Answer:
The volume of the gas decreases.Explanation:
Gold ions, Au*(aq), can easily be made to precipitate out of a solution as gold metal. Simply
bring another metal into the solution, and this metal becomes the reducing agent in the
chemical change. Write the half-reaction to represent the change in gold as it precipitates out
of the solution.
Don’t need answer unless you want to solve:) I just need help with understanding the explanation
Explanation:
gold is found very low down in the reactivity series thus is relatively unreactive. Metals found above gold in the series are more reactive compared to gold and thus is able to undergo a single displacement reaction, replacing gold in solution, which is then precipitated as a solid.
In a covalent bond between Cl and H, ( ) tends to attract electron density from the other element in the bond.
Answer:
Cl
Explanation:
In a covalent bond between Cl and H, (Cl) tends to attract electron density from the other element in the bond.
Chlorine is more electronegative than hydrogen. In general, elements towards the top-right of the periodic table are more electronegative. This is because these elements are desperate for a few more electrons to fill their outermost shell (and have a full octet). The more electronegative an element is, the more it wants electrons. As a result, highly electronegative atoms have a greater pull on the electrons in a covalent bond.
The periodic table is important"
Give three(3) reasons to support this statement?
Periodic table is important because it provides information, make easier to study and know about relationship between elements.
Why periodic table is important?The periodic table is very important because it provides a huge amount of information about elements and their relationship to one another. The table can be used to know about the properties of elements.
So we can conclude that periodic table is important because it provides information, make easier to study and know about relationship between elements.
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how was oil made and who created it
Answer:
About 300 million years ago,
Explanation:
Col. Edwin Drake
Answer:
Oil was formed from the animals and plants that lived millions of years ago and the creator is John D Rockefeller and others in 1870
The intermolecular forces that exist between the molecules of H₂O is...
Answer: hydrogen bonding
Explanation:
When hydrogen atoms bond with oxygen atoms, there is hydrogen bonding.
How many moles is 8.7 x 1027 atoms of Helium?
Answer:
14500.
Explanation:
1) Avlgadro's number is 6.022*10²³;
2) 1 mol is 6.022*10²³ atoms of Hellium, then 8.7*10²⁷ atoms is
[tex]3) \ \frac{87*10^{26}}{6*10^{23}}=14.5*10^3=14500[moles].[/tex]
Please answer ASAP on a timed exam
How much heat is required to convert 90. g of ice at -4.0 C to water vapor (steam) at 110 C
Answer: How much heat is required to convert 29 g of ice at -4.0 ˚C to water vapor at 105 ˚C (report your answer to three significant figures)? Answer all five parts, showing your detailed calculations: i) Heat to warm ice from -4.0 to 0 oC: ii) Heat to convert ice to liquid: iii) Heat to warm liquid to boiling: iv) Heat to convert liquid to gas
Explanation:
e
QUESTION 10
_________________________________ is the major regulatory enzyme in glycolysis that catalyzes the irreversible phosphoryl transfer from ATP to fructose 6-phosphate.
A.
Enolase
B.
Phosphofructokinase-1
C.
3-phosphoglycerate kinase
D.
Aldolase
Answer:
B
Explanation:
Phosphofructokinase-1
Does the NaOH test for calcium ions work when NaOH is added to limewater?
Answer:
Calcium hydroxide is a white precipitate, too, and it won't dissolve if more sodium hydroxide is added to the solution. No significant precipitate will be formed between calcium ions and ammonia.
Can someone help me with my homework, and show step by step so I can learn?
Answer:
Not sure.
Explanation:
Give me some time.
A casein isolation experiment yields 0.2g from 10g of milk What is the percentage of casein in the milk?
Answer:
2%
Explanation:
.2 g / 10 g * 100% = 2%
If a solution has 17.2 moles of LiF in 2000 mL of water, what is the molarity?
4.2 M
10 M
2 M
8.6 M
Molarity, M = (n x 1000) / vol (in ml)
M = 17.2 x 1000/ 2000
M = 8.6 mol/L
The whistle of a teakettle has a greater frequency than a drumbeat. True or false and why
Answer:
how was enacting the GI bill Like teaching someone how to fish
in the following reaction 10.5 moles of chromium are added to 6.8 moles of oxygen find limiting an excess reactants and answer the questions that follow.
Answer:
If 3.4 moles of carbon dioxide (CO2) form at the end of the reaction, 1.7 moles of oxygen gas
(02) and 3.4 moles of carbon monoxide (CO) entered the reaction
Explanation:
The rule of three or is a way of solving problems of proportionality between three known
values and an unknown value, establishing a relationship of proportionality between all of
them. That is, what is intended with it is to find the fourth term of a proportion knowing the
other three. Remember that proportionality is a constant relationship or ratio between different
magnitudes.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so
does the other (or when one magnitude decreases, so does the other), the direct rule of three
must be applied. To solve a direct rule of three, the following formula must be followed:
ab
cx
So
C*b
T =
a
In this case, it is possible to use the reaction stoichiometry of the reaction (that is, the
relationship between the amount of reagents and products in a chemical reaction) and the rule
of three to calculate the quantities of moles requested:
.
,
If by stoichiometry 2 moles of CO2 are formed by 1 mol of O2, if 3.4 moles of CO2 are
formed, how many moles of O2 are needed?
molesofo2 = 3.42
=
moles of O2=1.7 moles
• If by stoichiometry 2 moles of CO2 are formed by 2 moles of CO, if 3.4 moles of CO2 are
formed, how many moles of CO are needed?
molesof CO =
=
3.4*2
2
moles of CO=3.4
URGENT!!!
pH of a solution that has a [H3O+] = 6.25 x 10-5 M
The required pH of the solution is 4.2 which means solution is acidic in nature.
How do we calculate the pH?pH of the solution is define as the negative logarithm of the concentration of the hydronium ion, and it is represented as:
pH = -log[H⁺]
Given concentration of H₃O⁺ ion = 6.25×10⁻⁵ M
On putting this value on above equation, we get
pH = -log(6.25×10⁻⁵) = 4.2
Hence required pH of the solution is 4.2.
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A student is investigating how a bowl of ice changes in one hour. She places a bowl of ice on a table inside her classroom. She observes it at three different times. The diagram shows her observations.
The diagram shows a bowl with ice at 1:00 P M, 1:30 P M, and 2:00 P M. At 1:00 P M, the bowl is filled with ice cubes. At 1:30 P M, some ice cubes remain and they are floating in some water. At 2:00 P M, the bowl is filled only with water.
Question
Which question is the student ,begin emphasis,most,end emphasis, likely trying to answer?
Answer options with 4 options
A.
How does water evaporate?
B.
How can the water cycle be modeled?
C.
How is water chemically changed by melting?
D.
How does temperature affect the physical state of water?
The student, begins emphasis, most, ends emphasis, likely trying to answer How does temperature affect the physical state of water.
What is a physical change?A usually reversible change in the physical properties of a substance, like size or shape: Freezing a liquid is a physical change.
The temperature has a direct effect on whether a substance exists as a solid, liquid or gas. Generally, increasing the temperature turns solids into liquids and liquids into gases; reducing it turns gases into liquids and liquids into solids.
Hence, option D is correct.
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what property of water molecules is responsible for its high surface tension
Answer:
Hydrogen bonding
Explanation:
Nitrogen gas (N2) will bond with hydrogen gas (H2) to form ammonia (NH3), a common compound in living organisms. This reaction involves two reactants forming a single product. What type of reaction is this?
*
2 points
a) combination
b) single replacement
c) decomposition
d) neutralization
Answer:
c could someone try to do the page for me please i will really appreciate it I'll mark brainliest i need it by the end of my geometry class
Answer: The correct answer is (a)combination.
Explanation: Direct combination and synthesis are the same process in which two reactants form to make a product
Question 12 of 32
Which element has 5 valence electrons?
The Periodic Table
O A. Magnesium (Mg)
O B. Rubidium (RD)
O C. Arsenic (As)
O D. Boron (B)
Answer: Arsenic
Explanation:
Arsenic is in column 15 of the periodic table, which means that it has 5 valence electrons.
Convert 27 calories into kcal.
27
[tex]27 ~\text{cal} = \dfrac{27}{1000} ~ \text{kcal} = 0.027~ \text{kcal.}[/tex]
The Keq for the decomposition of hydrogen iodide to form hydrogen and iodine as follows
2HI(g)
↔
H2(g) + I2(g)
is 1.6 x 10–4. If the concentration at equilibrium of H2 and I2 are each 2 x 10–3 M, what is [HI]?
The equilibrium constant (Keq) is given for the reversible reactions. The concentration of hydrogen iodide will be 1.58 M.
What is Keq?The equilibrium constant (Keq) is the proportion of the ratios of the concentration of the products to the reactants.
The balanced chemical reaction is shown as:
2HI ⇔ H₂ + I₂
The equilibrium expression for the reaction can be given as:
Keq = [H₂] [I₂] / [HI]²
Given,
Equilibrium constant = 1.6 × 10⁻⁴
Concentration of dihydrogen = 2 × 10⁻³ M
Concentration of iodine = 2 × 10⁻³ M
The concentration of hydrogen iodide is calculated as:
1.6 × 10⁻⁴ = [ 2 × 10⁻³ M][2 × 10⁻³ M] ÷ [HI]²
[HI]² = 4 × 10⁻⁶ ÷ 1.6 × 10⁻⁴
= 2.5 M
[HI] = 1.58 M
Therefore, 1.58 M is the concentration of hydrogen iodide.
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In the reaction 2 Na(s) + Br2 ---> 2 NaBr(s). the (s) stands for
Answer:
The s stands for the phase of that element or compound. The phase solid is represented by (s). In this problem it is saying solid sodium (Na) is reacting with Bromine (Br) gas to form sodium bromide.
Explanation:
The hypothesis stated that the fraction of nuclei still radioactive after n half-life cycles should be 0.5n. How well does the regression equation support the hypothesis?
The regression equation supports the hypothesis by showing associations between sets of scientific data (in this case, half life cycle and radioactivity).
What is the regression equation?The regression equation is a type of mathematical tool employed to determine the association between variables.
The regression equation can help to understand the relationships between independent and dependent variables.
In conclusion, the regression equation supports the hypothesis by showing associations between sets of scientific data.
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Answer:
Quite Strongly
Explanation:
Got it right 2022 edge
Commercial agriculture can often lead to water-quality problems. In one to two sentences, explain how two of those problems occur.(2 points)
Commercial agriculture can often lead to water-quality problems in the following ways:
The washing of fertilizers and pesticides into water bodies from farms.What is water quality?Water quality refers to the state of a water body that encompasses it's physical, chemical and biological characteristics.
The water quality of a water body is crucial to its suitability for domestic or drinking purpose.
Commercial agriculture greatly affects water quality in the following ways:
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which pair of elements would form metallic bonds in a compound
Answer: Chlorine & Bromine
Explanation:
The substance that dissolves the solute
A) Solubility
B) Solvent
C) Solute
Answer:
B) Solvent
Explanation:
The substance being dissolved is called the solute and the liquid doing the dissolving is called the solvent. In order for a substance to dissolve, the molecules of the solute need to interact with the molecules of the solvent.
***After 42 days, 2 g of phosphorus-32 has decayed to 0.25 g. What is the half-life of phosphorus-322
The answer is the half life of phosphorus-32 is of 14 days .
What is Half Life ?
The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay.
The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.
Mass of atoms initially,
N₀ =2.0 g
Mass after 42 days,
N =0.25 g
mass left undecayed we have,
[tex]\rm\dfrac{N}{N_{0}} = \dfrac{1}{2^{n}}[/tex]
where n is number of half lives occured (the number of times it disintegrated into half of original)
[tex]\rm\dfrac{0.25}{2} = \dfrac{1}{2^{n}}[/tex]
[tex]\rm\dfrac{1}{8} = \dfrac{1}{2^{n}}[/tex]
[tex]\rm\dfrac{1}{2^{3}} = \dfrac{1}{2^{n}}[/tex]
n= 3
number of half lives occured in 42 days is 3
if half life is [tex]\rm t_{\frac{1}{2} }[/tex]
then
3* ( [tex]\rm t_{\frac{1}{2} }[/tex] ) = 42
[tex]\rm t_{\frac{1}{2} }[/tex] = 14 days
Therfore the half life of phosphorus-32 is of 14 days .
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How many moles of water would be used reacting with 500g of P4010? *
P20,0 + H2O → H, PO,
PO
4
4 10
Answer:
410
Explanation:
:)))))))))))))))))))))))))))))))
a scientist prepares a solution by dissolving 25.22g of lithium fluoride (lif) in 2.2 liters of water. What would be the molarity of the solution?
Answer:
[tex]c = 0.441mol{dm}^{ - 1} [/tex]
Explanation:
[tex]m = 25.22g \\ v = 2.2l = 2.2 {cm}^{3} \\ mm(lif ) = 7 + 19 \\ = 26g {mol}^{ - 1} \\ number \: of \: moles(n) = \frac{m}{mm} \\ = \frac{25.22g}{26g {mol}^{ - 1} } \\ = 0.97mol \\ concetration(c) = \frac{n}{v} \\ = \frac{0.97mol}{2.2 {cm}^{3} } \\ c = 0.441mol {dm}^{ - 3} [/tex]
