Answer:
The answer is option BExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass of gold bar = 34.5 g
volume = 17 mL
We have
[tex]density = \frac{34.5}{17} \\ = 2.02941176...[/tex]
We have the final answer as
2.0 g/cm³Hope this helps you
What is the chemical equation for the decomposition reaction of sulphuric acid?
PLEASE HELP ASAP DUE INNA COUPLE MINUTES ILL MARK BRAINLIEST JUST HELP QUCIK
Answer: This occurs becuase the wall is more positively charged than the ballon. As the wall and balloon come in contact the balloon sticks due to the rule that opposites attract meaning positive attracts negative. The negatively charged balloon attracts the electrons in the paper because it's positive since positive attracts negative.
Explanation:
According to the big bang theory, the universe—all of the stars, planets, and galaxies everywhere—began as a very small, dense mass. This mass expanded suddenly in an incredibly hot explosion-like event, and it has spent the last 13.7 billion years rapidly expanding and cooling.
In 1964, which of the following space technologies provided scientists with the best evidence that the universe was created in the big bang?
A.
a lunar module
B.
a Mars rover
C.
a radio telescope
D.
a weather satellite
a chemical reaction occurs when blank
Answer:
When atoms are formed or broken.
Explanation:
The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
A pond has the dimensions of 25 meters long by 20 meters wide. If there are 100 frogs living in the pond, what is the "population density" of the frogs?
A. 0.2frogs/sq meter
B. 0.5 frogs/sq meter
C. 2 frogs/sq meter
D. 5 frogs/sq meter
HELPP its a test!
Answer:
D. 5 frogs/sq meter
Explanation:
1. Calculate the amount of energy given off when 17 g of vapor at 102C condenses to 87C
Did a phase change occur? If so, which one? Is this endothermic or exothermic?
Answer:
- Amount of energy = -1066.92 J
- Yes, a phase change occurs from gaseous state to liquid state
- It is exothermic
Explanation:
Using Q = m × c × ∆T
Where Q = amount of energy
m = mass = 17g
c = specific heat capacity of water (4.184J/g°C)
∆T = change in temperature (87°C - 102°C = -15°C)
Hence, Q = m × c × ∆T
Q = 17 × 4.184 × (-15°C)
Q = -1066.92 J
- According to this question, vapor condenses i.e. gaseous form of water changes to liquid water, which involves a reduction in temperature. Hence, a change of phase occurs from gaseous state to liquid state.
- Since the change of phase occurs from a less orderly state (gas) to a more orderly state (liquid), there is a release of energy i.e. EXOTHERMIC. The amount of energy or Enthalpy change (∆H) is negative
Scientists examine the light spectra from distant stars to determine if the size of the universe is changing. Why do astronomers believe the size of the universe is changing?
options:
The red shift indicates that distant galaxies are moving away from each other.
The red shift indicates that distant galaxies are moving towards each other
The blue shift indicates that distant galaxies are moving away from each other
The blue shift indicates that distant galaxies are moving towards each other
Answer: A
Explanation:
Red shifting occurs when objects move away from each other. You can think of the light wave being "stretched." A stretching of the wave causes a higher wavelength, and less energy, which are the characteristics of red light.
Observe Record the appearance (colors,
textures, etc.) of the reactants in the data table.
The reactant Zn is
A. An element
B. An iconic compound
C. A molecule
D. An oxide
The reactant CuSO4 İs
A. An element
B. An iconic compound
C. A molecule
D. An oxide
Answer:
1) Zn is a element
2)CuSO4 is an ionic compound
Explanation:
Answer: an element and an ionic compound
Explanation: my mom told me
How do multiple bonds affect the shape of a molecule?.
Answer:
hyprogenic
Explanation:
hope it's help
make me brainless tyy
To help relieve pain during a dental visit, a dentist may give a patient nitrous oxide. Nitrous oxide is made in factories by carefully heating ammonium nitrate. At 170°C, ammonium nitrate breaks down and forms a mixture of nitrous oxide gas and water vapor. After the mixture is collected, the water vapor is separated from the nitrous oxide gas. Complete the sentence.
Answer:
The answer is "Ammonium nitrate is the reactant of this chemical reaction".
Explanation:
The Ammonium nitrate (NH4NO3) is an ammonium and nitrate ionic crystalline solid. In water and hygroscopic as a strong, it's also highly soluble, although it does not form hydrates.
It uses as a nutrient for generating medications as well as leaven fertilizers and explosive materials. Nitrate in ammonium is sodium bicarbonate ammonium chloride. It is incendiary, an oxidizing agent, and a fertilizer.
I NEED HELP ASAP! PLEASE BE GENUINE
1. A sample of an unknown gas effuses in 11.1 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.42 min. What is the molar mass of the unknown gas? (MM of H2 = 2.02 g/mol)
2. A steel tank has a volume of 438 L and is filled with 0.885 kg of O2. Calculate the pressure of O2 at 21.0 degrees Celsius. (MM of O2 = 32.00 g/mol)
PLEASE INCLUDE THE GIVEN AND REQUIRED! :)
1. The molar mass of the unknown gas obtained is 0.096 g/mol
2. The pressure of the oxygen gas in the tank is 1.524 atm
Graham's law of diffusionThis states that the rate of diffusion of a gas is inversely proportional to the square root of the molar mass i.e
R ∝ 1/ √M
R₁/R₂ = √(M₂/M₁)
1. How to determine the molar mass of the gas Rate of unknown gas (R₁) = 11.1 minsRate of H₂ (R₂) = 2.42 minsMolar mass of H₂ (M₂) = 2.02 g/mol Molar mass of unknown gas (M₁) =?R₁/R₂ = √(M₂/M₁)
11.1 / 2.42 = √(2.02 / M₁)
Square both side
(11.1 / 2.42)² = 2.02 / M₁
Cross multiply
(11.1 / 2.42)² × M₁ = 2.02
Divide both side by (11.1 / 2.42)²
M₁ = 2.02 / (11.1 / 2.42)²
M₁ = 0.096 g/mol
2. How to determine the pressure of O₂From the question given above, the following data were obtained:
Volume (V) = 438 L Mass of O₂ = 0.885 kg = 885 gMolar mass of O₂ = 32 g/mol Mole of of O₂ (n) = 885 / 32 = 27.65625 molesTemperature (T) = 21 °C = 21 + 273 = 294 KGas constant (R) = 0.0821 atm.L/Kmol Pressure (P) =?The pressure of the gas can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
Divide both side by V
P = nRT / V
P = (27.65625 × 0.0821 × 294) / 438
P = 1.524 atm
Learn more about Graham's law of diffusion:
https://brainly.com/question/14004529
Learn more about ideal gas equation:
https://brainly.com/question/4147359
To what volume should 25 ml of 15 M nitric acid be diluted to prepare a 3.0 M solution?
Answer:
We can use the dilution formula to find the volume of the diluted solution to be prepared
c1v1 = c2v2
Where c1 is concentration and v1 is volume of the concentrated solution
And c2 is concentration and v2 is volume of the diluted solution to be prepared
Substituting the values in the equation
15 M x 25 mL = 3 M x v2
v2 = 125 mL
The 25 mL concentrated solution should be diluted with distilled water upto 125 mL to make a 3 M solution
TRUE OR FALSE:
Most living organisms are composed of cells
Answer:
True
Explanation:
Everything is made up of matter, therefore everything (living) is made up of cells.
This statement is True.
All living organisms are composed of one or more cells. Cells are what make up our bodies. Cells are the basic unit of life.
25 m/s to miles/hr? pls show work!
Answer:
25 miles per second to X miles per hour
Formula = for an approximate result, multiply the speed value by 2.23
25 m/s x 2.23 ≈ 55.92 mph
what's the purpose of a compounds lab
Answer:
The purpose of a lab report is to organize and communicate what you did in your experiment.
Explanation:
Answer:
Compound microscopes are used to view small samples that can not be identified with the naked eye.
Explanation:
These samples are typically placed on a slide under the microscope. When using a stereo microscope, there is more room under the microscope for larger samples such as rocks or flowers and slides are not required.
Hope this helps :)
A nitrogen gas collected in a tube has a volume of 0.86 mL, a temperature of 316.48 degrees kelvin, and a pressure 1.17 atm. Two days later, the volume of the nitrogen was 1.06 mL but the pressure did not change. What was the temperature two days later
What is conduction? (4 points)
a Transfer of heat through circular movement
b Transfer of heat through direct physical contact
c Transfer of heat through electromagnetic waves
d Transfer of heat through the movement of particles
Answer:
Your Answer would be Option B
Answer:
B
Explanation:
The Answer is B-Transfer of heat through direct physical contact
Which of the following is a sign that a chemical change is taking place?
Select one:
A.
a substance melting at high heat
B.
an object breaking into pieces
C.
a blue solid dissolving in water and changing the water to a blue colour
D.
an offensive odor emitting after two liquids are mixed
Answer:
C. a blue solid dissolving in a water and changing the water to a blue colour
Explanation:
Which of the following statements is true about the subatomic particles of an
atom?
O Protons weigh less than electrons.
Protons weigh less than neutrons.
O Protons and neutrons have the same mass.
Electrons weigh more than neutrons.
ctor
O None
Answer:
B. Protons weigh less than neutrons.
Explanation:
Option 1: Wrong
The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom.
Option 2: Correct
Neutron's second down quark is heavier than the proton's second up quark. So the greater mass of this down quark gives the neutron a greater mass than the proton.
Option 3: Wrong
The proton and neutron have similar, but not identical masses. Either of these particles has a mass approximately 2000 times greater than the mass of an electron. ... The electrons make the greatest contribution to the chemical properties of the atom.
Option 4: Wrong
A neutron is made up of 2 down quarks and 1 up quark, bound together by 3 gluons. A proton is made up of 1 up quark and 2 down quarks, again, bound together by 3 gluons. The up quark is the lightest quark, and any other type is heavier. Both hadrons have 3 gluons, an up and a down quark in common. The only particles left are an up quark from the proton and a down quark from the neutron. Since any other quark is heavier than an up quark, the down quark is heavier. And same+lighter<same+heavier.
A proton and a neutron have a mass approximately 2000 times (x1836) of an electron each.
that is the one i need help with
Answer:
79
Explanation:
This is the answer I نخل جکڑ disparity disguising
Give two examples of an ionic compound?
A sample of argon gas is at a temperature of 20 degrees celsius. The temperature is increased to 30 degrees celsius so that the volume is now 373 mL. What was the original volume?
The original volume is equal to 248.6 mL.
General gas law
To find the value of pressure, volume or temperature of a gas after a transformation, one must use the general gas law:
[tex]\frac{P_1 V_1}{T_1} =\frac{P_2 V_2}{T_2}[/tex]
Thus, as the pressure does not change, it is enough to substitute the values in the above formula, such that:
[tex]\frac{V_1}{20}=\frac{373}{30} \\ V_1 = 248.6mL[/tex]
So, the original volume is equal to 248.6 mL.
Learn more about gas law in: brainly.com/question/1190311
A mixture of three noble gases has a total pressure of 1. 25 atm. The individual pressures exerted by neon and argon are 0. 68 atm and 0. 35 atm, respectively. What is the partial pressure of the third gas, helium? Use P subscript T equals P subscript 1 plus P subscript 2 plus P subscript 3 plus ellipses plus P subscript n. 0. 22 atm 0. 33 atm 1. 03 atm 2. 28 atm.
The partial pressure of the third gas, helium will be [tex]P_h=0.22\ atm[/tex]
What is partial pressure?According to Dolton's law of partial pressure if the mixture of gases exists in a container then the total pressure exerted by the gas will be the sum of the partial pressure of each case.
Now from the question, it is given
The total pressure of the three noble gases [tex]P_t=1.25\ atm[/tex]
The individual pressure of Neon= 0.68 atm
The individual pressure of argon=0.35 atm
The partial pressure of the third gas will be:
[tex]P_t=P_A+P_N+P_H[/tex]
[tex]P_H=P_T-P_A-P_N[/tex]
[tex]P_H=1.25-0.68-0.35=0.22\ atm[/tex]
Hence the partial pressure of the third gas, helium will be [tex]P_h=0.22\ atm[/tex]
To know more about partial pressure follow
https://brainly.com/question/25924351
Answer:
a. .22
Explanation:
Lanthanum emits gamma radiation with a wavelength of 1.24 x 10-31 meters. How
much energy is in this gamma ray?
Answer:
e = 1.60x10⁶J
Explanation:
It is possible to find the energy from the wavelength of the radiation as follows:
e = c*h / λ
Where e is energy in joules
c is light velocity (3.0x10⁸m/s)
h is Planck's constant (6.626x10⁻³⁴Js)
And λ is wavelength in meters (1.24x10⁻³¹m)
e = 3.0x10⁸m/s*6.626x10⁻³⁴Js / 1.24x10⁻³¹m
e = 1.60x10⁶J
Phosphatidic acid is converted into diacylglycerol via _______, which catalyzes removal of a phosphate group.
Answer:
phosphatase
Explanation:
Elements in the periodic table are arranged in order of increasing atomic mass?
True or false
How many moles of C are in the sample?
Answer:
I need more information
Explanation:
what kind of bond is present in HCI
Explanation:
HCL is a binary compound consiting of two atom a Hydrogen and a chlorine atom both of these and non-metallic atom and so will from a covalent bond between them
You spend 272 minutes in chemistry class each week. How many minutes will you spend in
chemistry at the end of the school year if the school year is 36 weeks long?
Answer:
1 week = 272 minutes
36 weeks = 272*36
= 9792 minutes
pls answer ASAP pls & ty aha
when you change the shape of a ball of clay, you are changing the amount of mass , true or false
Answer:
if you change the shape wouldn't it still have the same mass and volume because the density remains the same? so I think it is false
Answer:
False
Explanation:
when you change the shape of the ball of clay, it does not change mass or volume, your not adding more just changng it's form. You can only change it's mass or volume by adding more or breaking it into less.