Would you expect the heterogeneous method to give a higher percent nickel or a lower percent nickel than the homogenous method? Explain your answer.
(From the Quantitative Determination of Nickel in a Compound By Gravimetric Analysis lab)
Answer:
Heterogeneous method
Explanation:
In general, a gravimetric method of analysis consists
of the following steps:
Weighing and dissolving the sample in the proper solvent.
Carrying out a sequence chemical reactions to obtain a suitable product.
Determining the mass of the product
Calculating the composition of the sample rom mass of product and information about the original sample.
Precipitates obtained by heterogeneous methods are often difficult to filter and are always contaminated by adsorbed and occluded impurities which ultimately increase the percentage yield of nickel due to occluded impurities.
The gravitational force acting on an object is also called the object's _____. A) mass B) weight C) density D) volume
Answer:
B) weight
Thats it no explanation
Answer:
B) weight
Explanation:
Weight is gravity's pull on an object. This would change if you went to the moon. Gravitational
Mass is the amount of the object. This would stay the same if you went to the moon. Non-gravitational
Given its reactive nature, oxygen is essential to cellular metabolic reactions. Peroxisomes use oxygen to break down fatty acids. In doing so, they use oxygen to remove hydrogens from fatty acid chains, yielding hydrogen peroxide (H2O2). Cells also routinely release potentially destructive molecules, such as superoxide (O2) in signaling, self-defense, or as a metabolic side product. Superoxide combines with hydrogen peroxide to make an even more destructive molecule called a hydroxyl radical. Therefore, the removal of these two reactants is a routine "housekeeping" chore within the cell. Which enzyme is used to prevent hydrogen peroxide accumulation in the peroxisome?
Answer:
Catalase
Explanation:
These reactive oxygen specie or free radicals that cause damage or injury to cells also lead to oxidative stress if unchecked by antioxidants. As suggested in the question, there are several enzymes that act as antioxidants in mitigating the effects of these reactive oxygen specie or free radicals. These enzymes include catalase, superoxide dismutase and glutathiones (such as glutathione s-transferase).
The enzyme that however prevents the accumulation of hydrogen peroxide (H₂O₂) in the peroxisome is catalase. Catalase is an enzyme that is present in the peroxisome; it (catalase) detoxifies/acts on H₂O₂, converting it (H₂O₂) into water and oxygen.
What is 1 item that is a compound?
Give an example of how the 1 item is a compound :D
The first organisms to appear on Earth did not need?
a.
oxygen.
c.
cells.
b.
nitrogen.
d.
chemicals.
PLZ HURRY
I already know that the answer is NOT D.
Answer:
d
Explandation:
Answer:
A.
Explanation:
Because the first organism was bacteria and bacteria does not need oxygen to grow
Which is true about the transfer of electrons? Metals tend to gain electrons to form positive ions. Metals tend to lose electrons to form positive ions. Nonmetals tend to gain electrons to form positive ions. Nonmetals tend to lose electrons to form negative ions.
Answer:
Metals tend to lose electrons to form positive ions.
6. Since the valves act as the doors of the heart, what might happen if these
doors do not close?
Answer:
If the valves of the heart do not close, the blood will flow backwards. Blood will escape back into the chambers rather than flowing forward through the heart or into an artery.
Explanation:
Which formula represents hydrofluoric acid?
HFO
H2F
HFO 4
HF
Answer:
it's HF
Explanation:
How many moles are in 75.0 grams of K2S?
Answer:
0.6802 mol
Explanation:
1 grams K2S = 0.00907 mol
0.00907 x 75 = 0.6802 mol
Determine the mass of water in kg, if 4300 cal of energy is placed in water, resulting in a temperature change to 101.0 oC from 92.5 oC.
Answer:
0.5059kg
Explanation:
The heat absorbed for the water is determined using the equation:7
Q = C×m×ΔT
Where Q is heat absorbed (4300cal)
C is specific heat (1cal/g°C)
m is the mass in grams
ΔT is change in °C (101.0°C - 92.5°C = 8.5°C)
Replacing:
4300cal = 1cal/g°C×m×8.5°C
505.9g = m
In kg, the mass of water is:
0.5059kg
What is a good description of potential energy? (1 point)
energy of reaction
stored energy
energy of motion
conserved energy
please help me asap!!
Answer:
I think the answer is stored energy
Explanation:
The energy that an item has stored inside it as a result of its location in relation to a zero point is known as potential energy. If an item is placed at a height above the zero height, it has gravitational potential energy. A good description of potential energy is stored energy.
What is potential energy ?Potential energy is the power that an item may store due to its position in relation to other things, internal tensions, electric charge, or other circumstances.
The energy released during a chemical reaction is known as chemical potential energy. It is the energy that was accumulated before chemical fusion. Crackers, a charged battery, etc. are a few examples.
Potential energy has a simple definition, It is a type of energy that possesses the ability to perform work but is not now performing work or exerting any force on any other things. In other words, potential energy concerns object positions rather than object movements.
Thus, option B is correct.
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How much of the stock solution of 2.0 M of Blue 1 dye would be needed to
create 10 mL of a 0.5 M solution of Blue 1 dye?
Answer:
2.5 mL
Explanation:
The following data were obtained from the question:
Molarity of stock solution (M₁) = 2 M
Molarity of diluted solution (M₂) = 0.5 M
Volume of diluted solution (V₂) = 10 mL
Volume of stock solution needed (V₁) =?
Thus, we can obtain the volume of the stock solution needed by using the dilution formula as illustrated below:
M₁V₁ = M₂V₂
2 × V₁ = 0.5 × 10
2 × V₁ = 5
Divide both side by 2
V₁ = 5/2
V₁ = 2.5 mL
Thus, 2.5 mL of the stock solution is needed.
According to the big bang theory, which describes the universe before the actual big bang occurred? Multiple, cold, dense points, each larger than the sun multiple, hot, dense points, each smaller than an atom single, cold, dense points larger than the sun single, hot, dense points smaller than an atom
Answer:
The correct answer is hot, dense points; each smaller than an atom
Explanation:
The big bang theory was proposed to suggest the expansion of the universe by describing the origin of all components of the universe and it's planetary bodies. It suggested that the whole universe was in a state of high temperature and highly dense points (which were smaller than atoms) but continuously expanded by cooling down which gave rise to the formation of subatomic particles, atoms e.t.c.
Answer:
Its D on edge 2021
Explanation:
just took the test
Scientific experiments are specially designed to evaluate explanations for an observed phenomenon. A student decides to conduct an experiment to determine the effect that the amount of time spent in sunlight has on the overall growth of a plant. The student will carry out the experiment using two identical plants that will only spend different amounts of time in sunlight. All other aspects necessary for growth will remain identical for each. In the experiment described, what would be the amount of water given to each plant?
Answer:
This question lacks options, the options are:
a. an observation
b. a dependent variable
c. an independent variable
d. a control
The answer is D. Control
Explanation:
According to the question, a student decides to conduct an experiment to determine the effect that the amount of time spent in sunlight has on the overall growth of a plant. The student keeps all other variables needed for the plants' growth in this experiment the same/identical. These variables kept identical by the student is called CONTROL OR CONSTANT.
One of the CONTROL is the amount of water given to each plant. The amount of water given to the two plants being tested must be the same. Hence, WATER in this experiment is a CONTROL VARIABLE.
Note that, the independent/manipulable variable is the amount of time spent in sunlight while the dependent/measurable variable is the growth of the plants.
Answer:
The answer is D control
Explanation:
C Give two reasons why the formation of aluminium by electrolysis is very
expensive:
Answer:
It is expensive, largely because of the amount of electricity required in the extraction process. Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis.
Energy appears in many forms what form of energy is lightning
Answer:
thermal and light energy
What isotope undergoes beta decay to produce xenon-131
can someone help me please?
In general what types of common things are ionic compounds?
Answer:
LiF
LiCl
LiBr
Lil
NaF
NaCl
NaBr
Nal
Explanation:
ionic compounds are formed between metals and non-metals
PLZ HELP ME ASAP IM TAKING AN EXAM :(
Protons have a positive charge. Neutrons have no charge. Electrons have a negative charge. Given this information, what can you conclude? *
a.)The nucleus contains protons & electrons
b.)The nucleus contains an overall positive charge
c.)The nucleus contains an overall negative charge
d.)The nucleus contains neutrons and electrons
Answer:
B - The Nucleus has an overall positive charge
Explanation:
Nuclei consist of Neutrons and Protons; Electrons are not included in the Nucleus, they surround it.
Is it possible for the sun to burn out tomorrow? Why or why not?
Answer:
It is and isn't possible at the same time.
Explanation:
Stars form when enough hydrogen collects in one place that the sheer gravitational attraction of the mass to itself causes thermonuclear fusion to commence. Unlike a nuclear bomb, the reaction doesn’t last for milliseconds, but for billions of years, as convection currents carry fresh supplies of unfused hydrogen into the reaction zone, and as heavier, already fused material undergoes fusion again, starting a stepladder of elemental construction, building the table of elements from hydrogen up toward iron as far as conditions will allow. So basically, the sun doesn’t burn all at once for the same reason a candle doesn’t: It relies on convective processes to freshen its fuel supply
The average speed of a car during 5 hours is 50 miles per hour. What is the total distance traveled by the car?
