Answer:
103.8 g
Explanation:
When the hot piece of copper is placed in the water at lower temperature, the piece of copper gives off thermal energy to the water; as a result, the temperature of the copper decreases while the temperature of the water increases, until they both reach the equilibrium temperature.
The heat given off by the piece of copper is equal to the heat absorbed by the water, so we can write:
[tex]Q_c=Q_w[/tex]
where:
[tex]Q_w=m_w C_w \Delta T_w[/tex] is the heat absorbed by the water, where
[tex]m_w = 96.2 g[/tex] is the mass of water
[tex]C_w=4.186 J/gC[/tex] is the specific heat of water
[tex]\Delta T_w=5.1C[/tex] is the rise in temperature of the water
Solving,
[tex]Q_w=(96.2)(4.186)(5.1)=2053.7 J[/tex]
[tex]Q_c=m_c C_c (T_c-T)[/tex] is the heat released by the copper, where
[tex]m_c[/tex] is the mass of copper
[tex]C_c=0.385 J/gC[/tex] is the specific heat of copper
[tex]T_c=73.6C[/tex] is the initial temperature of copper
[tex]T=17.1C+5.1C=22.2 C[/tex] is the equilibrium temperature
Solving for the mass,
[tex]m_c=\frac{Q_c}{C_c(T_c-T)}=\frac{2053.7}{(0.385)(73.6-22.2)}=103.8 g[/tex]
The correct answer is the mass of the copper piece is approximately 16.3 grams.
To solve this problem, we can use the principle of conservation of energy, which states that the heat lost by the copper will be equal to the heat gained by the water.
The heat transfer can be calculated using the formula:
[tex]\[ q = mc\Delta T \][/tex]
For the copper piece, the heat lost is given by:
[tex]\[ q_{copper} = m_{copper}c_{copper}(T_{final} - T_{initial,copper}) \][/tex]
For the water, the heat gained is given by:
[tex]\[ q_{water} = m_{water}c_{water}(T_{final} - T_{initial,water}) \][/tex]
Since the heat lost by the copper is equal to the heat gained by the water, we can set the two equations equal to each other:
[tex]\[ m_{copper}c_{copper}(T_{final} - T_{initial,copper}) = m_{water}c_{water}(T_{final} - T_{initial,water}) \][/tex]
Given that [tex]\( T_{final} \)[/tex] is the temperature of the water after the copper is added plus the temperature rise:
[tex](17.1C + 5.1C = 22.2C), \( T_{initial,copper} \) is 73.6C, and \( T_{initial,water} \) is 17.1C,[/tex]we can plug in the values:
[tex]\[ m_{copper}(0.385)(22.2 - 73.6) = (96.2)(4.184)(22.2 - 17.1) \][/tex]
Now, we solve for [tex]\( m_{copper} \)[/tex]:
[tex]\[ m_{copper} = \frac{(96.2)(4.184)(22.2 - 17.1)}{(0.385)(22.2 - 73.6)} \] \[ m_{copper} = \frac{(96.2)(4.184)(5.1)}{(0.385)(-51.4)} \] \[ m_{copper} = \frac{(96.2)(4.184)(5.1)}{(0.385)(-51.4)} \] \[ m_{copper} \approx \frac{(96.2)(4.184)(5.1)}{(-20.163)} \] \[ m_{copper} \approx -16.3 \text{ grams} \][/tex]
Since mass cannot be negative, the negative sign indicates a direction in heat transfer (the copper loses heat), but the magnitude of the mass is what we're interested in.
Therefore, the mass of the copper piece is approximately 16.3 grams.
1. Why is carbon dioxide a gas at low temperatures at mars
2. How does sodium chloride combine (share) electrons
3. Name the force of attraction between metal and non-metal
4. Explain ionic compound
1. carbon dioxide is a gas at low temperatures at mars because in the oxidizing environment organic compounds are oxidized to form carbon dioxide.
2. The 1 electron in outermost shell of Na is shared with 7 electrons of outermost shell of chlorine giving neutral charge on compound.
3. Electrostatic force of attraction is between the metal and non-metal.
4. When metal and non metal exchange electrons to form a neutral or no charge compound it is said to have form ionic bonds.
Explanation:
1. Temperature at Mars is very low -80 Fahrenheit (-60 degrees) because water is not present in the planet. Carbon dioxide is abundant in Mars. The atmosphere is oxidizing at Mars which oxidizes the organic compounds and forms carbon dioxide.
2. NaCl combines by sharing of electrons forming ionic bonding. Different atoms of the different element share electrons to form ionic bonds. Such bond is formed when electrons is transferred between the atoms. In the NaCl, Na has 1 electron (electropositive) in its outer shell and chlorine has 7 electrons (electronegative). Both share the electrons getting their octet complete and a neutral charge on the compound formed.
3. Electrostatic force of attraction is between the metal and non-metal when bond is formed. The ionic bonds is formed between metal and non metals when electron exchange takes place. The electrostatic force is the attraction between two opposite charges on the ion.
4. When a metal and non metal exchange electrons in which metal is electropositive and non metal is electronegative the bonds form is called ionic bond. The electron is transferred from metal to non metal and thus giving neutral charge on the compound i.e. the outer shell has its octet complete.
4. The average kinetic energy of water molecules is greatest in
O liquid water at 273 K
O ice at 0°C
O liquid water at 90°C
O steam at 100°C
Answer:
steam at 100°C
Explanation:
Grandpoint approved
The average kinetic energy of water molecules is greatest in steam at 100°C.
Kinetic energy of waterWater is a polar solvent that has potential energy on its own which can be converted to kinetic energy once the water is in motion.
The kinetic energy is that energy that a moving body possesses.The faster a molecule moves, the more kinetic energy it has, and the higher the measured temperature.
That being said, when the temperature of water is increased, there would be increased molecular motion leading to a higher kinetic energy.
Therefore, the average kinetic energy of water molecules is greatest in steam at 100°C.
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2. When a teaspoonful of sugar is added to water in a beaker,
the sugar dissolves. The resulting mixture is
1) a compound
2) a solution
3) a suspension
4) an emulsion
The mixture is a solution
Its a solution because two substances mixed
Hydrogen gas reacts with oxygen to form liquid water. Write a balanced chemical equation for this reaction
Answer:
2H2 + O2 —> 2H2O
Explanation:
The equation for the reaction between H2 and O2 to produce liquid water is illustrated below:
H2 + O2 —> H2O
Next, we need to balance the equation. This can be achieved by doing the following:
There are 2 atoms of oxygen on the left side and 1 atom on the right side. It can be balanced by putting 2 in front of H2O as shown below:
H2 + O2 —> 2H2O
There are a total of 4 atoms of Hydrogen on the right side and 2 atoms on the left. It can be balanced by putting 2 in front of H2 as shown below:
2H2 + O2 —> 2H2O
Now we can see that the equation is balanced as we have the same number of atoms of Hydrogen and oxygen on both sides of the equation
The balanced chemical equation for the reaction of hydrogen gas with oxygen to form liquid water is: 2H2 + O2 = 2H2O. This equation respects the law of conservation of mass.
Explanation:The reaction of hydrogen gas with oxygen to form liquid water is a chemical reaction that can be written as a balanced chemical equation. In this reaction, two molecules of hydrogen gas (H2) react with one molecule of oxygen gas (O2) to form two molecules of liquid water (H2O). So, the balanced chemical equation for this reaction is:
2H2 + O2 = 2H2O
This equation shows that for every two molecules of hydrogen gas and one molecule of oxygen gas, two molecules of water are produced. It is balanced because it obeys the law of conservation of mass, which states that the total mass of the reactants equals the total mass of the products in a chemical reaction.
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What are the characteristics of an atom or molecule when in the gas phase
Answer:vapor
Explanation: Because it is
Answer:
nonrigid shape or volume; highly active and mobile
Explanation:
Are C-12, C-13, and C-14 all carbon isotopes?
Answer:
Yes, they are isotopes.
Explanation:
Isotopes are atoms with the same atomic number Z and a different mass number (A). That is, they differ in the number of neutrons (eg carbon 12, has 6 protons, 6 electrons, and 6 neutrons, carbon 13, 7 neutrons, and carbon 14 8 neutrons).
How many moles do you need in HCL
Balance the following chemical equation if necessary:
V2O5 (s) + HCl (aq) ---> VOCl3 (s) + H2O (l)
The balanced version of the chemical equation V2O5 (s) + HCl (aq) --> VOCl3 (s) + H2O (l) is: V2O5 (s) + 6 HCl (aq) --> 2 VOCl3 (s) + 3 H2O (l). This balance is achieved by ensuring an equal number of each type of atom on both sides of the equation.
Explanation:To balance the given chemical equation, we need to ensure there are equal numbers of each type of atom on both sides of the equation. Let's start with vanadium (V) and chlorine (Cl) atoms, as they are only in one reactant and one product:
V2O5 (s) + 2 HCl (aq) ---> 2 VOCl3 (s) + H2O (l)Now we have two vanadium atoms on both sides, but the number of chlorine atoms is not balanced yet. We'll increase the number of hydrochloric acid (HCl) molecules:
V2O5 (s) + 6 HCl (aq) ---> 2 VOCl3 (s) + H2O (l)Last, let's balance the number of hydrogen (H) and oxygen (O) atoms. We'll also add some water molecules:
V2O5 (s) + 6 HCl (aq) ---> 2 VOCl3 (s) + 3 H2O (l)So the balanced equation is: V2O5 (s) + 6 HCl (aq) --> 2 VOCl3 (s) + 3 H2O (l).
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The question is about balancing a chemical equation. The balanced equation for V2O5 (s) + HCl (aq) ---> VOCl3 (s) + H2O (l) is V2O5 (s) + 6HCl (aq) ---> 2VOCl3 (s) + 3H2O (l)
Explanation:The subject of this question relates to the balancing of a chemical equation. The chemical equation provided: V2O5 (s) + HCl (aq) ---> VOCl3 (s) + H2O (l) needs to be balanced, that is, the number of atoms of each element on the reactant (left) side of the equation have to equal the number of atoms of each element on the product (right) side of the equation. In this case, the balanced chemical equation would be V2O5 (s) + 6HCl (aq) ---> 2VOCl3 (s) + 3H2O (l)
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What information does a net ionic equation give?
O
A. It lists only the spectator ions that are present.
B. It lists only the components that are ions.
O
C. It lists only the substances that are changed.
D. It lists only the aqueous components of the reaction.
Answer:
C. It lists only the substances that are changed.
Explanation:
Balanced Chemical equation:
HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)
Ionic equation:
H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)
Net ionic equation:
H⁺(aq) + OH⁻(aq) → H₂O(l)
The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form. This'e why it is written in net ionic equation.
Spectator ions:
These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.
Final answer:
A net ionic equation lists only the substances that change during a reaction, excluding spectator ions that do not participate in the chemical process. Therefore, the correct answer is C: It lists only the substances that are changed.
Explanation:
A net ionic equation is a chemical equation that shows only the species that actually participate in the reaction. These species are the ions that undergo a chemical or physical change during the reaction, which is different from the spectator ions that do not participate in the reaction. Spectator ions are present in the solution before and after the chemical reaction and do not undergo any change, so they are not included in the net ionic equation.
Correctly answering the student's question, a net ionic equation provides information about option C: It lists only the substances that are changed. This type of equation demonstrates the actual chemical change between the ionic compounds, excluding all the spectator ions that remain unchanged during the reaction process.
Solve the problems. Express your answers to the correct number of significant figures. 2.31/0.790
Answer:
[tex]\dfrac{2.31}{0.790}=2.92[/tex]
Explanation:
When you divide two measures, the rule for the number of significant figures of the quotient is to keep the number of significant figures of the measure with least significant figures.
2.31 has three significant figures0.790 has three significant figuresThen, the asnwer must have three significant figures:
[tex]\dfrac{2.31}{0.790}\approx 2.92405\approx2.92[/tex]
Since the figure after 2.92 is less than five, you just drop it.
Final answer:
To solve 2.31 ÷ 0.790, divide the numbers and round the result to three significant figures, the least number present in the given values, giving the final answer as 2.92.
Explanation:
To solve the division problem 2.31 ÷ 0.790 with the proper number of significant figures, we must consider the number of significant figures in each of the original numbers. The number 2.31 has three significant figures, and 0.790 has three significant figures as well. When dividing, the number of significant figures in the result should be the same as the number with the least significant figures in the problem.
To get the answer, we divide 2.31 by 0.790:
Perform the division using a calculator: 2.31 ÷ 0.790 = 2.92405063…Round the result to three significant figures because that is the least number of significant figures in the original numbers: 2.92Therefore, the answer to the problem expressed to the correct number of significant figures and with proper units (if they were provided in the original problem), would be 2.92.
Why do reactivity increases on moving from top to bottom in group 2 of modern periodic table?
Answer:
that's because....
group 1 (e.g Na, K) those tend to lose one electron to gain noble gas electron configuration.
they can achieve that by just losing one electron from their outer shell.
as you go down the group 1, element gets bigger in size, which means there is more space between nucleus (which is in center of atom) and electron of outer shell. the more far away they are the less attraction force between them.
so its easier for potassuim to lose one electron than for lithuim.
so that means potassium will easily give up 1 electron to react with non metal or other element therefore it is more reactive than lithuim
but in case of non metal, the opposite happens but simple to understand.
as you go down the group 7 (halogen- Cl, Br, I) element will get bigger therefore force between nucleus and outer electron is getting smaller. they have to gain 1 electron in order to fill the outer shell (to gain noble gas electron configuration.)
as florine is more smaller in size than clorine it is more reactive because florine has more tendency to pull extra electron from metal or other element towards its side. so it easily gain 1 electron to react.
How many molecules of the sweetener saccharin can be prepared from 30 C atoms, 25 H atoms, 12 O atoms, 8 S atoms, and 14 N atoms?
To determine the number of saccharin molecules in a given sample, you can use the molar mass and Avogadro's number. The molar mass of saccharin is 183.18 g/mol and Avogadro's number is approximately 6.022 x 10^23 molecules/mol. By plugging in these values and doing the appropriate calculations, you can find the desired quantities.
Explanation:To determine the number of molecules of saccharin that can be prepared, we need to first calculate the molar mass of saccharin. The formula for saccharin is C7H5NO3S, which gives a molar mass of (7*12.01) + (5*1.008) + (1*14.01) + (3*16.00) + 32.06 = 183.18 g/mol.
With this information, we can calculate the number of saccharin molecules in a 0.0400 g sample by using Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol. So, (0.0400 g / 183.18 g/mol) * (6.022 x 10^23 molecules/mol) = X molecules of saccharin.
To find the number of carbon atoms in the same sample, we can again use the molar mass and Avogadro's number. (0.0400 g / 183.18 g/mol) * (6.022 x 10^23 molecules/mol) * 7 carbon atoms/molecule = Y carbon atoms.
The sea water has 8.0x10^-1 cg of element strontium. Assuming that all strontium could be recovered, how many grams of strontium could be obtained from 9.84x10^8 cubic meter of seawater. Assuming the density of sea water is 1.0g/mL.
Answer:
[tex]\large\boxed{\large\boxed{7.9\times 10^9g}}[/tex]
Explanation:
The information of the content of the element strontium in seawater is incomplete. The complete information is:
The seawater has 8.0×10⁻¹cg of element strontium per kilogram of seawater. Solution1. First, convert the given volume of seawater given to kilograms
[tex]9.84\times 10^{8} m^3\times \dfrac{1,000dm^3}{m^3}\times \dfrac{1,000cm^3}{dm^3}\times 1.0\dfrac{g}{cm^3}\times\dfrac{1kg}{1,000g}=9.84\times 10^{11}kg[/tex]
2. Second, multiply the given concentration of the element strontium by the amount of seawater in kilograms
[tex]8.0\times 10^-1cg/kg\times 9.84\times 10^{11}kg\times 1g/100cg=7.872\times 10^9g[/tex]
3. Finally, round to two significant figures:
[tex]7.9\times 10^9g[/tex]
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2 Al + 3 FeO → Al2O3 + 3 Fe
If 379.48 grams of Al2O3 are produced, how many grams of Fe will also be produced?
Answer:
Fe=625.026g
Molar mass of Al2O3=102g
Molar mass of Fe=168g
102g of Al2O3-168g of Fe
379.48g of Al2O3-xg of Fe
Cross multiply
102x = 168×379.49
102x=63752.64
X= 625.026g
Therefore,the mass of Fe is 625.027g
Explanation:
When turbidity currents deposit graded beds of mud and sand on the ocean floor, what type of rock is formed?
A. Sedimentary
B. Metamorphic
C. Igneous basalt
D. Igneous granite
• What policies might people put in place to conserve water levels in lakes and aquifers?
Some policies they might do is to put limits on water usage, like making sure that people don't use too much water in baths and when they are tending to their gardens.
Reduce the use of water can conserve water levels.
Following are the policies that might people put in place to conserve water levels in lakes and aquifers:Dispose of chemicals properly in order to protect the water from contamination.Take used motor oil to a recycling center.Use modern methods of irrigation for irrigating the crops.Take short showers during bathing.Shut water off while brushing teeth.In conclusion, reduce the use of water can conserve water levels.
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List one way you can conserve water
Answer:
Shorter showers
Explanation:
A 5 to 10 minute shower will only take about 10 or 20 gallons of water. Or you could take a bath and not fill the bathtub up very much.
It's completely up to you which one you chose to use. Many people take 30 to 60 minute showers. Based on that math, that could take up to 120 gallons of water.
That shows that simply shortening your shower time, you will save gallons of water!
~CaityConcerto
Which type of spectrum does the illustration A
show?
continuous
bright line
dark line
Answer:
(A)-Continuous
Continuous type of spectrum does show the illustration A. Therefore, option A is correct.
What does a continuous spectrum show?A continuous spectrum contains all light wavelengths within a specific range. Hot, dense light sources, such as stars, emit a nearly continuous spectrum of light that travels in all directions and interacts with other materials in space.
Continuous spectra also known as thermal or blackbody spectra are produced by dense gases or solid objects that emit heat. They emit radiation at a wide range of wavelengths, giving the spectra a smooth and continuous appearance.
The visible "electromagnetic spectrum" is a continuous spread of all spectral colors organized by wavelength.
Thus, option A is correct.
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Of the total base sequence in human DNA, what percentage codes for proteins? A) Nearly 50 percent
B) About 5 percent
C) About 90 percent
D) 100 percent
Answer:
The correct answer is B)About 5 percent
Explanation:
The approximate total size of the human nuclear genome is 3,200,000,000 base pairs. 1 to 1, 4% encode proteins, 24% are non-coding regions and the rest correspond to intergenic regions.
Of the total base sequence in human DNA, only about 5 percent code for proteins (Option B).
DNA is a double helix molecule composed of two long chains of nucleotides.This molecule (DNA) is composed of sequences that encode proteins called genes and non-coding regions, which often play regulatory functions (i.e., non-coding nucleotide sequences are mainly involved in the regulation of gene expression).According to the human genome sequencing project, only 5% (or even a lesser proportion) of the human genome encode for proteins, thereby the remaining DNA consists of repetitive non-coding sequences.In conclusion, of the total base sequence in human DNA, only about 5 percent code for proteins (Option B).
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Describe the difference between Al3+
and N3-
What is the meaning of the word organism
Answer:
B) any complex thing with properties normally associated with living things
Answer:
Organism is a creature such as plant ,animals and living things or a single-celled life form
Explanation:
The living creature is compared with the interdependent part of the organism. Some of the Example for the organism is dog, bacteria or unicellular animal-like amoeba. This organism can be classified by naming and grouping. The biology name of an organism is called Taxonomy. Classification of an organism help in exploring the unknown potential of many helpful organisms.Due to their classification we can restore the ecosystem, which is imbalanced today.
2Al + 3H2SO4->Al2(SO4)3+H2
a) how many grams of aluminum sulfate would be formed if 250g h2SO4 completely reacted with aluminum
287.39 grams of Al2(SO4)3 is formed if 250g H2SO4 completely reacted with aluminum.
Explanation:
Balanced chemical equation:
2Al + 3H2SO4->Al2(SO4)3+H2
Data given:
atomic mass of Al2(SO4)3 = 342.14 gram/mole
mass of H2SO4 given = 250 gram
atomic mass of one mole of H2SO4 = 98.079 grams/mole
number of moles = [tex]\frac{mass}{atomic mass of one mole}[/tex]
number of moles = [tex]\frac{250}{98.079}[/tex]
number of moles = 2.54 moles
from the equation it can be seen as
3 moles of H2SO4 will react to give 1 mole Al2(SO4)3
2.54 moles of H2SO4 will react to give x moles of Al2(SO4)3.
[tex]\frac{1}{3}[/tex]= [tex]\frac{x}{2.54}[/tex]
x = 0.84 moles of Al2(SO4)3 is formed.
to calculate mass of the Al2(SO4)3 = Number of moles x atomic weight of one mole
= 0.84 x 342.14
= 287.39 grams of Al2(SO4)3 is formed.
What charge will an ion of phosphorus form?
Answer:
A charge of -3
Explanation:
If you look on a periodic table you will find that phosphorus is 3 elements away from the nearest noble gas argon. This means that phosphorus would prefer a charge of -3!
Answer:typically it will be -3
Explanation:
It prefers to take up 3 electrons and thereby become phosphide with a -3 charge. since it is a nonmetal it will take up electrons making it negative as an ion. In order to fill up its last shell, to become stable, to form an octet it will need 3 added electrons which will give it that -3 charge. An atom of phophorus will be neutral, An ion of phsphorus will have a -3 charge.
determine the relationship between wavelength and frequency
Answer:
Explanation:
Wavelength and frequency are related by the velocity equation of waves.
Velocity = f x ∧
where f is the frequency
∧ is the wavelength
Frequency of a wave is the amount of that wave that passes through a point at a particular time.
Wavelength of a wave is the distance between two successive crests and trough.
Velocity of a wave is the speed of a wave
How much mercury and oxygen could be obtained from 21.7g of mercury (II) oxide
20.06 g of Hg and 1.6 g of O₂
Explanation:
To Find:
Number of Mercury and oxygen that can be obtained from 21.7 g of HgO
First we have to write the balanced equation for the decomposition reaction of Mercury(II) oxide as,
2 HgO (s) → 2Hg(l) + O₂ (g)
21.7 g of HgO = [tex]\frac{21.7 g}{216.59 g / mol}[/tex]
= 0.1 mol of HgO.
As per the above equation, we can find the mole ratio between HgO and Hg is 1: 1 and that of HgO and oxygen is 2:1 .
So amount of Hg produced = 0.1 mol × 200.59 g / mol ( molar mass of Hg)
= 20.06 g of Hg
Amount of oxygen produced = 0.05 mol × 32 g/ mol = 1.6 g of O₂
Thus it is clear that 20.06 g of Hg and 1.6 g of O₂ is obtained from 21.7 g of HgO
Final answer:
From 21.7g of mercury (II) oxide, approximately 20.059 g of mercury and 1.6 g of oxygen can be produced through the decomposition reaction. This calculation uses the stoichiometry of the reaction and the molar masses of the substances involved.
Explanation:
To determine how much mercury and oxygen could be obtained from 21.7g of mercury (II) oxide, we need to consider the decomposition reaction of mercury (II) oxide under standard state conditions:
2HgO(s, red) → 2Hg(l) + O2(g)
By using the molar mass of mercury (II) oxide (216.59 g/mol), we can convert the mass of mercury (II) oxide to moles:
21.7 g HgO × (1 mol HgO / 216.59 g HgO) = 0.1 mol HgO
Following the stoichiometry of the reaction, 0.1 moles of HgO will produce 0.1 moles of Hg and 0.05 moles of O2, since 2 moles of HgO decompose to produce 1 mole of O2. We can then calculate the mass of mercury and oxygen produced:
0.1 mol Hg x (200.59 g Hg/mol) = 20.059 g of Hg
0.05 mol O2 x (32 g O2/mol) = 1.6 g of O2
Therefore, 21.7g of mercury (II) oxide will produce approximately 20.059 g of mercury and 1.6 g of oxygen.
What mass of K2SO4 What do you need to prepare 1200 g of an 8% K2SO4 m/m solution
Answer:
96 grams are required.
Explanation:
Given data:
Mass of K₂SO₄ required = ?
Mass of K₂SO₄ from = 1200 g of 8%
Solution:
Formula:
m/m% = mass required / mass given
Now we will put the values:
8%= x / 1200 g
8/100 = x / 1200 g
0.08 = x / 1200 g
0.08 × 1200 g= x
x = 96 g
So 96 gram of 1200 g is required.
100 Points!! PLEASE HELP!! PLEASE!! PLEASE!!
The Universe is believed to have been formed from a very dense fireball _____________ of years ago. As the fireball
expanded and cooled stars and galaxies formed. The fireball explosion is often called the ___ ________. The explosion
threw all the material outwards; that is why scientists believe the universe is getting bigger or ____________. Scientists
have confirmed that the Universe is expanding by examining the light given off by stars. Astronomers now know that the
distance to the furthest galaxies is becoming greater as these galaxies are moving away the __________. Stars are
produced from gas clouds or ___________, which contain mainly the element ____________. The type of star produced
depends on the mass of the star. Red _________ are stars formed which have a mass _________ than that of our
____________ .
Hydrogen is the __________ of all stars. During nuclear fusion the hydrogen molecules combine producing
____________, releasing lots of ____________ in the process. How quickly the hydrogen is used up depends on the size
of the star. Massive stars burn hydrogen very quickly. Additional nuclear fusion reactions can convert helium into
elements with larger atoms, for example lithium. However the elements with the largest atoms only form when a star
explodes as a _______________
The amount of energy given out by a star, its luminosity, varies considerably. ____________ dwarfs are stars that have a
very low luminosity, about one hundredth of the Sun. Super giant stars which are very large red giant stars, can give out
as much energy as 1,000,000 Suns. Some scientists believe that our Solar System was once a binary star system. The Sun
was the __________ of the two stars and burnt its fuel slowly, lasting millions of years. The larger star used up all its fuel
and destroyed itself in a supernova explosion, leaving the Sun behind.
The Sun is a very stable star. In a few billion years from now the Sun will use up its fuel supply and start to change. It will
probably expand and form a red giant. Finally, it may form a white dwarf or a ____________ star. When this happens
there will no longer be life on the Earth, but by then we should have found new _________ around other stars.
Your answer choices are fuel, nebula, expanding, less, hydrogen, smaller, energy, Sun, quickest, supernova, homes, white, neutron, giants,
helium, Big Bang, billions
Answer:
(13) billions
Big bang
expanding
quickest
nebula
hydrogen
giants
less,sun
fuel
helium
energy
supernova
white
smaller
neutron
planets/homes
1) ____ NaCl + ____ KOH ____ NaOH + ____ KCl
2) ____ MgO + ____ Li2SO4 ____ MgSO4 + ____ Li2O
3) ____ H2O ____ H2 + ____ O2
4) ____ RbF + ____ Be(NO3)2 ____ RbNO3 + ____ BeF2
5) ____ Ag +____ Cu(NO3)2 ____ AgNO3 + ____ Cu
6) ____ CO2 + ____ Cl2 ____ CCl4 + ____ O2
7) ____ CuSO4 + ____ HCN ____ Cu(CN)2 + ____ H2SO4
8) ____ Ga2O3 + ____ Li ____ Li2O + ____ Ga
9) ____ BaF2 + ____ Na2S ____ BaS2 + ____ NaF
10) ____ NH3 ____ N2 + ____ H2
please solve as many as you can, the boxes are arrows
Answer:
hope it's helpful to you .
your 9th question is wrong but I did it correctly
it's not BaS2 it's BaS
The student's inquiry involved balancing a series of chemical equations, a fundamental concept in stoichiometry. Each balanced equation ensures that there is the same number of each element's atoms on the reactant side as on the product side, in accordance with the law of conservation of matter.
Explanation:The questions you've posed involve stoichiometry, a field in chemistry that quantifies the relationships of different substances in a chemical reaction. Balancing chemical equations involves ensuring the conservation of atoms (each element in reactants should be equal to the count of the same element in products). Here are the balanced equations:
2 NaCl + 2 KOH → 2 NaOH + K2Cl2MgO + Li2SO4 → MgSO4 + 2Li2O2 H2O → 2 H2 + O22 RbF + Be(NO3)2 → 2 RbNO3 + BeF22 Ag + Cu(NO3)2 → 2 AgNO3 + CuNo reaction occurs in this case.3 CuSO4 + 6 HCN → 3 Cu(CN)2 + 3 H2SO46 Li + Ga2O3 → 3 Li2O + 2 Ga2 Na2S + BaF2 → BaS + 4 NaF2 NH3 → N2 + 3 H2Learn more about Balancing chemical equations here:
https://brainly.com/question/28294176
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Is breaking a pretzel physical change or chemical change
Please Help
In an acid-base reaction, the _______ are a salt and water. A) acid B) base C) reactants D) products
Answer:
D
Explanation:
In an acid base reaction, the products are salt and water because acid base reactions react to neutralize the acid and base properties, producing a salt.