I need help, plz help me with this problem

I Need Help, Plz Help Me With This Problem

Answers

Answer 1

Answer:

It's b

Explanation:

I had the same exact question


Related Questions

Which of the following is an example of applied research?
a. Developing a way to remove dangerous chemicals from water.
b. Looking for life on distance planets
C. Studying how radiation effects humans.
d. Studying how listening to music affects your mood.

Answers

.A.

Explanation:

The example of applied research to developing a way to remove dangerous to chemical resources from chemical water

Give reasons. a. Troposphere is affected maximum by human activities.​

Answers

Answer:

it is where the ozone layer is locate which is affected by human activities

Answer:

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.​

Answers

Explanation:

i dont know 8th and i am not sure baout carbonic acid in 10 th but they are balanced

2HNO3+ Cu O -> Cu (NO3)2 + H₂O​

Answers

Answer:

it is already balanced bro

True or false..
(A) Burning of magnesium ribbon is physical change

Answers

Answer:

False because it is chemical change

False because it is a chemical change

6c.Calculate the maximum volume, in dm3, of chlorine gas at Stp that can be obtained from 23.4 tonnes of molten sodium chloride. 1 tonne= 10^6 Mr of NaCl=58.5 molar volume of chlorine at stp= 24dm3 Give your answer in standard format.

Answers

Answer:

4.48×10⁶ dm³

Explanation:

We'll begin by converting 23.4 tonnes to grams (g). This can be obtained as follow:

1 tonne = 10⁶ g

Therefore,

23.4 tonnes = 23.4 × 10⁶

23.4 tonnes = 2.34×10⁷ g

Thus, 23.4 tonnes is equivalent to 2.34×10⁷ g

Next, we shall determine the number of mole in 2.34×10⁷ g of NaCl. This can be obtained as follow:

Mass NaCl = 2.34×10⁷ g

Molar mass of NaCl = 58.5 g/mol

Mole of NaCl =?

Mole = mass / molar mass

Mole of NaCl = 2.34×10⁷ / 58.5

Mole of NaCl = 4×10⁵ moles

Next, we shall determine the number of mole of chlorine, Cl₂ produced from the reaction. This can be obtained as follow:

2NaCl —> 2Na + Cl₂

From the balanced equation above,

2 moles of NaCl reacted to produce 1 mole of Cl₂.

Therefore, 4×10⁵ moles of NaCl will react to produce = (4×10⁵ × 1)/2 = 2×10⁵ moles of Cl₂.

Thus, 2×10⁵ moles of Cl₂ were obtained from the reaction.

Finally, we shall determine the volume of Cl₂ produced. This can be obtained as follow:

1 mole of Cl₂ at stp = 22.4 dm³

Therefore,

2×10⁵ moles of Cl₂ at stp = 2×10⁵ 22.4

2×10⁵ moles of Cl₂ at stp = 4.48×10⁶ dm³

Thus, the volume of chlorine obtained from the reaction is 4.48×10⁶ dm³

Determinar el volumen de 20 kg de benceno si su densidad es de 0,88g/cm3

Answers

Answer:

volume = mass/ densidad

0.88g/cm3 = 880kg/m3

v=20kg/880kg/m3

v=0.02272727272

o puede ser 0.0227

o tambien puede ser 0.023

How many electrons are in an ion of sulfur (82)?
The Periodic Table
O A. 2
B. 16
O
C. 8
D. 18

Answers

Answer:

B 16

Explanation:

the atomicnumber =protons of the atom =electrons do keep in mind that they are charged negatief

which of the following statements is true about alkali?
A) bases that soluble in water
B) shows a pH value less than 7
C) Ionises in water to form hydroxonium ions
D) Reacts with carbonate salt to release carbon dioxide gas​

Answers

Answer:

it should be letter c

Explanation:

I hope this help

hii pls help me to balance the equation and state the symbols thankss​

Answers

Answer:

H2 + CuO======Cu + H2O

Explanation:

Cu is copper

H is hydrogen

H2O is water

O is oxygen

CuO is copper 11 oxide

Answer:

[tex]{ \bf{H _{2(g)} + CuO _{(s)} → Cu _{(s)} + H _{2} O _{(g)} }}[/tex]

It's balancing, hope it helps

why is the Dna molecule able to open up and close?

Answers

Answer:

The breaking of the hydrogen bonds due to the force relieves the torsional stress stored in a double helix. As a result, the nucleotide strands rotate more freely about the axis of a helix and start unwinding. ... The DNA unzipping and the DNA unwinding result in a structural transformation from dsDNA to ssDNA.

Which of the following is an example of a molecule?
A. A sodium atom forms a metallic bond with another sodium atom.
B. A hydrogen atom forms a covalent bond with a chlorine atom.
C. A sodium atom forms an ionic bond with a chlorine atom.
D. A sodium atom forms a metallic bond with another sodium atom.

Answers

Answer:

The answer is B. A hydrogen atom forms a convalent bond.........

Is it possible to prepare chlorine in lab without application of heat?

Answers

Answer:

i think it will explode

Which of the following elements will most likely not form an ion at all?
Br
Na
O
Ar
Mg

Answers

Answer:

О

because it has the fewest number of electrons

why mixture of stone pebbles And water is concerned considered suspension you are provided with a mixture of sand salt and camphor how would you separate these particles explain in detail​

Answers

Answer:

camphor sublimates salt is soluble in water while sand does not sublime and does not dissolve in water you first heat the mixture in a beaker covered with a watch glass camphor will then accumulate on the watch glass then you dissolve the remaining mixture of sand and salt salt will dissolve forming a salt solution then you filter using a filter paper and a beaker the residue on the filter paper is sand while the filtrate is salt solution you then heat the salt solution so that it can evaporate leaving salt particles thus you will have obtained salt sand and camphor

help pls I really need the answer I will brainlest​

Answers

Answer:

Latitude: the angular distance of a place north or south of the earth's equator, or of a celestial object north or south of the celestial equator, usually expressed in degrees and minutes. (Left to right)

Longitude: the angular distance of a place east or west of the meridian at Greenwich, England, or west of the standard meridian of a celestial object, usually expressed in degrees and minutes. (Up and down)

Aluminum hydroxide containing medicine is used for gastric why


Answers

Answer:

Aluminum Hydroxide, Magnesium Hydroxide are antacids used together to relieve heartburn, acid indigestion, and upset stomach. They may be used to treat these symptoms in patients with peptic ulcer, gastritis, esophagitis, hiatal hernia, or too much acid in the stomach (gastric hyperacidity).

Answer:

wow it's a very nice question

30 POINTS!! Will mark brainliest if correct answer and all work is shown! What mass in grams of tin would be required to completely react with 1.30 L of 0.750 M HBr in the following chemical reaction? Sn(s) + 4 HBr(aq) → SnBr₄ (aq) + 2 H₂ (g)

Answers

Answer:

mSn=0.24375*59=14.38125

Explanation:

nHBr=1.3*0.75=0.975

nSn=1/4nHBR=0.975/4=0.24375

mSn=0.24375*59=14.38125


Mass of A = 320 g
Volume of A= 64 cm3
A
Density of B = 3 g/cm3
Volume of B = 27 cm3
(Not drawn to scale)
11
22. What is the density of cube A?
A) 0.2 g/cm3 B) 5.0 g/cm3
C) 12.8 g/cm D) 64.0 g/cm3

Answers

Answer:

Mass of A=320g

Volume of A=64cm3

Density of B =3g/cm3

Volume of B = 27 cm3

(Not drawn to scale)

and the density of cube A =5.0g/cm3

Please mark me a brainlist

The density of the object that has been labelled as A from the calculation is  5.0 g/ [tex]cm^3[/tex]. Option B

What is the density?

Density is a physical property of matter that measures how much mass is contained within a given volume.

Density is a fundamental property of matter that describes how mass is distributed within a given volume. It is a useful parameter in various scientific, engineering, and everyday applications.

We know that;

Density = Mass/Volume

= 320 g/64 [tex]cm^3[/tex]

= 5.0 g/ [tex]cm^3[/tex] as seen here

Learn more about density:https://brainly.com/question/29775886

#SPJ3

What is the aim of cleaning of the iron nails before doing the experiment?

Answers

I don’t know I need the points sorry

Three Balanced equations for Ammonium salt+Alkali=Salt+water+carbon dioxide

Answers

Answer:

NH₄Cl (aq) + NaOH (aq) -> NaCl (aq) + H₂O (l) + NH₃ (g)

(NH₄)₂CO₃ (aq) + 2KOH (aq) -> K₂CO₃ (aq) + 2H₂O (l) + 2NH₃(g)

NH₄NO₃ (aq) + LiOH (aq) -> LiNO₃ (aq) + H₂O (l) + NH₃ (g)

Explanation:

The gas liberated when an alkali reacts with an ammonium salt is NH₃ (ammonia), not CO₂.

Oxide of nitrogen that is acidic

Answers

Answer:

Nitrogen oxides are used in the production of nitric acid, lacquers, dyes, and other chemicals. Nitrogen oxides are used in rocket fuels, in the nitrification of organic chemicals, and in the manufacture of explosives.

Explanation:

A bedroom that measures 11 ft by 12 ft by 8.0 ft contains 35.41 kg of air at 25 C. What is the pressure of the air in the room? You may assume that the molar mass of air is 29.0 g/mole.

Answers

Answer:

9.97×10⁻⁴ atm

Explanation:

Applying,

PV = nRT............... Equation 1

Where P = pressure, V = volume, n = number of moles of air, R = molar gas constant, T = Temperature.

make P the subject of the equation

P = nRT/V............ Equation 2

From the question,

Given: V = (11×12×8) ft³ = 1056 ft³ = (1056×28.3168) = 29902.5 L, T = 25°C = (25+273) = 298 K, n = 35.41/29 = 1.22 mole

Constant: R = 0.082 atm.L/K.mol

Substitute these values into equation 2

P = 1.22×0.082×298/29902.5

P = 9.97×10⁻⁴ atm

write down the uses of periodic table। ​

Answers

Answer:

the uses of periodic table is we can classify the elements in different groups.I think.

Answer:

the list is endless so those are some of them but I am sure there are more.

Explanation:

everyone feel free to add

Which of the following oxides is amphoteric oxide?
A)Na2O
B)Al2O3
C)MgO
D)SO2

Answers

Answer:

absolutely B because Al2O3 could react with axit and bazo

Explanation:

Answer:

"Aluminum oxide, beryllium oxide, tin oxide, zinc oxide all are amphoteric. They have reactions as both a base and an acid."

Explanation:

What is the mass of the block of iron that has 10 cm 5 cm and 2 centimeters

Answers

Answer:

787.4g

Explanation:

The dimensions of the iron block is given as follows;

L = 10cm, B = 5cm, H = 2cm

Volume = L × B × H

Volume = 10 × 5 × 2

Volume = 100cm³

Density of iron metal = 7.874 g/cm³

Using the formula;

Density = mass/volume

Mass = density × volume

Mass = 7.874 × 100

Mass of iron = 787.4g

which statement best describes a chemical property of a mineral

Answers

Answer:

The mineral forms gas bubbles when a sample is stored in water

The volume of a 76.52 g sample of methane gas is 32.7 L at 26.9 °C and 4.45 atm. What will its volume be at 95.4 °C and 1.7 atm?​

Answers

Answer:

The volume of a 76.52 g sample of methane gas is

32.7 L at 26.9 °C and 4.45 atm. What will its volume be at 95.4 °C and 1.7 atm?

Explain whether changing the ratio of baking soda and vinegar changes the amount of carbon dioxide produced. Include the evidence you used to reach your conclusion.

Answers

On changing the ratio of baking soda and vinegar changes the amount of carbon dioxide produced is true, because each species will depends on both reactants.

What is chemical reaction?
Chemical reactions are those reactions in which reactants are mixed with each other for the formation of new product.

Chemical reaction between baking soda and vinegar is shown below in the attached image in which the formation of carbon dioxide, water and sodium acetate takes place. So the formation of carbon dioxide depends on the baking soda and baking soda reacts with vinegar to form sodium acetate so change in the ratio will changes the amount of carbon dioxide.

Hence on changing the ratio of reactants and vinegar changes the amount of carbon dioxide.

To know more about chemical reactions, visit the below link:

https://brainly.com/question/26018275

What word chemical equation describes Cavendish’s experiment with zinc?


WILL GIVE BRANLIEST !!!!!!!!!!!!!!!!!!

Answers

Answer:

The reaction between zinc and HCl is given by the symbolic equation

Zn + HCl → ZnCl2 + H2.

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