Answer:
24,000 years
Explanation:
0.39 moles of a gas fill a 5.0 l container that connects to a balloon through a closed valve. if the valve is opened an pressure remains the same, what would be the total number of moles of gas needed in order to inflate the balloon by 1.5
Answer: 5.39
Explanation: you are adding the balloon's volume and the container's volume
Brainliest and a free hug :) thank you!!
The mass in a chemical reaction is found in
the energy produced by the reaction
the explosion produced by the chemical reaction
the atoms involved in the chemical reaction
the bonds involved in the chemical reaction
Answer:atoms involved in reaction. Mass remains same in reaction
Explanation: hug would be fine!
Which ion dissociates in Acids?
A- ООН-
B- ОН+
C- ОН+
D- COOH
Which formula demonstrates a double replacement reaction?
1. A + B --> AB
2. AB + CD --> AC + BD
3. AB --> A + B
4. A + BC --> AC + B
Answer:
2
Explanation:
which one is correct for #4 ??
Answer:
The answer of this question is A
Answer: B is the right
Explanation:
When a small piece of sodium metal is dropped into a beaker of water, hydrogen gas (H2) and a solution of sodium hydroxide (NaOH) are products. The solution becomes warm.
Answer:
The reaction is exothermic as the solution becomes warm.
Explanation:
Hello there!
In this case according to the described reaction between sodium metal and water, we can write up the chemical equation whereas the products turn out to be sodium hydroxide and hydrogen gas:
[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]
Moreover, these reactions are known to be highly exothermic, for that reason the solution becomes warm as the reaction releases heat as it goes to completion.
Best regards!
determine the molar mass of water. WRITE THE UNITS
Which of these would be found in a wetland?
Mrs. Cornell and vultures
Cattails and salamanders
Maple trees and cats
Oak trees and squirrels
Answer:
jwjsjdjdhdvjeiejjrjrje
AQRS is an isosceles triangle. What is the length of RT
? Round to the nearest hundredth. Enter your answer in the box.
11 cm
a
T 6cm s
Answer:
Length of RT = 9.22 cm to the nearest hundredth
Explanation:
Considering the image up in the attachment, ΔRST is a right-angled triangle.
The length of two sides of ΔRST is given as 11cm and 6 cm. The length of the third side which is RT can be obtained using Pythagoras ' rule which says that the sum of the squares of two sides of a right-angled triangle is equal to the square of the hypotenuse.
This rule is given as: c² = b² + a² where c is the hypotenuse and a and b are the other two sides of the right-angled triangle.
In ΔRST, the length of the hypotenuse = 11 cm, the length of one of the two sides = 6cm, length of RT = x
Solving for x: (11 cm)² = (x cm)² + (6 cm)²
(x cm)² = 121 cm² - 36 cm²
(x cm)² = 85 cm²
x cm = √85
x = 9.22 cm to the nearest hundredth
Therefore, length of RT = 9.22 cm to the nearest hundredth
The structural layers of the sun are shown in the cross-sectional diagram. An image of six concentric circles is shown. The six layers thus formed are of varying thickness. The layers in order from inside out are labeled, A, B, C, D, E, F. Which layer represents the radiative zone? A B C D (21 points plus brainliest!)
A layer represents the radiative zone which is at the centre of the cross-sectional diagram.
What is a radio active zone?The layer of a star that lies just outside the core, to which radiant energy is transferred from the core in the form of photons.
In the Sun, the region between the solar core at 0.2 of the Sun's radius and the outer convection zone at 0.71 of the Sun's radius is referred to as the radiation zone, although the core is also a radiative region.
Learn more about radio active zone here:
https://brainly.com/question/16239768
#SPJ1
B
A is inner core B is outer core and there is a few other layers but from what I know looking at this the second layer has always been the radioactive zone.
If you get this right I would love brainiest
What type of reaction does this model represent?
1. single replacement
2. double replacement
3. Decomposition
4. double displacement
Answer:
1. single replacement
Explanation:
Single replacement can be represented by AB+C ⇄B+AC, which matches the picture
Double replacement and double displacement are the same kind of reaction and can be represented by AB+CD ⇄BD+AC
Decomposition reaction can be represented by AB ⇄A+B
Complete the following statements of Dalton's atomic model: a) Elements are composed of minute, particles called atoms. b) Atoms of the same element are alike in and size. c) Atoms of different elements have different and sizes. d) Chemical are formed by the union of two or more different atoms of different elements. e) Atoms combine to form compounds in simple numerical , such as one to one, one to two, etc. f) Atoms of two may combine in different ratios to form more than one compound.
Answer:
a. Indivisible.
b. Mass.
c. Masses.
d. Compound.
e. Elements.
Explanation:
An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such defines the structure of a chemical element.
Generally, these atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.
Hence, all the physical properties of a mineral result from the mineral's internal arrangement of atoms.
The following are statements postulated by the Dalton's atomic model;
a) Elements are composed of minute, indivisible particles called atoms.
b) Atoms of the same element are alike in mass and size.
c) Atoms of different elements have different masses and sizes.
d) Chemical compound are formed by the union of two or more different atoms of different elements.
e) Atoms combine to form compounds in simple numerical ratios, such as one to one, one to two, etc.
f) Atoms of two elements may combine in different ratios to form more than one compound.
Which of the following statements are true about a strong base and a weak base at a pH of 11?
A. The weak base will require less HCl to bring the pH to 7 than the strong base.
B. The strong base will require less HCl to bring the pH to 7 than the weak base.
C. Both bases require the same amount of HCl to reach pH 7 because they are both at the same initial pH.
D. HCl will not bring the pH of either solution to pH 7.
Answer:
A, C, D
Explanation:
I
11122
11 / 22
=>
Which of the following hydrogen ion concentrations represents a solution with acidic
properties?
A
?
1 x 10-8 M
В.
?
1 x 10-2 M
C
1 x 10-11 M
D
1x 10-13 M
Activity Index
A
Answer:
A
Explanation: 11/22
17. What is the molarity of ZnCl2 that forms when 15 grams of Zn reacts completely with CuCl, if a
final volume of 175 mL is produced?
Zn + CuCl2 → ZnCl2 + Cu
Answer:
1.31M
Explanation:
Based on the reaction, 1 mole of Zn produce 1 mole of ZnCl₂. As the reaction occurs completely, the moles of Zn added = Moles of ZnCl₂ produced. To find molarity we need the moles of ZnCl₂ and the volume of the solution in liters:
Moles Zn = Moles ZnCl₂ -Molar mass Zn: 65.38g/mol-:
15g * (1mol / 65.38g) = 0.23 moles of ZnCl₂
Volume in Liters:
175mL * (1L / 1000mL) = 0.175L
The molarity is:
0.23moles / 0.175L
1.31MThe heat capacity of aluminum is 0.900 J/gºC. a. How much energy is needed to raise the temperature of an 8.50 x 102g block of aluminum from 22.8°C to 94.6°C?
Recall the heat capacity equation:
q = mc∆T
We're given mass, specific heat capacity, as well as the change in temperature. All we need to do is plug the numbers into the variables and we'll have our answer!
Although this question doesn't try to trick you, more often than not questions regarding energy change will attempt to throw you off with specific heat capacity. It's extremely important to note the units of the specific heat capacity and ensure that the numbers you use are in those units. As an example, the specific heat capacity might be given to you in J/mol*K - in this case, you'd have to do some unit conversions with your given data in order to fit all the numbers. In this question, we're given the specific heat capacity in J/gºC, so we don't need to change anything since all of our data is already in these units.
Anyways, back to the actual question:
q = mc∆T
q = (8.50 * [tex]10^{2}[/tex]) * (0.900) * (94.6 - 22.8)
q = 54927 (J)
Remeber to include significant figures:
54927 = 5.49 * 10^4 (J)
The required energy is 5.49 * [tex]10^{4}[/tex] Joules, or 5.49 * [tex]10^{1}[/tex] kJ
Let me know if you need any of my work to be explained!
- Breezeツ
calculate how many Liters of 0.50 M silver nitrate solution you will need to provide the 2.4x10^-3 moles of silver nitrate
Answer:
4.8x10⁻³ Liters are required
Explanation:
Molarity is an unit of concentration in chemistry defined as the ratio between moles of solute (In this case, silver nitrate) and liters of solution.
The 0.50M solution contains 0.50 moles of silver nitrate per liter of solution.
To provide 2.4x10⁻³ moles Silver nitrate are required:
2.4x10⁻³ moles * (1L / 0.50 moles) =
4.8x10⁻³ Liters are requiredCharacteristic orange light produced by sodium in a fl ame is due to an intense emission called the sodium D line, which is actually a doublet, with wavelengths (measured in vacuum) of 589.157 88 and 589.755 37 nm. The index of refraction of air at a wavelength near 589 nm is 1.000 292 6. Calculate the frequency, wavelength, and wavenumber of each component of the D line, measured in air.
Answer:
a. i. 5.092 × 10²⁰ Hz ii. 588.98554 nm ii. 10667809.11 rad/m
b. i. 5.087 × 10²⁰ Hz ii. 589.58286 nm iii. 10657001.3 rad/m
Explanation:
refractive index, n = λ/λ' where λ = wavelength in vacuum = and λ' = wavelength in air
a. For λ = 589.15788 nm,
i. Frequency,
f = c/λ where c = speed of light in vacuum = 3 × 10⁸ m/s and λ = 589.15788 nm = 589.15788 × 10⁻⁹ m
So, f = 3 × 10⁸ m/s ÷ 589.15788 × 10⁻⁹ m
= 0.005092 × 10¹⁷ /s
= 5.092 × 10²⁰ /s
= 5.092 × 10²⁰ Hz
ii. Wavelength,
Since n = λ/λ' where λ = wavelength in vacuum = and λ' = wavelength in air
and n = 1.0002926
λ' = λ/n
= 589.15788 nm/1.0002926
= 588.98554 nm
iii. Wave number, kk = 2π/λ'
= 2π/588.98554 nm
= 0.01066780911 rad/nm
= 0.01066780911 rad/nm × 10⁹ nm/1m
= 10667809.11 rad/m
b. For λ = 589.755 37 nm.,
i. Frequency,
f = c/λ where c = speed of light in vacuum = 3 × 10⁸ m/s and λ = 589.755 37 nm. = 589.755 37 × 10⁻⁹ m
So, f = 3 × 10⁸ m/s ÷ 589.755 37 × 10⁻⁹ m
= 0.005087 × 10¹⁷ /s
= 5.087 × 10²⁰ /s
= 5.087 × 10²⁰ Hz
ii. Wavelength,
Since n = λ/λ' where λ = wavelength in vacuum = and λ' = wavelength in air
and n = 1.0002926
λ' = λ/n
= 589.755 37 nm./1.0002926
= 589.58286 nm
iii. Wave number, kk = 2π/λ'
= 2π/589.58286 nm
= 0.0106570013 rad/nm
= 0.0106570013 rad/nm × 10⁹ nm/1m
= 10657001.3 rad/m
If you initially have a gas with a pressure of 0.950 atm and a temperature of 35 °C and you heat it to 65 °C, what is the new pressure if volume and moles are held constant? (P2 = 1.04 atm)
Explanation:
fgIf the piston moves so as to increase the pressure of the gas to 2.94 atm, ... new volume of the cylinder? ... A gas has a pressure of 699.0 mm Hg at 40.0°C. What is the temperature (in C) ...
write any two equations to illustrate that hydrogen gas is a reducing agent
Which indicator would show a pH change from 6 to 7?
A. Red litmus indicator
B. Methyl red indicator
C. Phenol red indicator
D. Blue litmus indicator
Answer:
c
Explanation:
1. litmus paper is used when showing a change between a greater range in ph levels - so A and D are automatically a no.
2. methyl red is used to show a range in ph levels between 4.8-6
3. Option C is the only one left so im going to assume its C because its definitely not A, B, or D
Weight is the measure of gravity on an object measured by a weight in Newtons. Weight changes if gravitational force changes.
Mass is the amount of kilogram in an object measured by a __________ in grams and does not change…it stays the _________.
Mass is an intrinsic property of matter and is measured in kilograms. The mass of a bird is a constant. A 15-gram bird is 15 grams, whether measured on the Earth, the Moon, or Mars. Weight is a measure ofthe force of gravity on a physical object and is measured in newtons.
What is the number of particles after gluecose is mixed with water
Answer: dissolves
Explanation:
When you stir a spoonful of sugar into a glass of water, you are forming a solution. This type of liquid solution is composed of a solid solute, which is the sugar, and a liquid solvent, which is the water. As the sugar molecules spread evenly throughout the water, the sugar dissolves.
When an aqueous solution of silver nitrate is
mixed with an aqueous solution of potassium
chloride which are the spectator ions?
Answer:
[tex]K^{+}[/tex] and [tex]NO_{3}^{-}[/tex]
Explanation:
The equation for the reaction is AgNO3(aq) + KCl(aq) ==> AgCl(s) + KNO3(aq)
With all the ions, it is
[tex]Ag^{+}[/tex](aq) + [tex]NO_{3} ^{-}[/tex](aq) + [tex]K^{+}[/tex](aq) + [tex]Cl^{-}[/tex](aq) ==> AgCl(s) +
[tex]K^{+}[/tex] and [tex]NO_{3} ^{-}[/tex] do not change, so they are the spectator ions and are removed
The ionic equation is:
[tex]Ag^{+}[/tex](aq) + [tex]Cl^{-}[/tex](aq) ==> AgCl(s)
What two properties of sound remain the same when sound quality differs? Check all that apply.
Answer: I don’t know sorry
Explanation:
Explain how the copper could be in the lake sample near the picnic area but not have been detected by this test.
Answer:
May be the instrument is incorrect or may be error in it.
Explanation:
The copper have not been detected by this test because the test may be not for the detection of copper, may be it is used for identification of another minerals. If there is copper in the lake sample but can't be detected in the test so it means that the instrument which is used for detection is not the right one or having error in that instrument. Every mineral has a specific type of instrument that detect its presence, if we use incorrect instrument for the mineral then we can't detect the presence of that specific mineral.
One advantage to using nuclear power is —
it produces no air pollution
it is hard to store and dispose of the waste
the expense of constructing nuclear reactors
the threat of an accident
Answer:
it produces no air pollution
A car accelerates away from the starting line at 3.6 m/s2 and has the mass of 2400 kg. What is the net force acting on the vehicle?
__ Newtons ??
Answer:
8640 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
net force = 2400 × 3.6
We have the final answer as
8640 NHope this helps you
How are the environment of a swamp in a rain forest similar
Select the correct answer.
What data points do we combine to make the integrated rate law?
a) initial concentration and time
B) concentration at some later time, time, and rate constant
C) initial concentration, concentration at some later time, and time
D) initial concentration, concentration at some later time, time, and rate constant
Answer:
b???
Explanation:
Answer:
Pretty sure it A.
Explanation:
I just thought that cause what exactly does 'some later time' mean?