O 0.1 miles
O 10 miles
O 250 miles
O 500 miles
Answer: 250 miles
The rate for 1 hour is 50 miles per hour. We must multiply 50 by 5 to find the distance drove in 5 hours.
50 x 5 = 250.
The answer to the question is 250.
A standard weight used to calibrate balances has a mass of 100.00 g and a volume of 12.0 mL. What is the density of this standard weight in g/mL?
88.0 g/mL
8.33 g/mL
0.12 g/mL
7.33 g/mL
Answer:
The answer is 8.33 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 100 g
volume = 12 mL
We have
[tex]density = \frac{100}{12} = \frac{25}{3} \\ = 8.333333...[/tex]
We have the final answer as
8.33 g/mLHope this helps you
Do you think “doing the wave” is a wave? Why or why not?
Answer:
i mean kinda they should throw people in the air tho lol
Explanation:
2. Describe how decomposers contribute to the cycling of nutrients in an ecosystem.
PLEASE I NEED THIS ASAP
Answer:
Explanation:
Decomposers get nutrients and energy by breaking down dead organisms and animal wastes. Through this process, decomposers release nutrients, such as carbon and nitrogen, back into the environment. These nutrients are recycled back into the ecosystem so that the producers can use them.
The girl in the picture is at the highest point in swinging and starts to come down. Which statement could describe the changes in energy for her?
(1 point)
A) Potential energy is increasing, and kinetic energy is decreasing.
B) Kinetic energy is increasing, and potential energy is decreasing.
C) Kinetic and potential energy are increasing.
D) Kinetic and potential energy are decreasing.
2. Earth is closest to the sun around January 3 each year, and it is farthest from the sun near July 4. Around which date would Earth be moving the slowest as it orbits the sun? (1 point)
A) October 3
B) April 4
C) July 4
D) January 3
3.At which of the three points, if any, is the bicyclist’s potential energy increasing?
(1 point)
A)The potential energy is increasing at point C because the bicyclist is increasing in elevation at that point.
B)The potential energy is increasing at point A because the bicyclist is moving fastest at that point.
C)The potential energy is always decreasing because the bicyclist continues to move forward.
D)The potential energy is increasing at point B because the bicyclist is highest there
4.How would potential energy and kinetic energy change going down stairs one at a time or two at a time?(1 point)
A) Going down stairs two at a time means you will get down in fewer steps, which saves you some kinetic and potential energy.
B) If you go down stairs two at a time, then you are going a greater distance, which will decrease your potential energy. Your kinetic energy will be less when you land on the stair.
C) Going down stairs two at a time will give you twice as much kinetic energy by the time you reach the bottom stair.
D)If you go down stairs two at a time, then your potential energy relative to the stair is greater. Your kinetic energy will be greater when you land.
Answer:
1) Kinetic energy is increasing, and potential energy is decreasing.
2) July 4th
3) The potential energy is increasing at point C because the bicyclist is increasing in elevation at that point.
4) If you go down stairs two at a time, then your potential energy relative tot he stair is greater. Your kinetic energy will be greater when you land.
Explanation:
Hope this helps!
Answer:
Question 1: B- Kinetic energy is increasing, and potential energy is decreasing.
Question 2: C- July 4
Question 3: A- The potential energy is increasing at point C because the bicyclist is increasing in elevation at that point.
Question 4: D- If you go down stairs two at a time, then your potential energy relative tot he stair is greater. Your kinetic energy will be greater when you land.
Hope this helps!
Please mark as brainliest if helps!!
The majority of the mass of the atom is located in the___
Answer:
Nucleus
Explanation:
Since electrons are 1/1840 of the weight of a proton or a neutron, all of which are in the nucleus, scientists often don't include them.
calculate the average atomic mass of 7.4% Li-6 92.6% Li-7
7.016003 amu.
yes this is the answer yw
He is chemical symbol for which element
A)helium
B)hafnium
C)hassium
D)hydrogen
Answer:
it is helium so A.........
He is the chemical symbol for Helium.
Which of these elements is the most reactive?
potassium
calcium
titanium
scandium
Answer:
Scandium
Explanation:
Out of the given ones the element that is most reactive is potassium. The correct option is A.
What is reactivity series?A reactivity series is an evidence based, calculated, and architecturally analytical advancement of a series of metals arranged from highest to lowest by their "reactivity."
The reactivity series is a group of metals arranged in decreasing order of reactivity.
It is used to calculate the products of single displacement responses in which one metal A replaces a further metal B in a solution if A is higher in the series.
The metal reactivity sequence is an array of metals arranged in descending order of their chemical reactivity. It aids in predicting whether one metal can displace another in a displacement reaction.
Here in the given options, potassium is the most reactive as it is present in the topmost position of the reactivity series.
Thus, the correct option is A.
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