subtracting atomic number from atomic mass will give the number of
Answer:
:)
Explanation:
If we subtract the atomic number from the atomic mass: atomic mass - atomic number = number of protons + number of neutrons - number of protons. Thus we get the number of neutrons present in an atom when we subtract the atomic number from the atomic mass.
PLEASE ANSWER!! DUE TONIGHT!! 10 POINTS!!
Find the density of a cube (to the nearest tenth) with a side of 4 cm. and a mass of 1235 grams. (You do not need to include units in your answer.)
Answer:
19.3
Explanation:
V=4^3 a^3, to find volume with sides
p= 1235/64, Mass/ Volume= Density
5 points
How many moles are in 3.5 L solution with a concentration of 2.5 M?
O 8.75 moles
O .71 moles
1.4 moles
How many moles of gallium chlorate, Ga(ClO3)3, must react in order to produce 674 kJ of energy according to the following reaction? 2 Ga(ClO3)3 à 2 GaCl3 + 9 O2 DH = - 130.4 kJ
Answer:
10.3 mol Ga(ClO₃)₃
Explanation:
Let's consider the following balanced thermochemical equation.
2 Ga(ClO₃)₃(s) ⇒ 2 GaCl₃(s) + 9 O₂(s) ΔH = - 130.4 kJ
According to the balanced thermochemical equation, 130.4 kJ of heat are released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:
674 kJ × 2 mol Ga(ClO₃)₃/130.4 kJ = 10.3 mol Ga(ClO₃)₃
Thermochemical equations are chemically balanced equations that take into account both the energy change and the physical states of all reactants and products. Energy is a reactant in an endothermic process, whereas it is a product in an exothermic reaction. Here the moles of Ga(ClO₃)₃ is 10.3 mol.
Let's consider the following balanced thermochemical equation.
2Ga(ClO₃)₃(s) ⇒ 2GaCl₃(s) + 9O₂(s) ΔH = - 130.4 kJ
According to the balanced thermochemical equation, 130.4 kJ of heat is released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:
674 kJ × 2 mol Ga(ClO₃)₃ / 130.4 kJ = 10.3 mol Ga(ClO₃)₃
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2.3g of lithium chloride in 500cm3 of solution
Answer:
0.109M
Explanation:
Find molarity of the solution:
Molarity is defined as the ratio between the moles of the solute (Lithium Chloride in this case) per liter of solution. To solve this question we have to find the moles of LiCl and its volume as follows:
Moles LiCl -Molar mass: 42.394g/mol-
2.3g * (1mol / 42.394g) = 0.0543 moles
Volume in liters:
500cm³ * (1L / 1000cm³) = 0.500L
Molarity:
0.0543 moles / 0.500L =
0.109M
If 2.28 g C8H18 reacts with 7.00 g of Oz, predict the mass of CO, that can be produced and
identify the limiting reactant. Explain how you got your answers.
Unbalanced equation: C8H180 + 026) • CO26) + H₂O
Answer:
O₂ is limiting reactant and 6.17g CO₂ can be produced
Explanation:
Based on the balanced reaction:
C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O
1 mole of C₈H₁₈ reacts with 25/2 moles O₂.
To solve this question we must convert the mass of each reactant to moles and, using the balanced reaction, we can find limiting reactant. With moles of limiting reactant we can find the moles of CO₂ and its mass as follows:
Moles C₈H₁₈ -Molar mass: 114.23g/mol-
2.28g * (1mol / 114.23g) = 0.0200 moles C₈H₁₈
Moles O₂ -Molar mass: 32g/mol-
7.00g * (1mol / 32g) = 0.219 moles O₂
For a complete reaction of 0.0200 moles C₈H₁₈ are needed:
0.0200 moles C₈H₁₈ * (25/2moles O₂ / 1mole C₈H₁₈) = 0.250 moles of O₂ are needed.
As there are just 0.219 moles, O₂ is limiting reactant.
Moles of CO₂ that can be produced:
0.219 moles O₂ * (8moles CO₂ / 25/2moles O₂) = 0.140 moles CO₂
The mass is -Molar mass CO₂: 44.01g/mol-:
0.140 moles CO₂ * (44.01g / mol) =
6.17g CO₂ can be producedHow many moles are there in 100g of helium
Explanation:
so for this one u need to remember this equation and use it to find out moles= mass /mr . Mr of helium is 4
so moles= mass /mr
=100/4
=25 moles
hope this make sense:)
a mieral is ______
a. man-made
b. alive
c. non-living
d. a plant
Answer:
C
Explanation:
A mineral is a composition of different rocks, therefore it is not alive and non livine. It is also not man made, but natural
How does increased exhalation of CO2 at the lungs (pulmonary regulation) restore the correct pH range?
Answer:
When CO2 levels become excessive, a condition known as acidosis occurs. This is defined as the pH of the
blood becoming less than 7.35. The body maintains the balance mainly by using bicarbonate ions in the
blood. As the body responds to neutralize this condition, an electrolyte imbalance – an increase of plasma
chloride, potassium, calcium and sodium, can occur.
(This is rly for science but there’s no category for that) Which statement best describes how scientists and engineers work together
in the research and development cycle?
O A. Engineers come up with scientific questions when they are
developing their design, and scientists do research to answer
them.
O B. Scientists test designs made by engineers and then use the
results to improve the designs.
C. Scientists develop a new technology, and then engineers test it by
doing experiments.
D. Engineers make a scientific discovery, and then scientists perform
research to verify it.
Answer:
A. Engineers come up with scientific questions when they are developing their design, and scientists do research to answer them.
What can we do to protect our oceans ?
If the temperature and amount of gas stays constant, what will happen to the pressure of a gas if the volume of the container decreases?
¿Qué estudia la química orgánica?
Answer: el estudio de la síntesis, estructura, reactividad y propiedades del diverso grupo de compuestos químicos construidos principalmente de carbono
Explanation:Hope I helped:)
The greenhouse gas released into the atmosphere as a result of livestock digesting their food is called carbon dioxide
True
False
Answer:
False
Explanation:
Cows and other livestock release methane, which is a gas like Carbon Dioxide, but not the same thing, even though it does contribute into Carbon Dioxide.
If a book has a weight of 23.2 N on Earth, what is its mass?
Answer: Mass is 2,37 kg
Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.
m = W/g = 23.2 N / 9.81 m/s²
Please help im testing and need an answer as soon as possible
Kaya collects the data shown in the table.
A 2-column table with 3 rows. The first column labeled Quantity has entries Voltage, Current, Resistance. The second column labeled Value has entries 6.0 volts, 0.3 Amperes, empty.
What is the resistance in the circuit?
0.05
1.8
5.7
20
Answer:
20
Explanation:
not sure please correct me if im wrong
Answer:
20
Explanation:
Got it right on time 4 learning
TVINN
Assertion: Naphthalene,
camphor, iodine, ammonium
chloride are some common
examples of the substances
which undergo sublimation.
Reason: All solids are first
converted to liquids and then
gases on heating.
Both assertion (A) and
Reason (R) are true
and Reason (R) is the
correct explanation of
assertion (A)
Both assertion (A) and
reason (R) are true but
reason (R) is not the
correct explanation of
assertion (A)
w
Assertion (A) is true
but reason (R) is false.
Assertion (A) is false but reason (R)is true.
Answer:
Assertion (A) is true
but reason (R) is false.
Explanation:
If we look at the assertion closely, it is true that a sublime substance changes from solid to gas without passing through a liquid state. Naphthalene, camphor, iodine and ammonium chloride are some common examples of the substances which undergo sublimation.
However, not all solids first pass through a liquid state before converting to gas. Sublime solids such as those listed above passes directly from solid to gas without passing through a liquid state.
Hence the assertion is true but reason is false.
How does genetic variation make a community more stable? Include explanations of how genetic variation is related to the struggle to survive, differential reproductive success, heredity, natural selection, and evolution
Answer:
If you have genetic variation then a community is more likely to survive because the population is more likely to have individuals who are fine if there are environmental changes. Then natural selection will happen and the species will evolve to he adapted to the new environment. If everyone in a population has the same genetics, than one thing could take them all out.
why does solid silver, Ag, conducts electricity while solid silver chloride, AgCl, does not.
Answer: A solid silver, Ag, conducts electricity because it contains ions or electrons while solid silver chloride, AgCl, does not conduct electricity because AgCl does not dissociate to give ions or electrons.
Explanation:
Solid silver (Ag) is considered to be a good conductor of electricity because there are more number of free electrons or movable atoms are present in it.
As electricity is the flow of ions or electrons. So, more is the number of ions or electrons present in a substance more will be its conductivity.
Whereas solid silver chloride is a precipitate that is insoluble in water and therefore, it will not give ions or electrons.
As a result, silver chloride is not able to conduct electricity.
why do different people have differently shaped proteins?
The sequence of amino acids in the chain determines how the chain will fold up to make the protein, so different proteins have different three-dimensional shapes. ... This is because proteins form attachments and interact with many other molecules and structures inside organisms.
Both Arrhenius and Bronsted-Lowry defintions of an acid are similar. According to both of these definitions, an acid is a compound that -
donates a pair of electrons
contains a nonmetal anion
donates a hydrogen ion
should be labeled as corrosive
Answer:Donates a hydrogen ion
Explanation:
Scientist introducing a gene to the DNA of these fish that cause the fish to glow an example of which application of biotechnology?
A. Artificial selection
B. Genetic Engineering
C. cloning
D. Artificial intelligence
Answer:
The correct answer is B
Explanation:
Genetic engineering is an example of which application of because the genes are changed to get the desired features in an organism.
What is genetic engineering?Genetic engineering is the process in which we alter the genetic makeup of an organism to produce desired characterictics in that organism.
So we can conclude that Genetic engineering is an example of which application of because the genes are changed to get the desired features in an organism.
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DIRECTIONS: Underline the selected word item that best completes the statements.
1. (Climate, Weather) is an overall atmospheric condition of a place of 30 years
and more while (Climate, Weather) is a condition for a short period of time.
2. (Climate, Weather) is influenced by latitude, altitude, ocean current, and
topography.
3. The (higher, lower) the altitude, the (colder, warmer) the climate.
4. (Windward, Leeward) area of the mountain forms precipitation while (Windward,
Leeward) gives dry air and warm weather.
5. Ocean currents bring (cold, warm) water and rain from the equator to the
poles and (cold, warm) water from the poles toward the equator
Explanation:
(Climate, Weather) is an overall atmospheric condition of a place of 30 years and more while (Climate,Weather) is a condition for a short period of time.
2. (Climate, Weather) is influenced by latitude, altitude, ocean current, and topography.
3. The (higher, lower) the altitude, the (colder, warmer) the climate.
4. (Windward, Leeward) area of the mountain forms precipitation while (Windward,Leeward) gives dry air and warm weather.
5. Ocean currents bring (cold, warm) water and rain from the equator to the poles and (cold, warm) water from the poles toward the equator
an organism that lives in or on another organism and causes harm to is a
A. host
B. parasite
C. prey
D. producer
the answer is B. Parasite.
If an atom has 8 electrons and 8 protons and 9 neutrons then what is it's net charge?"
choices:
0
1+
1-
2-
How does the atmospheric pressure at altitudes above sea level compare with atmospheric pressure at sea level?
A. The atmospheric pressure above sea level is higher.
B. The atmospheric pressure at sea level is higher.
c. The pressures are the same.
D. Differences in pressures cannot be determined.
Answer:
Option B
The atmospheric pressure at sea level is higher.
Explanation:
Atmospheric pressure can simply be understood as the weight of the air molecules in the atmosphere. The higher we go up into the atmosphere, the thinner the air becomes. This means that the air present at higher heights is not so much, and hence, the air is lighter. This is why most fighter jets and mountain climbers need oxygen tanks to breathe properly.
Due to the fact that the air is less dense (lighter) at higher altitudes, it also means that the atmospheric pressure at higher altitudes is less.
Therefore, the atmospheric pressure at the sea level is higher than the atmospheric pressure at altitudes above sea level
Answer:
B. The atmospheric pressure at sea level is higher.
Explanation:
Which characteristics do stable ecosystems tend to have
Answer:
Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. Biotic factors include plants, animals, and other organisms. Abiotic factors include rocks, temperature, and humidity. Every factor in an ecosystem depends on every other factor, either directly or indirectly.
What is the pOH of a solution with [OH-] = 1.4 x 10-13?
O A. -13.15
B. 14.00
C. 12.85
D. 13.15
Answer:
C. 12.85
Explanation:
just did
H2O2 is what type of compound?
What is the acceleration of a 7 kg
mass being pulled by a 56 N force?
Answer:
8 meters per second per second
Explanation:
Newton's second law: [tex]f=ma[/tex], force = mass multiplied by acceleration.
Therefore 56 / 7 = acceleration = 8