Help me,I’m so confused ..and explain pls

3.og idbj mass of mjemantg 2.oml

Explanation:

H, He ---------

Li, Be, --,C, F, Ne

Na, Mg, --,Si, Cl, Ar

K, Ca, Cu, Ge, Br, Kr

Rb, Sr, Ag, Sn, I, Xe

Cs, Ba, Au, Pb, At, Rn

Please give brainliest, I spent a lot of effort on this.

Answer:

chemical change

I hope it's helps you

Answer:

The gas particles would have higher Kinetic energy.

Explanation:

From the formular of kinetic energy:

[tex]{ \sf{KE = \frac{1}{2}m {v}^{2} }}[/tex]

KE is the kinetic energy possessed by particle.

KE is the kinetic energy possessed by particle.m is the particle mass.

KE is the kinetic energy possessed by particle.m is the particle mass.v is the velocity attained by a particle

[tex]{ \sf{KE = \{ \frac{1}{2} m \}} {v}^{2} }[/tex]

keeping the mass, m constant:

[tex]{ \sf{KE = k {v}^{2} }}[/tex]

Therefore, KE is directly proportional to v² :

[tex]{ \sf{KE \: \alpha \: {v}^{2} }}[/tex]

so, when velocity increases, KE also increases.

Answer:

the pressure increased

Answer:

1.false

2.neutron

3.neutron

Answer:

1. false

2. zero

3. isotopes

hope it helps

from my thinking. you should find a solid..then try finding its volume.

Answer:

0.0074 moles

Explanation:

We'll have to use this forumla: PV = nRT

P = Pressure (0.724)

V = Volume in liters (0.25)

n = moles

R = 0.0821

T = temperature in kelvins (25 + 273 = 298)

Our equation will look like this:

(0.724)(.25) = n(0.0821)(298)

0.181 = 24.4658n

Divide both sides by 24.4658 to isolate n

0.181/24.4658 = 24.4658n/24.4658

n = 0.00739808

Answer:

D

Explanation:

Atomic mass is the total mass of protons, neutrons and electrons of an atom at rest

Answer:

[tex]\boxed {\boxed {\sf 2.8 \ g/mL}}[/tex]

Explanation:

Density is an object's mass per unit volume. The formula for calculating density is:

[tex]\rho= \frac{m}{v}[/tex]

The mass of the object is 5.8 grams and the volume is 2.1 milliliters.

Substitute the variables into the formula.

[tex]\rho = \frac{5.8 \ g}{2.1 \ mL}[/tex]

Divide.

[tex]\rho = 2.761904762 \ g/mL[/tex]

The original values of mass and volume (5.8 and 2.1) have 2 significant figures, so our answer must have the same. For the number we calculated, that is the tenths place. The 6 in the hundredth place tells us to round the 7 in the tenth place up to an 8.

[tex]\rho \approx 2.8 \ g/mL[/tex]

The density of the object is approximately 2.8 grams per milliliter.

Answer:

A=Ao(1/2)^t/h

A=(100)(1/2)^20/30

A=63g

Answer:

pressure

Explanation:

gas convert to liquid at high pressure.

Answer:

than what can i do lol

Extensive properties depend on the amount of matter in a sample, While Intensive properties do not depend on the amount of matter in a substance.

Answer:

Sand is heavier than water and cannot float in water, so it will sink to the bottom.

Answer:

protons

Explanation:

btw you protons and electrons are always the same

prcAnswer:

e c. proton

Explanation:

i pueslist

Sodium can be used to solve the problem of

Sodium polyacrylate is a sodium salt of polyacrylic acid. It is a super absorbent polymer (SAP) that has great adsorption abilities enabled by the presence of sodium. These abilities find great application in many consumer products as it solves a lot of problems.

Metal ions can be removed from water in industries and water bodies using sodium polyacrylate because it has the ability to increase the surface area of porous substances so that there can be more transfer of mass.

Summarily, the problem of metal ions in water which causes pollution can be solved using GUK.

Learn more about sodium polyacrylate here:

https://brainly.com/question/2202916

Answer:

The average speed is = 11.1m/s

Explanation:

Recall that average speed is defined as the total distance traveled with respect to the total number of time, therefore we say that the total distance traveled is 40Km according to your question, remember, the unit of speed is metre per second, so you change 40km by multiplying it with 1000, recall that, 1000m = 1km, so 40km×1000m = 40,000m, also 1h= 60×60, =3600s

Remember the formula for average speed is = Total distance traveled÷ total time taken

Thus; 40000m/3600s

Then we had, 11.1m/s...

You can ask questions

Answer:

Hydrogen finds a variety of application due to its dual nature. Following are some important uses of hydrogen:

Hydrogen is used in the synthesis of ammonia and the manufacture of nitrogenous fertilizers.

Hydrogenation of unsaturated vegetable oils for manufacturing vanaspati fat.

It is used in the manufacture of many organic compounds, for example, methanol.

Hydrogen chloride is a very useful chemical and is prepared from hydrogen.

Hydrogen can reduce many metal oxides to metals by metallurgical processes.

Hydrogen is used as rocket fuel in many space research activities.

Hydrogen fuel is being experimented within the automotive industry with hydrogen fuel cells.

Answer:

hello ~~

look nucleus is mixture of neutrons and protons.. right?

and we know neutrons have no charge and protons are positively charged so overall charge of nucleus is positive

Answer:

Intensive Properties:  Appearance, State, Reactivity, Density

Extensive Properties:  Mass, Volume

Explanation:

Intensive Properties:  Appearance, State, Reactivity, and Density values all stay the same, regardless of the amount of material.

Extensive Properties:  Mass, and Volume depend on the amount of material present

Mass and volume are extensive properties.

Physical state, densities, appearances, and reactivities are intensive properties.

Explanation:

In the table given, we can see:

Mass and volume are extensive properties.

The physical state, densities, appearances, and reactivities are intensive properties.

Learn more about properties of the matter here:

brainly.com/question/13733851?referrer=searchResults

brainly.com/question/4274614?referrer=searchResults

The two substances can never be separated by distillation because distillation depends on difference in boiling point.

Distillation is a separation method that depends on difference in boiling point between two substances.

Usually, the substance having a lower boiling point is collected first as the temperature is gradually raised. The substance having a higher boiling point then follows.

However, since the two substances have the same boiling point, they can not be separated by distillation because they will be converted to vapor simultaneously thereby making separation impossible.

Learn more: https://brainly.com/question/15946045

Answer:

its D

Explanation:

A and C are ruled out because an opnion of scientist doesnt make the a law and B is not always true

Answer:

Physical Change

Explanation:

Its a physical change because it is not changing its molecular structure it is only changing the shape of the shale.

Answer:

3.8775 kJ

Explanation:

The formula is Q=mcdeltat

We know m (mass) is 150, c (specific heat) is 0.235, and delta t (change in temperature) is 135-25=110

Plug that in and solve for Q

150*0.235*110=3877.5 J

The problem is that this is still in joules so we have to convert to kilojoules

3877.5 J * 1 kJ/1000 J = 3.8775 kJ

i believe the answer is B: both wind up at 60°C

but it's also reasonable to assume, given enough time, they wind up at 20°C because the water would heat up to cool the metal then slowly release the heat to the air untill they both reach 20°C

if it were me I'd answer B, apologies if I'm wrong

Answer:

[tex]{ \sf{3Mg_{(s)} + N_{2(g)} →Mg _{3}N_{2(s)}}}[/tex]