Hardness and density to figure out a mineral'a classification.
The _______ force is a noncontact force that is created by the movement of an electrical charge. A. centrifugal B. electromagnetic C. resistance D. gravitational
the answer for your question is B. Electromagnetic. because electric charge is the physical property that causes it to experience force when it is placed in a electromagnetic field the electric charge is carried by subatomic particles which causes the movement of the magnetic force
It’s (B) as Electromagnetic force.
ExplanationNon-contact forces are those which act on an object without any physical contact with that object. The electromagnetic force is responsible for the interaction between electrically charged particles. So when electric charges move they produce the electromagnetic field in their surroundings. These fields act as the electromagnetic force for the other charged particles or object present within its sphere.
The following equation shows the correct molecules formed in the reaction, but the products are incorrect. CH4 +202=H20+ CO2 How would you correct the products?
How many hydrogen atoms are in 7.80 mol of ammonium sulfide?
The number of hydrogen atoms that are in 7.80 moles of ammonium sulfide are 3.756 x 10^25 atoms
calculation
Step 1: calculate the moles of H in (NH4)2S
since there are 8 atoms of H in (NH4)2S the moles of
H = 8 x7.80 = 62.4 mole
Step 2: use of Avogadro's law constant to determine the number of H atom
that is 1 mole = 6.02 x10^23 atoms
62.4 moles=? atoms
cross multiplication= [ 62.4 x 6.02 x10^23]/ 1 mole= 3.756 x10^25 atoms
Answer: There are [tex]3.75 \times 10^{25}[/tex] number of H atoms in 7.80 mol of ammonium sulfide.
Explanation:
The formula of ammonium sulfide is [tex](NH_{4})_{2}S[/tex].
There are 2 nitrogen atoms, 8 hydrogen atoms and 1 sulfur atom in one molecule of ammonium sulfide.
Calculate moles of hydrogen atoms as follows.
[tex]8 \times 7.80[/tex] = 62.4
According to Avogadro's number 1 mole contains [tex]6.022 \times 10^{23} atoms[/tex]
Therefore, calculate number of H atoms as follows.
[tex]62.4 \times 6.022 \times 10^{23}[/tex]
= [tex]375.77 \times 10^{23}[/tex]
= [tex]3.75 \times 10^{25}[/tex]
Thus, there are [tex]3.75 \times 10^{25}[/tex] number of H atoms in 7.80 mol of ammonium sulfide.
the atoms of which element will typically form ions
Ions are electrically charged particles, meaning, that whenever any type of atom loses or gains electrons it is forming a new type of structure, or ion.
Metal atoms form postive ions, Non-Metals form negative ions.
The strongest type of bond that can occur between two ions, when they are oppositely charged, are Ionic Bonds. The most commonly known ionic bond is seen in Sodium and Chlorine, which when combined give us NaCl or Sodium Chlorine, aka Salt.
+1 charge = Group 1, Metals
+2 charge = Group 2, Alkali Metals
-1 charge = Group 17, Halogens
Provided is a periodic table marked with the charges for each group.
Is the volume of water measured using the graduated cylinder identical to the volume calculated
The volume of water measured using the graduated cylinder is not exactly identical identical to the volume calculated.
Explanation:Calculated volume is theoretical value calculated from the density and mass of water.
But volume measured in cylinder can contain the personal error of individual.
Because in graduated cylinder volume is measured in a specific way that is:
Place the graduated cylinder on a flat surface and view the height of the liquid in the cylinder with your eyes directly level with the liquid. The liquid will tend to curve downward. This curve is called the meniscus. Always read the measurement at the bottom of the meniscus.Natalie observes these characteristics in the model of an atom. (i) includes positive charge (ii) contains electrons (iii) explains the photoelectric effect (iv) suggests the probable location of electrons Which model is Natalie most likely examining? Bohr model Dalton’s model plum pudding model electron-cloud model
Electron cloud model
Answer:
Electron cloud model
Explanation:
on edge
Which pair of groups will have larger ionic radii compared to their atomic radii after gaining electrons? A Chalcogens and Alkaline Earth Metals B Halogens and Alkali Metals C Alkali and Alkaline Earth Metals D Transition and inner-transition metals E Chalcogens and Halogens
Chlorine (Cl) is in group 17. This element_____.
forms a salt when combined with a metal
has 17 electrons
has 17 electron shells
does not react with other elements
Answer:
has 17 electrons
Explanation:
Chlorine is a halogen that belongs to the 17th group on the periodic table. Chlorine has an atomic number of 17. The atomic number of elements is used in placing and locating elements on the periodic table. In fact, the periodic arrangements of elements is as a result of their atomic numbers.
The atomic number is the number of protons in an atom. This number is the same as the number of electrons in a neutral atom that has not gained or lost any electron.
It is correct to say chlorine has 17 electrons and they occupy 3 electronic shells.
Answer:
Has 17 electrons.
Explanation:
I got this right on a test.
An interaction betweenthe biosphere and atmosphere is A.respiration B.precipitation C.crystallization
I believe an interaction between the biosphere and the atmosphere would be precipitation. Respiration is the process of breathing, and crystallization is the process of, well, crystallizing. :)
Why does a longer life span mean a higher chance of producing offspring?
A longer lifespan typically implies a higher chance of producing offspring because it provides a larger timeframe for successful reproduction. Organisms with extended lifespans have more opportunities to reproduce and can therefore often result in a larger overall number of offspring.
Explanation:In the context of biological evolution, a longer life span generally signifies a higher chance of producing offspring. This is primarily because an organism with a longer life span has a longer period of reproductive viability, i.e., the timespan within which it can reproduce successfully. This increased amount of time for possible reproduction results in more opportunities to produce offspring, thus potentially leading to a larger overall number of offspring throughout the organism's lifetime.
Furthermore, this concept of a longer life span equating to more offspring is often seen in organisms such as turtles and many species of trees. These organisms live for many decades, or even centuries, and during this extended lifespan, they continue to reproduce, which increases their chances of having more offspring compared to organisms with shorter life spans.
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which can be classified as a trace fossil
a.dinosaur bone
b.shrimp burrow
c.imprint of a fern leaf
d.mold of a clam shell
Trace fossils provide us with indirect evidence of life in the past, such as the footprints, tracks, burrows, borings, and feces left behind by animals, rather than the preserved remains of the body of the actual animal itself. so i would say B.
The option that can be classified as a trace fossil is b.shrimp burrow
What is Trace fossils ?A trace fossil is a fossil that contains traces of ancient plants or animals such as footprints, nests, burrows, or excrement in an indirect, visible manner. Ichnology is the field of study of trace fossils.
Body fossils and trace fossils are frequently discovered together in the same area. Instead of the preserved remnants of the actual animal's body, trace fossils offer us indirect proof of life in the past in the form of animal footprints, tracks, burrows, borings, and feces.
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if earth has so much water,why do people in some areas have none to drink.Explain?
Even though our planet has a lot of water, some areas don't experience rain much and they aren't close to large bodies of water.
So in those areas they don't get to drink much water, because there isn't much available.
We may have a unlimited supply of water, but in other countries they might not. Hot, humid area's that don't experience rain won't have any water to drink, so they go to extreme measures and drink from cactus, or eat cactus fruit.
Also, most of the water on earth isn't drinkable which can cause sickness.
An atom with 16 protons must be:
A. oxygen
B. selenium
C. sulfur
D. can't tell
C. Sulfur
Is the answer.
your answer is sulfur because the atomic number is the same as protons!
plz mark as brainliest
Which chemical equation represents a precipitation reaction?
A.
Mg(ClO3)2(aq) + 2HCl(aq) → MgCl2(aq) + 2HClO3(aq)
B.
AlBr3(aq) + 3LiI(aq) → AlI3(aq) + 3LiBr(aq)
C.
NH4NO3(aq) + HBr(aq) → NH4Br(aq) + HNO3(aq)
D.
Li2CO3(aq) + FeCl2(aq) → 2LiCl(aq) + FeCO3(s)
Answer:- D. [tex]Li_2CO_3(aq)+FeCl_2(aq)\rightarrow 2LiCl(aq)+FeCO_3(s)[/tex]
Explanations:- In chemical equations, (aq) stands for aqueous, (l) stands for liquid, (g) stands for gas and (s) stands for solid. In double replacement reactions, (aq) means soluble and (s) means insoluble that is precipitate.
Looking at all the equations, it is only the last equation that has a solid product and so this is the only precipitation reaction. A precipitate for Iron(II)carbonate is formed in it.
Answer:
The correct answer is
D. Li2CO3(aq) + FeCl2(aq) → 2LiCl(aq) + FeCO3(s)
Which of the following is an example of a galvanic cell? A. A battery that has a negative voltage B. A cell with a nonspontaneous redox reaction C. A battery that produces electricity D. A cell that has energy added to it
Answer:
A battery that produces electricity
Explanation:
Galvanic cell is a battery which converts chemical energy to electrical energy.
In galvanic cell two half cells work, one is cathodic and other is anodic.
At cathode reduction takes place and at anode oxidation takes place.
Due to this redox reaction some voltage is generated which is known as emf of the cell.
The EMF of the cell calculated from the difference of reduction potential of cathode and anode.
The cell will work if the emf of the cell is positive.
If emf of the cell is positive it means that cell is spontaneous,
Free energy change = ΔG°= -nFE°
thus a positive values of E° corresponds to negative value of ΔG°, and hence a spontaneous reaction.
Where E° is emf of the cell
What is a control in a scientific experiment
Hey there!
In a scientific experiment, there are three types of variables: dependent, independent, and control.
Independent variables are the variables that are changed and doesn't depend on another.
Dependent variables are the variables that are depending on the independent variable. When the independent variable changes, it affects the dependent variable.
Control variables are the variables that are kept the same throughout the entire experiment. These don't change at all.
Hope this helps!
Is apple juice a homogeneous mixture or a heterogeneous mixture
Answer: Apple juice is a homogeneous mixture.
Explanation:
There are two types of mixtures:
Homogeneous mixtures are defined as the mixtures that appears uniformly throughout the solution and the particle size or shapes are not different.Heterogeneous mixtures are defined as the mixtures which appears non-uniformly throughout the solution and the particle size or shapes are also different.Apple juice is a homogeneous mixture because the juice appears uniform throughout and no phases between the particles is seen.
Hence, apple juice is a homogeneous mixture.
Apple juice is a homogeneous mixture, as its composition is uniform throughout, much like a commercial sports drink. This contrasts with heterogeneous mixtures like oil and vinegar salad dressing which have varying compositions.
Explanation:Apple juice is considered a homogeneous mixture, also known as a solution. This type of mixture consists of substances with a composition that is uniform throughout. To illustrate, consider a commercial sports drink, another example of a homogeneous mixture. Its composition is the same in every part of the drink, just like how apple juice has a uniform consistency and taste throughout, irrespective of where you sample it from within the jug or glass. This is unlike a heterogeneous mixture, where the composition varies from point to point, like in oil and vinegar salad dressing.
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What is the term for substances containing atoms of two or more different elements
A. Mixtures
B. Atoms
C. Molecules
D. Compounds
What did Robert Boyle teach in the 1600s?
He taught about That matter was made up of atoms
~Hope that helped!
~Izzy
Robert Boyle taught inverse relationship between volume and pressure of gases also known as pressure law in 1600s.
In 1600s Robert Boyle taught his law of inverse relationship between volume and pressure of gases.
Robert Boyle states that at a fixed mass of a gas and constant temperature, the pressure of the gas is inversely proportional to its volume.
The law is written as follows;
P₁V₁ = P₂V₂
where;
P is the pressure of the gasV is the volume of the gasThus, we can conclude that Robert Boyle taught inverse relationship between volume and pressure of gases also known as pressure law in 1600s.
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Complete and balance each of the following equations for gas evolution reactions. (Express your answer as a chemical equation. Identify all of the phases in your answer) HClO4(aq)+K2CO3(aq)—->
Please help! And with parts B and C.
1) Balanced chemical reaction:
2HClO₄(aq) + K₂CO₃(aq) → K₂CO₃(aq) + CO₂(g) + H₂O(l).
2) Balanced chemical reaction:
HC₂H₃O₂(aq) + LiHSO₃(aq) → LiC₂H₃O₂(aq) (aq) + SO₂(g) + H₂O(l).
3) Balanced chemical reaction:
(NH₄)₂SO₄(aq) + Ca(OH)₂(aq) → CaSO₄(s) + 2NH₃(g) + 2H₂O(l).
CaSO₄ (calcium sulfate) is insoluble in water.
1) Aqueous perchloric acid reacts with aqueous potassium carbonate to form aqueous potassium perchlorate, carbon dioxide gas and water.
2HClO₄(aq) + K₂CO₃(aq) → 2KClO₄(aq) + CO₂(g) + H₂O(l).
2) Aqueous acetic acid reacts with aqueous lithium bisulfite to form aqueous lithium acetate, sulfur dioxide gas and water.
HC₂H₃O₂(aq) + LiHSO₃(aq) → LiC₂H₃O₂(aq) + SO₂(g) + H₂O(l).
3) Aqueous ammonium sulfate reacts with aqueous calcium hydroxide to form a white precipitate of calcium sulfate, ammonia gas and water.
(NH₄)₂SO₄(aq) + Ca(OH)₂(aq) → CaSO₄(s) + 2NH₃(g) + 2H₂O(l).
What is the pH of a 0.65 M solution of pyridine, C5H5N?
Hey there!
The pH of a weak base (in this case, pyridine is a weak base) is calculated by using the weak base equation, and then solving it.
C5H5N; Kb= 1.7 x 10⁻⁹
pH = -log [H⁺]
we can also say that pH = 14 + log [OH⁻]
Plugging into the weak base equation, we know that Kb = [OH⁻][BH⁺] / [B]
This can be solved using an ice chart, which will then simplify to :
Kb = [x][x] / [0.50-x]
We can assume that x is very small in comparison to the 0.5 , so we consider it zero.
Then plug in and solve for x. 1.79 *10-9 = x² / 0.5
x = 2.992 * 10⁻⁵
ince X is equal to the [OH⁻] concentration, we can plug it into the second pH equation, and get the pH!
pH = 14+ log 2.99 * 10⁻⁵
pH = 9.48
Hope that helps!
The pH of a 0.65 M solution of pyridine (C₅H₅N) is 9.52.
The equation for the protonation of the base pyridine is the following:
C₅H₅N + H₂O ⇄ C₅H₅NH⁺ + OH⁻ (1)
The constant of the above reaction is:
[tex] K_{b} = \frac{[C_{5}H_{5}NH^{+}][OH^{-}]}{[C_{5}H_{5}N]} = 1.7 \cdot 10^{-9} [/tex] (2)
To calculate the pH of the solution we need to use the following equation:
[tex] pH + pOH = 14 [/tex]
[tex] pH = 14 - pOH = 14 - (-log[OH^{-}]) = 14 + log[OH^{-}] [/tex] (3)
So, we need to find the concentration of the OH⁻ ions. Since pyridine is a weak base, at the equilibrium we have (eq 1):
C₅H₅N + H₂O ⇄ C₅H₅NH⁺ + OH⁻
0.65 - x x x
After entering the values of [C₅H₅N] = 0.65-x, [C₅H₅NH⁺] = x, and [OH⁻] = x, into equation (2) we can find the concentration of OH⁻:
[tex] 1.7 \cdot 10^{-9} = \frac{[C_{5}H_{5}NH^{+}][OH^{-}]}{[C_{5}H_{5}N]} = \frac{x*x}{0.65 - x} [/tex]
[tex] 1.7 \cdot 10^{-9}(0.65 - x) - x^{2} = 0 [/tex]
Solving the above quadratic equation for x, we have:
[tex] x_{1} = -3.32 \cdot 10^{-5} M [/tex]
[tex] x_{2} = 3.32 \cdot 10^{-5} M [/tex]
We can calculate the pH, after taking the positive value, x₂, (concentrations cannot be negative) and entering into equation (3):
[tex] pH = 14 + log[OH^{-}] = 14 + log(3.32 \cdot 10^{-5}) = 9.52 [/tex]
Therefore, the pH of the solution of pyridine is 9.52.
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how many grams of oxygen is needed to completely react with in a 9.30 moles of aluminum
Answer:
223
Explanation:
I had the same problem and put 223, it was correct.
How many moles of water were lost if the amount of water lost was 0.294 grams?
0.01631973355 is your answer. Have a great day and hope this helps!!!
To determine the moles of water lost when 0.294 grams evaporated, divide the mass by the molar mass of water, which is 18.015 g/mol, yielding approximately 0.0163 moles.
To find out how many moles of water were lost when 0.294 grams of water evaporated, you can use the molar mass of water. The molar mass of water (H₂O) is 18.015 g/mol. Therefore, you can calculate the number of moles by dividing the mass of the evaporated water by the molar mass of water.
Mass of evaporated water = 0.294 grams
Molar mass of water (H₂O) = 18.015 g/mol
Number of moles = Mass of water / Molar mass of water
Number of moles = 0.294 g / 18.015 g/mol
Number of moles = 0.0163 moles (approximately)
Therefore, 0.294 grams of water corresponds to approximately 0.0163 moles.
What type of charge does a neutron have
Hey there!
A neutron is found in the nucleus of an atom. All neutrons have a neutral charge while protons have a positive charge, and electrons have a negative charge.
I hope this helps! Have a sparking day!
A neutron has no charge and is electrically neutral.
The neutron is an electrically neutral subatomic particle with no charge. It is neither positively charged nor negatively charged.
This makes it different from the proton, which carries a positive charge, and the electron, which carries a negative charge.
Neutrons are found in the nucleus of an atom along with protons.
Their mass is slightly greater than that of a proton.
For example, the neutron has a mass of 1.0087 atomic mass units (amu) while the proton has a mass of 1.0073 amu.
What substance is acting as the Brønsted-Lowry acid in the following forward reaction? H2SO4 + H2O yields H3O+ + HSO4−
In the reaction H2SO4 + H2O → H3O+ + HSO4− the Bronsted-Lowry acid is H2SO4, which donates a proton to H2O to form H3O+ and its conjugate base HSO4−.
Explanation:In the forward reaction H2SO4 + H2O → H3O+ + HSO4-, the substance acting as the Bronsted-Lowry acid is H2SO4. According to the Bronsted-Lowry definition, an acid is a substance that can donate a proton (a hydrogen ion) to another substance.in this case, H2SO4 donates a proton to H2O, forming H3O+ (the hydronium ion) and its conjugate base HSO4-. Thus, the Bronsted-Lowry acid in this reaction is H2SO4.
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The mass of an object Is 45 kilograms. It’s weight on earth is—— newtons, and it’s weight on the moon is ——newtons. Gravitational force is 9.8m/s2 on earth and 1.6m/s2 on the moon
Answer:
The weight of the object on earth =441N
Weight of the object on moon = 72N
Explanation:
Weight of a body is the product of its mass and acceleration due to gravity. Acceleration due to gravity varies between planetary bodies. The acceleration due to gravity on earth is 9.8 m/s² while on moon is 1.6m/s² and it goes different for others too.
Weight = Mass * acceleration due to gravity
Weight(e) = weight on earth
Weight (m) = weight on moon
Weight(e) = 45 * 9.8 = 441N
Weight (m) = 45 * 1.6 = 72N
Weight of a body is measured in a unit called Newton(N)
The weight of a 45-kilogram object on Earth is 441 newtons, on the Moon the object's weight is 72 newtons. Weight varies by location due to the differences in gravitational force.
Explanation:The weight of an object is calculated by multiplying the object's mass by the gravitational force. The standard formula to calculate weight is w=mg where 'w' represents weight, 'm' is mass, and 'g' is the acceleration due to gravity. On earth, the gravitational force is about 9.8 m/s², while on the moon this force dramatically decreases to about 1.6 m/s².
Using this formula, we can calculate the weight of an object with a mass of 45 kilograms on Earth and the Moon. On earth, the weight would be 45 kg x 9.8 m/s² which gives us a result of 441 newtons. While on the moon, the weight would be 45 kg x 1.6 m/s², resulting in 72 newtons.
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Does H₂ have a coefficient?
Yes or No
Is Does not have a Coefficient so it would be No
Drag the tiles to the correct boxes to complete the pairs. Match each type of model to the corresponding example.
conceptual model
pairs:
physical model
virtual model
mathematical model
pair with:
an equation that shows how an object’s acceleration relates to its mass
several balls and sticks glued together to represent a molecule
a computer program that shows all possible planetary orbits
a diagram that shows the shape of the magnetic field around an object
Answer:
Conceptual model - a diagram that shows the shape of the magnetic field around an object
Physical model - several balls and sticks glued together to represent a molecule
Virtual model - a computer program that shows all possible planetary orbits
Mathematical model - an equation that shows how an object’s acceleration relates to its mass
Explanation:
happy to help :^)
The correct pairings of conceptual models with their corresponding examples:
Physical model: several balls and sticks glued together to represent a molecule.Virtual model: a computer program that shows all possible planetary orbits.Mathematical model: an equation that shows how an object’s acceleration relates to its mass.Conceptual model: a diagram that shows the shape of the magnetic field around an object.What is the modelA physical model is a copy or imitation of something that helps us see and understand its features, how it behaves, or its design. Physical models are objects that you can touch and are in three dimensions. They can be similar to a smaller version of a building or simple objects like balls and sticks that represent molecules.
A virtual or computer-made picture of something that you can use to study and interact with. Virtual models are frequently used in simulations and computer programs to imitate real-life events or situations. An example is a computer program that displays how planets move in their paths around the sun.
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Balance and a graduated cylinder are used to determine the density of a mineral sample to sample has a mass of 14.7 g and a volume of 2.2 cm3 What is the density of the mineral sample
Hey there!:
Mass = 14.7 g
Volume = 2.2 cm³
Density = ?
Therefore:
D = m / V
D = 14.7 / 2.2
D = 6.67 g/cm³
Answer J
Hope that helps!
By definition of density, the correct answer is option J: the density of the mineral sample is 6.7 [tex]\frac{g}{cm^{3} }[/tex].
In first place, you have to know that density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. In other words, density is an intensive property of matter defined as the ratio of an object's mass to its volume.
For its calculation, the density is defined as the quotient between the mass of a body and the volume that occupies:
[tex]density=\frac{mass}{volume}[/tex]
In this way, substances with a higher density have a greater quantity of matter in a certain volume than substances with a lower density.
In this case, you know:
mass= 14.7 gvolume= 2.2 cm³Replacing in the definition of density:
[tex]density=\frac{14.7 g}{2.2 cm^{3} }[/tex]
Solving:
density= 6.7 [tex]\frac{g}{cm^{3} }[/tex]
In summary, the correct answer is option J: the density of the mineral sample is 6.7 [tex]\frac{g}{cm^{3} }[/tex].
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brainly.com/question/952755?referrer=searchResults brainly.com/question/1462554?referrer=searchResultsHow many grams of F are in 405 grams of CaF2?
Answer: 197 grams
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}=[/tex]
Given mass = 405 g
Molar mass = 78.07 g/mol
[tex]\text{Number of moles}=\frac{405g}{78.07g/mol}=5.19moles[/tex]
1 mole of [tex]CaF_2[/tex] contains = 2 moles of fluorine
5.19 mole of [tex]CaF_2[/tex] contains = [tex]\frac{2}{1}\times 5.19=10.38moles[/tex] of fluorine
Mass of flourine =[tex]moles\times molar mass=10.38\times 19=197g[/tex]
Thus 197 grams of F are in 405 grams of [tex]CaF_2[/tex] .