Answer:
Never attempt to balance a reaction by changing the subscripts on a molecule. ... Therefore, the reaction is balanced. The law of conservation of mass applies in all chemical equations. This means that the number of atoms of products present is conserved in the number of atoms of reactants.
Photosynthesis cannot happen without:
O light
O chlorophyll
O carbon dioxide
O all of the above
O none of the above
All of the above — plants need light, chlorophyll, and carbon dioxide to perform photosynthesis, a chemical reaction producing glucose (which provides energy for the plant.)
when ammonium nitrate is found at a fire scene, it may undergo thermal decomposition producing which materials?
Answer:
nitrous oxide
Explanation:
Who discovered neutron particles?
Which of the following statements best explains why the atomic radius increases from top to bottom of the periodic table? A. The electronegativity decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. B. For the atoms lower in the periodic table, there is more difference in charge between the electrons and the protons, which allows electrons to orbit farther from nucleus. C. The ionization energy decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.
Answer:
D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.
Explanation:
Atomic radius increases down the group because down the group, there an increase in the number of principle energy levels occupied. Now, these higher principal energy levels are made up of orbitals that are larger than the orbitals from the lower energy levels in size.
Therefore, the effect of this is that the greater number of principal energy levels will outweigh the increase in nuclear charge since nuclear charge also increases down the group and this in turn makes the atomic radius to increase as we go down the group.
Answer: C. For the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus.
Explanation: As the valance electrons orbit farther from the nucleus the energy level increases from the top to the bottom of the periodic table. So the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus, which result in an increase in the atomic radius.
H2
Express the mass to three significant figures.
Answer:
1.01 amu
Explanation:
Published atomic mass = 1.00797amu => 1.01 amu (3 sig-figs)
Foods used by animal cells include starches, sugars, and:
O fats
O oxygen
O carbon dioxide
Answer:
i think it is fats might be wrong sorry
Answer:
Foods used by animal cells include starches, sugars, and:
A. carbon dioxide
B. oxygen
C. fats
Explanation:
C.. FATS
HELP I HAVE NO TIME LEFT
Answer:
Top question is B
Bottom question is A
Explanation:
Answer:
top answer : B. intrusive igneous rock
bottom answer : A. extrusive igneous rock
Hope this helps!
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Which equation represents a redox reaction?
A. HCI + LiOH
-
LiCl + H20
B. AgNO3 + LICI
AgCl + LINO3
C. HNO3 + KOH - KCl + H20
D. 2NaBr + Cl2
-
2NaCl + Br2
SUBI
Answer:
D. [tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]
Explanation:
Hello!
In this case, for the given set of chemical reactions, it is possible to infer that D. is a categorized as redox due to the following:
Since both chlorine and bromine remain as diatomic gases, their oxidation states in such a form is 0, but as anions with lithium cations they have a charge of - according to the following reaction and half-reactions:
[tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]
[tex]Cl_2^0+2e^-\rightarrow 2Cl ^-\\\\2Br^- \rightarrow Br_2^0+2e^-[/tex]
Unlike the other reactions whereas no change in the oxidation states is evidenced.
Answer:
D. 2NaBr + Cl2
does Al3+ gain or loose electrons?
Answer:
gain
Explanation:
commercial uses of calcium oxide
Answer:
calcium oxide, chemical compound, CaO, a colorless, cubic crystalline or white amorphous substance. It is also called lime, quicklime, or caustic lime, but commercial lime often contains impurities, e.g., silica, iron, alumina, and magnesia. It is prepared by heating calcium carbonate (e.g., limestone) in a special lime kiln to about 500C to 600C, decomposing it into the oxide and carbon dioxide. Calcium oxide is widely used in industry, e.g., in making porcelain and glass; in purifying sugar; in preparing bleaching powder, calcium carbide, and calcium cyanamide; in water softeners; and in mortars
MOLECULES SPEED UP WHEN ENERGY IS CREATED AND SLOW DOWN WHEN ENERGY IS DESTROYED true or false
how are atoms an example of unity?
A. All atoms have the same arrangement of electrons.
B. All atoms react with other atoms the same way.
C. All atoms of one kind share common properties.
D. All atoms have the same number of neutrons.
Answer: C. All atoms of one kind share common properties.
Explanation:
What solid element is black, is an electrical conductor, is brittle and is found in group 4 of the periodic table?
Answer: silicon Si, Germanium GE
Explanation:
The ocean does NOT influencepur weather.
true or false
Answer:
True
Explanation:
Calculate the mass of chromium produced from 5 kg of Cr2O3.
Answer:
3421.34 g
Explanation:
2Cr2O3 → 4Cr + 3O2
From the equation abve;
2 mol of Cr2O3 produces 4 mol of Cr
Converting 5 kg of Cr2O3 to mol;
Number of moles = Mass / Molar mass = 5000 / 151.99 g/mol = 32.9 mol
2 mol = 4 mol
32.9 mol = x
Solving for x;
x = 32.9 * 4 / 2
x = 65.8 mol
Mass = Number of moles * Molar mass
Mass = 65.8 * 51.9961
Mass = 3421.34 g
A chemist needs to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. He has a 0.1071 M standard sodium hydroxide solution. He takes a 25.00 mL sample of the original acid solution and dilutes it to 250.0 mL. Then, he takes a 10.00 mL sample of the dilute acid solution and titrates it with the standard solution. The endpoint was reached after the addition of 12.69 mL of the standard solution. What is the concentration of the original sulfuric acid solution?
Answer:
The way the chemist works is through the chemistry of astronomical events in the atmosphere of delocalisation which causes a significant impact on Kanye West which ellaborates the terrific police of the UK. And thats why me and Jennifer Lopez share the same hair band.
Which type of material incorporates a variety of substances to enhance desired properties such as strength and flexibility?
Answer:
its a polymer
Explanation:
How many grams of Ca(I03)2, is produced if the yield is 100%?
Answer:
See the attached for the answer
Explanation:
how many moles of Ag are in 43.1 grams of Ag2O
Answer:
0.372 mol (corr. to 3 sig. fig.)
Explanation:
no. of mole of Ag₂O
= mass of Ag₂O ÷ relative atomic mass of Ag₂O
= 43.1 ÷ ( 107.9 × 2 + 16 )
≈ 0.185936151 mol
∵ Ratio of Ag:Ag₂O = 2:1
∴ no. of mole of Ag
= no. of mole of Ag₂O × 2
≈ 0.371872303 mol
= 0.372 mol (corr. to 3 sig. fig.)
Which describes how atoms form molecules.An atom is to a molecule as
A. A letter is to a word
B. A cat is to a mouse
C. A spoon is to the soup
D. A book is to a page
A balloon is floating around outside your window. The temperature outside is -1 °C, and the air pressure is 0.800 atm. Your neighbor, who released the
balloon, tells you that he filled it with 5.00 moles of gas. What is the volume of gas inside this balloon?
Express your answer to three significant figures and include the appropriate units.
View Available Hint(s)
HA
?
Vballoon
Value
Units
Submit
Part B
A 14.0 L gas cylinder is filled with 5.00 moles of gas. The tank is stored at 7 °C. What is the pressure in the tank?
Express your answer to three significant figures and include the appropriate units.
View Available Hint(s)
Answer:
140 L (3 sig-figs; includes the zero)*
Explanation:
PV = nRT => V = nRT/P
P = 0.800atm
V = ?
n = 5 moles
R =0.08206 L·atm/mol·K
T = -1°C = (-1 + 273)K = 272K
V = nRT/P = (5mol)(0.08206 L·atm/mol·K)(272K)/(0.800atm) = 139.5 L
*=> 140 Liters (3 sig-figs) => zero is a sig-fig b/c it was result of rounding 139.5 Liters to obtain 140 Liters.
what is the bromothymol blue of lemon?
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Litmus paper and pH indications.
Since the Litmus paper and Artificial indicators are used to check the pH of any solution.
=> If a substance is Acidic, its pH range is less than 7 , and the colour are generally red, yellow, orange and hot shades.
=> If a substance is Basic, it's pH range is more than 7 , and the colors are generally Cool shades like, blue, violet, green, etc.
==> In the lemon juice experiment, the pH paper turns from blue to vivid red, indicating the presence of H3O+ ions: lemon juice is acidic. Refer to the table of Universal Indicator Color change for clarification.
A hypothetical element consists of two isotopes of masses 86.95amu and 88.95amu with abundances of 35.5% and 64.5% respectively. What iis the average atomic mass of this element
Answer: The average atomic mass of the element = 88.242amu
Explanation:
The abundance of the first isotope is =35.5%
Atomic mass of first isotope = 68.9257
The average atomic mass of the first isotope =86.95amu X 35.5% =86.95amu X 0.355 =30.8725 amu
The abundance of the second isotope =64.5%
Atomic mass of the second isotope =88.95amu
The average atomic mass of second isotope =88.95amu x 64.5% = 88.95amu x 0.645= 57.37275 amu
Now the average atomic mass =30.8725 +57.37275 = 88.242amu
OR using the formulae
Average atomic mass = [mass of isotope× its abundance] + [mass of isotope× its abundance] +...[ ] / 100
{(86.95amu X 35.5 )+(88.95amu x 64.5)}/100
8,824/100
=88.24amu
H2SO4(aq)+Sr(OH)2(aq)→
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
H2SO4(aq) + Sr(OH)2 (aq) --> SrSO4(s) + 2H2O (l)
Explanation:
The identification of all the phases with the help of a chemical equation is as follows:
[tex]H_2SO_4(aq) + Sr(OH)_2 (aq)[/tex] → [tex]SrS0_4 (s) + 2H_2O (l).[/tex]What is a Chemical equation?The chemical equation may be defined as the systematic demonstration of chemical reactions through which the reactants and the products are indicated in terms of their specific chemical formulae.
According to this question, the reaction of sulfuric acid with strontium hydroxide indicates an example of a double decomposition reaction in which the SO4 of sulfuric acid combines with strontium in order to form strontium sulfate while the hydroxide of strontium combines with H2 of sulfuric acid in order to form water.
Therefore, the identification of all the phases with the help of a chemical equation is well expressed with the help of a chemical equation.
To learn more about Chemical equations, refer to the link:
https://brainly.com/question/26694427
#SPJ2
Predict how blockage of both fallopian tubes would affect a woman’s ability to reproduce naturally. Explain your answer.
NEED HELP ASAP FREE BRAINLIST
Answer:
7) C. Sodium
8) G. 1 valence electron
Explanation:
Determine whether each of the following salts will form a solution that is acidic, basic, or pH-neutral.
a. KCl
b. NaClO
c. Al(ClO4)3
d. NH4Cl
e. C5H5NHF
f. NaBr
g. Ca(NO2)2
Answer:
a) Neutral
b) Basic
c) Acidic
d) Acidic
e) Basic
f) Neutral
g)
Explanation:
a) KCl is a neutral salt because K ion in solution form produces both acid and base (KOH)
b) NaClO produces basic solution because ClO− is the conjugate base of a weak acid
c) Al(ClO4)3 will produce acidic solution because ClO4 is component of strong acid
d) NH4Cl will produce acidic solution because NH4+ ion is a strong conjugate acid of the weak base and Cl- is a weak conjugate base of the strong acid
e) Basic
f) Neutral salt
g) Acidic
12.0 grams of sodium reacts with 5.00 grams of chlorine. What mass of sodium chloride could be produced? Na(s) + Cl2(g) à NaCl(s) (1) Identify the limiting reactant. (2) Determine the amount of sodium chloride produced.
Answer:
1. Cl₂ is the limiting
2. 8.24 g of NaCl.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2Na + Cl₂ —> 2NaCl
Next, we shall determine the masses of Na and Cl₂ that reacted and the mass of NaCl produced from balanced equation. This is illustrated below:
Molar mass of Na = 23 g/mol
Mass of Na from the balanced equation = 2 × 23 = 46 g
Molar mass of Cl₂ = 2 × 35.5
= 71 g/mol
Mass of Cl₂ from the balanced equation = 1 × 71 = 71 g
Molar mass of NaCl = 23 + 35.5
= 58.5 g/mol
Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g
SUMMARY:
From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂ to produce 117 g of NaCl.
1. Determination of the limiting reactant.
From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂.
Therefore, 12 g of Na will react with = (12 × 71) / 46 = 18.52 g of Cl₂.
From the calculation made above, we can see clearly that a higher amount (i.e 18.52 g) of Cl₂ than what was given (i.e 5 g) is needed to react completely with 12 g of Na.
Therefore, Cl₂ is the limiting reactant and Na is the excess reactant.
2. Determination of the amount of NaCl produced from the reaction.
In this case the limiting reactant will be used because it will give the maximum yield of NaCl as all of it consumed in the reaction.
The limiting reactant is Cl₂ and the mass of NaCl produced can be obtained as follow:
From the balanced equation above,
71 g of Cl₂ reacted to produce 117 g of NaCl.
Therefore, 5 g of Cl₂ will react to produce = (5 × 117)/71 = 8.24 g of NaCl.
Thus, 8.24 g of NaCl were obtained from the reaction.
Calculate the morality of a 35.4% (by mass) aqueous solution of phosphoric acid (H3PO4). Molar mass of H3PO4 is 98.00g/mol
Answer:
no idea with the answer pls check with otherr
What is 17647.05882 rounded to 2 significant figures?