Write a balanced nuclear equation for the β emission of the following isotopes

92
Sr
38

Answer:

this image represents both a crystalline solid [you can tell because it is clearly a solid, and it has a tightly packed/organized into rows layout}

and a pure element [you can tell this because it is pure--meaning that it is not a mixture (which is why it's not classified as a homogenous mixture instead)]

hope this helps!

Answer:

1 and 4

Explanation:

Pure element because it is made by same type of atom.

Crystalline solid because its structure define it as a solid

Answer:

The Red Circles: Liquid, Blue and Yellow Circles: Solid, and Purple Circles: Gas

Explanation:

Should be it based on the picture and given information.

The rate law uses the molar concentrations of reactants to determine the reaction rate. Hence, option (C) is the correct option

A rate law shows how the rate of a chemical reaction depends on reactant concentration.

For a reaction such as aA → products, the rate law generally has the form

rate = k[A]ⁿ,

where,

Typically, increased concentrations of reactants increases the speed of the reaction, because there are more molecules colliding and reacting with each other.

Hence , The rate law uses the molar concentrations of reactants to determine the reaction rate. Hence, option (C) is the correct option

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Answer: Decide whether they have designed the best possible product.

Answer:

It's a Ionic compound

Explanation:

To tell if CaO (Calcium oxide) is ionic or covalent (also called molecular) we look at the Periodic Table that and see that Ca is a metal and O is a non-metal. When we have a metal and a non-metal the compound is usually considered ionic.

Because we have a metal and non-metal in CaO there will be a difference in electronegativity between the metal and non-metal. This difference results in an electron(s) being transferred from the metal (lower electronegativity) to the non-metal (higher electronegativity). The results in the metal becoming a postitive ion and the non-metal a negative ion. The two opposite charges are attracted and form the ionic bond between atoms in Calcium oxide.

For all three questions, we will use the fact that

1) For 175 mL of solution at 0.203 M, this means that:

Considering the hydrochloric acid solution, if we have 0.035523 mol, then:

2) If there is 20.3 mL = 0.0203 L, then:

This means that the molarity of the diluted solution is:

3) If we need 1.50 L of 0.700 M solution, then:

Considering the 9.36 M acid solution, from which we need 1.05 mol of perchloric acid from,

Answer:

Ba(OH)2(aq) + H2SO4(aq) ----> BaSO4(s) + 2H2O(l)

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side with a plus sign between the entities in both the reactants and the products and an arrow that points towards the products, and shows the direction of the reaction. The coefficients next to the symbols and formulae of entities are the absolute values of the stoichiometric numbers. The first chemical equation was diagrammed by Jeen Beguin in 1615.

A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.

Hope this helps you!

Answer:

Explanation:

Answer:

A magic number is a number of nucleons (either protons or neutrons, individually) that form complete bands within the atomic nucleus. As a result, atomic nuclei with a magic number of protons or neutrons are significantly more persistent than other nuclei.

The Munich Procedural Model is a simple design model that uses the concepts define, optimize, and develop solutions iteratively and in any order. C

The Munich procedural model is a design that illustrates several opportunities regarding the order in which design process and stages beyond mere iteration should take.

A procedural model commonly used for development is the V-model.

Hence, the Munich Procedural Model is a simple design model that uses the concepts define, optimize, and develop solutions iteratively and in any order.

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Answer:

Verdadero!
no se en que mas quieres que te ayude? o cual realmente quieres que sea la respuesta?

Answer:

Solid objects have the least kinetic energy

Explanation:

because solid particles vibrate in place. Gases have the most kinetic energy because their particles move very quickly.

When 1 mole of Zn and 2 mole of O₂ reacts togethor, It will produce 1 mole of ZnO as O₂ is excess reagent and Zn will act as Limiting reagent and thus it limits the amount of product formed.

Limiting reagents are the substances that are completely consumed first in a chemical reaction.

Given ;

Given equation ;

2Zn + O₂ --> 2ZnO

As according to given chemical equation,

2 moles Zn of reacts with 1 mole of O₂ to produce 2 moles of ZnO.

Therefore,

1 mole of Zn will require 0.5 mole of O₂.

But,

the given amount of O₂ is 2 mole which is excess

Hence,

Zn here will act as the Limiting reagent, According to which the amount of product formed will be decided.

Therefore,

If 2 mole Zn produces : 2 moles of ZnO (According to given balanced equation)

Thus,

1 mole of Zn will produce = 2/2 x 1

                                          = 1 mole of ZnO

Hence, When 1 mole of Zn and 2 mole of O₂ reacts togethor, It will produce 1 mole of ZnO as O₂ is excess reagent and Zn will act as Limiting reagent and thus it limits the amount of product formed.

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If a snail crawls at a rate of 228.16cm/s, Its speed in miles per hour will 5.10 miles/hour

The rate at which someone or something moves or operates or is able to move or operate.

Snail covers distance in 1 seconds = 228.16 cm

It covers in 60 seconds (1 min) = 228.16 cm x 60 = 6mtrs

It covers in 60 minutes (1 hour) = 228.16 cm x 60 x 60 = 821376 cm

Now, lets convert cm to miles :

As,                    1 cm = 6.21371 x 10⁻⁶ miles

Thus,     821376 cm = 5.10 miles

hence, If a snail crawls at a rate of 228.16cm/s, Its speed in miles per hour will 5.10 miles/hour

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In conclusion, modeling is very useful for predicting molecular polarity because chemical bonds among different atoms are generated to equal electrical charges.

Molecular polarity refers to the unequal distribution of electrical charges in the atoms of a molecule.

This unequal distribution leads to the generation of molecular poles (positive and negative) at the ends of the chemical bonds.

In conclusion, modeling is very useful for predicting molecular polarity because chemical bonds among different atoms are generated to equal electrical charges.

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The concentration of sodium chloride in the solution is 5.72% (weight/volume percent).

Weight/volume percent concentration (w/v) expresses the amount of solute (in grams) dissolved in a given volume of solution (in milliliters). Specifically, it is defined as the weight of the solute divided by the volume of the solution, multiplied by 100.

To calculate the weight/volume percent concentration, we need to determine the mass of NaCl per volume of the solution.

First, we need to convert the volume of the solution from milliliters (mL) to liters (L):

67.8 mL = 0.0678 L

Next, we calculate the concentration of NaCl in grams per liter (g/L):

Concentration = Mass of solute ÷ Volume of solution

Concentration = 3.88 g ÷ 0.0678 L

Concentration = 57.2 g/L

Finally, we convert the concentration to weight/volume percent by multiplying by 100:

Weight/volume percent = Concentration x 100

Weight/volume percent = 57.2 g/L x 100

Weight/volume percent = 5.72%

Therefore, the concentration of NaCl in the solution is 5.72% (weight/volume percent).

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The problem is not found here but a possible experiment might be to measure the amount of product from a chemical reaction.

An experiment is a procedure used to verify a working hypothesis obtained by applying the scientific method.

Experimental variables that can be tested include, for example, temperature, amount of product from a chemical reaction, etc.

In conclusion, the problem is not found here but a possible experiment might be to measure the amount of product from a chemical reaction.

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Answer:

Inhalation (via the respiratory tract)Absorption (via mucous membranes such as the eyes) Ingestion (via the gastrointestinal tract)

Explanation:

The opening where an infectious disease enters the host's body such as mucus membranes, open wounds, or tubes inserted in body cavities like urinary catheters or feeding tubes.

The empirical formula for the compound is [tex]Fe_3PO_4[/tex] if A 8.63 g sample of a compound contains 5.51 g of iron, Fe, 1.02g of phosphorus, P, and oxygen, O.

An empirical formula tells us the relative ratios of different atoms in a compound.

We need to calculate the number of moles:

Given data:

Mass of iron - 5.51 g

Mass of phosphorus -1.02g

Mass of oxygen -2.1 g

Moles of iron - [tex]\frac{mass}{molar \;mass}[/tex]

Moles of iron - [tex]\frac{5.51 g}{56 g/mol}[/tex]

0.098 mole

Moles of phosphorus [tex]-\frac{mass}{molar \;mass}[/tex]

Moles of phosphorus -  [tex]\frac{1.02g}{31 g/mol}[/tex]

0.032 moles

Moles of oxygen -[tex]\frac{mass}{molar \;mass}[/tex]

Moles of oxygen - [tex]\frac{2.1 g}{16 g/mol}[/tex]

0.13moles

Dividing each mole using the smallest number that is divided by 0.032moles.

Fe:P:O :: 3:1:4

The empirical formula for the compound is [tex]Fe_3PO_4[/tex].

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[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]

[tex]\qquad \texttt {Observe a natural phenomenon}[/tex]

____________________________________

[tex] \large \tt Explanation \: : [/tex]

At first scientists/researchers observe a natural phenomenon. after enough observation, they make predictions why that phenomenon is happening and the reasons that lead to that particular phenomenon. then they generate scientific hypothesis to explain that phenomenon and after getting enough data they develop tests and perform experiments. And check the results they get and at last based on the results they conclude what actually is happening.

Answered by : ❝ AǫᴜᴀWɪᴢ ❞

Answer:

Quadruple

Explanation:

Answer:

A

Explanation:

Answer: There is a very large percentage of C-12.

Explanation:

The atomic mass is must closer to that of C-12 than of C-13, meaning that there is a much larger percentage of C-12.

Answer:

chuma ya ndoshi.............

Explanation:

.

kwenda ukalale .............

Answer: D. The energy needed to change a liquid into a gas

Answer:

According to me end point is the end of a reaction

Answer: a = 2 ; f = 5 ; b = 2 ; g = 2 ; c = 2 ; h = 2 ; d = 4 ; i = 5 ; e = 3 ; j = 7

Explanation: Some rules to follow while calculating sig figs is

1. If a number like 4500 is present, only two sig figs are counted, but none of the zeros are, but if 4500. has a decimal point present, then you should count all the numbers available.

2. If a number like .0005 is present, only count 5 as a sig fig, however if the number is .00050, count the 0 after the 5 in this example (this would then have two sig figs.

Answer: B and E are True

Explanation:

Because Fe has a higher oxidation potential than H2, H+ can oxidize it.

[tex]$\begin{array}{llllll}\mathrm{Fe} & \rightarrow & \mathrm{Fe}^{2+} & +2 \mathrm{e}- & \mathrm{E}^{0}=0.44 \mathrm{~V} \\ \mathrm{H} & \rightarrow & \mathrm{H}^{+} & + & \mathrm{e}^{-} & \mathrm{E}^{0}=0 \mathrm{~V}\end{array}$[/tex]

Ni can reduce Br2 because the reduction potential of Ni is more than Br2.

[tex]\mathrm{Ni}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Ni}^{-} \quad \mathrm{E}^{0}=-0.25 \mathrm{~V}\\2 \mathrm{Br}^{-} \quad \rightarrow \mathrm{Br}_{2}+2 \mathrm{e}^{-} \quad \mathrm{E}^{0}=-1.087 \mathrm{~V}$[/tex]

Aluminum can be oxidized by [tex]Li^{+}[/tex] and [tex]Ca^{2+}[/tex]

Some of the metal corrodes (or oxidizes) and forms the corresponding metal oxide on the surface as a result of a chemical reaction between the metal surface and the oxygen in the air. The corrosion products that occur in some metals, like steel, are highly apparent and loose.

According to reactivity series (The array of metals in the descending order of their reactivities is referred to as the metals' reactivity series. It is sometimes referred to as the metals in the activity series.)

Lithium and calcium ions are more reactive than aluminum ion and they are less electronegative.

Since silver and tin are more electronegative than aluminum so, they cannot oxidize aluminum.

∴ [tex]Li^{+}[/tex] and [tex]Ca^{+2}[/tex] ions can oxidize aluminum.

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