Conservation of Mass in Chemical Reactions: 7th grade Science


Question: In a chemical reaction, the total mass of the reactants is 10.0 grams. After the reaction, the total mass of the products must be

A. More than 10.0 grams
B. Exactly 20.0 grams
C. Exactly 10.0 grams
D. Less than 10.0 grams

Answer:

naclo4+koh naoh+kclo4

Explanation:

if you know your cemestry

Answer:

it's A

Explanation:

a) The maximum observable range of redshifts that produces Lyman-alpha line is 0 ≤ z ≤ 10.6

b) i) identifying the galaxy with a radio source, ii) looking for other Lyman lines, iii) a coincidence with a continuum break

c)The maximum redshift range over which galaxies can be found using this strategy is z = 7 to z = 15.5.

d)Earth's atmosphere absorbs the radiation, and the laboratory conditions are not the same as interstellar conditions.

a) Lyman-alpha line is produced by the hydrogen atoms that have electrons that are in the ground state being raised to the first excited state. Over a certain range of redshifts, the Lyman-alpha line is redshifted to longer wavelengths that are observable by an optical spectrograph. The maximum observable range of redshifts that produces Lyman-alpha line is 0 ≤ z ≤ 10.6 (depending on the exact details of the galaxy's emission profile).

b) Observing the galaxy in the infrared can help in the identification of the Lyman-alpha line as it is shifted to longer wavelengths. Three ways to increase confidence in the correct identification of the Lyman-alpha line are:

i) identifying the galaxy with a radio source, ii) looking for other Lyman lines, iii) a coincidence with a continuum break.

c) The strategy that needs to be adopted is to look for the Lyman limit, which is the point at which the spectrum is cut off by the absorption of all hydrogen in the galaxy. To be certain that the line you detect is the Lyman-alpha line, you need to look for a decrement in the flux of the galaxy at wavelengths shorter than the line and a decrement in the flux at wavelengths longer than the line. This is because the Lyman limit will be shifted to longer wavelengths at higher redshifts, so to maximize the redshift range over which galaxies can be found, you need to search for the Lyman limit at the longest wavelength possible. The maximum redshift range over which galaxies can be found using this strategy is z = 7 to z = 15.5.

d) The reason why such lines can be seen from interstellar gas but not the Earth's atmosphere or in the laboratory is that the Earth's atmosphere absorbs the radiation, and the laboratory conditions are not the same as interstellar conditions. The forbidden lines from the interstellar gas are not affected by dust absorption because they are produced in regions where dust is not present.

for such more questions on  atmosphere

https://brainly.com/question/19587559

Answer:

C. and D. i think

Explanation:

Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Aluminium, or 26.981538 grams.

As a general partnership, Acme Chemical Consultants is considered a legal entity separate from its individual partners. general partnership does not provide limited liability protection to its partners.

The partners of Acme Chemical Consultants can be held personally liable for the actions and obligations of the partnership. When the partnership discharges a pollutant prohibited by the EPA, the firm, as a legal entity, will be held responsible for the violation. The EPA has the authority to impose fines and penalties on Acme Chemical Consultants for its actions. The fines levied by the EPA would typically be imposed on the partnership itself, rather than the individual partners.

It is important to note that while the firm is primarily liable for the resulting fine, in certain circumstances, the partners of Acme Chemical Consultants may still be held personally liable if the firm does not have adequate assets to cover the fines. Personal liability of the partners would generally come into play if the partnership is unable to satisfy the imposed fines and the partners are deemed responsible for paying the remaining amount from their personal assets.

Learn more about Acme Chemical here

https://brainly.com/question/16703672

#SPJ11

halogens have 7

allali have 2

noble gases have 8

K = 1

P = -3

Ra= 7

Cl = -1

N = 5

O = 6

Answer:

Approximately 8.8 grams of solid KNO3 will precipitate from the solution when it's cooled from 50 degrees Celsius to 20 degrees Celsius.

Explanation:

The solubility of a solid in a liquid typically decreases as the temperature decreases. As a result, when a saturated solution is cooled, some of the solid may precipitate out of the solution.

The solubility of potassium nitrate (KNO3) in water at 20 degrees Celsius is around 42 grams per 100 milliliters of water. At 50 degrees Celsius the solubility is around 86 grams per 100 milliliters of water.

To find the mass of solid that will precipitate, we can use the difference between the solubility of KNO3 at 20 degrees Celsius and at 50 degrees Celsius.

At 20 degrees Celsius, the solubility of KNO3 is 42 g/100 mL, and at 50 degrees Celsius, the solubility is 86 g/100 mL.

So, the difference between the solubility of KNO3 at 20 degrees Celsius and at 50 degrees Celsius is 86 - 42 = 44 grams per 100 milliliters.

Since we have 20 mL of a saturated solution, we can calculate the mass of the precipitate by multiplying the difference in solubility by the volume of the solution:

44 g/100 mL * 20 mL = 8.8 grams.

So, approximately 8.8 grams of solid KNO3 will precipitate from the solution when it's cooled from 50 degrees Celsius to 20 degrees Celsius.

Please note that this is an approximate calculation and the actual amount of precipitate may vary depending on other factors such as impurities and the specific conditions of the experiment.

The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.

Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.

The balanced chemical equation for this synthesis reaction is:

Mg + Cl₂ ⇒ MgCl₂

Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.

Learn more about synthesis reactions:

brainly.com/question/16281119

Answer:

273.15

Explanation:

Answer:

8.3 g of NaCl

Explanation:

Edge 2022

Answer:

8.3 g NaCl

Explanation:

Its right just type it in

Explanation:

Homogeneous Mixture:-

Heterogeneous Mixture:-

Answer: A. The wall push back on the ball with more force, which causes the return speed of the to increase.

Explanation: For every for exerted on an object, there is an equal force exerted in the opposite direction. When the ball hits the wall with more force, the wall pushes back on the ball with more force. This causes the return speed of the ball to increase. The force that the wall applies to the ball launches the ball in the opposite direction. The greater the force on the ball, the greater it’s speed becomes .

Answer: The wall pushes back on the ball with more force, which causes the return speed of the ball to increase.

Explanation: Correct on Study Island

British thermal units (Btu) are a unit used to measure the amount of heat in fuels or other energy sources.

The amount of heat needed to raise a pound of liquid water's temperature by one degree Fahrenheit at the point where water has its highest density (approximately 39 degrees Fahrenheit).

Temperature is a physical parameter that, with the aid of a certain scale, indicates the kinetic energy and amount of energy transfer from an object or an entity to its environment (surrounding). Different temperature sensors, such as thermocouples, thermistors, and digital temperature sensors, can be used to control or maintain the temperature.

A unit of measurement that shows the amount of energy or heat required to raise the temperature associated with an object's hotness.

Learn more about British thermal units:

brainly.com/question/1224318

#SPJ4

\(p = \frac{m}{v} \\ p = \frac{150}{300} \\ p = 0.5kgm^{ - 3} \)

The density of the object is 0.5kgm-3

Density =mass/volume

=6/3

=2

Answer:

H-O* + CH3-CH3 ----> H-O-CH2-CH2*

H-O* + CH\(_3\)-CH\(_3\) → H-O-CH\(_2\)-CH\(_2\)* is an example of an initiation phase for an addition polymerization reaction. Therefore, the correct option is option A.

High-molecular-weight compounds known as polymers are created by the aggregation of several smaller molecules known as monomers. Polymers make up the natural and manmade fibres used in clothes as well as the polymers that have revolutionised society.

Two fundamental methods for creating polymers exist: (a) joining small molecules together by an addition reaction, and (b) joining molecules while getting rid of a stable small molecule like water. Condensation processes, which combine addition and elimination reactions, are what this later type of polymerization is known as. H-O* + CH\(_3\)-CH\(_3\) → H-O-CH\(_2\)-CH\(_2\)* is an example of an initiation phase for an addition polymerization reaction.

Therefore, the correct option is option A.

To know more about polymerization reaction, here:

https://brainly.com/question/3775111

#SPJ7

Answer: An endothermic reaction feels cold to the touch because the reaction (acting here as the system) absorbs heat from the surroundings.  The heat absorbed by the reaction (from your body, in this case) does not increase its temperature, but rather becomes potential energy stored in chemical bonds.

Endothermic reaction system absorbs heat from the surroundings. Thus when we touch the reaction vessel we lose heat into the system. Heat absorbed by the reaction will not increasing its temperature but increases the reaction rate.

Endothermic reactions are those reactions in which the reactants absorbs heat energy from the surroundings and forms the product. The enthalpy change or reaction enthalpy for endothermic reactions is positive whereas, it is negative for an exothermic reaction where, heat is evolved to surrounding.

The reaction system absorbs heat from the surroundings so that, the surrounding temperature is decreased results in cool when we reaction vessel. The temperature from our hand too absorbed onto the system and make our fingers cool.

Hence the sentences can be completed as:

n endothermic reaction feels cold to the touch because the reaction   absorbs heat from the surroundings. When you touch the vessel in which the reaction occurs, you, being part of the surroundings, loss heat to the system  which makes you feel cold.

The heat absorbed by the reaction does not  increases its temperature, but rather becomes potential energy stored in chemical bonds.

To find more on endothermic reactions, refer here:

https://brainly.com/question/23184814

#SPJ5

Answer:

A. Exactly 1.55 ounces

Answer:you only need one to balance Fe(NO3)2 react with Pb

Explanation:

Answer:

d

Explanation:

The right answer is: NaOH will react with benzoic acid to form a salt which is soluble in water. Sodium hydroxide (NaOH) interacts with benzoic acid to produce sodium benzoate.

Which is soluble in water, when it is added to a solution of benzoic acid in dichloromethane. In this reaction, benzoic acid is neutralised by the potent base NaOH to produce sodium benzoate, a salt that is more polar and water soluble than benzoic acid. Due to its lower polarity, the dichloromethane layer cannot dissolve the sodium benzoate salt. Hence, using water to extract the salt from the combination makes it simple to do so. A white crystalline organic molecule with the chemical formula C6H5COOH is benzoic acid. It is a typical food preservative that occurs naturally in many different plants and fruits, including cinnamon, prunes, and cranberries.

Food, pharmaceuticals, and cosmetics are just a few of the areas where benzoic acid is used. It is frequently utilised in soft drinks, fruit juices, pickles, and salad dressings as a food preservative since it is excellent against bacteria, yeast, and moulds.

Learn more about NaOH here:

https://brainly.com/question/29854404

#SPJ4

V₂O₅ (s) + 2H₂ (g) → V₂O₃ (s) + 2H₂O(l) is the balanced chemical equation for the reaction of solid vanadium(V) oxide with hydrogen gas to form solid vanadium(III) oxide and liquid water.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

The word based equation is

Vanadium(V) oxide + Hydrogen gas → Vanadium (III) oxide + Water

Now write the chemical equation

V₂O₅ (s) + 2H₂ (g) → V₂O₃ (s) + 2H₂O(l)

Reactant side                Product side

V = 2                                V = 2

O = 5                                O = 5

H = 4                                 H = 4

We can see that the number of atoms on reactant side is equal to the number of atoms on product side. So the given equation is balanced.

Thus from the above conclusion we can say that V₂O₅ (s) + 2H₂ (g) → V₂O₃ (s) + 2H₂O(l) is the balanced chemical equation for the reaction of solid vanadium(V) oxide with hydrogen gas to form solid vanadium(III) oxide and liquid water.

Learn more about the Balanced chemical equation here: https://brainly.com/question/15355912

#SPJ4

Answer:

Explanation:

Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust.

Sunlight, oxygen, and water are considered abiotic factors. Consumers and producers are considered biotic factors.

The ecosystem is made up of two main factors biotic and abiotic factors. The biotic factors are those factors that are considered the living components of the ecosystem. The abiotic factors are those factors that are considered the non-living components of the ecosystem.

Sunlight is abiotic because it is non-living but helps in photosynthesis. The consumer is biotic because it is a living organism that depends on food for another organism. Oxygen is abiotic because it is non-living but useful for the survival of the living organism. Water is abiotic which is non-living but essential for cells. Producers are biotic because they are living organisms that produce their own food.

Biotic: consumer, producer

Abiotic: sunlight, oxygen, water

Both: none

To know more about the ecosystem:

https://brainly.com/question/23945642

#SPJ4

Answer:

It depends through where the glucose goes through

Explanation:

Answer:

Filtration, Sifting and Decanting

Explanation:

Heterogenous mixtures can be seperated by filtration and sifting (Also known as sieving). Sifting is the process of parting a mixture using a sieve. Sifting is used to separate solid mixtures that contain molecules of varying sizes. Filtration is the process of separating a liquid from an insoluble solid. A common example is using a funnel and a coffee filiter to seperate the liquide from the insoluable solid. Although there are many other methods for filtration. You can also separate mixtures by decantation. Decantation is the process of separating a liquid from a solid/liquid by removing the liquid layer at the top from the layer of solid/liquid below.