Diamond has a density of 3.26 g/cm^3. What is the mass of a diamond that has a volume of 25 cm^3?
Answer:
81.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 25 × 3.26
We have the final answer as
81.5 gHope this helps you
Which of the following has no electrical charge?
Select one:
a. proton
b. neutron
c. electron
Answer:
neutron
Explanation
neutrons have no net charge
How many seconds in 16 years? (Ignore leap years). show work
Answer:
There are 504,576,000 seconds in 16 years.
Explanation:
To calculate the number of seconds in 16 years, let's first use simpler units since we are going to be working with large numbers.
First, calculate the number of seconds in one day (24 hours). We can do this with the common knowledge that there are 60 seconds in a minute, and 60 minutes in an hour, multiply the seconds and minutes:
[tex]60*60=3600[/tex]
Therefore, there are 3600 seconds in an hour. Since we know that there are 24 hours in a day, we can multiply the seconds by hours:
[tex]3600*24=86400[/tex]
Therefore, there are 86,400 seconds in a day.
Knowing that there are 365 days in a year, we can multiply 86,400 seconds by 365 days to calculate the number of seconds in a year:
[tex]86400*365=31536000[/tex]
Therefore, there are 31,536,000 seconds in a year.
Since the question is asking the number of seconds in 16 years, we can simply multiply 31,536,000 seconds by 16 years:
[tex]31536000*16=504576000[/tex]
Therefore, there are 504,576,000 seconds in 16 years.
How many formula units are there in 50.3 moles potassium chloride?
3.03 × 10²⁵ formula units KCl
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Unit 0
Reading a Periodic TableWriting CompoundsAtomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
50.3 mol KCl (Potassium chloride)
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]\displaystyle 50.3 \ mol \ KCl(\frac{6.022 \cdot 10^{23} \ formula \ units \ KCl}{1 \ mol \ KCl} )[/tex] = 3.02907 × 10²⁵ formula units KCl
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
3.02907 × 10²⁵ formula units KCl ≈ 3.03 × 10²⁵ formula units KCl
A cook places a pan of food on a hot stove and leaves it there. When the food is just about done cooking, which of the following will most likely be true?
A.
The pan will be hotter than the stove.
B.
The pan will not have changed in temperature.
C.
The pan will be the same temperature as the stove.
D.
The pan will be cooler than the stove.
Answer:
C.
The pan will be the same temperature as the stove.
Explanation:
“First, I would want to find the fire’s origin and look for signs of accelerant use. If I was able to locate the origin, I would do my best to preserve the area. If not, …” Your ‘timeline’ should be detailed but it does not need to be as extensive as a research paper or essay. You can format your timeline however you like – as an actual timeline, a bulleted list, or short paragraphs as long as you include a clear format like first, second, third, etc. Be sure to include at least six steps. You can create your ‘timeline’ in a word processing program or a slide presentation. You will be graded on the accuracy of your timeline as well as mechanics and grammar. For more details, see the rubric below
Answer:
1. First, I would observe the fire and the conditions of the scene, looking for the origin of the fire and looking in an accelerant was used. If I could find the origin of the fire I would make sure to not have any evidence damaged, and if I could not find the origin of would look from other forms of evidence, like clothing, flammable liquids, or igniters.
2. Secondly, I would make sure to preserve the area, and document the scene, with pictures and notes and any other forms of recording. It is important to initiate permanent documenting of the scene.
3. Thirdly, I would try to find anything flammable with a snider, and run the tests on what it could be. It is also important to make sure everybody is safe, and to evaluate for any safety hazards. Finally, I would create safety zones and communicate the hazards to people near the scene.
4. I would next contact the incident commander, and also search for any evidence that says whether the fire was an accident or was arson. If the fire was arson, I would locate any evidence that could lead to suspects, and if the fire was an accident, I would try to find all the evidence that shows how it happened.
5. Once I collect all the evidence, I would organize it in the best way possible and then I would use the hydrocarbon method in order to test the evidence that I found.
6. After the results come back based on the evidence, I would compare the results with the information found about the fire security in the building, the people involved, and I would start in trying to solve the crime.
Describe what is happening when an object is in equilibrium ?
Answer:
in terms of chemistry, the forward reaction balances the backward reaction :)
Explanation:
What is the medium of the wave shown in the paragraph?
Answer:
The water is the medium of the wave
Give the hybridization for the O in H3O+
Answer: It would be Sp2, because H3O+ has planar structure.
2. Look at the chemical formula of a compound below. Use the periodic table to
answer the following question.
NH4
Which elements are found in this compound? (6.5A)
F. Nitrogen and Hydrogen
G. Nitrogen and Helium
H. Nickel and Hydrogen
J. Nickel and Helium
HELP ASAP MY LESSON IS BEING TIMED!!!
1) Choose the correct answer.
_____ states when one object applies a force on a second object, the second object applies an equal force in the opposite direction.
Newton’s third law of motion
The law of conservation of momentum
The law of conservation of energy
2) Choose the correct answer.
The law of conservation of momentum states that the total movement of a group of objects stays the same unless acted on by _____ forces.
unbalanced
balanced
opposite
3) Choose the correct answer.
Forces work in pairs; the _____ force is the initial force applied to an object.
momentum
action
reaction
Answer:
1. Newton's third law of motion
2. Unbalanced
3. Action
How many molecules of oxygen are produced when a sample of 38.9 g of water is decomposed by electricity?
A) 6.5 x 10^23
B) 1.3 x 10^24
C) 2.6 x 10^24
D) 2.3 x 10^25
Answer:
A) [tex]6.5\times 10^{23}\ \text{molecules}[/tex]
Explanation:
m = Mass of water = 38.9
M = Molar mass of water = 18 g/mol
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
The reaction of electrolysis would be
[tex]2H_2O(l)\rightarrow 2H_2(g)+O_2(g)[/tex]
Number of moles of [tex]H_2O[/tex]
[tex]n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{38.9}{18}\ \text{mol}[/tex]
From the reaction it can be seen that 2 moles of [tex]H_2O[/tex] gives 1 mole of [tex]O_2[/tex]
So, number of moles of [tex]O_2[/tex] produced is
[tex]\dfrac{38.9}{18}\times \dfrac{1}{2}=1.081\ \text{mol}[/tex]
Number of molecules
[tex]1.081N_A=1.081\times 6.022\times 10^{23}\\ =6.5\times 10^{23}[/tex]
So, [tex]6.5\times 10^{23}\ \text{molecules}[/tex] of oxygen is produced.
How does the smell of food being cooked spread so fast ???
Answer:
When we cook food in the kitchen, that's the region of higher concentration of the smell. By diffusion, the smell spreads to the whole room and thereby whole house, so anyone standing at a distance, can smell it.
Answer:
smell of cooked food spread fast bc when something is heated up, the kinetic energy of the molecules/particles increases and some of them even mix with the air and moves around. the first answer is also correct (i just explained it more detaily)
so, this is the reason :)
mark as brainliest dagini ;)
what element is found on the left side of the periodic table
Answer:
Mostly Metals, But hydrogen is the only one that isn't.
how does a window demonstrate transmittance of light
Answer:
The proportion of light transmitted by glazing is specified by the Visible Light Transmittance, which is recorded as either TVw (visible transmittance of the window) or VLT (visible light transmittance). These terms are interchangeable, but in Australia, the Window Energy Rating Scheme uses Tvw in its ratings.
While the VLT/Tvw rating varies between 0 and 1, most double glazed windows rate between 0.3 and 0.7 , which means that between 30% and 70% of the available light passes through the window. The illustration above shows you how the view changes, as the amount of light getting through the window changes.
Explanation:
When the equation H₂ + N₂ --->NH₃ is completely balanced using the smallest whole numbers, the sum of all the coefficients will be
Answer:
6
Explanation:
The equation given in this question is:
H₂ + N₂ ---> NH₃
To balance this equation i.e to make sure that the number of atoms on each side of the equation is the same, one would make use of coefficients.
The balanced equation is:
3H₂ + N₂ ---> 2NH₃
The coefficients are the number behind each element or molecule. According to this question, the sum of each coefficient is 3 + 1 + 2 = 6
What types of radiation cause the parent isotope to change into a different element?
Answer:
Beta decay is most common in elements with a high neutron to proton ratio. Gamma decay follows the form: In gamma emission, neither the atomic number or the mass number is changed. A high energy gamma ray is given off when the parent isotope falls into a lower energy state.
Explanation:
pls mark me as brainliest
The atoms in NaOH are:
Sodium, oxygen, and hydrogen
Naquida, oxygen, and hydrogen
Naoline and Oxyhydrous
Nitrogen, Argon, Oxygen, and Hydrogen
Answer:
Sodium, Oxygen and Hydrogen
Explanation:
Na= Sodium
O= Oxygen
H= Hydrogen
what would happen to the volume of 10L carbon dioxide, if the pressure is doubled and temperature is constant?
Answer:
The volume will goes to decrease.
Explanation:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
when pressure is going to increase the volume will goes to decrease and vice versa.
Consider the initial volume is 10 L at initial pressure of 15 atm when pressure is increased to 30 atm the volume will be,
Now we will put the values in formula,
P₁V₁ = P₂V₂
15 atm × 10 L = 30 atm × V₂
V₂ = 150 atm. L/ 30 atm
V₂ = 5 L
two answer multiple choice-- please help!
Study the reaction.
NH4+ + NO2– ⟶ N2 + 2H2O
The rate of this reaction is proportional to the concentration of ammonium (NH4+) and the concentration of nitrogen dioxide (NO2–).
What is the rate law of this reaction?
Rate = K[NH4+][NO2–]
Rate = K[N2][H2O] ^2
Answer:
Rate = K[NH₄⁺][NO₂⁻]
Explanation:
In kinetics studies of reaction, rate law is a mathematical expression that relates speed of reaction with concentrations of the reactants. For a reaction:
aA + nN → cC + dD
The rate law is expressed in terms of [A] and [B] as follows:
Rate = K[A]ᵃ[N]ⁿ
Where K is rate constant.
For the reaction:
NH4+ + NO2– ⟶ N2 + 2H2O
The rate law is:
Rate = K[NH₄⁺][NO₂⁻]As was said in the problem, the rate is porportional to [NH₄⁺] and to [NO₂⁻]
You can tell if an object is in motion if ___.
A. Its reference point is in motion
B. Its reference point is stationary
C. Its position changes relative to a reference point
D. It appears to move backward when another object moves forward
Answer:
c
Explanation:
I think that's the answer
Find the volume in milliliters (ml) of 25gof benzene. The density of benzene is 0.8765 g/mL
Answer:
28.52 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{25}{0.8765} \\ = 28.52253...[/tex]
We have the final answer as
28.52 mLHope this helps you
All living organisms are composed of
OA. at least three cells.
ОВ.
one or more cells.
OC. at least 100 cells.
OD. only one cell.
Answer:
B
Explanation:
all living things are composed of one or more cells
If you have 116 grams of Table Salt (NaCl), how many moles of salt do you have?
a
Ob
1.99 g
3.27 g
5.05 g
0.50 g
d
Question 8 point
Answer:
a. 1.99 mol
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
116 g NaCl
Step 2: Identify Conversions
Molar Mass of Na - 22.99 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of NaCl - 22.99 + 35.45 = 58.44 g/mol
Step 3: Convert
[tex]116 \ g \ NaCl(\frac{1 \ mol \ NaCl}{58.44 \ g \ NaCl} )[/tex] = 1.98494 mol NaCl
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
1.98494 mol NaCl ≈ 1.98 mol NaCl
What is the percent composition of Ca(C2H3O2)2?
Select one:
a) 25.3% Ca, 30.4% C, 3.8% H, 40.5% O
b) 40.4% Ca, 24.2% C, 3.1% H, 32.3% O
c) 6.67% Ca, 26.67% C, 40.0% H, 26.67% O
d) 12.5% Ca, 25% C, 37.5% H, 25% O
Answer:
A
Explanation:
RMM of ca(c2h302)2=158
%Ca= 40/158×100=25.3
%C=48/158×100=30.3
%H=6/158×100=3.7
%O=64/158×100=40.5
Answer:
a) 25.3% Ca, 30.4% C, 3.8% H, 40.5% O
Explanation:
Molar mass of Ca(C₂H₃O₂)₂ = 158.160 g/mol
percent composition:
Ca = (40 /158.160 ) × 100
Ca = 25.3%
C = (48 /158.160 ) × 100
C = 30.4%
H = (6 /158.160 ) × 100
H = 3.8%
O = (64 /158.160 ) × 100
O = 40.5%
40.5% + 3.8% + 30.4% + 25.3% = 100%
It means 1st option is correct.
The boiling point of chlorine (Cl2) is 171.6 K. Which of the
following best predicts the boiling point of iodine (12)?
Answer:
The boiling point of iodine is 363.7°F / 184.3°C
Please explain thank you! Xoxo!
How many molecules of NH3 will be produced if I use 10g of H2?
Answer:
20.05 ×10²³ molecules
Explanation:
Given data:
Mass of hydrogen = 10 g
Number of molecules of ammonia = ?
Solution:
Chemical equation:
3H₂ + N₂ → 2NH₃
Number of moles of hydrogen:
Number of moles = mass / molar mass
Number of moles = 10 g / 2 g/mol
Number of moles = 5 mol
now we will compare the moles of hydrogen and ammonia.
H₂ : NH₃
3 : 2
5 : 2/3×5 = 3.33 mol
Number of molecules of ammonia:
1 mole contain 6.022 ×10²³ molecules
3.33 mol × 6.022 ×10²³ molecules / 1 mol
20.05 ×10²³ molecules
Why is the C-O bond considered to be polar?
The molecule is symmetrical.
The electronegativity difference of the atoms in the bond.
Answer:
The electronegativity difference of the atoms in the bond.
Explanation:
Carbon is electropositive while Oxygen is highly electronegative, hence highly polar due to strong intermolecular forces.
The molecule is not symmetrical because it's dipole moments don't cancel out.
Which describes a stationary reference point?
A. A slower moving truck from the point of view of a car passing it
B. A plan from the point of view a falling sky driver
C. A tree from the point of view of someone in a moving car
D. The sun from the point of view of someone sitting outside
Answer: C
Explanation: