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3 years ago

What is stronger than steel but cowers from the sun?

2 answers:

5 0

This is a good riddle. The answer is ICE, because ice can break things, even ships like the titanic and it also makes steel weak but when the sun comes it melts away so it’s cowers away.

Ilya [14]3 years ago

5 0

Answer: The answer is Ice.

Explanation: No doubt, Steel is very stronger. Machines and their parts are mainly made up of steel. In metals, the atoms are present in a lattice and they continue vibrating and this protect the metals(alloys) from braking(fracture). When the temperature is very down then atoms stops vibrating in the crystal lattice and the metal can break.

Ice is not a metal but its a solid form of water and it could be stronger than steel because when steel(ships etc are made up of steel) comes in contact of ice the temperature decreases and stops the vibration of metal atoms in the crystal lattice and the steel breaks. So, it shows that Ice is stronger than steel.

We know that melting point for ice is zero degree C. So, when the ice comes in contact to sun light it melts. In this regards, ice cowers from the sun.

Hence, we could say that, Ice is stronger than steel but cowers from the sun.

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Carbon-14 has a half-life of 5,700 years.

Maksim231197 [3]

Answer:

$3.106\ \text{g}$

Explanation:

$t_{1/2}$ = Half-life of carbon = 5700 years

t = Time at which the remaining mass is to be found = 10400 years

$m_0$ = Initial mass of carbon = 11 g

Decay constant is given by

$\lambda=\dfrac{\ln2}{t_{1/2}}$

Amount of mass remaining is given by

$m=m_0e^{-\lambda t}\\\Rightarrow m=m_0e^{-\dfrac{\ln2}{t_{1/2}} t}\\\Rightarrow m=11e^{-\dfrac{\ln 2}{5700}\times 10400}\\\Rightarrow m=3.106\ \text{g}$

The amount of the substance that remains after 10400 years is $3.106\ \text{g}$ .

5 0

3 years ago

Favorable (Exergonic) chemical reactions:

artcher [175]

Answer:

Usually give off heat energy

Explanation:

Exergonic reactions are the ones which are spontaneous. Spontaneous reactions are indicated by the negative change in the Gibbs free energy. In order to provide characteristics for an exergonic reaction, we need to define the Gibbs free energy in terms of the enthalpy change and the entropy change:

$\Delta G=\Delta H-T\Delta S$

Here:

$\Delta H$ is the enthalpy change;

$\Delta S$ is the entropy change;

$T$ is the absolute temperature.

In order to achieve a negative value in the Gibbs free energy change, we should have:

$\Delta H - T\Delta S$

This is true for all temperatures if:

$\Delta H < 0, \Delta S > 0$

The major term here is the change in enthalpy, notice that we wish the enthalpy change to be negative.

Negative enthalpy change corresponds to an exothermic reaction, the one which releases heat. This means exergonic reactions would usually give off heat.

4 0

3 years ago

QUESTION 5

Gnom [1K]

Answer:

They are organic

6 0

3 years ago

Four states or phases of matter

Pie

Answer:

Solid, Liquid, Gas and, Plasma

Explanation:

A solid has a definite shape and volume. A liquid has a definite volume but takes the shape of its container. A gas lacks either a defined shape or volume. Plasma is similar to a gas in that its particles are very far apart, but gas is electrically neutral and plasma has a charge.

5 0

3 years ago

Read 2 more answers

Give the SI base unit of each of these quantities. Enter the abbreviation rather than the name of the unit. mass: __________--le

Vladimir [108]

Answer: mass : kg, length: meter, time: second, temperature: Kelvin

Explanation:

Mass is defined as the amount of matter contained in the body.

Its units are kg, gram, milligram which are inter convertible.

S.I or M.K.S system has seven fundamental units which are used to find derived units

1) Mass - Kilogram

2) Length - meter

3) Time - Seconds

4) Electric Current - Ampere

5) Amount of substance - Moles

6) Intensity of light - Candela

7) Temperature - Kelvin

Thus SI base unit of each of these quantities are kg, meter, second, and Kelvin

4 0

4 years ago