The first answer would be:
Measure the sequence of events on earth over time.
I believe the second answer would be:
The age of earth. ( I say this because geological time is used to describe timing and the relationship of events in earths history)
I’m not sure about number 3 but I hope this was somewhat useful!!
What step must be performed before any stoichiometry problem is solved? Explain
Balancing the Equation, Converting Given Units of a Substance to Moles, mole ratio, convert to desired units
Balance the chemical equation, convert the unit into moles, calculate the moles of the product, and convert the moles of the product into desired units.
What are stoichiometry calculations?
Stoichiometry involves the relationship between reactants and products in a chemical reaction.
The first step in any stoichiometry problem is to balance the chemical reaction.
In stoichiometric calculations, both sides of the chemical equation must have the same number of atoms of each element. We use stoichiometric coefficients to balance the chemical reaction.
Convert the given mass of the reactant into moles.
The next step is to use the mole ratio concept to calculate the moles of the other substance from the moles of the given reactant.
Then use the moles of the reactant to calculate the moles of the yielded product in the chemical reaction.
In the end, convert the moles of the product into the desired units.
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a can of soda has a volume of 250 mL and a mass of 100 g? what is the density of the soda
Answer:
2500
Explanation:
Which of the following is an accurate example of how the water cycle can influence local weather? A. An increase in evaporation rates along a coastal area leads to afternoon thunderstorms. B. Water in a lake soaks into the local groundwater system. C. An increase in an area's precipitation causes the area to experience a drought. D. all of these
The answer is; A
During a hot day, the land heats up faster than the waters. The air on land becomes warm and less dense fast and begin to rise in the atmosphere. The air on the ocean with is still cooler and denser moves in to replace the rising on land air. This causes a sea breeze. The sea breeze carries with it, moisture. The hotter the day the higher the humidity. When the air goes inland, it causes precipitation when it rises, cool, and condenses.
Answer:
I got it Right
Explanation:
In Study Island
: How much energy is required to heat an iron nail with a mass of 25.5 grams from 65°C until it becomes red hot at 720°C?
(C for iron = 0.4494 J/g°C).
Part A: Enter the variable symbol for the quantity you need to find. Use your keyboard and the keypad to enter your answer. Then click Done.
Q = mct
-Q= energy in Joules
-m = mass in grams
-c= specific heat capacity in J/g degree C
-t = delta temperature in degrees Celsius
So,
Q = m c t
Q = (7 grams)(0.448J/g C)(750 C - 25 C)
Q = 2273.6 J
Your final answer = 2273.6 Joules
Energy is the amount required by the substance to proceed with the chemical reactions. The energy required by the iron nail will be 2273.6 joules.
What is energy?Energy is the product of the mass, specific heat capacity and change in the temperature. It is given as:
[tex]\rm Q = mC\Delta T[/tex]
Given,
Mass of the iron nail (m)= 25.5 gm
Specific heat capacity of iron (C) = 0.4494 J/g per degree C
Change in temperature = 725 degrees Celsius
Substituting values in the equation:
[tex]\begin{aligned} \rm Q &= \rm mC\Delta T\\\\&= 7\times 0.448\times 725\\\\&= 2273.6\;\rm J\end{aligned}[/tex]
Therefore, 2273.6 joules is energy.
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In which step of the scientific method is information obtained through the senses? a. drawing conclusions b. making observations c. analyzing data d. revising a hypothesis
Hello There,
The answer is:
B. making observations
Hope this help have a great day:)
The step of the scientific method in which information is obtained through the sentence is making observations (option B).
What is the scientific method and what steps does it involve?The scientific method is a standardized method used to understand natural phenomena by testing hypotheses. The first step in this method is to make observations, which means you gather information through senses such as sight, touch, and hearing, among others.
This step is followed by creating a hypothesis and then testing this hypothesis through a specific experiment. Based on this, the correct step is making observations (option B).
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When you heat a sample of a solid, the particles that make up the solid: * 0/1
get bigger
lose mass
move faster
slow down
Final answer:
The correct answer is "move faster". When a solid is heated, the particles that compose it move faster due to an increase in their average kinetic energy. The solid may expand overall, but the individual particles do not get bigger, lose mass, or slow down. The temperature rise is an indication of the increased vibrational motion of the particles within the solid.
