Answer:
The volume of an object can be calculated by multiplying its length, width and height. Further, depending on the shape of the object, its volume changes.
Explanation:
Hope this helps
All of the following affect toxicity of a substance except*
origin of the substance
nature of exposure
duration
dosage
Answer:
durage
Explanation:
durage just doesn't make sense compared to the other 3
Answer:
Origin of the substance
Explanation:
Origin of a substance doesnt affect toxicity but all other options do
If the number of neutrons in the nucleus of the atom is 41, and the atomic number is 40, what is the mass number of that atom
If the number of neutrons in the nucleus of the atom is 41, and the atomic number is 40, the mass number of that atom will be 81
What is mass number?Mass number is the sum of the number of protons which is the atomic number and neutrons of an atom.
It is represented using the letter ‘A.’
How to calculate the mass numberMass number = atomic number + neutrons
We have the atomic number as 40 and the number of neutrons as 41
The mass number = 40 + 41 = 81
Therefore, the mass number of the atom will be 81
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How many molecules are in 8.27 mol of SiH,?
Answer:
from,
moles,n = number of particles, N
Avogadro constant
N = 8.27 * 6.022×10^23
N = 4.98 × 10^ 24particles.
In 8.27 moles of SiH, there are
4.98 × 10^24particles.
In this experiment you are directed to add a limited amount of NaOH (aq) and then an excess amount. A similar strategy will be used with the addition of NH3(aq). Why? Group of answer choices Both NaOH and NH3 are weak bases. Both NaOH and NH3 are strong bases. Initially a metal hydroxide may form which becomes soluble when more base is added and the metal complex forms. Insoluble metal complexes are first formed which then are replaced by insoluble metal hydroxide precipitates. Initially a complex ion may form which becomes insoluble when more base is added and the metal hydroxide precipitate forms.
The reason for adding a limited amount and then an excess amount is that initially a metal hydroxide may form which becomes soluble when more base is added and the metal complex forms.
In qualitative analysis is a common to add the base in drops and then in excess. When added in drops, the metal hydroxide is formed. This metal hydroxide is often insoluble.
After this metal hydroxide is formed, the base could be added in excess such that the metal hydroxide dissolves in the excess base by forming a complex.
For instance;
CuCl2(aq) + 2NaOH(aq) -------> Cu(OH)2(s) + 2NaCl(aq)
Cu(OH)2(s) + 2OH^-(aq) -------> [Cu(OH)4]^2+(aq)
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What does the phrase “breaking in” mean as it is used in the passage?
A.
In the first instance, it means "to make something come apart," and in the second instance, it means "to stop doing something."
B.
In the first instance, it means "to enter without permission," and in the second instance, it means "to make softer through use."
C.
In the first instance, it means "to stop doing something," and in the second instance, it means "to make something come apart."
D.
In the first instance, it means "to make softer through use," and in the second instance, it means "to enter without permission."
Answer:
D
Explanation:
It means entry by force.
5. The density of a gas is lower than the density of a liquid because:
a. gas atoms are smaller than liquid atoms.
b. gas atoms are larger than liquid atoms
c. atoms in a gas are farther apart than atoms in a liquid.
d. atoms in a gas are closer together than atoms in a liquid
Answer:
c
Explanation:
the gas is further apart and the liquid is closer together
22.2 g of LiCiO4:3H2O in 125 mL of solution
Express your answer in moles per liter to three significant figures.
What is the Molar Mass?
Answer:
Molarity: concentration measured by the number of moles of solute per liter of solution 3)
Explanation:
According to molar concentration, molarity of solution is 1.104 moles per liter and molar mass is 160.437 g/mole.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Molarity of solution is obtained as, 22.2/160.437×1/0.125=1.104 moles per liter.Molar mass of LiClO₄.3 H₂O is 160.437 g/mole.
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Butanoic acid + 2 propanol
Answer:
Butanoic acid and 2-propanol reacts to form isopropyl butyrate.
Explanation:
brainliest plz
Which pair of compounds has the same empirical formula? C_{3}*H_{8} and C_{3}*H. C_{2}*H_{2} and C_{2}*H C_{4}*H_{10} and C_{6}*H C_{4}*H_{10} and C_{2}*H_{5}
Considering the definition of empirical and molecular formula, the pair of compounds C₄H₁₀ and C₂H₅ has the same empirical formula.
The empirical formula is the simplest expression to represent a chemical compound and indicates the elements that are present and the minimum proportion in whole numbers that there are between their atoms. This formula is also known as the "minimum formula".
On the other side, the molecular formula is the chemical formula that indicates the number and type of different atoms present in the molecule. But unlike the chemical formula, it shows the actual number of atoms that make up a molecule.
In this case, you can observe that if you divide the amount of each element by 2 in compound C₄H₁₀, you get C₂H₅, which is the empirical formula of the compound.
Finally, the pair of compounds C₄H₁₀ and C₂H₅ has the same empirical formula.
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https://brainly.com/question/6960643What is the atomic mass of Helium
Answer:
4.002602 u
Explanation
Answer:
4.002602 u
Explanation:
If the atomic mass of an atom is 16 and its atomic number is 7. how many
neutrons does it have?
Answer:
8
Explanation:
HELPPPPPPPP i need help!!!!!!!!!!!!!
Answer:
C!
Explanation:
when water is boiling the water particles will give each other more space and will then be turned into a gas :)
Elements in the alkaline earth metal family of the periodic table
have
electronegativity values than elements in the
halogen family of the periodic table.
Answer:Lower
Explanation:
( just had the question on ck12.)
Elements in the alkaline earth metal family of the periodic table have lower electronegativity values than elements in the halogen family of the periodic table as they have less electrons in their valence shell.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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What is the density of a gas with a volume of 5.6 FL oz. and a mass of 37 grams?
Answer:
6.60
Explanation:
What is difinition of chemistry
Please solve this question
Answer:
what question?
Explanation:
Please explain this and give answers
Answer:
a) 2Ba + O2 → 2BaO
b) 2HCl + Mg → MgCl2 + H2
c) 2HCl + CuO → CuCl2 + H2O
d) Fe + O2 → Fe2O3
Explanation:
Okay so for
a), you must add 2 at the front of Ba and BaO bcuz you're gonna need your equation balanced.
like as you can see, O has 2 so yeahh, you've got to balance it nicely.
b) you must add 2 in front of HCl bcuz the Cl and H after the reaction happened has 2 in them, were talking about balancing so XD
c) and yes again, you're gonna have to add 2 in front of HCl bcuz of the same reason as b).
d) D is definitely a special case bcuz, Fe3+ with O2, so well if you do the cross multiplication technique you'll automatically get Fe2O3. Yas that's it.
English is not my first language so it's hella tuff to explain it to you from in much more detailed perspective T-T Sorry (´∩｡• ᵕ •｡∩`)
What is the chemical formula for iron(11) oxide
Answer:
FeO
Explanation:
Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite. One of several iron oxides, it is a black-colored powder that is sometimes confused with rust, the latter of which consists of hydrated iron(III) oxide (ferric oxide).
how to do this question ? can anyone help me urgent
Answer:
7.50 and 50L
35atm
6.2atm
Models are used to predict behaviors in the real world.
True
False
Question 4 of 5
A specific oxygen atom has 8 protons and 10 neutrons. If this is a neutral
atom, how many electrons does the atom have?
A. 8
B. 6
C. 4
D. 9
SUBMIT
Answer:
A. 8
Explanation:
For this to be a neutral atom there has to be the same amount of protons and neutrons.
brainliest please. . .
which of the materials above are mixtures
Answer:
Even though i cannot see the image, In chemistry, a mixture is a material made up of two or more different chemical substance/substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Explanation:
Multiple choice (ASAP!)
Answer:
c
Explanation:
oxygen is lost electrons are added in oxidation state is decreased
Answer:
the correct answer is C
hope this helps <3
PLZ ANSWER ASAP CHEMISTRY LAB REPORT
I am doing an investigation where I simply throw a piece of paper that has been lit on fire, into a glass bottle/jar, and then throwing a hard boiled egg in the jar. Asides the outcome, equations, or whatnot with all that Chemistry stuff, I want to know:
What is the constant and what is variable?
*Thank you to anybody whom can answer, but please, please, please, give me the right answers. These labs are worst the most of my grade and I already have a D- in Chemistry.
Answer:
welp to bad got nothing for you ezcecect good luck bye btw its always the one you think its not
Explanation:
dugg
1. The average temperature in Addis Ababa, during the summer, is about 25°C. What is the equivalent Kelvin temperature?
Answer:
25 + 273= 298k.
Explanation:
I guess it's correct answer
The equivalent Kelvin temperature is 298 K.
What is temperature?Temperature is defined as a measurement of an object's or substance's warmth or coolness in relation to a standard value.
It can also defined as the feature of matter that represents the amount of energy of motion of its constituent components.
Temperature scale is defined as a method of indicating or measuring temperature with respect to a beginning point (0 or zero) and a unit of measurement.
Temperature scale is also defined as a way of calibrating the physical quantity temperature in metrology.
Usually there is three types of temperature scale is used.
Celsius scaleKelvin scaleFahrenheit scaleThus, the equivalent Kelvin temperature is 298 K.
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In which species does sulphur have the more negative oxidation number? Answers: A. H2S B. S8 (elemental form of sulphur) C. H2SO3 D. K2SO4
Answer:
H2S
Explanation:
the oxidation number of S is -2.
What is the lead concentration of a saturated solution of lead(II) sulfate containing 0.020 M Na2SO4? Ksp for PbSO4 = 6.3x10-7.
Answer:
i want to help but i d k. the answer :( sorry i couldnt help
Explanation:
What happens when the two atoms get even closer?
Answer:
If two atoms get close together then the electrons of each atom will get attracted to the other one and bc one atom lose electrons gets a positive charge and the one with more electrones will get a negetive charge
Explanation:
brailiest pls pls pls
What method would you use to separate sand from gasoline?
Answer:
Filtration (The process of separating liquids and solids)
Explanation:
Filtration works best when the solute isn't dissolved in the solvent. Basically like how you can filter dirt or sand from water. The opposite of this would be if water and sugar where mixed together you cannot unmix this duo with filtration but with the example given you can use the process of filtration to rid the gasoline of sand.
Determine the number of moles in 3.13 × 10²³ formula units of MgCl₂.
Answer:
0.52 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.13 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.13}{6.02} \\ = 0.519933[/tex]
We have the final answer as
0.52 molesHope this helps you