Answer:
More than soap sc um, hard-to-remove scale or film is often due to hard water. Also, take a good look at your faucets or fixtures.
Explanation:
hope this helps :D
6th grade science i mark as brainliest
Which type of wave is this?
Answer:
A Transverse Wave
Experiment: finding absolute zero experimentally
Complete the following analysis and conclusion and submit below.
1. Calculate the Kelvin temperatures of the water and record your answers in the data table.
2. Find the change in the volume of air in the flask from your data and record in data table.
3. Use the equation V 1 / T 1 = V 2 / T 2 to calculate the expected volume of air when cooled in tap water.
4. How do the expected final volume and the actual final volume compare?
5. What is the significance of elevating or lowering the flask until the water level in the flask is even with the water level in the beaker or container?
6. Construct a graph of the data. Plot the volume of the gas at room temperature in tap water and in ice water on the y axis. Plot the Kelvin temperature on the x-axis. Print out graph paper for your plot.
7. Extend the plotted line downward until it crosses the temperature axis. This process of extending a graph beyond the experimental data is called extrapolation.
8. At which temperature is the line predicted to cross the x-axis?
9. At which temperature did the line actually cross the x-axis?
10. Account for any deviation between the predicted temperature line extrapolation and the actual line extrapolation.
11. Real World Chemistry - Explain why bottled gas containers are equipped with a relief valve?
Answer:
When mensuration volume of air within the flask at the primary temperature, a volume of 250mil was recorded, referred to as V1. The temperature of the air within the flask in boiling water was recorded as 99ᵒC, referred to as T2. so as to seek out the right calculations, 99ᵒC must be born-again to Kelvin by adding 273.
the primary temperature in Kelvin is 372K. the worth of V1/T1, may be found by swing 250/372. This involves a complete of zero.67. the quantity of the air within the flask of the second temperature was 177 mil, referred to as V2.
The temperature of the air within the cooled flask is 7ᵒC, referred to as T2. 7ᵒC must be born-again to Kelvin by adding 273 that involves a final total of 280K. the worth of V2/T2, found by swing 177/280 involves a complete of zero.63.
The close to equality in numbers may be attributed to Charles Law. Charles Law states that “as the temperature will increase, thus will the quantity of a gas sample once the pressure is command constant”.
The results of V1/T1 and V2/T2 were terribly on the brink of one another. this can be because of the very fact that this experiment was worn out as a closed system. In Charles Law, if there's a closed system the 2 ratios ought to have equal numbers. {this is|this is often|this may be} why it can be expected for the magnitude relation numbers to be terribly equal.
20POINTS!!!
HELP PLEASE!! This might be an easy question for some!!! WILL LOVE YOU 4EVER!!!
Increasing concentration increases the number of collisions and decreases the reaction rate.
True
False
Answer: False
Explanation: Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate
The sum of the potential energy and the kinetic energy of an object is its thermal energy. True or false?
Answer:
false
Explanation:
Answer:
False.
Explanation:
The sum of potential energy and the kinetic energy of an object is mechanical energy.
Hope that this helps!!! :)
What period has the highest ionization energy?
Answer:helium or the noble gases
Explanation: The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest ionizing energy
James mixed Barium and oxide. what does he get? how does it work?
Answer: Barium Oxide
We know that:
James mixed Ba + O²
Now, let's see what will happen when he does mix it.
The Barium will give it's electrons up to the oxide.
The Oxide and Barium will both reach noble gas status.
In the end, James will get Barium Oxide.
Best of Luck!
Alkaline earth metals are elements present in the second group of the periodic table.
True or false
Answer:
True
Explanation:
Alkaline earth metals are found in the second group on the periodic table. They are made up of elements:
Beryllium
Magnesium
Calcium
Strontium
Barium
Radium
These elements have two valence electrons in their outer most shell. Together with group one elements they are s-block elements.
Group one elements are called Alkali metals. Certain periodic properties trend across the group.Matter and energy may be created or destroyed in a chemical reaction.
Answer:false
Explanation:matter cannot be created or destroyed in a chemical reaction it is rearranged
Define and characterize a suspension, listing similarities and differences to a colloid.
hi help me pls i don't know this
Explanation:
A ammonium B sulphate C nitrate D phosphate
Which equation is balanced? “Hint...count the atoms of each element. Only compare like elements!
Answer:
2Mg + O2 = 2MgO
Explanation:
Al + 3F2 = AlF3 ..... F has 6 on the left and 3 on the right.
Na + F2 = 2NaF ..... Na has 1 on the left and 2 on the right.
2Al + 3O2 = Al2O3 .... O has 6 on the left and 3 on right.
10.8 1.0
Electronegativity difference of Mg and O:
yes
no
Answer:
2.3 / yes
Explanation:
edg 2020
Answer: 2.3 and yes
Explanation:
21.If the anion in an ionic compound is a nonmetal, you must change its ending
-ate
-ite
-ide
Answer:
-ite --> Anionite
Explanation:
Feel free to give brainliest.
Have an awesome day!
What is the frequency of radiation whose wavelength is 2.25 X 10^-5cm?
Answer:
1.25 x 10^15Hz
Explanation:
c = frequency x wavelength
c is the speed of light, which is equal to 3.00 x 10^8 m / s
frequency = c /wavelength
= (3.00 x 10^8m /s) / (2.40 x 10^-5 cm x 1 m /100cm)
= (3.00 x 10^8 m/s) / 2.40 x 10^-7m
= 1.25 x 10^15/s 1 / s = 1Hz
So, the Frequency = 1.25 x 10^15Hz
I hope this helped :)
Substance A is tested to see if it is an acid or a base. A piece of iron is placed
in substance A and the iron starts to wear away over time (corrosive).
Substance A has a sour taste, and will produce a burning/tingling feeling
when touched with a bare hand. Is Substance A an acid or a base?
Answer:
[tex]\huge\boxed{\sf Acid}[/tex]
Explanation:
An acid has the following properties:
=> Is corrosive to Iron and reacts with it.
=> Has a sour taste.
=> Produces a burning sensation when touched.
So, Substance A is an acid.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807A student collected a sample of a gas in a 220 mL gas bulb until is pressure reached 0.757 atm at a temperature of 25.0 . The sample weighed 0.299g. What is the molAR mass of the gas?
Answer:
43.84 g/mol
Explanation:
We use the ideal gas law to find the number of moles of gas present.
So PV = nRT where P = pressure of gass = 0.757 atm, V = volume of gas = 220 mL = 0.22 L, T = temperature of gas = 25 °C = 273 + 25 = 298 K and R = molar gas constant = 0.082 L atm mol⁻¹K⁻¹.
So, n = PV/RT = 0.757 atm × 0.22 L/(0.082 L atm mol⁻¹K⁻¹ × 298 K) = 0.16654 L atm/24.436 L atm mol⁻¹ = 0.00682 mol.
Since mass of gas m = 0.299 g
and n = m/M where M = molar mass of gas
So, M = m/n
\= 0.299 g/0.00682 mol
= 43.84 g/mol
So, the molar mass of the gas is 43.84 g/mol
3.
Which of the following is not true for atoms? (4 points)
They combine to form elements and molecules.
They contain negatively charged electrons.
They are the building blocks of matter.
They are made up of elements.
Answer:
They are made up of elements.
Explanation:
An atom is the smallest particle of matter that still retains the property of the element.
Two or more atoms combine to form elements or compounds. Elements are formed by two or more similar atoms, while compounds are formed by two or more different elements.
Atoms are made up of subatomic particles, protons, electrons and neutrons. Electrons are negatively charged, protons are positively charged while neutrons have no charge.
I hope this help! :)
y’all pls help me with this I’m literally so done
Answer:
Explanation:
I can help you
2. In pigeons, the allele B produces ash-red feathers. The allele b produces
blue feathers. The B allele is dominant to the ballele. A pigeon with
genotype Bb is crossed with a pigeon with genotype bb. What percent of
the offspring are expected to have ash-red feathers?
A. 0%
B. 25%
C. 50%
D. 100%
Answer:
it is C
Explanation:i had this on my test and got it right lol
What happens when the North Pole of one bar magnet is near the south Pole of another bar magnet?
A.Both attraction and repulsion
B.neither attraction nor repulsion
C.attraction
D.repulsion
When the North Pole of one bar magnet is near the South Pole of another bar magnet, they will attract each other. So, the correct option is C, attraction. This is because opposite magnetic poles attract each other, while like magnetic poles repel each other.
What is a magnetic field?A magnetic field is a region in space where a magnetic force can be detected. It is created by the movement of charged particles, such as electrons, protons, and ions. A magnetic field can be produced by a magnet, an electric current, or a changing electric field.
When the North Pole of one bar magnet is near the South Pole of another bar magnet, they will attract each other. This is because the magnetic field lines of the two magnets interact in such a way that they try to align with each other. Since opposite magnetic poles attract each other, the North Pole of one magnet will be attracted to the South Pole of the other magnet.
The magnetic force between the two magnets depends on the strength of the magnetic field and the distance between the magnets. The closer the magnets are, the stronger the magnetic force will be.
Therefore option C, attraction is correct.
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What is a reactant of a chemical reaction?
The reactant of a chemical reaction is one of the two or more substances in a chemical reaction. This image should help:
PLEASE HELP!
Which of the following is an example of a chemical change?
A. A large nail rusting
B. Folding a piece of paper
C. Filling a balloon with hot air
D. Wax melting from a candle
Answer: A. a large nail rusting
Explanation:
Which pair of objects is experiencing the greatest gravitational force
Answer:
Explanation:
Is that the question
Answer:
If it's between human and tennis ball, human and dog, human and building, human and earth.
It would be HUMAN AND EARTH
Explanation:
I took the test and got that.
The principle of conservation of mass is satisfied in a chemical equation when
The law of conservation of mass is also called the law of conservation of matter. When a chemical equation is balanced then it obey the law of conservation of mass.
What is law of conservation of mass?The law of conservation of mass was postulated by the scientist A. Lavoisier. It states that in a chemical reaction, the total mass of the products is equal to the total mass of the reactants.
In a balanced chemical equation, the mass of the reactants and products on either side of the equation will be equal. In other words, matter is neither created nor destroyed in a chemical reaction.
A balanced chemical equation also contains the same number of atoms of reactants and products on both sides. An equation is balanced by adding stoichiometric coefficients to the reactants and products.
Thus it obey the law of conservation of mass.
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Halogens are toxic substances
True or False??
Answer:
true
Explanation:
true its true true
01:48:21
Avogadro’s number was calculated by determining the number of atoms in
12.00 g of carbon-12.
14.00 g of carbon-12.
12.00 g of oxygen.
14.00 g of oxygen.
Answer:
It is 12.00 g of carbon-12.
Explanation:
On yeeeeeeeeeeeee
Before J.J. Thomson began gathering evidence about electrons in 1897, what did scientists know about atoms?
Answer: Scientists generally thought atoms were the smallest particles that could not be broken down any further.
Explanation: Trust me
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Scientists generally thought atoms were the smallest particles that could not be broken down any further.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
Before J.J. Thomson began gathering evidence about electrons in 1897. Scientists generally thought atoms were the smallest particles that could not be broken down any further.
Therefore, Scientists generally thought atoms were the smallest particles that could not be broken down any further.
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I have science and i have a question that says : an element is a (valuable, pure , rare) substance that is not chemically combined with any other elements
Answer:
It’s true ( pure).
Explanation:
An element is defined as a pure substance that is not chemically combined with any other elements. An element comprises of mainly the sane type of atoms.
While a compound is a substance that consists of two or more elements which are chemically combined together. This is the main difference between an element and a compound.
Which would result in the most diverse offspring?
Bees bringing pollen from the flower of one plant to the flower of another plant.
A bacteria cell reproducing through asexual reproduction.
An orchid with a flower structure that can pollinate itself.
Planting a cutting from a potato to grow a new potato plant.
Answer:
B
Explanation:its the best answer
The most diverse offspring is produced when bees bringing pollen from the flower of one plant to the flower of another plant where, the new flower made will show a characteristic of both plants?
What is pollination?Pollination is the process of transferring pollen grains from the anther of the flower to the female stigma portion. This is a mechanism to create offsprings of the plants.
Pollination can be occurred through various agents such as insects, wind, water etc. Some plants contains both male and female flower within it and those are self pollinating.
Bees and butterflies are the main pollinating agents for plants. When they bring the pollen grains from one plant to another plant's flower the resulting offspring will have diverse properties which are mix of each plants.
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