Answer:
Neutrons
Explanation:
How would you find the density of a can of soda pop?
A. Find the mass of the can of soda pop and then multiply by the number of cubic centimeters in the can
B. Find the mass of the can of soda pop and then divide by the number of cubic centimeters in the can
C. Convert a gallon into cubic centimeters and then divide by the mass of the can of soda pop
D. Convert a gallon into cubic centimeters and then subtract the mass of the can of soda pop
Answer:
it's A.
Explanation:
have uh good day ma :)))))))
If 1.5 moles of NaC₂H₃O₂ are dissolved in 750g of water, what is the molality of this solution?
2.0m
1.5m
2.6m
0.9m
Answer:
2m.
Explanation:
molality = no.of moles of solute ÷ mass of solvent in kg
molalty = 1.5 moles ÷ 0.75 g
= 2m
Which form of emission is commonly not written in nuclear equations because they do not affect charges, atomic numbers, or mass numbers?
alpha particle
beta particle
gamma ray
Answer: It is Gamma ray
Answer:
C. gamma ray
(Photo for proof at the bottom.)
Explanation:
A gamma ray is a type of radiation that occurs when an unstable nucleus emits a photon, the smallest unit of light. A photon has no mass or charge. Atomic and mass numbers are written based on the mass of the atom. But since no mass is lost when a photon is emitted, writing the emission of it isn't necessary.
Here's a photo of Edge, good luck.
PLS HELPP ...All alkali metals react with water to produce hydrogen gas and the corresponding alkali metal hydroxide
A typical is that between lithium and water: 2Li(s) + 2H2O(l) 2LiOH(aq) + H2(g)
(a) How many moles of H2 can be formed by the complete reaction of 6.23 moles of Li with
water?
(b) How many grams of H2 can be formed by the complete reaction of 80.57 g of Li with
water?
Answer:
A) 3.115 mol
B) 11.60 g h2
Explanation:
From the equation
2 mol Li gives 1 mol H2
Then 6.23 gives??
6.23 /2 = 3.116 mol H2
B) moles of Li =mass! molar mass
= 80.57/ 6.941 = 11.6 mol Li
Then moles of H2 = 11.6 /2 = 5.8 mol H2
Mass of H2 = mol * molar mass
5.8*2 =11.6 g h2
The moles of hydrogen formed with 6.23 moles of Li have been 3.115 moles. The mass of hydrogen formed with 80.57 grams of Li has been 11.60 grams.
From the balanced chemical equation,
2 moles Li = 1 mole Hydrogen
(a) The given moles of Li = 6.23 mol .
6.23 mol of Li = [tex]\rm \dfrac{1}{2}\;\times\;6.23[/tex] moles of hydrogen
6.23 mol Li = 3.115 moles of hydrogen.
The moles of hydrogen formed with 6.23 moles of Li have been 3.115 moles.
(b) The moles can be expressed as:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of Li in 80.57 grams:
Moles of Li = [tex]\rm \dfrac{80.57}{6.941}[/tex]
Moles of Li = 11.60 moles
The amount of Hydrogen formed:
2 moles Li = 1 mole Hydrogen
11.60 mol of Li = [tex]\rm \dfrac{1}{2}\;\times\;11.60[/tex] moles of hydrogen
11.60 mol Li = 5.803 moles of hydrogen.
Mass = moles × molecular mass
Mass of 5.803 moles of Hydrogen = 5.803 × 2
Mass of hydrogen = 11.60 grams
The mass of hydrogen formed with 80.57 grams of Li has been 11.60 grams.
For more information about the moles formed, refer to the link:
https://brainly.com/question/19085755
2. (a) Solid calcium oxide was taken in a container and water was added slowly to it:
(i) Write the observation.
PLS ANSWERR
Explanation:
(i) Two observations made in the experiment are:-
(a) Temperature is raised due to the vigorous reaction.
(b) It is an exothermic reaction, heat is observed.
