Answer: When a chemical reaction occurs, _____.
a phase change takes place
the physical and chemical properties of the products are different from the reactants
Explanation:
A chemical change is like dynamite exploding or iron rusting. It's an actual change in the chemical makeup resulting in a new product
A chemical reaction results in the production of new substances with physical and chemical properties that are different from the reactants, unlike a physical change which does not alter the molecular structure of the substance.
Explanation:When a chemical reaction occurs, the physical and chemical properties of the products are different from the reactants. A chemical reaction involves a change in the composition of the substances in question where bonds between atoms are broken and/or formed, resulting in the production of new substances. These new products exhibit different physical and chemical properties such as melting point, color, taste, etc. This is in contrast to a physical change which only affects the appearance or form of a substance without altering its molecular structure. Chemical changes are often more difficult to reverse than physical changes. For example, combining hydrogen and oxygen to produce water is a chemical change because it results in the formation of a new substance with different properties than those of the individual reactants.
PLEASE ANSWER !!!
2H2 + O2 —> 2H20 + energy
What type of reaction is represented by this equation ?
- decomposition
-double replacement
-Single replacement
-synthesis
Answer: synthesis reaction.
Explanation:
The type of reaction represented by the equation is synthesis reaction.
Definition of synthesis reactionA synthesis reaction is simply defined as reaction in which two or more substances react to produce a single new substance which has characteristics different from the reactants.
Considering the equation given, we can conclude as follow:
2H₂ + O₂ —> 2H₂0 + energy
The reaction is a synthesis reaction since H₂ and O₂ combined to produce a single product i.e H₂O
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Which electromagnet is stronger and why?
if you have 0.5 grams of CaCl2 dissolved to make 15mL of solution, what is the molarity of the solution?
Answer:
0.3M
Explanation:
Molarity of a solution is given by;
M=n/v
Where;
n= number of moles of solute = mass of solute / molar mass
v= volume of solution
n= mass of CaCl2 / molar mass of CaCl2
Mass of CaCl2 = 0.5
Molar mass of CaCl2 = 40 + (2×35.5)
= 111g/mol
n = 0.5/111 = 0.0045mol
volume, v= 15mL = 15/1000 L = 0.015L
Note that molarity is in mole per liter, hence we convert 15mL to L. 1mL=1/1000L
M =0.0045/0.015
M=0.3mol/L
Therefore, the molarity of the solution is 0.3M
Which components of the apparatus affect its motion?
Answer:
An internal force acts between elements of the system. ... Only external forces affect the motion of a system, according to Newton's first ... Newton's second law states that a net force on an object is responsible for its ... Prior to manned space flights, rocket sleds were used to test aircraft, missile equipment, and physiological
Explanation:
PLEASE HELP!!!!
A foundry worker places a 5.78 kg sheet of cobalt at a temperature of 11°C on top of a 16.6 kg sheet of lead at 63°C. Assuming no heat is lost to the surroundings, calculate the final temperature of the two sheets of metal.
Answer:
35ºC
Explanation:
You need the specif heat capacities of both cobalt and lead.
Specific heat of cobalt: 0.42 J/g.ºCSpecific heat of lead: 0.13 J/g.ºCWhen the two sheets reach the thermal equilibrium their temperatures are equal.
You can use the equations for the thermal heat to find the equilibrium temperature:
Thermal heat released by the hot sheet, lead:
Q = m × C × ΔTQ = 16.6 kg × 0.13J/g.ºC × (63ºC - T)Thermal heat absorbed by the cold sheet, cobalt:
Q = m × C × ΔTQ = 5.78 kg × 0.42J/g.ºC × (T - 11ºC)Equal the two equations to solve for T:
16.6 kg × 0.13J/g.ºC × (63ºC - T) = 5.78kg × 0.42J/g.ºC × (T - 11ºC)I remove the units for easier handling:
135.954 - 2.158T = 2.4276T - 26.70364.5856T = 162.6576T = 35.47ºCRound to 2 significant figures: 35ºC ← answer
What property is used to calculate the ph of a solution
A. The hydrogen ion concentration in mol/L
B. The hydrogen ion concentration in ppm
C. The hydrogen ion concentration in mg/dL
D. The hydrogen ion concentration in mol/kg
help if u help ill give you a rhino
Final answer:
The pH of a solution is calculated using the hydrogen ion concentration in mol/L (molarity) by taking the negative logarithm of that concentration.
Explanation:
The property used to calculate the pH of a solution is A. The hydrogen ion concentration in mol/L. To calculate pH, we first measure the concentration of hydrogen (H+) ions in moles per liter (molarity). Then, we take the negative logarithm of this concentration to find the pH value. For instance, a concentration of 0.01 M H+ ions results in a pH of 2 because the negative log of 0.01 is 2. The pH scale typically ranges from 0 to 14, with 7 being neutral. A pH less than 7 indicates an acidic solution, while a pH greater than 7 indicates a basic solution.
a metal has a mass of 54g and a volume of 9 cm. what is the density of the meatal
Answer:
6gm/cm³
Explanation:
It's simple,
The formula to Density is as follows,
Mass
Density = --------
Volume
Grams is a measurement of Mass and Cubic center meters is a measurement of Volume. Thats why we will fill in the formula like this,
54
D = -------
9
Then we divide to get,
D = 6
Next we fill in the units which are grams and cubic centimeters. The initials for the 2 are gm and cm³ so we'll combine those into this,
gm/cm³
Next we combine our answers which also brings us to our answer- 6 gm/cm³
Hope I was helpful,
Toodles
What to do when tired and can not sleep?
Answer: listen to relaxing music
3. A 4.3 L balloon us at 359 K. What Volume will the gas in the balloon occupy at 250 K?
Answer:
3.0 L
Explanation:
V1/V2 = T1/T2
4.3L / V2 = 359K/250K
V2 = (4.3*250)/359 ≈ 3.0 L
PLEASE HELP, ON A TIMER!!! WILL MARK BRAINLIEST
Consider the total ionic equation below.
Upper B a superscript 2 plus, plus 2 upper N upper O subscript 3 superscript minus, plus 2 upper N a superscript plus, plus upper C upper O subscript 3 superscript 2 minus right arrow upper Ba upper C Upper O subscript 3 plus 2 upper N a superscript plus, plus 2 upper N upper O subscript 3 superscript minus.
Which is the net ionic equation for the reaction?
Upper B a superscript 2 plus, plus upper C upper O subscript 3 superscript 2 minus right arrow upper B a upper C upper O subscript 3.
2 upper N a superscript plus, plus upper C upper O subscript 3 superscript 2 minus right arrow upper N a subscript 2 upper C upper O subscript 3.
Upper N upper O subscript 3 superscript minus, plus upper N a superscript plus right arrow upper N a upper N upper O subscript 3.
Upper B a superscript 2 plus, plus 2 upper N upper O subscript 3 superscript minus right arrow upper B a (upper N upper O subscript 3) subscript 2.
Answer:
Upper B a superscript 2 plus, plus 2 upper N upper O subscript 3 superscript minus right arrow upper B a (upper N upper O subscript 3) subscript 2.
I think...
Answer: Upper N upper H subscript 4 superscript plus. and Upper S upper O subscript 4 superscript 2 minus.
Explanation: The spectator ions in this reaction are the ammonium ion and the sulfate ions.
In a reaction, not all of the ions are reacting. The ions not reacting are called the spectator ions.
When we eliminate such ions, we get an overall view of the reaction.
The reaction is:
2NH₄⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ ⇒ 2NH₄⁺ + 2H₂O + SO₄²⁻
In ionic equations, water soluble reactants and products are split into their constituent ions while non-ionizing or gaseous reactants and products are represented as formulae or molecules.
The species that are not reacting and appears on both sides are 2NH₄⁺ and SO₄²⁻ and are the spectator ions.
These non-reactive species are eliminated from the overall ionic equation that shows the reacting ions only.
PLEASE HELP ME ! A group of students performed an experiment in which they dropped a cube of metal into a graduated cylinder of water. The initial temperature of the water was 25 'C. The mass of the water was 50 g
After energy in the form of heat was transferred to the water, its temperature was 35 C. Based on the evidence, how much energy was transferred between the metal and the water?
0.2 cal
10 cal
so call
• 500 cal
The amount of energy transferred between the metal and the water is 500 cal.
Explanation:The amount of energy transferred between the metal and the water can be calculated using the formula:
Energy = Mass of water × Specific heat of water × Change in temperature
Given that the initial temperature of the water was 25 °C and the final temperature was 35 °C, and the mass of the water was 50 g, we can substitute these values into the formula:
Energy = 50 g × 1 cal/g °C × (35 °C - 25 °C)
= 500 cal
Therefore, 500 cal of energy was transferred between the metal and the water.
Convert 5 moles H2O to liters
Which statements describe the inner planets?
Complete Question:
Which statements describe the inner planets? Select three options.
A. Uranus is one of the inner planets.
B. Mercury is one of the inner planets.
C. The inner planets are also called terrestrial planets.
D. The inner planets are larger than the outer planets.
E. Gases escaped from them during the planets’ formation.
Correct Option:
The statements which describe the inner planets are as follows:
B. Mercury is one of the inner planets.
C. The inner planets are also called terrestrial planets.
D. Gases escaped from them during the planets’ formation.
Explanation:
We have the smallest planet in the inner solar system - Mercury, Venus, Earth and Mars, which are so identified for being near to the Sun. A terrestrial planet, a telluric planet, or a rocky planet is a world made up predominantly of rocks of silicate or metal. The outer planets in the solar system are the nearest inner planets to the Earth.
The planets inside are smaller than the outer planets. When the fusion began on the Sun a huge seismic eruption would have originated from the Sun's core and erupted externally. It produced a concussion wave that washed away the inner planets' thick gaseous atmospheres, just like a candle flame bursts out of its wick when you unexpectedly blow.
If an atom has 17 protons, 14 neutrons, and 20 electrons, what is the atom's electrical charge?
A. -3
B. -4
C. +4
D. -7
Answer:
-3
Explanation:
Calculate the molar mass of NH4NO3.
Answer:
80.043 g/mol
Explanation:
Ammonium nitrate is a chemical compound, the nitrate salt of the ammonium cation. It has the chemical formula NH ₄NO ₃, simplified to N₂H₄O₃. It is a white crystalline solid and is highly soluble in water. It is predominantly used in agriculture as a high-nitrogen fertilizer.
name the following hydrocarbons
Answer:
1) 3-methylpentane 2)Butyne
Explanation:
On the first molecule, we have a methyl group on the 3rd carbon, so you will have "3-methhyl". It's a 5 carbon molecule with no double bonds, so "-pentane" is required.
On the second molecule, we have a simple 4 carbon molecule with a triple bond which makes it an Alkyne. 4 carbons makes the prefix "but-" and a alkyne males the ending "-yne".
the air pressure for a certain tire is 113 KPa. What is the pressure I’m atmosphere
Answer: 1.11 atm
Explanation:
The unit of pressure include kilopascal (kPa), atmospheres (atm), mmHg etc
Now, given that:
Air pressure = 113 KPa
Convert kPa to atm
If 101.325 kPa = 1 atm
113 kPa = Z atm
To get the value of Z, cross multiply
Z atm x 101.325 kPa = 1 atm x 113 kPa
Z = ( 1 atm x 113 kPa) / 101.325 kPa
Z = 1.11 atm
Thus, the pressure is 1.11 atm
What is solubility?
A solution in which no more solute will dissolve
The amount of solute it takes to make a supersaturated solution.
The amount of solute that will dissolve in a given amount of solvent
The amount of solvent it takes to dissolve 100 g of solute
Answer:
C. The amount of solute that will dissolve in a given amount of solvent.
Explanation:
Solubility is the amount of solute that will dissolve in a given amount of solvent. Option 3 is correct.
A solution is a homogeneous mixture of two or more substances, where the substances are uniformly distributed throughout the mixture.
Solubility is defined as the amount of solute that will dissolve in a given amount of solvent at a specific temperature and pressure. It is usually expressed in terms of grams of solute per 100 grams of solvent, or in terms of the concentration of the solute in the solution.Therefore, the amount of solute that will dissolve in a given amount of solvent is referred to as solubility. The correct answer is option 3.
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NEED HELP!!!
Match the following words with their definitions.
1.
number of protons in an atom
neutron
2.
negatively charged particle circling nucleus
nucleus
3.
matter made up of just one type of atom
element
4.
building block of matter
proton
5.
neutrally charged particle nucleus
atomic number
6.
center of the atom made up of protons and neutrons
electron
7.
positively charged particle in the nucleus
atom
Answer:
1.atomic number
2.electron
3.element
4.atom
5.neutron
6.nucleus
7.proton
Explanation:
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The matching exercise pairs terms like 'atomic number' and 'electron' with their correct definitions. The sum of protons and neutrons in an atom's nucleus is the 'mass number,' and the space where electrons are most likely to be found around the nucleus is known as an 'electron shell.'
number of protons in an atom - atomic numbernegatively charged particle circling nucleus - electronmatter made up of just one type of atom - elementbuilding block of matter - atomneutrally charged particle in nucleus - neutroncenter of the atom made up of protons and neutrons - nucleuspositively charged particle in the nucleus - protonNow, to address the descriptions provided
(a) The sum of the number of protons and neutrons in an atom is known as the mass number.
(b) The defined space around an atom's nucleus, where an electron is most likely to be found, is called an electron shell or energy level.
When particles that attract each other are allowed to come to together, energy is ______
Answer:
Released
Explanation:
When particles that attract each other come together, energy is usually released. The combination of the two particles is expected to result in a lower energy system. This lower energy system will be more stable than the different individual particles.
Hence, as this lower energy system is formed, the excess energy originally possessed by the particles is evolved hence energy is released when particles that attract each other are allowed to come together.
what is a cause of cemical weathering?
A. sunlight
B. wind
C. gravity
D. acids
Answer:
D. acids
Explanation:
I hope this helped
Definition: This is an alternative form of a gene.
Answer:
The correct term for the definition is Allele.
Which reasons explain why acids are added to foods? Check all that apply.
Food acids are added to make flavors "sharper", and also act as preservatives and antioxidants.
Acids are added to foods in order to preserving food as well as a food additives.
Why acids are added to foods?Acids are added for preserving food products as well as preventing bacteria growth and maintain quality of a product. there are a number of fruits and vegetables that have different types of acid.
So we can conclude that acids are added to foods in order to preserving food as well as a food additives.
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Elizabeth were studying the history of cell theory and the contributions of different scientist she made this table to compare two of the scientist which part of scientists and Elizabeth right instead of X and Y
Answer:c. Hooke and Leeuwenhoek
Explanation: I ask and that answer was right I don't know the explanation
Answer:
C. hooke and leruwenhoek
What type of reaction is shown? PbO2 --> PbO + O2 *
O
Synthesis
Decomposition
Cationic Single Replacement
ооооооо
O
Anionic Single Replacement
Double Replacement
O
combustion
O
Net lonic
Answer:
single replacement reaction.
At 1.4 atm of pressure a gas has a volume of 111 ML at what pressure will the gas have a volume of 85 ML.
Answer:
The pressure will be 1, 83 atm
Explanation:
We use Boyle Mariotte's formula: for a given mass of gas at constant temperature, the pressure and volume vary inversely proportionally. We convert the unit ml into L: 111/1000= 0,111 L and 85/1000= 0,085 L.
P1xV1=P2xV2
P2= (P1xV1)/V2=(1,4 atm x 0,111L)/0,085L=1,83 atm
CaCl2 + Na2CO3 → CaCO3 + 2 NaCl
1. How many moles of calcium carbonate (CaCO3) are produced when
8.45 moles of calcium chloride react (CaCl2)? *
Answer:
8.45 moles are produced
Explanation:
CaCl₂ + Na₂CO₃ → CaCO₃ + 2 NaCl
From the equation, we can see that for every 1 mole of CaCl₂ and 1 mole Na₂CO₃ will give 1 mole of CaCO₃ and 2 moles of NaCl
to calculate how many moles of CaCO₃ ,we simply multiply multiply each by the 8.45 moles of CaCl₂ which will reacts
these is because for every 1 mole of CaCl₂ and 1 mole Na₂CO₃ will give 1 mole of CaCO₃ and 2 moles of NaCl
therefore we have every 1x8.45(8.45) mole of CaCl₂ and 1x8.45(8.45) mole Na₂CO₃ will give 1x8.45(8.45) mole of CaCO₃ and 2x8.45(16.9) moles of NaCl
8.45 moles are produced in the reaction
Answer:
8.45 moles
Explanation:
The balanced equation for the reaction is given below:
CaCl2 + Na2CO3 → CaCO3 + 2NaCl
From the balanced equation above,
1 mole of calcium chloride (CaCl2) produced 1 mole of calcium carbonate (CaCO3).
Therefore, 8.45 moles of calcium chloride (CaCl2) will also produce 8.45 moles of calcium carbonate (CaCO3)
From the illustration above, 8.45 moles of calcium carbonate (CaCO3) are produced.
Which elements make up a water molecule?
hydrogen and nitrogen
oxygen and nitrogen
oxygen and carbon
hydrogen and oxygen
Answer: it’s d on edunuity. (Hydrogen and oxygen)
Explanation:
americium-241 has a half-life of 430 years. how much of a 10.0g sample of americium-241 remains after 1720 years?
Answer:
(a) What are the half-lives of these two isotopes? (b) Which one decays at a faster rate? (c) How much of a 1.00-mg sample of each isotope remains after 3 half- ...
Explanation:
Calculate the molar mass for HCN.
0.2703 g/mol
2.703 g/mol
27.03 g/mol
270.3 g/mol
Answer:
27.03 g/mol
Explanation:
Molar Mass of HCN
Mass of Hydrogen : 1.008
Mass of Carbon: 12.01
Mass of Nitrogen: 14.01
Molar Mass of HCN =
1.008 + 12.01 + 14.01=
27.03 g/mol