Answer:
7
Explanation:
Answer:
Bromine has 7 valence electrons.
Explanation:
Bromine is in group 7 or 17, so it has 7 valence electrons use the Lewis structure for more help.
The picture above shows the water cycle. In the water cycle, water travels from the land to the sky and back again. Water leaves the ocean through _______ and returns to the ocean through _______.
A.
evaporation; precipitation and run-off
B.
condensation; evaporation
C.
transpiration; precipitation and run-off
D.
run-off; condensation
The picture above shows the water cycle. In the water cycle, water travels from the land to the sky and back again. Water leaves the ocean through Evaporation and returns to the ocean through Precipitation and run-off.
Thank You ☺️ ☺️.
☆ ★ Make It Brainlist Answer Please.....Answer:
A
Explanation:
Brainiest
Remember do it today start now don’t wait
A material was cooled from 100°C to 40°C. What is the temperature change?
A -40°C
B 60°C
C 40°C
D -60°C
Answer:
D
Explanation:
Which of the following statements is true about cellular respiration?
It converts energy into food.
It breaks down food to release energy.
It turns carbon dioxide into water.
It turns water into carbon dioxide.
Answer:
it breaks down food to release energy
Answer: I believe the answer is B) It breaks down food to release energy!!!!
Which activity will NOT cause an increase in reaction rate?
catalyst
inhibitor
surface area
temperature
Answer:
Inhibitor
Explanation:
Inhibitors generally slow down a reaction rate and prevent the particles from reacting with each other.
It's not the others because:
Catalysts work by lowering the activation energy, which in turn increases the reaction rate as more particles have enough energy to react.
Surface area allows for particles in the reaction to collide more often with each other, which increases the reaction rate.
Temperature increases the speed of particles in the reaction, causing particles to collide more often with each other and therefore increasing the reaction rate.
Inhibitor activity will not cause an increase in reaction rate.
What is rate of reaction?Rate of reaction is defined as the speed at which the chemical reaction takes place defined as the proportional to the increase in concentration of the product per unit time and decrease in concentration of the reactant per unit time.
Rate of reaction is the part of chemical kinetics.
Inhibitors are defined as a substance that decreases the rate of chemical reaction or it may stop the chemical reaction.
Thus, Inhibitor activity will not cause an increase in reaction rate.
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What is the molar mass for Iron(I) Phosphate?
Hey there!
I think you meant to put iron (II) phosphate, because iron (I) phosphate isn't a thing.
So the formula for iron (II) phosphate is Fe₃(PO₄)₂.
Molar mass:
Fe: 3 x 55.845 = 167.535
P: 2 x 30.97 = 61.94
O: 8 x 16 = 128
-------------------------------------
357.475 grams/mole
The molar mass of iron(II) phosphate is 357.475 g/mol.
Hope this helps!
The molar mass for Iron(II) Phosphate is 176.124 g/mol, found by summing the molar masses of iron and phosphate. This calculation involves considering the atomic masses multiplied by the number of atoms in the compound.
The molar mass for Iron(II) Phosphate is computed to be 176.124 g/mol. To determine this, you start by finding the individual molar masses of iron and phosphate and then adding them up according to the compound's formula.
For Iron(II) Phosphate, you'd have 3 iron atoms with a total molar mass of 167.8 g/mol and 2 phosphate ions with a total molar mass of 8.324 g/mol, giving a total molar mass of 176.124 g/mol.
(10 points) What is the empirical formula for a compound that is 54.48% carbon, 13.75% hydrogen, and 31.77 % nitrogen?
The Empirical formula will be for given compound that is 54.48% carbon, 13.75% hydrogen, and 31.77 % nitrogen is [tex]C_2H_6N[/tex] .
Explanation:
The formula which gives the simple whole number ratio of the atoms of various elements present in one molecule of the compound is understood as empirical formula. This can be more appropriately understood by solving the given problem as follows:
The % of elements given as:
C = 54.48%
H = 13.75%
N = 31.77%
The atomic mass of elements given as:
C = 12 g
H = 1 g
N = 14 g
Calculating number of moles as :
[tex]N = \frac{Mass}{Molecular-Mass}[/tex]
[tex]C = \frac{54.48}{12} = 4.54[/tex]
[tex]H= \frac{13.75}{1} = 13.75[/tex]
[tex]N = \frac{31.77}{14} = 2.26[/tex]
Now, we will divide the least number of moles from number of moles of C, H and N respectively, we will round off the values to an integer value:
For C: [tex]\frac{4.54}{2.26} = 2[/tex]
For H: [tex]\frac{13.75}{2.26} = 6[/tex]
For N: [tex]\frac{2.26}{2.26} = 1[/tex]
Hence, C, H and N are in the ratio of 2:6:1, so empirical formula will be for given compound that is 54.48% carbon, 13.75% hydrogen and 31.77 % nitrogen is [tex]C_2H_6N[/tex].
Final answer:
The empirical formula of a compound with a composition of 54.48% carbon, 13.75% hydrogen, and 31.77% nitrogen is C₂H₆N.
Explanation:
To find the empirical formula of a compound with a percent composition of 54.48% carbon, 13.75% hydrogen, and 31.77% nitrogen, follow these steps:
Assume you have 100 grams of the compound, which translates directly to percentages. Therefore, you have 54.48 grams of carbon, 13.75 grams of hydrogen, and 31.77 grams of nitrogen.Convert these masses to moles by dividing by the atomic mass of each element (carbon: 12.01 g/mol, hydrogen: 1.008 g/mol, nitrogen: 14.01 g/mol).Calculate the mole ratio by dividing each element's mole count by the smallest number of moles calculated in step 2.If necessary, multiply these ratios by an integer to get whole numbers for each element. This gives you the empirical formula.For this compound:
Carbon: 54.48 g ÷ 12.01 g/mol = 4.54 molesHydrogen: 13.75 g ÷ 1.008 g/mol = 13.64 molesNitrogen: 31.77 g ÷ 14.01 g/mol = 2.27 molesDivide each by the smallest number of moles, which is for nitrogen (2.27 moles):
C: 4.54 moles ÷ 2.27 moles = 2H: 13.64 moles ÷ 2.27 moles = 6N: 2.27 moles ÷ 2.27 moles = 1The smallest whole number ratio is 2:6:1, which simplifies to 1:3:0.5. Since we need whole numbers, we multiply by 2 to get the empirical formula: C₂H₆N.
Explain the process of root wedging.
Answer:
Root Wedging is the process in which roots grow into the cracks in rocks and force the cracks open as they continue to grow.
Explanation:
A 32 g sample of LiCl is dissolved in water to for 655 mL of solution. What is the molarity of the solution?
1.1 x 10-3 M LICI
1.1 M LICI
4.9 x 10-2 M LICI
49 M LICI
Answer : The molarity of the solution is, 1.1 M LiCl
Explanation : Given,
Mass of [tex]LiCl[/tex] = 32 g
Volume of solution = 655 mL
Molar mass of [tex]LiCl[/tex] = 42.4 g/mole
Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.
Formula used :
[tex]\text{Molarity}=\frac{\text{Mass of }LiCl\times 1000}{\text{Molar mass of }LiCl\times \text{Volume of solution (in mL)}}[/tex]
Now put all the given values in this formula, we get:
[tex]\text{Molarity}=\frac{32g\times 1000}{42.4g/mole\times 655mL}=1.1mole/L=1.1M[/tex]
Therefore, the molarity of the solution is, 1.1 M LiCl
The molarity of the LiCl solution is 1.15 M.
Explanation:To calculate the molarity of the solution, we first need to convert the mass of LiCl to moles using the molar mass of LiCl. The molar mass of LiCl is 6.94 g/mol + 35.45 g/mol = 42.39 g/mol. Therefore, the number of moles of LiCl is:
32 g ÷ 42.39 g/mol = 0.755 mol
Next, we divide the number of moles by the volume of the solution in liters to calculate the molarity:
0.755 mol ÷ 0.655 L = 1.15 M LiCl
The government is exploring many new green technologies in order to produce energy. One example is the wind turbine. As the wind passes by, the blades move which turns a generator and produces energy. What energy transformation is taking place in the wind turbine?
Answer:
The mechanical energy of the wind is converted into electrical energy by a wind turbine. The kinetic energy of a flowing fluid, in this example air, is converted into a rotating motion by a turbine. Wind moves or rotates the blades of a wind turbine as it passes through them.
Explanation:
Wind turbines work on a simple principle: rather than using electricity to create wind (like a fan does), they utilize wind to create electricity. The propeller-like blades of a turbine are turned by the wind around a rotor, which spins a generator, which generates power.
Wind is a type of solar energy that is produced by a series of three events: The sun heats the atmosphere unevenly, irregularities on the surface of the world, or the earth's axis of rotation.
Wind patterns and speeds range dramatically across the United States, and are influenced by bodies of water, vegetation, and topography changes. Sailing, flying a kite, and even generating electricity are all examples of how humans employ wind flow, or motion energy.
Both "wind energy" and "wind power" refer to the process of using the wind to generate mechanical or electrical power. This mechanical energy can be employed for specialized purposes (such as grinding grain or pumping water), or it can be converted to electricity using a generator.
The aerodynamic force of the rotor blades, which act similarly to an airplane wing or helicopter rotor blade, converts wind energy into electricity in a wind turbine. The air pressure on one side of the blade lowers when the wind blows across it. Lift and drag are created by the difference in air pressure across the two sides of the blade. The lift force is greater than the drag force, causing the rotor to spin. The rotor is connected to the generator either directly (if it's a direct drive turbine) or through a shaft and a series of gears (a gearbox), which speeds up the rotation and allows the generator to be physically smaller. This conversion of aerodynamic force to generator rotation to create electricity.
Caclulate the pH of a solution with a hydrogen ion concentration of 1X10-7
Answer:
The pH of the solution is 7.00 .
Explanation:
The pH gives us an idea of the acidity or basicity of a solution. More precisely, it indicates the concentration of H30 + ions present in said solution. The pH scale ranges from 0 to 14: from 0 to 7 corresponds to acid solutions, 7 neutral solutions and between 7 and 14 basic solutions. It is calculated as:
pH = -log (H30 +)
pH= -log (1x10^-7)
pH= 7.00
Glucose is a simple sugar. What other plant foods and chemicals are made from glucose?
bread, rice, pasta, potatoes, vegetables, fruit, sugar, yogurt, milk, fish, meat, cheese, peanut butter, butter, salad dressing, avocado, and olive oil.
Answer:
Protein, fat, vitamins and oil.
Explanation:
Hope this helps :)
carrying capacity is the maximum population that a given area can support.
am I right???
There will be change in the population of a species everyday. The carrying capacity is the maximum population that a given area can support. Thus the given statement is right.
What is carrying capacity?The carrying capacity is defined as the maximum population, density or biomass that a specific area can support sustainably. This likely changes over time and also depends on many environmental factors, presence of predators, etc.
It is the carrying capacity which denotes the point where the population cannot grow further theoretically and it is not growing any larger. It can be increased by supplying greater amount of food, decreasing predation, raising the amount of habitat, etc.
It can be decreased by increasing predation, decreasing the amount of habitat, etc. A constant K is used to represent the carrying capacity. It is due to this the population is found to be in a stable state.
Thus carrying capacity is the maximum population that a given area can sustain.
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Is it really possible for humans not to alter the natural world around them?
Answer: I'm sure it's possible but we too lazy
Explanation:
Why does the solution turn from yellow to blue?
Answer:
Bromothymol blue (BMB) is an indicator dye that turns yellow in the presence of acid. When carbon dioxide is added to the solution, it creates carbonic acid, lowering the pH of the solution. BMB is blue when the pH is greater than 7.6, green when the pH is between 6-7.6, and yellow when the pH is less than 6.
How does an Arrhenius acid change when it
dissolves in water?
Answer:
Explanation:
when dissolved in water, dissociates into ions, including hydrogen ions. According to Arrhenius, an acid can be defined as a material that increases the concentration of hydrogen ions in water.
Arrhenius acid is that acid when dissolve in water, dissociate into ions and give hydrogen ions H+.
What is an Arrhenius acid?An Arrhenius acid is a molecule that donates an H+ in solution when dissolved in water. To put it simply, a proton donor.
The key to identifying an Arrhenius acid is to look for a molecule that begins with the letter H and contains an oxygen or halogen.
Thus, the Arrhenius acid is that acid when dissolve in water, dissociate into ions and give hydrogen ions H+.
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Is lithium oxide an acidic oxide or basic oxide? Give reasons for your answer.
Answer:
Based on their acid-base characteristics oxides are classified as acidic, basic, amphoteric or neutral: An oxide that combines with water to give an acid is termed as an acidic oxide. The oxide that gives a base in water is known as a basic oxide.
Explanation:
Answer:
your answer
Explanation:
The oxide that gives a base in water is known as a basic oxide. An amphoteric solution is a substance that can chemically react as either acid or base. However, it is also possible for an oxide to be neither acidic nor basic, but is a neutral oxide.
What happens when a hydrocarbon combusts?
O
A. It reacts with oxygen to produce carbon dioxide, water, and heat.
B. It reacts with carbon dioxide to produce oxygen, water, and heat.
O
c. It breaks apart when heated to form solid carbon and hydrogen
gas.
O
D. It breaks apart when heated, forming gases from its individual
atoms.
The combustion of hydrocarbon results in its reaction with oxygen thereby producing carbon dioxide, water and heat. Thus, option A is correct.
What is combustion?Combustion can be given as the chemical reaction that results with the burning in the presence of oxygen, thereby resulting the oxides and the release of energy.
The hydrocarbon are the compounds with the presence of hydrogen and carbon. Thereby the combustion results in the formation of oxides of hydrogen and carbon that is water and carbon dioxide along with heat. Thus, option A is correct.
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During which of the following processes does a glucose molecule break down into ethanol?
Aerobic respiration
Alcoholic fermentation
Lactic acid fermentation
Photosynthesis
A glucose molecule breaks down into ethanol during the process of alcoholic fermentation, which is an anaerobic pathway alternative to aerobic respiration.
During the process of alcoholic fermentation, a glucose molecule is broken down into ethanol. This anaerobic process follows the initial step of glycolysis, where one glucose molecule is converted into two pyruvate molecules. This is followed by the conversion of pyruvate into acetaldehyde and carbon dioxide, after which the acetaldehyde is further reduced into ethanol.
This reduction step regenerates NAD⁺ from NADH, which is essential for glycolysis to continue and for the overall fermentation to proceed.
Fermentation processes like alcoholic fermentation and lactic acid fermentation are alternative pathways to aerobic respiration, differing by their end products--ethanol and carbon dioxide in the former, and lactic acid in the latter. Whereas aerobic respiration is a different process entirely in which glucose breaks down into carbon dioxide and water using oxygen, yielding a much higher amount of ATP compared to fermentation.
The correct answer to the student's question is, therefore, alcoholic fermentation, where glucose is broken down into ethanol in the absence of oxygen.
Does anhydrous salt contain any water?
Answer: No
Explanation:
For which characteristic was this Chinese shar-pei MOST LIKELY selectively bred?
A. fat mass
B. wrinkled skin
C. lean muscle mass
D. frequent skin infections
Answer:
B
Explanation:
because every Chinese shar-pei has wrinkled skin.
Which factors describe a Mediterranean climate? Check all that apply.
has very few trees
is found in inland areas
has cool and rainy winters
has little to no precipitation
has dense shrubs and grasses
Answer:
Has very few trees, has cold and rainy winters, and has dense shrubs and grasses.
Balance the following chemical reactions:
1. Pb(NO₃)₂ → PbO + NO₂ + O₂
2. CH₄ + O₂ → CO₂ + H₂O
3. Cu + AgNO₃ → Cu(NO₃)₂ + Ag
4. MnO₂ + HCl → MnCl₂ + H₂O + Cl₂
5. Pb(NO₃)₂ + NaCl → PbCl₂ + NaNO₃
Write the chemical reaction and balance it.
1. A solution of potassium chloride when mixed with silver nitrate solution, an insoluble
white substance is formed.
2. Copper sulphate on treatment with potassium iodide precipitates cuprous iodide(Cu₂l₂),
liberates iodine gas and also forms potassium sulphate.
1. 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂
2. CH₄ + 2O₂ → CO₂ + 2H₂O
3. Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag
4. MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂
5. Pb(NO₃)₂ + 2NaCl → PbCl₂ + 2NaNO₃
1)
[tex]NaCl+AgNO_3=>NaNO_3+AgC\downarrow[/tex]
2)
CuSO_4+Cu_2Cl_2\neq>
[tex]CuSO_4+Cu_2l_2\neq[/tex]
Why does the earth not receive energy equally
The earth doesn't receive the same energy equally because of its shape. The earth is a sphere, the energy in the equatorial regions are more than the polar regions.
What are the different components that make up a chemical formula?
A chemical formula is made up of chemical symbols of the elements involved, subscripts representing the number of those atoms in the compound, and the simplest whole number ratio of these atoms. Isomeric forms of compounds have the same molecular formula but different structures and properties.
Explanation:A chemical formula represents the composition of a compound made up of two or more elements chemically combined. Three main components make up a chemical formula:
The chemical symbols of the elements: These are one-, two-, or three-letter abbreviations for the elements. For example, the hydrogen symbol is H, and the oxygen symbol is O.Subscripts: These represent the exact number of atoms of that element present in the compound. For example, in H2O, the subscript '2' indicates that there are two hydrogen atoms.The ratio of atoms: An empirical formula gives the simplest, whole-number ratio of atoms in a compound. This could be the same as the molecular formula (as in H2O), or it might be different. For example, the molecular formula of glucose is C6H12O6, but this simplifies to CH2O in its empirical formula.Some molecules may also exist in isomeric forms, which are compounds with the same molecular formula but different arrangements of atoms, which results in different chemical properties. For example, ethanol (C2H6O) and dimethyl ether (C2H6O) have the same molecular formula but their structures and properties are different because of different bonding arrangements.
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How many moles of nitric acid are needed to make 2 liters of a solution of nitric acid in water with a molarity of 1?
Answer: 0.5 moles
Explanation:
Nitric acid has a chemical formula of HNO3.
Given that:
Amount of moles of HNO3 = Z (let unknown value be Z)
Volume of HNO3 solution = 2L
Molarity of HCl solution = 1M
Recall that molarity of a solution is obtained by dividing the amount of moles by volume in liters
i.e Molarity = Amount in moles/volume
1M = Z x 2L
Z = (1M / 2L)
Z = 0.5 moles
Thus, 0.5 moles of nitric acid are needed to make 2 liters of its solution.
How does the value of compare with the concentrations of hydronium ion and hydroxide ion?
Answer:
A. Ka X Kb = [H3O+][OH-]
Answer:
A. Ka x Kb = [H3O+] [OH-]
Explanation:
[H+] = 1.0 x 10-5 M
What’s the ion concentration ?
Answer:
pH = +5
Explanation:
pH = - log [H+]
pH = - log (1×10^-5)
pH = 5.
A student needed to make 100.0 mL of 0.20M NaOH solution. How many grams of sodium hydroxide does the student need to weigh out
Answer:
0.8 g
Explanation:
The molarity of a solution is calculated with the following formula:
[tex]M=\frac{n}{V}[/tex]
where:
n is the number of moles of the solute
V is the volume of the solution
In this problem we have:
V = 100.0 mL = 0.1 L is the volume of the solution
M = 0.20 is the molarity
So the number of moles of NaOH in the solution must be
[tex]n=MV=(0.20)(0.1)=0.02 mol[/tex]
The molar mass of NaOH is
[tex]M_m = 40 g/mol[/tex]
Therefore, the mass of NaOH needed in the solution is:
[tex]m=nM_m = (0.02)(40)=0.8 g[/tex]
Final answer:
To make 100.0 mL of a 0.20M NaOH solution, the student needs to weigh out 0.800 grams of sodium hydroxide, using the molar mass of NaOH (40.0 g/mol) and the volume of the solution in liters (0.100 L).
Explanation:
The subject of this question is how many grams of sodium hydroxide (NaOH) are needed to prepare a 100.0 mL of 0.20M NaOH solution. To determine the mass required, we use the molarity equation M = moles/L and rearrange it to find the number of moles of NaOH needed, which is Moles = Molarity × Volume (in liters).
First, convert the volume from mL to L:
100.0 mL × (1 L / 1000 mL) = 0.100 L.
Now, calculate the number of moles required for the solution:
0.20 M × 0.100 L = 0.020 mol NaOH.
With the number of moles and the molar mass of NaOH, which is 40.0 g/mol, we can find the mass needed:
0.020 mol NaOH × 40.0 g/mol = 0.800 g of NaOH.
Therefore, the student needs to weigh out 0.800 grams of sodium hydroxide to make their solution.
A small research submarine with a volume of 1.2 x 105 L has an internal pressure of 1.0 atm and an internal temperature of 150 C. If the submarine descends to a depth where the pressure is 150 atm and the temperature is 30 C, what will the volume of the gas inside be if the hull of the submarine breaks?
Answer:
V₂ = 570 L
Explanation:
Given data:
Initial volume = 1.2 ×10⁵ L
Initial pressure = 1 atm
Initial temperature = 150 °C (150 +273 = 423 K)
Final temperature = 30°C (30+273 = 303 K)
Final volume = ?
Final pressure = 150 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 1.0 atm × 1.2 ×10⁵ L × 303 K / 423 K × 150 atm
V₂ = 363.6×10⁵ L atm .L. K / 63450 K.atm
V₂ = 0.0057×10⁵ L
V₂ = 570 L
One major problem with wind and solar energy is that they are conditional. Explain how hydroelectric pumped storage could be used to eliminate this obstacle?
Answer:
These pumps allow the energy to be saved for later use, whenever the load increases.
Explanation:
These hydroelectric pumps are a vast connection of ancillary grid services. These act as storage plants. These enable an electric provider to balance energy and provide stability. This network not only has reservoirs but also controls the frequency of the energy produced.
Due to this, within a few seconds, large amounts of electricity can be produced.
Hydroelectric Pump is a set of two water reserves which pump water through turbines to generate energy at various required elevations. The produced energy is stored by various electric power systems.