How much of a 100.0 gram sample of Gold-98 remains after 8.1 days if
its half-life= 2.7 days?

50.0 g

12.5 g

6.25 g

25.0 g

Answer:

[tex]d=0.417\ g/cm^3[/tex]

Explanation:

Given that,

Mass, m = 10 g

Volume, V = 24 cm³

We need to find the density of the substance. We know that, the density of a substance is given by :

Density = mass/volume

So,

[tex]d=\dfrac{10\ g}{24\ cm^2}\\\\d=0.417\ g/cm^3[/tex]

So, the density of the substance is [tex]0.417\ g/cm^3[/tex].

Answer:

(C) through the atmosphere

Explanation:

Answer: As a result an increase in kinetic energy also happens.

Explanation:

Potential energy is the energy occupied by an object or substance due to its position.

Kinetic energy is the energy occupied by an object of substance due to its motion.

If the kinetic and potential energy in a system are equal and then an increase in potential energy will occur.

As a  result, there will also occur an increase in kinetic energy also.

Thus, we can conclude that as a result an increase in kinetic energy also happens.

Answer:

[tex]V=6.2L[/tex]

Explanation:

Hello there!

In this case, according to the given information, it is possible for us to realize that we need to use the ideal gas equation in order to calculate the volume of CO2 but firstly calculating the moles:

[tex]n=\frac{12.5g}{44.01g/mol}=0.284mol[/tex]

Then, we proceed with the ideal gas equation to solve for volume:

[tex]PV=nRT=\\\\V=\frac{nRT}{P}\\\\V=\frac{0.284mol*0.08206\frac{atm*L}{mol*K}*(45+273.15)K}{1.20atm}\\\\V=6.2L[/tex]

Regards!

Answer:

Weak acids don't fully dissociate in the solvent, whereas strong acid do.

Explanation:

Answer:  Strong acids dissociate fully in water to produce the maximum number of H + ions. ... Weak acids, such as ethanoic acid (CH 3COOH), do not fully dissociate

Explanation:

Los ácidos fuertes se disocian completamente en agua para producir el máximo número de iones H +. ... Los ácidos débiles, como el ácido etanoico (CH 3COOH), no se disocian completamente

Answer: A long-term environmental change is... ice age, deforestation, urbanization, Earth's orbit, Sun's intensity, global Warming, radioactive waste/pollution. Extinction of species could happen to anyone of the food webs in a long term change.

Explanation:

Answer:

Nebulae are made of dust and gases—mostly hydrogen and helium. ... Eventually, the clump of dust and gas gets so big that it collapses from its own gravity. The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.

Explanation:

Hope this helps

Answer:

B.

Explanation:

B. low temperature, high dissolved oxygen, and neutral pH

Hope this Helps.

Answer:

those things that looks like cristals

Answer:

m= 0.20 Kg

Explanation:

Given: F = 6 J, a = 3 m

To find: What is  the mass of the apple?

Formula: [tex]m=\frac{2KE}{v^2}[/tex]

Solution: Newtons are derived units, equal to 1 kg-m/s². In other words, a single Newton is equal to the force needed to accelerate one kilogram one meter per second squared.

M = F ÷ a

F = 6 kg ÷ 3 m/s2

F = 2 N

PE = mgh 6 J= (3m) (9.8 m/s2²) (__m) m= 0.20 Kg

As the compound has alkyne as the functional group the correct option is A.

Functional group is defined as a substituent or a group of atoms or an atom due to which chemical reactions are carried out. Each functional group will react in the same way regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.

The reactivity of functional group is increased by making modifications in the functional group .Atoms that  are present in functional groups are linked to each other by means of covalent bonds.They are named along with the organic compounds according to IUPAC nomenclature.

As the compound has alkyne as the functional group the correct option is A.

Learn more about functional group,here:

https://brainly.com/question/33836452

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Answer:

Methane is made up discrete molecules hence it adopts a simple molecular structure with weak vanderwaals forces of attraction while Silicon dioxide adopts a giant covalent structure with strong silicon to oxygen bonds.

Hence Silicon dioxide has a high melting point than methane.

Answer:

Chemical reactions and physical transformations do not create or destroy mass in an isolated system, according to the law of conservation of mass. The mass of the products in a chemical reaction must equal the mass of the reactants, according to the conservation of mass law. The law of conservation of mass can be used to solve for unknown masses, such as how much gas is consumed or produced during a reaction.

Explanation:

P1V1 = P2V2

(100.7 kPa)(0.75 L) = (99.8 kPa)V2

V2 = (100.7 kPa)(0.75 L)/(99.8 kPa)

= 0.757 L

Answer:

Ionic compounds are formed by the transfer of electrons that are positively and negatively charged, whereas, covalent compounds are formed by sharing the electrons. 2. In an ionic compound, bonding involves a metal and nonmetal, whereas, in the covalent compound, bonding is between nonmetals

Answer:

one

Explanation:

Answer:

the types of atoms and bonds that a substance contains

Explanation:

Answer:

the types of atoms and bonds that a substance contains

Explanation:

Answer:

Substance is Aluminium

Explanation:

We are given;

Mass; m = 13.5 grams

Volume; V = 5 cm³

Formula for density is;

density = m/V

Density = 13.5/5

Density = 2.7 g/cm³

From the table attached, we can see that the element with a corresponding density of 2.7 is Aluminium

Answer:

C. 1.77x 1023

Explanation:

Not sure please correct me if im wrong

Answer:

I believe it would be (nucleus)

Explanation:

An element is define as a substance which contains only those atoms which have same number of protons. Basically, an element contains atoms of one type only.

For example, a piece of sodium metal will contain only atoms of sodium.

An element can never be divided further into simpler substances. So, in the given figure box 1 is containing atoms of only blue color is an element.

A compound is a substance formed by the chemical combination of two or more different atoms present in a fixed ratio.    

For example, [tex]MgCl_{2}[/tex] is a compound which contains atoms of Mg and Cl in a 1:2 ratio.

The box containing pink and yellow balls in not a compound because here atoms are not chemically combined to each other but they are just present as individual atoms in same box. Hence, this is not a compound.

Therefore, when one or more elements are in a fixed ratio joined together they form a compound.

Answer: 6 mol

Explanation:

From the equation, we know that for every mole of oxygen consumed, 2 moles of water are produced.

This means that if 3 moles of oxygen are consumed, 3(2) = 6 mol of water are produced.

Answer:

Explanation:

To solve this problem we have to find the moles of iron(II) chloride that react. Using the chemical equation, we can kknow moles FeCl2 = Moles FeCO3. Thus, we can find the moles of FeCO3. Converting these moles to grams using its molar mass -Molar mass FeCO3: 115.854g/mol-

Moles FeCl2 = Moles FeCO3:

1.24L * (2.00mol / L) = 2.48 moles FeCl2

Mass FeCO3:

2.48mol * (115.854g / mol) =

Answer:

its 287

Explanation:

i got it right on edm

Answer:

a,b,c

Explanation:

Answer:

C

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