Answer:
the two careers in science are :
1) Engineer
2)Doctor
Explanation:
A softball is thrown with 145 Joules of kinetic energy. If the ball is moving at 20.0 m/s, what is the mass of the ball in kg?
Answer:
0.725 kg
Explanation:
Step 1: Given data
Kinetic energy of the softball (K): 145 JSpeed of the softball (v): 20.0 m/sMass of the softball (m): ?Step 2: Calculate the mass of the softball
We will use the following expression.
K = 1/2 × m × v²
m = 2 K / v²
m = 2 × 145 J / (20.0 m/s)²
m = 0.725 kg
The mass of the softball is 0.725 kg.
How many grams does 1.0 liter of motor the density of motor oil is 0.80g / mL
Which equation describes the process of photosynthesis?
carbon dioxide + glucose + sunlight → water + oxygen
oxygen + water + sunlight → glucose + carbon dioxide
oxygen + glucose + sunlight → water + carbon dioxide
carbon dioxide + water + sunlight → glucose + oxygen
Answer:
The FIRST option, give me brainliest answer pls
Explanation:
The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen
Answer:
(a)
carbon dioxide+ glucose+ sunlight * water + oxygen
Explanation:
I Took This Test Before, I Hope You Get A Good Grade On The Rest Of The Questions
What is the density of an object with a mass of 60 g and a volume of 2 cm3?
Answer:
The answer is 30 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 60 g
volume = 2 cm³
We have
[tex]density = \frac{60}{2} \\ [/tex]
We have the final answer as
30 g/cm³Hope this helps you
PLEASE HELP!?!.!,! What are the products of the combustion of a hydrocarbon?
carbon and oxygen
carbon dioxide and water
carbon and hydrogen
carbon dioxide and hydrogen
Answer:
carbon dioxide and water
Explanation:
Example: Combustion of Methane (CH₄(g))
CH₄(g) + 2O₂(g) => CO₂(g) + 2H₂O(g)**
____________________
Note: The combustion of any hydrocarbon produces CO₂ & H₂O. That is,
Ethane (C₂H₆) + O₂ => CO₂(g) + H₂O(g)
Propane (C₃H₈) + O₂ => CO₂(g) + H₂O(g)
Butane (C₄H₁₀) + O₂ => CO₂(g) + H₂O(g)
The issue remaining is to balance the reaction equation. For these type equation balance Carbon 1st, then Hydrogen and finish with Oxygen. Balancing in this order leaves Oxygen which can be balanced using fractions. If problem requires lowest whole number ratios of elements, simply multiply entire equation by 2 to get standard equation*
______________________
*Standard Equation is defined as the smallest whole number ratios of elements. The 'standard equation' is significant in that it is assumed to be at STP conditions; i.e., 0⁰C (=273K) & 1.0 Atmosphere pressure.
Ethane (C₂H₆) + 7/2O₂(g) => 2CO₂(g) + 3H₂O(g)=> 2C₂H₆ + 7O₂(g) => 4CO₂(g) + 6H₂O(g) <= Standard Form of Rxn
Propane (C₃H₈) + 5O₂(g) => 3CO₂(g) + 4H₂O(g) <= Standard Form of Rxn (no need to balance with the '2' multiple)Butane (C₄H₁₀) + 13/2O₂ => 4CO₂(g) + 5H₂O(g)=> 2C₃H₈ + 13O₂(g) => 4CO₂(g) + 5H₂O(g) <= Standard Form of Rxn
______________________
**Also, note that water, H₂O(g), is listed as a gas. In some cases it will be listed as a liquid, H₂O(l).
A substance burning in the presence of oxygen produces heat and light, a process known as combustion. Combustible compounds are defined as those substances that burn. Carbon dioxide and water are the products. The correct option is B.
The process of combustion is a chemical interaction between the fuel (hydrocarbon) and the oxygen. Heat and light energy are released when fuel and oxygen react. The flame then develops from the energy of heat and light. Hydrocarbon + Oxygen = Heat energy is the equation for a combustion reaction.
Complete combustion occurs when there is a sufficient amount of air available. The hydrocarbon fuel's carbon and hydrogen atoms undergo an exothermic reaction with oxygen to form carbon dioxide and water. Energy is released.
Thus the correct option is B.
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Solid ionic compounds have very high melting points because they
Answer:
Are held together by strong electrostatic forces of attraction between oppositely charged ions. These compounds have high melting points and high boiling points because of the large amounts of energy needed to break the many strong bonds.
Explanation:
:)
net ionic equation for Sb(OH)3 + Na2S?
Answer:
2 Sb3+ (aq) + 3 S2- (aq) ⇒ Sb2S3 (s)
Explanation:
Molecular equation for Sb(OH)3 + Na2S
2 Sb(OH)3 (aq) + 3 Na2S (aq) ⇒ Sb2S3 (s) + 6 NaOH (aq)
Ionic equation for Sb(OH)3 + Na2S
2 Sb3+ + 6 OH- + 6 Na+ + 3 S2- ⇒ Sb2S3 + 6 Na+ + 6 OH-
To get the net ionic, any duplications on the left or right side would be canceled.
∴ Thus, the net ionic equation for Sb(OH)3 + Na2S is 2 Sb3+ (aq) + 3 S2- (aq) ⇒ Sb2S3 (s)
The net ionic equation is a chemical equation that shows only those ions that are involved directly in the formation of the final product. The net ionic equation for the given reaction is [tex]\bold { 2 Sb3^+ (aq) + 3 S_2^- (aq) \rightarrow Sb_2S_3 (s)}[/tex].
Net ionic equation:It is a chemical equation that shows only those ions that are involved directly in the formation of the final product.
So, molecular equation,
[tex]\bold {2 Sb(OH)_3 (aq) + 3 Na_2S (aq) \rightarrow Sb_2S_3 (s) + 6 NaOH (aq)}[/tex]
Now, write the ionic equation,
[tex]\bold {2 Sb_3^+ + 6 OH^- + 6 Na+ + 3 S_2^- \rightarrow Sb_2S_3 + 6 Na^+ + 6 OH^-}[/tex]
To make a Net ionic equation cancel all the duplicate ions present on both sides of the equation.
[tex]\bold { 2 Sb3^+ (aq) + 3 S_2^- (aq) \rightarrow Sb_2S_3 (s)}[/tex]
Therefore, the net ionic equation for the given reaction is [tex]\bold { 2 Sb3^+ (aq) + 3 S_2^- (aq) \rightarrow Sb_2S_3 (s)}[/tex].
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Fill in the coefficients that will balance the following reaction: Fill in the blanks
_____HCIO4+___Pb(NO3)3 ->___Pb(CIO4)3+___HNO2
Answer:
3HClO⁴ + Pb(NO³)³ => Pb(ClO⁴)³ + 3HNO²
Answer:
4HCIO4+-3Pb(NO3)3-and3Pb(CIO4)3+4HNO2
cement company uses 9.30 × 105 kg of limestone daily. The limestone decomposes upon heating, forming lime and carbon dioxide:
CaCO3(s) CaO(s) + CO2(g)
What volume of CO2 at 683 torr and 25.0°C is released into the atmosphere daily by this company?
The volume of CO₂ at 683 torr and 25.0°C released into the atmosphere daily by this company is 2.53×10⁸ L
How to determine mole of CaCO₃ that decomposed Mass of CaCO₃ = 9.30×10⁵ kg = 9.30×10⁵ × 1000 = 9.3×10⁸ gMolar mass of CaCO₃ = 100 g/mol Mole of CaCO₃ =?Mole = mass / molar mass
Mole of CaCO₃ = 9.3×10⁸ / 100
Mole of CaCO₃ = 9.3×10⁶ moles
How to determine the moles of CO₂ producedBalanced equation
CaCO₃ —> CaO + CO₂
From the balanced equation above,
1 mole of CaCO₃ reacted to produce 1 mole of CO₂
Therefore,
9.3×10⁶ moles of CaCO₃ will also react to produce 9.3×10⁶ moles of CO₂
How to determine the volume of CO₂Pressure (P) = 683 torr = 683 / 760 = 0.899 atmTemperature (T) = 25.0 °C = 25 + 273 = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) = 9.3×10⁶ molesVolume (V) =?V = nRT / P
V = (9.3×10⁶ × 0.0821 × 298) / 0.899
V = 2.53×10⁸ L
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What do you know about social science?
Answer:
once hydrogen ions are outside the membrane they are allowed to flow back in. this flow is changed to energy that is stored in the bonds of new molecules.
Explanation:
Which two forms of heat transfer work together to heat water in a plastic bottle?
a. reflection and convection
b. conduction and convection
c. radiation and reflection
d. convection and reflection
When an elastic is stretched or compressed it exerts _____ force.
Answer:
When an elastic material is stretched or compressed, it exerts elastic force. This force increases the more the material is stretched or compressed. Elastic force has many uses, from hair scrunchies to bed springs.
Explanation:
1)You are given an unknown solution, which contains both aqueous barium ion, Ba2+ (aq), and aqueous lead(II)ion, Pb2+ (aq). Which of
your six solutions would allow separation of the ions
If you look at the six solutions, ammonium chloride is the one that will separate barium ion from lead (II) ion in water.
If you want to separate things in a solution, you can use a solution that preferentially precipitates one of the ions in the solution while leaving the other one in the solution.
Here, we know that chlorides are soluble except those that come from metals like gold and silver because of the rules about which ones can be soluble. This is why, when barium ion and lead (II) chloride are mixed together in water, lead II chloride preferentially precipitates. This means the ions are separated.
I hope this helps you
:)
An unknown solution, which contains both aqueous barium ion, Ba2+ (aq), and aqueous lead(II)ion, Pb2+ (aq). Therefore, option A, D and E are correct.
What is solubility ?The maximum quantity of a chemical that will dissolve in a given amount of solvent at a particular temperature is referred to as its solubility. Different compounds have very varying solubilities, which is a feature of a particular solute-solvent pair.
According to solubility rules
1.Li+, Na+, K+, NH4+ always soluble .
2.NO3-, C2H3O2- always soluble .
3.Cl- , Br-, I- insoluble with Ag+, Hg22+, Pb2+ but soluble with any other ions.
4.SO4- soluble with all the ions except Sr2+, Ba2+, Ca2+, Ag+, Hg22+, or Pb2+.
5. CO32-, PO43- soluble with Li+ , Na+, K+, NH4+ but insoluble with any other ion.
6.OH- , S2- soluble with Ca2+ , Sr2+ , Ba2+ , Li+ , Na+ , K+ , NH4+ but insoluble with any other ions.
In NH4Cl, cl- ions make precipitate with Pb2+ but not with Ba2+.So, they are separated.
In NaCl, cl- ions make precipitate with Pb2+ but not with Ba2+. So, they are separated.
In NaOH, OH- ions make precipitate with Pb2+ but not with Ba2+.So, they are separated.
Thus, option A, D and E are correct.
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Your question is incomplete, most probably your question is attached below in image.
what is the ion name of calcium?
Answer:
Ca2+
Explanation:
don't really know what to explain here, thats just the ion name.
If a mass of a mole of H2X is 34 grams, then x must represent.. (SHOW WORK)
In the formular X repesents Sulphur
H2X = 34
mass of H = 2
( 1 ) * 2 + X = 34
X = 34 - 2
X = 32
X is an element with atomic mass of 32 which is Sulphur
hope it helps....
Need Help ASAP!!!! Due in 5 min!!!
Living cells are classed as either prokaryotic or eukaryotic. Which of the following characteristic(s) identify eukaryotic cells? Select all that apply.
are produced by division of another cell
comprise most multi-celled organisms
contain cytoplasm
are the smallest unit of living matter
mostly single-celled organisms
have membrane-bound organelles
contain DNA
have a nucleus
How much precipitation is shown in the rain gauge below?
A. 1.0 inches
B. 1.1 inches
C. 1.2 inches
D. 1.4 inches
Answer: b
Explanation:
Normally the capital ÎGo° for a reaction would be determined at standard temperature with each reactant at a concentration of 1 M. Letâs assume that the 1 M 2-PG solution will reach the same equilibrium ratio that would be observed under standard conditions. The enzyme enolase catalyzes the conversion of 2-PG to phosphoenolpyruvate (PEP) in living systems. You find that when you add enolase to your 2-PG solution it reaches an equilibrium with 0.68M PEP and 0.32 M 2-PG. What is the capital ÎGo° for this reaction?
Use R= 1.987 cal/mol.K
a. +559 cal/mol
b. - 559 cal/mol
c. +379 cal/mol
d.-379 cal/mol
Answer:
d.-379 cal/mol
Explanation:
ΔG = ΔG⁰ + RT ln K
for equilibrium ΔG = 0
ΔG⁰ + RT ln K =0
ΔG⁰ = - RT ln K
PG ⇒ PEP
K = [ PEP ] / [ PG ]
= .68 / .32
= 2.125
ΔG⁰ = - 1.987 x 273 x ln 2.125
= - 409 Cal / mole
Option d is the nearest answer .
The Lewis structure of Iz is shown below. Which of the following compounds has a
Lewis structure that is electronically identical to that of 12 ?
A) HCI
B) CO
C) N2
D) BIF
O 03:01
Answer: B
Explanation:
Answer: BrF
Explanation:
The box shows the element nitrogen as it appears in the
periodic table,
N
Nitrogen
Which two parts are needed to make a neutral atom of nitrogen?
A Aruscles with seven protons and seven neutrons
B. A nucleus with three protons and four neutrons
C. Electron clouds with a total of 14 electrons
D. Electron clouds with a total of seven electrons
Answer:
Option D. Electron clouds with a total of 7 electrons.
Explanation:
For an atom to be neutral (i.e having a charge of zero), the number of protons and electrons must be equal.
Thus, to know which option is correct, we shall determine the number of protons and electrons in the nitrogen atom as given in the question above.
From the question given above, we obtained the following:
Atomic number = 7
Mass number = 14
Number of protons =?
Number of electrons =.?
Next, we shall determine the number of protons in the nitrogen atom as follow:
Atomic number of an element is simply defined as the number of protons in the atom of the element. Mathematically,
Atomic number = proton number
Atomic number = 7
Therefore,
Number of protons = 7
Next, we shall determine the number of electrons in nitrogen atom as follow:
Since the atom is neutral (i.e having a charge of zero), the number of protons and electrons are equal i.e
Number of protons = number of electrons
Number of protons = 7
Therefore,
Number of electrons = 7
Thus, the nitrogen atom must have 7 electrons in order for it to be neutral.
**** Check ****
Charge of atom = Proton – Electron
Charge = 0
Proton = 7
Electron = 7
Charge of atom = Proton – Electron
0 = 7 – 7
0 = 0
Answer:
A and D
Explanation:
Took test.
A .5 kg rocket is launched into the air with a velocity of 20m/s. What is its kinetic energy? (KE=1/2mv2)
Answer:
100
Explanation:
follow the basic order of events using the formula
V is velocity so 20m/s
M is mass so 0.5kg
20^2 is 400
so then 1/2 * 0.5 is .25
then .25 * 400 is 100 (KE)
if correct please mark brainly thanks!
What are mitochondria? Why
are
they called
the engines of cells?
Answer:
they are call the engine of the cell because they are the one that provides energy for the cells
How do you write 72,000,000 in scientific notation
Answer:
7.2 × 10^7 is the correct answers.
Thank you ☺️☺️
Which has a higher lattice energy? Na3n or Na2O. And why?
Because the extent of ionic charge is more important than ionic radius in calculating the lattice energy of ionic compounds. Because the ionic charge of the N3-ion is greater than that of the F-ion, the Na3N molecule has a higher lattice energy than the NaF complex.
The lattice energy increases when the ion charge variable is increased. As a result, ions with higher charge values generate ionic compounds with higher lattice energies. As a result, ions with lower charges lower the lattice energies of their compounds.
A large beaker has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water. What is the molarity of the solution?
A: 9.9 M
B: 10 M
C: .78 M
D: 8M
The molarity of the solution in a large beaker that has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water is 0.78M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
M = n/V
M = molarity of solutionn = number of moles V = volume of solutionMolarity = 5.25/6.75
Molarity = 0.78M
Therefore, the molarity of the solution in a large beaker that has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water is 0.78M.
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A 5.90 g sample of titanium chemically combined with oxygen to form 9.84 g of titanium oxide. What is the empirical formula of titanium oxide
The dominant gene will always show up in an organisms phenotype is represented in to genotype
true or false?
Using chemical equation to find moles of product from moles of reactant
Answer:
0.21 mole of C8H18.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
2C8H18 + 25O2 —> 16CO2 + 18H2O
Next, we shall determine the number of mole of C8H18 that reacted and the number of mole water (H2O) produced from the balanced equation.
This is illustrated below:
From the balanced equation above,
2 moles of C8H18 reacted to produce 18 moles of H2O.
Finally, we shall determine the number of mole C8H18 needed to produce 1.90 moles of H2O.
This can be obtained as follow:
From the balanced equation above,
2 moles of C8H18 reacted to produce 18 moles of H2O.
Therefore, Xmol of C8H18 will react to produce 1.90 moles of H2O i.e
Xmol of C8H18 = (2 × 1.90)/18
Xmol of C8H18 = 0.21 mole
Thus, 0.21 mole of C8H18 is needed for the reaction.
The following reaction: Mg + FeO → MgO + Fe, is an example of:
combination.
decomposition.
single-displacement.
double-displacement.
explain how heat is related to thermal energy
Answer: Heat energy is another name for thermal energy.
Explanation:
As thermal energy comes from moving particles, it is a form of kinetic energy. Thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature.
Answer:
When a substance heats up, the rise in temperature makes these particles move faster and bump into each other. Thermal energy is the energy that comes from the heated up substance. The hotter the substance, the more its particles move, and the higher its thermal energy.