Answer:
1.896 moles of NaOH-----> 1.90 moles
Explanation:
Written- out Method:75.89 g of NaOH | 1 mole of NaOH
| 40.01 g NaOH = 1.896 -----> 1.90 moles of NaOH
Plug into calculator method:(75.89 g NaOH/ 40.01 g NaOH = 1.896 -----> 1.90 moles of NaOH
A chemist must prepare of aqueous copper(II) sulfate working solution. He'll do this by pouring out some aqueous copper(II) sulfate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in of the copper(II) sulfate stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.
Answer:
380 mL
Explanation:
A chemist must prepare 925 mL of 325 mM aqueous copper(II) sulfate working solution. He'll do this by pouring out some 0.792 M aqueous copper(II) sulfate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the copper(II) sulfate stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.
Step 1: Given data
Initial concentration (C₁): 0.792 MInitial volume (V₁): ?Final concentration (C₂): 325 mMFinal volume (V₂): 925 mLStep 2: Convert "C₂" to M
We will use the conversion factor 1 M = 1000 mM.
325 mM × (1 M/1000 mM) = 0.325 M
Step 3: Calculate the inital volume
We will use the dilution rule.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂/C₁
V₁ = 0.325 M × 925 mL/0.792 M
V₁ = 380 mL
What do you call an idea or explanation that you test through study and experimentation?
Can somebody please help me with this ASAP!
It's how many atoms are in two water molecules (H2O)?
Answer:
The chemical formula for water is H2O which means that every molecule of water has 2 atoms of hydrogen (H) and one atom of oxygen (O). Here comes the key part. From the Periodic Table of Elements, one sees that one mole of hydrogen atoms weighs 1 gram while one mole of oxygen atoms weighs 16 grams.
Explanation:
:)
The number of atoms present in two water molecules is 6 atoms. 4 hydrogen atoms and 2 oxygen atoms.
What are atoms?Atoms are the basic unit of a substance. An atom is made of a nucleus, protons, neutrons and electrons. Different atoms combines to form a molecule and molecules combines to form compounds.
Water has the formulas H₂O, thus one molecule of water contains 2 hydrogen and one oxygen. Therefore, two molecules of water that is (H₂O)₂ have 4 hydrogen and 2 oxygens thus, a total of 6 atoms.
Hence, the number of atoms present in two molecules of water is 6.
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Answer:
9.32×10⁻³
Explanation:
Scientific notation is the way to express the large value in short form.
The number in scientific notation have two parts.
. The digits (decimal point will place after first digit)
× 10 ( the power which put the decimal point where it should be)
How to add the number in scientific notation with same exponent.
7.21 ×10⁻³ + 2.11 ×10⁻³
exponent of both values are same thus we will take it common.
[7.21 + 2.11 ]×10⁻³
9.32×10⁻³
A neutral atom of an element has three energy levels and two valence electrons. Which element in the periodic table does this describe?
Answer:
I think it is Lithium...
Explanation:
⚠️⚠️ period and group PLEAAE CHECK OUT THE QUESTIONNS IMAGE ⚠️⚠️
Answer:
group 5, period 7
pls help me with this question
Answer:
I think its a and c
Explanation:
im smrt
WILL GIVE 5 STAR RATING AND BRAINLIEST IF YOU ANSWER FIRST AND CORRECTLY
What are the total number of elements in C₄H₉OH ?
I NEED HELP ASAP!!
Scientific Inquiry
Science is the investigation of the ______________ ________________. Biology is the branch of science that studies ___________ _______________ and the environments they live in.
The Scientific Method
The scientific method is a __________________ used during a scientific ____________________ to answer a scientific question.
• Qualitative data is something that can’t be
________________ but can change over time.
Scientific inquiry can’t answer questions about a person’s beliefs, ethics, _________________, and feelings.
Which of these are questions that science can answer?
A. Was the flu vaccine more effective this year than last year?
B. Is it ethical to use stem cells in human research?
C. Does a drop in temperature affect the number of offspring that frogs produce?
D. Will people feel better if they eat organic produce instead of conventionally grown produce?
E. Are coffee drinkers worried about their heart disease risk?
Construct Hypotheses and Predictions
A hypothesis is a plausible __________________ for a particular fact. The hypothesis needs to be ____________________ or ____________________ based on collected evidence. All studies must have at least one hypothesis.
Answer:
Science is the investigation of the ______________ ________________. Biology is the branch of science that studies living organisms and the environments they live in.
The scientific method is a tool used during a scientific investigation to answer a scientific question.
• Qualitative data is something that can’t be
collected but can change over time.
Scientific inquiry can’t answer questions about a person’s beliefs, ethics, values, and feelings.
im going to say d
Construct Hypotheses and Predictions
A hypothesis is a plausible guess for a particular fact. The hypothesis needs to be supported or refuted (proven wrong) based on collected evidence. All studies must have at least one hypothesis.
What do we call the (+) ion in an ionic bond? *
O Cation
O Anion
O Metalloid
O Covalent
Answer:
cation
Explanation:
a cation is an ion with a postitive charge. This (cat)ion (+) = cats are good , anion (onion) are not good (-)
Which are examples of harmful mutations? Check all that apply. One that causes a person to have a light patch of hair color one that changes a mouse's eye shape but not its eyesight O one that allows a moth to blend into its environment one that reduces a bean plant's ability to make food one that increases the plants susceptibility to disease
Answer:
one that reduces a bean plant's ability to make food
one that increases the plants susceptibility to disease
Explanation:
Genetic mutation refers to the changes in the arrangement of the bases that make up a gene. This sudden change may have positive or negative consequences for the individual specie.
Some genetic mutations actually alter a gene's sequence of bases but do not alter the function of the particular protein that the gene in question makes.
The two options chosen in the answer shows situations in which a genetic mutation causes harm to the organism involved.
Answer:
2, 4, and 5
Explanation:
PLS HELP!! ASAP!! 10 POINTS!!
From Dalton's atomic theory, a few parts were disproven over the course of years of experiments. Which part was modified by the discovery of subatomic particles?
That matter is made of atoms.
If the same elements are in a two different compounds, their ratio will always be the smallest whole number ratio for that compound.
That atoms cannot be divided.
That all atoms of an element are exactly the same
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. ... According to Dalton, the atoms of same element are similar in all respects. However, atoms of some elements vary in their masses and densities. These atoms of different masses are called isotopes.
Different microscopic organisms cause different
diseases. When a dangerous microscopic organismis
transferred from one person to many people the
disease it cames will spread
Why is this considered a theory instead of a hypothesis
or a law?
Answer/Explanation:
A theory has lots of scientific evidence to back it up. We know this to be true based on lots of different diseases and studies of their spread.
A hypothesis is more of a starting point - an educated guess based on limited evidence. It requires further testing before becoming a theory.
A law is something that can be generalized to lots of contexts, and is universal. Such as the law of thermodynamics.
Is carbon dioxide a polar molecule? Why or Why Not?
Explanation:
Carbon dioxide isn't a polar molecule because
same nature of charge appears in opposite direction which cancel each other. So, carbon dioxide is non-polar molecule.
after the nutrients are extracted, where does the food go, waiting to be expelled?
Answer:
Nutrients advance through the alimentary canal to the stomach and small intestine, and waste materials continue from the small intestine to the colon (large intestine) and anus.
Explanation:
Match each description below with the name of the local wind system being described. warm, dry downslope wind affecting Southern California monsoon wind blowing from a valley up a mountain slope valley breeze a seasonally changing wind Santa Ana wind generated by cold thunderstorm downdrafts haboob
Answer:
warm, dry downslope wind affecting Southern California - Santa Ana wind
a seasonally changing wind- monsoon
wind blowing from a valley up a mountain slope - valley breeze
generated by cold thunderstorm downdrafts - haboob
Explanation:
The Santa Ana wind occurs in early autumn. They bring hot and dry weather to areas around the South-West coast. They move at high speeds, affecting most parts of Southern California.
Monsoon is a seasonal wind that blows across Southern Asia. It usually blows in summer. It is a a seasonally changing wind.
Valley breeze is an example of convection current in nature. It is produced by rapid warming of the valley floor leading to the expansion of air making it to flow up the slopes. At night, radiation from the surface cools the slopes. This leads to the rise of cooler and denser air which drains into the valley.
Haboob is generated by cold thunderstorm downdrafts. It is associated with large sandstorms and dust storms.
Select the correct answer from each drop-down menu.
Why do some transition metals have multiple oxidation states?
Transition metals have multiple oxidation states because of their (a. completely filled b. partially filled c. empty) (s, p, d, or f) sublevel.
Answer:
because of energy difference between (n1)d and ns orbitals (sub levels) and involvement of both orbital in bond formation
Explaination:
the reason is that there is a difference in energy of orbitals of an atom of transition metal, so there (n1)d orbitals and there ns orbitals both make a bond and for this purpose they lose an electron that is why both sublevels shows different oxidation state.
Hope this helped you
Transition metals have multiple oxidation states because of their partially filled orbitals . Thus option b is correct.
What are transition metals?Transition metals are defined as essentially, a configuration attended by reactants during complex formation, as well as the reaction coordinates.
It can also be defined as a very short-lived atomic configuration at a reaction-energy diagram's local energy maximum.
Transition metals are best defined as an element with a partially filled d sub-shell on its atom or that can give rise to cations with an incomplete d sub-shell.
Transition state is defined as a chemical reaction is defined as a certain configuration along the reaction coordinate.
Oxidation state is defined as the total number of electrons that have been deleted or added to an element.
It can also be defined as an atom's charge if all of its links to other atoms were entirely ionic.
Thus, transition metals have multiple oxidation states because of their partially filled orbitals . Thus option b is correct.
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experimented with oil and water layers in 1917. He proposed that the
in the oils pointed away from the water
• A. Charles Overton, phosphate heads
. B. Irving Langmuir, fatty acid chains
• C. Hugh Davson, proteins
. D. Gregor Mendel, fatty acid chains
Answer:
Irving Langmuir, Fatty Acid Chains
Explanation:
The man that experimented with oil and water layers in 1917 and also proposed that the ________ in the oils pointed away from the water is:
B. Irving Langmuir, fatty acid chainsIrving Langmuir was an American scientist who was interested in the fields of Chemistry, Physics and Engineering. He won an award in Chemistry for his contributory research in surface chemistry.
He made an experiment with oil and water layers in the year 1917 and he made the claim that the fatty acid chains in oils always pointed away from tje water in which they were immersed in.
Therefore, the correct answer is option B
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1. Calculate the number of moles in each of the following masses:
a. 64.1 g of aluminum ans: 2.38 mol Al show work
Answer:
2.38 mol of Al
Explanation:
To find the number of moles in a substance, you simply divide by the atomic mass. In this case, the conversion table would look as follows:
[tex]\frac{64.1 g}{1}[/tex] * [tex]\frac{1 mol}{26.98 g}[/tex]
The gram units cancel, and you are left with the answer of about 2.38 moles of Aluminum.
If we know the force of an object in Newtons) and we know how fast the object accelerates in ms"), then we can easily find the mass of the object by
dividing the _ by the _
Answer:
If we know the force of an object in Newtons) and we know how fast the object accelerates in ms"), then we can easily find the mass of the object by
dividing the force by the mass
Which is a base unit used in the metric system?
Answer:
Quarts Litres Pints Degrees Fahrenheit.ASK for more
Answer:
d
Explanation:
which process do ribosomes perform
what would you expect to see if a piece of copper metal is placed in a solution that contains nickel(II) ions?
A. copper atoms become copper(II) ions
b. nickel ions become solid nickel
c. no reaction happens
d. a precipitate forms that contains copper and nickel ions
Answer:
c. no reaction happens
Explanation:
Let me take your mind back to the idea of electrode potentials of metals. Remember that the more negative the electrode potential of a metal, the more reducing the metal is. Metals with more negative electrode potentials displace metals with less negative electrode potentials from their aqueous solutions.
The electrode potential of nickel is -0.25 V while that of copper is +0.34 V. Hence, copper is lower than nickel in the activity series and can not displace it from aqueous solution.
This implies that, if a piece of copper metal is placed in a solution that contains nickel(II) ions, no reaction happens .
I will give you brainliest
Answer:
Plumbing System
Explanation:
Answer:
C plumbing system
Explanation:
Infrastructure is the basic structures needed for the operation of society
Ninety percent of plastic is made from the same stuff used to
manufacture:
Answer:
Polyethylene terephthalateHope this helps you Do mark as brainliest ✌️Crystallisation is a separation technique used to separate____ solids from a liquid solvent.
Answer:
separate soluble solids from liquid
Explanation:
A in Chemistry
Crystallization is a separation technique used to separate solute solids from a liquid solvent.
What is Crystallization?Crystallization is the process of disuniting or separating two substances or molecules that are mixed, and are of different forms of matter. Such as solid and liquid. The process separates mixtures by three processes. These processes are freezing, precipitation, and deposition.
It is the main process of separating solid from liquid. In this process, the solute came above the liquid in crystal form and this is called precipitation.
Freezing separates the substance that has a different freezing point. By deposition, the substance that is solid and called solute is deposited below the liquid in the container.
Thus, crystallization separates the solute solids from a liquid solvent.
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Repeat this calculation using Slater's rules to estimate the screening constant, S, and calculate Zeff for these two ions. Express your answers using two decimal places. Enter your answers numerically separated by a comma. 50 A 6 A 0 21 ? S. Zeff C, Zeff K+ =
Answer:
Cl^- = 5.75
K^+ = 7.75
Explanation:
Now let us calculate the effective nuclear charge four K^+ and Cl^- from Slater's rule.
Given that Cl^- and K^+ has electronic configuration of; [Ne] 3s2 3p6 (they are isoelectronic species)
We compute S as follows;
For n - 2 level, S= 1
For n - 1 level, S= 0.85
For ns,np level S= 0.35
Note: S= screening or shielding constant
1s2, S=2 ×1 = 2
2s2 2p6, S= 8×0.85 = 6.8
3s2 3p6, S= 7 × 0.35 = 2.45
The electron under study is not considered hence seven out of eight electrons in the shell are considered
Hence
S= 2 + 6.8 + 2.45 = 11.25
Since Cl^- has 17 electrons;
Zeff(Cl^-) = 17 - 11.25 = 5.75
For K^+
Zeff = 19 - 11.25 = 7.75
what is action force?
Answer:
is force acting in one direction
Answer:
hope this helps!
as described by the third of Newton's law of motion of classical mechanics, offices occurs in pairs such that is one object exerts a force on another object, then the second object exerts an equal and opposite reaction Force on the first.
PLEASE HELP 30 POINTS
Because the rock is irregularly shaped, you used the displacement method to measure its volume.
You used (______) to indirectly find the (_____) of the objects.
Options for the 1st fill in the blank:
- a balance
- calculations
- a graduated cylinder
Options for the 2nd fill in the blank:
- density
- mass
- area
Answer:
balance for the 1st and mass for the 2nd