Answer:
a compound. hydrogen and oxygen
What is the acceleration of a 50 kg object pushed with a force of 500 newtons?
Answer:
F = MA
500 = 50 multiply by A
A= 500/50
A= 10m/s2
Will a precipitate form when 20.0 ml of 0.10 M Ba(NOxaq) and 50.0 mL of 0.10 M NaCO(aq) are mixed together?
A. Q < K precipitate will form
B. Q > K precipitate will form
C. Q > K precipitate will not form
D. Q < K precipitate will not form
E. Cannot determine. Need more information
Answer:
B. Q > K precipitate will form
Explanation:
The reaction is;
Ba(NO3)2(aq) + Na2CO3(aq) ------> BaCO3(s) + 2NaNO3(aq)
Hence the reaction could form a precipitate of BaCO3.
Number of moles of carbonate ions = 50/1000 * 0.10 M = 5 * 10^-3 moles
Number of moles of Barium ions = 20/1000 * 0.10 M = 2 * 10^-3 moles
Total volume after reaction = 20ml + 50ml = 70 ml or 0.07 L
Molarity Barium ions = 5 * 10^-3 moles/ 0.07 L = 0.07 M
Molarity carbonate ions = 2 * 10^-3 moles/ 0.07 L =0.03 M
Q = [Ba^2+] [CO3^2-] = 0.07 * 0.03 = 2.1 * 10^-3
But K = 2.58 × 10 ^− 9
We can clearly see that Q>K therefore precipitate will form
Choose any metal atom from Group 1A, 2A, or 3A. What charge will it adopt when it ionizes?
Answer:
Positive charge.
Explanation:
Hello!
In this case, since elements belonging to groups 1A, 2A and 3A are mostly metals, we infer they have the capacity to lose electrons and therefore they become positively charged.
Some examples may be:
[tex]Na^+\\\\H^+\\\\Ca^{2+}\\\\Al^{3+}\\\\Sr^{2+}[/tex]
Best regards!
What is the answer to this?
WILL MARK BRAINLIEST Which of the following pairs of elements would most likely combine to form a salt?
(Answers up above in the image)
Magnesium and chlorine form an ionic bond in the compound Magnesium chloride which is a salt(MgCl2) or the second option
Answer:
Mg and Cl
Explanation:
If a catalyst is present in a chemical reaction, where should it be represented in the chemical equation?
Answer:
on the arrow tajtbis between the reactants and the products
When the ester ethyl butanoate, CH_3 CH_2 CH_2 COOCH_2 CH_3, is hydrolyzed under acidic conditions, which compounds are the products?
a) ethyl alcohol and butanoic acid
b) butanol and ethanoic (acetic acid)
c) ethyl alcohol and the butanoate ion
d) butanol and the ethanoate ion
Answer:
Option a
Explanation:
Ester ethyl butanoate is a Chemical compound with Molar mass of 116.16 g/mol, the Boiling point is 121 °C and the Density is 879 kg/m³.
Looking at the chemical representation of the compound, it can be shown that the chemical compound contains the an ester functional group and this it is formed through the reaction of a -COOH containing compound/salt and an alcohol.
The chemical representations showing the chemical reaction is given below;
CH3CH2CH2COOCH2CH3 + Acid(H2O, H^+) =========> C2H5OH + C4H8O2.
Thus, acidic hydrolysis of the ester gives ethyl alcohol and butanoic acid.
a) ethyl alcohol and butanoic acid
Ester ethyl butanoate is a chemical compound with molar mass of 116.16 g/mol . It contains an ester functional group and this it is formed through the reaction of a -COOH containing compound/salt and an alcohol.The chemical representations showing the chemical reaction is given below;
CH₃CH₂CH₂COOCH₂CH₂ + Acid(H₂O, H+) → C₂H₅OH + C₄H₈O₂.
Thus, acidic hydrolysis of the ester gives ethyl alcohol and butanoic acid.
Therefore, option a) is correct.
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The melting points of four impure samples of lead(II) bromide were measured. The results are
shown.
Which sample is the most pure?
temperature when
the sample started
to melt/ °C
temperature when
the sample finished
melting/°C
А
342
355
B
353
360
С
365
371
D
372
373
А
o
Answer:
D
372
373
Explanation:
The sun has been up for several hours, and it has been shining on these trees. What can the trees do because they are in sunlight? What does this mean for the number of energy storage molecules in the trees?
The trees can . . .
a give off carbon to the air. Giving off carbon allows them to make energy
storage molecules.
b give off carbon to the air. Giving off carbon uses up energy storage
molecules.
c take in carbon from the air. The carbon is used to make energy storage
molecules.
d take in carbon from the air. The carbon is used to break down energy storage molecules.
© 2018 The Regents of the University of California. All rights reserved. Permission granted to photocopy for classroom use. 1
2. These goats are eating grass on a sunny day. What is happening to the carbon in the air around the living things on the mountain? Is carbon moving into the air, moving out of the air, or both?
a Carbon is only moving into the air; it is not moving out of the air. b Carbon is moving into the air and out of the air at the same time. c Carbon is not moving into the air; it is only moving out of the air. d With this information, there is no way to know for sure.
Answer:
1. C. take in carbon from the air. The carbon is used to make energy storage
molecules.
2. b Carbon is moving into the air and out of the air at the same time
Explanation:
Question 1:
Trees are plants, which are autotrophic organisms i.e. set of organisms that are capable of producing their own food via a process called PHOTOSYNTHESIS. This photosynthetic process produces sugars (glucose) in the presence of SUNLIGHT. According to this question, the sun has been up for several hours, and has been shining on these trees. This means that the trees can take in carbo dioxide (CO2) in order to perform the process of photosynthesis. Also, the number of energy storage molecules in the trees (ATP) will INCREASE.
What can the trees do because they are in sunlight? What does this mean for the ?
The trees can take in carbon from the air, the carbon is used to make energy storage molecules and Carbon is moving into the air and out of the air at the same time when goats are eating grass on a sunny day.
What is photosynthesis?Photosynthesis is a process by which plants prepare their own food in the form of carbohydrates in the presence of sunlight.
Plants absorbs carbon dioxide from the atmosphere and in the presence of sunlight with the water molecules prepare their food in the form of carbohydrates to store energy and releases oxygen to the atmosphere, and this process is known as photosynthesis.If goats are eating grass on a sunny day then in this condition, carbon dioxide exhaled by the goats is absorbed by the plants and oxygen releases to the environment by the plants and inhaled by goats.Hence, for first point correct option is (c) and for second point correct option is (b).
To know more about atmospheric carbondioxide, visit the below link:
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How many liters of oxygen gas at 153 °C and 0.820 atm can be prepared by the
decomposition of 22.4 g of solid KCIO3?
2 KCIO3(s) > 2 KCl(s) + 3 O2(g)
Answer:
V = 11.51 L
Explanation:
Given data:
Volume of oxygen gas produced = ?
Pressure = 0.820 atm
Temperature = 153°C (153+273 = 426K)
Mass of KClO₃ = 22.4 g
Solution:
Chemical equation:
2KClO₃ → 2KCl + 3 O₂
Number of moles of KClO₃:
Number of moles = mass/molar mass
Number of moles = 22.4 g/ 122.5 g/mol
Number of moles = 0.18 mol
now we will compare the moles of KClO₃ and O₂
KClO₃ : O₂
2 : 3
0.18 : 3/2×0.18 = 0.27
Volume of oxygen:
PV = nRT
R = general gas constant (0.0821 atm.L/mol.K)
0.820 atm× V = 0.27 mol × 0.0821 atm.L/mol.K ×426 K
V = 9.44 atm.L / 0.820 atm
V = 11.51 L
Which of the following is applied on thermoplastic polymers?
Select one:
a. Their shape is determined as part of the chemical process groups
b. They can be melted and reshape
c. They are not easily recycled
d. They couldn't bend over
1. What are the possible genotypes of offspring when crossing BB, Bb parents?
A.bb, BB, Bb, Bb
B.BB, BB, BB, Bb
C.BB, Bb, Bb, BB
D.BB, BB, BB, BB
2. If you cross a purebred black fur (BB) parent with a purebred white fur (bb) parent, all the offspring will be
A.White
B.Grey
C.Hybrid
D.Purebred
Answer:
1, C: BB, Bb, Bb, BB
2. C: Hybrid
Explanation:
1. If u do a punnet square for BB and Bb you will get: BB, Bb, Bb, Bb
B| B|
B| BB. BB
b| Bb Bb
2. You do a punnet square for BB and bb and you'll get: Bb, Bb, Bb, Bb, which means all the children are hybrids of Dominant alleles ans recessive alleles
B B
b| Bb Bb
b| Bb Bb
_______oBBBBB8o______oBBBBBBB
_____o8BBBBBBBBBBB__BBBBBBBBB8________o88o,
___o8BBBBBB**8BBBB__BBBBBBBBBB_____oBBBBBBBo,
__oBBBBBBB*___***___BBBBBBBBBB_____BBBBBBBBBBo,
_8BBBBBBBBBBooooo___*BBBBBBB8______*BB*_8BBBBBBo,
_8BBBBBBBBBBBBBBBB8ooBBBBBBB8___________8BBBBBBB8,
__*BBBBBBBBBBBBBBBBBBBBBBBBBB8_o88BB88BBBBBBBBBBBB,
____*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB8,
______**8BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB*,
___________*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB8*,
____________*BBBBBBBBBBBBBBBBBBBBBBBB8888**,
_____________BBBBBBBBBBBBBBBBBBBBBBB*,
_____________*BBBBBBBBBBBBBBBBBBBBB*,
______________*BBBBBBBBBBBBBBBBBB8,
_______________*BBBBBBBBBBBBBBBB*,
________________8BBBBBBBBBBBBBBB8,
_________________8BBBBBBBBBBBBBBBo,
__________________BBBBBBBBBBBBBBB8,
__________________BBBBBBBBBBBBBBBB,
__________________8BBBBBBBBBBBBBBB8,
__________________*BBBBBBBBBBBBBBBB,
__________________8BBBBBBBBBBBBBBBB8,
_________________oBBBBBBBBBBBBBBBBBB,
________________oBBBBBBBBBBBBBBBBBBB,
________________BBBBBBBBBBBBBBBBBBBB,
_______________8BBBBBBBBBBBBBBBBBBB8,
______________oBBBBBBBBB88BBBBBBBBB8,
______________8BBBBBBBBB*8BBBBBBBBB*,
______________BBBBBBBBB*_BBBBBBBBB8,
______________BBBBBBBB8_oBBBBBBBBB*,
______________8BBBBBBB__oBBBBBBBB*,
______________BBBBBBB*__8BBBBBBB*,
_____________8BBBBBB*___BBBBBBB*,
____________8BBBBBB8___oBBBBBB8,
___________8BBBBBB8____8BBBBBB*,
__________oBBBBBB8____BBBBBBB8,
__________BBBBBBB8___BBBBBBBB*,
_________oBBBBBBB8___BBBBBBBB,
_________8BBBBBB8____BBBBBBB*,
_________BBBBBB*_____8BBBBB*,
________oBBBB8_______BBBBB*,
________oBBB8________BBBB*,
______8BBBB*_______*BBBBBBBB8o,
______BBBBB*____________*88BBBo
What are some other molecules in the plasma membrane explain their function.
43 points! ILL MARK BRAINLIEST
The plasma membrane is primarily made up of phospholipid bilayers. Other molecules, such as the steroid cholesterol, are also present.
What is plasma membrane?The plasma membrane, also referred to as the cell membrane, is the membrane found in all cells that separates the cell's interior from its surroundings.
A cell wall is basically attached to the plasma membrane on the outside of bacterial and plant cells.
Membrane biogenesis is the process by which plasma membranes form. Proteins and lipids are created first in the rough endoplasmic reticulum and then in the smooth endoplasmic reticulum.
These are then taken to the Golgi complex to be modified.
The plasma membrane is primarily made up of phospholipid bilayers.
Other compounds discovered in the membrane have included the steroid cholesterol, that also works to help the membrane maintain its shape, and transport proteins, which allow substances to pass through the membrane.
Thus, these are some other materials present in cell membrane.
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Identify each chemical reaction as endothermic or exothermic based on its description. Drag each tile to the correct location. Sodium bicarbonate reacts with citric acid. The temperature of the reaction mixture drops by 6.8°C.Zinc powder is stirred into a beaker containing copper(II) sulfate. The beaker feels warmer to the touch.Carbon in charcoal reacts with oxygen in the air. The reaction produces heat for cooking along with carbon dioxide.The chemical equation for hydrogen reacting with oxygen shows water and energy in the product.Cold packs are used to treat sports injuries. The temperature drop in the cold pack is activated by mixing ammonium nitrate with water.Salt water can treat a sore throat. Pouring salt into the water removes some of the energy from the water.
Answer:
Endothermic Reactions:
1. Cold packs are used to treat sports injuries. The temperature drop in the cold pack is activated by mixing ammonium nitrate with water.
2. Salt water can treat a sore throat. Pouring salt into the water removes some of the energy from the water.
3. Sodium bicarbonate reacts with citric acid. The temperature of the reaction mixture drops by 6.8 degrees C.
Exothermic Reactions:
1. The chemical equation for hydrogen reacting with oxygen shows water and energy in the product.
2. Zinc powder is stirred into a beaker containing copper(ll) sulfate. The beaker feels warmer to the touch.
3. Carbon in charcoal reacts with oxygen in the air. The reaction produces heat for cooking along with carbon dioxide.
Explanation:
Gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in concentrated NaOH(aq). Calculate the amount of Ga(s) that can be deposited from a Ga(III) solution using a current of 0.760 A that flows for 50.0 min.
Answer:
[tex]m_{Ga}=0.550gGa[/tex]
Explanation:
Hello!
In this case, since the applied current for the 50.0 mins provides the following charge to the system:
[tex]q=0.760\frac{C}{s}*50.0min*\frac{60s}{1min}=2,280C[/tex]
As 1 mole of electrons carries a charge of 1 faraday, or 96,485 coulombs, we can compute the moles of electrons involved during the reduction:
[tex]n_{e^-}=2,280C*\frac{1mole^-}{96,485C}=0.0236mole^-[/tex]
Then the reduction of Ga³⁺ to Ga involves the transference of three electrons, we are able to compute the moles and therefore the mass of deposited gallium:
[tex]m_{Ga}=0.0236mole^-*\frac{1molGa}{3mole^-}*\frac{69.72gGa}{1molGa} \\\\m_{Ga}=0.550gGa[/tex]
Best regards!
How can scientists use rock to learn about earths magnetic field?
Answer:
earth's magnetic field acts on a rock that contains iron, that after the rock has harden it leaves a permanent record of the magnetic field. ... as scientists study certain rocks, they discovered that the direction and strength of earths magnetic field has changed. they know this because of the record left in the rock.
Explanation:
Answer: the earth's magnetic field acts as a rock
Explanation:
What can physical properties not separate?
What volume (in mL) of 3.2 M hydrobromic acid is required to entirely dissolve 19.4 g of lithium metal?
Answer:
69.7 mL ≅ 70 mL
Explanation:
The chemical reaction between hydrobromic acid (HBr) and lithium metal (Li) produces lithium bromide (LiBr) and hydrogen (H₂) according to the following equation:
2HBr(aq) + 2Li(s) → 2LiBr(aq) + H₂(g)
Thus, 2 moles of HBr reacts with 2 moles of Li. So, the stoichiometric ratio is 1:1 (1 mol HBr reacts with 1 mol Li).
We convert the mass of Li to moles by using the molar mass (MM) of LiBr:
MM(LiBr) = 6.9 g/mol + 79.9 g/mol = 86.8 g/mol
moles of Li(s) = mass/MM(LiBr) = 19.4 g/86.8 g/mol = 0.223 moles Li(s)
Now, we can divide the moles of Li into the molarity of the HBr solution to obtain the volume in liters wee need to add:
V = moles Li(s)/M = (0.223 mol)/(3.2 mol/L) = 0.0697 L
0.0697 L x 1000 mL/1 L = 69.7 mL ≅ 70 mL
Therefore, 70 mL of 3.2 M HBr are needed to entirely dissolve the metal.
What is 1.06 x 10^-2
Answer:
0.0106
Explanation:
The part in the middle with a coil of wire wrapped around a metal shaft is part of an electric motor. What is it?
The real topic of this question is Science, but it doesn’t give me that option.
Answer:
rotor
Explanation:
The part of the motor being pointed to is called the rotor.
⟹ The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis.
⟹ The stator core, stator winding and the outer frame are the three parts of the stator whereas the rotor core and field winding are the parts of the rotor. The three-phase supply is given to the winding of the stator. The rotor is excited by the DC supply.
⟹ The rotor speed, rotational speed of the rotor, is usually measured in rotations per minute (rpm) or tip speed in feet per minute.
When an atom loses an electron, we say that the atoms was ____________________.
Answer:
However, if something happens to make an atom lose or gain an electron then the atom will no longer be neutral.
Explanation:
A charged atom is called an ion. When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.
A 10.0 cm3 sample of copper has a mass of 90 g. What is the density of copper?
Answer:
9 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]From the question we have
[tex]density = \frac{90}{10} = 9 \\ [/tex]
We have the final answer as
9 g/cm³Hope this helps you
Compound C with molar mass 205gmol-1 , contains 3.758g of carbon , 0.316g of hydrogen and 1.251g of oxygen. Determine the molecular formula.
Answer:
Molecular formula => C₁₂H₁₂O₃
Explanation:
From the question given above, the following data were obtained:
Molar mass of compound = 205gmol¯¹
Mass of Carbon (C) = 3.758 g
Mass of Hydrogen (H) = 0.316 g
Mass of Oxygen (O) = 1.251 g
Molecular formula =?
We'll begin by determining the empirical formula of the compound. This can be obtained as follow:
C = 3.758 g
H = 0.316 g
O = 1.251 g
Divide by their molar masses
C = 3.758 /12 = 0.313
H = 0.316 /1 = 0.316
O = 1.251 /16 = 0.078
Divide by the smallest.
C = 0.313 / 0.078 = 4
H = 0.316 / 0.078 = 4
O = 0.078 / 0.078 = 1
Thus, the empirical formula of the compound is C₄H₄O
Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:
Molar mass of compound = 205gmol¯¹
Empirical formula => C₄H₄O
Molecular formula =>?
[C₄H₄O]ₙ = 205
[(12×4) + (4×1) +16]n = 205
[48 + 4 +16]n = 205
68n = 205
Divide both side by n
n = 205 / 68
n = 3
Molecular formula => [C₄H₄O]ₙ
Molecular formula => [C₄H₄O]₃
Molecular formula => C₁₂H₁₂O₃
g arrange the gases in order of increasing density when they are all under stp conditions. Argon florine neon chlorine
Answer:
Florine, Neon, Chlorine and Argon.
Explanation:
The density of a gas varies in direct proportion with its molecular mass. This means, higher molecular mass gases would have higher density and vice versa.
Increasing Density = Increasing Molecular mass
Arranging Argon, Florine, Neon and Chlorine in order of increasing molecular mass, we have;
Florine, Neon, Chlorine and Argon.
Draw the structural formula for the principal organic product formed in the reaction of methyl benzoate and excess phenylmagnesium bromide, then H3O+.
Answer:
Explanation:
Esters (methyl benzoate) react with Grignard reagents to form ketones. Ketones which are more reactive than esters then react with Grignard reagents to form the tertiary alcohol triphenylmethanol. Therefore, we can say Esters reacts with two identicals of Grignard reagents. The reaction proceeds so that methyl benzoate reacts with excess phenylmagnesium bromide, followed by the protonation of H3O+ to form triphenylmethanol.
CHECK THE DIAGRAM BELOW FOR THE STRUCTURAL FORMULA.
Translate this word equation into a formula equation:
Barium + Gold (II) Phosphate -> Gold +
Barium Phosphate
Explain how to write the chemical formula for sodium (Na +) and the polyatomic ion carbonate (Co2).
Explanation:
sodium (Na +)
Carbonate ion (CO₃²⁻)
Ionic compounds are formed between ions (Anions and Cations).
For a neutral compound to be formed, the charges of the ions must cancel each other out.
Sodium ion has a charge of +1
Carbonate ion has a charge of -2
The only way to make sure both ions have similar charges is to multiply each ion by the coefficient of the other.
Thus we have;
Sodium ion = +1 * 2 = +2
Carbonate ion = -2 * 1 = -2
From this, the chemical formular of the product formed between both ions must contain 2 sodium ions and one carbonate ion.
This is given by;
Na₂CO3
14. What two atoms are needed to make rust?
air and water or iron and oxygen
Answer:
iron and oxygen
Explanation:
air and water are not atoms.
Which best describes what a refrigeration system would do?
O It adds cold air through the room.
O It moves the thermal energy to another place.
O Itallows coolant to release cold air into the room.
O It transfers energy from the ground.
Answer:
It moves the thermal energy to another place.
Explanation:
Answer:
B is correct in edge
The chemical equation below shows the process of forming water. Balance the equation by calculating the coefficients. H2 + O2 H2O A. 2, 1, 2 B. 1, 1, 1 C. 1, 1, 2 D. 1, 2, 2
Answer: A. 212
Explanation:
