

Wavelength = 4.50 ×10⁻⁷ m

Solution:

Formula:

Speed of light = wavelength × frequency

Speed of light = 3×10⁸ m/s

Now we will put the values in formula.

3×10⁸ m/s = 4.50 ×10⁻⁷ m × f

f = 3×10⁸ m/s / 4.50 ×10⁻⁷ m

f = 0.67×10¹⁵ s⁻¹

Please answer, please answer please answer please answer
my last 2 chemistry question.

Answers

Answer:

1. filtration and evaporation

2. i) water is added to the sand and salt mixture

ii) then the mixture is filtrated and so the sand and the salt water was seperated

iii) the salt water is heated with the help of burner until the water gets evaporated

iv) after the water gets evaporated, the salt is remained in the container

3. observation:

on adding water to the mixture, the salt is completely dissolved in the waterwhen filtrated the sand is seperated from the salt waternow the salt water when heated with the burner until the evaporation, the water is evaporatedthe salt is precipitated and remained in the container

4. cautions:

while using the burner, we should be cautious with firethe container that is heated should be holded with the help of a cloth to avoid heat

10. Haley the hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.
What is her speed?

Answers

Answer:

Explanation:

Speed=Distance/time, so 20/5 divide time divided by distance. so the answer is 4.

The speed of Haley the hummingbird is 4 m/s.

From the question,

We are to calculate the speed of Haley the hummingbird

Speed is given by the formula

[tex]Speed =\frac{Distance\ traveled}{Time\ taken}[/tex]

From the given information,

The hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.

That is,

The bird can cover a distance of 20 meters in 5 seconds.

Therefore,

Speed of the hummingbird = [tex]\frac{20}{5}[/tex]

Speed of the hummingbird = 4 m/s

Hence, the speed of Haley the hummingbird is 4 m/s.

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calculate the number of moles of nitrogen gas present in 400cm3 sample of it a pressure of 790 mmHg and 27°C.

Answers

Answer:

0.02 mol

Explanation:

Given data:

Number of moles of nitrogen = ?

Volume of sample = 400 cm³

Pressure = 790 mmHg

Temperature = 27°C

Solution:

Volume of sample = 400 cm³ (400/1000=0.4 L)

Pressure = 790 mmHg (790/760 = 1.04 atm)

Temperature = 27°C (27+273=300 K)

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K

T = temperature in kelvin

1.04 atm ×0.4 L = n× 0.0821 atm.L/ mol.K ×300 K

0.416 atm.L = n× 24.63 atm.L/ mol

n = 0.416 atm.L /24.63 atm.L/ mol

n = 0.02 mol

How many unpaired electrons are present in the ground state of the atoms in Group 4A(14)?
unpaired electrons

Answers

Answer:

the correct answer is 2

Explanation:

i just did this assignment :)

There will be 2 unpaired electrons in p orbital of unpaired electrons present in the ground state of the atoms in Group 4A(14).

What are unpaired electrons?

The unpaired electrons are those which do not have any pair due to absence of no more electrons and they are highly unstable elements if the electrons are not paired in the orbitals.

There are 4 types of orbitals s, p, d, and f s-orbital consist of one pair of electrons to fill and the p-orbital have 3 blocks which can be filled with 3 pair that is 6 electrons after filling, and two unpaired electrons left in p-orbital.

Therefore, in the ground state of the atoms in Group 4A(14) 2 unpaired electrons in the p orbital of unpaired electrons are present.

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What happens to the luminosity of stars in the main sequence as temperature decreases

Answers

As the size of a star increases, luminosity increases. If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off. Temperature also affects a star's luminosity.

I'll give 40 pts for this one but pls help me....

What is the new volume when the pressure of 20 milliliters of an ideal gas decreases from 202 kPA to 101 kPA?

Answers

3 of them left and i just need points lol sorrrry

Z forms chloride compounds with the formulae ZCl2 and ZC13.

ZCl2 is a pale green solid and ZC13 is a brown solid.

Based on the given information, which are true about element Z?

I Element Z has high melting point.

II Element Z can form complex ion.

III Element Z has more than one oxidation number.

IV Element Z is a metalloid.

A I, III
B II, IV
C I, II, III
D I, II, III, IV

Answers

Answer:

(B) II, IV.

hope this answer is helpful for u.