(ii)
quicklime
CaO
(s)+
water
H
2
O
(l)⟶
CalciumHydroxide
Ca(OH)
2
+Δ(heat)
∴ Calcium Hydroxide is produced.
this is a attachment from my text book can you help me
Answer:
Looks like a mitrochondria
Explanation:
Balance the following chemical equation. Choose the correct coefficients in the balanced equation in order. *
4, 3, 2
2, 4, 2
1, 1, 1
3, 2, 3
Answer: 4,3,2
Explanation:
What is the molarity of 125 mL of a 8.25 M NaCl solution that has been diluted to 750. mL?
a) 11 400 M
b) 0.00138 M
c) 1380 M
d) 0.0202 M
e) 1.38 M
Answer:
1.375 M
Explanation:
Using the formula as follows;
C1V1 = C2V2
Where;
C1 = initial concentration/molarity (M)
V1 = initial volume (L)
C2 = final concentration/molarity (M)
V2 = final volume (L)
According to the information in this question;
C1 = 8.25 M
C2 = ?
V1 = 125 mL = 125/1000 = 0.125L
V2 = 750 mL = 750/1000 = 0.750L
Using C1V1 = C2V2
8.25 × 0.125 = C2 × 0.750
1.03125 = 0.750C2
C2 = 1.03125 ÷ 0.750
C2 = 1.375 M
How many grams of Ca(OH)2 would be needed to make 500 mL of a 0.450 mol/L solution?
113 g
133 g
41.2 g
16.68 g
Answer:
[tex]\boxed {\boxed {\sf 16.68 \ g\ Ca(OH)_2}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter.
[tex]molarity = \frac{moles \ of \ solute}{liters \ of \ solution}[/tex]
The molarity is 0.450 moles per liter. The moles of solute is unknown.
The volume of the solution is 500 milliliters, but we want to know the liters. We need to convert the units. Remember that 1 liter contains 1000 milliliters.
[tex]\frac{ 1 \ L}{1000 \ mL}[/tex][tex]500 \ mL *\frac{ 1 \ L}{1000 \ mL}[/tex][tex]500 *\frac{ 1 \ L}{1000 }[/tex][tex]\frac{500}{1000} \ L =0.500 \ L[/tex]So, we have values for all the variables:
molarity= 0.450 mol/L moles of solute = xliters of solution =0.500 LSubstitute the values into the formula.
[tex]0.450 \ mol /L *\frac{x}{0.500 \ L}[/tex]
We want to solve for x, the moles of solute. x is being divided by 0.500 liters. The inverse of division is multiplication, so multiply both sides by 0.500 L.
[tex]0.500 \ L *0.450 \ mol /L =\frac{x}{0.500 \ L}*0.500 \ L[/tex]
[tex]0.500 \ L *0.450 \ mol /L =x[/tex]
The units of liters cancel.
[tex]0.500 *0.450 \ mol=x[/tex]
[tex]0.225 \ mol =x[/tex]
Now we have the moles and need to convert to grams. This is done using the molar mass (mass per 1 mole). The values are found on the Periodic Table as atomic masses, but the units are grams per mole instead of atomic mass units.
The solute is Ca(OH)₂, so lookup the molar masses of the individual elements.
Ca:40.08 g/mol O: 15.999 g/mol H: 1.008 g/molNote there is a subscript of around OH. There are 2 hydroxide molecules, so there are 2 oxygen and 2 hydrogen atoms. We must multiply their molar masses by 2 before adding all the values.
Ca(OH)₂= 40.08 + 2(15.999)+2(1.008)=74.094 g/molUse the molar mass as a ratio.
[tex]\frac{74.094 \ g \ Ca(OH)_2} {1 \ mol \ Ca(OH)_2}[/tex]
Multiply by the number of moles calculated.
[tex]0.225 \ mol \ Ca(OH)_2 *\frac{74.094 \ g \ Ca(OH)_2} {1 \ mol \ Ca(OH)_2}[/tex]
The units of moles of calcium hydroxide cancel.
[tex]0.225 *\frac{74.094 \ g \ Ca(OH)_2} {1}[/tex]
[tex]16.67115 \ g\ Ca(OH)_2[/tex]
16.68 grams of calcium hydroxide are needed.
What are the coefficients that will balance the skeleton equation below?
N, + H2
H NH3
1, 1, 2
3, 1, 2
1, 3,2
1, 3,3
Answer:
the answer is 1,3,2
Explanation:
Balance equation
Answer:
1,3,2
Explanation:
took test
When performing dimensional analysis, we usually use conversion factors. What is a conversion factor?
Answer:
A conversion factor is a variable that transforms the dimension of one variable into the terms of another variable.
Explanation:
Let be [tex]x[/tex] and [tex]y[/tex] two variables with diferent dimensions (units), [tex]r[/tex] is a conversion if transforms the dimension of one variable into the terms of the other variable. That is:
[tex]y = r\cdot x[/tex] (1)
Where:
[tex]x[/tex] - Input, [input unit]
[tex]y[/tex] - Output, [output unit]
[tex]r[/tex] - Conversion factor, [output unit] per [input unit]
Balance the equation ___C+___Fe203—-____CO2+___Fe
Answer:
3,2,3,4
Explanation:
try this answer, it's syits best to the question
How many joules of heat is needed to heat 68.00 grams of aluminum foil from
55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C?
Answer:
2,325.6
Explanation:
You use the formula
Q =mco
M =mass =68
C=0.9
O=temperature increases =93-55=38
Then multiple all this 3
Q=68*0.9*38
The number of joules of heat that is needed to heat 68.00 grams of aluminum foil is 2,325.6.
What is specific heat?The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.
By the formula of heat
Q = mct
The mass of aluminum is 68.00
the difference in temperature is 93.00 °C - 55.00 °C = 38.00
The specific heat is 0.90 J/g
Putting the values in the equation
[tex]Q = mct\\\\Q = 68.00 \times 0.90 \times 38.00 = 2325.6[/tex]
Thus, the joules of heat is 2325.6 J.
Learn more about specific heat
https://brainly.com/question/11297584
#SPJ2
If a solution has a [H+] of 9.3x10-11, what is the pH?
Answer:
10.03Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]ph = - log(9.3 \times {10}^{ - 11} ) \\ = 10.0315...[/tex]
We have the final answer as
10.03Hope this helps you
temperature layer of the atmosphere with strong, steady winds and few weather changes.
What does it called?
Answer:
Stratosphere is heated from below the ozone layer, that because it protect the earth from ultraviolet rays from the sun. Mesophere has strong steady wind and few weather changes because the temperature in the mesophere drops and it has a strong wind coming from the east to the west.
Please help!!
All fake answers get reported immediately. Yes, I am a girl -_-
Answer:
1.)C₃H₈O
2)OH
3.)1-propanol
1.) C4H8O
2.) C2H6O or CH3CH2OH
3.)Ethanol
Explanation:
Hope this help
A bowl containing 150 grams of water, is heated from 25 °C to 100 °C.
The specific heat of water is 4.184 J/gºC. How much heat energy is
required to heat the water?
Answer:
47,070J
Explanation:
Because we use the formula
Eh= m×c×∆T
Which is energy required equals mass times specific heat capacity times change in tempreture (final temp - initial temp )
How many meters in 500 km?
5,000
0.005
500,000
0.5000
Answer:
c i need 3 brainliests for virtuoso rank pls
Explanation:
Answer:
500,000 m
Explanation:
Each km has 1000m so to covert any km to m simply multiply the length value by 1000.
500 x 1000 = 500,000
What does an emission spectrum look like?
A. It is a set of lines corresponding to photon emission wavelengths.
B. It is a white light source separated into a band of colors.
C. It is a graph showing the temperature dependence of emissions.
D. It is a band of colors with dark lines at absorption wavelengths.
SUERIT
Answer:
It should be B
Answer:
The answer is It is a set of lines corresponding to photon emission wavelengths.
Explanation:
I just did it on A pex and this is correct. Maybe there is a question with similar wording that is making other people get the answer wrong so make sure that your question says "What does an emission spectrum look like" and then your answer will be A.
Question 2(Multiple Choice Worth 2 points)
(04.06 LC)
The properties of elements can be predicted by which of the following?
Where it is on the periodic table
Where it was discovered
Its color in its natural state
Its name
Answer:
location on the periodic table
Explanation:
2. If a gas at 500 mL has a temperature of 45°C, then what is the new volume when the temperature is increased to 65°C? Show your work.
Answer:
V2= 531.4 ml
Explanation:
T1= 273+45 °C= 318 Kelvin
T2= 273+65 °C= 338 Kelvin
V1= 500ml *( 0.001L/1ml)= 0.5 Liters
V2= [tex]\frac{V1 * T2}{T1}[/tex]= [tex]\frac{0.5 L * 338K}{318K}[/tex] = 0.5314465409 Liters* (1 ml/0.001 L)= 531.4 ml
can anyone tell me the answer
Answer:
A. A as concentration decreases.
Explanation:
A represents a reactant and B is a product, the concentration of the latter increases at the expense of the concentration of the former. Hence, A is the reactant of the chemical reaction as its concentration decreases.
What is the mass number of sodium
Answer:
Explanation:
Sodium mass number 23, 11 electrons
Magnesium: neutrons = 12
aluminum : atomic number = 13
phosporus : protons = 15
Answer:
23
Explanation:
You need to add protons and neutrons to get mass
3. How much heat (in joules) is needed to raise the temperature of 355 g of ethanol I
(c = 2.4 J/gºC) by 63°C?
q=mcAT
Answer:
53676 J
Explanation:
m = 355 g
c = 2.4 J/gºC
ΔT = 63°C
q = mcΔT
= (355)(2.4)(63)
= 53676 J
The amount of heat is 53676J to raise the temperature of 355 g of ethanol.
What is temperature?Temperature is a measurement of the amount of energy of the atoms in a system or a physical quantity that expresses hot and cold.
What is heat?Heat is energy that is transmitted through one body to some other due to a temperature differential. When two bodies of different temperatures come together, energy can be transferred (heat flows) from the hotter to the colder.
It can be determined by the formula:
q =mCΔT.
where, q is heat, m is mass , C is and T is temperature.
Calculation of heat is shown below:
It is given that, mass of ethanol = 355 g, c = [tex]2.4 J/g^{0}[/tex] C, ΔT. = [tex]63^{0} C[/tex]
Now, put the values of given data in heat formula:
q =mCΔT
= 355×2.4×63
=53676J.
Therefore, the amount of heat will be 53676J to raise the temperature of 355 g of ethanol
To know more about heat and temperature click here.
https://brainly.com/question/1429452.
#SPJ2
Consider the chemical equation. 2NBr3 + 3NaOH Right arrow. N2 + 3NaBr + 3HOBr If there are 40 mol of NBr3 and 48 mol of NaOH, what is the excess reactant?
Answer:
NBr₃ is the excess reactant.
Explanation:
2NBr₃ + 3NaOH → N₂ + 3NaBr + 3HOBrWe can solve this problem by calculating how many moles of NaOH would react completely with 40 moles of NBr₃, using the stoichiometric coefficients of the reaction:
40 mol NBr₃ * [tex]\frac{3molNaOH}{2molNBr_3}[/tex] =60 moles NaOHAs the required number of NaOH moles is higher than the available number (60 required vs 48 available), NaOH is the limiting reactant.
As such, the excess reactant is NBr₃.
11A) As electrical energy is converted into heat energy, the total amount of energy in the system
pls help me out !
Answer:
b. option Is the correct answer
Studies show that
O the more you sit, the higher your risk for depression,
O the less you sit, the higher your risk for depression
O the more you sit, the lower your risk for depression
O none of the above
Answer:
it will be none of the above because sitting doesn't cause depression, it's the environment around that person. the body language, the way they talk... Etc.
6. If the pressure of a gas is 1.01 atm and the temperature is 25°C, then if the pressure is increased to 1.10, what is the new temperature?
Answer:
324.554 K
Explanation:
Which can be converted back to °C by subtracting 273
Once again thus answer can be found using the gas law P1/T1 =P2/T2
Remember to convert to Kelvin before doing the calculations by adding 273
A car is moving at a speed of 55 km/h. is it possible to calculate the car's kinetic energy on this information? 1 no. we also need to know the car's mass 2 yes. kinetic energy is equal to half of the square of the car's speed 3no. we also need to know the direction motion of the car 4. yes. kinetic energy is equal to the square of the car's speed
NO LINKS PLS!!!!! ILL REPORT YOU
Answer:
the answer is 1; no, you also need to know the car's mass.
Explanation:
The total pressure of two unknown gases is 5 kPa. The partial pressure of one of the gases is 2.345 kPa, what is the partial pressure of the other gas?
Answer:
[tex]p_2=2.655kPa[/tex]
Explanation:
Hello there!
In this case, according to the Dalton's law, which states that the total pressure is equal the sum of the pressures of the gases in the mixture, we write the following for this system:
[tex]P_T=p_1+p_2[/tex]
Thus, we solve for the partial pressure of the gas #2 as shown below:
[tex]p_2=P_T-p_1\\\\p_2=5kPa-2.345kPa\\\\p_2=2.655kPa[/tex]
Best regards!