Explanation:
When you heat a sample of a solid, the particles that make up the solid move faster. This happens because heating a substance increases the amount of thermal energy, which then increases the average kinetic energy (KE) of the particles. At a microscopic level, a solid consists of molecules and atoms vibrating quickly in place when hot, and moving slowly when cold, without any chemical reaction or phase change like melting or vaporizing. In a solid, these particles are in a constant state of vibration, and as they are heated, they gain energy and vibrate more quickly, which we interpret as an increase in temperature.
As the temperature rises, it's an excellent approximation that solids expand in each dimension by a specific fraction, assuming no constraints on their expansion. However, the particles themselves do not get bigger, lose mass, or slow down when heated. Instead, the increase in temperature may cause the solid to expand overall, while the proportions of the solid remain constant. This is because the interaction potential curve between particles is usually asymmetric, becoming less steep at greater distances and showing an increase in equilibrium particle-particle distance when the substance is heated.
If we consider endothermic processes like melting, the added heat increases the speed of the molecules causing them to move faster. In contrast, exothermic processes like freezing decrease the speed of the molecules causing them to move slower. Hence, the correct answer is that the particles move faster when a solid is heated.
A food item that is left out of the refrigerator turns brown and forms bubbles and gas. What are the signs that this is a chemical reaction? Check all that apply. * 2 points Heat is produced Bubbles appear. The color changes. Heat is absorbed. A precipitate forms.
The formation of bubbles and the change in color of the food item are signs of a chemical reaction, indicating the production of gas and the creation of new substances.
When a food item left out of the refrigerator turns brown, forms bubbles, and releases gas, the signs that a chemical reaction has occurred include the production of gas (evidenced by bubbles) and a change in color. These are key indicators that the original substances have undergone a chemical change to form new substances with different properties. While heat can be absorbed or produced during a chemical reaction, the question does not specify that this occurred, and there is no mention of a precipitate being formed.
A substance did not change its chemical nature in a reaction. Which most likely describes the reaction?
A) It was heated.
B) It was hit with a hammer.
C) It was placed in a salt solution.
D) It was frozen.
The correct answer is D
Answer:
It was frozen.
Explanation:
A substance may undergo any chemical change in its nature in all the given cases except when it is frozen.
A) during heating there is chances that it undergoes decomposition . Like if calcium carbonate is heated it converts to calcium oxide and carbon dioxide.
B) When a compound is hit with a hammer there is chance of its chemical decomposition.
C) If a compound is placed in a salt solution it may react with the salt or water.
D) However freezing is purely a physical process, where contact with any other compound or any chance of chemical decomposition is not possible.
The Law of Conservation of Matter describes how mass is not lost during a chemical reaction.
True
False
False, it states that matter can be nether created nor destroyed
Answer:
false
Explanation:
because it tells you the matter can't be created or destroyed.
How is a substance's structure and function affected by the attractive and repulsive forces of its molecules
a substance's physical properties are highly dependent upon the attractive and repulsive forces of its molecules.
A substance having strong inter molecular force of attraction will be solid, have high strength, fixed shape and volume. High melting point.
A substance having moderate intermolcualr force of attractions will be liquid, will be able to flow, have no fixed shape but have fixed volume.
A substance having weak intermolecular forces of attractions will be gas, will be able to flow, no fixed shape and no fixed volume.
Also the properties like viscosity, surface tension , vapour pressure, boiling point, melting point all the properties depends upon the intermoleuclar force of attractions.
how much iron can be recovered from 25 grams of Fe2O3
Answer: The mass of iron recovered is 17.5 grams
Explanation:
We are given a chemical compound having chemical formula of [tex]Fe_2O_3[/tex]
We know that:
Molar mass of iron (III) oxide = 159.7 g/mol
Mass of iron = 55.8 g/mol
We are given:
Mass of iron (III) oxide = 25 g
To calculate the mass of iron recovered in given amount of iron (III) oxide, we use unitary method:
From 159.7 grams of iron (III) oxide, mass of iron recovered is [tex](2\times 55.8)g[/tex]
So, from 25 grams of iron (III) oxide, mass of iron recovered will be [tex]\frac{(2\times 55.8)}{159.7}\times 25=17.5g[/tex]
Hence, the mass of iron recovered is 17.5 grams
The iron that will be recovered from 25 g of [tex]\bold{Fe_2O_3}[/tex] is
What is ferric oxide?Ferric oxide is an organic compound with the chemical formula [tex]\bold{Fe_2O_3}[/tex]. It is one of the three main oxides of iron.
Given,
Mass of [tex]\bold{Fe_2O_3}[/tex] is 25 gram
Molar mass of iron oxide is 159.7
Mass of iron is 55.8 g
To calculate the amount of iron
From 159.7 g of ferric oxide, the amount of iron we found is [tex]55.8\;g \times 2[/tex]
So, from 25 grams of ferric oxide, the mass of iron recovered will be
[tex]\dfrac{55.8 \times 2}{159.7} \times25 = 17.5 g[/tex]
Thus, the mass of iron recovered is 17.5 g.
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What best describes how water moves in one continuous column from a plant’s roots to its leaves?
A. polarity and cohesion
B. density and buoyancy
C. cohesion and adhesion
D. polarity and surface tension
The correct answer is option C, that is, cohesion and adhesion.
The molecules of water stay near to each other via cohesion, that is, the combined activity of hydrogen bonds amongst the molecules of water. The property of cohesion assists the plant to move water upwards from the root via the xylem towards the leaf.
At the same time, adhesion between the molecules of water to the cell walls of the plant assists to counteract gravity while water is conducted from the roots to the leaves. Thus, both the cohesion and the adhesion produces a capillary action, which keeps the molecules of water interacting with each other and conducting via the plants out to the cells of the leaf.
What will occur if the velocity of the gas molecules colliding with the sides of the container increases?
The pressure of the gas will increases
Answer:
The kinetic energy will increase and the pressure of the gas will also increase.
Explanation:
An increase in temperature will normally cause an increase in volume. Because the gas is enclosed in a rigid container the volume of the container can not increase.
An increase in temperature is by definition is an increase in kinetic energy. The increase in kinetic energy will cause the molecules of the gas to move more rapidly. As the molecules move more rapidly they collide with each other more violently. These collisions will cause an increase in pressure.
what is the tripple point on a phase diagram?
Final answer:
The triple point on a phase diagram represents the only combination of temperature and pressure at which all three phases can exist simultaneously and are in equilibrium.
Explanation:
The triple point on a phase diagram refers to the point where the solid/liquid, liquid/gas, and solid/gas lines intersect. It represents the only combination of temperature and pressure at which all three phases can exist simultaneously and are in equilibrium. An example is the triple point of water, which occurs at 273.16 K (0.01°C). At this point, water can exist simultaneously as solid ice, liquid water, and water vapor.
Based on the reactivities of the elements involved, which reactions will form products that are more stable than the reactants? 2LiF + Cl2 → 2LiCl + F2 2LiI + Cl2 → 2LiCl + I2 2LiCl + Br2 → 2LiBr + Cl2 2LiBr + F2 → 2LiF + Br2 2LiBr + I2 → 2LiI + Br2
2 LiI + Cl₂ → 2 LiCl + I₂
2 LiBr + F₂ → 2 LiF + Br₂
ExplanationEach of the five reactions involve one halogen molecule (F₂, Cl₂, Br₂, and I₂) substituting the ion of another halogen (F⁻, Cl⁻, Br⁻, and I⁻).
Halogen atoms are found in group 17 of the periodic table. They are all non-metal elements. Each of the halogen atom will gain one electron to form an ion of charge -1. However, the tendency to do so decreases down the group.
F is the first halogen in group 17. It has only two shells of electrons. Cl is right under F. Its electrons occupy three main energy shells. Br follows with four main energy shells. I is under Br and has five main energy shells.Atoms of all four elements have the same effective nuclear charge of +7. However, F has the smallest radius. As a result, it has the strongest hold on electrons around it. Its ion F⁻ is more stable than ions of Cl, Br, or I. Similarly, its molecule F₂ is more reactive than Cl₂, Br₂, and I₂.
As a result, the stability of halogen molecules increases down the group:
Stability: F₂ < Cl₂ < Br₂ < I₂.The stability of halogen ions decreases down the group:
Stability: F⁻ > Cl⁻ > Br⁻ > I⁻.Cl₂ repaces F⁻ (from LiF) in first reaction. F₂ and Cl⁻ are produced. F₂ is less stable than Cl₂. Cl⁻ is less stable than F⁻.
Cl₂ replaces I⁻ (from LiI) in the second reaction. I₂ and Cl⁻ are produced. I₂ is more stable than Cl₂. Cl⁻ is more stable than I⁻.
Br₂ replaces Cl⁻ (from LiCl) in the third reaction. Cl₂ and Br⁻ are produced. Cl₂ is less stable than Br₂. Br⁻ is less stable than Cl⁻.
F₂ replaces Br⁻ (from LiBr) in the fourth reaction. Br₂ and F⁻ are produced. Br₂ is more stable than F₂. F⁻ is more stable than Br⁻.
I₂ replaces Br⁻ (from LiBr) in the fifth reaction. Br₂ and I⁻ are produced. Br₂ is less stable than I₂. I⁻ is less stable than Br⁻.
Based on the reactivities of the elements involved, 2LiI + Cl₂ → 2LiCl + I₂ and 2LiBr + F₂ → 2LiF + Br₂ reactions will form products that are more stable than the reactants.
What do you understand reactivity?
Reactivity of any element is inversely proportional to the stability of the element. Because the stable element will not react quickly.
In the given question all the reactants are halogens except lithium and halogens are belongs from the 17th group of the periodic table.
In the molecular form stability of halogens are increasing from top to bottom, because size of halogens increases and repulsion between the atoms decreases.F₂ < Cl₂ < Br₂ < I₂
In the halide form stability of halogen group are decreasing from top to bottom because size increases then the effective nuclear charge of nucleus on the outermost shell electrons decreases and stability also decreases.F⁻ > Cl⁻ > Br⁻ > I⁻
Hence, the stable reactions are 2LiI + Cl₂ → 2LiCl + I₂ and 2LiBr + F₂ → 2LiF + Br₂.
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Question 6
Steel
Vacuum
Salt water
Oxygen gas
The answer would be G, a vacuum.
Explanation: Sound waves can't travel through a vacuum because a vacuum lacks air. Without air, no vibrations can occur and vibrations is a fundamental part for how sound is possible. Without it, sound waves can't travel.
A vacuum is the substance through which sound waves cannot travel, as sound requires a medium to propagate. Sound speed varies with the medium's density and rigidity, and sound travels fastest in solids, slower in liquids, and slowest in gases.
The substance that sound waves cannot travel through is a vacuum. Sound waves need a medium to travel through, such as solids, liquids, or gases because they are pressure waves.
In a vacuum, there are no particles to transmit the sound waves, thus no sound can be heard. This is why in space, where there is a vacuum, no one can hear you scream.
Sound waves travel at different speeds depending on the medium they move through.
The speed of sound is faster in materials that are more rigid and less compressible, such as solids, compared to liquids, and it is faster in liquids than in gases.
Factors like density and rigidity of the medium as well as temperature, affect the speed of sound.
Which of the following has can make 3 bonds ?
A-sodium (Na)
B-Neon (Ne)
C-Oxygen(O)
D-Nitrogen(N)
The answer is D-Nitrogen(N).
Nitrogen has three unpaired valence electrons, therefore, it can form three covalent bonds.
Which two particles can form an ionic bond with each other?
A.
a negative oxygen ion and a negative chlorine ion
B.
a positive sodium ion and a positive magnesium ion
C.
a positive calcium ion and a negative oxygen ion
D.
a neutral fluorine atom and a negative sulfur ion
The correct answer is C. A positive calcium ion and a negative oxygen ion
Explanation:
In chemistry, an ionic bond occurs as ions with opposite charges attract each other and then create a bond due to the transference of electrons from one atom to other. This means, this type of bond occurs between an atom that is positively charged and one that is negatively charged, therefore, the two particles that can form an ionic bond are "A positive calcium ion and a negative oxygen ion" because these two have opposite charges (one is positively charged and one is negatively charged) and therefore electrons can be transferred from one atom to another forming an ionic bond.
The beta rays emitted from atomic nuclei are _____.
an electron
a neutron
a proton
The answer I believe is An Electron
Answer: Electrons I hope this helped! Your fellow Brainly user, GalaxyGamingKitty.
A sample of copper powder is heated in an evaporating dish using a Bunsen burner. If the mass of the powder in the evaporating dish increases after heating, this indicates that A. the copper must have combined with another substance. B. the copper must have lost matter. C. hot copper is more dense than cold copper. D. hot copper weighs more than cold copper.
Answer : The correct option is, (A) the copper must have combined with another substance.
Explanation :
According to the question, when a sample of copper powder is heated in an evaporating dish by using Bunsen burner then the mass of the powder in the evaporating dish increases after heating that means the copper powder will be combined with the another substance.
If the mass of powder in the evaporating dish is decreases after the heating then the copper powder must have lost some matter.
The given option C and D are wrong statements because the hot copper is less dense than the cold copper and as we know that the density is directly proportional to the mass of a substance that means the hot copper weighs less than cold copper.
Hence, the correct option is, (A) the copper must have combined with another substance.
Answer:
a
Explanation:
If you designed your own experiment to prove the law of conservation of mass, what conditions would be required?
Four gases are described below:
Gas A: 5 liters at 20 °C
Gas B: 5 liters at 10 °C
Gas C: 5 liters at 40 °C
Gas D: 5 liters at 30 °C
Which gas has the greatest average molecular kinetic energy?
Answer:
Gas B: 5 liters at 10 °C
Explanation:
the warmer the container is the faster the molecules will move cause they aren't frozen and not able to move like Gas C: 5 liters at 40 °C.
A chemical that causes a sudden almost instantaneous release of pressure has and heat when subjected to sudden shock pressure or high temperatures best describes which type of DOT hazardous materials classification
A hazardous chemical instantly discharging gas, pressure, and heat when subjected to pressure, heat, or high temperature is categorized under hazard class I explosives by the Department of Transportation.
These are the explosives that possess the tendency to briskly detonate or conflagrate as an outcome of the chemical reaction. The explosives possess the tendency of generating pressures, temperatures, and speeds as leading to catastrophic destruction via force and/or of generating otherwise hazardous concentrations of light, heat, gas, sound, or smoke, all this resulting due to chemical reactions.
metals are malleable because the free flowing blank act as a lubricant and allow the blank to blank over each other
metals are malleable, which means they can be flatten to sheets.
Also metals are ductile , which means they can be made into thin wire.
The metals are malleable because the free flowing atoms act as a lubricant and allow the metal atom layer to roll over each other.
Answer:
Metals are NOT malleable because of lubricants.
The statement is FALSE.
Explanation:
Malleability is the ability of a material to bend while under pressure (compressive stress). A o malleable metal is one which can be hammered, rolled or flattened into thin sheets. Gold, iron, aluminium, copper, silver and lead are types of malleable metals.
Cheers!
Which of the following is the proper scientific notation for the number 18,200?
Answer:
18,200 is expressed in scientific notation as [tex]1.82 \times 10^4[/tex]
Explanation:
To write 18,200 using the scientific notation you have to divide it and multiply it by 10,000 (because 10,000 has 5 digits like 18,200) as follows:
[tex]\frac{18,200}{10,000} \times 10,000[/tex]
[tex]1.82 \times 10,000[/tex]
10,000 can be rewritten as [tex]10^4[/tex]. Therefore:
[tex]1.82 \times 10^4[/tex]
in a chemical reaction, ... interact to form ...
a. molecules, atoms
b. products, reactants
c. elements, atoms
d. reactants, products
The answer is letter D. Reactants, Products
What high pressure zone that forms between the trade winds and westerlies called?
The westerlies, anti-trades, or prevailing westerlies, are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees latitude. They originate from the high-pressure areas in the horse latitudes and trend towards the poles and steer extratropical cyclones in this general manner.
What kinds of rocks would you expect to see on Mars? What evidence do you have
like what are they made of? if so iron, due to iron oxide appearing as red hence why mars is red
What is the wavelength of an earthquake wave if it has a speed of 15 km/s and a frequency of 15 Hz?
use the equation below to determine how many liters of NH3 are needed to react completely with 10.0 L of N0 at STP
Answer is: 6.66 L of NH3 are needed to react completely.
Balanced chemical equation: 4NH₃ + 6NO → 5N₂ + 6H₂O.
V(NO) = 10.0 L; volume of nitrogen(II) oxide.
V(NH₃) = ?
Vm = 22.4 L/mol; molar volume at STP.
n(NO) = V(NO) ÷ Vm.
n(NO) = 10 L ÷ 22.4 L/mol.
n(NO) = 0.446 mol; amount of nitrogen(II) oxide.
From balanced chemical equation: n(NO) : n(NH₃) = 6 : 4
0.446 mol : n(NH₃) = 6 : 4.
n(NH₃) = 0.3 mol; amount of ammonia.
V(NH₃) = 0.3 mol · 22.4 L/mol.
V(NH₃) = 6.66 L.