Explanation:
beryllium, calcium, strontium, barium, and radium; they are in the same group of table.
Answer:
Both Beryllium and Calcium have 2 valence electrons, i.e. in ther electronic configuration there are 2 electrons remaining in the outermost shell. Thus their valencies are also 2.
Electronic Configurations:
Beryllium (4) : - [2, 2]
Calcium (20) : [2, 8, 8, 2]
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a. both are very reactive
b. both react readily with elements in group 1
c. both rarely combine with other elements
d. both are rare metals
(As per the suggestion of bvbfanforeverap5j54d)
EXPLAIN Before medical images are taken, radioisotopes are often injected into a vein in a patient’s arm, or the patient drinks a solution containing the radioisotopes. Why do
you think atoms in the body usually do not emit radiation?
Answer: adioisotopes, are species of chemical elements that are produced through the natural decay of atoms. Exposure to radiation generally is considered harmful to the human body, but radioisotopes are highly valuable in medicine, particularly in the diagnosis and treatment of disease.
Explanation:
Separating mixtures into their components depends on the differences in the components'
A. phases
B. states of matter
C. physical properties
D. chemical properties
Answer:
D
Explanation:
chemical properties
I'm not sure abt it but hope that helps
How many grams of chromium are in 2.0 x 1024 atoms
Answer: 173 g ( 0.17 kg in right accuracy)
Explanation: Amount in moles is n = N/Na = 2.0·10^24 / 6.022·10^23 (1/mol).
n = 3.32116 mol. M(Cr) = 52.00 g/mol and mass m = nM = 172.7 g
which statements describe what happen in a redox reaction?
a. one atom gains electrons and one loses electrons
b. the cations on two substances trade places
c. electrons move from one substance to another
d. there are two oxidation reactions
Answer:
A or C
Explanation:
I don't know if I'm correct but I think it's A or C you don't have to choose them.
Explain, in terms of subatomic particles in energy states, how the colors in a fireworks display are produced
Salts are heated to extremely high temperatures during a display of fireworks. The salts' ions pick up energy and get excited. Exciting hues are created as energy in the form of light is emitted from the ions. Each salt's metal ion can be identified by the hue of the light that is emitted.
What are subatomic particles?Subatomic particles refer to the three fundamental particles that make up the atom.
The subatomic particles include:
electronsprotons, and neutronsElectrons occupy several energy states. When electrons gain energy, they move to a higher energy state. The electrons on returning to a lower energy state emit radiation that is seen as several light color displays in fireworks.
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If a dog has a mass of 17.3 kg, what is its mass in the following units? Use scientific notation in all of your answers.
Answer:
what are the following units????
Explanation:
MY DOG WAS FAT BUT HE GOES TO GYM NOW, CAN BENCH LIFT 100 LBS :D
JK
Help me please please i is in middle school need help ple
the answer is that it is a
Suppose the galvanic cell sketched below is powered by the following reaction: (s)(aq)(aq)(s) Write a balanced equation for the half-reaction that happens at the cathode of this cell. Write a balanced equation for the half-reaction that happens at the anode of this cell. Of what substance is E1 made? Of what substance is E2 made? What are the chemical species in solution S1? What are the chemical species in solution S2?
Answer:
Hello the required Image related to your question is missing attached below is the missing Image
answer :
a) Ni²⁺(aq) + 2e⁻ ⇒ Ni(s)
b) Fe(s) ⇒ Fe²⁺(aq) + 2e⁻
c) Fe (s)
d) Ni ( s )
e) Fe²⁺(aq) and SO⁻²₄ (aq)
f) Ni²⁺(aq) and SO⁻²₄(aq)
Explanation:
a) Balanced equation for the half-reaction at the cathode of the cell
Ni²⁺(aq) + 2e⁻ ⇒ Ni(s)
b) Balanced equation for half reaction at the anode of the cell
Fe(s) ⇒ Fe²⁺(aq) + 2e⁻
c) E1 is made of Fe (s)
d) E2 is made of Ni ( s )
e) chemical species in solution S1 = Fe²⁺(aq) and SO⁻²₄ (aq)
f) Chemical species in solution S2 = Ni²⁺(aq) and SO⁻²₄(aq)
If sugar was broken back down into CO2 and H2O what kind of change would that be?
A. Chemical change
B. Radical change
or
C. Physical change
Answer: chemical change
Let's repeat this process for the atoms that make up the substances that do not conduct when dissolved in water. What do you notice now?
Answer:
Explanation:
If they do not disolve in water they are non electrolyte and hence will not conduct eletricity. If you had a lab where a batter was supplying power and the wire carryin the electricity went through a water bath if the water was pure and nothing disolved in it the light would not turn on but if you added something like salt it would conduct the electricity
What are greenhouse gases?
How many grams would 8.88 x 1029 atoms of NaCl be equivalent to?
Answer:
8.65x10 7 grams of nacl
Explanation:
There are 6.02x10 23 atoms per one mol
so
8.88x 10 29 x (1/6.02 x 10 23)
Will give us mols of NaCl
to go from mols to grams we multiple mols by molar mass
so
1.48x10 6 mols of Nacl x 58.44 g/mol = 8.65x10 7 grams of nacl which can be converted to
86500 kg
A student is studying the rate of the following reaction: C2H4O NaOH --> H20 NaC2H3O Knowing that this is an exothermic reaction, he is measuring the rate of the reaction by timing how quickly the reaction vessel heats up. He notices that if he adds HCl to this reaction, the rate increases dramatically. He also determines that the HCl is being used up during the reaction. Is the HCl a catalyst for this reaction.
Answer:
HCl is not a catalyst because these are not used up during the chemical reactions.
Explanation:
Hello there!
In this case, according to the performed experiments, it is possible for us to realize that HCl cannot be a catalyst for this reaction because it is used up during the reaction. This is explained by the fact that catalyst are able to return to the original form once the reaction has gone to completion; this is the example of palladium in the hydrogenation or dehydrogenation of hydrocarbons depending on the case. Moreover, we know that the catalysts increase the reaction rate because they decrease the activation energy of the reaction and therefore the student observed such increase.
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Why don’t different varieties of corn plants grow to the same size under similar growing conditions?
"Calculate the pH of a 0.15 M HBr solution AND classify the solution of acidic, neutral, and basic"
a. 0.82 basic
b. 0.82 acidic
c. 13.9 basic
d.13.9 acidic
Answer:
la respuesta es la letra: b
The indicator methyl red has different molecular structures at high and low pH.
a. True
b. False
Answer:
a. True
Explanation:
Methyl red is an indicator widely used in quality control of oxides as Zinc oxide in the titration with sulfuric acid.
As is used in titrations of acid-base reactions the indicator change in colour. Is red when the pH < 4.4 (Acidic Solutions) and is yellow when pH > 6.2 (Neutral-Basic solutions).
A change in colour means the structure of the indicator is changing with pH. Thus, the answer is:
a. TrueIf you started with 23g of Mg and 412 ml of 2.6M HCl, find the limiting reactant. If you collected the hydrogen gas over water at a temperature of 81OC, what is the volume of just the water if the total pressure is 2.23 atm? How many grams of water vapor are in the container?
Answer:
See explanation.
Explanation:
Hello there!
In this case, according to the description of the chemical reaction, it is possible to write the corresponding equation as follows:
[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]
Whereas we are given the mass of magnesium and the concentration and volume of HCl; it means that we can calculate the moles of hydrogen yielded by each of these reactants in order to identify the limiting reactant:
[tex]m_{H_2}^{by\ Mg}=23gMg*\frac{1molMg}{24.305gMg}*\frac{1molH_2}{1molMg}=0.95gH_2 \\\\m_{H_2}^{by\ HCl}=0.412L*2.6\frac{molHCl}{1L}*\frac{1molH_2}{2molHCl}*=0.54gH_2[/tex]
Therefore, we infer that the limiting reactant is HCl as it yields the fewest moles of hydrogen. Next since the vapor pressure of water at 81 °C is about 0.4675 atm we infer that the pressure of hydrogen is 2.23 atm - 0.4675 atm = 1.7625 atm. In such a way, we use the ideal gas equation to obtain the volume of hydrogen:
[tex]V_{H_2}=\frac{0.54molH_2*0.08206\frac{atm*L}{mol*K}*(81+273.15)K}{1.7625atm} \\\\V_{H_2}=8.9L[/tex]
Finally, since the pressure of water is 0.4675 atm and the volume is the same for both, we obtain the moles of water and subsequently the required grams as shown below:
[tex]n_w=\frac{0.4675atm*8.9L}{0.08206\frac{atm*L}{mol*K}*(81+273.15)K} \\\\n_w=0.143molH_2O\\\\m_w=0.143molH_2O*\frac{18.02gH_2O}{1molH_2O} =2.6gH_2O[/tex]
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Most energy resources used by humans are nonrenewable. Which of the following is NOT a nonrenewable energy resource?
A coal
B natural gas
C oil
D wind
Answer:D wind
Explanation:
Most energy resources used by humans are nonrenewable. Wind is not a nonrenewable energy resource. Therefore, option D is correct.
What are nonrenewable energy resource ?Energy derived from fossil fuels including coal, crude oil, natural gas, and uranium is referred to as non-renewable energy. Non-renewable energy requires human intervention to make it appropriate for use, in contrast to renewable energy.
Fossil fuels made of carbon are one instance. With the use of heat and pressure, the original biological substance transforms into a fuel like gas or oil.
A renewable energy source is wind power. Water does not pollute, it cannot run out, and it lessens the need for fossil fuels, which are where greenhouse gases that contribute to global warming are produced.
Thus, option D is correct.
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Four hundred and fifty two
bullfrogs live in a marsh that
is sixty eight square
kilometers. What is the
population density of the
bullfrogs
per square
kilometer?
WILL GIVE BRAINLIST
Answer: 6.65 bullfrogs per square
kilometer
Explanation:
The formula to calculate the population density will be:
= N/A
where,
N = total population = 452
A = land area = 68km²
Therefore, population density will be:
= N/A
= 452/68
= 6.65 bullfrogs per square
kilometer
Does sublimation change chemical or physical change
Answer:
Yes, sublimation is a physical change because it involves a change of state from solid to gas of a substance when it is heated.
Reactants are an acid and a base, which one describes this? 1. Acid base 2. Redox 3. Precipitation 4. Combustion
Answer:
The answer is 1. acid-base
Explanation:
This is pretty self-explanatory, when an acid and base react, it is called an acid-base reaction. Redox reactions are where two reactants exchange electrons, precipitation reaction is where a solid is formed, and combustion reaction is where a compound is reacted with oxygen so none of those can be the answer.
The bond that holds together positive and negative ions is
called a(n) bond.
Answer:
Ionic bond
Explanation:
An ionic bond holds positive and negative ions together.
____________Polar regions get less of the sun's direct rays, they are the coldest climates on Earth. A because , B although, C Howerer, D Consequently / what best word fits in the blank space what makes sense.
Answer:
Because Polar regions get less of the sun's direct rays, they are the coldest climates on Earth.
Explanation:
What is the molecular formula of a compound with a molecular mass of 63.0g and an empirical formula of CH3O
Answer:
I think first molar mass of ch3o which is 31
Explanation:
What contains a single element 1. Acid/Base 2. Redox 3. Precipitation
Answer:
hydrogen ion dissolve in water is acid and hydroxide ion dissolve in water is basi
the recation in which oxidation and reduction goes side by side is redox redaction
Give two ways a globe is like the earth and two ways a globe is not like the earth.
Its a homework question and I'm to lazy to think HELP PLEASE
Answer:
A glove is like the earth because...
A globe is like the earth in that it is a three-dimensional representation of the earth's features, such as countries, oceans, and landmasses.
A globe is also like the earth in that it can rotate on its axis, which allows the viewer to see different parts of the earth depending on the angle of rotation.
A globe is not like the earth because...
A globe is not like the earth in that it is typically much smaller than the earth.
A globe is also not like the earth in that it does not depict the earth's relief features, such as mountains and valleys, in their true proportion to the rest of the earth's surface.
A globe is like the earth in that it is a scaled-down, spherical model of the earth's surface, representing physical features accurately. However, a globe is not like the earth because it is much smaller and does not rotate or revolve.
Explanation:The globe and the earth are similar in two main ways. First, a globe is a scaled-down model of the earth, showing an accurate representation of the earth's surface. This includes physical features such as continents, oceans, and countries, which are mapped out precisely. Second, a globe is spherical, just like the earth.
However, there are differences between a globe and the earth. One key difference is the scale: the earth is far larger than any globe. The most obvious point of difference is the size: while a globe is small enough to be held in your hands or placed on a desk, the earth has a diameter of approximately 7,917.5 miles. Also, the globe is a static object, it does not rotate on its axis or revolve around the sun like the earth does.
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how many grams of hexane(C6H14) would be need to make 562 of carbon dioxide
The mass of hexane, C₆H₁₄ that would be needed to produce 562 grams of carbon dioxide, CO2 is 183 g
How do I determine the mass of hexane, C₆H₁₄ needed?We'll begin by writing the balanced equation for the reaction.
2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O
The following are obtained from the equation:Molar mass of C₆H₁₄ = 86 g/molMass of C₆H₁₄ from the balanced equation = 2 × 86 = 172 g Molar mass of CO₂ = 44 g/molMass of CO₂ from the balanced equation = 12 × 44 = 528 gFrom the balanced equation above,
528 g CO₂ were produced from 172 g of C₆H₁₄
With the above information, we shall determine the mass of hexane, C₆H₁₄ needed to produce 562 g CO₂. Details below:
From the balanced equation above,
528 g CO₂ were produced from 172 g of C₆H₁₄
Therefore,
562 g of CO₂ will react to produce = (562 × 172) / 528 = 183 g of C₆H₁₄
Thus, the mass of hexane, C₆H₁₄ needed is 183 g
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a point of reference is anything that seems steady that is used compare the position of an object
TRUE OR FALSE?
Answer:
True
Explanation:
hope it'll help!!
That statement would be true
Alleles are different forms of which genetic structure?
A. DNA
B. Cells.
C. Genes
D. Chromosomes
Answer:
answer is c
Allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
Which type of molecule is shown below?
O A. Alkyne
O B. Alkane
C. Alkene
O D. Aromatic
The type of molecule shown in the image has been an alkyne. Thus option A is correct.
The molecules formed by hydrogen and carbon are hydrocarbons, These are the organic compounds with the sharing of electrons in between the atoms.
The number of electrons shared results in the bond formed. The compound with only a single bond has been alkane. The presence of sharing of 2 atoms results in a double bond, and the compounds are alkene. The triple bond compounds are alkynes.
The given structure has the presence of a triple bond in the structure, thus the image has been of an alkyne. Thus, option A is correct.
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