Answer:
Time of vaporization = 0.588 minutes
Explanation:
The latent heat of fusion is the heat required to change the substance from solid (ice) to liquid completely, without further increase in temperature.
The latent heat of vaporization is the heat required to change a liquid to gas completely, without an increase in temperature.
Latent heat of vaporization = 6.8 times Latent heat of fusion
This means that the time it takes for the latent heat of vaporization to complete vaporization is 6.8 times lesser than the time it takes for the latent heat of fusion to complete fusion
Time of vaporization = 6.8 times lesser than time of fusion
Time of vaporization = (time of fusion) ÷ 6.8
where: Time of fusion = 4 minutes
∴ Time of vaporization = 4 ÷ 6.8
Time of vaporization = 0.588 minutes
Look at the four chemical reactions. Reaction 1: 2H2 + O2 → 2H2O Reaction 2: 2NaCl → 2Na + Cl2 Reaction 3: CaO + H2O → Ca(OH)2 Reaction 4: 4Fe + 3O2 → 2Fe2O3 Which statement identifies the reaction that is different from the rest and explains correctly why it is different? (1 point) Reaction 2, because a single reactant is decomposed Reaction 1, because two reactants have decomposed Reaction 2, because a single ion is replaced in a compound Reaction 1, because two ions have interchanged their positions
Answer:
Reaction 2, because a single reactant is decomposed
Explanation:
It's the only one where the product was decomposed while the others became one. I took the quiz and it was correct.
Bombardier beetles inject boiling hydrogen peroxide, or H2O2, into the victims. It then decomposes into hydrogen and oxygen gas. How many grams of oxygen can be produced if 0.128 grams of hydrogen peroxide are decomposed?
Answer:
0.12 g of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
H2O2 —> H2 + O2
Next, we shall determine the mass of H2O2 that decomposed and the mass of O2 produced from the balanced equation. This is illustrated below:
Molar mass of H2O2 = (2×1) + (16×2)
= 2 + 32
= 34 g/mol
Mass of H2O2 from the balanced equation = 1 × 34 = 34 g.
Molar mass of O2 = 16×2 = 32 g/mol
Mass of O2 from the balanced equation = 1 × 32 = 32 g
Summary:
From the balanced equation above,
34 g of H2O2 decomposed to produce 32 g of O2.
Finally, we shall determine the mass of O2 produced from the decomposition of 0.128 g of H2O2. This can be obtained as follow:
From the balanced equation above,
34 g of H2O2 decomposed to produce 32 g of O2.
Therefore, 0.128 g of H2O2 will decompose to produce = (0.128×32)/34 = 0.12 g of O2.
Therefore, 0.12 g of O2 was produced.
Find the independent variable and the dependent variable :)))
Answer:
dependent variable: plant growth
independent: sunlight impact/amount of light
Explanation:
Express in scientific notation.
1.24 x 10^6/
6.2 x 10^-3
Answer:
1.24*10^6=1.24*1000000=1240000
6.2*10^-3=6.2*0.001=0.0062
Explanation:
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Constants (“controlled variables”) and a control are easily confused by students! How would you explain the difference between the two words?
Answer:
Please find the explained difference below
Explanation:
In a scientific experiment, the CONTROLLED VARIABLE, also known as CONSTANT, is the the variable that is kept unchanged by the experimenter throughout the course of the experiment. The constants are not part of the actual experiment but altering them can influence its outcome.
A control group is one of the two groups in an experiment (the other being experimental group) that doesn't receive the variable being manipulated (independent variable). The control group is the same as the experimental group except that the independent variable is unchanged in the control group. It is used to make a comparison with the experimental group.
For example, in an experiment to test the effect of sunlight on plant growth. Some plants were exposed to sunlight while some were placed in the dark. The CONTROL group of this experiment are the plants placed in the dark (no light). They didn't receive any treatment.
The constants of this experiment can be same amount of water, same type of plants used etc. This is done in order not to affect the outcome of the experiment.
Calculate the density from the following information: A red block had a mass of 15.7 g. It was placed into a graduated cylinder containing 10.0 mL of water. The volume then rose to 17.2 mL when the block was added.
Answer:
Density should be 8.5
Explanation:
When you subtract 17.2-10.0 for water displacement you get 7.2 which is the volume and you divide it by 15.7 so your equation will be 15.7/7.2 = 8.5
Answer:
4.1
Explanation:
What must happen for a natural resource to become a synthetic material?(1 point) It needs to go through a chemical reaction. It needs to be pounded very thin. It needs to be dried out. It needs to go through a phase change.
Answer:
It needs to go through a chemical reaction
Explanation:
Natural resources undergoes chemical reaction to become synthetic materials.
Natural material undergoes several chemical changes to chnage the characterstics of the resources into synthetic material.
Some examples of synthetic materials are medicines, plastics, and new fuels which are extracted from trees or plants, natural fibers, and petroleum.
Hence, the correct option is "It needs to go through a chemical reaction".
Answer:
It needs to go through a chemical reaction.
explain why the planet Venus rotates the opposite way?
Answer:
The reason why it rotates the opposite way is due to an asteroid collision forcing the planet to spin backwards and is also the reason why a day on Venus is longer then a year on Venus
Crystal structures with ions must have ____________.a. a positive chargeb. a negative chargec. electrical neutralityd. a 2+ charge
Answer:
c. electrical neutrality.
Explanation:
A crystalline solid possesses a rigid and long-range order; its atoms, molecules, or ions occupy specific positions. The arrangement of such particles in a crystalline solid is such that the net attractive intermolecular forces are at their maximum.
Ionic crystals, particularly, have two important characteristics:
(1) They are composed of charged species.
(2) Anions and cations are generally quite different in size.
The forces holding the atoms together are electrostatic attractions. Examples of these types of crystals include NaCl, LiF, MgO, CaCO₃.
Since they are composed of anions and cations, in stoichiometric amount, they are to be said electrically neutral.
In the 18th century, Italian biologist Lazzaro Spallanzani designed an experiment supporting the hypothesis that gastric juices are partly responsible for digesting food. Which human illness did Spallanzani's work eventually shed light on? intestinal ulcers mouth ulcers stomach ulcers skin ulcers
Stomach ulcers, I've read it online and I take the test
In the 18th century, Italian biologist Lazzaro Spallanzani designed an experiment supporting the hypothesis that gastric juices are partly responsible for digesting food. The human illness which Spallanzani's work eventually shed light on Stomach ulcers.
What is pH ?
pH is used to measure whether the substance is acidic, basic or neutral and the range is 0 - 14.
What is Gastric acid ?Gastric acid is also called gastric juice or stomach acid it is made up of water, enzymes, hydrochloric acid, electrolytes. The pH of gastric acid is between 1 and 3 that means it is acidic is nature.
Thus from the above conclusion we can say that In the 18th century, Italian biologist Lazzaro Spallanzani designed an experiment supporting the hypothesis that gastric juices are partly responsible for digesting food. The human illness which Spallanzani's work eventually shed light on Stomach ulcers.
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If an ice cube has a mass of 25 grams and it melts, what would the mass of the liquid water be?
Answer:25grams
Explanation: the mass stays the same even when it changes form
What is the best way to represent the number 1,550,000
Answer:
You can represent as a exponent. That will be the best way.
Explanation:
Electronic configuration of 11N
Answer:
The Electronic configuration of 11N is
[Ne]3s1
How you could use the scientific method to learn whether water really does take longer to boil if you are watching it.
Answer:
What you need is a thermometer and a clock.
Explanation:
A black compound reacts with acid to give a blue green solution. Name the compound. Write the reaction
Answer:
compound is CuO.
Explanation:
rxn:
CuO + 2HCl = CuCl2 (Blue green color) + H2O
True or False ... In a chemical change, a new
substance is formed.
Isabella wants to determine the mass of a metal block what is the SI unit for mass
Answer:
Kilogarm
Explanation:
Just took a test on this!
The quantity of each type of organelle in a cell varies depending on the tasks the individual cell must perform. If a scientist needed to find cells that contained a large number of chloroplasts, where would be the best place to look?
Answer:
among plants or in a garden
Explanation:
so first thing is to establish the main function of chloroplasts which is photosynthesis the next thing is to establish which organisms primarily carry out this process which are plants therefore mostly in plant cells hope it helps
Which particles are found in an atom have charges
Answer:
protons and electrons
Explanation:
protons are positivley charged
electrons are negetively charged
but neutrons have no charge
Explain The process of a pot of boiling water left for to long drying up.
Answer:Evaporation
Explanation:
The scientific method is "flexible". What does that mean? Why is that
important and necessary?
Answer:
we can reach the same conclusions by applying different experimental and observational procedures
Explanation:
The scientific method is a process that can be summarized in the following steps: 1-to raise a question, 2-to make a hypothesis, 3-to obtain data from observations and/or experiments, and finally, 4-to obtain conclusions that enable to confirm (or reject) the hypothesis. The scientific method is flexible because it is not necessary to follow 'stringent' guidelines in order to reach the same conclusions. In consequence, the predictions derived from such results can be tested again to determine the veracity of the results.
What happens when an X-ray is shot at an atom
Answer: X-ray fluorescence from atoms occurs when a high energy particle or X-ray knocks an electron free from the innermost energy level of an atom, creating an unstable atom.
Explanation:
Several interactions can happen when an atom is exposed to an X-ray, depending on the energy of the X-ray and the properties of the atom.
