please help, i will give brainlist, I'm desperate​

Answer:

The green golf ball because it changed speed the most.

Explanation:

Hope this helps! :) Plz mark brainliest again! <3

Explanation:

I'm pretty sure it's; because of the invention of the microscope, scientists were able to work together to develop the cell theory.

Answer:

the answer is D

Explanation:

because I had a test that had this question and I got it correct

Answer:

2NH3 --> 3H2 + N2

Explanation:

It's hard to explain how I got these coefficients  but I recommend watching Tyler DeWitt on Youttube. He explains tons of chemistry concepts in an easy and clear way. I always watch his videos when I don't understand something.

I would type in "How to balance chemical equation" by Tyler DeWitt

Answer:

B

Explanation:

Oil > Animals > Plants > Chemicals

Answer:

The boiling point is directly proportional to the surface area which is proportional to the molecular weight.

Explanation:

Answer:

Very!

Explanation:

Very phat!

help in what??????????????????

Answer:

I cant really see the individual problems very well but i hope this helps

Explanation:

Decomposition = one thing -> 2 or more things

Synthesis= 2 or more things -> 1 thing

Answer:

33962.5 J

Explanation:

From the question given above, the following data were obtained:

Mass (M) = 125 g

Initial temperature (T₁) = 35 °C

Initial temperature (T₂) = 100 °C

Specific heat capacity (C) = 4.18 J/gºC

Heat (Q) absorbed =?

Next, we shall determine the change in temperature. This can be obtained as follow:

Initial temperature (T₁) = 35 °C

Initial temperature (T₂) = 100 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = 100 – 35

ΔT = 65 °C

Finally, we shall determine the heat absorbed. This can be obtained as follow:

Mass (M) = 125 g

Change in temperature (ΔT) = 65 °C

Specific heat capacity (C) = 4.18 J/gºC

Heat (Q) absorbed =?

Q = MCΔT

Q = 125 × 4.18 × 65

Q = 33962.5 J

Therefore, the heat absorbed is 33962.5 J

Answer:

6× 10⁸

Explanation:

We need to find the multiplication of 2 x 10⁴ by 3 x 10⁴.

2 x 10⁴ × 3 x 10⁴

= (3 × 2) x 10⁴ x 10⁴

= 6 x 10⁴ x 10⁴

= 6 × 10⁴⁺⁴

= 6× 10⁸

Hence, the required answer is 6× 10⁸.

Answer:

N20

Explanation:

Answer:

1 oxygen molecule is present in H₂O

Explanation:

How to find out?

There's a 2 beside H in H₂O showing that there are '2 atoms of hydrogen'

However there's no number to the right of Oxygen, so it is just 1.

Answer:

yaeh

Explanation:

a)Ca(OH)

2

​

+CO

2

​

⟶CaCO

3

​

+H

2

​

O

No. of atoms:Ca−1;O−4;H−2;C−1

b)Zn+AgNO

3

​

⟶ZnNO

3

​

+Ag

No. of atoms:Zn−1;Ag−1;N−1;O−3.

Answer:

-Are two atoms of the same element identical?

no two atoms of the same element are not identical.as its nature will be different

-Can water stay liquid below zero degrees

Celsius?

no it can not be 0°c as its freezing point is 0°c

-Can you light diamond on fire?

yes I think.its refractive index is high.

y

-How bad of an alcoholic do you have to be to have your brain affected?

it causes pressure on mind .

-How can glass be a liquid if it's so hard?

by heating with silica.

-How do I know if something is an acid so I can avoid eating it?

it gives hydrogen ion when dissolves in water.

Answer:

best friends

who used to help

caring

Explanation:

chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.

Chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.

This can be solved by using one of the different gas laws. This is shown below:

PV / T

Given:

P1 = 0.98 atm

V1 = 212 cm^3

T1 = 293 K

P2 = ?

V2 = 196 cm^3

T2 = 308K

Substituting to the relation:

P1V1/T1 = P2V2/T2

(0.98 * 212)/293 = (P2 * 196)/308

P2 = 1.114 atm

For this we use general equation for gases. Our variables represent:

p- pressure

v-volume

t- temperature

P1V1/T1 = P2V2/T2

in this equation we know:

P1,V1 and T1, T2 and V2.

We have one equation and 1 unknown variable.

P2 = T2P1V1/T1V2 = 1.1atm

We know that when two lines cross each other forming four angles, such that, each pair of opposite angles are equal to each other. This pair of angles are known as Vertical opposite angles.

Similarly, ∠KML = ∠JML = 25°.

Therefore, Chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.

Learn more about oxygen on:

https://brainly.com/question/13370320

#SPJ7

Answer:

anjsbzhahxbVAbzbsbsbsbsjsjsdp

Answer:

True

Explanation:

Permanent artificial, temporary artificial and natural. They are classified by the way in which they have achieved magnetism and by how long they remain magnetic.

this is ur answer

plzzz mark me as brainliest

Answer:

Explanation:

Please mark as brainliest the question to much

Answer: it’s the third one

Explanation:

Answer:

It's Opaque because it's a Hard Mattel

Explanation:

(⌐■-■)/━☆ﾟ.*･｡ﾟHave A Good Day

Answer:

The total pressure immediately after the volume reduction is 2.8 atmospheres

Explanation:

The question parameters are as follows;

The initial volume of the reaction vessel, V₁ = 1.00 L

The initial pressure of the reaction system, P₁ = 1.40 atm

The final volume of the reaction system, V₂ = 0.50 L

With the assumption that the gas mixture behaves as an ideal gas, and the temperature is constant, by Boyle's law we have;

P₁·V₁ = P₂·V₂

Where;

P₁ = The initial pressure in the reaction vessel

V₁ = The initial volume in the reaction vessel

P₂ = The total final pressure in the reaction vessel after the reduction in the vessel volume

V₂ = The final volume in the reaction vessel

∴ P₂ = P₁·V₁/V₂

From which we have;

P₂ = 1.40 atm × 1.00 L/(0.50 L) = 2.8 atm

The total final pressure in the reaction vessel, P₂ = 2.8 atm.

Answer:

Explanation:

The exponent is negative because water molecules are absolutely tiny. You can't see a molecule of water on the palm of your hand with your naked eyes, right? If a the mass of a molecule was 1.50 x 10^24, it'd be HUGE... like absolutely massive (possible the size of your city). Molecules are just tiny, tiny particles

Answer:

Li

Explanation:

F is a strongest electronegative element and it will combine with an element with low electronegativity. From the list provided, the element is Li.

Answer:

Overfishing is when people reduce a population by catching too much. The threat goes beyond damage to the ecosystem. It can result in a food crisis and loss of employment for some of around 60 million people who work directly and indirectly in the fishing industry.

Answer:

E) All of these descriptions are true

Answer:

1.2 moles of NH3 are produced

Answer:

B

Explanation:

it transports water from roots to the leafs

Answer: 4.0 moles of sodium will react with water to produce 2.0 mol of hydrogen

Explanation:

The balanced chemical equation is:

[tex]2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq)+H_2(g)[/tex]  

According to stoichiometry :

1 mole of [tex]H_2[/tex] is produced by = 2 moles of [tex]Na[/tex]

Thus 2.0 moles of [tex]H_2[/tex] are produced by =[tex]\frac{2}{1}\times 2.0=4.0moles[/tex]  of [tex]Na[/tex]

Thus 4.0 moles of sodium will react with water to produce 2.0 mol of hydrogen