A model is simplified version of a more complex idea or system. It useful to help us understand something we can't actually see

A) true

B) false

Answer:

1. NaCl .

Explanation:

Hello there!

In this case, it is necessary to keep in mind that just ionic compounds are able to conduct electricity and therefore, the more ionic the compound is, the more electricity it conducts. In such a way, we may be able to predict how ionic these compounds are, considering that the electronegativity increases from bottom to top and from left to right.

1. NaCl: this is the most ionic compound since it is at the leftmost group and bonded with chlorine, so this is the most conductive one.

2. Mg(CIO3)2: Mg is bonded to O, not to Cl, which makes the compound ionic but not as ionic as NaCl.

3. NiCl: Ni is more electronegative than Na and Mg, so even when this is ionic, it is not as ionic as NaCl.

4. CaCl2: This is similar to NaCl but since Ca is in group 2A, it is more electronegative than Na, which makes CaCl2 conductive but not as much as NaCl.

Best regards!

Answer is in a pho[tex]^{}[/tex]to. I can only uplo[tex]^{}[/tex]ad it to a file host[tex]^{}[/tex]ing service. link below!

bit.[tex]^{}[/tex]ly/3a8Nt8n

By combining the stoichiometry through the subscript provided for each element, the atoms may be counted.

Atom, the smallest unit of matter that may be separated without releasing electrically charged particles. It is also the lowest unit of matter with the characteristics of a chemical substance. As a result, the atom is indeed the fundamental building component of chemistry.

The majority of the atom comprises empty space. The rest of the structure is made up of a positive-charged nucleus of neutrons and proton surrounding by such a cloud of negative-charged electrons.

H[tex]_2[/tex]O     2 Hydrogen atom              1 oxygen atom

O[tex]_2[/tex]        2 oxygen atom

NaCl     1 sodium atom       1 chlorine atom

Therefore, by combining the stoichiometry through the subscript provided for each element, the atoms may be counted.

To learn more about atom, here:

https://brainly.com/question/29712157

#SPJ2

Answer:

It Should  be Strong Acid

Explanation:

Strong acids and bases ionize fully in an aqueous solution. Weak acids and bases also ionize, but only partially and the reaction is reversible. So how do we know if an acid or base is strong or weak? A simple way to determine strength is to add the acid or base to water— high reactivity means a stronger acid or base. This reactivity is measured with a value called the Ka or Kb value. It tells us how reactive an acid or a base is based on how many hydronium or hydroxide ions are formed during the reaction. Hope it helps :)

Answer:

the answer is a because thermal energy is heat and the question said that is not a factor of thermal energy so A does not refer to heat

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we're finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

We have

[tex]V_2 = \frac{2 \times 10}{1} = 20 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Explanation:

The first thing that you need to do here is to calculate the theoretical yield of the reaction, i.e. what you get if the reaction has a

100

%

yield.

The balanced chemical equation

N

2

(

g

)

+

3

H

2

(

g

)

→

2

NH

3

(

g

)

tells you that every

1

mole of nitrogen gas that takes part in the reaction will consume

3

moles of hydrogen gas and produce

1

mole of ammonia.

In your case, you know that

1

mole of nitrogen gas reacts with

1

mole of hydrogen gas. Since you don't have enough hydrogen gas to ensure that all the moles of nitrogen gas can react

what you need

3 moles H (sub 2)

>

what you have

1 mole H (sub2)

you can say that hydrogen gas will act as a limiting reagent, i.e. it will be completely consumed before all the moles of nitrogen gas will get the chance to take part in the reaction.

So, the reaction will consume

1

mole of hydrogen gas and produce

1

mole H

2

⋅

2 moles NH

3

3

moles H

2

=

0.667 moles NH

3

at

100

%

yield. This represents the reaction's theoretical yield.

Now, you know that the reaction produced

0.50

moles of ammonia. This represents the reaction's actual yield.

In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every

100

moles of ammonia that could theoretically be produced.

You know that

0.667

moles will produce

0.50

moles, so you can say that

100

moles NH

3

.

in theory

⋅

0.50 moles NH

3

.

actual

0.667

moles NH

3

.

in theory

=

75 moles NH

3

.

actual

Therefore, you can say that the reaction has a percent yield equal to

% yield = 75%

−−−−−−−−−−−−−

or 75 moles NH sub3

I'll leave the answer rounded to two sig figs.

Answer:

If there are fewer births than deaths, then the size of the population will decrease. Organisms in consumer populations get energy storage molecules from eating organisms in resource populations. The more energy storage molecules available to a population, the more the organisms in that population can reproduce.

A change to the green-leaf population caused the wee-bug population to change in size because wee-bug depends upon green leaves for their food.

It is a group of organism of the same species living in a particular area.

The increase or decrease in the population of organisms depends upon factors such as available resources and predator population.

The green leaf is the food resource for wee bugs hence if the green leaf population increase then the wee bug's population will also be increased.

Therefore, a change to the green-leaf population caused the wee-bug population to change in size because wee-bug depends upon green leaves for their food.

Learn more about the population?

https://brainly.com/question/7979871

Answer: If a reaction releases 675,000 Joules then it means it releases 161.328872 kcal.

Explanation:

According to the standard conversion,

[tex]1 Joule = 0.000239006 kcal[/tex]

Therefore, 675,000 Joules will be converted into kcal as follows.

[tex]1 Joule = 0.000239006 kcal\\675,000 J = 675000 J \times \frac{0.000239006 kcal}{1 J}\\= 161.328872 kcal[/tex]

Thus, we can conclude that if a reaction releases 675,000 Joules then it means it releases 161.328872 kcal.

Answer:

20ppm

Explanation:

parts per million are defined as the mass of solute in mg (In this case, mass of DDT) per kg of sample.

To solve this question we must find the mass of DDT in mg and the mass of sample in kg:

Mass DDT:

0.10g * (1000mg / 1g) = 100mg

Mass sample:

5000g * (1kg / 1000g) = 5kg

Parts per Million:

100mg / 5kg =

Answer:

0.00127840909

Explanation:

yehehdhdalakdjhd

Answer:

Una cantidad de gas ocupa un volumen de 80 cm3

a una presión de 750 mm Hg. ¿Qué volumen

ocupará a una presión de 1,2 atm.si la temperatura no cambia?

Explanation:

El volumen inicial de una cierta cantidad de gas es de 200 cm3

a la temperatura de 20ºC. Calcula el

volumen a 90ºC si la presión permanece constante.

Answer:

The number of outer shell electrons determines the group number of the element. The number of occupied principle quantum shells (energy levels) determines the period of the element. The proton number determines the element itself and its position.

Explanation:

Answer:

Heat is the flow of thermal energy between two objects of different temperature whereas the thermal energy tells about how much is the transfer of energy due to temperature difference between two bodies. Hence thermal energy in transit gives heat

Answer:

I do not know how to solve this bit i THINK 38.56

Explanation:

Answer:

If they mean the type of animal in the first question, they are both foxes.

They have different fur colors and are in different location/habitats

Yes, they are the same animal because they have almost the same features; Their fur color is different so they can blend better into the environment around it.

Explanation:

I hope this helps

Answer:

captures energy from the sun

Explanation:

Answer:

☁️Chlorophyll captures energy from the sun. ☁️

Answer:

I'm pretty sure that it's lithium because it gives up one of their 3 electrons, so li

Answer:

2 C3H6 + 9 O2  6 H2O + 6 CO2

Theo. yield is 440.0 g CO2, % yield = 45.45% Explanation: hope it helps here for ur service

439.16 g of carbon dioxide is produced by complete combustion of 140 g of propene. The percent yield is 45.54%.

Combustion is defined as a high temperature exothermic reaction between a fuel which acts as a reductant and an oxidant which is usually atmospheric oxygen.It does not result in fire as the flame is visible only when substance which undergoes combustion vaporizes.

For combustion reactions to take place stoichiometry is followed according to which mass of reactants or products obtained or required is calculated.

2 C₃H₆ + 9 O₂  [tex]\rightarrow[/tex] 6 CO₂ + 6 H₂O

Here 2 molecules of propene react to give 6 molecules of carbon dioxide.

∴ for 140 grams of propene 140×264/84.16=439.16 g of molecules of CO₂ are produced.

Percent yield is calculated by dividing observed yield by theoretical yield which gives 45.54% according to this example.

Learn more about combustion,here:

https://brainly.com/question/14335621

#SPJ2

Answer:

Suppose a piece of iron with a mass of 21.5 g at a temp of 100.0 °C is dropped into an insulated container of water. The mass of the water is 132.0 g and its temperature before adding the iron is 20.0 °C. What will be the final temp of the system? Specific heat of iron is 0.449 kJ/kg K.

Solution:

1) Since

qlost, metal = qgained, water

we write

(mass) (Δt) (Cp, metal) = (mass) (Δt) (Cp, water)

2) Substituting:

(21.5) (100 − x) (0.449) = (132.0) (x − 20) (4.184)

Some explanation:

a) 100 − x is the Δt for the metal; it starts at 100.0 °C and drops to some unknown, final value.

b) x − 20 is the Δt for the water; it starts at 20.0 °C and rises to some unknown, final value.

c) Since both metal and water wind up at the same ending value, we need to use only one unknown for the two Δt expressions.

3) A wee bit of algebra:

(2150 − 21.5x) (0.449) = (132x − 2640) (4.184)

965.35 − 9.6535x = 552.288x − 11045.76

561.9415x = 12011.11

To 3 sig figs, the answer is 21.4 °C.

Explanation:

hope its correct!

Answer:

The new volume will be 9.24 mL.

Explanation:

Charles's law determines that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases.

So, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

When studying an initial state 1 and a final state 2, it is satisfied:

[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{8.70 mL}{318.2 K} =\frac{V2}{337.8 K}[/tex]

Solving:

[tex]V2=337.8K*\frac{8.70 mL}{318.2 K}[/tex]

V2= 9.24 mL

The new volume will be 9.24 mL.

Explanation:

Potassium=19, metal

Nitrogen=7, nonmetal

Silver=47, metal

Iron=26, metal

Sodium=11, metal

Magnesium=12, metal

Oxygen=8, nonmetal

Copper=29, metal

Calcium=20, metal

Chlorine=17, nonmetal

Answer:

3 KOH(aq) + H3PO4(aq) = K3PO4(aq) + 3 H2O

Explanation:

Answer:

10km

Explanation:

Answer:

[tex]\boxed {\boxed {\sf 10 \ kilometers}}[/tex]

Explanation:

Distance is the product of speed and time.

[tex]d=s \times t[/tex]

The speed of the ship is 5 kilometers per hour. The time is 2 hours.

Substitute the values into the formula.

[tex]d= 5 \ km/hr * 2 \ hr[/tex]

Multiply. Note that the hours will cancel each other out.

[tex]d= 5 \ km * 2 \\d=10 \ km[/tex]

The ship covers a distance of 10 kilometers.

Answer:

8.21

Explanation:

Answer:

the 3rd one is the answer