1) The answer is: C. heterogeneous mixture.
Heterogeneous mixture is not uniform in composition.
This substance is not element or compound, because different components could be observed in the substance.
Pure substance is made of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.
For example, aluminium is an element and ammonia is compound.
This substance is not a homogeneous mixture, because different samples of the substance appeared to have different proportions of the components.
2) The answer is: A. It represents the beliefs of most scientists.
Consensus is general agreement, but not necessarily unanimity.
Consensus is achieved through communication at conferences, the publication process, replication and peer review.
For example, 97 percente of scienties agree that climate warming trends over the past century are extremely likely due to human activities.
What is the nuclear binding energy of carbon-12
This missing mass is known as the mass defect, and represents the binding energy of the nucleus. The binding energy in the carbon-12 atom is therefore 0.098931 u * 931.5 MeV/u = 92.15 MeV.
Consider the balanced equation below.
4NH3 + 3O2  2N2 + 6H2O
What is the mole ratio of NH3 to N2?
2:4
4:2
4:4
7:2
Consider the balanced equation below.
4NH3 + 3O2  2N2 + 6H2O
What is the mole ratio of NH3 to N2? 4:2
Answer:
Mole ratio NH3: N2 = 4:2
Explanation:
The given equation depicts the reaction between ammonia (NH3) and oxygen (O2) to form nitrogen (N2) and water (H2O). The balanced equation is:
[tex]4NH_{3} +3 O_{2} \rightarrow 2 N_{2}+ 6H2O[\tex]
Based on the reaction stoichiometry:
4 moles of NH3 combines with 3 moles of O2 to form 2 moles of N2 and 6 moles of H2O
Thus the mole ratio of NH3: N2 = 4:2 (or 2:1)
PLEASE HELP ME WITH ATOMS AND DALTON I BEG YOU
Which of the following statements is FALSE about Dalton's atomic theory?
1. Scientists later improved parts of Dalton's atomic theory.
2. Parts of the theory are no longer accepted as correct.
3. It was the first theory to propose that matter was made of tiny indestructible pieces of matter.
4. It was based on experimental evidence provided from leading scientists of that time.
I think that the answer is either 3, because wouldn't Democritus be the first person to propose tiny indestructible pieces of matter? or 4, because i don't think there were machines available to be able to test his theory with experiments. please help!
Dalton's atomic theory was not the first to propose tiny indestructible pieces of matter, and it was not based on experimental evidence from leading scientists.
Explanation:The false statement about Dalton's atomic theory is number 3. While Dalton's theory was significant in proposing that matter consists of tiny indestructible pieces, it was not the first theory to do so. The idea of atoms had been previously suggested by the Greek philosopher Democritus. Dalton's theory also did not incorporate experimental evidence from leading scientists of his time, so statement 4 is also false. Despite these inaccuracies, the other two statements are true: scientists have indeed improved parts of Dalton's atomic theory, and some parts of the theory are no longer accepted as correct.
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A compound is found to be 38.76% calcium, 19.97% phosphorous and 41.28% oxygen. What is the empirical formula for this compound?
The empirical formula is Ca₃P₂O₈.
Assume that you have 100 g of the compound.
Then you have 38.76 g Ca, 19.97 g P, and 41.28 g O.
Now, we must convert these masses to moles and find their ratios.
If the number in the ratio are not close to integers, you multiply them by a number that makes them close to integers.
From here on, I like to summarize the calculations in a table.
Element Mass/g Moles Ratio ×2 Integers
Ca 38.76 0.967 07 1.4998 2.9995 3
P 19.97 0.644 82 1 2 2
O 41.28 2.580 0 4.0011 8.0023 8
The empirical formula is Ca₃P₂O₈.
The empirical formula for this compound in the given case would be - Ca₃P₂O₈ or [tex]Ca_3(PO_4)_2[/tex].
Let assume the given compound is 100g than the molar quantities of each element.
=> Moles of calcium
=
= 0.967 mol
=> Moles of phosphorus
= [tex]\frac{19.97g}{31.0g}[/tex]
= 0.644 mol
=> Moles of oxygen
=
= 2.58 mol
Multiply integers of molecules by a number that makes them close to integers.
Element Mass/g Moles Ratio ×2 Integers
Ca 38.76 0.967 07 1.4998 2.9995 3
P 19.97 0.644 82 1 2 2
O 41.28 2.580 0 4.0011 8.0023 8
Thus, the empirical formula is Ca₃P₂O₈.
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There is a liquid mixture of water, H2O (1.0 g/mL), and pentane C5H12 (0.626 g/mL). What method would be best to separate these substances?
A.
decanting
B.
filtration
C.
chromatography
D.
distillation
The best method to separate a mixture of water and pentane is distillation, utilizing their different vapor pressures to achieve separation. Hence, option d) distillation is correct.
To separate a liquid mixture of water (H₂O) and pentane (C₅H₁₂), the best method would be distillation. The process of distillation involves choosing which parts of a liquid mixture to evaporate and condense. The difference in the vapour pressures, or volatilities, of the individual components is the basis of separation. This process leverages the significant difference in the vapor pressures of the two liquids. By heating the mixture, the component with the higher vapor pressure (in this case, pentane) will vaporize first. The vapor can then be condensed back into a liquid and collected, effectively separating it from water. The process of decanting involves separating mixtures of immiscible liquids or liquids and solids, like a suspension. Filtration is a physical technique that uses a filter media with a complicated structure that only allows fluid to flow through to separate solid matter and fluid from a mixture. Chromatography is a technique for separation in which a stationary phase is pushed through a liquid or gaseous mobile phase containing the analyte.
Tom is marking the locations of active volcanoes on a world map.Explain how the locations of a volcanoes are related to earth's plates
Which of the following is in the same period as chlorine (Cl)?
Question 12 options:
iodine (I)
tin (Sn)
phosphorous (P)
mercury (Hg)
Answer: phosphorous (P)
Explanation: Trust Me :)
Answer:
the answer is phosphorous
Explanation:
I just took test and got 100%
Explain why we must balance all chemical equations.
Answer is: The chemical equation must be balanced so that it follows the law of conservation of mass.
For example, ablanced chemical reaction:
Pb(NO₃)₂(aq) + Li₂SO₄(aq) → PbSO₄(s) + 2LiNO₃(aq).
According to law (principle) of mass conservation, number of atoms must be equal on both side of balanced chemical reaction.
There are two lithium atoms, one lead atom, one sulfur atom, ten oxygen atoms and two nitrogen atoms on both side of reaction.
A chemical equation should be balanced because of law of mass conservation.
Explanation:Laws in science are some rules applied on every form of matter.Law of mass conservation describes that matter can neither be created nor destroyed but it can be changed from one state to another.So in chemical equation either matter is changing its form one state (reactants) to other state(products).And balancing chemical equation is the equalization of number of atoms on both sides of equation.Which is we are indirectly following law of mass conservation.The mineral benitoite is a gemstone for making jewelry. It has a molecular weight of 413.44 grams/mole and a percent composition of 33.21% Ba, 11.58% Ti, 20.38% Si, and 34.83% O. What is the molecular formula?
A.
BaTiSi3O9
B.
Ba2TiSi2O3
C.
BaTiSi3O6
D.
BaTiSi6O9
Option-A (BaTiSi₃O₉)
Solution:Step 1: Calculate Moles of each Element;
Moles of Ba = %Ba ÷ At.Mass of Ba
Moles of Ba = 33.21 ÷ 137.33
Moles of Ba = 0.241 mol
Moles of Ti = %Ti ÷ At.Mass of Ti
Moles of Ti = 11.58 ÷ 47.88
Moles of Ti = 0.241 mol
Moles of Si = %Si ÷ At.Mass of Si
Moles of Si = 20.38 ÷ 28.09
Moles of Si = 0.725 mol
Moles of O = %O ÷ At.Mass of O
Moles of O = 34.83 ÷ 16.0
Moles of O = 2.176 mol
Step 2: Find out mole ratio and simplify it;
Ba Ti Si O
0.241 0.241 0.725 2.176
0.241/0.241 0.241/0.241 0.725/0.241 2.176/0.241
1 1 3 9
Hence, Empirical Formula = BaTiSi₃O₉
Step 3: Calculating Molecular Formula:
Molecular formula is calculated by using following formula,
Molecular Formula = n × Empirical Formula ---- (1)
Also, n is given as,
n = Molecular Weight / Empirical Formula Weight
Molecular Weight = 413.44 g.mol⁻¹
Empirical Formula Weight = 137.33 (Ba) + 47.88(Ti) + 28.09 (Si₃) + 16 (O₉) = 413.48 g.mol⁻¹
So,
n = 413.44 g.mol⁻¹ ÷ 413.48 g.mol⁻¹
n = 1
Putting Empirical Formula and value of "n" in equation 1,
Molecular Formula = 1 × BaTiSi₃O₉
Molecular Formula = BaTiSi₃O₉
Answer:
A.
BaTiSi3O9
Explanation:
the molecular formula for the mineral benitoite is BaTiSi3O9
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According to the video on nuclear power plants, what does PWR stand for?
PWR stands for many things. Since you're talking about nuclear power reactors I think PWR stands for pressurized water reactor.
A pressurized water reactor follows many steps but the main goal is to obtain thermal energy from water.
Hope it helped,
BioTeacher101
You are on an alien planet where the names for substances and the units of measures are very unfamiliar.
Nonetheless, you obtain 19 quibs of substance called skvarnick.
You can trade this skvarnick for gold coins, but the vendors all measure skvarnick in units of sleps; not quibs.
4 sleps is equal to 3 quibs.
if you have 19 quibs of skvarnick, how many sleps do you have?
Round your answer to the nearest tenth (one decimal place). Type only the number; not the number and unit.
Answer: 25.3
Explanation:
The question aks to convert 19 quibs, which is the amount of skvarnick that you obtained, to sleps.
Since, you are given the equivalence between sleps and quibs, you can build your own conversion factor, which is how the sciientific calculations are made:
Now, you can multiply 19 quibs by the conversion factor:
The quibs units cancel out since they are in the numerator and denominator, leaving only sleps.
If gas is moved from a large container to a small container but it’s temperature and number of miles remain the same, what would happen to the pressure of the gas?
Pressure will increase
Explanation:If gas is moved from a large container to a small container but its temperature and number of moles remain the same then its pressure will increase. Because whenever a gas is moved from a large container toward small container it pressures increases this is also true for liquids there pressure also increases when they move from a large surface area to small surface area.
Sam follows the directions on a box of pancake mix. The box says that it makes 10 pancakes, but he is able to make 8 pancakes from the ingredients. In this case, the number 10 represents which type of yield?
A) Actual yield
B) Theoretical yield
Given that the pancake mix can be used for the preparation of 10 pancakes. The other ingredients added to the pancake mix would be eggs, cheese, milk, salt and baking soda. If all of thee ingredients are added to the pan cake mix in required proportions, we can make 10 pan cakes. So, the theoretical yield will be 10 pancakes. But in real Sam was able to prepare only 8 pancakes. That means the number of pancakes produced was limited by the amount of other ingredients. So, the actual yield will be 8 pancakes.
Hence the correct answer B) Theoretical yield
Final answer:
The number 10 represents the theoretical yield, as it is the amount of pancakes anticipated by the recipe. Sam's 8 pancakes represent the actual yield, which is often less than the theoretical yield.
Explanation:
When Sam makes 8 pancakes from the mix, while the box indicates that it makes 10, the number 10 represents the theoretical yield. This is because the theoretical yield is the amount of product that could be made based on the recipe or, in chemical terms, the amount calculated using stoichiometric methods. In contrast, the actual yield is the amount of product actually produced, which in Sam's case is 8 pancakes. The actual yield is often less than the theoretical yield, due to factors such as incomplete reactions or measurement inaccuracies.
What is shared when molecules are formed?
A. Proton
B. Bond
C. Neutrons
D. Electrons
Among all the given options, the correct option is option D. Electrons are shared when molecules are formed.
What are molecules?It's not always clear what a molecule, compound, or atom means. Here are some examples of typical molecules along with an explanation about what a molecule are (and is not). When a group of atoms interact chemically, molecules are created. Whether the atoms are identical or dissimilar to one another is unimportant.
Elements' lone atoms are not molecules. O, the symbol for oxygen, is not really a molecule. When oxygen forms a link with another element or with itself, molecules are created. Electrons are shared when molecules are formed. Both simple and complicated molecules exist.
Therefore, the correct option is option D.
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How does the structure of a carbon atom enable it to form large molecules?
Carbon atoms have the unique ability to form stable covalent bonds with themselves and other elements, enabling them to create large and complex macromolecules. This versatility allows for the formation of carbon-based macromolecules such as proteins, nucleic acids, and carbohydrates. Carbon's bonding properties are crucial to the diversity and functionality of organic molecules in living organisms.
Explanation:The structure of a carbon atom is such that it can form stable covalent bonds with a variety of other atoms, including itself. This unique capability enables carbon to act as a building block for large molecules or macromolecules, essential to life. For instance, carbon's ability to bond with up to four different atoms allows for the formation of complex structures such as long chains, branching chains, and rings -- all of which are foundational structures in organic chemistry.
Macromolecules like proteins, nucleic acids, carbohydrates, and lipids all utilize carbon as their structural backbone. These macromolecules are essentially polymers, made of repeating units called monomers. These monomers, comparable to beads on a string, covalently bond together to form the larger polymers. The great variety of ways these carbon-based monomers combine results in the extraordinary diversity of organic compounds found in living organisms.
The ability to form multiple bonds with itself and other elements leads to a nearly limitless array of organic molecules. This property is foundational to the fields of organic chemistry and biochemistry, which study the complex molecules that determine the forms and functions of living systems.
Final answer:
The carbon atom's unique capacity to form stable covalent bonds with up to four different atoms, including itself, enables the construction of assorted large molecules essential for life, such as macromolecules and biochemistry's complex structures.
Explanation:
The structure of a carbon atom enables it to form large molecules due to its unique ability to establish stable covalent bonds with a wide variety of atoms, including other carbon atoms. A carbon atom can bond to as many as four different atoms simultaneously, creating a flexible backbone for macromolecules and allowing for the formation of complex structures. This versatility is evident in the fact that carbon is at the heart of an immense diversity of organic compounds, ranging from simple monomers to complex polymers and various functional groups. Carbon's capacity for forming long chains, branches, and rings plays a crucial role in the development of complex molecules needed for life, such as proteins, nucleic acids, carbohydrates, and lipids.
The ability of carbon to link with other elements like nitrogen, oxygen, and phosphorus further expands the repertoire of biological macromolecules. Subsequently, this accounts for the vast diversity of forms and functions in living organisms, earning carbon a central place in the study of biochemistry.
A ball with a density of 1100 kg/m3 is submerged in two liquids: water (ρ = 1000 kg/m3) and honey (ρ = 1400 kg/m3). What will the ball do?
We do not have enough information because we need to know the mass of the ball in order to determine whether it will sink or float.
The ball will sink in both the honey and the water because any solid object will sink in a liquid.
It will sink and accelerate downwards in water. It will float and accelerate upwards in honey.
Objects with a greater density than the surrounding liquid sink, while objects with a smaller density than the surrounding liquid float.
It will sink and accelerate downwards in honey. It will float and accelerate upwards in water.
Objects with a smaller density than the surrounding liquid sink, while objects with a greater density than the surrounding liquid float.
Hello!
So, we are given a ball with a density of 1100 kg/m³, and two liquids: water (1000 kg/m³) and honey (1400 kg/m³). Our goal is to determine if the ball will sink or float in the given liquids.
Let's take two common substances: water and ice. Water has a density of 1000 kg/m³ and ice has a density of about 917 kg/m³. You would notice that the ice is always floating when you put ice and water together. This would occur if you have other substances.
Here's what you should know:
If the density of an object is greater than the liquid it is in, then that object will sink. If the density of an object is less than the liquid it is in, then that object will float.Since the ball has a density of 1100 kg/m³, and water's density is 1000 kg/m³, then the ball will sink. If the ball is placed in honey, then it will float because the density of honey (1400 kg/m³) is greater than the ball's density.
Therefore, objects with a greater density than the surrounding liquid sink, while objects with a smaller density than the surrounding liquid float, which is the fourth choice.
Select the following group of elements that contains elements with similar chemical properties
A.
N, As, Bi
B.
Rb, Sn, In
C.
Li, Mg, Ga
D.
W, Tc, Fe
How many moles are present in 10.5 x 10^23 atoms of helium?
The atoms in a sample are close together but can slide past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between themwhich change of state is taking place?
When they are close together and can slide, it will be in the state of a liquid, which takes a particular volume, but not a form.
When energy is decreased, the atoms move slower, and eventually locked in place, which will give it a fixed form, i.e. a solid.
The change of state is therefore that from a liquid to a solid, i.e. freezing.
Explanation:
As we known that atoms in a liquid substance are closer to each other and they are able to slide past each other because the attractive forces between them are neither too strong or too weak.
Hence, liquid substance are able to take the shape of a vessel in which they are placed. Liquids have a fixed volume but no fixed shape.
On the other hand, atoms of a solid do not have enough kinetic energy. As they are held by strong attractive forces and they only vibrate at their mean position.
Hence, solids have fixed shape and volume.
Thus, we can conclude that in the given situation liquid to solid change of state is taking place.
Give three examples of objects that have kinetic energy.
Kinetic energy is the energy that an object possesses due to its motion. Examples of objects with kinetic energy include a moving car, a flying bird, and a rolling ball. The kinetic energy of these objects depends on their mass and speed.
Explanation:In the realm of physics, kinetic energy refers to the energy that an object possesses due to its motion. Here are three examples of objects that exhibit kinetic energy:
A moving car: When a car is in motion, it possesses kinetic energy. The quantity of this kinetic energy is directly related to the car's mass and the square of its speed.A flying bird: Similarly, a bird in flight has kinetic energy because it is moving. The kinetic energy in this case would depend on the bird's mass and the speed at which it's flying.A rolling ball: A ball that is rolling down a slope or across a floor has kinetic energy due to its movement. Like the other examples, the amount of kinetic energy the ball has would depend on its mass and its speed.Learn more about Kinetic Energy here:https://brainly.com/question/33783036
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1. What will happen if a car experiences a 300 N force to the right from the engine and a separate 150 N force due to friction and air resistance to the left? Show your work to support your position.
Given:
Force acting on the car moving it to the right = F1= 300 N
Force due to friction and air resistance moving it to the left = F2 = 150 N
To determine:
The net force on the car
Explanation:
Force is a vector. The force of friction acts in a direction opposite to the applied force.
If, F1 = 300N, right, then F2 = -150 N, left
Therefore, the net force acting on the car will be:
F = F1+F2 = 300 - 150 = 150 N
Ans: Since the force acting on the right is greater, the car will experience a net force of 150 N which will accelerate it to the right
Need help asap Thank you!!!!!!!!!!!!!!
What is the density of an object with a mass of 12.0 g and a volume of 80.0 cubic centimeters?
0.2 g/cm3
0.15 g/ cm3
0.150 g/ cm3
0.20 g/ cm3
Which substance is a primary source of hydrocarbons? A. cotton B. metals C. petroleum D. soil
Petroleum is a primary source of hydrocarbons. Therefore, the correct option is option C among all the given option.
Only hydrogen and carbon atoms make up the organic molecules known as hydrocarbons. They are the basic elements that make up fossil fuels including coal, oil, and natural gas. Hydrocarbons have a wide range of uses and are essential to many sectors of the economy, including manufacturing, energy, transportation, and agriculture. The energy component of hydrocarbons is one of its primary uses. Hydrocarbons are dependable sources of energy since they burn with a lot of heat released. Petroleum is a primary source of hydrocarbons.
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Which phrases accurately describe acids? Check all that apply.
taste sour
are gentle on skin and fabric
react with nonmetals
contain hydrogen
carry electrical charges
Answer: Option 1, 4 and 5 describe acids accurately.
Explanation:
Option 1: Acids have a sour taste because of the concentration of [tex]H^+[/tex] ion.
Option 2: They are corrosive in nature, that is they are not at all gentle with the skin and fabric as some acids intend to burn skin such as [tex]H_2SO_4[/tex] is a strong acid which can burn skin as well as fabric.
Option 3: Acids need electrons to release [tex]H^+[/tex] ions and non-metals do not donate electrons hence, there is no reaction between a non-metal and an acid.
Option 4: All acids do contain hydrogen. They dissociate in the presence of water to produce [tex]H^+[/tex] ions.
[tex]HCl\overset{H_2O}{\rightarrow} H^++Cl^-[/tex]
Option 5: Acids do conduct electricity that is they carry electrical charges. This was explained by Arrhenius. He said that the acids dissociate into [tex]H^+[/tex]ions, when it is dissolved in water. These ions hence acts as charge carriers in water.
Express as ordinary numbers. 6.02 x 109 =
Answer:
6,020,000,000Explanation:
The given number is 6.02 × 10⁹. It is written is scientific notation.
As you see it has two parts:
The first part are the digits with the decimal point after the first digit. This part is called mantissa. The mantissa can only have one digit, between 1 and 9, before the decimal point. The second part is a power of 10. The exponent can be either positive or negative.If the exponent is negative means that the decimal point must be moved to the left and if the exponent is positive means that the decimal point must be moved to the right.
In the number 6.02 × 10⁹ the exponent is 9, so you must move the decimal point 9 places to the right:
6.02 × 10⁹ = 6.02 × 1,000,000,000 - 6,020,000,000,Which of these four elements is the most reactive metal? a.NA b.Al c.Rb d.In
Answer: Option (a) is the correct answer.
Explanation:
Sodium has atomic number 11 ans its electronic configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{1}[/tex].
Sodium has one extra electron. Therefore , in order to gain stability sodium readily loses an electron to an electronegative atom. Hence, it becomes stable.
Thus, we can conclude that out of the given options, Na is the most reactive metal.
What is the oxidation number of phosphorus (P) in phosphoric acid (H3PO4)?
-7
+1
+5
+7
Hey there!:
H is always +1 so the H's have a +3 charge.
O is always -2 so the O's have a -8 charge .
Now, suppose oxidation state for P = X , then :
+3 + X + (-8) = 0 (because of neutral molecule)
x = 8 - 3
x = + 5
So, X = +5 oxidation state.
Answer C
Hope that helps!
how can the rate of a reaction be decreased
When you decrease the pressure, molecules don't hit each other as often and the rate of reaction decreases. Pressure is also related to concentration and volume. By decreasing the volume available to the molecules of gas, you are increasing the concentration of molecules in a specific space.
Lowering the amont of reactants
Hello can somone help me ?
Copper has an atomic number of 29.
That means that there are 29 protons in the nucleus of each copper atom. That's what the atomic number is; the number of protons in an atom of a certain element.
if one copper atom contains 29 protons, how many copper atoms could you make out of 174 protons?
[tex]174 \; \text{protons} / (29 \; \text{copper atoms} \cdot \text{proton}^{-1}) = 6 \; \text{copper atoms}[/tex]
Thus 174 protons would make at most 6 copper atoms. However, it would take 174 extra electrons (29 per atom) and even more neutrons than that to construct neutral copper atoms with stable nuclei.
Which of the following pairs is an example of the diagonal rule?
H, He
Fe, Rh
I, Po
Li, Mg
Which of the following pairs is an example of the diagonal rule?
Fe, Rh