Answer:
1.3 M
Explanation:
The formula mass of lithium fluoride is 7+19=26 g/mol. This means that in 52 grams of LiF, there is 2 moles.
Molarity = (moles of solute)/(liters of solution), so the answer is 2/1.5 = 1.3 M
1
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The frequency of a wave is the number of waves that pass through a fixed point per second. When the wavelength of the wave decreases, this value increases.
What are waves?A wave is actually a disturbance that travels or promulgates from its point of origin.
Waves transfer energy from one part to another, but not necessarily mass. Light, sound, and ocean waves are all examples of waves.
The frequency of a wave is the number of waves that pass through a fixed point per second. When the wavelength of the wave decreases, this value increases.
Thus, the answers are frequency and wavelength respectively.
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How do you assume the help position to reduce heat loss in cold water?.
Crossing your arms across the chest and pulling the knees up to your chest is how the HELP position is achieved.
What is HELP position?This is referred to as heat escape lessening position and reduces heat loss in individuals when in cold water.
This position helps to protect groin, head/neck, and rib cage/armpits areas of the body.
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Describe the properties of alkaline earth metals. Based on their electronic arrangement, explain whether they can exist alone in nature.
The properties of alkaline earth metals include
highly metallic and good conductors of electricity.What are alkaline earth metals?Alkaline earth metals are the metals that occupies the group two in the periodic table. They include the following:
beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).The properties include the following:
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Answer:
Alkaline metals have valency 2, they have 2 valence electrons, their oxides are basic in nature, and they are electropositive. Alkaline metals are not found in nature alone.
Explanation:
20 ml of a mixture of C2H6 and C3H8 gases in X : Y mole ratio, is burnt completely by which 52 ml CO2 gas is evolved. If 20 ml of a mixture of CH4 and C4H10 gases in Y : X mole ratio is burnt completely then what is the volume (in ml) of CO2 gas evolved?
A) 40 B) 44 C) 50 D) 55
The volume of CO2 prodiced when 12 mL of CH4 and 8 mL of C4H10 is burnt is 56 mL.
What is the equation of the reaction?The equation of the combustion of C2H6, CH4, C4H10, and C3H8 gases are given below:
2 C2H6 + 7 O2 ---> 4 CO2 + 6 H20
C3H8 + 5 O2 ---> 3 CO2 + 4 H20
CH4 + 2 O2 ----> CO2 + 2 H2O
2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O
X moles of C2H6 will produce 2X moles of CO2
Y moles of C3H8 will produce 3Y moles of CO2
Thus;
X + Y = 20 mL
X =20 - Y ---(1)
2X + 3Y = 52 mL ---(2)
Solving for X by substituting in (2)
2 (20 - Y) + 3Y = 52
40 - 2Y + 3Y = 52
Y = 12 mL
Then X = 8 mL
Volume of CO2 produced when 12 mL of CH4 and 8 mL of C4H10 is burnt = (12 × 2 + 8 × 4) = 56 mL
Therefore, the volume of CO2 produced is 56 mL.
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Determine the unknown mineral using the information given below. Be sure to use significant figure rules when doing calculations. Mass is shown on the triple beam. Scale Test Mineral Mineral H. Density, g/cc 10 diamond tellurium 2 2.07 9 corundum galena 2.5 7.58 8 topaz anglesite 2.5 - 3 6.4 7 quartz chalcocite 2.5 - 3 5.6 6 feldspar copper 2.5 - 3 9.0 5 apatite gold 2.5 - 3 19.3 4 fluorite silver 2.5 - 3 10.5 3 calcite arsenic 3.5 5.7 2 gypsum barite 3 - 3.5 4.4 1 talc dolomite 3.5 - 4 2.9 platinum 4.5 21.5 willemite 5.5 4.0 magnetite 6 5.18 pyrite 6 - 6.5 5.02 pyrolusite 6 - 6.5 5.0 cassiterite 6.5 6.9 diamond 10 3.52 Volume of water displaced = 0.051 L
Mass: 981.0, 908, 908.1, 981 g
Density: 192.35, 19,235, 19, 19.2 g/cc
Hardness 4, 2.5, 1, 3, 5.5 - 5, 3, 2, 4.5, 1.5
Determine the unknown mineral.
Platinum, Gold
The unknown mineral is gold because of the similar properties of gold to that unknown mineral.
What is unknown mineral?The unknown mineral is Gold because it has similar properties to the gold. Gold has density of 19.3 grams per cubic centimeter which is same to this unknown mineral. The hardness and mass of the mineral are also similar to the Gold.
So we can conclude that the unknown mineral is gold because of the similar properties of gold to that unknown mineral.
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Part A: Dalton’s Atomic Model
Question 1
Using what you can recall from this unit, write one or two short paragraphs describing John Dalton’s atomic model. If needed, search the Internet for descriptions of the model.
John Dalton’s atomic model described atoms as the smallest indivisible part of an element.
What are atomic models?Atomic models are models which are used to represent the structure of the atom.
Different scientists put forward different models to represent the atom.
One of the scientists was John Dalton.
The features of Dalton's atomic model includes:
atoms are the smallest particle of elements atoms are indivisible atoms of the same element were the same and atoms if different elements differed in all aspectsTherefore, John Dalton’s atomic model described atoms as the smallest indivisible part of an element.
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What is the volume of a sample of mercury, a liquid metal, if it has a density of 14 g/ml and a mass of 28 g?
Exposure to even small amounts of radiation may cause
Select the correct answer from each drop-down menu. a reaction proceeds with 2.72 moles of magnesium chlorate and 3.14 moles of sodium hydroxide. this is the equation of the reaction: mg(clo3)2 2naoh → mg(oh)2 2naclo3. determine the theoretical amount of each product that the reaction will produce. the reaction will produce of magnesium hydroxide and of sodium chlorate.
334.22 grams of sodium chlorate and 91.56 grams of magnesium hydroxide would be produced respectively.
Stoichiometric calculationFrom the equation of the reaction:
[tex]Mg(ClO_3)_2 + 2NaOH --- > 2NaClO_3 + Mg(OH)_2[/tex]
The mole ratio of magnesium chlorate to sodium hydroxide is 1:2.
With 2.72 moles of magnesium chlorate and 3.14 moles of sodium hydroxide provided respectively, the sodium hydroxide is limiting in availability.
Mole ratio of NaOH and [tex]NaClO_3[/tex] = 1:1
equivalent mole of [tex]NaClO_3[/tex] = 3.14 moles
Mass of 3.14 moles [tex]NaClO_3[/tex] = 3.14 x 106.44 = 334.22 grams
Mole ratio of NaOH and [tex]Mg(OH)_2[/tex] = 2:1
Equivalent mole of [tex]Mg(OH)_2[/tex] = 3.14/2 = 1.57 moles
Mass of 1.57 moles [tex]Mg(OH)_2[/tex] = 1.57 x 58.32 = 91.56 grams
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“Kids and grown-ups love it so, the happy world of HARIBO!” Who does not like the dark brown liquorice and its lovely taste?! Tasty above all is the liquorice-plant. As another ingredient “ammonium chloratum” very often is used as an acidifier. This name is apothecary’s jargon and the old chemical name of ammonium chloride (NH4Cl).
Ammonium chloride, also known as “salt of salmiak”, is allowed up to 20 g/kg in liquorice by the nutrition laws.
Ammonium chloride can be produced from ammonia (NH3) and hydrogen chloride (HCl). You are a student trainee with HARIBO’s. Suddenly the machine in which the ammonia and the hydrogen chloride are combined and added to the liquorice sounds the alarm, but your boss is in his office on an urgent telephone call and does not want to be interrupted. The valves controlling the doses of ammonia and hydrogen chloride have to be adjusted. You have to act quickly. It is very important not to overdose the ammonium chloride, because its amount in the liquorice is controlled regularly by an independent supervision agency.
The machine produces ammonium chloride for a thousand bags of 200 g liquorice each.
Answer:
Any Questions?
So i can give you the answer
It was experimentally determined from three trials that an object had a density of 0.96, 0.99, and 0.95 g/mL. What is the average density and standard deviation of this object
The mean of the sample is 0.97 while the standard deviation of the sample is 0.015.
What is the average density?The average density is the sum of the density values divided by the total number of measurements.
In this case, we have three trials, the mean of the samples is [tex]0.96 + 0.99 +0.95/3 = 0.97[/tex]
The standard deviation is obtained from;
s= [tex]\sqrt{(0.96 - 0.97)^2 + (0.99 - 0.97)^2 + (0.95 - 0.97)^2/(3 - 1)}[/tex]
s = [tex]\sqrt{(0.0001) + (0.0004) + (0.0004)/2}[/tex]
s = 0.015
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compare molecular & covalent network crystal solid?
Answer:
Molecular solids and covalent network solids are two types of solid compounds. The key difference between molecular solid and covalent network solid is that molecular solid forms due to the action of Van der Waal forces where as covalent network solid forms due to the action of covalent chemical bonds.
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A 1600 watts electric oven is used for 9 hours. Calculate the Cost of using the #3.00 per unit of of energy (Energy consu- med = power x time). What are the functions of the ammeter and Voltmeter ? Solution ( (A
The cost of using 14,400 watts hour would be $43.2.
What is Energy ?Energy is defined as the capacity to do work.
It is given in the question that
A 1600 watts electric oven is used for 9 hours
Power * Time
power = 1600 watts
Time = 9 hours
Total energy consumed = 1600 watts * 9 hours
= 14,400 watts hour
energy is measured in Kilowatts hour
= 14,440 watts hour
14,440/1000 kwh
= 14.4 kwh
It is given that the cost per unit of energy is $3.00 per kwh
Therefore , the cost of using 14,400 watts hour would be 14.4 * 3
= $43.2
The function of Voltmeter and Ammeter is to measure Voltage and Current respectively.
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Determine the charge for each of the following. Please help
Which causes winds to blow over the surface of earth
Answer:
the uneven heating of the Earth by the sun and the Earth's own rotation. Winds range from light breezes to natural hazards such as hurricanes and tornadoes.
Given the following generic chemical reaction , which is the reactant ?
Answer:
X
Explanation:
X is the reactant and Y is the product
Write BE if the statement is Beneficial Effect to the sun’s heat and light, HE if it is Harmful Effect of the sun’s heat and light and SP to avoid the negative effects of too much exposure to sunlight.
___1. UV rays can help treat some health conditions. It creates Vitamin D.
___2. Use sunblock lotion with SPF 15 during hot days.
___3. With the presence of sunlight, farmers can dry their crops.
___4. UV rays can damage the tissue in your eyes.
___5. Research says that sunlight helps moods.
___6. Too much exposure from the sun can cause skin cancer.
___7. Use sunglasses when you stay under the sun.
___8. Wear a wide- brimmed hat on sunny days.
___9. Humans can do recreational activities on a sunny day.
___10. Wear sunglasses that filter UV light.
___11. Prolonged exposure to the sun’s heat makes your skin age faster than normal.
___12. Too much heat from the sun can cause heat stroke and loss of water.
___13. Sunlight helps strengthen your immune system.
___14. The vitamin D made thanks to the sun plays a big role in bone health.
___15. Avoid sun in the middle of the day, from about 10 a.m. to 3 p.m.
Based on exposure time and place, the Sun's radiation may have harmful or beneficial effects.
What is solar radiation?Solar radiation refers to the radiation from the Sun in the form heat, light and other forms of radiation.
The radiation from the Sun may have harmful or beneficial effects.
The effects of the Sun's radiation can be classified as BE, HE or SP as follows:
BE- UV rays can help treat some health conditions. It creates Vitamin DSP- Use sunblock lotion with SPF 15 during hot days.BE- With the presence of sunlight, farmers can dry their crops.HE- UV rays can damage the tissue in your eyes.BE- Research says that sunlight helps moods.HE- Too much exposure from the sun can cause skin cancer.SP- Use sunglasses when you stay under the sun.SP- Wear a wide- brimmed hat on sunny days.BE- Humans can do recreational activities on a sunny day.SP- Wear sunglasses that filter UV light.HE- Prolonged exposure to the sun’s heat makes your skin age faster than normal.HE- Too much heat from the sun can cause heat stroke and loss of water.BE- Sunlight helps strengthen your immune system.BE- The vitamin D made thanks to the sun plays a big role in bone health.SP- Avoid sun in the middle of the day, from about 10 a.m. to 3 p.m.Learn more about Sun's radiation at: https://brainly.com/question/921530
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Balance the following chemical reaction :p(s) + cl2(g) = pcl5(s)
Answer:
[tex]2\text{P}+ 5\text{Cl}_2 \rightarrow 2\text{PCl}_5[/tex]
Explanation:
Answer:
2P (s) + 5PCl₂ (g) → 2PCl₅ (s)
Explanation:
There are 2 chlorine atoms on the reactant side and 5 chlorine atoms on the product side.
Hence, multiply the left chlorine molecule by 5 and right compound by 2.
⇒ P (s) + 5 × Cl₂ (g) → 2 × PCl₅
⇒ P (s) + 5Cl₂ (g) → 2PCl₅ (s)
But, now we see that there is 1 phosphorus atom on the reactant side and 2 phosphorus atoms on the right.
So, multiply the left phosphorus atom by 2 to balance.
⇒ 2 × P (s) + 5PCl₂ (g) → 2PCl₅ (s)
⇒ 2P (s) + 5PCl₂ (g) → 2PCl₅ (s)
Boxes on trees in swamps give wood ducks a place to build their nests platforms built on top of telephone poles provide a place for eagles to make their nests
in backyards and parks, people may set up houses for bats, birds, or toads how do these artificial homes affect resources in the animal's environments? how
does this in turn affect population size?
These artificial homes preserve the resources in the animal's environment and increases population size.
What is Population size?This is defined as the number of organisms in a population at a given place and time.
Since the resources used are artificial, they are preserved with an increase in the population due to reproduction.
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How many moles of CO2 can be formed from 10 g of CH4?
Answer:
0.625 moles of CO2
Explanation:
Remark
The equation used (I take it) is a hydrocarbon burning. If it is not, leave a note on the question. The method I will use is
Find the moles CH4Use the equation to adjust the number of moles of the product. It the balance numbers are the same, move on.Equation
CH4 + 2O2 ====> CO2 + 2H2O
Givens
10 grams CH4
Solution
Number of moles of CH4
mol CH4 = given mass / molar mass.
given mass = 10 grams
molar mass CH4
C = 12H = 4 * 1 4molar mass 16Moles of CH4
mol = given mass / molar mass
mol = 10 grams / 16 grams
mol = 0.625
Answer
Since the number of moles of CO2 and CH4 are the same in the balanced equation. the answer is 0.625 mols of both.
How many esters with the molecular formula C₂H₁O₂ can be made by reacting a primary alcohol with a carboxylic acid? A 4 B 5 C6 D 8
Answer:
your answer is c- 6 esters
Predict: suppose you began with 8 moles of no2 in the chamber. what do you think will happen if you let the reaction go for a long time?
The protraction of this reaction would over time lead to attainment of equilibrium and appearance of N2O4.
What is equilibrium?The term equilibrium refers to the point where the forward and the reverse reactions proceed at the same rate.
Hence, the reaction will reach equilibrium if the reaction continues for a long time, then some N2O4 molecules will begin to appear in the system.
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An element in Group 6A (16), period 3 would have which of the following properties?
An element in group 6A, period 3 with an atomic number of 16 would be brittle in nature.
BrittlenessBrittleness is the characteristic of a substance to break easily when hit with an object or against an object.
The element with the atomic number 16 is sulfur. Sulfur does not conduct heat nor electricity and neither can it be turned into wire.
Sulfur exists naturally as a brittle solid that is yellow in appearance.
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Is decay pool or flux
Answer:
A single carbon pool can often have several fluxes both adding and removing carbon simultaneously. For example, the atmosphere has inflows from decomposition (CO2 released by the breakdown of organic matter), forest fires and fossil fuel combustion and outflows from plant growth and uptake by the oceans.
Explanation:
how do electrostatic forces affect the electrons in an atom?
Answer:
allows the atoms of different elements to bond together to form new substances
The negatively charged electrons are held together by electrostatic force by the positively charged atomic nucleus.
What is electrostatic forces?Electrostatic forces are non-contact forces that pull or push on objects without contacting them.
The positively charged atomic nucleus holds the negatively charged electrons together with electrostatic force.
Thus, in this way electrostatic forces affect the electrons in an atom.
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The reaction of an acid and a base will always produce what kind of salt?
A.
a combination of the cation from the acid and the anion from the base
B.
a combination of the cation from a strong base and the anion from a weak acid
C.
neutral salts from the cation of a strong base and the anion from a weak acid
D.
basic salts from the cation of a strong base and a strong acid
E.
depends on the strength of the acid and the base
Answer:
the answer of the question is c
Predict the final temperature of 3.50 kg of water in a calorimeter if the water is at 27.5°C before 0.77 oz of noodles containing 81.0 kcal are burned
The final temperature of the water is determined as 50.55 ⁰C.
Final temperature of the waterThe final temperature of the water is determined from the following calculations;
Q = mcΔθ
Δθ = Q/mc
where;
Q is the amount of energy = 81 kcal = 338904 Jc is specific heat capacity of water = 4,200 J/kgCΔθ = 338904 /(3.5 x 4200)
Δθ = 23.05 °C
Final temperature = T₁ + Δθ
Final temperature = 27.5°C + 23.05 °C = 50.55 ⁰C.
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What errors did the chemistry teacher make in planning to this demonstration and how could checking her work have made a difference?
*THERE ARE A TOTAL OF 4 ERRORS* NEED HELP ASAP BEFORE 11:59 PM
With the hope of sharing an explosive combustion reaction demonstration in class
for her students, a chemistry teacher decides to synthesize water. This process
occurs when oxygen gas (O₂) in the air is combined with hydrogen gas, H₂, in the
presence of a spark or small flame. Like the reactants, the water (H₂O) product is
also a gas.
She knew she didn't want the demonstration to create too much water product,
only 180.0 grams.
Since the oxygen reactant is abundantly present in the air, she needed only to
determine how much hydrogen gas to prepare before class.
She used the following chemical equation to make her predictions:
O2(g) + H2(g) → H₂O(g)
The teacher used have used standard temperature and pressure values in her calculations of volume of hydrogen gas required.
What is the equation for the synthesis of water?The equation for the synthesis of water is given below as follows:
[tex]2 H_2 + O_2 \rightarrow 2H_2O[/tex]
Based on the planned steps of the synthesis of hydrogen gas by the teacher, the following errors were committed by the teacher:
She used temperature in degrees Celsius for her calculations She used the mass of water required instead of moles of water in her calculation using the ideal gas equation She did not use standard temperature and pressure measurement in her calculations She used an unbalanced chemical equation for her calculationTherefore, in calculation molar volume of gases, the measurements should be taken at standard temperature and pressure values.
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A client who weighs 70 kg is receiving a solution of 0.9% sodium chloride (normal saline) 500 ml with dopamine 800 mg at 5 ml/hour. how many mcg/kg/minute is the client receiving
The mcg/kg/minute the client is receiving is 1.904 mcg/kg/min whose weight is 70 kg.
What does mcg kg mean?1 milligram (mg) = 1000 micrograms (mcg) or 0.001 grams (g) 1 g = 1000 mg 1 kilogram (kg) = 1000 g 1 kg = 2.2 pound (lb) 1 liter (L) = 1000 milliliters (mL)
The number of mcg/kg/minute = flow rate × concentration ÷ mass of client
Flow rate = 12 ml/hour = 12 ml/hour × 1 hr/60 min = 0.2 ml/min
Concentration = mass of dopamine/volume
where
mass of dopamine = 800 mg and
volume = 500 ml
Concentration =800 mg/500 ml
= 1.6 mg/ml
= 1.6 mg/ml × 1000 mcg/mg
= 1600 mcg/ml
mass of client = 70 kg
Calculating mcg/kg/minute
So, substituting the variables into the equation, we have
mcg/kg/minute = flow rate × concentration ÷ mass of client
mcg/kg/minute = 0.08 ml/min × 1600 mcg/ml ÷ 70 kg
mcg/kg/minute = 320 mcg/min ÷ 70 kg
mcg/kg/minute = 1.904 mcg/kg/min
Thus, the mcg/kg/minute the client is receiving is 1.904 mcg/kg/min
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Even when it is cold outside, the human body maintains an internal temperature of 37C. Which term describes the maintenance of a stable internal condition?
A. mitosis
B. homeostasis
C. endocytosis
D. photosynthesis