The question is incomplete, the complete question is;
Dr. Murray's science class recently read about an experiment that had surprising results. They decided to perform the experiment in their class, but they used more advanced methods. Their results
must be completely different, but they are more reliable.
could be the same as before, or they could be completely different.
must be the same as the recorded results, but they are more reliable.
could be the same as the recorded results, or they must be inconclusive.
Answer:
could be the same as before, or they could be completely different.
Explanation:
Now we know that in carrying out a scientific research, there is such a thing as replication.
Replication means that other scientists in other places carry out the same experiments previously done and expect to obtain the same results as the first time the experiment was done.
However, this is not a case of replication because a different and more advanced method was used in the experiment. Once the methodology of the experiment has been changed, then the results could be the same or different. Hence the answer above.
what is crystal?.give any example
Answer:
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.Example- Snowflakes, diamonds, and table salt.
Answer:
Examples of everyday materials you encounter as crystals are table salt (sodium chloride or halite crystals), sugar (sucrose), and snowflakes. Many gemstones are crystals, including quartz and diamond. There are also many materials that resemble crystals but are actually polycrystals
Explanation:
a crystal is a piece of a homogeneous solid substance having a natural geometrically regular form with symmetrically arranged plane faces.
calculate the mass of one atom of helium.
Answer:
One atom lf helium has a mass of 4 u
Know that 1 u =1.66. 10-24g
where are the largest elements
Answer:
the first two elements of array are checked and the largest of these two elements are placed in arr[0]
the first and third elements are checked and largest of these two elements is placed in arr[0] .
this process continues until the first and last elements are checked.
Explanation:
Then you would find the largest Elements
Answer:
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
An ionic bond is made from a ___ and a ___.
The______________ the maximum amount of product that could be formed from the given amounts of reactants. The _______ is the amount of product that is actually formed when the reaction is carried out in the laboratory. The ___________ is the ratio of the actual yield to the theoretical yield, expressed as a percentage.
1.percent yield
2.theoretical yield
3.actual yield
HELP ASAP 50 POINTS & WILL BE MARKED BRAINLY
The Theoretical yield is the highest amount of product that could be formed from the allocated amounts of reactants.
What is Theoretical yield?
The Theoretical yield is the greatest amount of product that could be formed from the given quantities of reactants.
The Actual yield is the quantity of product that is formed when the response is carried out in the laboratory.
The Percent yield is the ratio of the authentic yield to the theoretical yield, described as a percentage.
Percentage Yield Formula: When the product that we are obtained after a chemical reaction is known as the yield. We can estimate this accepted yield in moles or grams.
It is the ‘authentic yield’ that we acquire after the completion of a chemical reaction. Separated from this, established on our estimation, we calculate the anticipated yield of a reaction comprehended as the ‘theoretical yield.’
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Which unit is used to express the amount of energy in food?
Answer:
Calories or Protein don't judge me if i'm wrong on both -__-
Explanation:
Vertical columns on the periodic table are known as
and horizontal rows are called
O periods, groups
groups, periods
O metals, nonmetals
O metalloids, metals
Answer:
groups and periods
Explanation:
toms of elements at the top of a group on the periodic table are smaller than the atoms of elements at the bottom of the group. How does this help explain the difference in the reactivity of metals within a group?
Answer:
Atoms of elements at the top of a group on the periodic table are smaller than the atoms of elements at the bottom of the group. ... The valence electrons of the larger atoms are farther from the nucleus and are easier to remove, so the metals near the bottom are more reactive than those at the top.
when an atom reacts, its goal is to become more stable by filling is outer electron shell what are three ways that an atom can fulfill this goal
The three ways that an atom can fulfill this goal is to give away electrons, take an electron, and share electrons.
When an atom reacts ,its goal is to become more stable by filling its outer electron shell by gaining, loosing or sharing electrons.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Le Châtelier's principle applies to gas exchange reactions in human lungs.
Carbon dioxide gas combines with water in the blood to form carbonic acid:
H2O + CO2 = H2CO3
During exercise, the concentration of CO2 in the blood increases. How would
this affect the reaction's equilibrium?
A. It would favor the forward reaction.
B. It would favor the backward reaction.
C. It would maintain the reaction's equilibrium.
D. More information is needed to assess the reaction's equilibrium.
Answer:
The correct option is;
A. It would favor the forward reaction
Explanation:
Le C_h_a_t_e_l_i_e_r_'s principle states that for a system in dynamic equilibrium a change in the volume, pressure, concentration, or temperature will cause a predictable shift in the reaction to bring about a shift in the equilibrium position which counteracts the change and bring about the establishment of a new equilibrium
Therefore, in the reaction, H₂O + CO₂ → H₂CO₃, we have;
An increase in the amount of the CO₂ concentration in the blood, increases the quantity of the reactants more than the quantity present at equilibrium, therefore, the number of reaction between the H₂O and the CO₂ increases resulting in the formation of more H₂CO₃, therefore, favoring the forward reaction.
Answer:
A. It would favor the forward reaction.
Explanation:
A.P.E.X
I
3. In words, explain what occurs in terms of electrons when
beryllium reacts with oxygen
Explanation:
On the whole, the metals burn in oxygen to form a simple metal oxide. Beryllium is reluctant to burn unless it is in the form of dust or powder. Beryllium has a very strong (but very thin) layer of beryllium oxide on its surface, and this prevents any new oxygen getting at the underlying beryllium to react with it
Which statement explains why water is classified as a compound
Answer:
Water is a compound. It contains more than one element: hydrogen and oxygen atoms are joined together;
Can any person help me for this problem? Anyone's welcome
Answer:
The anode made of the impure copper
The cathode made of pure copper
The electrolyte of copper (II) sulfate CuSO₄ solution
The silver impurities at the anode due to their high tendency of accepting electrons and being a stronger reducing agent than either copper or zinc will remain relatively in place and relatively stable and will not actively take part in the oxidation reaction taking place at the anode
The zinc impurities will be the first element of the three metals to give up electrons and go into the solution as zinc ions due to their high tendency to loan out two electrons and become oxidized into Zn²⁺ ions
The drawing of the electrolytic cell created with Microsoft Visio is attached
Explanation:
When 2 or more different atoms chemically combine A. Element B. Compound
Answer:
compound
Explanation:
Answer:
compound
Explanation:
A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds. When two hydrogen atoms combine with one oxygen atom, it becomes the compound water
CrO3 = Cr2O3 + O2
how do i balance this?
Answer:
4cro3=2cr2o3+3o2
Explanation:
on left hand side there is 4cr and 12o where as now on wright hand side we have 4cro6+6o which makes 4cr and 12o which is equal to the left hand side.
Answer:
4CrO3====> 2 Cr2O3 + 3O2
Explanation:
Before dealing with the Cr, I think you might want to deal to work with the oxygen in Cr2O3
You might want to turn that into an even number. You could put a 2 in front of the Cr2O3, but looking ahead, I can see that will give you a fractional amount for the O2. So I'll use a 4
CrO3 ===> 4 Cr2O3 + O2
That means you have 8 Cr s on the right. Balance that on the left
8CrO3 =====> 4 Cr2O3 + O2
You've balanced The Cr s. So now lets look at the oxygens. There are 8*3 oxygens on the left hand side. The right has 12 + 2. Don't touch the Cr2O3. You are done with them.
You need 12 more oxygens on the right. You have 2. So multiply the Oxygens by 6
8CrO3 ===> 4 Cr2O3 + 6 O2 There's a factor of 2 common. Divide by 2
4CrO3====> 2 Cr2O3 + 3O2
If the potato solution was boiled for 10 minutes and cooled for 10 minutes before being tested, the average time for the disks to float to the surface of the hydrogen peroxide solution would be___________.
Answer:
more than 30 seconds
Explanation:
theres some extra
question : To study the actions of the enzyme catalase on hydrogen peroxide, students performed the following experiment. Catalase was extracted from potatoes and stored on ice. The following hydrogen peroxide solutions were made: 1%, 5%, 10%, 15%. Filter paper disks were soaked in the catalase then dropped into each of the solutions. Enzyme activity was measured by the time it took for the disks to float from the bubbles produced. Here is the data:
Which of the following best describes why the disks float faster to the surface in more concentrated solutions?
asnwer
the higher substrate concentrations in the more concentrated solutions speeded up the reaction
yw!
THIS IS DUR IN LIKE 15 MINS PLS
Answer:
A. Wisconsin
Explanation:
In the graph, Wisconsin has the highest speed limit.
What is Industrial chemistry?
Answer:
study of chemical used in industries
Red light has a wavelength of 700 nm and a frequency of 4.3 x 10^14 s^-1. What is the energy of a single photon of red light?
A. 2.85 x 10^-20
B. 2.85 x 10^19
C. 2.85 x 10^-34
D. 2.85 x 10^-19
Answer:
E = 2.85×10⁻¹⁹ J
Explanation:
Given data:
Wavelength of light = 700 nm
Frequency of light = 4.3×10¹⁴ s⁻¹
What is the energy of light = ?
Solution:
Formula:
E = h × f
h = plancks constant = 6.63×10⁻³⁴ Js
by putting values,
E = 6.63×10⁻³⁴ Js × 4.3×10¹⁴ s⁻¹
E = 28.5×10⁻²⁰ J
E = 2.85×10⁻¹⁹ J
PLZ HELP!!! Choose A B or C
Answer:
c?
Explanation:
sorry, im not too great with this lol. i probably have it wrong, so i wouldnt really trust my answer lol.
A solution is prepared by dissolving 250 g of CH4N2O into 6.0 L of solution. What is the molarity of this solution?
________M
Answer:
Molarity = 0.65 M
Explanation:
Given data:
Mass of CH₄N₂O = 250 g
Volume of solution = 6.0 L
Molarity of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of solute:
Number of moles = mass/molar mass
Number of moles = 250 g/ 64.08 g/mol
Number of moles = 3.9 mol
by putting values,
Molarity = 3.9 mol / 6.0 L
Molarity = 0.65 M
A ____ is the remains of a once-living organism found in layers of rocks, ice, or amber
Answer:
fossil
Explanation:
the dead organism is called a fossil i think
Answer:
A fossil is the remains of a once-living organism found in layers of rocks, ice, or amber
Which of these is a sentence fragment?
The dog barked.
The skateboard wiggled back and forth.
The dog that was riding a skateboard.
We laughed at the dog on the skateboard.
Answer:
the dog barked is the answer
What is the result of cellular respiration? (A) Energy for cell processes is released. (B) Oxygen is released for photosynthesis. (C) Cells undergo decomposition. (D) Nutrients are excreted to prevent the buildup of body fat.
Answer:
A Energy for cell processes is released
Why krypton and noble gas are not used in airships using the periodic table?
Answer:
Since the noble gases are unreactive or inert, they are safe to use. Helium is used to fill balloons and airships, because it is much lighter that air and it will not catch fire. Neon is used in advertising signs. It will give red glow, but the color can be changes by mixing it with other gases.
Explanation:
SHOW WORK
How many drops are in a 2-L bottle of Pepsi?
Answer:
The number of drops depends upon the size of the drops. So, basically, 1 ml has a drops of 20
so 2000 mo will have a 40k drops
How would decreasing the pressure affect the equilibrium of this reaction? Hat 12 32H1 O A. The reaction would remain in equilibrium B. HI would react to produce more H2 and 12 more quickly. O C. H2 and 12 would react to produce HI more quickly. D. All of the molecules would react more slowly.
A. The reaction would remain in equilibrium
Further explanationGiven
Reaction
H₂ + I₂ ⇔ 2HI
Required
the effect of pressure changes
Solution
In the equilibrium system :
Reaction = - action
⇒shift the reaction to the right or left.
The pressure usually affects the gas equilibrium system(only count the number of moles of gases)
The addition of pressure, the reaction will shift towards a smaller reaction coefficient ((the fewest moles of gas )
Reaction
H₂ + I₂ ⇔ 2HI
The reactant side of the equation has 2 moles of a gas(1 mole H₂ and 1 mole I₂) ; the product side has 2 moles HI
So the total number of moles from both sides is the same(2 moles) so that the change in volume (pressure) does not change the direction of equilibrium⇒No shift will occur
Answer:
A. The reaction would remain in equilibrium
Explanation:
what is amphoteric oxide please also give eg
Answer:
An amphoteric oxide is an oxide that can act as either an acid or base in a reaction to produce a salt and water. Amphoterism depends on the oxidation states available to a chemical species. Because metals have multiple oxidation states, they form amphoteric oxides and hydroxides.Many metals (such as zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide. Amphoteric oxides also include Lead (II) oxide, and zinc (II) oxide, among many others.[2]
Explanation:
hope this will help you
Answer:
Amphoteric oxides react with both acids and alkalis to form salt and water. Examples of amphoteric oxides are zinc oxide and aluminium oxide.
Explanation:
hope it helps....
While watching tv in your room one nigh, you decide to have some Oreos and a glass of milk. there were only 3 Oreos and science you pored a huge glass of milk you couldn't finish it all. Instead of taking it to the kitchen, you put the glass of milk under your bed. Your mom discovered it three months later when she was cleaning your room. The cup no longer had a white liquid...it now contained a semi-solid layer of cheese like stuff floating on top of a clear liquid. Did a chemical reaction take place, yes or no? what evidence or lack of evidence do you have to support your answer?
Answer:
yes it did.
Explanation:
the product must have produced a smell therefore it created a gas. this means it was a chemical reaction
PLEASE HELP this is due today the picture is below
Answer:
Explanation:
Ok so the first one would be Electrical energy and Radiated energy
Then the 2 question it would be not electrical but the other 3 for the 3 question it would be it would be Electrical and the radiated energy
And for the last one it would be the last 3