The chemical formula for the compound magnesium perchlorate is Mg(ClO₄)₂
Magnesium perchlorate or Mg(ClO₄)₂ is an ionic compound.
Perchlorate here is an anion which is represented by ClO₄⁻. Perchlorate is a polyatiomic anion, where one Cl atom is bonded to four O atoms.
The magnesium cation is represented by Mg²⁺
So one Mg²⁺ cation combines with two ClO₄⁻ anion to form one molecule of Mg(ClO₄)₂
Answer: Mg(ClO₄)₂
Explanation: Correct on PLATO.
Scientist are always learning new things. which of the following shows how scientist use observations to gain new understanding about the world?
A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.
B. Scientists hope to learn more about how many stars are in space.
C. Scientists are familiar with some galaxies, but they do not know how many galaxies exist.
D. Scientist wonder if other plants can support life, and some scientist wonder if there are aliens.
Answer:
A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.
Explanation:
As can be seen from the options only first option shows an observation. Here the scientists observed the wobbling of the stars and through that they deduced that there will be planets orbiting around that star. This deductions stands true as the gravity of the planet affects the motion of the star as well. Other options do not show such instances.
Why does a metal spoon left on a bowl of hot soup get warm?
Answer:
The spoon inside the soup bowl heats up due to heat conduction.
Conduction is one of the types of thermal transfer that allows heat to be transmitted from a hot object to a cold one. (from soup bowl to spoon)
In conduction there is no matter transport. What is transferred is heat, which is a form of energy, corresponding to the increase in the kinetic energy of the atom.
Thermal conduction involves the propagation of heat by contact.
define density and erute the formula and units for calculating density
Answer:
m/v
Explanation:
m= mass
v= volume
mass divided by volume
Which state of matter does lightning represent?
Solid
Liquid
Gas
Plasma
Plasma
Explanation:Plasma is the stuff of lightning, flame and stars. Plasma is neither solid, liquid nor gas plasma is a fourth state of matter.
Plasma is when the electrons are "freed" from their host atoms for a short time, due to high temperatures. Fire is plasma, it responds to electric fields. Lightning is also plasma.
What does Earth's hydrosphere include? the water on Earth the hard outer part of Earth the layer of gases surrounding Earth the living things on Earth
Answer: The water on earth.
Explanation:
The hydrosphere is the sphere of the earth which includes water bodies like ocean, river, lakes, ponds, estuaries, and groundwater. The water in the water bodies is replenished by the water cycle.
helpppppp meeeee pleaasssss
Does a bottle of acetic acid contain a solid or a liquid on a chilly morning with the window open and the laboratory at 10 ∘ C ?
Answer is: a bottle of acetic acid contains a solid.
Acetic or ethanoic acid (CH₃COOH) when undiluted is called glacial acetic acid.
Glacial acetic acid has freezing point (melting point) around 16.6°C, so it will be at solit state.
Vinegar is mixture of acetic acid (CH₃COOH) and water (H₂O). Vinegar is colourless liquid with sour taste and pungent smell, freezing point of the vinegar is lower than glacial acetic acid.
Acetic acid dissociate in aqueous solution to form hydrogen ions (H⁺) and acetic anion (CH₃COO⁻).
Balanced chemical reaction (dissociation):
CH₃COOH(aq) ⇄ CH₃COO⁻(aq) + H⁺(aq).
Food spoils because of chemical reactions. Many types of spoilage occur because of the actions of microorganisms, such as bacteria. These organisms, like all organisms, rely on chemical reactions within their bodies to carry out their life processes.
Based on this information, what is the most likely reason that refrigerating most foods reduces the rate at which they spoil?
The lower temperature causes foods to expand, increasing the distances between molecules and reducing the reaction rate.
The lower temperature reduces molecule speeds, reducing the number of effective collisions.
The lower temperature causes food to contract, increasing the distances between molecules and reducing the reaction rate.
Answer: The lower temperature reduces molecule speeds, reducing the number of effective collisions.
Almost all food spoils. Most of the spoilage is because of the enzyme activity of microorganisms. Bacteria, which is an example of microorganism, grows rapidly at room temperature or higher temperatures mainly ranging between 40 degrees F to 140 degrees F.
The most commonly used strategy to minimize the rate of food spoilage is to keep it in a cool environment i.e. by refrigerating it. The lower temperature provided to the food slows down the movement of molecules and the number of collisions between them, thus slowing down the rate of enzyme activity.
Answer:
The lower temperature reduces molecule speeds, reducing the number of effective collisions.
Explanation:
If a temperature increase from 10.0 ∘C to 22.0 ∘C doubles the rate constant for a reaction, what is the value of the activation barrier for the reaction?\
The activation barrier for the reaction can be determined by comparing the rate constants at two different temperatures using the Arrhenius equation. In this case, the activation barrier is approximately 45.1 kJ/mol.
Explanation:The activation barrier for a reaction can be determined by comparing the rate constants at two different temperatures. In this case, if the rate constant doubles when the temperature increases from 10.0 °C to 22.0 °C, it means that the reaction rate doubles. The relationship between reaction rate and temperature is given by the Arrhenius equation: k = Ae-Ea/RT, where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the ideal gas constant, and T is the temperature in Kelvin.
When the temperature increases from T1 to T2, we can use the ratio of the rate constants to find the difference in activation energy:
Ea = -R(ln(k2/k1))/(1/T2 - 1/T1)
In this case, if we assume that the pre-exponential factor remains constant, we can substitute the given information into the equation to find the activation energy:
Ea = -8.314 J/mol K (ln(2))/(1/(22+273) - 1/(10+273))
Ea ≈ 45.1 kJ/mol
list four physical properties of toothpaste
(PLEASE HELP ASAP)
To demonstrate the arrangement of atoms in solids, a teacher tapes off a square section on the classroom floor. How should the students modeling as atoms stand or move in the taped-off section?
a. They should leave some vacant space and move around one another.
b. A few students should move about holding hands in one half of the space.
c. They should all squeeze close together so that there is no vacant space.
d. A few students should run randomly in the entire space within the section.
Answer: Option (c) is the correct answer.
Explanation:
In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.
Hence, in solid substances the molecules have low kinetic energy. This means that there is very less space between the molecules of a solid substance.
Whereas in liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy and some vacant space between each molecule.
In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions and wide spaces between each molecule.
Thus, we can conclude that when the students modeling as atoms stand or move in the taped-off section then they should all squeeze close together so that there is no vacant space.
If you add water to a 15.00 mL solution of 3.22 M CaCl2 (MM=110.98 g/mol) in order to create a solution that is 15.00% CaCl2 by mass, what is the final mass of the new solution. The density of water is exactly 1.00 g/mL. Assume that the density of the CaCl2 solution is also exactly 1.00 g/mL.
The mass of the new solution is 35.7 g.
Step 1. Calculate the moles of CaCl₂ in the first solution.
[[tex]\text{Moles of CaCl}_{2} = \text{0.015 00 L solution} \times \frac{\text{3.22 mol CaCl}_{2}}{\text{1 L solution }} = \text{0.048 30 mol CaCl}_{2}\\[/tex]
Step 2. Calculate the mass of CaCl₂.
[tex]\text{Mass of CaCl}_{2} = \text{0.048 30 mol CaCl}_{2} \times \frac{\text{110.98 g CaCl}_{2} }{\text{1 mol CaCl}_{2} } = \text{5.360 g CaCl}_{2} \\[/tex]
Step 3. Calculate the mass of the new solution.
[tex]\text{Mass of solution }= \text{5.360 g CaCl}_{2} \times \frac{\text{100 g solution }}{\text{15.00 g CaCl}_{2} } = \textbf{35.7 g solution} \\[/tex]
What type of map should have a north arrow ,key , and map scale?
A political map is a kind of map which contains a north arrow, key and a map scale.
This kind of map usually indicates the governmental boundaries of countries, states, or any counties,
And, they give information about the location of major cities, also they usually include significant bodies of water.
Answer:
Political maps contains north direction, key and scale of map
Explanation:
Map is the two-dimensional representation of the earth showing its various features and locations along with proper latitude and longitude. It has different types of maps, of which the physical maps are widely used. Political maps are those maps in which the countries are separated by distinct boundaries. It is widely used to determine the location of any particular place on earth. It highlights the countries with different colors with various colors excluding blue because the blue color is used to represent the water bodies on earth.
These political maps are comprised of keys, the north direction and the scale of the map.
A teniss ball has more mass than a gold ball because
Whhhhaaaatttt????? A gold ball has more mass because it is a solid and we all know that gold is sssuuuuuuuuppppppeeerr heavy...
So a tennis ball does not have more mass because it is not heavy... I don't know how to say it but it is a solid... but not heavier.
Hope this helps....
Whay type of ion might sodium form?
Which of the following would not cause an increase in the pressure inside a sealed container of neon gas?
The pressure in a sealed container means the volume of container is fixed
so we cannot change the volume of container hence gas
The other factors which can affect the pressure are
a) moles of gas : if we increase the moles of gas the pressure of gas will increase
b) Temperature: if we increase the pressure of gas the pressure of gas will increase due to increase in kinetic energy
So the following cannot increase pressure
a) decrease in moles of gas
b) decrease in temperature of gas
Hey there! Your answer is C. Increasing the volume of the container
This is because the container is already sealed, so the volume is fixed.
A compound has an empirical formula of CH2 and a molar mass of 70.15. What is its molecular formula?
Cyclopentane (C5H10)
Explanation:The molar mass of CH2 is about 14.3, Since empirical is a ratio just divide the given molar mass by the molar mass of the empirical. 70.15/14.3=5 So now multiple everything by 5 in the empirical equation.
So, a compound that has an empirical formula of CH2 and a molar mass of 70.15 will have molecular formula of" C5H10".
Is mass conserved in a chemical reaction?
yes i think so i think
No, mass is not conserved in a chemical reaction.
Select the words that correctly fill in the blanks for this statement:
The p sublevel has ________ orbitals that are ________-shaped.
three, dumbbell
three, spherical
five, dumbbell
five, spherical
The correct answer is option A. Three, dumbbell.
The p sublevel has __three_orbitals that are _dunmbbell_-shaped.
The three orbitals of the p sublevel are oriented in three directions along the x, y and Z axis. The orbitals are called px, py and pz. Each p orbital can have a maximum of 2 electrons. Since there are three p orbitals, the p sublevel can have a maximum of 6 electrons.
Answer : The correct option is, three, dumbbell.
Explanation :
As we know that there are many sub-levels which are s, p, d, f, g and so on. The sub-level are oriented in three directions along the x, y and z axis.
The 's' sub-level has one orbital that are spherically shaped.
The 'p' sub-level has three orbitals [tex](p_x,p_y,p_z)[/tex] that are dumbbell shaped.
The 'd' sub-level has five orbitals [tex](d_{xy},d_{xz},d_{yz}d_{z^2},d_{x^2-y^2})[/tex] that are double-dumbbell shaped.
The 'f' sub-level has seven orbitals [tex](f_{x(x^2-3y^2)},f_{y(x^2-3z^2)},f_{y(3x^2-3y^2)},f_{xz^2},f_{z^3},f_{yz^2},f_{xyz})[/tex] that are complex flower shaped.
Hence, the 'p' sub-level has three orbitals that are dumbbell shaped.
You bought a magazine for $5 and four erasers. You spent a total of $25. How much did each eraser cost?
An AM radio station broadcasts news at 650 kHz. What is the frequency of this radio wave in hertz?
650 KHz means 650 thousand hertz = 650,000 Hertz. If it were an FM station, say at 92.3 MHz, that would be 92.3 Million Hertz or 92,300,000 Hertz. MHz means mega hertz. Mega = Million.
The equivalency of the frequency of the radio wave in Hz is [tex]650 \times 10^3 \ Hz[/tex].
The frequency of a wave is number of cycles of the wave at a given period of time. The frequency of the wave is directly proportional to the speed of the wave and inversely proportional to the wavelength.
[tex]v = f \lambda[/tex]
where;
v is the speed of the wave
f is the frequency of the wave
λ is the wavelength
The given frequency of the wave = 650 kHz
The equivalency of the frequency of the radio wave in Hz is calculated as follows;
[tex]f = 650 \times 10^3 \ Hz[/tex]
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Balancing a redox equation by the half-reaction method is based on which of the following actions? A. the transfer of atoms B. the transfer of electrons C. the transfer of hydroxide ions D. the transfer of oxygen molecules
Pretty sure it's the transfer of electrons.
Answer: Option (B) is the correct answer.
Explanation:
A chemical reaction in which there is transfer of electrons between any two species is known as a redox reaction.
For example, [tex]Cu(s) + 2Ag^{+}(aq) \rightarrow Cu^{2+} + 2Ag(s)[/tex]
Oxidation-half reaction: [tex]Cu(s) \rightarrow Cu^{2+} + 2e^{-}[/tex]
Reduction-half reaction: [tex]2Ag^{+}(aq) + 2e^{-} \rightarrow 2Ag(s)[/tex]
Thus, we can conclude that balancing a redox equation by the half-reaction method is based on action of transfer of electrons.
Which is a characteristic of an amorphous solid?
1. made up of crystals
2. particles arranged in a repeating pattern
3. has a distinct melting point
4. becomes softer as temperature rises
4. becomes softer as temperature rises
Explanation:An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Solids and liquids are both forms of condensed matter; both are composed of atoms in close proximity to each other.
An amorphous solid becomes softer as temperature rises, which is distinct from crystalline solids; they do not have a sharp melting point but gradually soften with increasing temperature. Option 4 is correct.
An amorphous solid is a type of solid that lacks a well-defined, long-range order or repeating pattern in its internal structure. Unlike crystalline solids, which have sharp melting points due to identical forces holding each atom or molecule in a precise arrangement, amorphous solids do not have a distinct melting point. Instead, they soften over a range of temperatures as heat is applied.
When an amorphous material such as glass or plastic is heated, the weakest intermolecular attractions break first, leading to a gradual softening of the material. As the temperature increases, stronger attractions also begin to break. This results in amorphous solids becoming softer with the rise in temperature, which is a characteristic distinct from crystalline solids.
Therefore, the correct answer to the question is that an amorphous solid becomes softer as temperature rises.
Given:
CH4+2O2 - CO2 + 2H2O
in chemical reaction, if 10 moles of H2O are produced, ___?___ moles of CO2 are also produced.
Final answer:
If 10 moles of H2O are produced in the given chemical reaction, CH4 + 2O2 → CO2 + 2H2O, then 5 moles of CO2 are also produced, based on the stoichiometry of the balanced equation.
Explanation:
The given chemical reaction is CH4 + 2O2 → CO2 + 2H2O. This reaction represents the combustion of methane (CH4) to produce carbon dioxide (CO2) and water (H2O).
According to the balanced equation, for every mole of CH4 that reacts, one mole of CO2 is produced and two moles of H2O are produced.
Hence, if 10 moles of water are produced in the reaction, that means that 10 moles of H2O are the result of 5 moles of CH4 completing the reaction since the ratio is 1:2. Therefore, 5 moles of CO2 are also produced, as the ratio of CH4 to CO2 is 1:1.
Answer sixteen please
Which best describes the primary function of the nervous system in keeping the body in homeostasis
HEY BUDDY THE ANSWER IS
It processes the environment and sends out signals.
The primary function of the nervous system in keeping the body in homeostasis is to monitor and regulate internal conditions through negative feedback mechanisms.
Explanation:The primary function of the nervous system in keeping the body in homeostasis is to monitor and regulate internal conditions. This is done through a process called negative feedback. When there is a change in the internal environment, the nervous system detects the change and sends signals to various organs and tissues to make adjustments and return the body to its optimal state.
For example, if the body temperature starts to rise, sensors in the skin and internal organs send signals to the brain. The brain then sends signals to the sweat glands to produce sweat and cool down the body. This helps maintain a stable body temperature, which is necessary for the proper functioning of the body.
In summary, the nervous system plays a crucial role in maintaining homeostasis by constantly monitoring and regulating internal conditions through negative feedback mechanisms.
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It is illegal for minor to __________
Alicia cashed her paycheck and used half her earnings to take 3 friends to dinner. She spent $42.15 on dinner and she brought home more than $20.00. write a inequality to represent the situation, using x to represent the amount of alicia check.
Alicia took half of her salary which is $42.15. So the total amount of her salary is $84..30.
Therefore, x-$42.15 ≥ $20.00
$84.30/x ≥$62.15
The amount of Alicia check is [tex]X[/tex].
Amount spent on dinner = [tex]\$42.15[/tex] (given)
Amount brought to home = more than [tex]\$20.00[/tex] (given)
The above information can be written in equation as:
[tex]X - \$42.5 > \$20.00[/tex]
Solving for [tex]X[/tex] as:
[tex]X > \$20.00 + \$42.15[/tex]
[tex]X > \$62.15[/tex]
Hence, inequality to represent the situation is [tex]X > \$62.15[/tex].
Is frying an egg chemical or physical change
It is a chemical change
Answer:
Chemical change
Explanation:
Combustibility is pretty much frying and egg and combustibility is a chemical change so :p
One example of a chemical change is filtering a mixture, burning wood, boiling water, or crushing a can?
Burning wood is a chemical change.
Among the given options, burning wood is an example of a chemical change as it leads to the formation of new substances, namely, carbon dioxide, water vapor, and ash.
Explanation:The correct option for an example of a chemical change among the given choices is burning wood. Chemical change involves forming new substances with new properties. In the process of burning wood, wood (cellulose) reacts with oxygen in the air to form carbon dioxide, water vapor, and ash, which are completely different substances from the original wood and oxygen. The other three options, filtering a mixture, boiling water, and crushing a can, are physical changes because they do not result in any new substances being formed; they only change the state, shape, or appearance of the substance.
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