The most frequent interaction is referred to as the photoelectric effect, in which an X-ray photon collides with an atom's inner-shell electron to evict it from its orbit and ionize the atom. As a result, an ion and a free electron are created. Another potential interaction is Compton scattering, in which an outer-shell electron receives some of the energy from the X-ray photon and is expelled at a different angle with less energy as a result. Additionally, pair production, which results in the formation of an electron-positron pair, can happen at very high energies. In many applications, these interactions are crucial.
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uestion 3 (1 point)
1. Calculate the density of a liquid that has mass of 14.0g and volume of 18.0 cm? Will this liquid float on
top of water or will it sink? (Density of water is 1.0 g/mL)
I
formula for density of liquid = mass ÷ vol
= 14.0 g ÷ 18.0 cm³
= 0.77778 g/cm³ ( 5sf)
= 0.778 g/cm³ ( 3sf )
18.0 cm³ is the same as 18.0 ml
Therefore, the liquid will float on water as the water is denser than the liquid.
18.0 cm³ is equivalent to 18.0 ml, in light of the fact that water is denser than liquid, the liquid will float on it.
What is the density of a liquid?Density is defined as d = M/V, where M stands for mass and V for volume. The unit of density that is most frequently used is grams per cubic centimeter.
The formula for liquid density is mass divided by volume.
= 14.0 g ÷ 18.0 cm³
= 0.77778 g/cm³
= 0.778 g/cm³
The same procedure used to determine a solid's density is used to determine a liquid's density. Calculate the fluid's mass, then its volume, then divide mass by volume.
To determine the fluid's mass, weigh the fluid in the container, pour it out, weigh the empty container, and then subtract the empty container's mass from the mass of the filled container.
Therefore, in light of the fact that water is denser than liquid, the liquid will float on it.
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which part of a plant conducts food and water to different part of it?
Answer:
stem is the correct answer
Explanation:
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A block of aluminium occupies a volume of 11.1 mL and weighs 43 g. What is it's density? Give answer with one decimal.
Answer:
Density = 3.9 g/ mLExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
mass = 43 g
volume = 11.1 mL
Substitute the values into the above formula and solve for the density
That's
[tex]Density = \frac{43}{11.1} \\ = 3.873873...[/tex]
We have the final answer as
Density = 3.9 g/ mL to one decimal place
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What is it known as
Answer:
Some of the most incredible discoveries in science were made because the data looked wrong! Once you have the data, you may need to perform a mathematical analysis to support or refute your hypothesis. Conclusion Conclude whether to accept or reject your hypothesis. There is no right or wrong outcome to an experiment, so either result is fine.
2. A 90 g bag of trail mix is contains 22% nuts, 35% granola, 18% dried fruit. The rest is chocolate chips.
Calculate how many grams of each component there is.
nute
convert 500 inches to m.
1000mm =1m
1inch = 2.54 cm
10mm=1cm
Answer:
12.7m
Explanation:
FORMULA
for an approximate result, divide the length value by 39.370078
How many calories are required to convert 2 grams of ice at 0 degrees C to water vapor at 100 degrees C?
Answer:
360.8987 GRAM CALORIE OR 0.3608987 KILOCALORIE IS THE CALORIE REQUIRED TO CONVERT 2 GRAMS OF ICE AT 0 DEGREES C TO WATER VAPOUR AT 100 DEGREES C.
Explanation:
To convert 2 g of ice at 0 C to water vapor at 100 C:
First, the ice will be converted to water at 0 C
Then, water at 0 C to water vapor at 100 C
We must know that the latent heat of fusion for ice is 3.35*10^5 J/kg
the standard heat of enthalpy of water = 4200 J/kg
So therefore
Total heat to convert ice at 0 c to water vapor at 100 c is:
= M Lf + mc Q
= 2/ 1000 * 3.35 * 10^5 + 2/1000 * 4200 * (100 -0)
= 0.002 * 3.35 ^ 10^5 + 0.002 * 4200 * 100
= 0.0067 * 10 ^5 + 840
= 670 + 840
= 1510 J
The heat required to convert 2 g of ice at 0 c to water vapor at 100 C is 1510 J and to get the calorie value we divide the answer in joules by 4.184.
1510 joules = 360.8987 gram calories or 0.3608987 kilocalorie.
Amount calories are required to convert into vapor is 1,440 calories
Latent heat of water:Given that;
Amount of ice = 2 grams
Latent heat of water = 540 calorie
Find:
Amount calories are required to convert into vapor
Computation;
Heat required to melt at 0°C to water at 0°C = 2 × 80
Heat required to melt at 0°C to water at 0°C = 160 calorie
Water from 0°C to 100°C = 2 × 100
Water from 0°C to 100°C = 200 calorie
Water from 100°C to 100°C vapor = 2 × 540
Water from 100°C to 100°C vapor = 1,080 calorie
Amount calories are required to convert into vapor = 160 + 200 + 1080
Amount calories are required to convert into vapor = 1,440 calories
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5(3x) - 7y2=?, when x = 3 and y= 2
Answer:
This might help u......