Answer:
Hello
The answer is 25gr H2O
Explanation:
50grH2×1 molH2/2 gr H2×2mol H2O/2molH2=25gr H2O
You are given a sample of a colourless liquid. Describe how you would show that it was pure water. FASTEST ANSWER GETS BRAINLIEST
Answer:
By measuring the liquids freezing point, you will be able to know if it's pure water. if the water freezes at 32 Fahrenheit, or 0 celcius, then you know the colourless liquid is water.
Explanation:
Answer: you could drink it
Explanation:
If 1.08 g of sodium sulfate reacts with an excess of phosphoric acid, how much sulfuric acid is produced? Show all work. PLEASE HELP ME
the si base units for length and time are
Answer:
The meter, symbol m, is the SI unit of length
The second, symbol s, is the SI unit of time.
m - metre
s- second
The SI base units for length is meter and time is second.
What is SI units?SI unit stands for international system of units.
It is defined as a metric system that is used as a measurement standard expected globally.
There are basically seven SI based quantities
Thus, the SI base units for length is meter and time is second.
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In a molecule of PCl3, 6 electrons will form
A) nonpolar covalent bonds
B) polar covalent bonds
C) ionic bonds
D) hydrogen bonds
Answer:
polar covalent bonds
Explanation:
Phosphorus trichloride is a chemical compound of phosphorus and chlorine, having the chemical formula PCl 3. It has a trigonal pyramidal shape, owing to the lone pairs of electrons on the phosphorus atom.
Chlorine is more elctronegative than phosphorus . Phosphorus has a lone pair of electrons and every chlorine atom has three pairs of electrons . The molecule is not symmetrical as the shared electron pairs are closer to the chlorine atoms than the phosphorus atoms , the chlorine atoms are shifted towards one side of the center of the molecule , thus a net dipole effect is created. This is the reason why the molecule is polar .
5.If 30mL of 0.5M NaOH(aq) was used to neutralize 10mL of HCl(aq), what is the concentration of the acid? Show work.
Answer:
0.15M
Explanation:
NaOH + HCl -->NaCl + H2O
moles of NaOH reacted with HCl
(0.5 × 30)/1000 = 1.5 × 10^ -3
so the moles of HCl reacted with NaOH
1.5 × 10^ -3
concentration of HCl = ( 1.5 × 10^ -3)/10 ×1000
Living organisms contain carbon compounds.
Answer:
Living organisms do contain carbon compounds. This is true.
Explanation:
Which statements describe Rutherford’s model of the atom? Select three options.
Answer:
Well, I cannot see the options but if I were you I would choose the one closest to this. Rutherford's model shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths.
Explanation:
Again I cannot see the options but here is what I would guess. Hope this helped and have a great day! :-)
Answer:
The atom’s positive charge is located in the atom’s nucleus.
The atom is mostly empty space
Electrons orbit around the center of the atom.
Explanation:
9. Given the following balanced chemical
equation,
6NaOH + 3Cl2 - NaClO3 + 5NaCl + 3H20
how many moles of NaCl can be formed if 6mol of NaOH were to react?
Solve: When you mix two substances, the heat gained by one substance is equal to the heat lost by the other substance. Suppose you place 143 g of aluminum in a calorimeter with 1,320 g of water. The water changes temperature by 7 °C and the aluminum changes temperature by -70.00 °C.
Water has a known specific heat capacity of 4.184 J/g °C. Use the specific heat equation to find out how much heat energy the water gained (q).
Answer:
38660.16 J
Explanation:
From the question,
Heat gained by water is given as
Q = cm(Δt)..................... Equation 1
Where c = specific heat capacity of water, m = mass of water, Δt = temperature change of water.
Given: c = 4.184 J/g.°C, m = 1320 g, Δt = 7 °C.
Substitute these values into equation 1
Q = 4.184×1320×7
Q = 38660.16 J
Hence the heat energy gained by the water is 38660.16 J
What are Earth's four interconnected global systems?
Answer:
Answer D
Explanation:
The Earth's system can be placed into four sub- groupings- : atmosphere, biosphere, lithosphere, and hydrosphere.
Answer:
Ocean, Land, Atmosphere, Life
Explanation:
Which molecule is pentanoic acid?
Answer: B.
Explanation:
CH3(CH2)3COOH, is the chemical formular for pentanoic acid and the structural formular is seen in Option B.
The basic unit of a chemical unit
Answer:
An atom
Explanation:
An atom is the basic unit of a chemical element. Atoms are made out of three main parts: protons, neutrons and electrons.
Which equipment will best separate a mixture of
iron filings and black pepper?
magnet
voltmeter
triple-beam balance
filter paper
Answer:
magnet
Explanation:
Answer:
magnet
Explanation:
I need help with that question please help me I really need it so much I been struggling and stressing a lot please it is due today at 11:00 so I will mark brainlist
Answer:
5000*C abd 1.5 million atmospheres
What happens in nuclear fission?
Answer:
I believe the answer is energy is released when an atom is split apart.
Explanation:
Nuclear fission is when the nucleus of an atom splits into two or more smaller nuclei. I hope I helped, please correct me if I'm wrong!
Glucose (molar mass=180.16 g/mol) is a simple, soluble sugar. Glucose solutions are used to treat patients with low blood sugar. Suppose you prepare a glucose solution using the described procedure. Step 1: Dissolve 263.1 g of glucose in enough water to make 500.0 mL of solution. Step 2: Transfer 19.2 mL of the solution to a new flask and add enough water to make 250.0 mL of dilute solution. What is the molar concentration of the glucose solution at the end of the procedure?
Ans180.158 g
Molar mass (glucose): 6×12.0011 g+12×1.00794 g+6×15.9994 g=180.158 g,1.5×10−1mol ×180.158 g/mol =27 g. 6 × 12.0011 g + 12 × 1.00794 g + 6 × 15.9994 g = 180.158 g , 1.5 × 10 − 1 mol × 180.158 g/ mol = 27 g.wer:
Explanation:
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The molar concentration of the glucose solution at the end of the procedure is 0.224 M.
In the first step, we dissolve 263.1 g of glucose (molar mass=180.16 g/mol) in enough water to make 500.0 mL of solution. We can calculate the molarity of the initial solution using the following expression.
[tex]M = \frac{mass\ glucose}{molar\ mass\ glucose \times liters\ solution } = \frac{263.1 g}{180.16 g/mol \times 0.5000 L } = 2.921 M[/tex]
In the second step, we take a volume (V₁) of 19.2 mL of the 2.921 M (C₁) solution and add enough water to make 250.0 mL (V₂) of dilute solution. We can find the concentration of the dilute solution (C₂) using the dilution rule.
[tex]C_1 \times V_1 = C_2 \times V_2\\C_2 = \frac{C_1 \times V_1}{V_2} = \frac{2.921 M \times 19.2 mL}{250.0 mL} = 0.224 M[/tex]
The molar concentration of the glucose solution at the end of the procedure is 0.224 M.
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Increasing pressure would most likely increase the reaction
rate between which substances?
A. A gas and a gas
B. A solid and a liquid
C. A liquid and a liquid
D. A liquid and a gas
Answer:
A
Explanation:
the same number of molecules occupy a small space
how do this question?
Answer :
(a) The name of gas given off in the reaction is hydrogen gas.
(b) When we take the test tube containing zinc and sulfuric acid near a candle or a burner, we hear a pop sound. This shows the presence of hydrogen gas.
(c) The products formed in this reaction are zinc sulfate and hydrogen gas.
(d) When the evolution of hydrogen gas will stop.
(e) The word equation for this reaction is:
Zinc + Sulfuric acid [tex]\rightarrow[/tex] Zinc sulfate +Hydrogen gas
Explanation:
As we know that when an acid reacts with a metal, then a salt and hydrogen gas are formed.
As per question, when sulfuric acid reacts with zinc metal then zinc sulfate and hydrogen gas are formed.
The word equation for this reaction is:
Zinc + Sulfuric acid [tex]\rightarrow[/tex] Zinc sulfate +Hydrogen gas
The balanced chemical reaction is as follows:
[tex]Zn(s)+H_2SO_4(aq)\rightarrow ZnSO_4(aq)+H_2(g)[/tex]
In this reaction, zinc metal displaces the hydrogen form sulfuric acid.
When we take the test tube containing zinc and sulfuric acid near a candle or a burner, we hear a pop sound. This shows the presence of hydrogen gas.
Mr. Holmes is busy making a paper mache volcano that he is sure is going to win the national science fair contest. He only has room in the volcano’s vent to put 100g of baking soda and 100ml of vinegar.
Mr. Holmes has 4 different concentrations of vinegar in his lab. The active ingredient in vinegar is acetic acid C2H4O2. Which concentration would give the most intense eruption in the volcano?
Bottle 1 shows that it has 44g of acetic acid in the 1L bottle.
Bottle 2 shows the vinegar has a molarity of 2M acetic acid
Bottle 3 shows it is 4% acetic acid by mass.
Bottle 4 when measured shows a pH of 7.
Answer:
Bottle 2 shows the vinegar has a molarity of 2M acetic acid
Explanation:
2M of acetic acid has higher concentration of acetic acid as compared to other vinegar. In 2M of acetic acid is equals to 120 gram of acetic acid in 500 ml of water which is quiet higher than other concentration of acetic acid in vinegar which is 4%. So Mr. Holmes has to use 2M of acetic acid which will produced high intense eruption in the volcano and win the national science fair contest.
NEED HELP ASAP!!!!!!!!!!!!!
A planet orbiting a star can make the star wobble.
True
False
Answer:
Actually, I think that's True.
Good Luck!~
[tex]^{Brazts[/tex]
Answer: It's True
Explanation:
Due to the planets orbiting, the star is affected by the rotation of the large object (a planet) and starts to wobble from side to side because of the weight.
what organisms can be infected by Ebola
Answer:
Ebola is a rare but deadly virus that causes fever, body aches, and diarrhea, and sometimes bleeding inside and outside the body. As the virus spreads through the body, it damages the immune system and organs. Ultimately, it causes levels of blood-clotting cells to drop. This leads to severe, uncontrollable bleeding.
Explanation:
Why is Jon Dalton’s discovery important to science? Help please
Answer:
Dalton expressed his assumption in A Modern Model of Chemical Theory that atoms of various elements should be uniformly differentiated, based on their differing atomic weights. In doing so, he became the first scientist to explain atom behavior as regards weight measurement.
Explanation:
How do the 3 parts of the “evolution recipe” work together to evolve species and increase biodiversity?
Answer:
According to the evolution theory, the organisms that are better adapted have more chances to survive and to reproduce, thereby they also have more chance to perpetuate their own genes in the next generation. This statement can be divided into three properties. First, the adaptation (or adaptive fitness) of one organism is the ability to make use of the available resources in particular environmental conditions. Second, survival is defined as the ability to identify dangerous (environmental) conditions. Finally, reproduction can be defined as the ability to leave descendants (i.e., own offspring). The most important evolutionary forces that drive this process are mutations and recombination that generate biodiversity, these forces are capable of increasing the adaptive fitness in the next generation and generating speciation.
The most important evolutionary forces that drive this process are mutations and recombination that generate biodiversity.
Evolution theory:According to the evolution theory, the organisms that are better adapted have more chances to survive and reproduce, thereby they also have more chances to perpetuate their own genes in the next generation.
First, the adaptation (or adaptive fitness) of one organism is the ability to make use of the available resources in particular environmental conditions. Second, survival is defined as the ability to identify dangerous (environmental) conditions. Finally, reproduction can be defined as the ability to leave descendants (i.e., own offspring).The most important evolutionary forces that drive this process are mutations and recombination that generate biodiversity, these forces are capable of increasing the adaptive fitness in the next generation and generating speciation.
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HELP!!!!!!!!!!!!!!
What is happening to the universe today?
A.)The universe is the same as it was billions of years ago.
B.)The universe is expanding.
C.)The universe is contracting.
Answer:
The universe is expanding
Explanation:
As long as the amount of stuff doesn't go over a critical threshold, the universe will continue to expand forever, and eventually suffer heat death, freezing out. But if there's too much stuff, the expansion of the universe will slow down and stop. Then the universe will begin to contract.
HOPE IT HELPS :)
PLEASE MARK IT THE BRAINLIEST!
Answer:
The universe is expanding
Explanation:
Its expanding in many ways as in technology, mind, life it self, its all part of a life form in the universe to create more life in earth and other places like the micro organism with the bacteria and the microscopic life form.
100. mL of a gas are obtained from a reaction at 300.⁰C. What volume will the gas occupy at 100.⁰C?
Answer:
The new volume is 65.1 mL.
Explanation:
We have,
Initial volume of the gas is 100 mL
Initial temperature is 300 degrees Celsius
It is required to find the volume the gas will occupy at 100 degrees Celsius. Charles law gives the relation between volume and temperature such that,
[tex]V\propto T[/tex]
So,
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]
V₂ is new volume
[tex]V_2=\dfrac{V_1T_2}{T_1}[/tex]
V₁ = 100 mL
T₁ = 300 C = 573.15 K
T₂ = 100 C = 373.15 K
Plugging into formula we get :
[tex]V_2=\dfrac{100\times 373.15}{573.15}\\\\V_2=65.1\ mL[/tex]
So, the new volume is 65.1 mL.
Using the periodic table as a reference, which elements could bond to form a compound most like NaCl?
Question 3 options:
Hydrogen (H) and Oxygen (O)
Potassium (K) and Fluorine (F)
Magnesium (Mg) and Iodine (I)
Lithium (Li) and Sulfur (S)
step by step
Na(sodium)=2.8.1
Cl (Chlorine)=2.8.7. sodium will give the chlorine the 1 valence electron to become stable ions.
answer
pottasium. (2.8.8.1) and Flourine(2.7)
what best explains why the box’s final kinetic energy is less than its initial potential energy
Answer:
B.Some potential energy was converted into thermal energy due to friction.
The fact that kinetic energy is not greater than potential energy is due to the fact that during motion, kinetic energy loses some of its energy as a result of heat, friction, and light energy. These losses do not occur with potential energy, which is why potential energy is always greater than kinetic energy.
What is kinetic energy ?The energy that an object has as a result of motion is known as kinetic energy. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The body holds onto the kinetic energy it acquired during its acceleration until its speed alterations.
There is no initial potential energy since the initial velocity is zero. There is no final potential energy since the end height is zero. This indicates that the total kinetic energy and total potential energy are equal. Both parties have the ability to cancel the mass.
Due to the principle of energy conservation, the initial potential energy and the end kinetic energy will be equal just before the object strikes the ground.
Thus, kinetic energy is not greater than potential energy is due to the fact that during motion.
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Which frequency of electromagnetism has higher energy and shorter wavelengths that visible light? *
white
ultraviolet
infrared
black
Answer:
ultraviolet lights have shorter wavelengths and higher frequencies
THE BRAINLIEST ANSWER ASAP!! PLEASE HELP ME OR I FAIL!!! Describe some of the rules scientists follow to reflect the uncertainty of measurements and calculations.
What happens if more product is added to a system at equilibrium?
A. More products will form.
B. Concentrations will not change.
C. Only the concentration of that product will increase.
D. More reactants will form.
Answer:
D. more Reactants will form
Explanation:
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