During radioactive decay, the __________ isotope decays into a ____________ isotope that has a different ___________________ number.

Answer:

Answer: The formula of the hydrate will be [tex]CuSO_4.7H_2O[/tex] and the name of the compound is copper sulphate heptahydrate.

Explanation:

Water of crystallisation is the number of water molecules that combine chemically in definite molecular proportion with the concerned salt in the crystalline state.

The formula of the hydrate will be [tex]CuSO_4.7H_2O[/tex] and the name of the compound is copper (II) sulphate heptahydrate as there are 7 molecules of water.

Answer:

Relative Humidity

Air Temperature

Explanation:

Relative humidity  and air temperature are the factors that creates fog. When the moist and warm air makes contact with the cooler air, water vapor condenses due to low temperature of that region that causes for the formation of fog. So we can say that relative humidity  and air temperature are the main factors for the formation of fog in that region.

Answer:

High Cold High

Explanation:

Answer:

A. 2H₂O₂  → 2H₂O + O₂

Explanation:

If we make a net sum of both reactions, we're left with:

Grouping species:

There is OI⁻ at both sides, so it is eliminated -same goes for the catalyst, I⁻-.

Thus the answer is option A.

Answer:

0.3139 nm

Explanation:

First of all, let's Calculate the average density of the Cr −Ta alloy;

Formula to get it is;

ρ_avg = 100/[(C_cr/ρ_cr) + (C_ta/ρ_ta)]

We are given;

C_cr = 26%

C_ta = 74%

ρ_cr = 7.13 g/cm³

ρ_ta = 16.6 g/cm³

Thus;

ρ_avg = 100/[(26/7.13) + (74/16.6)]

ρ_avg = 12.34 g/cm³

Similarly, let's Calculate the average atomic weight;

A_avg = 100/[(C_cr/A_cr) + (C_ta/A_ta)]

We are given;

A_cr = 52 g/mol

A_ta = 180.95 g/mol

Thus;

A_avg = 100/[(24/52) + (74/180.95)]

A_avg = 114.88 g/mol

Formula for the volume of the unit cell is;

V = n(A_avg)/(N_A × ρ_avg)

Where;

n is number of atoms in the cell which in this case = 2

N_A is avogadro's number = 6.022 × 10^(23)

Thus;

V = (2 × 114.88)/(6.022 × 10^(23) × 12.34)

V = 30.92 × 10^(-24) cm³

Length of the unit cell edge length is given by the formula;

a = ∛V

Thus;

a = ∛(30.92 × 10^(-24))

a = 0.00000003139 cm

Converting to metre, we have;

a = 0.3139 × 10^(-9) m = 0.3139 nm

Answer:

Melting and Boiling Point Determination

The physical properties of a substance can be used to establish its purity. These properties include the melting point and boiling point. Different substances tend to have different melting and boiling points, and any pure substance will have a specific melting and boiling point.

Answer:75.99

Explanation:saw it on quizlet

When the theoretical yield of Baso, is 58.35 g And, there is 44.34 g of BaSO4 are produced so the percent yield is option b 75.99%.

Since

The theoretical yield of Baso, is 58.35 g. And, there is 44.34 g of BaSO4 are produced

So, here the percent yield is

= Actual yield / theoretical yield

=  44.34 / 58.35

= 75.99%

Hence, the option b is correct.

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Answer:

6.25gm

half life is 66hrs 11 days is 24*11 then take that and divide by 66 to find out how many time it will have halved and half 50 by that many times

Explanation:

If you have 50 grams of Molybdenum-99, after 11 days, 2.7 g will remain.

Molybdenum-99 follows first-order decay.

First-order decay means that for a population of atoms (e.g. radioactive), molecules, or anything else, a constant fraction/unit time is converted to something else.

The half-life (th) of Mo-99 is 66 h.

We will find its rate constant (k) using the following expression.

k = ln2 / th = ln2 / 66 h = 0.011 h⁻¹

Next, we will convert 11 days to hours, knowing that 1 day = 24 h.

11 d × 24 h/1 d = 264 h

If we start with 50 g of Mo-99, we can calculate the remaining mass after 264 h using the following expression.

[tex][Mo] = [Mo]_0 \times e ^{-k \times t} }\\\\[Mo] = 50g \times e ^{-0.011 h^{-1} \times 264 h} } = 2.7 g[/tex]

where,

If you have 50 grams of Molybdenum-99, after 11 days, 2.7 g will remain.

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Answer:

An electrolytic cell is a cell that converts electrical energy into chemical energy.

Any device in which electrical energy is converted to chemical energy or vice versa is referred to as an electrolytic cell. A typical cell consists of two metallic or electronic conductors held apart and in contact with an electrolyte, which is usually a dissolved or fused ionic compound.

An electrolytic cell is a type of electrochemical cell that uses an external source of electrical energy to force a chemical reaction that would not occur otherwise. A voltage applied between the cell's two electrodes, an anode and a cathode immersed in an electrolyte solution, serves as the external energy source.

Electrons in the form of an electric current are deliberately pumped through the chemicals in the section to induce an oxidation-reduction reaction. An electrolytic cell is a setup used to electrolytically decompose water into hydrogen and oxygen.

Electrochemical cells that generate an electric current are known as voltaic or galvanic cells, whereas those that generate chemical reactions, such as electrolysis, are known as electrolytic cells.

Thus, Any device in which electrical energy is converted to chemical energy or vice versa is referred to as an electrolytic cell.

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#SPJ5

Answer:

I think its C I'm sorry if I'm wrong good luck guys!

Explanation:

Answer: 6.75 moles

Explanation:

This is a simple stoichiometry proboe. that I would set up like this:

(13.5 moles CuCI2) (1 mol I2 / 2 moles CuCi2)

That means you all you have to do for this problem is divide by 2 and cancel out the unit moles CuCI2, which leaves you with 6.75 moles I2.

Hope this helps :)

Answer:

C10H15N is the chemical equation for methamphetamine

Answer:

4.16 * 10²⁴ particles

Explanation:

1. We convert from grams to moles

4 g NaCl / 58 g of NaCl = 0.0689655172 moles

-> 0.0690 moles

2. Now we will convert from moles to particles by multiplying by avogadro's number..

0.0690 * 6.022 *10²³ = 4.15518 * 10²⁴ particles or 4.16 * 10²⁴ particles

Answer:

91.7%

Explanation:

The percent yield when it could be used as a buffering agent should be considered as the 91.74%.

Since we know that

Number of moles = Mass in gram / Molar mass

And,

Molar mass of H3PO4 = 97.994 g/mol

So,

Number of moles of H3PO4

= 100 g / 97.994 g/mol

= 1.02 mol

Now

Molar mass of K2HPO4 = 174.2 g/mol

So,

Theoretical yield of K2HPO4 = 174.2 g/mol * 1.02 mol

= 177.684 g

So finally

Percent yield = Actual yield * 100 / Theoretical yield

= 163 g * 100 / 177.684 g

= 91.74%

hence, The percent yield when it could be used as a buffering agent should be considered as the 91.74%.

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Answer:

The correct answer is B.2.52 mol

Explanation:

The molarity of a solution (M) expresses the number of moles of solute there is in 1 liter of solution. If we have the molarity (M) and the volume in liters (L), we simply multiply M x V to obtain the moles, as follows:

M = 2.21 = 2.21 moles/L

V = 1.14 L

M x V = 2.21 moles/L x 1.14 L = 2.5194 moles ≅ 2.52 moles

Answer: bar graph, circle graphs, line graphs

Explanation:

Answer:

igneous rocks

Explanation:

One type of rock that forms very quickly would be igneous rocks. These are rocks that form after a volcanic eruption, where the molten magma melts everything into lava which then hardens shortly after. This creates a new rock that is a mixture of many other materials called Igneous rocks. Once hardened they usually remain stable and unchanged for a very long time until the next volcanic eruption. An example if the eruption of Tambora which after finishing has created lots of igneous rocks and has not erupted again since 1815.

A rock form easily through volcanic eruption, and remain stable, or unchanged, for a very long period of time because of strong bonding in constitute minerals.

Rock is a solid substance which is naturally occur in the environment, it is made up from minerals. Mainly three types of rocks are present, which are igneous rock, metamorphic rock and sedimentary rock.

We obtain rocks generally by the volcanic eruption and as it is made up of minerals and different minerals have different crystal structure and bonding in these minerals are very strong which not break easily. That's why rocks remain stable or unchanged for a very long time. Only volcanic eruption will break rocks because only they have that much of energy to break. Examples of hard rocks are granite, syenite, unikite, andesite, etc.

Hence, due to strong bonds rocks will stay stable for long time.

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Answer:

Formation. Main-sequence stars, including the sun, form from clouds of dust and gas drawn together by gravity. ... The core that is left behind will be a white dwarf, a husk of a star in which no hydrogen fusion occurs. Smaller stars, such as red dwarfs, don't make it to the red giant state.

Explanation:

Answer:

1: A b/c the table is showing that each different surface resulted in different time for acceleration.

2: D b/c the if the same force is applied to two different masses, the smaller masses would be impacted more and move faster. The larger an object is, then the greater the force you will need for it to move the same distance as the smaller masses.

36 ) Potassium

37 ) Calcium

38 ) fluorine

39 ) fluorine

40 ) Phosphorus

41 ) Phosphorus

42 ) Sulphur

43 ) Sodium

Answer:

it can tell and show what pathogen is in you as well what type and mutation so then your body can fight back and remember the genetic dna so then you will be immune in some way.

Explanation:

Question;

How does a fever aid an immune response?

Answer:

One type of immune cell jumps into the fray after body temperature rises, according to experiments in mice. A fever fights infection by helping immune cells to crawl along blood-vessel walls to attack invading microbes

Answer:

(A)explaining how Marx believed the goals of communism would fix the problems of capitalism.

Explanation:

In the section, "The Necessary Resources", after listing the four resources needed for an economic system to thrive, the author explained the practice of capitalism in the mid-1800s, where people owned private property and how Karl Marx and Friedrich Engels came up with the notion that capitalism did not allow for the fair distribution of resources.

In the section, "Karl Marx and Communism", further explanation was provided as to how Marx felt that capitalism caused a gap between the rich and the poor, how that system was unfair to poorly paid workers and how communism will soon replace capitalism.

Answer:

S0rRy i d0nT kn0w fRenCh

Answer:

3–ethyl–2,2–dimethylhexane

Explanation:

To name the compound given in the question above, do the following:

1. Determine the parent name by determining the longest continuous carbon chain. In this case, the longest continuous carbon chain is 6. Hence, the parent name is Hexane.

2. Identify the substituent group attached to the compound. In this case, we have one ethly group (–CH₂CH₃) and two methyl groups (–CH₃)

3. Locate the position of the substituents by giving them the lowest possible count. In this case,

The two methyl groups (–CH₃) are located at carbon 2

The ethly group (–CH₂CH₃) is located at carbon 3.

4. Combine the above to obtain the name of the compound.

The name of the compound is:

3–ethyl–2,2–dimethylhexane

Which of the following sources could not be used to obtain the DNA of a person lost in a mass disaster?

food found in the victim's refrigerator could not be used to obtain the DNA of a person lost in a mass disaster.

So, correct answer is 2nd one.

Answer:

Answer:

i think niether

Explanation: