Answer:
law of multiple proportion
Explanation:
# 1083 of LethalDose
Concentrated hydrochloric acid is 38%, by mass, HCI in water. How
many grams of HCI are there in 25.0 g concentrated hydrochloric acid?
Select one:
O a. 38.0 g
O b.
25.0 g
O c. 16.5 g
O d. 12.0 g
O e. 9.50 g
The amount, in grams, of HCl that are in 25.0 grams of concentrated hydrochloric acid will be 9.5 grams
Percentage contentEvery concentrated HCl contains 38% HCl by mass. This means that 38 grams of HCl would be in every 100 grams of concentrated HCl.
There, for 25.0 grams concentrated HCl, the amount of HCl can be calculated as:
38/100 x 25.0 = 9.5 grams
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Please answer this correctly!
A group of college students travel from Florida to Rome, Italy, on spring break. Which type of travel are they participating in?
A. Domestic
B. International
C. Local
D. Sustainable
Answer:
International is the answer duh
The density of methane at 0 degree Celsius and 1 atm pressure is 0.668g/L. If 1 lb is equal to 454 grams, 1 L is equal to 1000cm3 and 1 inch is equal to 2.54 cm, what is the density in pounds per cubic inch
The value of density in the required units is [tex]\rm \rho = 2.4\times 10^{-5} lb/in^{3}[/tex]
What is Density ?Density, mass of a unit volume of a material substance. The formula for density is
d = M/V
where d is density, M is mass, and V is volume.
Density is commonly expressed in units of grams per cubic centimetre.
In the given question
Density given is 0.668 g/L
1 lb = 454grams.
1L = 1000 cm³
1 inch = 2.54 cm
Density in pounds per cubic inch =
[tex]\rm \rho = 0.668 \times \dfrac{(1 \;lb)(1 grams)}{454\; grams}\times \dfrac{(1 L)(2.54)^{3}(1 cm^{3})}{1000cm^{3}(1\;L)(1 in^{3})}[/tex]
[tex]\rm \rho = 2.4\times 10^{-5} lb/in^{3}[/tex]
Therefore the value of density in the required units is [tex]\rm \rho = 2.4\times 10^{-5} lb/in^{3}[/tex].
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What is the percent composition of Cesium and Fluorine in CsF?
The percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
What is a percentage composition?Percent composition is very simple. Percent composition tells you by mass what percent of each element is present in a compound.
Molecular mass of Cs = 132.9054519
Molecular mass of F = 18.9984032
Molecular mass of CsF = 132.9054519 + 18.9984032 = 151.9038551
CsF: Percent composition by element:
Cesium (Cs) = [tex]\frac{32.9054519 X 100}{151.9038551}[/tex] = 87.493 %
Fluorine (F) = [tex]\frac{18.9984032 X 100 }{151.9038551}[/tex]= 12.507 %
Hence, the percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
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1.2 x 10-3 M in ph and is a acid or a base
Answer:
base
Explanation:
bases have a phone scale more than 7
Which best describes a difference between laser light and regular light? Laser light is less concentrated. Laser light has a beam that spreads out. Laser light is made of one specific color. Laser light pumps out light particles one at a time.
Answer:
Laser light is made of one specific color
Explanation:
Regular light is a mixture of electromagnetic waves of different wavelengths
Laser light is monochrome (one colour).
common laser colors are
red , green and violet
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Answer: C
Explanation: got it right on edge 2023
how many liters of water are needed to prepare 756 g of CaCO3 for a 3.50 M solution? MM=100.1 grams/mole
The volume of water needed to prepare the solution given the data is 2.16 L
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of CaCO₃Mass of CaCO₃ = 756 g Molar mass of CaCO₃ = 100.1 g/mol Mole of CaCO₃ =?Mole = mass / molar mass
Mole of CaCO₃ = 756 / 100.1
Mole of CaCO₃ = 7.55 moles
How to determine the volume Mole of CaCO₃ = 7.55 molesMolarity = 3.5 MVolume = ?Volume = mole / molarity
Volume = 7.55 / 3.5
Volume = 2.16 L
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Which statement is correct for the element of proton number 19?
A It is a gas that dissolves in water
B It is a hard metal that is not very reactive with water
C It is a non-metal that burns quickly
D It is a soft metal that is highly reactive with water
Answer:
D
Explanation:
From periodic table : proton number 19 corresponds to K (potassium)
which is very reactive with water
What is the nuclear composition of uranium-235?
92 electrons + 143 protons
92 protons + 143 electrons
O 143 protons + 92 neutrons
O 92 protons + 143 neutrons
♡
Answer:
The nuclear composition of uranium-235 is 92 protons and 143 neutrons.
calculate the mass of copper that could be made from 4.0g of copper oxide
The mass of copper that will be produced from copper oxide is determined as 3.19 g.
Mass of copper produced from copper oxide
The mass of copper that will be produced from copper oxide is calculated as follows;
2Cu + O₂ -----> 2CuO
2 1 2
2(63.5) ------------ 2(79.5)
x ---------------------- 4 g
x = (4 x 2 x 63.5)/(2 x 79.5)
x = 3.19 g
Thus, the mass of copper that will be produced from copper oxide is determined as 3.19 g.
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What element do all carbonate materials contain
Answer:
All carbonates contain one carbon atom bonded to three oxygen atoms. Carbonates may include other elements. A few are calcium, iron, and copper. Carbonate minerals are often found where seas once covered the land.
Which of the following, in the solid state, would be an example of a metallic crystal?
1. carbon dioxide
2. barium fluoride
3. diamond
4. iron
5. None of these
Name the following branched alkanes. Two of these are isomers of each other, put a star ★ in their boxes.
Answer:
square boxes
✪
Explanation:
if you like my answer
What is ester?
help me pleaseee
Answer:
an organic compound made by replacing the hydrogen of an acid by an alkyl or other organic group. Many naturally occurring fats and essential oils are esters of fatty acids
Explanation:
ester, any of a class of organic compounds that react with water to produce alcohols and organic or inorganic acids. Esters derived from carboxylic acids are the most common. The term ester was introduced in the first half of the 19th century by German chemist Leopold Gmelin
If the volume of an air pump used to inflate a football decreases from 480 mL to 375 mL, and the original
pressure was 93.5 kPa, what is the new air pressure in the pump if the temperature stays constant?
Answer
Explanation:
P1=93.5 kPa V1=480 mL P2=? V2=375 mL
DIRECTIONS: Solve the following problems by using G.R.E.S.A (Given, Required,Equation, Solution, and Answer).
1. At constant temperature, the volume of a gas was found to be 500cm³ at a pressure of 760mmHg. If the pressure of the gas is doubled what will be the new volume of the gas?
Answer:
SEE BELOW
Explanation:
Given 500 cm^3 = V1 760 mm = P1 (760*2) = P2
Required V2
P1V1 = P2V2
RE-ARRANGE TO P1V1/P2 = V2
(760)(500) /(760*2) = V2
V2 = 250 ML
According to Boyles law
[tex]\\ \rm\Rrightarrow P\propto \dfrac{1}{v}[/tex]
So if pressure is increased volume will be decreased and vice versaNow pressure is doubled means multiplied by 2
The volume will be divided by two of get halved .
New volume
500/2250cm³Which of the following describes how air resistance affects the motion of a falling object?(1 point) Air resistance may change the direction of a falling object but does not affect its speed. Air resistance may change the direction of a falling object but does not affect its speed. Air resistance opposes the force of gravity and causes falling objects to lose speed once they reach terminal velocity. Air resistance opposes the force of gravity and causes falling objects to lose speed once they reach terminal velocity. Air resistance opposes the force of gravity and causes an object to reach terminal velocity. Air resistance opposes the force of gravity and causes an object to reach terminal velocity. Air resistance works with gravity to pull a falling object towards the Earth. Air resistance works with gravity to pull a falling object towards the Earth.
Answer:
Air resistance opposes the gravity in a falling object hence the object loses speed once it reaches terminal velocity.
According to the experim
For the reaction
2 HCl + Na2CO3 → 2 NaCl + H2O + CO2
179.2 liters of CO2 is collected at STP. How
many moles of NaCl are also formed?
Answer:
16 mol NaCl.
Explanation:
Do the train track method to cancel out all the units except moles of NaCl on top. Remember one mole of any gas occupies 22.4 L at STP.
179.2 L CO2 x 1 mol CO2/22.4 L CO2 x 2 mol NaCl/1 mol CO2
= 16 mol NaCl
Students conducting a lab investigation are given two unknown tubes of colorless aqueous solutions. The students are told that one tube is a salt solution and the other is a sucrose solution. How can the students determine which of the solutions contains salt?
The students can determine which of the solutions contains salt through the conductive tester.
What is an ionic solution?It is a solution containing ions are atoms that have gained or lost electrons to acquire a positive (lost electron) or negative (gained electron) charge.
An ionic solution would be able to conduct electricity whereas the covalent would not so if you have a conductivity tester which is available in most labs.
The students can distinguish between the 2 solutions through the conductive tester.
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A waste treatment settling tank treats an industrial waste inflow (QIN) of 0.2 m3/s with a suspended particulate concentration (CIN) of 2000 mg/L. The settling reactor has a sludge flow (SS) to a centrifuge of 360 grams/s, and a flow (QS) of 0.050 m3/s. The centrifuge has a return flow (QR) to the settling tank of 0.048 m3/s and a concentration (CR) of 408 mg/L.
1. What is the effluent flow (QE, in m3/s), concentration (CE, in mg/L) and particulate mass flow (SE, in grams/s)
2. What is the concentration (CDW) and particulate mass flow rate (SDW) for the dewatered sludge?
The effluent flow in concentration and particulate mass flow will be 0.198m³/sec.
How to calculate the effluent flow?It should be noted that the total inflow will be equal to the total outflow. Therefore,
0.2 + 0.048 = 0.05 + We
Collect like terms
Qe = 0.2 + 0.048 - 0.05
Qe = 0.198m³/sec
The concentration will be:
= (360 × 1000)/0.05
= 7200mg/L.
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Chem help!! I know the answer is 8 but why?
Answer:
Explanation:
It's simple train track method of cancelling out units.
If we read the balanced equation as this: 2 dm3 of octane reacts to form 16 dm3 of CO2 then how much CO2 is produced by 1 dm3?
Would you agree that it would be half of 16?
[tex]\frac{2dm3}{16 CO2} = \frac{1dm3}{?CO2}[/tex]
Cross multiply and solve for ?, you get 8.
1. Once tissue fluid enters the lymphatic capillaries, it is called what?
Lymph
Ducts
Organs
Nodes
elenium dichloride, SeCl2, has a molar mass of 149.86 g/mol. What is the mass in grams of 0.195 moles of SeCl2? Use the common abbreviation for the units.
Selenium chloride has a molar mass of 149.86 g/mol. The mass of selenium dichloride in grams is 29.22 grams.
What is mass?
Mass is the quantity of matter of a physical body.
The molar mass is given 149.86 g/mol
The number of moles is 0.195
By the formula of molar mass
[tex]\rm Molar\;mass = \dfrac{mass}{number\;of\;moles} \\\\\rm mass = molar mass \times number\;of\;moles\\\rm mass =149.86 \times 0.195 = 29.22 g[/tex]
Thus, the mass of selenium dichloride in grams is 29.22 grams.
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a sample of sulfur dioxide occupies a volume of 652 mL at 40.0 C and 0.75 atm. What volume will the sulfur dioxide occupy at STP?
The volume that sulfur dioxide will occupy with a volume of 652 mL at 40.0°C and 0.75 atm is 0.019moles. Details about volume can be found below.
How to calculate volume?The volume of a gas can be calculated using the following formula:
PV = nRT
P = pressureV = volumen = number of molesR = gas law constantT = temperature0.75 × 0.652 = n × 0.0821 × 313
0.489 = 25.69n
n = 0.489/25.69
n = 0.019moles
Therefore, the volume that sulfur dioxide will occupy with a volume of 652 mL at 40.0°C and 0.75 atm is 0.019moles.
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Task
Determining Heat Gain and Loss
In this activity, you’ll heat an object in hot water and then transfer it to cool water. The object will become cooler, and the cool water will become warmer. Based on the temperature changes, you’ll calculate and compare the heat lost by the object and the heat gained by the water. To begin, choose an object (or objects) made of a known material and that can be immersed in water without causing damage.
Before you begin this task, read these lab safety guidelines. If you’re using an electronic balance, watch this video about measuring mass.
Estimated time to complete: 1 hour
If you’re using an Edmentum lab kit, remove the electronic balance and thermometer from the kit. These materials are italicized in the following equipment list. Then gather any additional items shown in the list. If you’re not using an Edmentum lab kit, alternatives are suggested in parentheses. If you don't have these alternative materials at home, please check with your teacher for help.
You’ll need these materials:
electronic balance (may also use a kitchen scale, readable at least to the nearest gram)
thermometer, readable at least to the nearest degree from 0°C to 100°C (32°F to 212°F)—readings to the nearest tenth of a degree will produce better results
foam cups (2)
lids to fit the cups (may use squares of cardboard as lids)
solid object (or group of objects) of a known material that can fit easily in the cup, ideally having a total mass of 25 to 60 grams; here are some ideas:
2–5 plastic dominoes, depending on size
5–10 glass marbles, depending on size
10 quarters
tongs
pen or marker
stove, hot plate, or microwave oven
container for heating water (depends on the selected heat source)
Part A
Begin the task by performing these steps. Record your observations in the table provided.
Label the foam cups with the numbers 1 and 2.
Record the type (and quantity, if applicable) of object you will be using. Include what kind of material the object is made of.
Determine the specific heat capacity of the chosen object from this list of specific heat capacities. If you can’t locate your material on the list, do an online search.
Use the electronic balance to measure the mass of the chosen object(s). Record the mass. Then, place the object(s) into cup 1.
Answer:
The water warms to a temperature of 28.1°C. Determine the specific heat capacity of the zinc. Now this 229.9 J is equal to the -Qmetal. The specific heat capacity of the metal can be calculated by setting -229.9 J equal to m•C•ΔT.
...
Heat and Changes of State.
Explanation:
will favor dissolution and
will favor crystallization in a saturated solution of table sugar.
a. cooling, heating
b. heating, cooling
C. evaporation, heating
d. cooling, evaporation
Answer:
b) heating, cooling
Explanation:
Heating will favour dissolution (it helps dissolving faster).
Cooling helps in crystallization.
Net ionic equation for Calcium hydroxide reacting with ammonium Chloride?
Answer:
Ca(OH)₂ (aq) + 2NH₄Cl (aq) → CaCl₂ (aq) + 2NH₃ (g) + 2H₂O (l)
Ca²⁺ + 2OH⁻ + 2NH₄⁺ + 2Cl⁻ → Ca⁺² + 2Cl⁻ + 2NH₃ (g) + 2H₂O (l)
2OH⁻ + 2NH₄⁺ → 2NH₃ (g) + 2H₂O (l)
Explanation:
ca (OH)2 + 2NH4CL------> CACL2 + 2NH3 + 2H2O
A system is a group of parts that can be considered one unit. Storm systems, ecosystems, and our bodies are natural systems. Cars and houses are human-made systems. Choose an example of a system, and analyze the energy flow through the system. Describe in detail how energy enters the system, how energy changes form while in the system, and how energy leaves the system.
An ecosystem is simply a collection of communities of plants, animals, and microbes interacting together and with their physical environments.
Energy flow in an ecosystemEnergy enters the ecosystem through a group of living organisms known as the producers. the producers are mainly the green plants that are capable of photosynthesizing.
Photosynthesis converts solar radiation from the sun to chemical energy in green plants. Another group of organisms in the ecosystem, the primary consumers, feed directly on the producers and as such, are able to gain some energy from them.
The secondary consumers obtain their own energy by feeding on primary consumers. Tertiary consumers feed on the secondary consumers for their own energy and the food chain goes on and on.
Only about 10% of the available energy in one trophic level goes to the next trophic level. The rest of the energy is lost as heat to the surroundings. Thus, the producers have the highest energy in the ecosystem while organisms at the top of the food chain have the lowest energy.
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I need help with this i need help by sb
Answer:
30N to the left.
Explanation:
There is no net vertical force as the 45N force upwards and the 45N force downwards cancel each other out.
Horizontally, the resultant force is the 30N to the left as the 45N force to the left is in opposite direction to the 15N force to the right, so they are subtracted:
45N - 15N = 30N
Hope this helps!
1. How many moles are in 78.9g of HCI?