Q=mcΔt
669440 = 2.10³ x 4.184 x (100-20)
669440 = 669440 √ (correct)
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.
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]
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
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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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:
:)))))))))))))))))))))))))))))))
which pair of elements would form metallic bonds in a compound
Answer: Chlorine & Bromine
Explanation:
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%
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
Part 1. A chemist reacted 15.0 liters of F2 gas with NaCl in the laboratory to form Cl2 and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1.50 atm.
F2 + 2NaCl → Cl2 + 2NaF
Part 2. Explain how you would determine the mass of sodium chloride that can react with the same volume of fluorine gas at STP.
From the calculation and the data provide, the mass of NaCl is about 115 g.
What is reaction?The term reaction refers to the combination of two or more substances to yield a product.
The equation of the reaction is; F2 + 2NaCl ----->Cl2 + 2NaF
Number of moles of F2 reacted is obtained from;
PV = nRT
n = PV/RT
n = 1.50 atm. * 15.0 l/0.082 atmLK-1mol-1 * 280
n = 22.5/22.9
n = 0.98 moles
If 1 mole of F2 reacts with 2 moles of NaCl
0.98 moles of F2 reacts with 0.98 moles * 2 moles/1 mole
= 1.96 moles
Mass of NaCl = 1.96 moles * 58.5 g/mol = 115 g
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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 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.
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.
A gas has a pressure of 853.0 millibars at a temperature of 29.0 °C. If the volume is unchanged but the temperature is increased to 85.0 °C,
what is the new pressure of the gas?
=
The new pressure of the gas that initially have a pressure of 853.0 millibars at a temperature of 29.0 °C is 1011.17 millibars. Details about pressure can be found below.
How to calculate pressure?The pressure of a given gas can be calculated using the following formula:
P1/T1 = P2/T2
Where;
P1 = initial pressure = 853.0 millibarsP2 = final pressure = ?T1 = initial temperature = 29°C + 273 = 302KT2 = final temperature = 85°C + 273 = 358K853/302 = P2/358
358 × 853 = 302P2
305374 = 302P2
P2 = 305374 ÷ 302
P2 = 1011.17 millibars
Therefore, the new pressure of the gas that initially have a pressure of 853.0 millibars at a temperature of 29.0 °C is 1011.17 millibars.
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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]
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
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
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.
4. CO2 +NH3 →OC(NH2)2 2 +H2O
How do you make this balanced
Answer:
I think what you are looking for is below
Explanation:
CO2 + 2 NH3 → (NH2)2CO + H2O
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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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
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.
What is the volume of 7.25 g of oxygen gas at STP? 79.03 L 5.08 L 55.0 L O 2L 86 L
98.382 L
This is tricky! But this is my awnswer! :) Hope it helps
Can someone help me with my homework, and show step by step so I can learn?
Answer:
Not sure.
Explanation:
Give me some time.
What is the speed of a sound wave that has a wavelength of 2 m and a frequency of 170.5 Hz?
Answer:
341m/s
Explanation:
because speed is given by the product of frequency and wavelength, so mathematically we can write ( v=f×lambda)... so in this case we can say speed=170.5×2= 341m/s
:.speed of the wave= 341m/s
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:
When studying the immune system in class, Peta concluded that T-cells are more specific to the pathogen than inflammation is.
What did Peta most likely learn that led to this conclusion?
T-cells are made to identify antibodies, while inflammation starts a fever.
T-cells are made to identify antigens, while inflammation starts to make antibodies.
T-cells make antibodies that cause a fever, while inflammation identifies antigens on the pathogens.
T-cells are made to identify antigens, while inflammation fights anything in the affected area.
Mark this and return
Answer:
T-cells are made to identify antigens, while inflammation fights anything in the affected area.
Explanation:
virus antigen on an infected cell fits into the Killer T-cell receptor
T-cell releases perforin and cytotoxins.
Perforin first makes a hole infected cell membrane
Cytotoxins go inside the cell through this hole, destroying it and any viruses inside
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what property of water molecules is responsible for its high surface tension
Answer:
Hydrogen bonding
Explanation:
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
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
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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