Answer:
Hypothesis is a statement of expectation or prediction that will be tested by research
Can someone help me pleaseee
Answer:
D.
Explanation:
Answer
0°C
Explanation:
substance be formed in it's solid state
True or False all non - metal elements are gassed at room temperature.
Answer:
false
Explanation:
you have bromine , its a non metal and liquid in room temperature
6. The fusion of 4 H-1 nuclei to produce two positrons and one other nuclei.
Explanation:
Normally, fusion involves two heavy hydrogen nuclides but since we have 4 light hydrogen nuclides, two of which underwent positron emission, thus changing two protons into neutrons plus 2 positrons and 2 neutrinos. The resulting nucleus from this fusion reaction is an He-4 nucleus.
The ionization energies required to remove successive electrons from one mole of calcium atoms are 590 kJ/mol, 1145 kJ/mol, 4912 kJ/mol, and 6474 kJ/mol. The most common ion of calcium is probably
Answer:
Ca^2+
Explanation:
As we know, more energy is required to remove an electron from a positively charged ion than is required to remove an electron from a neutral atom. Hence, the second ionization energy of calcium is greater than its first ionization energy.
However, the third and fourth ionization energies of calcium are much higher than the second ionization energy because they involve removal of electrons from an inner filed shell. This process requires a lot of energy and is often not feasible.
Hence, the most common ion of calcium must be Ca^2+ where only two electrons are removed from calcium.
The boat shown in the photo below is moving along at a constant 20 miles per hour. Is the boat accelerating? Question 3 options: A. No because it is not speeding up B. Yes because it is changing direction C. No because it is not slowing down D. Yes because the velocity is staying constant
Answer:
A
Explanation:
If its going at a constant speed it will not accelarate wich means to speed up.
Which statement best describes what makes a base weak? A base is weak when it forms few ions in water. A base is weak when only a little of it is dissolved in water. A base is weak when its concentration is high. A base is weak when it totally forms ions in water.
Answer:
A base is weak when only a little of it is dissolved in water
Explanation:
Answer: B.) A base is weak when only a little of it is dissolved in water
Hope this helps :)
What is the [OH-] in a solution that has a [H+] = 4.51 x 10^-6M?
Answer:
2.22×10⁻⁹ M
Explanation:
Applying,
[OH⁻][H⁺] = 1×10⁻¹⁴................... Equation 1
Where [OH⁻] = Hydroxyl ion concentration, [H⁺] = Hydrogen ion concentration.
make [OH⁻] the subject of the equation,
[OH⁻] = 1×10⁻¹⁴/[H⁺]............... Equation 2
From the question,
Given: [H⁺] = 4.51×10⁻⁶ M
Substitute into equation 2
[OH⁻] = 1×10⁻¹⁴/4.51×10⁻⁶
[OH⁻] = 2.22×10⁻⁹ M
A 2.0 L flask contains nitrogen and oxygen gases at 25°C. The total pressure is 0.91 atm and contains 0.050 mol of nitrogen. Calculate the partial pressure of oxygen and moles of oxygen present
Answer:
.025 ml 02
Explanation:
I made a pdf and pasted it in and etc
The carbon dioxide is released when limestone is heated during the
production of _____?
Carbon dioxide is released when limestone is heated during the production of [tex]\sf\purple{cement}[/tex]. ✔
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1.How many moles of each element are in 0.0250 mol of K 2 Cr O 4? 2. How many moles of ammonium ions are in 4.50 mol of (N H 4 ) 2 CO 3 ? With all the process to see where you get the answers please
Answer:
1. 0.0500 moles K, 0.0250 moles Cr and 0.1000 moles O.
2. 9.00 moles ammonium ions are present.
Explanation:
1. In 1mol of K2CrO4 there are 2 moles of K, 1 mole of Cr and 4 moles of O.
The moles in 0.0250 moles K2CrO4 are:
0.0250mol * 2 = 0.0500 moles K
0.0250mol * 1 = 0.0250 moles Cr
0.0250mol * 4 = 0.1000 moles O
2. In 1 mole of (NH4)2CO3 there are 2 moles of ammonium ions, NH₄⁺.
In 4,50 moles are:
4.50 moles * 2 = 9.00 moles ammonium ions are present
A student performed the following reaction in his Chemistry class: Zn + 2HCl ---> ZnCl2+H2. He started with 32.70 g of Zn metal and 18.23 g HCl and got 60.1 g of of ZnCl2.
(I) How much ZnC12 should he have produced?
(II) What was his percentage yield?
(III) If the 32.70 g of Zinc that he started with contained impurities (materials other than Zinc), will this support the student's percentage yield?
Explain briefly.
Answer:
(I) [tex] m_{ZnCl_{2}} = 34.07 g [/tex]
(II) [tex] \% y = 176.4 \% [/tex]
(III) The presence of impurities in the 32.70 g of zinc will support the student's percentage yield.
Explanation:
The reaction is:
Zn + 2HCl → ZnCl₂ + H₂
(I) To find the number of moles of ZnCl₂ we need to calculate the number of moles of the reactants.
[tex] n_{Zn} = \frac{m}{A} [/tex]
Where:
m: is the mass
A: is the standard atomic weight
[tex] n_{Zn} = \frac{32.70 g}{65.38 g/mol} = 0.50 moles [/tex]
[tex] n_{HCl} = \frac{18.23 g}{36.458 g/mol} = 0.50 moles [/tex]
If 1 mol of Zn reacts with 2 moles of HCl, the number of moles of Zn needed to react with 0.50 moles of HCl is:
[tex] n_{Zn} = \frac{1 mol Zn}{2 moles HCl}*0.50 moles HCl = 0.25 moles [/tex]
Then, the limiting reactant is HCl. Now, we can find the number of moles of ZnCl₂ by knowing that 2 moles of HCl produce 1 mol of ZnCl₂.
[tex] n_{ZnCl_{2}} = \frac{1 mol ZnCl_{2}}{2 moles HCl}*0.50 moles = 0.25 moles [/tex]
Finally, the mass of ZnCl₂ that he has produced is:
[tex] m_{ZnCl_{2}} = n_{ZnCl_{2}}*M = 0.25 moles*136.286 g/mol = 34.07 g [/tex]
(II) The percentage yield can be found with the following equation:
[tex] \% y = \frac{m_{e}}{m_{t}} \times 100 [/tex]
Where:
[tex] m_{e}[/tex]: is the experimental mass = 60.1 g
[tex] m_{t}[/tex]: is the theoretical mass = 34.07 g
Hence, the percentage yield is:
[tex] \% y = \frac{60.1 g}{34.07 g} \times 100 = 176.4 \% [/tex]
(III) The presence of impurities in zinc will explain why the percentage yield is greater than 100% because the mass of the impurities will make the mass of zinc bigger than its mass without impurities. If there were no impurities in the zinc, its mass would be smaller and thus the percent yield.
I hope it helps you!
define restivity and conductivity?
Answer:
Electrical resistivity is a property of a material that tells you how much it resists the flow of electric current, while conductivity quantifies how easily current flows.
Imagine you had HCl with a concentration of exactly 0.10 mol/dm3. If 0.023 dm3 of a sodium hydroxide solution, NaOH (aq), could exactly neutralize 0.040 dm3 of the HCl solution, what is the concentration of the NaOH (aq)
Answer:
Explanation:
Step 1: Calculate the amount of sodium hydroxide in moles
Volume of sodium hydroxide solution = 25.0 ÷ 1,000 = 0.0250 dm3
Rearrange:
Concentration in mol/dm3 =
Amount of solutein mol = concentration in mol/dm3 × volume in dm3
Amount of sodium hydroxide = 0.100 × 0.0250
= 0.00250 mol
Step 2: Find the amount of hydrochloric acid in moles
The balanced equation is: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
So the mole ratio NaOH:HCl is 1:1
Therefore 0.00250 mol of NaOH reacts with 0.00250 mol of HCl
Step 3: Calculate the concentration of hydrochloric acid in mol/dm3
Volume of hydrochloric acid = 20.00 ÷ 1000 = 0.0200 dm3
Concentration in mol/dm3 =
Concentration in mol/dm3 =
= 0.125 mol/dm3
Step 4: Calculate the concentration of hydrochloric acid in g/dm3
Relative formula mass of HCl = 1 + 35.5 = 36.5
Mass = relative formula mass × amount
Mass of HCl = 36.5 × 0.125
= 4.56 g
So concentration = 4.56 g/dm3
Explain how failing to conserve water can lead to an increase in water contamination.
Answer:
Failure to conserve water during irrigation can lead to an increase in pollution that results from runoff. Natural filters are diminished by the overuse of water resources, which leads to an increase in water contamination that would have been filtered by these natural sources.
Explanation:
Answer:
a. Overirrigating fields causes an increase in pollution that results from runoff.
b. Natural water filters are depleted by the overuse of water.
c. Sewage systems are more likely to fail due to greater demand, causing higher chances of water contamination.
The atmospheric pressure on Stevens pass was measure to be 589mmHg. What is the pressure in atm
Answer:
The pressure is equal to 0.775 atm.
Explanation:
Given that,
The atmospheric pressure on Stevens pass was measure to be 589mmHg.
We need to find the pressure in atm.
We know that,
1 standard atmosphere = 760 mm Hg
1 mm Hg = (1/760) standard atmosphere
589 mm Hg = (1/760)× 589 standard atmosphere
= 0.775 standard atmosphere
Hence, the pressure is equal to 0.775 atm.
what are the names given to each part of the picture indicated above
A glass jar is sealed, trapping air inside. The jar warms up after it is left ourside in the sun. What will happpen to the pressure inside the jar? Explain by talking about particle collisions.
Answer:
the particles start to spread out and cause it to get warmer
Explanation:
Science
How is the total magnification of a
cell calculated?
2CO +0, 200, what is the mole ratio of carbon monoxide to carbon
dioxide
A 1.2
B 2.2
C 2:1
D 3:1
Answer:
B. 2.2
Explanation:
What impacts do you think the Burmese pythons might have on local ecosystems?
Calculate the mass of an object that has a density of 3.52g/cm^3 and
a volume of 5000 cm^3. Note that Mass = Volume X Density
Answer:
17.6kg
Explanation:
mass = Volume × Density
mass = 5000cm^3 × 3.52g/cm^3
mass = 17600g = 17.6kg
The primary function of a chloroplast is to -
F . Convert food into energy a cell can use
G . Control the function of a cell and control genetic traits
H . Convert radiant energy into chemical energy through photosynthesis
J . Store water and nutrients
Please help!!!
45.6 grams of CH4 is placed into a 275 mL container at 55.00C. What is the pressure inside the container in atm?
Given-
Mass of CH4 - 45.6 grams
Molar mass of CH4 - 16.04 g/mol
volume - 275mL
Temperature- 55°C
Solution,
moles of methane (CH4) n = 45.6/16.04
= 2.84 moles
Using Formula,
Pv = nRT
P*275 = 2.84*8.314*55
P = 1298.64/275
P = 4.72 Atm.
Answer - The pressure inside the container in atm is 4.72.
45.6 grams of CH4 is placed into a 275 mL container at 55.00 C. The pressure is 4.72 atm.
What is partial pressure?The pressure that one of the gases in a mixture would exert if it were in the same volume on its own.
Given the mass is 45.6 grams
The volume is 275 L
Temperature is 55.00 C.
Calculate the moles
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{45.6}{16.04} = 2.84 moles[/tex]
Now, calculating the pressure
PV = nRT
[tex]P\times 275 = 2.84\times 8.314\times 55 = 4.72 atm.[/tex]
Thus, the pressure inside the container in is 4.72 atm.
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Los ácidos y el pH son muy importantes en la digestión de los alimentos. Pero ¿por qué se pone en riesgo la salud con lo que comes?
Answer:
Plssssssssd can you translate to English???
The volume of a gas decreases to half of its original volume, but the gas maintains the same number of moles and temperature. According to the ideal gas law, what will most likely happen to the pressure
Please hurry Which of the following statements is true?
• A positively charged atom has more electrons than protons.
• A positively charged atom has more protons than neutrons.
• A positively charged atom has more neutrons than protons.
• A positively charged atom has no electrons.
• A positively charged atom has more protons than electrons.
Answer:
E, answer 5, A positively charged atom has more protons than electrons.
Explanation:
which of the follwing is false ? A . the mass of proton is heavier than electron . B . protons and electron are found in nucleus C . Nucleus is very small but massive D . Neutrons are neutral particles
Answer:
C
Explanation:
The nucleus is very dense
List two differences between copper and
carbon.
Answer:
Copper is a good conductor but carbon isn't
Copper has 1 valence electrons but carbon has 4 valence electrons
Explanation:
The two differences between copper and carbon is that of electronic configuration due to which copper is a metal and carbon is a non-metal.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Learn more about electronic configuration,here:
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5.) If 6 moles of Oxygen Gas (O2) are produced in the reaction below, how
many grams of Potassium Chloride (KCI) are also produced? *
2 KCIO3 → 2 KCI + 3 O2
Answer:
im really sorry but i dont no☹
Can someone please help with these questions!! I would really appreciate it
Answer: water
Explanation: those elements all react to water , so the answer would be water . :)