Answer: oxide
Explanation:..
Explain the 2 main differences between ionic and covalent bonds and identify if the compound CaF2
will have an ionic or covalent bond and why.
Answer:
yes. because look at the equation it will have an ionic bond
Explanation:
Uranium-235 undergoes nuclear fission as shown in the diagram below. A small gray ball labeled n impacts a large mass of red and gray balls labeled superscript 235 subscript 92 upper U. The impact gives off a smaller mass of balls labeled superscript 139 subscript 56 upper B a, a starburst labeled 200 megavolts, which in turn gives off 2 balls labeled n; and another smaller mass of balls labeled X. Which element does X represent? Superscript 95 Subscript 36 Baseline Upper K r Superscript 96 Subscript 36 Baseline Upper K r Superscript 97 Subscript 36 Baseline Upper K r Superscript 98 Subscript 36 Baseline Upper K r
Answer:
95/36 Kr or A
Explanation:
In the given nuclear fission reaction, X represents ⁹⁵₃₆Kr. Therefore, the correct option is option A.
What is nuclear fission?Nuclear fission is the splitting of a nucleus of heavy atoms, such that of plutonium or uranium, into two roughly equal mass fragments. A significant amount of energy is released during the process. The core of an atom splits into two nuclei that are lighter during nuclear fission.
When the nucleus is excited by a variety of particles (such as neutrons, protons, deuterons, and alpha particles) or by electromagnetic radiation takes the form of gamma rays, the process may occur spontaneously or be induced. In the given nuclear fission reaction, X represents ⁹⁵₃₆Kr.
Therefore, the correct option is option A. In the given nuclear fission reaction, X represents ⁹⁵₃₆Kr.
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Your question is incomplete but most probably your full question was,
What must a scientist do in order to develop a testable hypothesis?
A. Research accepted scientific theories to find one that is wrong.
B. Determine whether the conclusion is supported by popular opinion.
C. Find out whether the idea would be interesting to other scientists.
D. Ask a question that can be answered by making observations.
Answer:
The correct answer is D. Ask a question that can be answered by making observations.
Explanation:
Basically, in order to develop a testable hypothesis, scientists must adhere to the guidelines of the scientific method.
The scientific method is usually understood to be a so-called hypothetical-deductive method, the core of which is to make hypotheses based on observations or measurements, to make predictions based on them and to check the validity of predictions by repeated experiments. More generally, the scientific method is a general way of obtaining solid knowledge, using many means of proof, both empirical and theoretical, to achieve certainty. The scientific method is a widely recognized tool in the scientific community for seeking objectivity, reliability and transparency in research.
I’m trying to answer this question
Answer:
her speed is constant as she runs, and her av. speed is 3 m/sec
Explanation:
av speed is total distance divided by total time, so 150/50=3
Which one of the following is not a metal catalyst for the hydrogenation of an alkene?a. Pdb. Ptc. Nad. Ni
Explanation: nad .......
Sodium is not use, as a metal catalyst for the hydrogenation of an alkene. Therefore, option C is correct.
What is hydrogenation ?Hydrogenation is the chemical reaction that occurs when molecular hydrogen reacts with another compound or element, typically in the presence of a catalyst such as nickel, palladium, or platinum. Organic compounds are commonly reduced or saturated using this method.
A hydrogenation reaction is an example of an alkene addition reaction. Two hydrogen atoms are added across the double bond of an alkene in a hydrogenation reaction, resulting in a saturated alkane.
To activate the chemical reaction between hydrogen and another compound, hydrogenation catalysts, typically made of iridium, nickel, palladium, platinum, rhodium, or ruthenium, are used.
Therefore, option C is correct.
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. FAST PLEASE HELP Which of the following is true about ALL energy transformations?
Energy never changes forms, only the amount of energy changes
The end product of all energy transformations is chemical energy
The end product of all energy transformations is electrical energy
Energy is never lost, it just changes from one form to another
Answer:
Energy is never lost, it just changes from one form to another
What Celsius temperature, T2, is required to change the volume of the gas sample in Part A (T1 = 42 ∘C , V1= 1.10×103 L ) to a volume of 2.20×103 L ? Assume no change in pressure or the amount of gas in the balloon.
Answer:
The temperature that is required is 357 C.
Explanation:
Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is maintained at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Now it is possible to assume that you have a certain volume of gas V1 that is at a temperature T1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the temperature will change to T2, and it will be true:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 1.10*10³ LT1= 42 C= 315 K (being 0 C=273 K)V2= 2.20*10³ LT2= ?Replacing:
[tex]\frac{1.10*10^{3}L }{315 K} =\frac{2.20*10^{3}L }{T2}[/tex]
Solving:
[tex]T2=\frac{2.20*10^{3}L }{ \frac{1.10*10^{3}L }{315 K} }[/tex]
T2=630 K= 357 C
The temperature that is required is 357 C.
Use the following balanced equation to answer the following questions:
CH4 + 2 O2 → CO2 + 2 H2O
For every 10 g of CH4 reacted, how many grams of CO2 is produced?
NEED ASAP
Answer:
27.5 gram
Explanation:
16 gram CH⁴ gives 44 gram CO²
1 gram CH⁴ gives 44/16 gram CO²
10 gram CH⁴ gives (44/16)×10 gram CO²=27.5 gram Co²
Steve wants to investigate the expansion and contraction of gases at different temperatures. He knows that at higher temperatures, gas particles move faster. His hypothesis is that at higher temperatures the faster particle motion causes gas to expand. He fills three balloons with the same amount of gas and heats the gas in each balloon to different temperatures. The test (independent) variable is the temperature of the gas. Which statement describes how the outcome (dependent) variable changes as a result of the changes made to the tested (independent) variable?
Answer: C. Gas particles move faster and farther apart at higher temperatures.
Explanation:
The options include:
A. the number of gas particles increases at higher temperatures
B. the number of gas particles decreases at higher temperatures
C. gas particles move faster and farther apart at higher temperatures
D. gas particles move more slowly and get closer together at higher temperatures
The statement that describes how the outcome (dependent) variable changes as a result of the changes made to the tested (independent) variable is that gas particles move faster and farther apart at higher temperatures.
It should be noted that the particles in the gases will collide more frequently with one another because of the shorter space that is between them.
The increase in the temperature will bring about a faster movement of the particles which in turn, brings about a rise in the diffusion rate and also the collision rate.
Sulfuric acid, H 2 S O 4 , is an important industrial chemical, typically synthesized in a multi-step process. What is the percent yield if a batch of H 2 SO 4 has a theoretical yield of 3.4 kg, and 2.7 kg are obtained at the end of the process
Answer:
79.4 %
Explanation:
From the question given above, the following data were obtained:
Theoretical yield = 3.4 kg
Actual yield = 2.7 kg
Percentage yield =?
Percentage yield is simply defined as the ratio of the actual yield to that of the theoretical yield multiplied by 100 i.e
Percentage yield = Actual yield/Theoretical yield × 100
With the above formula, we can obtain the percentage yield as follow:
Theoretical yield = 3.4 kg
Actual yield = 2.7 kg
Percentage yield =?
Percentage yield = Actual yield/Theoretical yield × 100
Percentage yield = 2.7/3.4 × 100
Percentage yield = 79.4 %
Thus the percentage yield is 79.4 %
The percent yield is 79.4%
Percentage yieldFrom the question,
We are to determine the percent yield.
Percent yield is given by the formula,
[tex]Percent\ yield = \frac{Actual\ yield}{Theoretical yield } \times 100\% [/tex]
From the given information,
Actual yield = 2.7 kg
Theoretical yield = 3.4 kg
Putting the parameters into the formula,
[tex]Percent\ yield = \frac{2.7}{3.4} \times 100\% [/tex]
Then,
[tex]Percent\ yield = 0.7941176\times 100\% [/tex]
[tex]Percent\ yield = 79.4\% [/tex]
Hence, the percent yield is 79.4%
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PLEASE HELP!!!! WILL GIVE BRANLIEST!!
Answer:
help with what...
..
........
What is the scientific name for the substance that is dissolving in a solution?
Answer:
The solute is the substance that is being dissolved,
Explanation:
A solution is a homogeneous mixture consisting of a solute dissolved into a solvent .
Answer:
solutes
Things which dissolve are called solutes and the liquid in which they dissolve is called a solvent to form a solution. Strongly polar substances easily attract water molecules. The water molecules surround the charged solute.
Explanation:
Took the same test and that was the one that was right hope this helps you
Complete the mechanism for the electrophilic addition when the alkene is treated with water in acid.
Answer:
CH₃CH == CH₂ + H₂O → H⁺ → CH₃CH(OH)CH₃ + H⁺
The reaction of propene and water in acidic medium produces isopropyl alcohol.
Explanation:
Let's propose the following reaction:
Propene + H₂O in H⁺ medium → Alcohol
CH₃CH == CH₂ + H⁺ → CH₃C⁺CH₂
Electrons from the double bond attack the proton. So the double bond is broken and you form a carbocation.
Carbocation will be attacked by the electrons from the oxygen on the molecule of water.
CH₃C⁺CH₂ + H₂O: : → CH₃ _CH _ CH₃
|
⁺OHH
It is called electrophilic addition cause the proton which is the electrophile is added to the sp₂ carbon in the alkene (where many H are bonded), and the nucleophile, water is added to the other sp₂ carbon.
This last attack is so fast that the carbocation is combined with any nucleophile which it collides first. In the hydration reaction, there are two nucleophiles: water and the anion from the acid (let's think Cl⁻, cause our medium can be HCl). The product of this collision is a protonated alcohol. Since we know that protonated alcohols are very strong acids, this protonated alcohol loses a proton, and the end product of the addition reaction is an alcohol.
In the first step, a proton adds to the alkene, but is returned to the reaction mixture during the final step, when the alcohol is deprotonated.
CH₃ _CH _ CH₃ → CH₃ _CH _ CH₃ + H⁺
| |
⁺OHH OH
Aluminum reacts with chlorine gas to form aluminum chloride
via the following reaction:
2A1 + 3Cl2 + 2AlCl3
How many grams of aluminum chloride could be produced by
reacting 34.0 g of aluminum and 39.0 g of chlorine gas?
Mass is the multiplication product of moles and the molar mass of the substance. The mass of aluminum chloride in the reaction is 48.95g.
What are grams?Grams are the unit of the measurement of the substance used to calculate the weight of the substance in a compound or molecule.
The balanced chemical reaction is given as:
[tex]\rm 2Al (s) + 3Cl_{2} (g) \rightarrow 2AlCl_{3} (s)[/tex]
Given,
Mass of aluminium = 34.0 gm
Mass of chlorine gas = 39.0 gm
The moles of aluminum is calculated as:
[tex]\dfrac{34}{27} = 1.26[/tex]
The moles of chlorine gas are calculated as:
[tex]\dfrac{39}{2 \times 35.5} = 0.55[/tex]
From the moles, it can be seen that aluminum is in excess so further calculations will be done based on the moles of chlorine gas.
Moles of aluminum chloride are calculated as:
[tex]\dfrac{0.5500 \;\rm mol \; Cl_{2} \times 2 \;\rm mol \; AlCl_{3}}{3 \;\rm mol \; Cl_{2}} = 0.3667 \;\rm mol \;\rm AlCl_{3}[/tex]
Moles of aluminum chloride are 0.3667 and the molar mass is 133.341 g/mol. The mass is calculated as:
[tex]0.3667 \times 133.341 = 48.8961[/tex]
Therefore, 48.95 gm is the mass of aluminum chloride.
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Calculate the distance Jupiter in miles if it has an AU of 5.2
93,000,000 miles
O 465,400,000 miles
O 483, 600, 000 miles
How many Joules of heat will be given off by 55.0g of water as it cools from 87.3°C to 25.0°C?
Answer:
Q = -14322.77 J
Explanation:
Given data:
Mass of water = 55.0 g
Initial temperature = 87.3°C
Final temperature = 25.0 °C
Heat given off = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of water is 4.18 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 25.0 °C - 87.3°C
ΔT = - 62.3 °C
Q = 55.0 g×4.18 J/g.°C × - 62.3 °C
Q = -14322.77 J
Which of the following most readily undergoes an E2 reaction with sodium ethoxide (NaOCH2CH3)?A) (CH3)CF.
B) (CH3)CCl.
C) (CH3)CBr.
D) (CH3)CI.
Answer:
(CH3)CI
Explanation:
As we move down the group, the halogen atoms become more easily polarizable and the C-X bond is more easily broken.
Recall that E2 mechanism has to do with synchronous proton abstraction and loss of the halogen.
These occur faster with (CH3)CI than when the C-X bond involves other halogens.
Explain how the ability of dilute sulphuric (vi) acid to conduct an electric current compares with that of concentrated sulphuric (vi) acid
Answer:
Explanation:
Hnsnsnsnsnqnananana
Which option is correct ?
why sodium chloride has a hiegher melting point
Answer:
Explanation:
Sodium chloride has a high melting and boiling point
There are strong electrostatic attractions between the positive and negative ions, and it takes a lot of heat energy to overcome them. Ionic substances all have high melting and boiling points.
121
P(1)(1 + i)
1 + 11) 121 - 1
M = (1 + )
Answer:
121
Explanation:
add 1+120 to get answer
Given that nitrogen forms three bonds with hydrogen to make [tex]NH_{3}[/tex], how many hydrogen atoms do you think will bond with an atom of phosphorus, which is in the same family as nitrogen? Explain your reasoning.
Answer:
Three hydrogen atoms to form PH₃.
Explanation:
Hello!
In this case, since the elements belonging to the nitrogen family (N, P, As, Sb and Bi) show five valence electrons, because there are five electrons at their outer shell, it is clear that if phosphorous bonds with hydrogen, it is going to require the same amount of oxygen atoms (3) because elements having five valence electrons need 3 bonds in order to attain the octet (5+3=8).
Therefore the compound would be:
[tex]PH_3[/tex]
Which is phosphine.
Best regards!
What is the molecular formula of aluminum chloride containing 20.2% by mass of aluminum and 79.8% My mess of chlorine. The relative molecular mess is 267 g.
The molecular formula : Al₂Cl₆
Further explanationGiven
20.2% by mass of Aluminum and 79.8% by mass of Chlorine.
Required
the molecular formula
Solution
Empirical formulaAluminium (Ar=27 g/mol)
[tex]\tt \dfrac{20.2}{27}=0.748[/tex]
Chlorine(Ar=35.5 g/mol)
[tex]\tt \dfrac{79.8}{35.5}=2.248[/tex]
mol ratio Al : Cl =
[tex]\tt \dfrac{0.748}{0.748}\div \dfrac{2.248}{0.748}=1\div 3[/tex]
So the empirical formula = AlCl₃
(Empirical formula)n=Molecular formula
(27+3.35.5)n=267
(133.5)n=267⇒n=2
The molecular formula : Al₂Cl₆
How did Mendeleeb come up woth the periodic table?
Answer:
Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.
Answer:
On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table. So convinced was he of the soundness of his periodic law that he left gaps for these elements in his table.
Why are marine mammals so important
what is a chemical equation for the corrosion of metal
Answer:
[tex]M+e^-\rightarrow M^+[/tex]
Explanation:
Hello!
In this case, since corrosion is a reaction by which a metal is oxidized to a form in which it has a higher oxidation state due to the fact that it loses electrons and therefore it becomes positively charged. In such a way, for a general metal M, we could have the following corrosion reaction:
[tex]M+e^-\rightarrow M^+[/tex]
The amount of electrons and the resulting oxidation state depend upon the nature of the metal, for instance, we can see it for silver, zinc and aluminum:
[tex]Ag+e^-\rightarrow Ag^+\\\\Zn+2e^-\rightarrow Zn^{2+}\\\\Al+3e^-\rightarrow Al^{3+}[/tex]
Best regards!
What is the mass of 0.20 moles of Ga₂(SO₃)₃?
Answer:
75.924 g
Explanation:
To answer this question we first need to calculate the molar mass of Ga₂(SO₃)₃:
Molar Mass of Ga₂(SO₃)₃ = (Molar Mass of Ga)*2 + (Molar Mass of SO₃)*3
Molar Mass of SO₃ = Molar Mass of S + (Molar Mass of O)*3 = 80.06 g/molMolar Mass of Ga₂(SO₃)₃ = (69.72 g/mol)*2 + (80.06 g/mol) * 3
Molar Mass of Ga₂(SO₃)₃ = 379.62 g/molThen we convert 0.20 moles to grams, using the molar mass of Ga₂(SO₃)₃:
0.20 mol Ga₂(SO₃)₃ * 379.62 g/mol = 75.924 gMass of 0.20 moles of Ga₂(SO₃)₃ is 75.924 g
Number of moles:It is defined as the ratio of given mass over molar mass.
Given:
Number of moles= 0.20 moles
To find:
Mass=?
We need to calculate molar mass of Ga₂(SO₃)₃ first:
Molar Mass of Ga₂(SO₃)₃ = (Molar Mass of Ga)*2 + (Molar Mass of SO₃)*3
Molar Mass of SO₃ = Molar Mass of S + (Molar Mass of O)*3 = 80.06 g/mol
Molar Mass of Ga_2(SO_3)_3 = (69.72 g/mol)*2 + (80.06 g/mol) * 3
Molar Mass of Ga₂(SO₃)₃ = 379.62 g/mol
Then we convert 0.20 moles to grams, using the molar mass of Ga₂(SO₃)₃:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} \\\\\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}=0.20 moles*379.62 g/mol\\\\\text{Given mass}=75.92 grams\\[/tex]
Thus, the mass of 0.20 moles of Ga₂(SO₃)₃ is 75.92 grams.
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2. How can where you live affect the amount of available water to use?
Answer:
Water is life, as the saying goes. We rely on water for our food, our health, our livelihoods, and for fun and leisure. But water can also take away life, and the absence of water can be even worse. Currently, 700 million people live in water-stressed areas. By 2025, this number is expected to grow 1.8 billion — about 25% of the world population.
As Number 6 on the UN’s Sustainable Development Goals, “Clean Water and Sanitation For All” is currently struggling. The UN suggests that, if we want to meet this goal by the deadline of 2030, we’ll need to double our current rate of progress to ensure that there’s universal access to safe and affordable drinking water, adequate sanitation and hygiene resources, improved water quality, and restored water-related ecosystems. Here are 5 ways that water affects our lives — and what we’re doing to help make them happen.
Explanation:
Many of the towns we live in were built near water sources. Oceans, rivers, streams and lakes make up some of our geographical boundaries. They also allow for water transportation and commerce and provide food and other resources.
How does wood produce chemical energy?
Wood absorbs oxygen to produce chemical energy.
Wood absorbs solar radiation to make chemical energy
Wood absorbs nitrogen gas to make chemical energy.
All living organisms produce unlimited amount of chemical energy.
Answer:
Wood absorbs solar radiation to make chemical energy.
The chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.
The wood has been the source of energy by the burning for a long duration. The chemical energy has been stored in the dry wood has been converted to light and heat energy on burning.
The energy stored in the wood has been comprised by photosynthesis, where the solar energy has been entrapped in the wood and is converted to chemical energy that is stored.
Thus, the chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.
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Element X has two known isotopes. If 83% of the sample weighs 76 amu and the remaining 17% weighs 73.6 amu, what is the atomic mass of element X
Answer:
The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)