1. Which of the following describes a biotic influence on population size?
A. Decreased rainfall leads to less space for fish in a pond to live.
B. A fungus causes a disease in cherry trees and leads to those trees dying.
C. A volcano eruption destroys most of a mountain ecosystem.
D. Increased sunlight causes plants to grow more quickly.

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: 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:

Double replacement is the answer

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: [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:

The answer is divergent

Answer:

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

Explanation:

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

Explanation:

Solar energy is the radiant energy emmitted from the Sun. It is the electromagnetic energy

Answer:

A I took this quiz today and got it right.

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:

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

↪ 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 .

Answer:

Increasing ocean temperatures cause current speeds to increase.

Explanation:

As the temperature of ocean increases, the speed of current is also increases because these currents stored more heat energy that leads to the increase in speed of ocean currents. Due to increase in global temperature, global ocean circulation has been increases since 1990s. The main reason for that is the increase in the concentration of greenhouse gases in the atmosphere that increases the temperature of the environment so the speed of ocean currents also increases.

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:

Explanation:

NaCl – Sodium chloride

Other names: {{unbulleted list Saltb Table salt

Appearance: Colorless cubic crystals

CaS – Calcium sulfide

Other names: Calcium monosulfide

Hepar calcies Sulfurated lime

Answer:

The answer is D Bill Bass

Explanation:

Remember it from the lesson and I took the test.

Answer:

10

s=8

o=2

Hope it helps to

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.

Explanation:

It should be seen that perhaps the intensity of Ebony timber is greater than the concentration. This can drown if this is heavier than water, but that will floating whether it is not viscous than air. 

Answer:

they cant relxax or the ball woud not be in your have it would fall bec there is no stranth for your musseles

Explanation:

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.

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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Answer:

Ano po ba grade hirap namn po yan

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

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.