who knows this........​

Answer:

B. Patterns can help explain observations.

Explanation:

Hope this helps

Answer:

B. Patterns can help explain observations.

Explanation:

a p e x 2021 :) Have a nice day everyone!

Answer:

The transponder

Explanation:

Answer:

Transducer

Explanation:

Transponder was incorrect and made me lose points on the test.

Explanation:

speed of light is 3×10^8 m/ s

1/137 of 3 × 10^ 8 m/s ( u get the speed the electron was moving with)

mass of electron 9.109× 10^-31 kg( i think we consider the mass of electron if the relativistic correction of the mass is negligible)

then from de Broglie wavelength= h/ mv

h is planck constant 6.626 × 10^-34

substitute the valies and you get the answer

am sorry I don't have my calculator with me I wuld hv written the answer bt I hope this helps

The de Broglie wavelength of an electron moving at 1/137th the speed of light is 0.24 × 10¹¹m.

The term de Broglie wavelength defined as the wavelength (λ) that is associated with an object in relation to its momentum and mass.

De Broglie wavelength is mostly represented by the symbol λ or λdB. For a particle with momentum p, the de Broglie wavelength is known as λdB = hp. where h is the Planck constant.

The speed of light = 3×10^8 m/ s

1 / 137 × 3 × 10^ 8 m/s

The mass of electron 9.109× 10^-31 kg

then from de Broglie wavelength

= h / mv

Where,

h is Planck constant 6.626 × 10^-34

substitute the values in above equation

We get,

=  6.626 × 10⁻³⁴ / 9.109 × 10⁻³¹ × 3×10⁸

= 0.24 × 10¹¹m

Thus, The de Broglie wavelength of an electron moving at 1/137th the speed of light is 0.24 × 10¹¹m.

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Answer:

Volume (v) = 10 cm^3

Mass (m) = 8g = 8/1000 kg = 0.008 (SI unit of mass is kg)

Density (D) = ?

Now,

D = m/v = 0.008/10 = 0.0008

Answer:

Can I get BRAINLIEST.... Please

Answer:

[tex]\%NaHCO_3=61.2\%[/tex]

Explanation:

Hello.

In this case, since the undergoing chemical reaction is only between the sodium bicarbonate and the acid HA:

[tex]NaHCO_3+HA\rightarrow NaA+H_2O+CO_2[/tex]

For 0.561 g of yielded carbon dioxide (molar mass 44 g/mol), the following mass of sodium bicarbonate (molar mass 84 g/mol) that reacted was:

[tex]m_{NaHCO_3}=0.561gCO_2*\frac{1molCO_2}{44gCO_2} *\frac{1molNaHCO_3}{1molCO_2} *\frac{84gNaHCO_3}{1molNaHCO_3} \\\\m_{NaHCO_3}=1.071g[/tex]

Considering the 1:1 mole ratio between CO2 and NaHCO3. Finally, the percent by mass of NaHCO3 is computed by dividing the mass of reacted NaHCO3 and t the mixture:

[tex]\%NaHCO_3=\frac{1.071g}{1.75g}*100\%\\ \\\%NaHCO_3=61.2\%[/tex]

Best regards.

A 1.75 g sample of the mixture of NaHCO₃ together with unreactive components, that reacts with HA to produce 0.561 g of CO₂, has 61.1% by mass of NaHCO₃.

Let's consider the reaction between NaHCO₃ and HA (generic acid).

NaHCO₃ + HA → NaA + H₂O + CO₂

We can calculate the mass of NaHCO₃ that produced 0.561 g of CO₂ using the following conversion factors:

[tex]0.561gCO_2 \times \frac{1molCO_2}{44.01gCO_2} \times \frac{1molNaHCO_3}{1molCO_2} \times \frac{84.01gNaHCO_3}{1molNaHCO_3} = 1.07 g NaHCO_3[/tex]

There are 1.07 g of NaHCO₃ in 1.75 g of the mixture. The percent by mass of NaHCO₃ in the mixture is:

[tex]\%NaHCO_3 = \frac{1.07g}{1.75g} \times 100\% = 61.1\%[/tex]

A 1.75 g sample of the mixture of NaHCO₃ together with unreactive components, that reacts with HA to produce 0.561 g of CO₂, has 61.1% by mass of NaHCO₃.

