Answer:
B
Explanation:
Bacteria reproduce by invading a host cell. *
Is it true or false
Answer:
i think its true but nevermind its true✌
Match the molecules to the correct state of matter
Answer:
1. solid, 2.liquid, 3.gas.
Answer:
1 b. solid
2 a. liquid
3 c. gas
What is the mole ratio of oxygen to butane?
Answer:
13:2
With the number of moles of butane equal to 54 grams, it is possible to find the moles of O2 that can react with it. Taking coefficients from the reaction equation (13 O2 and 2 C4H10), the molar ratio of O2 to C4H10 is 13:2.
Explanation:
which of the following elements has the smallest atomic radius?
Answer:
helium is the smallest element and francium is the largest
Answer:
K+ is the right answer
Explanation:
which chemical equation is balanced
A: 2K+ H20. K20 + H2
B: MgO + 2HCI. MgCI2. + 2H2O
C: CO2 + H20. H2CO2
D: CaO2 +HCI. CaCI2 +H2O
Explanation:
right answer is A
2K + H20 → K20 + H2
During electrolysis, where do reduction reactions occur?
Answer:
at the negative cathode
Explanation:
Reduction happens at the negative cathode because this is where positive ions gain electrons. Oxidation happens at the positive anode because this is where negative ions lose electrons.
Answer:
B. in the cathode of an electrolytic cell
Explanation:
Which type of bond stores the most energy
Answer:
I'm not sure which bond stores the most energy but the ionic bond is stronger than the covalent bond.
Explanation:
How many g of a 5.0% by weight NaCl solution are needed to give 3.2 g NaCl?
Answer:
1.12
Explanation:
HELPP ANSWERSSS!!!!
A student designs an investigation to test the reactivity of two elements with HCl to produce hydrogen gas. Using the periodic table as a model which of the following would you expect to produce the most hydrogen gas within the first minute of the reaction?
A.
Al, because it has the higher ionization energy and more readily accepts electrons to participate in a reaction.
B.
Al, because it has the lower ionization energy and more readily gives up valence electrons to participate in a reaction.
C.
Cs, because it has the lower ionization energy and more easily gives up its valence electrons to participate in a reaction.
D.
Cs, because it has the higher ionization energy and more easily gives up its valence electrons to participate in a reaction.
Answer:
C. Cs, because it has the lower ionization energy and more easily gives up its valence electrons to participate in a reaction.
Explanation:
The Cs will produce the most hydrogen gas because it has a lower ionization energy and more easily gives up its valence electrons to participate in the reaction.
Ionization energy is the energy required to remove the most loosely held electrons in an atom. Atoms with lower ionization energy readily goes into reactions. This is because they will present little barrier for the reaction to occur.An atom of an element can be identified from its
A. atomic mass
B. number of neutrons
C. Total change
D. Number of protons
Answer:
D. number of protons
Explanation:
Sana makatulong
draw a well-labelled diagram showing how your body digests food
i too used it
i thought it will help
nice time. .....
Explanation:
...................
DONT SKIPP What type of bond will occur between lithium and bromine?
A.
these atoms will not bond
B.
metallic
C.
ionic
D.
covalent
of rational function
1
3. + 3 < 0
3x-1
nctions.
Answer:
I didn't understand questions properly. Sorry
which statement correctly describes the relationship between chlorine and argon?
Answer:
Argon has a larger atomic number and a larger atomic mass.
In an enviroment in which the pH is 7, a carboxylic acid will exist as:
A) a negatively charged species
B)a positvely charged species
C)a neutral species
D)none of the other answers are correct
Answer:
The correct answer is C.
Explanation
The pH scale ranges from 0-14 so 7 is neutral.
what are bonds in which valence electrons are shared
Answer:true
Explanation:
Covalent bonds are a class of chemical bonds where valence electrons are shared between two atoms, typically two nonmetals. The formation of a covalent bond allows the nonmetals to obey the octet rule and thus become more stable.
Answer:
covalent bonds are bonds in which valence electrons are shared.
Explanation:
What will the pressure of the gas be if the temperature rises to 87°C?
A. 60 kPa
B. 161 kPa
C. 16 kPa
D. 41 kPa
Answer:
A. 60 kPa
Explanation:
P2 = p1 times t2 / t1
Explain the difference in reactivity between CH3+OH2 and CH3OH in a nucleophilic substitution reaction.
Here ya go, hope this helps! :)
how many grams of oxygen would we need to consume to produce 13.9 grams of MgO
Answer:
5.56g
Explanation:
Expression of the equation:
2Mg + O₂ → 2MgO
Mass of MgO = 13.9g
Solution:
2Mg + O₂ → 2MgO
To solve this problem, let us find the number of moles of MgO from the given mas;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
molar mass of MgO = 24 + 16 = 40g/mol
Number of moles = [tex]\frac{13.9}{40}[/tex] = 0.35mole
Now,
2 moles of MgO is produced from 1 mole of oxygen gas
0.35 mole of MgO will be produced from [tex]\frac{0.35}{2}[/tex] mole of oxygen gas
= 0.17mole of oxygen gas
So;
Mass of oxygen gas = number of moles x molar mass
Molar mass of O₂ = 2(16) = 32g/mol
Mass of oxygen gas = 0.17 x 32 = 5.56g
What are the products in a chemical reaction?
A. The substances that result from a chemical reaction
B. The substances that do not take part in a reaction
c. The substances that cause the reaction to occur
thing
D. The substances that react in a chemical reaction
Answer:
A
Explanation:
The product is the result of the chemical reaction hope that helped
Given the composition of your food, which of the following is good for your health? WHICH OF THEM IS BAD?
Answer:Eating the right foods can help your body cope more successfully with an ongoing illness. ... corn syrup) are also bad for long-term health, especially in people with diabetes. ... Also, you may have nutritional deficiencies due to certain health or life conditions, such ... Eating a balanced diet can help prevent these conditions.
Explanation:
At higher temperatures, air can hold __vapor as compared to air at lower?
Answer:
water vapor
Explanation:
the the answer is water vapor
What is the pH of an aqueous solution made by combining 35.01 mL of a 0.3791 M ammonium chloride with 40.07 mL of a 0.3542 M solution of ammonia to which 3.112 mL of a 0.0896 M solution of HCI was added?
Answer:
pH = 9.25
Explanation:
Using H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is pH of the buffer
pKa is pKa of the weak acid: 9.24
[A⁻] could be taken as moles of the conjugate base: Moles NH₃
[HA] moles of the weak acid: NH₄⁺
Initial moles of NH₃:
40.07mL = 0.04007L * (0.3542mol / L) = 0.01419mol
Initial moles NH₄⁺:
0.03501L * (0.3791mol / L) = 0.01327 mol
The HCl added reacts with NH₃ producing NH₄⁺:
HCl + NH₃ → NH₄⁺ + Cl⁻
Moles of HCl:
3.112x10⁻³L * (0.0896mol / L) = 0.00028 moles
That means moles of NH₃ and NH₄⁺ after the addition of HCl are:
NH₄⁺: 0.01327moles + 0.00028moles = 0.01355 moles
NH₃: 0.01419mol - 0.00028 moles = 0.01391 moles
pH of the buffer is:
pH = pKa + log [A⁻] / [HA]
pH = 9.24 + log [0.01391 moles] / [0.01355 moles]
pH = 9.25difference between elimination and substitution
Answer:
The obvious difference between substitution and elimination reactions is that substitution reactions replace one substituent with another while elimination reactions simply remove the substituent. ... The major difference between the groups is the number of steps the reaction takes place over.
substitution and elimination can be seenis by looking at the bond or the H+ . When substitution occurs, the H+ will be subtituted with other atom. As for elimination, when this reaction occur which mostly involve alkane, new bondwill appear.
Thank you and please rate me as brainliest as it will help me to level up
Calculate the mass (in kg) of 4.87 x 10 25 atoms of Zn
Answer:
5.29kg
Explanation:
5.29kg
The mass of 4.87×10²⁵ atoms of Zn is 5.29 Kg
From Avogadro's hypothesis,
6.02×10²³ atoms = 1 mole of ZnRecall,
1 mole of Zn = 65.38 g
Converting 65.38 g to Kilogram (Kg), we have:
1000 g = 1 Kg
Therefore,
65.38 g = 65.38 / 1000
65.38 g = 0.06538 KgThus, we can say that,
6.02×10²³ atoms = 0.06538 Kg of ZnFinally, we shall determine the mass of Zn that contains 4.87×10²⁵ atoms. This can be obtained as follow:
6.02×10²³ atoms = 0.06538 Kg of Zn
4.87×10²⁵ atoms = [tex]\frac{4.87*10^{25} * 0.06538}{6.02*10^{23} } \\\\[/tex]
4.87×10²⁵ atoms = 5.29 Kg of ZnTherefore, the mass of 4.87×10²⁵ atoms of Zn is 5.29 Kg
Learn more: https://brainly.com/question/5809151
Elements on the current periodic table are organized by what?
atomic number
number of neutron
reactivity
What do the flames below the pot
represent
Answer:
That it is cooking the food or whatever you have in the pot.
Explanation:
We are learning this in science.
Suppose that the microwave radiation has a wavelength of 12.4 cm . How many photons are required to heat 255 mL of coffee from 25.0 ∘C to 62.0 ∘C
Answer:
Explanation:
wavelength λ = 12.4 x 10⁻² m .
energy of one photon = h c / λ
= 6.6 x 10⁻³⁴ x 3 x 10⁸ / 12.4 x 10⁻²
= 1.6 x 10⁻²⁴ J .
Let density of coffee be equal to density of water .
mass of coffee = 255 x 1 = 255 g
heat required to heat up coffee = mass x specific heat x rise in temp
= 255 x 4.18 x ( 62-25 )
= 39438.3 J .
No of photons required = heat energy required / energy of one photon
= 39438.3 / 1.6 x 10⁻²⁴
= 24649 x 10²⁴
= 24.65 x 10²⁷ .
how is the atmosphere characterized
The maximum allowable concentration
of lead in drinking water is 9.0 ppb. If 2.0
X 10 grams of lead is present in 250
mL of water, is it safe to drink the water?
Support your answer with mathematical
proof.
We are given:
Maximum concentration of Lead in water = 9 ppb
Mass of Lead in the given solution = 20 grams
Volume of water in the given solution = 250 mL
What is 1 ppb?
1 ppb, short for parts-per-billion. As from its name itself, ppb is used to find how many molecules of solute are present per 1 Billion molecules of the solvent
you can also use it in grams to get the formula:
1 ppb = 1 gram of solute / 1 Billion grams of Solvent
Finding the Ideal ppb concentration:
We are given that the maximum allowed concentration is 9 ppb
which means that we need 9 grams of the solute per 1 Billion grams of Solvent: 9 grams of Solute / 10⁹ grams of Solvent
ppb Concentration of the given solution:
We have 20 grams of Solute in 250 mL of water
Since the density of water is 1 gram/mL
20 grams of Solute / 250 grams of Solvent
As we can see, this fraction is FAR more large that the maximum ppb concentration
This means that the concentration of Lead in the Given solution is higher than the maximum amount and Hence, is unfit to drink