The fastest train in the world can travel 1,500 kilometers in 3 hours. What is its speed?

Answer:

Copper is a good conductor but carbon isn't

Copper has 1 valence electrons but carbon has 4 valence electrons

Explanation:

The  two differences between copper and carbon is that of electronic configuration due to which copper is a metal and carbon is a non-metal.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

Learn more about electronic configuration,here:

https://brainly.com/question/29757010

#SPJ6

Answer:

E, answer 5, A positively charged atom has more protons than electrons.

Explanation:

Answer:

A base is weak when only a little of it is dissolved in water

Explanation:

Answer: B.) A base is weak when only a little of it is dissolved in water

Hope this helps :)

Answer:

A

Explanation:

If its going at a constant speed it will not accelarate wich means to speed up.

Carbon dioxide is released when limestone is heated during the production of [tex]\sf\purple{cement}[/tex]. ✔

[tex]\circ \: \: { \underline{ \boxed{ \sf{ \color{green}{Happy\:learning.}}}}}∘[/tex]

Answer:

Explanation: the tip of a growing plant contains special rapidly diving cells called apical meristem ,these cells are responsible for increase in the length of the plant . if we cut out these cells ,length growth of the plant will be stunned as these cells are not present anyplace else.

Answer:

Ca^2+

Explanation:

As we know, more energy is required to remove an electron from a positively charged ion than is required to remove an electron from a neutral atom. Hence, the second ionization energy of calcium is greater than its first ionization energy.

However, the third and fourth ionization energies of calcium are much higher than the second ionization energy because they involve removal of electrons from an inner filed shell. This process requires a lot of energy and is often not feasible.

Hence, the most common ion of calcium must be Ca^2+ where only two electrons are removed from calcium.

Answer:

Electrical resistivity is a property of a material that tells you how much it resists the flow of electric current, while conductivity quantifies how easily current flows.

Answer:

C

Explanation:

The nucleus is very dense

Answer:

The pressure is equal to 0.775 atm.

Explanation:

Given that,

The atmospheric pressure on Stevens pass was measure to be 589mmHg.

We need to find the pressure in atm.

We know that,

1 standard atmosphere = 760 mm Hg

1 mm Hg = (1/760) standard atmosphere

589 mm Hg = (1/760)× 589 standard atmosphere

= 0.775 standard atmosphere

Hence, the pressure is equal to 0.775 atm.

Answer:

24.1kJ

Explanation:

Heat capacity of water = 4200

Latent Heat of ice = 333550

Heat of Fusion = m × l = 333550 × (32/1000)kg = 10,672 = 10.672kJ

H = (m × c × change in temperature)

H = (32/1000)kg × 4200 × (85 -- 15)

H = (32/1000) × 4200 × 100

H = 13,440J = 13.44kJ

So amount of heat = 13.44kJ + 10.672kJ = 24.112kJ ~ 24.1kJ

Given-

Mass of CH4 - 45.6 grams

Molar mass of CH4 - 16.04 g/mol

volume - 275mL

Temperature- 55°C

Solution,

moles of methane (CH4) n = 45.6/16.04

= 2.84 moles

Using Formula,

Pv = nRT

P*275 = 2.84*8.314*55

P = 1298.64/275

P = 4.72 Atm.

Answer - The pressure inside the container in atm is 4.72.

45.6 grams of CH4 is placed into a 275 mL container at 55.00 C. The pressure is 4.72 atm.

The pressure that one of the gases in a mixture would exert if it were in the same volume on its own.

Given the mass is 45.6 grams

The volume is 275 L

Temperature is 55.00 C.

Calculate the moles

[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{45.6}{16.04} = 2.84 moles[/tex]

Now, calculating the pressure

PV = nRT

[tex]P\times 275 = 2.84\times 8.314\times 55 = 4.72 atm.[/tex]

Thus, the pressure inside the container in is 4.72 atm.

Learn more about pressure

https://brainly.com/question/12971272

#SPJ2

Answer:

the particles start to spread out and cause it to get warmer

Explanation:

Yes, potassium metal can be used to react with an acid to prepare a soluble salt.

Acids react with metals to yield the corresponding metal salt and hydrogen gas.

One of the properties of metals is their ability to react with dilute acids to yield  a soluble salt and hydrogen gas. This is a common reaction for all metals that are above hydrogen in the activity series.

Potassium can react with a hypothetical acid HB as follows;

2K(s) + 2HB(aq) ------> 2KB(aq) + H2(g)

https://brainly.com/question/6136372

Answer:

I think it has to do with batteries 'n stuff

AH— Ampere Hour

Answer:

Its a rock planet and has an iron core

Explanation:

Answer:

"a rocky planet with a huge iron core"

it takes up nearly 3/4of the planets diameter

It orbits around the sun

Answer:

PV= n RT

4.3×y = 5×277

4.3y =1385

4.3y÷ 4.3y = 1385 ÷ 4.3y

y = 322

Answer:

2.22×10⁻⁹ M

Explanation:

Applying,

[OH⁻][H⁺] = 1×10⁻¹⁴................... Equation 1

Where [OH⁻] = Hydroxyl ion concentration, [H⁺] = Hydrogen ion concentration.

make [OH⁻] the subject of the equation,

[OH⁻] =  1×10⁻¹⁴/[H⁺]............... Equation 2

From the question,

Given: [H⁺] = 4.51×10⁻⁶ M

Substitute into equation 2

[OH⁻] = 1×10⁻¹⁴/4.51×10⁻⁶

[OH⁻] = 2.22×10⁻⁹ M

Answer:

1. 0.0500 moles K, 0.0250 moles Cr and 0.1000 moles O.

2. 9.00 moles ammonium ions are present.

Explanation:

1. In 1mol of K2CrO4 there are 2 moles of K, 1 mole of Cr and 4 moles of O.

The moles in 0.0250 moles K2CrO4 are:

0.0250mol * 2 = 0.0500 moles K

0.0250mol * 1 = 0.0250 moles Cr

0.0250mol * 4 = 0.1000 moles O

2. In 1 mole of (NH4)2CO3 there are 2 moles of ammonium ions, NH₄⁺.

In 4,50 moles are:

4.50 moles * 2 = 9.00 moles ammonium ions are present

Answer:

B. 2.2

Explanation:

Answer:

65°C

Explanation:

Formula for calorimetry is:

Q = C . m . ΔT

Where Q is heat, C is specific heat, m is mass and ΔT is the difference between final T° and initial.

We have all data to replace.

First of all, we convert kJ to J → 4.94 kJ . 1000 J / 1 kJ = 4940 Joules

We made this conversion because the unit of C, is in J

As heat is lost, we have to think in a negative value. Let's replace:

- 4940 J = 4.18 J/ g °C . 35 g . ( Final T° - 98.8°C)

- 4940 J / (4.18 J/ g °C . 35 g) =  Final T° - 98.8°C

Final T° = - 4940 J / (4.18 J/ g °C . 35 g) + 98.8°C

Final T° = 65.03 °C

Notice, that this answer has sense because as T° decreased, heat has been lost.

Answer: water

Explanation: those elements all react to water , so the answer would be water . :)

Answer:

D.

Explanation:

Answer

0°C

Explanation:

substance be formed in it's solid state

Answer:

A

Explanation

Any material that exerts magnetic force is considered a magnet. Like all other forces, a magnetic force is a gravitational force. The area between the poles of a magnet has the strongest effect. Magnets attract wood and materials that contain iron.

MARK AS BRAINLEST!!

Answer:

17.6kg

Explanation:

mass = Volume × Density

mass = 5000cm^3 × 3.52g/cm^3

mass = 17600g = 17.6kg

Answer:

.025 ml 02

Explanation:

I made a pdf and pasted it in and etc