What is the charge and size of electrons? *

Answer:

Explanation:

The two properties that make a metal a good choice to use a wire in electronics are :

Answer:

A I took this quiz today and got it right.

Answer:

The answer is B Isotopes

Answer:

The answer is D Bill Bass

Explanation:

Remember it from the lesson and I took the test.

Answer:

It takes 6h to the radioactive source decrease its activity from 200 to 25

Explanation:

The equation that describes the readioactive decay is:

Ln [A] = -kt + Ln [A]₀

Where [A] could be taken as activity of the source after time t, [A]₀ is initial activity and k is decay constant.

Decay constant could be written as:

k = ln2 / Half-life

k = ln 2 / 2h

k = 0.3466h⁻¹

Replacing in decay equation:

Ln [25] = -0.3466h⁻¹t + Ln [200]

-2.0794 = -0.3466h⁻¹t

6h = t

It takes 6h to the radioactive source decrease its activity from 200 to 25

Answer:

particle size

Explanation:

because except that all are the examples that the speed of dissolving can be changed

Answer:

Adding water

Explanation:

When a solid is dissolving the speed cannot be changed by adding water

Answer:

Double replacement is the answer

Answer:

Phosphorus Trichloride, water and carbon dioxide

Answer:

I think its B im not sure lol but I would wait for someone that actually would know for sure

Different fractions are combined to make a variety of final products during  the treatment step in refining crude oil for energy use. Therefore, the correct option is option B.

A material or a form is purified by the process of refining, which is also maybe referred to by the mathematical word affixing. The phrase is typically used to describe a resource that is practically useable but is more valuable in its purest form.

The phrase refers to a wide range of changes, including more extreme ones as the conversion of ore to metal (for more information, see Refining (metallurgy)). Different fractions are combined to make a variety of final products during  the treatment step in refining crude oil for energy use.

Therefore, the correct option is option B.

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Answer:

Hypothesis---experiments----results----conclusion.

Explanation:

First we make a hypothesis means a statement about why the tree looks unhealthy. In this segment of scientific method we have to test the hypothesis through experimentation. After that we have to take the readings of various parts of the tree and analyze the data to find out the problem. In the next step, we have to made the results on the basis of the data that is obtained. In the last we have to write the conclusion of the analysis and see the hypothesis.

Answer:

top one is anaphase and the middle one is cytokinesis can't see enough of the bottom one to tell

Explanation:

Answer:

C. 80g  Nano3 at 10 degrees Celsius

Explanation:

I just took the test

80 g NaNO₃ at 10 degrees Celsius of a compound dissolved in 100 grams of water at the stated temperature represents a system at equilibrium. Therefore, option C is correct.

The maximum quantity of a chemical that will dissolve in a given amount of solvent at a particular temperature is referred to as its solubility.

Different compounds have very varying solubilities, which is a feature of a particular solute-solvent pair.

A substance's physical and chemical characteristics affect how soluble it is. A few other factors and circumstances can also influence it. A few of these are: temperature, pressure, kind of binding, and forces between the particles.

A system is said to be in equilibrium when 80 grammes of a substance, dissolved in 100 grams of water at 10 degrees Celsius.

Thus, option C is correct.

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Answer: The final temperature of the mixture will be [tex]2.5^0C[/tex]

Explanation:

[tex]heat_{absorbed}=heat_{released}[/tex]

As we know that,  

[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]

[tex]m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)][/tex]         .................(1)

where,

q = heat absorbed or released

[tex]m_1[/tex] = mass of first sample of ethanol = 100 ml

[tex]m_2[/tex] = mass of second sample of ethanol = 300 ml

[tex]T_{final}[/tex] = final temperature = ?

[tex]T_1[/tex] = temperature of  first sample of ethanol  = [tex]25^oC=298K[/tex]

[tex]T_2[/tex] = temperature of second sample of ethanol  = [tex]-5^oC=268K[/tex]

[tex]c_1[/tex] = [tex]c_2[/tex] = specific heat of ethanol

 Now put all the given values in equation (1), we get

[tex]-100\times (T_{final}-298)=[300\times (T_{final}-268)][/tex]

[tex]T_{final}=275.5K=2.5^0C[/tex]

Therefore, the final temperature of the mixture will be [tex]2.5^0C[/tex]

Answer:

The answer is divergent

Answer:

10

s=8

o=2

Hope it helps to

Answer: [tex]Mg(s)+Zn(NO_3)_2(aq)\rightarrow Mg(NO_3)_2(aq)+Zn(s)[/tex]

Explanation:

Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.

Net ionic equation : In the net ionic equations, we do not not include the spectator ions in the equations.

Spectator ions are the ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The equation given is:

[tex]Mg(s)+Zn^{2+}+2NO_3^-\rightarrow Mg^{2+}+2NO_3^-+Zn(s)[/tex]

The complete molecular equation will be:

[tex]Mg(s)+Zn(NO_3)_2(aq)\rightarrow Mg(NO_3)_2(aq)+Zn(s)[/tex]  

The complete ionic equation of[tex]\rm Mg(s) + Zn^{2+} + 2NO_3 \rightarrow Mg^{2+} + 2NO_3 + Zn(s)[/tex] is[tex]\rm Mg(s) + Zn^{2+} \rightarrow Mg^{2+} + Zn(s)[/tex]. So, option A is right.

A complete ionic equation shows all of the ions that are present in a reaction, including the spectator ions. In this reaction, magnesium metal (Mg(s)) reacts with zinc(II) ions ([tex]\rm Zn^2+[/tex]) to form magnesium(II) ions ([tex]\rm Mg2+[/tex]) and zinc metal (Zn(s)).

The balanced molecular equation for this reaction is:

[tex]\rm Mg(s) + Zn(NO_3)_2(aq) \rightarrow Mg(NO_3)_2(aq) + Zn(s)[/tex]

The complete ionic equation is:

[tex]\rm Mg(s) + Zn^{2+}(aq) \rightarrow Mg^{2+}(aq) + Zn(s)[/tex]

The spectator ions are the nitrate ions ([tex]\rm NO_3^-[/tex]), which are present on both sides of the equation. They do not participate in the reaction, so they are not included in the complete ionic equation.

The other choices are incorrect because they do not show all of the ions that are present in the reaction.

Therefore, the answer is A. [tex]\rm Mg(s) + Zn^{2+} \rightarrow Mg^{2+} + Zn(s)[/tex].

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Answer:

Refresh your page or if that doesn't work, close your tab and try to click it again or restart your pc

Explanation:

Answer:if you can't close the tabs I suggest try and restart the computer

Explanation:

Answer:

2.4 mole of oxygen will react with 2.4 moles of hydrogen

Explanation:

As we know

1 liter = 1000 grams

2H2 + O2 --> 2H2O

Weight of H2 molecule = 2.016 g/mol

Weight of water = 18.01 gram /l

2 mole of oxygen react with 2 mole of H2

2.4 mole of oxygen will react with 2.4 moles of hydrogen

Answer:

41.88375 g Fe

Explanation:

Using stoichiometry, we can do this problem. First, we put our given. Then we create an equation using the molar mass of Fe (found on the periodic table, which was 55.845 g Fe), and the resulting equation is:

[tex]0.75 mol Fe * \frac{55.845 g Fe}{1 mol Fe}[/tex]

The mol Fe's cancel, and leave us with:

41.88375 g Fe

Good luck.

their roots need room to spread out

Answer: Filtration technique

Explanation:

The technique used here is called filtration.

Filtration,is a physical separation process that separates a mixture of an insoluble solid from a liquid ( acting as the solvent) by the use of a filter barrier that allows only the fluid to pass through.

In the case from the question,

As water is poured over the ground coffee, it forms a mixture of which the insoluble solid is the coffee grounds, the water is the liquid  and the filter barrier is the piece of paper  which allows only the brown  liquid coffee to pass through as the filtrate.

↪ Hello miss "galaxyu035" here's your answer for the question you wrote.

Answer :

No, we cannot stir silver nitrate solution with a copper spoon because , copper is more reactive than silver. Thus,it would displace silver from the silver nitrate solution forming copper nitrate.

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Remember if my answer helps you! Might give me a thank you! By clicking the heart button .

first one: nitrogen

ammonia (NH3)

//

3. sulfur

sulfur dichloride (SCl2)

//

4. neither (xenon is a noble gas)

//

5. fluorine

hydrogen monoflouride (HF)

//

I'm not too confident with my naming skills but the chemical formula should be right.

2 × 10²⁴ atoms Co

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

4 mol Co (Cobalt)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 1 sig fig.

2.4088 × 10²⁴ atoms Co ≈ 2 × 10²⁴ atoms Co

Answer: Sodium is the metal reacts vigorously with oxygen and water.

Explanation:

sodium

amount of work done is equal to l/h

so 50/3=16.66667

round your ans to 2 significant figure

so your ans will be 17m/kg

Answer:

thanks for share to use a brainly tutor or if any help... I want to say is the answer would be: 800 cm ^3

Explanation:

thank you!

have a great week

The volume is generally measured in Liters, milliliters, cm³, m³, etc. At constant pressure and temperature, the volume produced by six tablets will be 1200 cm³. The correct option is A.

The term volume denotes the capacity that an object can hold. For example if a beaker can hold 100 mL of water then the volume of the beaker is said to be 100 mL. It is represented by the symbol 'V'.

The three dimensional space occupied by the matter is given by the term volume. The SI unit of volume is m³.

Here the volume of three tablets is 600 cm³. Then the volume of one tablet is:

V = 600 / 3 = 200 cm³

Hence the volume produced by six tablets is:

V = 200  × 6 = 1200 cm³.

Thus the volume of six tablets is  1200 cm³.

Thus the correct option is A.

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