In pasteur’s experiment, what would have happened if pasteur had broken off the swan neck of the flask one week after boiling the nutrient broth to sterilize the flask?.
Cells from the air would have fallen into the sterilized growth medium in the flask and grown there if Pasteur had broken off the swan neck of the flask one week after boiling the nutrient broth to sterilize the flask.
Who was Pasteur?He was referred to as a microbiologist who was responsible for many advances in science through experiments and an example is the one which was done using broth.
He heated the flask after it was sealed to kill microbes present in it and the result was nothing grew in the sample. However, if he had broken off the swan neck of the flask one week after boiling, cells from the air would have fallen into the sterilized growth medium in the flask and grown there.
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Element X has a half life of 6 days. If you start with 50 kg of element X,
how much would be left after 24 days?
After 24 days, you will have 1/2 kg
It's a common occurrence for radioactive isotopes to spontaneously decay over time, shedding their radioactive atoms. The period of time it takes for any sample of an element to be reduced to half its initial amount is known as the half-life of a radioactive isotope. The differential equation
dNdt=kN(t)
describes the decay of such radioactive isotopes, where N(t) is the number of radioactive atoms of the element that are still present at time t and k is the decay constant.
The solution to the aforementioned differential equation is N(t) = N (0)ekt, where N (0) is the initial sample's initial number of atoms.
Keep in mind that the natural logarithm has the identity
a ln n=a ln n.
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A group of Grade 12 students were asked to perform an experiment on the reaction between calcium carbonate and hydrochloric acid as shown in the set up. The volume of carbon dioxide (CO₂) gas was collected using a glass syringe and the observation was recorded in the table below. Conical-> flask hydrochloric acid calcium carbonate Stop watch syringe retort stand An experiment set up to measure the volume of carbon dioxide gas released from the reaction between calcium carbonate and hydrochloric acid.About this, find out how much volume of carbon dioxide is produced in the first minute?
volume of carbon dioxide is produced in the first minute 0.56 L of CO₂
Salt, carbon dioxide, and water are produced when metal carbonate and an acid react. In order to create calcium chloride (CaCl2), carbon dioxide (CO2), and water, calcium carbonate (CaCO3) combines with hydrochloric acid (HCl) (H2O). We are aware that 22.4 L is the volume occupied by 1 mole of any gas at 0° C and 1 atm pressure.
Thus, 100 g of CaCO₃ produces 22.4 L of CO₂
So, 2.5 g CaCO₃ will form, which equals 100.
56 L of CO (2.5*22.4/100)
= 0.56 L of CO₂
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A substance is held in an open container. Its particles move past one another at random speeds but do not leave the container.
https://cdn.app.edmentum.com/EdAssets/a63bfe4a27294d5eb1faaf145376dad4?ts=635018086749300000
Heat is removed from the system, and the particles slow down. When enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. When this happens, the substance enters its solid state.
A substance is held in an open container its particles move fast one another at random speeds but do not leave the container then When enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them
When more gas particles enter a container, there is less space for the particles to spread out, and they become compressed and the particles exert more force on the interior volume of the container and this force is called pressure and in gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container with an increase in temperature, the particles gain kinetic energy and move faster and that's why in the open container particles moves fast one another and when enough heat is removed then the particles no longer have enough speed to overcome the weak attractive forces between them
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a handbook lists the density of lead as 11.3 g/ml. several groups of students are attempting to determine the density of a lead weight by various methods. calculate the average density measured by each group, and the percentage error in each average.
The average density measured by each group, and the percentage error in each average is 0.88 % , 1.18 % , - 1.77% .
Equation :Group 1 :
= d (trial 1 +2+3) / 3
= 12.7 + 11.32 + 10.3 / 3
= 11.4 g/ml
% error = [(E.V - T.V) / T.V ] x 100
= [( 11.4 - 11.3 ) /11.3 ] x 100
= 0.88 %
Group 2 :
d = A.J + 11.4 + 11.4/3
= 11.43 g/ml
% error = 11.433 - 11.3 / 11.3 x 100
= 1.18 %
Group 3 :
d = 10.9 + 11.3 + 11.1 / 3
= 11.10 g/ml
% error = 11.10 - 11.3 / 11.3 x 100
= - 1.77%
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I understand the question you are looking for :
handbook lists the density of lead as 11.3 gmL, Several groups of students are attempting to determine the density of a lead weight by various methods. Calculate the average density measured by each group. and the percentage error in each average. Measured densities (g/mL) Group [ Group 2 Group 3 Trial 12.7 113 10.9 Trial 2 11.2 114 11.3 Trial 3 10.3 114 11.1 average density of group 1: glmL percent error of group average density of group 2: glmL percent error of group 2: average density of group 3: glmL percent error of group 3: Which group was most accurate? Which group was most precise? group group 2 group group 3 group 3 group
Using the periodic table above and your knowledge of patterns and trends on the table, which of the following elements is the most reactive? (1 pt)
*
1 point
Titanium (Ti, #22)
Silicon (Si, #14)
Oxygen (O, #8)
Argon (Ar, #18)
How do I do this gas phase equilibrium problem?
The equilibrium constant is the ratio of the reactants to the products which is 2.
What is equilibrium constant?The equilibrium constant shows the extent to which the reactants are converted into products. The equation of this reaction could be written from the number of molecules of the reactants.
Let the reactants be A and B and the product C, the reaction equation thus becomes;
The equilibrium constant is the ratio of the reactants to the products which is 2.
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How many seconds are in 32 years with dimensional analysis
Answer:
There are 1.0 * 10^9 seconds in 32 years.
Explanation:
To solve this problem, we will use dimensional analysis, or multiplying by fractions equivalent to 1.
We are starting with a value in years. Since we know that there are 365 days in 1 year, we can multiply the given value (in years) by 365 days/1 year to cancel out the units of years and convert to days:
32 years * 365 days/1 year = 11,680 days
Next, we can use the same idea to convert from days to hours:
11,680 days * 24 hours/1 day = 280,320 hours
And then again for hours to minutes and minutes to seconds:
280,320 hours * 60 minutes/1 hour * 60 seconds/1 minute
= 1009152000 seconds
This answer is quite large, so we will convert to scientific notation to make the value more manageable.
1009152000 seconds = 1.0 * 10^9 seconds
Therefore your answer is 1.0 * 10^9 seconds.
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which procedure cannot be performed on a hot plate, requiring a bunsen burner instead? select one: heating a crucible to remove water from a hydrate heating a solvent to help the solute dissolve heating water to boiling for a water bath heating an isolated solid to dry it
The procedure that cannot be performed on a hot plate, requiring a bunsen burner instead include A. Heating a crucible to remove water from a hydrate.
How to illustrate the information?The procedure that can be performed on a hot plate are:
a. Heating a solvent to help a solute dissolve.
b. Heating an isolated solid to dry it.
c. Heating water to boiling for a water bath.
It should be emphasized that heating a crucible in order to extract water from a hydrate cannot be done using a hot plate. Anyone should avoid heating any ceramic or silica items on a hot plate.
The ideal solution is to heat a crucible to extract the water from a hydrate.
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10. After removing 68.1 kilograms of old copper tubing from air conditioning units Mark takes his load to a recycling
yard. There he is paid $2.50 per pound. How much money did he make?
The amount made from removing 68.1 kilograms of old copper tubing is $375.34.
Amount made from removing 68.1 kilograms of old copper tubing
The amount made from removing 68.1 kilograms of old copper tubing is calculated as follows;
A = mass x cost per mass
mass = 68.1 kg = 150.1348 lb
Amount = $2.5/lb x 150.1348 lb
Amount = $375.34
Thus, the amount made from removing 68.1 kilograms of old copper tubing is $375.34.
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What is made of only one type of atom?
Answer:
element
Explanation:
its the only substance type of antom called the element so yeah
an automobile gasoline tank holds 21.0 gal21.0 gal when full. how many pounds of gasoline will it hold if the gasoline has a density of 0.737 g/ml0.737 g/ml ?
129 pounds of gasoline will it hold if the gasoline has a density of 0.737 g/ml.
What is Stoichiometry ?Stoichiometry helps us use the balanced chemical equation to measures quantitative relationships and it is to calculate the amount of products and reactants that are given in a reaction.
What is Density ?Density is defined as mass per unit volume. S.I unit if density is kg/m³.
It is expressed as
Density = [tex]\frac{\text{Mass}}{\text{Volume}}[/tex] or [tex]d = \frac{m}{V}[/tex]
Now,
= [tex]21.0\ \text{gallon} \times \frac{3.785\ L}{1\text{gallon}} \times \frac{1000\ mL}{1\ L} \times \frac{0.737\ g}{1\ mL} \times \frac{1\ kg}{1000\ g} \times \frac{2.2046\ \text{pounds}}{1\ kg}[/tex]
= [tex]\frac{21.0 \times 3.785 \times 1000 \times 0.737 \times 2.2046}{1 \times 1 \times 1000 \times 1}\ \text{pounds}[/tex]
= 129 pounds.
Thus from the above conclusion we can say that 129 pounds of gasoline will it hold if the gasoline has a density of 0.737 g/ml.
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How did Dalton atomic theory make the other Atomic theories possible? What essential information did his theory provide
John Dalton was born in a poor weaver's family in 1766 in England. He began his career as a teacher at the age of twelve. Seven years later he became a school principal. In 1793, Dalton left for Manchester to teach mathematics, physics and chemistry in a college. He spent most of his life there teaching and researching. In 1808, he presented his atomic theory which was a turning point in the study of matter.
Dalton's Atomic Theory:According to Dalton's Atomic theory, all matter whether an element, a compound or a mixture is composed of small particles called atoms.
The postulates of this theory may be stated as follows:
All matter is made of very tiny particles called atoms, which participate in chemical reactions.Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.Atoms of a given element are identical in mass and chemical properties.Atoms of different elements have different masses and chemical properties.Atoms combine in the ratio of small whole numbers to form compounds.The relative number and kinds of atoms are constant in a given compound.How can the strength of a force affect velocity?
When the force become stronger, the acceleration becomes larger and the velocity changes by a wider margin.
What is the force?We know that the force is that which makes motion to occur. In other words, an object would continue in its state of rest or uniform motion unless it is acted upon by an external force.
We know that the stronger the force the greater the acceleration since force is directly proportional to the acceleration of a body. Given this statement, it is important to also know that acceleration is the change of velocity with time.
When the force become stronger, the acceleration becomes larger and the velocity changes by a wider margin.
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What do plant cells make in the process of photosynthesis?
If the pk values for phosphoric acid are 2. 15, 6. 82 and 12. 38, at what ph would one observe equal amounts of h2po4- and hpo42-?
Answer: https://homework.study.com/explanation/if-the-pk-a-values-for-phosphoric-acid-are-2-15-6-82-and-12-38-at-what-ph-would-one-observe-equal-amounts-of-h-2-po-4-and-hpo-4-2.html
Explanation:
website to the answer lol
how much water should be added to 28 ml of 15% alcohol solution to reduce the concentration to 14%?
The amount of water that should be added to 28 ml of 15% alcohol solution to reduce the concentration to 14% is: 2 ml
To solve this problem, the formula and the procedure that we have to use is:
c1 * v1 = c2 * v2
Where:
c1= concentration of the concentrated solutionv1 = volume of the concentrated solutionc2 = concentration of the diluted solutionv2 = volume of the diluted solutionInformation about the problem:
c1 = 15%v1=28 mlc2 = 14%v2=?amount of water should be added=?Applying the dissolution of concentrations formula and clearing the volume of the diluted solution (v2) we get:
c1 * v1 = c2 * v2
v2 = (c1 * v1)/ c2
v2 = (15% * 28 ml)/ 14%
v2= 30 ml
In order to know how much water should be added we have to subtract 28 ml from the volume of the diluted solution:
amount of water should be added = v2 - v1
amount of water should be added = 30 ml - 28 ml
amount of water should be added = 2 ml
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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7) K₂CO3
# of molecules:
# of elements:
Name of element:
Total # of atoms:
The #3 is a
# of atoms:
(coefficient or subscript)
K₂CO₃ has three element and name of element is potassium, carbon, oxygen and total number of atom is six and the three atom is of oxygen
K₂CO₃ is an inorganic compound with chemical name potassium carbonate and it is also called carbonate of potash, or dipotassium carbonate or Pearl ash and it is a dipotassium salt of carbonic acid and it is widely used in the production of glass and soap
Here given compound is K₂CO₃ which has three element and name of element is potassium, carbon, oxygen and total number of atom is six means 2 potassium one carbon and three oxygen atom and the three atom is of oxygen and subscript and coefficient means number of element which is present in the compound
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An element whose atomic number is 19 is
I will mark brainliest
Answer:The answer is potassium.
HOW MANY GRAMS ARE IN 43.12 KG? WHAT IS THE UNIT?
Answer:43.12 KG = 43,120 grams
Explanation:1 kilogram is equal to 1,000 grams.
Answer:
43120 g
Explanation:
1 kg = 1000 g
43.12 = 1000(43.12) g
1000(43.12) = 43120
The unit is g because we are converting to grams, and the abbreviation for grams is g.
∴ 43.12 kg = 43120 g
What is the formula of the Lonic compound formed by the elements lithium and oxygen
Answer:
Li2O
Explanation:
Lithium is an alkali metal that has three protons and three electrons. Oxygen is a nonmetallic gas that has eight protons and eight electrons. Lithium and oxygen bond to form an ionic compound.
3Li : 1s2 2s1......Li+
8O : 1s2 2s2 2p4.....O2-
can anyone pls answerr
Answer:
3. J.J. Thomson & electron
4. b) nucleus
5. neutrons & protons
6. electrons
infrared and raman spectra of magnesium ammonium phosphate hexahydrate ( struvite ) and its isomorphous analogues . i . spectra of protiated and partially deuterated magnesium potassium phosphate hexahydrate
Magnesium potassium phosphate hexahydrate and a number of its deuterated counterparts were studied for their Fourier transform infrared and Raman spectra. By contrasting the spectra obtained at the boiling point of liquid nitrogen with those obtained at ambient temperature and by examining the spectra of a succession of partially deuterated MgKPO4
What is Infrared and raman spectroscopy ?Raman and infrared spectroscopy both investigate how radiation interacts with molecular vibrations, but they do so in different ways depending on how the photon energy is delivered to the molecule by altering its vibrational state.
While IR spectroscopy depends on a change in the dipole moment, Raman spectroscopy depends on a change in the polarizability of a molecule. In contrast to IR spectroscopy, which measures the absolute frequencies at which a sample absorbs light, Raman spectroscopy measures the relative frequencies at which a sample scatters light.Learn more about Spectroscopy here
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When pol filled another test tube to the top, the liquid formed a low dome, which is evidence of.
When pol filled another test tube to the top, the liquid formed a low dome, which is evidence of cohesion.
The dome-like shape forms some properties of cohesion due to the water molecules, or termed as their tendency to stick up to one another is expressed by the property of cohesion of water.
Cohesion can be considered as an act, state, and the process of sticking alike molecules together consisting of alike molecules or otherwise entities. An example showing cohesion is of course water molecules. The tendency of several water molecules to compact together is referred to as cohesion property and is held together by a particular cohesive force described as an intermolecular hydrogen bond.
Water is attracted to water itself whereas, in adhesion, water is attracted to some other substances. Adhesion and cohesion are generally considered properties of water that can affect every water molecule present on the Earth and also the water molecule interaction with molecules of other substances as well.
Cohesion is also depicted as an ordinal type of measurement and is generally described as having “high cohesion” or “low cohesion” properties. Modules having high cohesion tend to be preferable, due to which high cohesion is associated with a variety of desirable traits included in software such as reliability, reusability as well as understandability.
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The sun, like 80 to 90 percent of stars, is in which stage of life?(1 point) responses dying star dying star main sequence main sequence stellar formation stellar formation red giant red giant
Answer:
main sequence
Explanation:
now nae nae
The sun, like 80 to 90 percent of stars, is in main sequence stage of life.
The main sequence stars fuse hydrogen atoms to form helium atoms in their cores.
The main sequence is a band of stars that appears on plots of the Hertzsprung–Russell diagram
The Hertzsprung–Russell diagram puts each star on a graph according the star's brightness against its temperature.
About 90 percent of the stars in the universe are main sequence stars.
Nuclear reaction is in the inner core of the Sun and hydrogen is conveted into helium.
The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.
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histamine, a vasodilator, is responsible for a wide variety of physiological effects. rank the three nitrogen atoms in histamine in increasing order of basicity, putting least basic nitrogen atom first.
The increasing order of basicity, putting least basic nitrogen atom first are as follow:
N2 < N1 < N3.
The basicity of the atom is inversely proportional to the resonance.
What is resonance?Resonance is also termed as mesomerism, is defined as a way of telling the bonding in certain polyatomic ions or molecules by the combination of varies contributing structures into the resonance hybrid in the valence bond theory.
Since, in N2 due to the presence of lone pair of electron and it not even donate these lone pair of electron. On the other hand they take part in resonance, therefore the basicity of the N2 is least.
In N3 the lone pair of electron is present and it able to donate these lone pair of electron to the sp3 hybridization, therefore the basicity of the N3 is more than N2.
Thus, we concluded that increasing order of basicity, putting least basic nitrogen atom first are N2 < N1 < N3.
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Most hydrogen (H, #1) atoms have a mass of 1. How many protons would there be in one of these hydrogen atoms? (1 pt)
*
1 point
0
1
2
4
Answer: One
Explanation: All elements have just one proton and one neutron
A student is running an experiment in which 65.0 grams of BaI2 is needed, but the only jar of reagent in the lab is labelled barium iodide dihydrate. How many grams of the hydrate must the student weigh out in order to get the desired amount of the anhydrous compound?
The required amount of the dihydrate in the question is 71g of the dihydrate.
What is the mass of the dihydrate?We know that a compound could have a water of crystallization. This water of crystallization is attached to the molecule of the compound and is involved when we are calculating the molar mass of the compound.
Now we have the mass of the anhydrous compound that is required as 65 g.
Molar mass of the anhydrous compound = 391 g/mol
Molar mass of the dihydrate 427 g/mol
Given that;
Number of moles of hydrated compound = Number of moles of anhydrous compound
x/427 = 65/391
x = 65/391 * 427
x = 71 g
Thus, we would require 71g of the dihydrate.
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suppose that 4.67 g of a silver salt ( agx ) is dissolved in 715.0 ml of water. a current of 2.48 a , applied for 1430 s , is required to plate out all of the silver in solution. what is the mass percentage of silver in the salt?
Ag^t + e^- ------> Ag
I = 2.48 A
t = 1430 s
q = It = 2.22×1180 = 3729.6
ne- = q/F = 3729.6/96485 = 0.03+
What is mass percentage ?The mass percent is calculated by dividing the mass of the compound or solute by the mass of the element or solute. A percent is obtained by multiplying the result by 100. The mass percent formula is (mass of element in 1 mole of compound / mass of 1 mole of compound) x 100 to determine the amount of an element in a compound.
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What characteristics do elements within a group share with one another?
O all exist in the same state of matter
O all have the same atomic mass
O all have the same number of neutrons
O all have similar chemical and physical properties
Answer:All have Chemical and Physical properties
Explanation: