Answer:
Dark matter makes up 85% of the mass of the universe. Dark matter is not directly observable because it doesn't interact with any electromagnetic wave. In the development of the universe, without dark matter, the universe will not function, move or rotate as it does now (this speculation led to the quest to find the anomaly of mass and energy in the known universe, eventually leading to the idealization of dark matter) and will not have enough gravitational force to hold it together. After the big bang, the presence of dark matter and energy ensured that the newly formed universe didn't just float away, rather, it provided enough gravitational force to hold the universe while still allowing it to expand sufficiently.
The development of the universe would have been different without the universe in the sense that the young universe won't have enough mass to hold it together, and the universe would have simply floated apart. The behavior of the universe would have been different from what we observe now, and some physical laws that applies now will not apply to the universe.
Without dark matter, the universe will neither move, rotate, or be able to function.
It should be noted that dark matter makes up about 85% of the mass of the universe. Dark matter does not interact with an electromagnetic wave.
Without dark matter, the universe will neither move, rotate, or be able to function. After the big bang, the dark matter was vital in providing the gravitational force to hold the universe.
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Do household items tend to be more acidic or basic? Are you surprised? Why or why not?
Answer:
they tend to be base
Explanation:
this because when they are manufactured they dont tend to use acid solution
12. How many grams of glucose (C6H1206) is produced if 17.3 mol of H20 is reacted according to this
balanced chemical equation? 6CO2 + 6H20 - C6H12O6 + 602
13. Nitroglycerin (C3H5(ONO2)3] is made by reacting nitric acid (HNO3) with glycerol [C3H5(OH)3]
according to this reaction:
C3H5(OH)3 + 3HNO3 - C3H5(ONO2)3 + 3H20
If 87.4 g of HNO3 is reacted with excess glycerol, what mass of nitroglycerin can be made?
Answer:
1. 17.3 MOLES OF WATER WILL PRODUCE 518.4 G OF GLUCOSE.
2. 87.4 G OF HNO3 WILL PRODUCE 7.86 G OF NITROGLYCERIN WHEN REACTED WITH EXCESS GLYCEROL.
Explanation:
1. How many grams of glucose is produced from 17.3 mole of water?
Equation:
6CO2 + 6H20 ------> C6H12O6 + 6O2
From the reaction, 6 moles of carbon dioxide reacts with 6 moles of water to produce 1 mole of glucose
So therefore,
6 moles of water = 1 mole of glucose
Since 17.3 mole of water was used, we can first calculate the number of moles of glucose produced:
Then, we have:
6 moles of water = 1 mole of glucose
17.3 moles of water = ( 17.3 * 1/ 6) moles of glucose
= 2.883 moles of glucose
So we say 17.3 moles of water produces 2.883 moles of glucose
At standard conditions, 1 mole of a substance is its molar mass
Molar mass of water = 18 g/mol
Molar mass of glucose = 180 g/mol
From the reaction:
17.3 moles of water produces 2.883 moles of glucose
17.3 * 18 g of water produces 2.833 * 180 g of glucose
= 518.94 g of glucose.
From 17.3 mole of water, 518.4 g of glucose will be produced.
2.
C3H5(OH)3 + 3HNO3 -------> C3H5(ONO2)3 + 3H20
3 moles of HNO3 reacts to produce 1 mole of nitroglycerin
Molar mass of HNO3 = ( 1 + 14 + 16*3) = 63 g/mol
Molar mass of nitroglycerin = ( 12 *3 + 1 *5 + 16*6 + 14*3) = 179 g/mol
3 moles of HNO3 = 1 mole of nitroglycerin
3 * 63 g of HNO3 = 179 g of nitroglycerin
if 87.4 g of HNO3 were to be reacted, we have:
189 g of HNO3 = 179 g of nitroglycerin
87.4 g of HNO3 = ( 87.4 * 179 / 189) of nitroglycerin
= 7.86 g of nitroglycerin
So therefore, 87.4 g of HNO3 will produce 7.86 g of nitroglycerin when reacted with excess glycerol.
Compare and contrast analog and digital signals
Answer:
ones analog and ones digital.
Explanation:
The difference between the two are that one loses quality but is easier to transfer, however digital takes longer to transfer, however this makes the quality the same.
A sample of hydrogen peroxide (H202) has 2.0 grams of hydrogen (H) and 32 grams of oxygen (O). What is the percent composition of hydrogen peroxide
Answer:
O = 94.117%
H = 5.882%
Explanation:
Hydrogen peroxide (H202) Molar Mass = 34g
OH 1- 17g/mol
H 1+ = 1g/mol
O = 16g/mol
2 Grams H
32 grams O
Percentage composition of Hydrogen peroxide
O = 32/34 = 94.117%
H = 2/34 = 5.882%
5)
A battery is connected to a motor. The battery releases enough energy to perform 200 J of work, but the motor produces only 90 J.
Why
The battery has a leak
Some energy is released as heat.
The motor is connected improperly.
The motor is connected to the battery in parallel
HELP
Answer:
some energy is released as heat
Answer:
Some energy is released as heat.
Explanation:
hope this helps :)
If a specimen exhibited 1/8th of the original carbon-14, how many years has it been since that specimen was alive?
What kind of solution would have a ka value that is much less than 1?
A. A weakly basic solution
B. A strongly basic solution
C. A strongly acidic solution
D. A weakly acidic solution
Answer:
D. A weakly acidic solution.
The molarity of a solution containing 7.1 g of sodium sulfate in 100 mL of an aqueous solution is
Answer:
0.5 M
Explanation:
First we have to start with the molarity equation:
[tex]M=\frac{mol}{L}[/tex]
We need to know the amount of moles and the litters.
If we have 100 mL we can convert this value to “L”, so:
[tex]100~mL\frac{1~L}{1000~mL}[/tex]
[tex]0.1~ L[/tex]
Now we can continue with the moles, for this we have to know the formula of sodium sulfate [tex]Na_2SO_4[/tex], with this formula we can calculate the molar mass if we know the atomic mass of each atom on the formula (Na: 23 g/mol, S: 32 g/mol, O: 16 g/mol). We have to multiply each atomic mass by the amount of atoms in the formula, so:
[tex]molar~ mass~=~ (23*2)+(32*1)+(16*4)= ~ 142~ g/mol[/tex]
In other words:
[tex]1~mol~ Na_2SO_4=~142~g~ of~Na_2SO_4[/tex]
Now we can calculate the moles:
[tex]7.1~g~ of~Na_2SO_4\frac{1~mol~ Na_2SO_4}{142~g~ of~Na_2SO_4} [/tex]
[tex]0.05~mol~ Na_2SO_4 [/tex]
Finally, we can calculate the molarity:
[tex]M=\frac{0.05~mol~ Na_2SO_4 }{0.1~ L}[/tex]
[tex]M=0.5[/tex]
I hope it helps!
Answer:
0.50M of solution
Explanation:
Molarity is defined as the ratio between moles of solute (In this case, sodium sulfate, Na₂SO₄) per liter of solution.
Moles of 7.1g of Na₂SO₄ (Molar mass: 142g/mol) are:
7.1g Na₂SO₄ × (1mol / 142g) = 0.05 moles of Na₂SO₄.
In 100mL = 0.100L:
0.05 moles Na₂SO₄ / 0.100L = 0.50M of solution
What do acids do in solution?
O A. They increase the pH.
O B. They form hydroxide ions.
O C. They increase the [H").
O D. They dissociate into salts.
Answer:
C.
Explanation:
The increase the [H+] (concentration of H+ ions)
However, they decrease the pH if acids are added to any solution. Since they have more [H+] ions, they increase their conc. in the solution
If Uranium-240 emits an alpha particle, what does it transmutate into?
A)Thorium -236
B)Thorium-238
C)Plutonium-244
D)Uranium-235
Answer:
d
Explanation:
Write the name of the chemical missing in this equation
calcium carbonate + hydrochloric acid --> calcium chloride + water +............
A)hydrogen
B)oxygen
C)nitrogen
D)carbon dioxide
Answer:
D
Explanation:
the calcium reacts with the chloride in the hydrochloric making calcium chloride.
the hydro in hydrochloric becomes water leaving us with carbonate which turns into carbon dioxide.
(in simple terms)
Name the region of the atom where electrons are located.
Answer:
The electrons are found on the atomic nucleus.
Explanation:
1. Chlorobenzene, C6H5C1, is used in the production of chemicals such as aspirin
and dyes. One way that chlorobenzene is prepared is by reacting benzene, C6H6.
with chlorine gas according to the following BALANCED equation.
C6H6 (1) + Cl2 (g) → C6H5Cl (s) + HCI (g)
3. How many moles of each type of atom are in 1.0 mol of C6H12O6?
4. How many molecules are in 16.8 mol of H2O?
5. How many moles are present in 100.0 g of Al?
The following reaction shows the products when sulfuric acid and aluminum hydroxide react
Answer:
I can't see the picture so I'm not able to help you.
Explanation:
I'm incredibly sorry. Try to have a blessed day.
8.
A sheep owner is caring for a sick lamb that has a severe navel infection. He gives the
lamb 2 cc of Ampicillin 4 times a day for three days. If each cc contains 125 mg of Ampicillin what is
the total number of mg of Ampicillin given to the lamb?
Answer:
900 mg
Explanation:
10. How any grams of N He are required to produce 120 grams of HNO3, assuming H2O2 is present in
excess?
N2H4 + 7 H2O2 → 2 HNO3 + 8 H2O
H2O2
N2H4
32
HNO3
63
H2O
18
34
Molar Mass
(g/mol)
Answer:
30.48g of N2H4
Explanation:
Step 1:
The balanced equation for the reaction. This is given below:
N2H4 + 7H2O2 → 2HNO3 + 8H2O
Step 2:
Determination of the mass of N2H4 that reacted and the mass HNO3 produced from the balanced equation. This is illustrated below:
Molar mass of N2H4 = (14x2) + (4x1) = 32g/mol
Mass of N2H4 from the balanced equation = 1 x 32 = 32g
Molar Mass of HNO3 = 1 + 14 + (16x3) = 63g/mol
Mass of HNO3 from the balanced equation = 2 x 63 = 126g
Summary:
From the balanced equation above,
32g of N2H4 reacted to produce 126g of HNO3.
Step 3:
Determination of the mass of N2H4 required to produce 120g of HNO3. This is illustrated below:
From the balanced equation above,
32g of N2H4 reacted to produce 126g of HNO3.
Therefore, Xg of N2H4 will react to produce 120g of HNO3 i.e
Xg of N2H4 = (32 x 120)/126
Xg of N2H4 = 30.48g
Therefore, 30.48g of N2H4 is required to produce 120g of HNO3.
With phenol the formaldehyde forms a polymer that is part of the plastic bakelite. Okay, but what is the equation????? I can’t find it
Answer:
Phenol reacts with formaldehyde to form Phenol-formaldehyde resins which is used to make plastic bakelite. Phenol-formaldehyde resins are made through a step-growth polymerization reaction.
equation of polymerization reaction in which Phenol (HOC6H5) reacts with formaldehyde (CH2O) is as following:
1. HOC6H5 + CH2O => HOC6H4CH2OH (hydroxymethyl phenol)
hydroxymethyl phenol then reacts with another hydroxymethyl group in next two steps and form methylene bridge (at firs) and ether bridge (secondly)
2. HOC6H4CH2OH + HOC6H5 => (HOC6H4)2CH2 + H2O
3. 2 HOC6H4CH2OH => (HOC6H4CH2)2O (bisphenol F) + H2O
Bisphenol F is the the diphenol (HOC6H4)2CH2 that is formed as the result and used to produce epoxy resins.
In a single displacement reaction between sodium phosphate and barium, how much of each product (in grams) will be formed from 10.0 grams of barium?
Answer:
A. 3.36g of Na.
B. 14.62g of Ba3(PO4)2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
3Ba + 2Na3PO4 → 6Na + Ba3(PO4)2
Next, we shall determine the mass of Ba that reacted and the mass of Na and Ba3(PO4)2 produced from the equation.
This is illustrated below:
Molar Mass of Ba = 137g/mol
Mass of Ba from the balanced equation = 3 x 137 = 411g
Molar mass of Na = 23g/mol
Mass of Na from the balanced equation = 6 x 23 = 138g
Molar mass of Ba3(PO4)2 = (3 x 137) + 2[31 + (4x16)] = 411 + 2[31 + 64] = 601g/mol
Mass of Ba3(PO4)2 from the balanced equation = 1 x 601 = 601g
Summary:
From the balanced equation above,
411g of Ba reacted to produce 138g of Na and 601g of Ba3(PO4)2.
A. Determination of the mass of Na produced by reacting 10g of Ba.
From the balanced equation above,
411g of Ba reacted to produce 138g of Na.
Therefore, 10g of Ba will react to produce = (10 x 138)/411 = 3.36g of Na.
Therefore, 3.36g of Na is produced.
B. Determination of the mass of Ba3(PO4)2 produced by reacting 10g of Ba.
From the balanced equation above,
411g of Ba reacted to produce 601g of Ba3(PO4)2.
Therefore, 10g of Ba will react to produce = (10 x 601)/411 = 14.62g of Ba3(PO4)2.
Therefore, 14.62g of Ba3(PO4)2 is produced.
what radius (mm) must a steel (iron) ball bearing have if it is to have a mass of 3.25g? density of iron = 7.86g/cm3 V=4/3 pie r3
Answer:
Radius of the steel ball is 4.6mm
Explanation:
Hello,
To find the radius of the steel, we'll have to calculate it from it's volume which can be gotten from the density of the material.
Data;
Mass = 3.25g
Density = 7.86g/cm³
Density = mass / volume
Volume = mass / density
Volume = 3.25 / 7.86
Volume = 0.413cm³
Volume of a steel = 4/3πr³
0.413 = 4/3 × π × r³
0.413 = 1.33 × 3.14 × r³
0.413 = 4.1762r³
r³ = 0.413 / 4.1762
r³ = 0.099
Take the cube root of both sides
r = 3√(0.099)
r = 0.46cm
From metrics table
1cm = 10mm
0.46cm = x mm
x = (0.46 × 10)
x = 4.6mm
The radius of the steel ball is 4.6mm
All the elements in this group form __________ ions with a positive _________ charge. _____________ is the most reactive element in the group.
(group 2-alkaline earth metals)
Answer:
1) positive
2)2
3)strontium
Explanation:
please help asp its timed
How do radio waves compare to visible light in terms of the energy?
Radio waves carry more energy
Radio waves carry less energy
Radio waves and visible light carry the same energy
Neither radio waves nor visible light carry energy.
Answer:
Radio waves and visible light have many different properties
Explanation:
Radio waves have less energy since it's waves are stretched out really long. the longer the light waves, the lower the energy, and since radio waves have more stretched out waves than visible light, the radio waves carry less energy.
convert 5.68g of NaCl to moles
Answer:
The answer is 0.10026903242265733
Please say which is the anode (oxidation) and which is the cathode (reduction)
2H+ + 2e- ➖> H2 (g)
2I- ➖> I2 + 2e-
Explanation:
1st one will be cathodic reaction and reduction will occur since electrons are being gained and hydrogen goes from +1 to zero oxidation state.
2nd one will be anodix reaction and oxidation will take place because Iodide ion's oxidation number increases from -1 to 0
What is the mass of 1.450 mol Cd3N2?
124,2 g
234.7 g
529.6 g
738.9 g
529.6 g Cd₃N₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
1.450 mol Cd₃N₂
Step 2: Identify Conversions
Molar Mass of Cd - 112.41 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of Cd₃N₂ - 3(112.41) + 2(14.01) = 365.25 g/mol
Step 3: Convert
[tex]\displaystyle 1.450 \ mol \ Cd_3N_2(\frac{365.25 \ g \ Cd_3N_2}{1 \ mol \ Cd_3N_2} ) = 529.613 \ g \ Cd_3N_2[/tex]
Step 4: Check
Follow sig fig rules and round. We are given 4 sig figs.
529.613 g Cd₃N₂ ≈ 529.6 g Cd₃N₂
Answer:
529.6 g
Explanation:
i took the test
Does this make a reaction? Because both products are soluble.
Answer:
Yes.
Explanation:
It will react. Because they are compounds
What is the study of how matter and energy interact? A. Biology B. Chemistry C. Planetary science D. Physics
Answer:
Chemistry
Explanation:
Chemistry is the study of matter, its properties, how and why substances combine or separate to form other substances, and how substances interact with energy
Answer:
D. Physics
Explanation:
First, let's define all the answer choices.
Biology: Biology is the study of life and living things. Biology deals with the function, growth, origin and more of organisms.
Chemistry: Chemistry is the study of matter, elements, atoms, compounds, molecules and more. Chemistry is also concerned with chemical reactions.
Planetary science: Planetary science is basically the study of planets. This is the study of planets, moons and planetary systems.
Physics: Physics is the study of matter, energy, and their interactions. This helps us to explain and understand things that happen in the universe.
The best choice is D. Physics. Physics is the study of how matter and energy interact.
PLZ HELP!! I WILL GIVE BRAINLIEST!! 50+PTS!! PLZ HELP!!!! In an exothermic reaction at equilibrium, what is the effect of lowering the temperature? A. The reaction makes more products. B. The reaction makes more reactants. C. The reaction is unchanged.
Answer:
A. your reaction makes more products.
Explanation:
This is a fun question dealing with idea of Le Chatelier's principle.
In an exothermic reaction, you produce heat. This means that heat will act as a product (or be on the product side).
Suppose there's an imaginary equation:
A + B -----> C (Now if I lower the amount of B, the equilibrium will shift to left to make up the lost B, or to bring the system back to equilibrium)
Apply the same concept as above below:
A + B -------> C + Heat (as I mentioned, since this is exothermic reaction heat is written as product, so if you lower the temperature, which means basically lower the heat, the reaction will shift towards right to make up the lost heat, in this process you will make extra C which is products. Thus, your reaction makes more products.
Answer:
reaction makes more product
What is the basic unit of energy?
Answer:
The basic unit of energy is the joule, also known as SI unit
Explanation:
1 Point
What energy conversion in your body enables you to get out of bed in the
morning?
O A. Chemical energy to kinetic energy
O B. Kinetic energy to potential energy
O C. Chemical energy to heat energy
O D. Heat energy to kinetic energy
SUBMIT
Answer:
KINETIC ENERGY
Explanation: