3
Which is visible when an area of the sun's gases are cooler than the surrounding gases?
O sunspots
solar flares
O prominences
O solar winds
Answer:
its sunspots :)
Explanation:
can i pleasee have the brainiest tyty
for my rank
think about the statement "there is no new water on earth" write at least 5 sentences describing how there can be no new water on earth, but the earth doesn't run out of water.
Two scientists made the same observation during an investigation. Since their explanations differed about the observation, they
made additional observations. Why would more observations be helpful for this investigation?
A)
More observations will show both scientists' explanations are not correct.
B)
More observations are needed to show both scientists' explanations are
correct
More observations will prove the scientists' investigation was done
incorrectly.
2)
More observations could help resolve differences in the scientists
explanations.
Answer:
more observations could help resolve differences in the scientists explanations
Explanation:
Making additional observations is crucial when scientists have differing explanations for an observation. More observations provide more data points, increasing the validity of their findings, and can help resolve differences by giving a more comprehensive understanding of the situation.
Explanation:When two scientists make differing explanations about an observation, making more observations is necessary to better understand the event or phenomenon under investigation. Additional observations provide more data points, which add validity to their findings and may lead to a consensus if they consistently show a particular trend. Through additional observations, they can eliminate potential biases or errors that may have occurred in their initial observation. Consequently, more observations might help in resolving differences in the scientists' explanations due to a better, more comprehensive understanding of the observation with varied perspectives.
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How many moles of NaCl are present in 530 ml of a 1.52m NaCl solution
Answer:
805.6 moles
Explanation:
Molarity = 1.52mL
Volume = 530mL
1.52 moles is present in 1mL,
1mL = 0.001L
1.52 moles = 0.001L
X moles = 0.53L
X = (1.52 × 0.53) / 0.001
X = 805.6moles
805.6moles is present in 530mL or 0.52L
Compared with Earth, the Moon has a surface that is geologically less active. For example
A.
both the Moon and the Earth have continents that move around.
B.
the Moon has many active volcanoes, while the Earth has none.
C.
the Moon has no active volcanoes, while the Earth has many.
D.
the Moon has continents that move around, while the Earth does not.
1. What happens when you dissolve acid in water?
a. Positive hydronium ions (H3O+) are released
b. Nothing happens
c. No answer text provided.
d. Negative hydroxide ions (OH-) are released
2. A hydronium ion is like a(n) ______ molecule with an extra hydrogen atom.
a. vinegar
b. water
c. acid
d. base
When you dissolve acid in water positive hydronium ions are released. Therefore, the correct option is option A.
What is acid?Any material that when dissolved in water has an acidic taste, may alter the color of some indicators (such as reddening blue litmus paper), can react with some metals (such as iron) to release hydrogen, can combine with bases to produce salts, and can accelerate some chemical changes (acid catalysis).
Acids are examples of both organic chemicals that belong towards the carboxyl group, sulfonic acid, as well as phenol groups as well as the inorganic substances referred as the mineral acids, such as sulfuric, nitric, hydrochloric, as well as phosphoric acids. When you dissolve acid in water positive hydronium ions are released.
Therefore, the correct option is option A.
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How is calcium essential to your life?
Answer The body also needs calcium for muscles to move and for nerves to carry messages between the brain and every body part. In addition, calcium is used to help blood vessels move blood throughout the body and to help release hormones and enzymes that affect almost every function in the human body
Explanation:
Answer:
Calcium is a mineral for humans which is really important.It helps you be healthy and be in shape(mostly your teeth and your bones).Calcium also keeps your blood and muscles moving and helps your nerves send messages from your brain to the rest of your body.Calcium helps you a lot and is essential to your life.
Hope that was helpful.Thank you!!!
To measure the mass of a vitamin tablet, use: liters (L)
kilograms (kg)
milligrams (mg)
millimeters (mm)
Answer:
mg
Explanation:
Question 14
The average person in one minute exhales 2.5 g of CO2. How many molecules of CO2 are exhaled?
Answer:
.15625
Explanation:
for each gram there is .0625 molecules
A scientist is investigating the effects of electromagnetic radiation on plant growth. She wants to test the plants with two different types of electromagnetic
waves: one with a very long wavelength and one with a very short wavelength. Ideally, the waves will have the greatest possible difference in wavelength.
Which two types of waves should she choose?
To maximize the difference in wavelength for the plant growth experiment, the scientist should use radio waves for the long wavelength and gamma rays for the short wavelength.
The question deals with the investigation of the effects of electromagnetic radiation on plant growth, focusing on the difference in wavelengths of the radiation used. To have the greatest possible difference in wavelength, the scientist should choose radio waves for the very long wavelength and gamma rays for the very short wavelength. Radio waves have the longest wavelengths in the electromagnetic spectrum and carry the least energy, somewhat analogous to making wide waves with a rope using little effort. On the other hand, gamma rays have the shortest wavelengths and carry the most energy, similar to creating short, tight waves in a rope which requires significantly more energy.
Which statement is true about this reaction?
14N+ H-50
It is a practical source of energy on Earth.
It occurs only outside the solar system.
Its product is heavier than each of its reactants.
It shows the critical mass of an element.
Which of the following is best described by the term macroscopic?
A. H₂O
B. Water is composed of two hydrogen atoms and one oxygen atom.
C. Water in the liquid phase boils to become a gas.
D. Water molecules in the solid phase are tightly held together.
Answer:
D
Explanation:
because macroscopic is visible to the naked eye.
How much heat is required to heat 9.61g of ethanol (CH3CH2OH) from 24.10C to 67.30C?
Answer:
a.)
To warm the liquid from 35°C to 78°C:
(2.3 J/g-K) x (42.0 g) x (78 - 35) = 4154 J
To vaporize the liquid at 78°C:
(38.56 kJ/mol) x (42.0 g C2H5OH / 46.06867 g C2H5OH/mol) = 35.154 kJ
Total:
4.154 kJ + 35.154 kJ = 39.3 kJ
b.)
To warm the solid from -155°C to -114°C:
(0.97 J/g-K) x (42.0 g) x (-114°C - (-155°C)) = 1670 J
To melt the solid at -114°C:
(5.02 kJ/mol) x (42.0 g C2H5OH / 46.06867 g C2H5OH/mol) = 4.5766 kJ
To warm the liquid from -114°C to 78°C:
(2.3 J/g-K) x (42.0 g) x (78 - (-114)) = 18547 J
To vaporize the liquid at 78°C:
35.154 kJ (as in part a.)
Total:
1.670 kJ + 4.5766 kJ + 18.547 kJ + 35.154 kJ = 59.9 kJ
Explanation:
1021.27 J heat is required to heat 9.61g of ethanol from 24.1⁰C to 67.3⁰C
What is Specific Heat?The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.
It is given by the formula -
Q = mcΔT
where, Q = amount of heat
m = mass
c = specific heat
ΔT = Change in temperature
Given,
Mass of ethanol = 9.61g
Initial temperature = 24.1⁰C
Final temperature = 67.3⁰C
Q = mcΔ T
= 9.61 × 2.46 × ( 67.3 - 24.1)
= 1021.27 J
Therefore, 1021.27 J heat is required to heat 9.61g of ethanol from 24.1⁰C to 67.3⁰C
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Which statements accurately describe the roles of decomposers in the carbon cycle? Select three options. Decomposers release carbon dioxide into the air as waste. Decomposers remove carbon dioxide from the air during photosynthesis. Decomposers break down the remains of dead plants and animals. Decomposers return carbon compounds to the soil. Decomposers use carbon to make food molecules.
Answer:
1,3,4
Explanation:
just took the test
The three statements that accurately describe the roles of decomposers in the carbon cycle are:
Decomposers release carbon dioxide into the air as waste.Decomposers break down the remains of dead plants and animals. Decomposers return carbon compounds to the soil.DECOMPOSERS:
Decomposers are organisms capable of breaking down dead organic matter. Decomposers include bacteria, fungi etc. Decomposers play a vital role in recycling of nutrients and carbon in the atmosphere. They break down dead organic matter and release the components into the atmosphere.Decomposers perform the following functions as it relates to the carbon cycle:
Decomposers release carbon dioxide into the air as waste.Decomposers break down the remains of dead plants and animals. Decomposers return carbon compounds to the soil.Learn more at: https://brainly.com/question/16599318?referrer=searchResults
The atomic mass of boron is 10.811. What is the mass number of the most
abundant isotope of boron?
A.9
B.12
C.11
D.10
Answer:
C.11
Explanation:
Boron-11 makes up around 80% of all natural Boron. And, typically, the quickest way to determine the most abundant isotope of an element is to just round the atomic mass to the nearest whole number.
What are you doing when you're making sound?
Causing air pressure to drop.
Causing electromagnetic waves to radiate.
Causing photons to travel.
Causing air molecules to vibrate.
Will P and O2 share or transfer electrons?
P + O2 →P4,O10
Answer:
They will share electrons .
Explanation:
When P and O2 reacts, they will share electrons as both of the elements are non-metals.
Only metal elements such as K , Na , Ca , etc. can transfer electrons to the other non-metal elements.
Select all the correct location on the image.
The image shows a model of a nuclear reaction. Which objects could hit other atoms, producing a chain reaction?
All the foursingle neutron /proton in the image coming out of the chain reactions and bombarding are responsible of producing a chain reaction.
What is a nuclear reaction ?
It is the change in the identity or characteristics of an atomic nucleus, induced by bombarding it with an energetic particle.
The bombarding particle may be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion.
In the given image of a nuclear reaction the objects which could hit other atoms, producing a chain reaction are all the four single neutron /proton coming out of the chain reactions and bombarding.
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Answer:
Picture of model of a nuclear reaction attached.
Explanation:
True or False: Newton's first law of motion states that an object at rest will stay at rest, and an object in motion will stay in motion, unless acted on by an unbalanced force?
Answer:
True
Explanation:
On a cold winter day, the heat from inside leaks out of the house, primarily
through the windows.
A. True
B. False
The statement is true. Inside heat tends to escape from a house on a cold winter day, primarily through the poorly insulated parts like windows and doors. The principle of heat transfer, specifically conduction, explains this phenomenon.
Explanation:The statement is True. On a cold winter day, the heat from inside a house tends to move to the colder outside environment, and this flow of heat usually occurs predominantly through the windows and doors if they are not properly insulated. This phenomenon is explained by the principle of heat transfer, specifically the mechanism called conduction, where thermal energy is transferred from a hotter object to a colder one.
Windows, particularly those that are single-pane, are usually not very good insulators, so they can allow a significant amount of heat to escape. This is why in cold climates, it's common to use double-pane or even triple-pane windows, which have air or another insulating material between the panes to reduce heat loss.
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which of the following electromagnetic waves has the highest energy?
a. ultraviolet waves
b. infrared waves
c. microwaves
d. radio waves
The term "electromagnetic" refers to the electrical and magnetic forces and effects that an electric current produces. Ultraviolet waves electromagnetic waves has the highest energy.
What is electromagnetic waves ?The interactions between an electric field as well as a magnetic field produce waves known as electromagnetic waves, or EM waves. In other words, magnetic and electric fields oscillation to produce electromagnetic (EM) waves.
Radio and television waves, microwaves, infrared rays, visible light, ultraviolet light, X-rays, and gamma rays are all examples of electromagnetic waves that propagate across space independently of matter.
An changing magnetic field will cause an altering electric field, and vice versa. Electromagnetic waves are created from these shifting fields. In contrast to mechanical waves, electromagnetic waves may travel without a medium.
Thus, option A is correct.
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THIS IS A SCIENCE QUESTION NOT A CHEMISTRY QUESTION! Why does the same side of the moon always face Earth?
the rotational period of Earth is the same as that of the moon
the rotational period of Earth is equal to one revolution around Earth
the rotational period of the moon is equal to one revolution around Earth
the rotational period of the moon is different than one revolution around Earth
Answer:
I belive it is C. but im not 100% sure.
Explanation:
If the pressure of a gas is 1.0 atm, the volume is 2.0 L and the temperature is 300 k, how many mols (n) of gas are in the container
Answer: The moles of gas are in the container are 0.08
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 1.0 atm
V = Volume of gas = 2.0 L
n = number of moles = ?
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]300K[/tex]
[tex]n=\frac{PV}{RT}[/tex]
[tex]n=\frac{1.0atm\times 2.0L}{0.0821L atm/K mol\times 300K}=0.08moles[/tex]
Thus the moles of gas are in the container are 0.08
A gas is confined to a steel tank with a fixed volume . At 293 K, the gas exerts a pressure of 8.53 atm. After heating the tank , the pressure of the gas increases to 10.4 atm. What is the temperature of the heated gas?
Answer: The temperature of the heated gas is 357 K
Explanation:
To calculate the final temperature of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
where,
[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.
[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.
We are given:
[tex]P_1=8.53atm\\T_1=293K\\P_2=10.4atm\\T_2=?[/tex]
Putting values in above equation, we get:
[tex]\frac{8.53}{293K}=\frac{10.4}{T_2}\\\\T_2=357K[/tex]
Hence, the temperature of the heated gas is 357 K
What type of solution would you have if you dissolved 60g of Na HASO4 in 100g of 60°C water?
Solubility vs. Temperature for a variety of salts
Solubility (g salt/100 g H20)
Naci
- NazHASO4
+ Ba(NO3)2
Naz804
. Ce2(SO4)3•9H20
10 20
Temperature (°C)
30
40
50
60
70
80
90
100
OOOO
saturated
Cannot be determined
unsaturated
supersaturated
The type of solution you have if you dissolved 60g of NaHSO[tex]_4[/tex] in 100g of 60°C water is unsaturated.
What are saturated and unsaturated solution?A solute is dissolved in a solvent to form a solution. We refer to the final mixture as a solution. There is an absolute maximum of solute that can be dissolved in a given solvent at any given pressure and temperature for the solute to stay dissolved inside the solution phase.
Unsaturated solutions have the ability to dissolve more solutes than saturated ones. Since these solutions have not yet reached saturation, a precipitate just at bottom would never be present. From a distance, a solution that is nearly saturated and one that is not would resemble one another. The type of solution you have if you dissolved 60g of NaHSO[tex]_4[/tex] in 100g of 60°C water is unsaturated.
Therefore, the type of solution you have if you dissolved 60g of NaHSO[tex]_4[/tex] in 100g of 60°C water is unsaturated.
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which of the following would form a heterogeneous mixture?
A. A mixture of a solute and a solvent
B. A mixture of polar and non polar liquids
C. A mixture of an electrolyte and water
D. A mixture of two soluble liquids
Answer:
A. A mixture of a solute and a solvent
Explanation:
The composition of the solute dissolved in the solvent to form the solution that is not uniform and same throughout the solution of the mixture is a heterogeneous mixture.
Answer:
B
Explanation:
Like dissolves like. A mixture of polar and no polar liquids wouldn't mix because they are dissimilar. So it would be like water and oil.
Also cuz I just did the quiz and it was right.
What is the relationship between Earth's temperature and the number of sunspots that occur?
Answer:
When there is an increased number of sun spots, it means the surface temperature is decreased which will decrease the temperature of the Earth's surface as well.
Explanation:
Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection. Sunspots usually appear in pairs of opposite magnetic polarity.
Answer:
A i took the test
Explanation:
good luck ;)
What is true of a compound?
It does not always retain the properties of the substances that make it up
It requires electrical energy to make
It requires heat energy to make
It must have water as one of its components
Answer:
It does not always retain the properties of the substances that make it up
Explanation:
Answer:
A/1
Explanation:
Compounds do NOT always retain the properties of the substances that make it up.
Why are prefixes not used in naming ionic compounds?
Answer:
Since we can't utilize charges to make sense of what number of every particle we have (as we did with ionic mixes), we need to determine with prefixes mono-, di-, tri-, tetra, penta-, hexa-,, etc.
D
Question 3
1.25 pts
An increase in temperature in a system causes and
Increase in both entropy and enthalpy.
decrease in both entropy and enthabu
increase in entropy and a decrease in
decrease in entropy and an increase
enthal
Answer:
d
Explanation: