Is aluminium malleable or rigid?

Answers

Answer 1

Answer: Aluminum is malleabe

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Please help I cant figure this outformula is m(t) = Mo e^-rt
decay rate is r= ln2/h. Radium-221 has a half-life of 30 seconds. How long will it take for 90% of a sample to decay = o-rt

Answers

half life formula is t1/2 = ln2/lambda
Where lambda is the decay constant
Rewriting we get lambda = ln2 / t1/2
Subbing in 30 seconds as half life we get lambda= 0.0231049 approx.
I assume only mass of radium is what you want.
Hence he have the formula
m=mo e^-lambda x t
Where m is mass after time
Mo is initial mass.
For 90% to decay, m/mo x100% = 90%
Hence m/mo = 0.1 this is because 90% has decays so we are left with 10%
Rearranging, m=mo e^-lambda x t
We obtain
(m/mo)=e^-lambda x t
Subbing in above values we get,
0.1=e^-0.0231049 x t
Take ln on both sides to get
ln(0.1) = -0.0231049 x t
Hence,
t = ln(0.1) / (-0.0231049)
t= 99.65787 s
It takes about 100 seconds for 90% to decay

H2+ ½ O2 → H2O + 285kJ is an example of a(n)

LOTS OF POINTS PLZ HELP

Answers

Answer:

Exothermic reaction

Explanation:

Notice that the energy component is located on the right side of the reaction. The right side is always known as the product side. Whenever energy is located there, the reaction is known to give off energy - essentially, we can say that energy is a product, as well. Reactions that give off energy are known as exothermic reactions.

On the other hand, if the energy component was located on the left side, or reactant side, of the equation, it would be known as an endothermic reaction.

Here, it's exothermic.

Hope this helps!

Answer: Heat equation

Potassium hydroxide is classified as an Arrhenius base because KOH contains(1) OH- ions (2) O2- ions (3) K+ ions (4) H+ ions

Answers

Answer : The correct option is, (1) $OH^-$ ions.

Explanation :

According to the Arrhenius concept, an acid is a type of substance which ionizes in water to gives $H^+$ ions (hydronium ions or hydrogen ions) and a base is a type of substance which ionizes in water to gives $OH^-$ ions (hydroxide ions).

As we know that KOH is a base which ionizes in water to gives $OH^-$ ions (hydroxide ions) and $K^+$ ions.

Hence, potassium hydroxide is classified as an Arrhenius base because KOH contains $OH^-$ ions.

The answer is (1)OH- ions. The base has more OH- ions while the acid has more H+ ions. And if you dissolve them into water, the pH of the solution is also different. Base has pH>7 and acid has pH<7 at room temperature.

How many electrons are in Al3+?

Answers

atomic number of aluminium = 13
so the number of electrons=13
aluminium cation, has 3 positive charge which it attains after losing 3 electrons (protons are not lost, there remain in the nucleus of the atom
electrons in Al3+ = 13 - 3 = 10

Which statements about the formation of the solar system are true and in a correct order? A.
A black hole collapsed to form the sun; small planetary objects formed; small planetary objects collided with each other to form larger objects.

B.
Most of the dust and gas contracted into a central mass—the Sun; half the mass of the cloud condensed to form Jupiter; asteroids and comets crashed into the sun to form the smaller planets.

C.
A spinning cloud of dust began to compress to form the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets.

D.
Gravitational force held the newly formed planets around the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets.

Answers

The statement about the formation of the solar system that are true and in a correct order are Gravitational force held the newly formed planets around the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets. The answer is letter D.

A buffer contains the weak acid HA and its conjugate base A-. the weak acid has a p Ka of 4.82 and the buffer has a pH of 4.25. Which statement is true of the relative concentration of the weak acid and its conjugate base in the buffer? a) [HA} > [A-]
b) [Ha} < [A-]
c) [HA]=[A-]

Answers

I think the correct answer is A. A buffer is a substance that resists small change in the acidity of a solution when an acid or base is added to the solution. Usually, a buffer involves a weak acid or a weak alkali and one of its salt.

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