Pls help me with this

A radioactive atom will spontaneously release radiation in the shape of energy rather than particles in order to transition into a more steady state.

Radioactivity, as its name suggests, seems to be the act of generating radiation without any external cause. This is carried out by an unstable atomic nucleus that "wants" to abandon certain power in order to change to a more stable form.

Absolutely, since humans consume radioactive materials from the environment through food, drink, and air, our bodies are inherently radioactive. Our bodies take these substances in and store them in our bones, tissues, and organs. We also breathe them in and consume them.

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Answer:

paki sagot naman pls para my isagot ako sa module ko ty

Answer: The mass of lead deposited on the cathode of the battery is 1.523 g.

Explanation:

Given: Current = 62.0 A

Time = 23.0 sec

Formula used to calculate charge is as follows.

[tex]Q = I \times t[/tex]

where,

Q = charge

I = current

t = time

Substitute the values into above formula as follows.

[tex]Q = I \times t\\= 62.0 A \times 23.0 sec\\= 1426 C[/tex]

It is known that 1 mole of a substance tends to deposit a charge of 96500 C. Therefore, number of moles obtained by 1426 C of charge is as follows.

[tex]Moles = \frac{1426 C}{96500 C/mol}\\= 0.0147 mol[/tex]

The oxidation state of Pb in [tex]PbSO_{4}[/tex] is 2. So, moles deposited by Pb is as follows.

[tex]Moles of Pb = \frac{0.0147}{2}\\= 0.00735 mol[/tex]

It is known that molar mass of lead (Pb) is 207.2 g/mol. Now, mass of lead is calculated as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\ 0.00735 = \frac{mass}{207.2 g/mol}\\mass = 1.523 g[/tex]

Thus, we can conclude that the mass of lead deposited on the cathode of the battery is 1.523 g.

Answer:

D) biodiversity

Explanation:

the answer is D) biodiversity

Answer:

B

Explanation:

Answer:

Inactive metals are inert metals that doesn’t react with most of the chemicals.They are highly resistant to oxidation and corrosion when exposed to moisture.

Explanation:

The next engineering step to be taken is to update your initial design for the heat shield.

The term heat sheild refers to a device that can be used to shield an from astronaut  extreme heat especially as they re-enter the earth's atmosphere.

After you have identified the problem, the next engineering step to be taken is to update your initial design for the heat shield.

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Answer:

The mass of solution will be "395.78 g".

Explanation:

Given:

Mass of acetic acid,

= 30 g

Percentage,

= 7.58% w/w

Now,

⇒ % [tex]=\frac{Mass \ of \ acetic \ acid}{Mass \ of \ solution}\times 100[/tex]

By putting the values, we get

⇒ [tex]7.58=\frac{30}{Mass \ of \ solution}\times 100[/tex]

⇒ [tex]Mass \ of \ solution=\frac{30\times 100}{7.58}[/tex]

⇒                               [tex]=\frac{3000}{7.58}[/tex]

⇒                               [tex]=395.78 \ g[/tex]

Answer:

[tex]Y=92.25\%[/tex]

Explanation:

Hello there!

In this case, according to the given chemical reaction, it is possible for us to calculate the percent yield by dividing the actual yield of 143 grams of gaseous chlorine by the theoretical yield of 155 g of this gas. In such a way, we proceed as follows:

[tex]Y=\frac{143g}{155g} *100\%[/tex]

Which has a result of:

[tex]Y=92.25\%[/tex]

Regards!

Answer:

all + kn03

Explanation:

and the reaction is single replacement

Answer:

I think it should be

salinity and

light

Answer:

I think it's (a) all of the materials will reach the same temperature and heat flow will stop.

Answer:

280,000g

Explanation:

0.7g/mL x 1000mL/1L x 400L = 280,000g

Explanation:

The first step of the Hydrogen fusion process: a nucleus of Deuterium (2H) is formed from two protons with the emission of an antielectron and a neutrino. The basic Hydrogen fusion cycle involves four Hydrogen nuclei (protons) and two electrons and yields a Helium nucleus, two neutrinos and six photons.

Answer:

C just took it

Explanation:

Answer:

1 Cu + AgNO3 → Ag + CuNO3

2 Cu + Ag(NO3)2 → Ag + CuNO3

Explanation:

plzzz mark me brainliest

Answer:

Considering the side chain of each of the amino acids at pH 7.4, is that amino acid classified at neutral, basic, or acidic? You are currently in a sorting module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop. Neutral Basic Acidic

The answer is in the the images. I have placed all the structures in the specific boxes. I hope this helps.

Molarity of acid=2.5M

pH=5.1.

ka=?

Now

We need to write an eqn to show the dissociation of the acid

HA + H2O === H3O+ + A-

Writing The Equilibrium(Or Acid dissociation constant) of this reaction

Ka =[H3O+] {A-]/ {HA].

The concept behind this is

concentration of Products divided by those of reactants. Water is not written because its a pure liquid and does not affect the Equilibrium constant.

Now If you have any Idea on ICE tables..

You'd know that the concentration of acid will decrease by 2.5-x

Whilst the products...will increase by x each

Note: This is when the ratio of their Moles are in 1:1

ka= x.x/2.5-x

Since the Moles of A- and H3O+ are in 1:1... Their concentrations at equilibrium will be the same

so

Ka= x²/2.5-x

Now what is x??

x is the Hydrozonium ion concentration.

we can get it from the pH formula

pH= -log (H3O+)

Making H3O+ subject by applying Logarithm Rules

H3O+ = 10^-ph

x=10^-5.1

=7.94x10^-6.

Now back to Ka

Ka= x²/2.5-x

Ka= (7.94x10^-6)²/2.5-(7.94x10^-6)

Ka= (7.94x10^-6)²/2.4999

Ka= 2.52x10^-11.

Was a Fun One

The ionization constant of this weak acid is [tex]2.52*10^{-11}[/tex]. The values can be substituted in dissociation formula.

What information do we have?
Molarity of acid=2.5M

pH=5.1

To find:

ka=?

[tex]HA + H_2O < === > H_3O^+ + A^-[/tex]

The value of dissociation constant will be:

[tex]Ka =[H_3O^+] [A^-]/ {HA][/tex]

The Moles of A- and H3O+ are in 1:1.Their concentrations at equilibrium will be the same.

[tex]Ka= x.x/2.5-x\\\\Ka= x^2/2.5-x\\\\pH= -log (H_3O^+)\\\\H_3O^+ = 10^{-pH}\\\\x=10^{-5.1}\\\\x=7.94*10^{-6}[/tex]

[tex]Ka= x^2/2.5-x\\\\Ka= (7.94*10^{-6})^2/2.5-(7.94*10^{-6})\\\\Ka= (7.94*10^{-6})^2/2.4999\\\\Ka= 2.52*10^{-11}\\\\[/tex]

Thus, ionization constant of this weak acid is [tex]2.52*10^{-11}[/tex].

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B. metaphor

The answer is metaphor, because it can't possibly be other thing.

Answer:

89.6 L of H₂ will be produced at STP from 2 moles of CaH₂ and excess water if the reaction goes to 100% completion.

Explanation:

The balanced chemical equation of the reaction between calcium hydride, CaH₂ and excess water to produce calcium hydroxide and hydrogen gas is given below:

CaH₂ (s) + 2H₂O (l) ----> Ca(OH)₂ (aq) + 2H₂ (g)

From the equation of the chemical reaction above, 1 mole of calcium hydride reacts with 2 moles of water to produce 2 moles of hydrogen gas.

Then, 2 moles calcium hydride will react with excess water to produce 2 × 2 -moles of hydrogen gas = 4 moles of hydrogen gas.

One mas a gas at STP has a volume of 22.4 L

4 moles of hydrogen gas will have a volume of 4 × 22.4 L = 89.6 L

Therefore, 89.6 L of H₂ will be produced at STP from 2 moles of CaH₂ and excess water if the reaction goes to 100% completion.

Answer:

E. 2 : 3

Explanation:

Aluminium carbonate is a neutral compound made by aluminium ion, Al³⁺ and carbonate ion, CO₃²⁻. As is neutral, the formula must be:

Al₂(CO₃)₃.

2 Al₃⁺ = 6 positives charges

3 CO₃²⁻ = 6 negative charges

Thus, the simplest whole number ratio between Al³⁺ and CO₃²⁻ must be:

2:3

And right answer is:

Answer:

By boiling and further condensing the liquid with the lowest boiling point.

Explanation:

Hello there!

In this case, according to the attached diagram, it turns out possible for us to infer that the mechanism whereby miscible liquids with different boiling points are separated is distillation, because the flask is heated until the boiling point of the liquid with the lowest value, in order to boil it and subsequently condense it, whereas the liquid with the highest boiling point remains in the flask; and therefore, the two liquids are separated.

Regards!

The conjugate base of HCN is CN^-

The conjugate base of HBr is Br^-

The question is incomplete. The complete question is :

In science, we like to develop explanations that we can use to predict the outcome of events and phenomena. Try to develop an explanation that tells how much NaOH needs to be added to a beaker of HCl to cause the color to change. Your explanation can be something like: The color change will occur when [some amount] of NaOH is added because the color change occurs when [some condition]. The goal for your explanation is that it describes the outcome of this example, but can also be used to predict the outcome of other examples of this phenomenon. Here's an example explanation: The color of the solution will change when 40 ml of NaOH is added to a beaker of HCl because the color always changes when 40ml of base is added. Although this explanation works for this example, it probably won't work in examples where the flask contains a different amount of HCl, such as 30ml. Try to make an explanation that accurately predicts the outcome of other versions of this phenomenon.

Solution :

Consider the equation of the reaction between NaOH and [tex]$HCl$[/tex]

  NaOH (aq) + HCl (aq) → NaCl(aq) + [tex]$H_2O (l)$[/tex]

The above equation tells us that [tex]$1 \text{mole}$[/tex] of [tex]$NaOH$[/tex] reacts with [tex]$1 \text{mole}$[/tex] of [tex]$HCl$[/tex].

So at the equivalence point, the moles of NaOH added = moles of [tex]$HCl$[/tex]present.

If the volume of the [tex]$HCl$[/tex] taken = [tex]$V_1$[/tex] mL and the conc. of [tex]$HCl$[/tex] = [tex]$M_1$[/tex]  mole/L

The volume of NaOH added up to the color change = [tex]$V_2 \text{ and conc of NaOH = M}_2$[/tex] mole/L

Moles of [tex]$HCl$[/tex] taken = [tex]$V_1 \ mL \times M_1 \ mol/100 \ mL = V_2M_2 \times 10^{-3}$[/tex]  moles.

The color change will occur when the moles of NaOH added is equal to the moles of [tex]$HCl$[/tex] taken.

Thus when [tex]$V_1 M_1 \times 10^{-3} = V_2M_2 \times 10^{-3}$[/tex]

or   when    [tex]$V_1M_1 = V_2M_2$[/tex]

or [tex]$V_2=\frac{V_1M_1}{M_2}$[/tex]  mL of NaOH added, we observe the color change.

Where [tex]$V_1, M_1$[/tex] are the volume and molarity of the [tex]$HCl$[/tex] taken.

[tex]$M_2$[/tex] is the molarity of NaOH added.

When both the NaOH and [tex]$HCl$[/tex] are of the same concentrations, i.e. if [tex]$M_1=M_2$[/tex], then [tex]$V_2=V_1$[/tex]

Or the 40 mL of [tex]$HCl$[/tex] will need 40 mL of NaOH for a color change and

30 mL of [tex]$HCl$[/tex] would need 30 mL of NaOH for the color change (provided the concentration [tex]$M_1=M_2$[/tex])

Answer:

b) -25 kJ/mol.

Explanation:

Hello there!

In this case, since the general definition of the enthalpy of reaction involves the subtraction of the energy of the products and the energy of the reactants:

[tex]\Delta H=H_{prod}-H_{react}[/tex]

Thus, since the graph shows that the energy of the products is 20 kJ/mol and that of reactants 45 kJ/mol, we will obtain:

[tex]\Delta H=20kJ/mol-45kJ/mol\\\\\Delta H=-25kJ/mol[/tex]

Which means it is exothermic.

Regards!

Answer:

Hello There!!

Explanation:

I believe the answer is 8.

hope this helps,have a great day!!

~Pinky~

Answer:

Explanation:

The molar mass (MM) of Ca₃(PO₄)₂ can be calculated as follows:

Now we can convert 934.32 g of Ca₃(PO₄)₂ into moles:

Answer:

yes

Explanation:

yes