Answer:
THE ANSWER IS A
Explanation:
In a synthesis reaction, the elements Fe and S might react to form FeS.
Given :
The elements Fe and S might react to form a product,
To find:
The product of the synthesis reaction.
Solution:
The synthesis reaction is a type of chemical reaction in which two more different substances are combined together to give a single product,
When iron (Fe) and sulfur react the product will be formed will have both iron atoms and sulfur atoms.
[tex]Fe+S \rightarrow FeS[/tex]
In a synthesis reaction, the elements Fe and S might react to form FeS.
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What was the oxygen crisis
A town is looking at multiple solutions for its beach erosion problem. Which factors of beach nourishment should the town consider when making a decision? Select the two correct answers.(1 point)
how they will pay for the cost of the project
how long beaches will be closed during the project
how many people drive near the beaches
how long it will take the new sand to dry
how cold the water temperature is at the time of pumping
Answer:
d
Explanation:
The factors of beach nourishment should the town consider to tackle erosion problem include:
how long it will take the new sand to dry.how cold the water temperature is at the time of pumping.What is erosion?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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Which major scientist major contribution was to develop the theory of evolution? (100 points)
Answer:
Alfred Russel Wallace
The temperature and pressure both increased when you decreased the volume of the container.
O True
O False
what is chemical equilibrium and Le chatelier's principle
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.
How are the chemical properties of a substance related to the chemical changes that the substance
undergoes?
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 :)
draw an energy diagram for an endothermic and exothermic reaction and label the diagram
The energy diagram for an endothermic reaction and exothermic reaction are attached in attachments below.
What are endothermic and exothermic reactions?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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1. Calculate the number of moles of oxygen atoms present in 1.50 mol of barium sulfate.
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.
Which statement best explains why heating a liquid affects its viscosity?
The molecules move faster at higher temperatures and overcome attractions more easily.
The molecules move faster at higher temperatures, and the attractions between them increase.
The molecules move slower at higher temperatures and overcome attractions more easily.
The molecules move slower at higher temperatures, and the attractions between them decrease.
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.
which property of physical changes explains why matter is conserved in a physical change
Answer:
b
Explanation:
A mixture contains NaHCO3 together with unreactive components. A 1.75 g sample of the mixture reacts with HA to produce 0.561 g of CO2. What is the percent by mass of NaHCO3 in the original mixture?
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:
The molar mass of CO₂ is 44.01 g/mol.The molar ratio of NaHCO₃ to CO₂ is 1:1.The molar mass of NaHCO₃ is 84.01 g/mol.[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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Gravity would cause the rain falling in which two locations to drain into the area B
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.
How does gravity affect rainfall?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.
What makes scientific investigations different from other types of investigations?
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.
Compare and contrast cations and anions and give an example of each.
Cations are positively charged particles while anions are negatively charged particles. They both have different forces therefore they are attract each other.
What is cation ?
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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2. Calculate the de Broglie wavelength of an electron moving at 1/137th the speed
of light. (At this speed, the relativistic correction to the mass is negligible
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.
What is de Broglie wavelength ?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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Which describes a characteristic of quartzite? Don't check all that apply.
igneous
foliated
does not split into layers
grains arranged in parallel layers
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.
TCDD, also called dioxin (C12H4Cl4O2, molar mass 322.0 g/mol), is a potent poison. The average lethal dose in humans is estimated to be 3.0 × 10−2 mg per kg of body weight. (a) How many grams constitute a lethal dose for a 84−kg individual?(b) How many molecules of TCDD does this correspond to?
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)
It is much more difficult to diagnose a
disorder than a
one.
Answer:
disorder examples: eating disorders
Explanation:
dont understand this question fully but hope this helps
The energy change in an endothermic reaction is:
A. Internal
B. Positive
C. External
D. Negative
Thank you so much for helping !
The energy change in an endothermic reaction is internal. Hence, option A is correct.
What is an endothermic reaction?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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how many hydrogen atoms would be present in 12 molecules of water (h2o)?
3
2
24
12
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:
Which of the following would be the
best tool to use when heating substances
for experiments?
A cardboard boxes
B. plastic beakers
C plastic test tubes
D. glass beakers
Brittleness
Hardness
Elasticity
Conductivity
Biodegradability
1. Ability to break easily.
2. Ability to decomposed by microorganism.
3. Ability to let the heat and electricity to pass through.
4. Ability to be stretched and return to its original shape.
5. Ability to resist pressure that may cause deformation.
Answer:
BrittlenessBiodegradableConductivityElasticityHardnessCan I get BRAINLIEST.... Please