Chemistry High School

Pleaseeee help I’m desperate
If u can answer all three of them
I’ll give you brainliest

Pleaseeee Help Im Desperate If U Can Answer All Three Of Them Ill Give You Brainliest

Answers

Answer 1

Answer:

5.80

Explanation:

Related Questions

Necesito la respuesta

Answers

Answer:

la tercera caja (3rd box)

Explanation:

usa desmos para obtener más ayuda

how did the idea of triads influence the development of the periodic table , even though more than three elements share similar properties ?

A. It established element families
B. It established element groups numbered 1-18
C. It gave rise to the idea of the law of octave
D. It gave rise to the idea of periodicity

Answers

The answer is D. “It gave rise to the idea of periodicity”

Johann Döbereiner identified triads of chemically related elements in 1829 and demonstrated how the properties of the middle element could be anticipated from the properties of the other two. Examples of such triads are lithium, sodium, and potassium.

How did the idea of triads influence the development of the periodic table?

Johann Dobereiner (1780–1849), a German scientist, organized diverse trios of three elements into triads in 1829.Lithium, sodium, and potassium made up one such trio.Triads were based on both chemical and physical characteristics. All known elements could fit on Mendeleev's periodic table, and it also made precise predictions about the presence and characteristics of yet-to-be-discovered elements. Mendeleev organized the elements in his first periodic table according to their masses and other chemical characteristics.Atoms' fundamental chemical structure was unknown at the time.Mendeleev increased the size of his periodic table to include every element at the time. The law of triads was discovered by German scientist Johann Döbereiner, who wrote: "If the elements with similar chemical properties are grouped in the groups of three, the atomic weight of the middle element will be deemed almost equivalent to the arithmetic mean of the two-terminal element's total." The arithmetic mean of the atomic masses of the first and third elements must be about equal to the atomic mass of the second element in order to form a Dobereiner trio.The atomic mass of nitrogen is equal to the arithmetic mean of the atomic masses of carbon and oxygen in this situation, which is 14.They so make up Dobereiner's trio.

       To learn more about periodic table refer

      https://brainly.com/question/14032417

     #SPJ2

can anyone give me just the answers??

Answers

Answer:

11. Redox

12. Acid/Base

13. Precipitation

14. Combustion

15. Precipitation

How much pressure (in atm) would be found in 5.8 moles of an ideal gas at 358 K and volume of 3.9 L?

Answers

Answer:

pressure=force / volume

5.8÷3.9

=1.5 ml

How can the respiratory system become damaged?

Answers

Answer:

Botched surgery, inhaling harmful toxins and smoking.

Explanation:

Smoking is a death wish.

Respiratory failure is a serious condition that develops when the lungs can't get enough oxygen into the blood. Buildup of carbon dioxide can also damage the tissues and organs and further impair oxygenation of blood and, as a result, slow oxygen delivery to the tissues.

3/7 of a sum is Rs.1800. Find the sum​

Answers

Answer:

the sum is Rs 4,200

Explanation:

Given that

3 by 7 of the sum is $1,800

We need to find out the sum

So,

Here we assume the sum be x

So the following equation should be made

3 ÷ 7 × x = 1800

3x = 1800 × 7

x = (1800 × 7) ÷ 3

= Rs 4,200

Hence, the sum is Rs 4,200

The same would be considered and relevant

explain how the alpha particle scattering experiment led to a change in the model of the atom from the plum pudding model?​

Answers

Answer:

So originally, the plum pudding model by J.J Thomson is electrons (negatively charged) held in place by a proton (positively charged) cloud.

Alpha particles are positively charged made of 2 protons + 2 neutrons.

Rutherford's experiment where they beamed those positively charged alpha particles demonstrated that an atom was not a uniform cloud, instead the alpha particles that were deflected was the positively charged nucleus. The alpha particles would also pass through if it didn't hit the nucleus, or be slightly attracted to the negative charge on the electrons. But the overall idea is that Rutherford's experiment changed what the structure of the atom was by discovering that they have a positively charged nucleus due to the deflection of positively charged alpha particles.

PLEASE HELP!!!! What is the molarity of a solution that contains 42.9g of calcium chloride in a 45.0L solution?

Answers

Molarity=moles/liters. Take 42.9 g CaCl2 and divide it by the molar mass of CaCl2 which is 110.98. You get .387 moles. Finally divide .387 moles/ 45 L = .0086 M CaCl2

What do the particles of water look like at A and B? A. B. C. D.

Answers

Answer:

Explanation:

Each particle, or corpuscle, of water is a regular icosahedron (20-sided geometrical solid). This is what water particles look like, according to Plato's description in the Timaeus. In the center is the water-particle Plato describes at 55b, with 6 scalene triangles making up each equilateral face of the icosahedron

Which gas variable has to do with the amount of collisions of gas particles has?
(I think it’s temperature but I’m not sure)

Pressure
Temperature
Amount
Volume

Answers

The answer is temperature

What is defined as the energy required to start a chemical reaction?

heat

reactant energy

activation energy

precipitate energy

Answers

answer is activation energy

Answer:

The energy required to start a reaction is Activation energy.

A sample of water vapor condenses to form liquid water. What change in water
allows this to happen?

Answers

Answer:

Condensation is the process of water vapor condensing into liquid water.

Explanation:

"Water condenses on a can of cold soda. Water vapor in the air reaches its dew point as it cools in the air around the can, forming liquid drops of water. Condensation is the process where water vapor becomes liquid. It is the reverse of evaporation, where liquid water becomes a vapor." -National Geographic"

Explain the role of a primary consumer and a secondary consumer in a food web.

Answers

Answer:

Explanation:

Secondary consumers are organisms that eat primary consumers for energy. Primary consumers are always herbivores, or organisms that only eat autotrophic plants.

Carnivores only eat other animals, and omnivores eat both plant and animal matter.

Which body systeyms work together to supply the body's cells wit oxygen?

Answers

Answer:

The heart which is the circulation centre of blood.

For example the respiratory system and the circulatory system work closely together to deliver oxygen to cells and to get rid of the carbon dioxide the cells produce the circulatory system picks up oxygen in the lungs and drops it off in the tissues then performs the reverse service For carbon dioxide

PLEASE HELP
Referring to the energy diagram below which arrow segment represents the activation
energy of this reaction?


O Arrow B
O Arrow D
O Arrow A
O Arrow C

Answers

Answer:

Arrow B

Explanation:

BRO THIS IS THE 3RD TIME IVE PUT THIS UP CAN SOMEONE HELP NO LINKS OR TROLLS

Answers

Answer:

1) AgNO3 (aq) + KCl (aq) -> AgCl (s) + KNO3 (aq)

Ag+ (aq) + NO3- (aq) + K+ (aq) + Cl- (aq) -> AgCl (s) + K+

(aq) + Cl- (aq)

Ag+ (aq) + Cl- (aq) -> AgCl (s)

2) 2NaCl (aq) + K2CO3 (aq) -> Na2CO3 (aq) + 2KCl (aq)

3) Fe(NO3)3 (aq) + 3NaOH (aq) -> Fe(OH)3 (s) + 3NaNO3

(aq)

Fe³+ (aq) + 3NO3- (aq) + 3Na+ (aq) + 3OH- (aq) ->

Fe(OH)3 (s) + 3Na+ (aq) + 3NO3- (aq)

Fe³+ (aq) + 3OH- (aq) -> Fe(OH)3 (s)

4) BaBr2 (aq) + Na2SO4 (aq) -> BaSO4 (s) + 2NaBr (aq)

Ba²+ (aq) + 2Br- (aq) + 2Na+ (aq) + SO4²- (aq) ->

BaSO4 (s) + 2Na+ (aq) + 2Br- (aq)

Ba²+ (aq) + SO4²- (aq) -> BaSO4 (s)

Explanation:

Sorry, I couldn't make the charges superscript. Don't know how.

On #2, no reaction occurs; everything stays aqueous.

. Water is one of our most important resources. Only about 1% of the Earth's water is for human needs. Name four ways you can help conserve water. This is for science btw...

Answers

Answer:please see explanation for answers

Explanation:

Water conservation is an approach geared towards controlling how water is used. Because of the ever growing population, which weighs so much on water available to mankind,Over negligence and abuse of our water resources have been a great point of concern, that is why the need for the knowledge of water conservation is preached.

Now, some of the ways we can conserve water include

1. Putting off taps while lathering the hands with soap

2.use of irrigation system to water crops and plants

3.. while brushing, make sure to turn off the tap or faucet

4. use a shower rather than a bath

How many moles of KCl are produce when 61.5 g of KClO3 are decomposed?

Answers

Answer:

0.502mol

Explanation:

The balanced chemical equation of the reaction described in this question is as follows:

2KClO3 → 2KCl+ 3O2

According to the equation above, 2 moles of KClO3 will produce 2 moles of KCl.

Using mole = mass/molar mass to convert mass of KClO3 to moles

Molar mass of KClO3 = 39 + 35.5 + 16(3)

= 39 + 35.5 + 48

= 122.5g/mol

mole = 61.5 g ÷ 122.5g/mol

mole = 0.502mol

Since 2 moles of KClO3 will decompose to produce 2 moles of KCl.

0.502 mol of KClO3 will decompose to produce 0.502 × 2/2

= 0.502mol of KCl.

The image shows a diagram of a chloroplast, which captures light energy from thesun. In what type of cell would you expect to find these
organelles?

Answers

Answer: a plant cell

Explanation:

WILL DO ANY THING TO GET A HELPWhich type of wind occurs over a small area?

Question 3 options:

polar easterlies


the Coriolis effect


trade winds


sea breezes

Answers

Answer: Sea breezes

Explanation: Took the test

I NEED NOW PLEASE HELP How many grams of KF are need in order to produce 2.0 mol CaF?​

Answers

Answer 81.98 % I hope this helps if not comment back so I can help I

water, soil, temperature, space

Answers

Answer:

wdym??

Explanation:

Answer:

wdym by water, soil, temperature, space?


If 18.6 g of methanol is used to dissolve 2.68 g of Hg(CN)2, what is the molality of the solution?

Answers

Answer:

I searched it up and screenshot it

Explanation:

I searched it up : )

A mass of 68.45 g of nickel (II) sulfate hydrate, NiSO4∙ nH2O, loses 28.40 g upon dehydration. What is the hydration number of this compound? (Find n.)

Answers

Answer:

n=4

Explanation:

n= (154.75×28.40)÷(68.45×18)

n=3.5

n=4(approximately)



Where can most stars
be found in the H-R
diagram?
A. Main sequence
B. Supergiants
C. White Dwarfs
D. Red Giants

Answers

Answer:

main sequence

Explanation:

The main sequence is a band of stars which includes most of them like our sun

Q.Join sentence using connective.

1.Mary was sick last week.She was a doctor.
1.
​

Answers

Answer:

doctor Mary fell sick last week

NO LINKS!!!!!!!!
how many joules are needed to heat 20g of Cu from 10 to 50 degrees C?

Answers

Answer:

q=309.6 J

Explanation:

Here we'll be using the formula of specific heat capacity: Q=mcΔT

Q= heat (joules)

m=mass (g)

c=specific heat capacity

ΔT= change in temperature > Final temp. - initial temp.

Let's plug in what we know and solve for q=heat.

q=(20)(0.387)(50-10)

q=(20)(0.387)(40)

q=309.6 joules

Depending on your teacher and the problem, they might want you to keep the temperature in C. Mine wanted them all in Kelvin, so if we were to convert it to Kelvin it would be:

273 + 40= 313 K

q=(20)(0.387)(313)

q=2422.6 J

Hey I know this looks easy but
Can somebody plz help tell me where to put the organisms in the correct group (only if u know which ones) thanks :3

WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD!

Answers

Answer:

Benthos: crabs, starfish, lobsters, stingrays,, algae

Plankton: diatom, tubeworms

Nekton: whales, sharks, turtles,

Explanation:

Derive Boyle's law.
i'll mark the brainliest for the answer​

Answers

Answer:

According to Boyle's Law, an inverse relationship exists between pressure and volume. ... The relationship for Boyle's Law can be expressed as follows: P1V1 = P2V2, where P1 and V1 are the initial pressure and volume values, and P2 and V2 are the values of the pressure and volume of the gas after change.  

Hope that helps! :)

-Aphrodite

Explanation:

Marcus has a mass of 75 kg here on Earth. What would his mass be if he was standing on
the Moon?
Remember, gravity on Earth is 9.8 m/s2, gravity on the moon is 1.6 m/s2

1. 120 kg
2. 47 kg
3. 75 kg
4. 20 kg

NO LINKS OR FILE PLEASE

Answers

Answer:

120Kg

Explanation:

body is in moon so we have to multiply mass and gravity of moon

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