Explanation:
V is not an SI base unit. (C)
Volume can be expressed as m³ in units.
In turn, m is the SI base units for length.
: How are reefs impacted by disease?
Answer:
The frequency of coral diseases has increased significantly over the last 10 years, causing widespread mortality among reef-building corals. Many scientists believe the increase is related to deteriorating water quality associated with human-made pollutants and increased sea surface temperatures.
Explanation:
Marianne designs an experiment involving electrically charged objects. She wants to know which objects will be attracted to a negatively charged balloon. Identify the test variable, the outcome variable, and the control variable for this experiment.
WILL GIVE BRAINIST
Answer:
When one object is rubbed against another, static electricity can be created. This is because the rubbing creates a negative charge that is carried by electrons. The electrons can build up to produce static electricity. For example, when you shuffle your feet across a carpet, you are creating many surface contacts between your feet and the carpet, allowing electrons to transfer to you, thereby building up a static charge on your skin. When you touch another person or an object, you can suddenly discharge the static as an electrical shock.
Similarly, when you rub a balloon on your head it causes opposite static charges to build up both on your hair and the balloon. Consequently, when you pull the balloon slowly away from your head, you can see these two opposite static charges attracting one another and making your hair stand up.
Materials
• Balloon
• An object made out of wool (such as a sweater, scarf, blanket or ball of yarn)
• Stopwatch
• A wall
• A partner (optional)
Preparation
• Blow up the balloon and tie off the end.
• Have your partner prepare to use the stopwatch.
Procedure
• Hold the balloon in a way that your hand covers as little of its surface area as possible, such as by using only your thumb and pointer finger or by gripping the balloon by its neck where it is tied off.
• Rub the balloon on the woolly object once, in one direction.
• Hold the balloon up on the wall with the side that was rubbed against the wool facing the wall, then release it. Does the balloon stay stuck on the wall? If the balloon stays stuck, have your partner immediately start the stopwatch to time how long the balloon remains bound to the wall. If the balloon does not stick, move to the next step.
• Touch the balloon to a metal object. Why do you think this is important to do?
• Repeat the above process but each time increase the number of times you rub the balloon on the woolly object. Rub the balloon in the same direction each time. (Do not rub the balloon back and forth.)
Observations and results
In general, did the balloon stick to the wall for a longer amount of time as you increased the number of times you rubbed the balloon on the woolly object?
Wool is a conductive material, which means it readily gives away its electrons. Consequently, when you rub a balloon on wool, this causes the electrons to move from the wool to the balloon's surface. The rubbed part of the balloon now has a negative charge. Objects made of rubber, such as the balloon, are electrical insulators, meaning that they resist electric charges flowing through them. This is why only part of the balloon may have a negative charge (where the wool rubbed it) and the rest may remain neutral.
When the balloon has been rubbed enough times to gain a sufficient negative charge, it will be attracted to the wall. Although the wall should normally have a neutral charge, the charges within it can rearrange so that a positively charged area attracts the negatively charged balloon. Because the wall is also an electrical insulator, the charge is not immediately discharged. However, because metal is an electrical conductor, when you rub the balloon against metal the extra electrons in the balloon quickly leave the balloon and move into the metal so the balloon is no longer attracted and does not adhere.
HOPE IT HELPS
PLEASE MARK ME BRAINLIEST
The test variables and the control variable and the outcome variables are Balloons, the electrical insulators, and resist electric charges flowing through them.
What are variables?When we brush a balloon against our head, the hair and balloon both develop opposing static charges. We can see how these two opposing static charges attract one another and make our hair stand up as the balloon is gently dragged away from our head.
When a balloon is rubbed to the wall, it will be attracted to the wall. Because the wall is an electrical insulator, the charge is not quickly discharged.
The excess electrons in the balloon immediately leave the balloon and go into the metal when it is rubbed against metal. As a result, the balloon is no longer attracted to the metal and does not adhere.
Therefore, Balloons, which act as electrical insulators and prevent the flow of electric charges, serve as the test, control, and outcome variables.
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Willie pushed on the cart with 1000 newtons of force. James pulled
on a rope attached
to the cart with 500 newtons of force. Piff pushed on the cart with 400
newtons. What will happen to the cart and why?
Answer:
Sxr
Explanation:
Rtxrcrctvucy
What is the completed balanced reaction for the replacement Al×H2SO4
Answer:
2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)
Explanation:
Let's consider the unbalanced equation for the single replacement reaction between Al and H₂SO₄.
Al(s) + H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)
We will begin balancing S atoms by multiplying H₂SO₄ by 3.
Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)
Then, we balance Al atoms by multiplying Al by 2.
2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)
Finally, we get the balanced equation by multiplying H₂ by 3.
2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)
Which activity is an example of a scientist using creativity?
a scientist exploring evidence from other fields of science to support findings
a scientist transferring data from one experiment into the data analysis from a second experiment
a scientist repeating an older experiment with the latest technology to verify the original findings
a scientist using the latest graphing software to analyze and present the research
A scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.
What is creativity?Creativity is a mental cognitive ability that involves the creation and/or discovery of a hidden process.
In science, creativity refers to the application of mental skills to create new experimental designs and extrapolate findings.
In conclusion, a scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.
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Which type of reaction is always spontaneous?
A. an exothermic reaction that has an increase in disorder
B. an exothermic reaction that has a decrease in disorder
C. an endothermic reaction that has an increase in disorder
D. an endothermic reaction that has a decrease in disorder
Answer:
A.) an exothermic reaction that has an increase in disorder.
Explanation:
got it correct (unit review test)
KOH + _co2 -_ксоз + _Н,0
Answer:
2KOH + 3co2 ------->2ксоз + 2Н20
A silver cube with an edge length of 2.28 cm and a gold cube with an edge length of 2.75 cm are both heated to 82.8 ∘C and placed in 111.5 mL of water at 20.2 ∘C . What is the final temperature of the water when thermal equilibrium is reached?
Solution :
Given :
length of silver cube = 2.28 cm
length of gold cube = 2.75 cm
Initial temperature = 82.8°C
Volume of silver cube is
Volume [tex]$=(\text{edge length})^3$[/tex]
= [tex]$(2.28)^3$[/tex]
[tex]$= 11.8 \ cm^3$[/tex]
mass of silver cube
Mass, [tex]$m_s = \text{density} \times \text{volume} $[/tex]
= 10.5 x 11.8
= 123.9 g
Similarly, the volume of gold cube is
Volume [tex]$=(\text{edge length})^3$[/tex]
= [tex]$(2.75)^3$[/tex]
[tex]$= 20.79 \ cm^3$[/tex]
mass of gold cube
Mass, [tex]$m_g = \text{density} \times \text{volume}$[/tex]
= 19.3 x 20.79
= 401.247 g
Now
heat lost by silver and gold cube = heat gained by water
∴[tex]$m_g .c_g \Delta T + m_s .c_s \Delta T = m_w.c_w \Delta T$[/tex]
[tex]$m_g .c_g (82.8- T) + m_s .c_s (82.8- T) = m_w.c_w (T - 20.2)$[/tex]
[tex]$401.247 \times 0.1264 (82.8- T) + 123.9 \times 0.2386 (82.8- T) = 111.5 \times 4.184 (T - 20.2)$[/tex]
Now solving the equation
[tex]$50.71 (82.8- T) + 29.56 (82.8- T) = 466.51 (T - 20.2)$[/tex]
Final temperature, T = 31.27°C
17.Oxygen gas can be prepared by heating potassium chlorate according to the following equation:
2KClO3(s)2KCl(s) + 3O2(g)
The product gas, O2, is collected over water at a temperature of 25 °C and a pressure of 755 mm Hg. If the wet O2 gas formed occupies a volume of 6.22 L, the number of grams of O2 formed is ________
g. The vapor pressure of water is 23.8 mm Hg at 25 °C.
Mass of O₂ formed = 7.84 g
Further explanationGiven
Reaction
2KClO₃(s) ⇒2KCl(s) + 3O₂(g)
P water = 23.8 mmHg
P tot = 755 mmHg
V = 6.22 L
T = 25 + 273 = 298 K
Required
mass of O₂
Solution
P tot = P O₂ + P water
P O₂ = P tot - P water
P O₂ = 755 - 23.8
P O₂ = 731.2mmHg = 0.962 atm
Moles O₂ :
Ideal gas law :
n = PV/RT
n = 0.962 x 6.22 / 0.082 x 298
n = 0.245
Mass O₂ :
= mol x MW
= 0.245 x 32
= 7.84 g
How can you find the amount of valence electrons an atom of an element contains?
Answer:
For neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.
Explanation:
why is polarity an important factor when determining how molecules interact?
Answer:
Water's polarity allows it to dissolve other polar substances very easily. When a polar substance is put in water, the positive ends of its molecules are attracted to the negative ends of the water molecules, and vice versa.
Explanation:
Answer/Explanation:
When a polar substance is put in water, the positive ends of its molecules are attracted to the negative ends of the water molecules, and vice versa. Because molecular polarity results from the VECTOR sum of the individual bond dipoles. Water's polarity allows it to dissolve other polar substances very easily.
what is the percent composition of (NH4)2S?
if you can, include the problem shown pls
extra.
Mg(NO3)2
please don't just take the points please :(, do the problem
thank you <333
(NH₄)₂S
%N= 41.18%
%H =11.76%
%S=47.06%
Mg(NO₃)₂
%Mg=32.43%
%N=18.92%
%O=(64.86%
Further explanationGiven
(NH₄)₂S
Mg(NO₃)₂
Required
The percent composition
Solution
(NH₄)₂S MW=68 g/mol
%N=2. Ar N / MW (NH₄)₂S x 100%
%N= (2.14/68) x 100% = 41.18%
%H =(8.1/68) x 100%=11.76%
%S=(32/68)x 100%=47.06%
Mg(NO₃)₂ MW=148 g/mol
%Mg=(2.24/148)x100%=32.43%
%N=(2.14/148)x100%=18.92%
%O=(6.16/148)x100%=64.86%
Please help me.
Thank you!
Answer: Positive
Explanation: Just a guess
Answer:
Positive
Explanation:
A 10 wheeler truck collides with a car. Who is more likely to be hurt: the driver of the car or the driver of the truck? please justify your answer.
THANK YOU ت︎
Answer:
The driver in the car because a truck is a bigger vehicle and the impact of a truck to a car is more damaging than a car to a truck. Weight difference is the key I think.
Explanation:
16.A mixture of carbon dioxide and hydrogen gases contains carbon dioxide at a partial pressure of 217 mm Hg and hydrogen at a partial pressure of 703 mm Hg. What is the mole fraction of each gas in the mixture?
XCO2 =
XH2 =
x CO₂ = 0.236
x H₂ = 0.764
Further explanationGiven
P CO₂ = 217 mmHg
P H₂ = 703 mmHg
Required
The mole fraction
Solution
Dalton's law :
The total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
Can be formulated:
P tot = P1 + P2 + P3 ....
P tot for the mixture :
= 217 mmHg + 703 mmHg
= 920 mmHg
Mole fraction of each gas :
x CO₂ = 217 mmHg/920 mmHg = 0.236
x H₂ = 703 mmHg/920 mmHg = 0.764
The specific branch of chemistry that focuses on molecules such as salts and water that constitute non-living matter, but are still important to living things, is termed
Answer: Inorganic chemistry
Explanation:
Inorganic chemistry can be defined as the branch of chemistry which studies the behavior of the inorganic compounds. Inorganic compounds are those compounds which lack carbon hydrogen bonding. The carbon monoxide, carbon dioxide, sodium chloride and water are the examples of inorganic compounds. This branch also studies the effect of these chemical compounds on the living things. The water and salts are chemicals which regulate the chemical and physiological reactions in the body.
what is the experiment to find the concentration
A titration is an experiment where a volume of a solution of known concentration is added to a volume of another solution in order to determine its concentration. Many titrations are acid-base neutralization reactions, though other types of titrations can also be performed.Aug 12,
2. All elements are composed of extremely small particles called
Answer:
Atoms
Explanation:
Toxic chemicals in drinking water usually are reported and a safety level specified in units of parts per million (ppm) by mass. What is the molar concentration of arsenic in a water sample that has 1 ppm arsenic (As)
Answer:
The molar concentration of water sample that has 1 ppm arsenic is 1.33 * 10⁻⁵ M
Explanation:
1 parts per million (ppm) means 1 part of solute in a million parts of solution.
Since 1 million, 10⁶ mg = 1 kg, 1 ppm = 1 mg/kg
The density of water = 1.0 kg/L, therefore, the volume of 1 kg of water = 1 L
Hence, 1 ppm = 1 mg/kg = 1 mg/L
molar mass of arsenic = 75 g/mol
1 mg of arsenic = 10⁻³ g or 0.001 g
number of moles of arsenic in 0.001 g of arsenic = 0.001 g / 75 g/mol = 1.33 * 10⁻⁵ moles
Molar concentration = 1.33 * 10⁻⁵ mol / 1 L = 1.33 * 10⁻⁵ M
Therefore, the molar concentration of water sample that has 1 ppm arsenic is 1.33 * 10⁻⁵ M
what is the percent chance that the offspring will be dwarf plants with yellow fruit
Answer:
Yellow fruit and dwarf vines are recessive traits in tomatoes. Red fruit and tall vines are dominant. Complete a Punnett square and answer the questions for a completely dominant red and tall plant crossed with a heterozygous red and dwarf plant.
Explanation:
1.When acids react with carbonates,------------gas is liberated.
Answer:When acids react with carbonates,---CO2--------gas is liberated.
Explanation:
Acids liberate Carbon IV oxide when they react with Carbonates bicarbonate
For examples
Acid +carbonate ⟶ Salt + Water + Carbon dioxide
Calcium carbonate + Hydrochloric acid will give Calcium chloride with the liberation of CO2 gas and water
CaCO3 + 2HCl →CaCl2 + CO2 + H2O
To Test for the presence of the CO2 Liberated, we pass the gas through lime water, if the lime water turns milky, then C02 gas is confirmed.
Base your answer on the information below. The hydrocarbon 2-methylpropane reacts with iodine as represented by the balanced equation below. At standard pressure, the boiling point of 2-methylpropane is lower than the boiling point of 2-iodo-2-methylpropane. Explain the difference in the boiling points of 2-methylpropane and 2-iodo-2-methylpropane in terms of both molecular polarity and intermolecular forces.
Answer:
See explanation
Explanation:
The boiling point of a substance is affected by the nature of bonding in the molecule as well as the nature of intermolecular forces between molecules of the substance.
2-methylpropane has only pure covalent and nonpolar C-C and C-H bonds. As a result of this, the molecule is nonpolar and the only intermolecular forces present are weak dispersion forces. Therefore, 2-methylpropane has a very low boiling point.
As for 2-iodo-2-methylpropane, there is a polar C-I bond. This now implies that the intermolecular forces present are both dispersion forces and dipole interaction. As a result of the presence of stronger dipole interaction between 2-iodo-2-methylpropane molecules, the compound has a higher boiling point than 2-methylpropane.
What group number is Plutonium in and how do you know?
Answer:Actinide Group
Explanation:Plutonium is a member of the actinide group in the periodic table. Plutonium atoms have 94 electrons and 94 protons with 2 valence electrons in the outer shell. There are 150 neutrons in the most abundant isotope.
what type of reaction is Au2S+H2---> 2Au+H2S
Answer:
single replacement reaction is type of reaction is Au2S+H2---> 2Au+H2S.
HELP!!!
How many grams of tomatoes are equivalent to 1.30 pounds of tomatoes? (1 lb = 453.6 g)
If you can please show me how you solved it. Please and Thank you
Answer: with dog figs- it is 590
With decimals it is 589.68
Explanation:
A rigid vessel contains 2.5 mol of H2(g). How many grams of hydrogen are in the vessel.
Answer:
5 g of H₂ are contained in the vessel
Explanation:
A typical excersise of conversion:
We determine molar mass of H₂.
This is a dyatomic molecule, as molar mass of H is 1g/mol, molar mass of H₂ will be 2g/mol.
Let's make the conversion of units:
2.5 mol . 2g/mol = 5 g
5 g of H₂ are contained in the vessel
Mass of hydrogen in the vessel = 5 grams
Number of moles:The number of moles is defined as the given mass over molar mass.
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Given:
Number of moles= 2.5 mol
To find:
Mass of hydrogen=?
Molar mass of hydrogen =2g/mol
On substituting the values in the given formula we will get:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}=2.5 mol* 2g/mol\\\\\text{Given mass}=5 g[/tex]
Thus, mass of hydrogen in the vessel is 5 grams.
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animal and Plant Cells Worksheet Word
Answer:
u didnt give a worksheet
Explanation:
16. Put the following pairs in order from least polar to most polar:
a. C-H N-H H-O H-F
b. C-H
C-S
H-F
C-N
C-O
H-Br
i.
Which pair in part b has the most electronegative bond? Least electronegative bond?
17. Explain how you could use the electronegativity scale to determine the direction and degree of
polarity between two atoms. (Direction meaning which way does the dipole arrow point)
Answer:
I think A does because there are so many letters in their so a
What is the product of the unbalanced combustion reaction below?
Answer: A
Explanation:
Answer:
C
Explanation:
because the combustion reaction produce vapor water and CO2
What is one effect of the Gulf Stream
Answer:
This strong current of warm water influences the climate of the east coast of Florida, keeping temperatures there warmer in the winter and cooler in the summer than the other southeastern states. Since the Gulf Stream also extends toward Europe, it warms western European countries as well.
Answer:
warm climates in northern Europe
Explanation:
I took the test in K12 and this was the answer :)