Answer:
Who was the first president of United States?
A Benjamin Franklin
B George Washington
C Abraham Lincoln
D John Adams
Answer:
High points please help *NO TROLL ANSWERS*
kayla wants to find the width, AB, of a river. she walks along the edge of the river 150 ft and marks point c. then she walks 32 ft further and marks point D. she turns 90° and walks until her location, point A, and point C are collinear. she marks point E at this location, as show.
Why does a gas smell diffuse faster than a colour in a liquid?
Answer:
because there are other particles to help it move around in the air
3. Indicators are usually organic molecules with functional groups that will accept or donate
protons to the solution which will change the structure and make the solution change color. How
does the accuracy and precision of a pH measurement done with an indicator compare to that of
pH paper or a pH probe?
What determines how much something will change temperature?
Answer:
The heat Q transferred to cause a temperature change depends on the magnitude of the temperature change, the mass of the system, and the substance and phase involved. (a) The amount of heat transferred is directly proportional to the temperature change.
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Write 1/5 as an equivalent fraction with 500 in the denominator?
I need help please
Answer:
100 / 500
Explanation:
100 / 500 is equivalent to 1 / 5.
Describe how the flow of water changes the temperature at the beach ?
Answer: Ocean currents act as conveyer belts of warm and cold water, sending heat toward the polar regions and helping tropical areas cool off
Explanation: Hope this helps? Brainliest if it helped
How many hydrogen atoms are there in 2.25 moles of H2CO3?
Answer:
4.5moles
Explanation:
2.25moles times 2 hydrogen atoms per one molecule
The number of hydrogen atoms present in 2.25 moles of hydrogen carbonate is 4.5.
What is a mole?
A mole of a compound is equivalent to the one formula unit of the compound. The number of atoms of each element in a mole of the compound can be given from the formula unit.
1 unit of hydrogen carbonate consists of 2 atoms of hydrogen. Thus, 1 mole of hydrogen carbonate has 2 hydrogen atoms.
The number of hydrogen atoms in 2.25 mole of hydrogen carbonate can be given as:
[tex]\rm 1\;mol\;H_2CO_3=2\;atoms\;Hydrogen\\2.25\;mol\;H_2CO_3=2.25\;\times\;2\;atoms\;of\;hydrogen\\2.25\;mol\;H_2CO_3=4.5\;atoms \;of\;Hydrogen[/tex]
The number of hydrogen atoms present in 2.25 moles of hydrogen carbonate is 4.5.
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Davy made a model of the water cycle by adding some water inside a plastic bag, sealing the bag, and placing it in a sunny area. He noticed that the level of the water went down, and then some droplets appeared on the sides of the bag. Which part of the water cycle caused water droplets to form on the side of the plastic bag?
Condensation
Evaporation
Precipitation
Runoff
Answer:
precipitation
Explanation:
what happens inside a can of solid food as gas is produced
Answer:
Bacteria or mold grows in the can giving of the gasses and producing byproducts that may be harmful or dangerous to ingest (eat).
Explanation:
A balloon containing 0.040 mol of a gas with a volume of 5.0 mL was expanded to 1.0 L.
Which equation should you use to find the amount of gas added?
Answer:
B) n2=V2N1/V1
the second part is 0.080
Explanation:
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The volume and number of moles of a gas are in direct proportion. Hence, as the volume increases from 5 ml to 1 L, number of moles increases from 0.040 to 8 moles.
What is Avogadro's law?Avogadro's law, states that, at constant pressure and temperature, the number of moles of a gas is directly proportional to the volume of the gas. Hence,
V1/n1 = V2/n2, for two different volumes.
Given that, v1 = 5 ml
v2 = 1 L = 1000 ml
n1 = 0.040 mol
then n2 = v2 n1/ v2
Number of moles at 1 L = (0.040 mol × 1000 ml)/5 ml = 8 moles.
Hence, the number of moles of the gas added = 8 - 0.040 = 7.96 moles.
Therefore, the amount of gas added at the increased volume is 7.96 moles.
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How many moles of hydrogen would be required to produce 5 mol of water?
Answer:From this you can see that 5 moles of hydrogen gas would react with 2.5 of the available 3 moles of oxygen gas, to form 5 moles of water.
Explanation:
1. You have 4.0 g of NaCl. Calculate the number of moles of
NaCl
Answer:
0.07mol
Explanation:
n=mass/molar mass
molar mass of NaCl=23+35.558.5g/moln=4/58.50.07molHow much H is need to react with 6.58 g of O, in this reaction?
H2 + O2 -> H2O
Answer:
Balance the equation first
[tex]2H_{2} \ + \ O_{2} \ --> \ 2H_{2}O[/tex]
6.58g of Oxygen gas
Divide 6.58g by molar mass of oxygen (32g/mol)
6.58/32 = 0.205625 mol
Use mol to mol ratio from looking at the coefficients of the reactants, the mol ratio of Hydrogen gas to Oxygen gas is 2:1, so for every 1 mol of Oxygen, you need 2 times the mol of hydrogen for it to make water.
0.205625 * 2 = 0.41125 mol
To get the mass of hydrogen gas needed in the reaction, turn 0.41125 mol into mass by multiplying it with Hydrogen gas's molar mass, which is 2.02 g/mol.
0.41125 * 2.02 ≈ 0.83g of H2
How do you separate and collect salt and water after a neutralisation reaction?
Answer:
First filter the the un-soluble solute out of the solution
Then get the solute and put it on an evaporating dish to form salt crystals
Explanation:
A WATER WAY CONTAINS 10.3 MILIGRAMS OF IMPURITY PER GALLON OF WATER.HOW MANY MICROGRAMS OF IMPURITY ARE PRESENT PER LITER OF WATER.
1 MG= 1000 MICROGRAMS
1 GAL=3.79 LITERS
I Gallon = 3.785 L 1 Mg = 1 mg gallon 3.785L. 3. The recommended adult dose of Elixophyllin®, a drug used to treat asthma, is 6.00 mg/kg of body mass. Calculate the dose in milligrams for a 112 lb person. (o oo Kg | K9 6.oong 112 15 = 3 04.7 - 3 2.20515 2.20516 my k.
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How would an asthma attack most likely affect oxygen delivery in the body?
Answer: During an asthma attack, you aren't getting enough oxygen into your lungs. This means less oxygen is getting into your blood and into your muscles. Without oxygen, fatigue sets in.
which safety symbol would you expect to see on a can of insect repellant?
Answer:
Pesticides. They are labelled to help identify their toxicity.
How do I Determine the number of moles in 3.51 x 1023 formula units of CaCl2.
Answer:
I used a picture
Explanation:
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How many atoms of magnesium metal are needed to produce 3.87 moles of magnesium oxide
(Mgo)?
2Mg(s) + O2(g) —> 2MgO (s)
What was the mass of the Mg that the students began with?
Answer:
48.42g of Mg
Explanation:
Answer:
they other guys is ri gh gt
I wonder what avocado is made of
Answer:
The avocado consists of around 73% water, 15% fat, 8.5% carbohydrates — mostly fibers — and 2% protein. Half an avocado, at around 100 grams (g) contains 160 calories ( 1 ).
Combustion of an unknown compound containing only carbon and hydrogen produces 12.3 g of CO₂ and 3.8 g of H₂O. What is the empirical formula of the compound?
Answer:
C2H3
Explanation:
.
The empirical formula of the compound is C3H3.
What is an empirical formula?
In science, the exact equation of a synthetic compound is the most straightforward entire number proportion of particles present in a compound. A basic illustration of this idea is that the experimental recipe of sulfur monoxide, or somewhere in the vicinity, would just be Thus, similar to the observational recipe of di sulfur dioxide, S2O2.
In this manner, sulfur monoxide and di sulfur dioxide, the two mixtures of sulfur and oxygen, have a similar exact equation. Nonetheless, their sub-atomic equations, which express the quantity of iotas in every particle of a synthetic compound, are not something similar.
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The model here shows a process by which a hydra, an aquatic organism, produces a new offspring that is a clone of the original organism. If a student is explaining how the organism creates its own clone, which process would be included in the explanation? A) mitosis B) meiosis C) fertilization D) binary fission
The reproduction of hydra is through budding process from its body. This process of regeneration is called mitosis.Mitosis is a type of cell division process. Thus option A is correct.
What is mitosis?Mitosis is a cell division process in which one cell produces two identical daughter cells. The term mitosis means the duplication of the genetic material chromosomes with the exact gene information.
Different stages in mitosis together is called mitotic phases. Hydra is an invertebrate freshwater organism. Hydra has a translucent tubular body which can be elongated and contracted.
Hydra is classified to the phylum hydrozoa. It have a regeneratable head. The reproduction of hydra is through budding. A small bud first projects from its tubular body which then develops and emerges out by cell division.
The divided daughter hydra will grow as a matured hydra. This overall budding process takes places through mitosis. Hence, option A is correct.
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g A student performs an experiment where gas is collected over water in an upside down graduated cylinder. If the atmospheric pressure is 739 mmHg and the level of water in the graduated cylinder is 11 cm higher than the level of the water exposed to the atmosphere, what is the total pressure of gases inside the graduated cylinder
The total pressure of gases is equivalent to 739mmH divided by the area.
How to calculate the total pressure of gases?To calculate the total pressure of gases, the next formula can be used:
Total pressure: Force/areaTotal pressure 739 mmH/areaHow to calculate the area?The area of a cylinder is equal to 2πrh+2πr².
You can know the radio by checking the measurement of the base of the graduated cylinder. Also, you can determine the height by observing how many mm the gas is occupying. Then follow these steps:
Find out the area based on the formula provided.Replace the area in the pressure formula.Solve the formula.Note: This question is incomplete because the height occupied by the gas and the radio of the cylinder are not provided. Due to this, I answered this question based on general knowledge.
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Determine the molar mass of (show your work) :
FeCl3•6H2O (note, this is all 1 molecule. Its an FeCl3 with a cage of 6H2O’s attached. These molecules are known as hydrates.)
Ca3(PO4)2
What does it mean that something is a conservative ion?
Answer:
The major ionic constituents whose concentrations can be determined from the salinity are known as conservative substances. Their constant relative concentrations are due to the large amounts of these species in the oceans in comparison t
Please help I’m marking the brianliest answer please
G. A gas is at currently at STP. What volume will the
gas have at 100°C and 5.0 atm?
Answer:
[tex]less \: than \: 10 \: litres \: [/tex]
Explanation:
At 100℃,P=1atm
V=10L
At NTP, T=20
P=1atm
PV=nRT
PV=nRTV∝C
So at NTP temp is less than 100℃ and as the volume is proportional to temperature.
So at NTP temp is less than 100℃ and as the volume is proportional to temperature.Thus, the volume will be less than 10L as the temperature decreases.
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In this system, ___________________ energy from the cyclist is converted to a lot of ___________________ energy and a little bit of ___________________ energy. The ___________________ energy from the turning bicycle wheel spins the turbine which generates ___________________ energy. The fluorescent light bulb converts this energy into two new forms: a lot of ___________________ energy and very little ___________________ energy.
Switch out the fluorescent bulb (curly one) with the incandescent bulb (rounded) and observe the energy output.
Energy can be converted from one form to another.
What is energy transformation?The question is incomplete as the system is not shown but I will try to help you the much I can. First of all, this question deals with the idea of energy transformation. We must note that energy is neither created nor destroyed but can be transformed from one form to another.
The system ought to have been composed of many systems in which energy transformations occur ad each of these must obey the law stated above. These energy transformation are not 100% efficient as some energy is lost as heat along the way
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Calculate the number of moles of KOH in 6.70 mL of a 0.480 M KOH solution. (Enter your answer in scientific notation.)
Answer:
3.2×10^-3 mol
Explanation:
The equation for molarity is M= n/L. Where "M" is Molarity, "n" is the number of moles of solute, and "L" is the total liters in solution.
The question gives you the volume in mL, so to convert "mL" to "L" you need to divide by 1000. (6.70mL/ 1000L)= 0.0067L.
Now you can plug the numbers into the equation. 0.480M= n/ 0.0067L), multiply (0.480M×0.0067L)= 0.003216 mol. The scientific notation is 3.2×10^-3, 10^-3 because you move the decimal back three times and 3.2 because there are 2 sig figs.
In one or two sentences, explain why the combined weight of several liquids mixed in an open flask can be less than but never more than the sum of all the weights of the ingredients.
Answer:
The combined weights of several liquids mixed in an open flask be less than the sum of all the weights of the liquids because when the reaction occurs new products are formed and also some gases which releases in the atmosphere.
Which location in the image below represents the OLDEST rocks?
A and C are the only two places that would represent the oldest rocks