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Answer:

Two water molecules contain 4 hydrogen atoms and 2 oxygen atoms. A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.

Explanation:

Answer:

[tex]n_{CO_2}=0.119molCO_2[/tex]

[tex]m_{CO_2}=5.24gCO_2[/tex]

Explanation:

Hello.

In this case, since the chemical reaction:

[tex]NaHCO_3+CH_3COOH\rightarrow CH_3COONa+H_2O+CO_2[/tex]

And 10.0 grams of sodium bicarbonate (molar mass = 84 g/mol) are reacting in a 1:1 mole ratio with the yielded carbon dioxide, those moles and grams turn out:

[tex]n_{CO_2}=10.0gNaHCO_3*\frac{1molNaHCO_3}{84gNaHCO_3} *\frac{1molCO_2}{1molNaHCO_3} =0.119molCO_2[/tex]

And the mass by considering the molar mass of carbon dioxide to be 44 g/mol:

[tex]m_{CO_2}=0.119molCO_2*\frac{44gCO_2}{1molCO_2} \\\\m_{CO_2}=5.24gCO_2[/tex]

Best regards.

If you start using 10.0 grams of sodium bicarbonate and excess of acetic acid, you can obtain 0.119 moles of CO₂ (5.24 g).

Let's consider the following neutralization reaction.

NaHCO₃ + CH₃COOH ⇒ CH₃COONa + H₂O + CO₂

First, we will convert 10.0 g of NaHCO₃ to moles using its molar mass (84.01 g/mol).

[tex]10.0 g \times \frac{1mol}{84.01g} = 0.119mol[/tex]

The molar ratio of NaHCO₃ to CO₂ is 1:1. The moles of CO₂ formed from 0.119 moles of NaHCO₃ are:

[tex]0.119 mol NaHCO_3 \times \frac{1molCO_2}{1molNaHCO_3} = 0.119 moles CO_2[/tex]

Finally, we will convert 0.119 moles of CO₂ to grams using its molar mass (44.01 g/mol).

[tex]0.119 mol \times \frac{44.01g}{mol} = 5.24 g[/tex]

If you start using 10.0 grams of sodium bicarbonate and excess of acetic acid, you can obtain 0.119 moles of CO₂ (5.24 g).

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Answer: The molecules move faster at higher temperatures and overcome attractions move easily.

Explanation: edgen. 2020

Answer:

It's A !

The molecules move faster at higher temperatures and overcome attractions more easily.

Answer:

the answer is " does not split into layers"

Explanation:

Quartzite is a non-foliated metamorphic rock and non-foliated rocks have their mineral grains arranged randomly.

Answer:

Sientific invesigations are different from other investigations because scientific investigations are not and can not be controlled at all.

Explanation:

Scientific investigations are investigations in science that can not have a independent variable and dependent variable in them. these types of investigation is where you observe something and write down the observations.

Answer:

4 and 3

because i guessed

Gravity would cause the rain falling in (3) and (4) locations to drain into area B. thus these locations are most near to basin area B.

Through watersheds, gravity forces water to flow down on the land and precipitation to fall from clouds. The constant circulation of water between these reservoirs is powered by gravity and solar energy. The water turns from a liquid to a gas as it becomes hotter.

Rainfall can be significantly influenced by mountains. Air must rise to overcome this obstruction once it reaches the mountains. A mountain's windward side causes the air to cool and lose volume as it ascends. As a result, humidity rises, and precipitation and orographic clouds may form.

The image is attached below.

Therefore, these locations are most near basin area B.

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The given question is incomplete, so the most probable complete question is attached in the image.

Answer:

Other physical properties, such as the melting temperature of iron or the freezing temperature of water, can only be observed as matter undergoes a physical change. ... In each of these examples, there is a change in the physical state, form, or properties of the substance, but no change in its chemical composition.

Explanation:

i hope this helps :)

Answer:

Physical weathering is caused by the effects of changing temperature on rocks, causing the rock to break apart.

Explanation:

Freeze-thaw occurs when water continually seeps into cracks, freezes and expands, eventually breaking the rock apart.

Cations are positively charged particles while anions are negatively charged particles. They both have different forces therefore they are attract each other.

Positively charged ions are known as cations. Negatively charged ions are referred to as anions. A charged atom or molecule is an ion. A balanced atom will become a positively charged cation if it loses one or more electrons.

An ion that has lost one or more electrons and now has a net positive charge is said to be a cation. The cation of an atom is smaller than the neutral atom because one or more electrons are taken out to produce a cation.

As an electron donor, the cathode has the potential to initiate reduction. Positive ions from the solution will be drawn to the negatively charged electrode by its charge. It can provide some of the extra electrons it has to these cations or other species in the electrolyzing liquid.

Thus, Cations and anions both have different forces therefore they are attract each other.

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Answer:

disorder examples: eating disorders

Explanation:

dont understand this question fully but hope this helps

Answer:

d

Explanation:

The factors of beach nourishment should the town consider to tackle erosion problem include:

It should be noted that erosion simply means the washing away of the top soil by erosional agents.

In this case, the town should take into consideration how long it will take the new sand to dry and how cold the water temperature is at the time of pumping. This is important to replenish lost nutrients.

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The energy  diagram for an endothermic reaction and exothermic reaction are attached in attachments below.

An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.

In an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the exothermic reaction is less than the net amount which is released by the reaction.

An endothermic reaction is defined as a chemical reaction which is a thermodynamic process accompanied by an increase in enthalpy of the system.In this process, a system absorbs energy from the surroundings which is mainly thermal energy.

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Answer:

Iron

Explanation:

The energy change in an endothermic reaction is internal. Hence, option A is correct.

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

A reaction or process in which heat is transferred to a system from its surroundings is endothermic.

The first law of thermodynamics states that the energy of the universe is constant.

The change in the internal energy of a system is the sum of the heat transferred and the work done.

Hence, option A is correct.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

From the question

mass = 50 kg

acceleration = 0.8 m/s²

We have

Force = 50 × 0.8

We have the final answer as

Hope this helps you

Answer:

Alfred Russel Wallace

Le Chatelier's principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to reestablish an equilibrium. If a chemical reaction is at equilibrium and experiences a change in pressure, temperature, or concentration of products or reactants, the equilibrium shifts in the opposite direction to offset the change.

In Chemical reaction, the concentration of reactant and products shows no net change over the time is called as chemical equilibrium.

Given parameters:

Weight of hydrated sample  = 20g

Temperature = 250°C

Weight after cooling  = 16.5g

Unknown:

Weight of water lost from the sample = ?

Solution:

The weight of water lost from the sample;

    Weight of water lost = Weight of hydrated sample - Weight of dry sample

    Weight of water lost = 20g - 16.5g  = 3.5g

% of water in the sample = [tex]\frac{mass of water}{mass of original sample} x 100[/tex]

  Input parameters solve;

                              = [tex]\frac{3.5}{20} x 100[/tex]

                               =17.5%

Answer:

The correct solution is "3.535 × 1018 molecules".

Explanation:

The given values are:

Molar mass

= 322.0 g/mol

Dioxin constitute to 63 kg individual will be:

= [tex]0.03 \ mg\times 63[/tex]

= [tex]1.89 \ mg[/tex]

⇒  [tex]mole=\frac{mass}{molar \ mass}[/tex]

             [tex]=\frac{ 1.89\times 10^{-3}}{322}[/tex]

             [tex]=5.87\times 10^{-6} \ mol[/tex]

So,

The number of molecules will be:

= [tex]mole\times Na[/tex]

= [tex]5.87\times 10^{-6}\times 6.022\times 1023[/tex]

= [tex]3.535\times 1018[/tex] (molecules)

Answer:

b

Explanation:

Answer:

[tex]n_O=6.00molO[/tex]

Explanation:

Hello.

In this case, since the molecular formula of barium sulfate is:

[tex]BaSO_4[/tex]

Which has four oxygen atoms, we can also say that one mole of barium sulfate has four moles of oxygen; in such a way, the moles of oxygen atoms in 1.50 moles of barium sulfate are:

[tex]n_O=1.50molBaSO_4*\frac{4molO}{1molBaSO_4} \\\\n_O=6.00molO[/tex]

Best regards.