Answer:
The goal of science is compared to engineering because engineering is there to solve problems while science is to explain natural phenomena
Explanation:
Which of the following is a reason for cell division?
Repair of damage to an organism
to get smaller
to make fewer cells
for homeostasis
Answer:
D, to repair the damged cells is noy a reason that cells reproduce by siving in order to maintaon homeostasis.
Explanation:
What are three ways fluid flow is important in the food industry?
what is net ionic equation for the reaction shown below? AgNO3(aq)+NaCl(aq)=AgCl(s)+NaNO3(aq)
The net Ionic equation for the reaction is
Ag⁺+ Cl⁻→ AgCl
The symbolic depiction of a chemical reaction using symbols and equations is known as a chemical equation.Spectator ions are ions that are present on both sides of chemical reactions but do not take part in the reaction itself. The spectator ions on both sides of the equation are cancelled in the net chemical reaction.Steps for writing net ionic equation:
write the balanced chemical equation.Split soluble compounds into ions.cross out the spectator ions on the both side of the ionic equation.Write the remaining substances as net ionic equation.Balanced Chemical equation:
AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)
Splitting
Ag⁺ + NO³⁻ + Na⁺ + Cl⁻ → AgCl + Na⁺ + NO³⁻
Net Ionic Equation
Ag⁺+ Cl⁻→ AgCl
Na⁺ and NO³⁻ are spectator ions, hence they are not included in the net ionic equation. Because it exists in solid form, AgCl cannot be separated into ions.
Therefore, net ionic equation is
Ag⁺+ Cl⁻→ AgCl
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Single Replacement Reactions
Calcium + Lead (II) nitrate →
Answer:
Ca(NO3) + Pb
Explanation:
that,s the proper equation
Summary about helium
Answer: Helium is an type of air that can be used to inflate balloons, balls, and other things that require air. The carbon dioxide we breath out is similar to this helium.
Hope this helps!
Review Questions
O
Esime
After 5 minutes, what
do you expect will
happen to the
temperature of the ice
and water?
Answer
Answer:
el río esta libertad haora
Explanation:
owk7uuur98
88388811111q1
Can we create matter? Why or why not?
Answer:
The first law of thermodynamics doesn't actually specify that matter can neither be created nor destroyed So yes we can create matter because matter is every where buildings ,structures etc. So the answer is yes!
Explanation:
Hope this helped!ヾ(•ω•`)o❤
At 9:00 AM the temperature is 62 degrees and rising. The humidity is 45% and falling. The barometric pressure is rising. What type of weather can you expect for the afternoon?
A.Cold and sunny
B.warm and sunny
C. Cold and rainy
D. Warm and rainy.
Answer:
a....................
an ideal gas exerts a pressure of 2.00 atm at 75.0 oc. calculate the temperature (kelvin) of the gas at a pressure of 5.00 atm. enter your answer as an integer.
The temperature of the gas at a pressure of 5.00 atm. is 597 °C.
Given:
Initial Pressure P1 =2.00 atm.
Initial Temperature T1 = 75 °C =384 K
Final Pressure P2 = 5.00 atm.
Final Temperature T2= ?
Ideal gas equation is given by :
P1V1/ T1 = P2V2/T2
Volume remains constant
P1/T1 = P2/T2
Calculation for Temperature T2:
P1/T1 = P2/T2
2.00 atm. / 348 K =5.00 atm. / T2
T2= 870 K = 597 °C
In chemistry, we define the temperature of a substance as the average kinetic strength of all of the atoms or molecules of that substance. No longer do all of the debris of a substance have identical kinetic strength. At any given time, the kinetic energy of the debris may be represented by means of a distribution.
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What causes the sea floor to move apart at a sea floor spreading center A density B continental drift C paleomagnetism D convection currents
Answer: D convection currents
Explanation:
The seafloor spreading is a phenomena that occurs due to liberation of heat from the convection currents generated in the mantle. It makes the earth crust more plastic and less dense. This happens at divergent plate boundaries. As the plates move apart, the less denser material rises. It leads to the formation of mountain and crust cracks.
A pipet is used to measure out 10 mL of water. If the mass of this volume of water is 9.990 g and the density of water is given as 0.9978 g/mL, what is the actual volume of water measured out? a. 10.000 mL b. 9.990 mL Oc.The actual volume measured out is impossible to tell d. 10.012 mL
The actual volume of water measured out is 10.012 mL.
To determine the actual volume of water, we can use the density formula: density = mass/volume.
Rearranging the formula to solve for volume, we get: volume = mass/density.
Plugging in the given values, we get:
volume = 9.990 g / 0.9978 g/mL = 10.012 mL.
Therefore, the actual volume measured out is slightly greater than the nominal volume of 10 mL, likely due to the meniscus formed by the water at the top of the pipet. This highlights the importance of proper measurement techniques and accounting for sources of error in experimental measurements.
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You place 35 ml of gas in a medical syringe at atmospheric pressure, 14.7 psi. What would the pressure in the syringe read if you pushed in the plunger to a volume of 2 ml? Round off to the nearest tenth,
The pressure in the syringe would read 257.3 psi if the volume is reduced to 2 ml.
What is Boyle's Law?Boyle's Law is a gas law that describes the relationship between the pressure and volume of a gas at a constant temperature. It states that the pressure and volume of a gas are inversely proportional.
How can we say that gas is an ideal gas?An ideal gas is a theoretical gas that conforms to the kinetic theory of gases. We can say that gas is ideal when it has low pressure, High temperature, and gas particles should not react with each other or the walls of the container.
We can use Boyle's Law,
P₁V₁ = P₂V₂
We can plug in the values given:
P₁ = 14.7 psi
V₁ = 35 ml
V₂ = 2 ml
Solving for P₂, we get:
P₂ = (P₁ x V₁) / V₂
P₂ = (14.7 psi x 35 ml) / 2 ml
P₂ = 257.25 psi
Therefore, the pressure in the syringe would read 257.3 psi if the volume is reduced to 2 ml.
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What is Decomposition Reaction
Answer:
Explanation:
Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.
The decomposition reaction can be represented by the general equation:
AB → A + B
Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.
There are different types of decomposition reactions, including:
Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):
CaCO3 → CaO + CO2
Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):
2H2O → 2H2 + O2
Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:
Cl2 → 2Cl
These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.
Answer:
Explanation:
reaction in which a compound breaks down into simpler substances or elements
Which of the following are behavioral adaptations? Select all that apply.
A. playing dead
B. migration
C. type of teeth
D. hibernation
E. body coverings
Answer:
The 2 types of behavioral adaptation are migration, and hibernation. Explanation: Adaptation of animal is the fitness towards its environment.
Explanation:
Which sig figs rule(s) apply in determining how many sig figs are in the number below?
Select all that apply.
92.064
5
Rule #4
Rule #2
Rule #3
Rule #1
Rule #5
Explanation:
For 92.064 the rule that is applied is all digits between two non-zero digits are significant.
For 5, the rule is all non-zero digits are significant
choose the appropriate balanced equation for the following chemical reaction. c6h6 + h2 → c6h12
The appropriately balanced equation for the given chemical reaction, where benzene (\(C_6H_6\)) reacts with hydrogen (\(H_2\)) to form cyclohexane\((C_6H_12)\), is: \(C_6H_6 + 3H_2\)→ \(C_6H_{12\)
A balanced equation is a representation of a chemical reaction that ensures the conservation of mass and charge. It shows the reactants on the left side and the products on the right side of the equation. The number of atoms of each element is equal on both sides, indicating that no atoms are gained or lost during the reaction.
To balance an equation, coefficients are placed in front of the chemical formulas to adjust the number of atoms present. These coefficients represent the relative ratios of the substances involved in the reaction. The goal is to achieve equality between the total number of atoms of each element on both sides of the equation.
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How much heat, in joules, does it take to raise the temperature of 225. 0 g of water from 25. 0°c to 100. 0°c ?.
10.5 kJ is required to convert the temperature of water.
What is Temperature?
Temperature is a unit used to describe hotness or coldness. It can be stated in terms of any number of arbitrary scales and shows the direction in which heat energy will naturally flow, i.e., from a hotter body to a colder body (one at a lower temperature). Temperature is not the same as the energy of a thermodynamic system; for instance, an iceberg has a significantly larger total heat energy than a match.
As opposed to extensive characteristics, like mass or volume, temperature is referred to as an intense property—one that is independent of the quantity of matter being considered—along with pressure, density, and other comparable properties.
q=m⋅c⋅ΔT, where
q - heat absorbed
m- the mass of the sample
c- the specific heat of the substance
ΔT - the change in temperature, defined as final temperature minus initial temperature
q=100.0g⋅4.18Jg∘C⋅(50.0−25.0)∘C
q= 10.5 kJ
10.5 kJ is required to convert the temperature of water.
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Calculate the amount of gold deposited when a current of 5A is passed through a solution of gold salt for 2hrs 15mins. If the same current is used, find the time taken for 6g of gold to be deposited. (Au=197 1faraday=96500c)
Answer:
a. 82.68 g b. 9.8 min
Explanation:
a. The amount of gold deposited by 5 A current in 2 hrs 15 mins
Since charge Q = It where I = current = 5 A and time = 2 hrs 15 mins = 2 × 60 min + 15 min = 120 + 15 min = 135 min = 135 × 60 s = 8100 s
Q = 5 A × 8100 s
= 40500 C
Also, Q = nF where n = number of moles of gold deposited and F = Faraday's constant = 96500 C
n = Q/F = 40500 C/96500 C = 0.4195 moles ≅ 0.42 mole
Now n = m/M where m = mass of gold and M = molar mass of gold = 197
m = nM
= 0.42 × 197 g
= 82.68 g
b. The time taken for 6g of gold to be deposited.
We first find the number of moles of gold in 6g of gold
Since n = m/M and m = 6 g
n = 6/197 = 0.0305 mole
Q = It = nF
t = nF/I
= 0.0305 mol × 96500 C/5 A
= 2939.09 mol C
= 587.82 s
Changing t to minutes
587.82/60 s = 9.8 min
2870 j of energy is required to heat and boil one gram of water at 20 °c. how much water at this temperature can 7.14 × 1010 j of energy heat and boil?
Answer:
Explanation:
franchement moi je te dis tu peut le faire tout seul aller bon travaille
The mass of water is equal to 2.48 × 10⁷ g, needs the energy of 7.14 ×10¹⁰ J to heat and boil.
What is the specific heat capacity?The specific heat capacity can be demonstrated as the quantity of energy needed to increase the temperature by one-degree Celcius in one unit of substance.
The temperature will be changed whenever there is a loss or absorption of energy by any substance.
Q = mCΔT
Therefore, there is a direct relationship between the mass of water and the amount of energy.
m ∝ q
\({\displaystyle {\frac{m_1}{m_2} =\frac{q_1}{q_2}\)
\({\displaystyle {m_2} =\frac{q_2}{q_1} \times m_1\)
Given, the energy required to heat mass(m₂) of water, q₂ = 7.14 ×10¹⁰ J
The energy to heat 1 gram of water, q₁ = 2870 J
\({\displaystyle {m_2} =\frac{7.14\times 10^{14}}{2870} \times 1\)
m₂ = 2.48 × 10⁷ g
Therefore, the mass of water is equal to 2.48 × 10⁷ g.
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Hypothesize in your words how the heat is flowing through radiation.
what is the role of the secondary coolant in a nuclear power plant?
The secondary coolant is converted to steam, which runs the steam turbine to generate electricity.
Secondary coolant:
creates steam to turn a turbine and generate electricityfluid is cooled by a condenser and recycleddoes not contact the reactorThe reactor coolant flows from the reactor to the steam generator. Inside of the steam generator, the hot reactor coolant flows inside of the many tubes. The secondary coolant, or feedwater, flows around the outside of the tubes, where it picks up heat from the primary coolant.
The secondary system is designed to transport heat from primary system to the atmosphere via an evaporative cooling tower. The typical system is designed to furnish 12.6 m3/min of water to the plate type heat exchanger at an inlet temperature of about 33 °C and an outlet temperature of about 42 °C.
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Which is a common way for a scientific calculator to show the number
below?
3*109
O A. 93
B. 9 * 103
C. 9E3
D. 3E9
Answer:
it can show it using the B method am i right
Could changes in polar ice far away be causing sea levels around the world to rise over time? Why or why not?
Explanation
As temperatures rise, glaciers melt faster than they accumulate new snow. As these ice sheets and glaciers melt, the water eventually runs into the ocean, causing sea level to rise. Icebergs and frozen seawater also melt in warm temperatures but are not significant contributors to sea level rise.
When glaciers collapse and pieces of glacial ice fall into the ocean, they are called icebergs. Because the water from melting glaciers is held on land, the runoff greatly raises the volume of water in the ocean, causing a rise in sea level.
The enormous ice sheets that are present in Greenland and Antarctica are also referred to as glaciers. Glaciers melt more quickly as temperatures rise than they can store new snow. As these glaciers and ice sheets melt, the water eventually enters the ocean, raising the sea level.
Changes in the amount of sea ice can impede the regular flow of the ocean, which can impact the climate globally. The polar regions are the most vulnerable regions on Earth to climate change because even a slight temperature increase can cause larger warming over time.
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a language achieves ____ by avoiding special cases in the use of constructs.
Languages may be made simple to learn, create, and maintain by eliminating specific circumstances when using constructions. Software that is quicker to build and deploy and more dependable as a result.
A language becomes simple by not using constructs in exceptional situations. This means that a programming language needs to be created in a simple and understandable manner. Code must be able to be written without taking special circumstances into account for various contexts.
This is accomplished by combining constructs that may be applied in a variety of contexts to produce sophisticated reasoning. Abstraction is the method used in this situation so that the programmer may concentrate on higher-level constructs rather than the language's lower-level specifics.
For a number of reasons, programming language simplicity is crucial. It first facilitates programmers' comprehension of the language and its structures. Writing maintainable, simple-to-read code is also made simpler by it. This is crucial for large projects where a huge number of individuals may be contributing to the codebase.
Thenumbert of flaws and errors brought into the codebase can be decreased by utilising an easy-to-understand language. As a result, the system becomes more steady and dependable. This is so that programmers may pay more attention to the logic of the code and less to the difficulties of the language.
Languages may be made simple to learn, create, and maintain by eliminating specific circumstances when using constructions. Software that is quicker to build and deploy and more dependable as a result.
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half of the estuarine area has waters falling below a certain do concentration level, and the other half has levels above that level. what is that level, in mg/l?
Half of the estuarine area has waters falling below a certain DO concentration level, and the other half has levels above that level. The level of DO concentration is 2.0 mg/L.
This is because the minimum level of dissolved oxygen in estuaries is 2.0 mg/L, below which the fish and other aquatic life will suffer from hypoxia or low oxygen levels, which may lead to fish kills and other negative impacts on the estuarine ecosystem. The division of estuarine waters into hypoxic and non-hypoxic zones at 2.0 mg/L has been a useful and widely used tool in estuarine ecology, water quality monitoring, and ecosystem management. This level is also used as a regulatory limit in many countries to protect aquatic life and to ensure the estuarine ecosystem's health and sustainability.
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In two or more complete sentences explain how to balance the chemical equation and classify it’s reaction type ___p4+___o2 ——> __p2o3
The balanced chemical equation is 2P4 + 5O2 → 2P2O3. To balance the chemical equation of P4 + O2 -> P2O3, you need to make sure that the number of atoms on both sides of the equation is equal. You can start by counting the number of atoms for each element in the reactants and products.
In this case, there are four phosphorus atoms and two oxygen atoms on the left side, and two phosphorus atoms and three oxygen atoms on the right side. To balance the equation, you need to add a coefficient of 2 in front of the product, P2O3. This will give you four phosphorus atoms and six oxygen atoms on both sides of the equation.
As for the classification of the reaction type, P4 + O2 -> P2O3 is a synthesis reaction. This is because it involves the combination of two or more reactants to form a single product. In this case, phosphorus and oxygen react to form phosphorus oxide. Synthesis reactions are characterized by the general form: A + B -> AB. Therefore, the balanced chemical equation is 2P4 + 5O2 → 2P2O3.
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2 C2H6 + 7 O2 → 4 CO2 + 6 H2O How many moles of oxygen gas (O2) are needed to create EXACTLY 6 moles of Carbon dioxide(CO2)?.
A mystery atom has 17 protons, 17 electrons, and 18 neutrons. Which element is it?
43. (a) Define the terms mixture and compound. Give three differences between them. Classify the following substances as an element, a mixture or a compound. (i) Limestone (ix)Clay (ii) Diamond (x) Urea (iii) Sand (xi) Antimony (iv) Soil (xii) Soap (v) Urine (xiii) Milk (vi) Bronze (xiv) Air (vii) Sugar (xv) Neon (viii) Gold (xvi) Iron
Mixture: A combination of two or more substances that are physically intermingled. Can be separated by physical methods.
Compound: A substance composed of two or more elements chemically bonded together. Can only be separated by chemical means.
Classification:
(i) Limestone - Mixture
(ix) Clay - Mixture
(ii) Diamond - Element
(x) Urea - Compound
(iii) Sand - Mixture
(xi) Antimony - Element
(iv) Soil - Mixture
(xii) Soap - Compound
(v) Urine - Mixture
(xiii) Milk - Mixture
(vi) Bronze - Mixture
(xiv) Air - Mixture
(vii) Sugar - Compound
(xv) Neon - Element
(viii) Gold - Element
(xvi) Iron - Element
Differences between mixtures and compounds:
Composition: Mixtures have variable compositions, meaning the ratio of substances can vary. Compounds have a fixed composition with a specific ratio of elements.
Separation: Mixtures can be separated into their components using physical methods. Compounds can only be separated into elements through chemical reactions.
Properties: Mixtures exhibit the properties of their individual components and can have varying physical properties throughout. Compounds have unique properties different from the elements they are composed of.
Classification of substances:
(i) Limestone: Mixture (contains minerals and impurities)
(ii) Diamond: Element (composed of carbon atoms)
(iii) Sand: Mixture (combination of mineral particles)
(iv) Soil: Mixture (combination of organic matter, minerals, water, and air)
(v) Urine: Mixture (contains various dissolved substances)
(vi) Bronze: Mixture (alloy of copper and tin)
(vii) Sugar: Compound (composed of carbon, hydrogen, and oxygen)
(viii) Gold: Element
(ix) Clay: Mixture (combination of minerals and organic matter)
(x) Urea: Compound (composed of carbon, hydrogen, nitrogen, and oxygen)
(xi) Antimony: Element
(xii) Soap: Compound (formed by the reaction of fatty acids with an alkali)
(xiii) Milk: Mixture (contains water, proteins, fats, sugars, and minerals)
(xiv) Air: Mixture (combination of gases like nitrogen, oxygen, carbon dioxide, etc.)
(xv) Neon: Element
(xvi) Iron: Element
It's important to note that some substances listed may have impurities or variations in composition, which can affect their classification.
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Quicklime (CaO) can be prepared by roasting
limestone (CaCO3) according to the reaction
CaCO3(s) ∆−→CaO(s) + CO2(g). When 3.3 × 103 g of CaCO3 are heated, the actual yield of CaO is 1 × 103 g. What is the percent yield?
Answer in units of %.
Explanation:
To calculate the percent yield, we need to compare the actual yield to the theoretical yield. The theoretical yield is the amount of product that would be obtained if the reaction went to completion based on the stoichiometry of the balanced equation.
First, let's determine the molar mass of CaCO3 (limestone) and CaO (quicklime):
- Molar mass of CaCO3 = 40.08 g/mol (molar mass of Ca) + 12.01 g/mol (molar mass of C) + (3 * 16.00 g/mol) (molar mass of O) = 100.09 g/mol
- Molar mass of CaO = 40.08 g/mol (molar mass of Ca) + 16.00 g/mol (molar mass of O) = 56.08 g/mol
Next, we can calculate the theoretical yield of CaO:
The molar ratio between CaCO3 and CaO is 1:1 according to the balanced equation. Therefore, the mass of CaO produced is the same as the mass of CaCO3 used.
The theoretical yield of CaO is 3.3 × 10^3 g.
Now we can calculate the percent yield:
Percent Yield = (Actual Yield / Theoretical Yield) * 100
Percent Yield = (1 × 10^3 g / 3.3 × 10^3 g) * 100
Percent Yield = 30.30%
Therefore, the percent yield of CaO in this reaction is 30.30%.
The first solution provided by meguelratatouille came close to the correct answer, but erred in assuming that equal moles implies equal mass. The following discussion corrects this mistake.
To determine the percent yield, we must compare the actual yield to the theoretical yield.
Theoretical Yield
From the balanced chemical equation we have:
CaCO3(s) --> CaO(s) + CO2(g)
It is necessary to know the molar mass of CaCO3 and CaO to determine the amount of CaO produced from a given amount of CaCO3:
Molar mass CaCO3 = 100.09 g/mol
Molar mass CaO = 56.08 g/mol
Then, to find the total mass of CaO produced by 3.3 x 10^3 g of CaCO3 reactant, we calculate:
3.3 x 10^3 g CaCO3
x 1 mol CaCO3 / (100.09 g/mol CaCO3)
x 1 mol CaO / (1 mol CaCO3)
x 56.08 g CaO / (1 mol CaO)
-----------------------------------
1848 g CaO
which we report as 1.8 x 10^3 g CaO after applying significant figures.
Actual Yield
Finally, the percent yield is given by dividing the actual yield by the theoretical yield we just computed:
(1 x 10^3 g) / (1.8 x 10^3 g) x 100% = 55.6% = 56%