Why can't anything cheer me up rn?...

:'(

Answers

not sure.. you should eat poptarts

Answer:

well if u need some one i'm here

Explanation:

...

This diagram shows a ball rolling from left to right along a frictionless surface. In which sections will the ball be subjected to a balanced force?

A. Sections 2 and 5
B. Sections 2 and 3
C. Sections 1 and 4
D. Sections 2, 3, and 5

Answers

In sections 1 and 4 the ball is subjected to a balanced force. Hence, option C is correct.

What is the frictionless surface?

A Frictionless surface refers to that kind of surface where the force acting on any object which makes it difficult for the object to slide is almost zero or negligible, i.e., no resistance between surface or substance allowing the object to slide and move freely without any friction.

In sections 1 and 4 the ball is subjected to a balanced force. Hence, option C is correct.

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Answer:1 and

Explanation:

During an experiment, 456 g of carbon dioxide is produced. What is the mass of carbon dioxide in kg?

Answers

Answer:

0.456

Explanation:

Carbon Dioxide, CO2 0.456

456÷1000=0.456

A change in temperature causes a change in density. \
True False

Answers

yes it does change because the volume changes wi the temperature

Answer:

it will be true

Explanation:

which compound is made from metals and non metals

Answers

It’s -> Ionic compound

What is a solution?

Answers

Answer

there are to answers one is an answer to a problem or a mixture of chemicals

Explanation:

Answer:

a liquid mixture in which the solute is uniformly distributed within the solvent.

Explanation:

this was wrong!! plz answer asap! i cant get this wrong :/

Answers

The same because how can it be larger

How many grams of Phosphorus is required to complete combustion of 40g Oxygen P+O2-mm>P2O5 . Please balance

Answers

Answer:

Mass = 31 g

Explanation:

Given data:

Mass of phosphorus required = ?

Mass of oxygen = 40 g

Solution:

Chemical equation:

4P + 5O₂ → 2P₂O₅

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 40 g/ 32 g/mol

Number of moles = 1.25 mol

Now we will compare the moles of P and oxygen.

O₂ : P

5 : 4

1.25 : 4/5×1.25 = 1

Mass of phosphorus:

Mass = number of moles × molar mass

Mass = 1 mol × 31 g/mol

Mass = 31 g

Which is Chemical Equation is Balanced?
CH, +0,------CO,+2H2O
4A1+30,-----2A1,0,
H2+O2-----2H,0

Answers

none of these appear to be balanced. The , is confusing though, is it supposed to be a subscript of a number?

During witch process dose carbon dioxde gas move from the atmosphere

Answers

Answer: it is density

Explanation:

How many possible values are there for the quantity "c", considering a specific chemical reaction represented by the equation aA+bB--> cC +dD, in this equation the letters A,B,C and D represent chemicals, and the letters a,b,c and d represent confessions in the balanced equation.

Answers

Answer:

There is only one possible value for the quantity "c"

Explanation:

There is only one possible value for the quantity "c". This is because the a,b,c and d represent number of moles in he balanced equation. And since the number of moles of a particular substance (atom or compound) in a balanced equation must be distinct, it (the substance) can only have one value. For example, consider the equation below

2C₂H₂ + 5O₂ ⇒ 4CO₂ + 2H₂O

It can be seen from the above equation that the individual number of moles are distinct and have just one possible value. And if C₂H₂ is A, O₂ is B, CO₂ is C and H₂O is D, then 4 is "c".

Thus, "c" is the number of moles for the substance "C" with just one possible value.

Add 2 teaspoons of baking soda and 2 teaspoons of citric acid to the foam cup. Add the half cup of water to the cup and stir. Is a chemical reaction taking place? How do you know? Please help this is due in 2 hours

Answers

Answer:

Test for carbon dioxide gas.

Explanation:

The reaction between baking soda and citric acid will form sodium ions, citric acid ions, carbon dioxide gas, and water. So all you have to do is add the gas produced (by gas displacement method or something) and test whether the gas is carbon dioxide, with lime water or other methods like hydrogencarbonate indicator. Hope this helped!

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On mixing citric acid and baking soda a chemical reaction takes place which is indicated by the evolution of carbon dioxide gas .

What is a chemical reaction?

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction, there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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