Answer:
Silver does have a mass of 107.87.
Explanation:
The storage method used for radioactive wastes generated from fission nuclear reactors must be designed to last for how long?
months
years
centuries
weeks
Answer: c
Explanation:
Answer: C - Centuries
Explanation:
A chemist dissolves 320.mg of pure nitric acid in enough water to make up 290.mL of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits.
Answer:
1.7
Explanation:
The formula to be used here is;
pH = -log[H⁺]
To determine the concentration of H⁺ of the nitric acid (HNO₃), formula for molarity is used
Molarity = number of moles/volume (in dm³ or L)
number of moles (n) = given mass/molar mass
Molar mass of HNO₃ = 1 + 14 + (16 x 3)
= 63g
given mass (in grams) = 320mg⇔0.32g (where 1000mg = 1g)
Thus; n = 0.32/63
n = 0.0051 moles
Volume of acid = 290 mL ⇔ 0.29 L (where 1000 mL = 1L)
Molarity = n/volume;
0.0051/0.29
Molarity = 0.018M
pH = -log 0.018
pH = 1.7
Which of the following cannot be read directly from the periodic table?
an element's atomic mass
an element's number of neutrons
an element's symbol
an element's number of protons
I have a question. Does anyone have a crush on their classmates? I do!
Answer:
I never had a crush on anyone
Explanation:
How can you use the periodic table to predict reactivity?
Giving Brainliest!!!
Answer:
hi
Explanation:
how r u today
Why is digestion an example of both physical and chemical change simultaneously
Answer: Here is why,
Explanation: Burning of wood is a example of both physical and chemical change. ... Another example is digestion of food ,first the food is chewed into small pieces this is a chemical change while in the actual digestion process it is chemically broken with the help of digestive enzymes and saliva
What is the frequency of a photon with an energy
Answer:
option b is correct option = (6.76×10¹⁴ Hz)
Explanation:
Given data:
Wavelength of photon = 4.42×10⁻⁷ m
Speed of light = 2.99×10⁸ m/s
Frequency of radiation = ?
Solution:
Formula:
Speed of wave = frequency × wavelength
Now we will rearrange this formula.
frequency = Speed of wave / wavelength
f = c/ λ
f = 2.99×10⁸ m/s / 4.42×10⁻⁷ m
f = 0.676×10¹⁵ Hz (s⁻¹ = Hz)
f = 6.76×10¹⁴ Hz
Thus option b is correct option.
What is inside a Atom?
Answer:
there are three different subatomic particles inside them: the protons, neutrons, and electrons
what’s the answer??
Answer:
7.0
Explanation:
P1V1=P2V2 if temperature and moles are constant, which they appear to be
3.5*2.5=1.25x
x=8.75/1.25
x=7
Which type of investigation is based on observation?
Answer:
Quantitative Observations
Explanation:
Q1. Why is Cl2 a nonpolar molecule, but HCl is a polar molecule? Explain your reasoning.
Answer:
\/\/
Explanation:
in CI2 the electron charge is identical on both atoms but on HCI electrons are shared unequally between the chlorine atoms and hydrogen atoms
PLEASE HELPPP!!!!!!!!
Explanation:
Label A: oceanic - oceanic
Label B: oceanic - continental
Label C: continental - continental
Answer:
Oceanic-continental convergence---- letter B.
Oceanic-oceanic convergence ---- letter A.
Continental-continental convergence ---- letter C
plz mark brainliest
"Why does a hamburger have fewer calories than a steak? Because it's in the ground state!" Explain the joke while also highlighting what the ground state means for electrons in a way that someone who has never taken chemistry before will understand.
Answer:
it means a hamburger has less calories bc its referring to steak that has been grounded and the highlight would be calories
the pH of a HClO4 solution was measured as 4.251. What would be the concentration of HClO4 in this solution
Answer:
[tex]0.000056[/tex]
Explanation:
If [tex]pH[/tex] is given then hydronium ion concentration is equal to [tex]-log[H_3O^+][/tex]
The hydronium ion concentration can be found from the pH using the following formula:
Hydronium ion concentration = [tex]10^{-pH}[/tex]
As the pH of a HClO4 solution was measured as 4.251,
put [tex]pH=4.251[/tex]
So,
Concentration of HClO4 in the solution = [tex]10^{-4.251}=0.000056[/tex]
What do you notice about the relationship between the force strength and the size of the velocity change? HELP MEEEEE
Velocity change increases as the force increases.
Even though this question is incomplete, but we can approach it from the stand point of Newton's second law of motion.
According to this law, force is directly proportional to change in velocity.
F = m(v - u)/t
F = force applied
m = mass of the body
v = final velocity of the body
u = initial velocity of the body
t = time taken
This means that velocity change increases as force increases.
Learn more: https://brainly.com/question/19860811
which statement is true about the atomic masses?
A: it is never greater than the atomic number.
B: it can be greater than the atomic number.
C: it always equals the atomic.
D: it is always lower than the atomic number.
it is never greater than the atomic number.
OR,
Atomic mass is greater than Atomic number.. so, Answer is A . If you like this answer then mark this answer as BRAINLIEST answer.Thank you ☺️☺️
Identifying Qualitative and quantitative Data
Sort the data collected about a colony of bacteria into qualitative or quantitative data.
spreads across plate
Qualitative Data
Qua
200 purple colonies total
circular in shape
stained purple
75 colonies did not stain purple
55 colonies grew at room temp
Answer:
qualitative data : quantitative data :
circular in shape 75 colonies ...
stained purple 200 purple ..
spreads across plate 55 colonies ...
Explanation:
i got it right :) .
Answer:
Same XD Have a bless day ^﹏^^O^^O^^O^
Explanation:
3) A certain reaction has the following general form: A + B à AB At a particular temperature the concentration versus time were collected for this reaction, and a plot of ln[A]t versus time resulted in a straight line with a slope of −3.7 x 10−3 s−1. Show your math! (5 points) a. What is the order of the reaction? b. What is the rate constant (including units)? c. Calculate the half-life for the reaction. d. If the initial concentration of A is 0.250 M, what is the concentration after 220 seconds?
Answer:
a. First order.
b. [tex]k=3.7x10^{-3}s ^{-1}[/tex]
c. [tex]t_{1/2}=187.3s[/tex]
d. [tex][A]=0.111M[/tex]
Explanation:
Hello.
a. In this case since the slope is in s⁻¹ we can infer that the lineal form of the rate law is:
[tex]ln[A]=-kt+ln[A]_0[/tex]
Which is also:
[tex]y=mx+b[/tex]
It means that the reaction is first-order as slope equals the negative of the rate constant which also has units of first-oder reaction.
b. Since the slope is −3.7 x 10−3 s−1 the rate constant is:
[tex]k=-m\\\\k=-(-3.7x10^{-3}s ^{-1})\\\\k=3.7x10^{-3}s ^{-1}[/tex]
c. For first-order reactions, the half-life is:
[tex]t_{1/2}=\frac{ln(2)}{k}\\ \\t_{1/2}=\frac{ln(2)}{3.7x10^{-3}s^{-1}}\\\\t_{1/2}=187.3s[/tex]
d. In this case, since the integrated first-order rate law is:
[tex][A]=[A]_0exp(-kt)[/tex]
The concentration once 220 seconds have passed is:
[tex][A]=0.250Mexp(-3.7x10^{-3}s^{-1}*220s)\\\\[/tex]
[tex][A]=0.111M[/tex]
Regards.
Do all variations help organisms survive
Answer:
Yes
Explanation:
Or maybe i dont really know what it mean
30 g of pineapple added to a drink the drink rises 5 ml what is the density of the pineapple
Answer:
Density of pineapple is 6 g/mL.
Explanation:
Given data:
Mass of pineapple = 30 g
Volume rises = 5 mL
Density of pineapple = ?
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
The volume rises by drink is actually the volume of pineapple.
d = 30 g/ 5 mL
d = 6 g/mL
Density of pineapple is 6 g/mL.
I’m not good at chemistry
Answer:
λ = 5.56 × 10⁻³ m
Explanation:
You have to use the formula c = λv to solve the problem. Review what you are given. You are given v and c, where v = 5.40 × 10¹⁰ Hz and c = 3.00 × 10⁸ m/s. The value c is for the speed of light and is something you need to memorize. You will use it often in physics and sometimes in chemistry.
Now that you figured out what you know, you can see that there is only one unknown, allowing you to solve.
c = λv
λ = c/v
λ = (3.00 × 10⁸ m/s)/(5.40 × 10¹⁰ Hz)
λ = 5.56 × 10⁻³ m
Calculate the number of hydrogen atoms in 41.4 g of
ethyl alcohol, C2H60.
Answer:
3.25 x 10²⁴ atoms of H
Explanation:
First you have to convert from grams to moles of C₂H₆O using the molar mass of C₂H₆O, which is 46.06 g/mol. Then convert from moles of C₂H₆O to moles of H using the ratio within the compound; for every molecule of C₂H₆O, there are 6 H atoms. Then lastly, because moles just represent a number in the same way a dozen does, we convert from moles of H to the number of atoms of H. 1 mole H = 6.022 x 10²³ atoms of H.
[tex]41.4g*\frac{1molC2H6O}{46.06C2H6O} * \frac{6 mol H}{1molC2H6O} * \frac{6.022 * 10^2^3atomsH}{1molH} = 3.2476 x 10^2^4atomsH[/tex]
Round to lowest number of significant figure which is three to get 3.25 x 10²⁴.
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The the total number of atoms of hydrogen atoms in 41.4 g of ethyl alcohol, C₂H₆0 is 5.35×10²³ atoms.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
Number of atoms =number of moles×6.022×10²³ (Avogadro number)
number of moles= given mass÷ Molar mass
Given mass=41.4 g
Molar mass of C₂H₆0=46.07 g/mol
number of moles= 41.4 g ÷ 46.07 g/mol=0.89mol
Number of atoms =0.89mol×6.022×10²³ (Avogadro number)
=5.35×10²³ atoms
Therefore, the total number of atoms of hydrogen atoms in 41.4 g of
ethyl alcohol, C₂H₆0 is 5.35×10²³ atoms.
To know more about atom, here:
https://brainly.com/question/13518322
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You have 100. grams of potassium bromide (KBr). How many moles do you have? (1 mole KBr = 119 g KBr)
0.840 mole KBr
1.00 mole KBr
1.19 mole KBr
2.00 mole KBr
Answer:
0.840
Explanation:
The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.
The moles can be defined as the mass of the compound with respect to the molecular mass. The moles can be given as:
Moles = [tex]\rm \dfrac{weight}{Molecular\;weight}[/tex]
The molecular weight has been the mass of the constituents of the atoms present in the compound.
The compound KBr has a molecular mass of 119 g/mol.
The given mass of the compound has been 100 grams.
The moles of KBr can be given as:
Moles of KBr = [tex]\rm \dfrac{100}{119}[/tex]
Moles of KBr = 0.84 moles.
The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.
For more information about the moles, refer to the link:
https://brainly.com/question/2437143
The difference between the two types of succession !!!??!?
Answer:
Hope it help you
Stayhomestaysafe
Plz mark my answer brainliest✍️✍️
Explanation:
Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes. Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat.
REAL NAME - SHRESTH DUBEY
Which characteristics describe the genetic code of humans? Select three options
Answer:
1. Can help in development of effective medications
2. Can help explain genetic diseases
3. Composed of about 19,000 genes
Explanation:
The other answer options are misleading.
Genetic code of humans can help with understanding more than just human genetics.
Human genetics is composed of 23 chromosome pairs, for a total of 46 chromosomes.
 what is 19.8-17.1
Answer: it should be 2.8
Explanation:
True or false, the nucleus is the core of an atom
Answer:true
Explanation:
The neutrons and the protons are what stay there
Which field is not a branch of biology
Botany
Geology
Zoology
Genetics
Answer:
Geology
Explanation:
Geology is not a branch of biology.
Biology is the study of all forms of lives. Bio - life and logy - study
It consists of studies of plants, animals and micro-organisms. Some of its sub-branches are zoology, botany, genetics, micro-biology e.t.c.
Geology is the study of the earth. It deals with the materials that makes up the earth and how they have evolved through time. some of its sub-disciplines are hydro-geology, stratigraphy, geochemistry e.t.cAnswer:
geology
Explanation: I took the test.
An object accelerates 12.0 m/s2 when a force of 6.0 newtons is applied to it. What is the mass of the object?
Answer:
The mass of object is 0.5 Kg.
Explanation:
Given data:
Acceleration of object = 12.0 m/s²
Force on object = 6.0 N
Mass of object = ?
Solution:
Formula:
F = m×a
F = force
m = mass
a = acceleration
Now we will put the values in formula.
6.0 N = m × 12.0 m/s²
m = 6.0 N / 12.0 m/s²
( N = kg.m/s²)
m = 0.5 kg
The mass of object is 0.5 Kg.
Element Rand Element Q have the same number of valence
electrons. These elements both have similar chemical behavior, but
Element R has fewer energy levels than Element Q. Which statement best
describes the positions of the two elements in the periodic table?
I know I'm answering super late, but I just want to help others who don't know the answer
Answer:
H. The two elements are in the same group, with Element R just above Element Q.
Explanation:
When answering a question like this, I would highly recommended using a periodic table. I used a periodic table to find the answer to the question.