Answer:
I'm pretty sure it is unbalanced
what 2 elements are in the same group?
Sodium and Calcium
Fluorine and Neon
Chlorine and Bromine
Carbon and Aluminum
Answer:
Chlorine and Bromine are in the same group
Answer:
I think fluorine and neon
___________ is a characteristic of a substance that's observed during a chemical reaction. *
physical property
physical change
chemical property
chemical change
How many moles are equal to 89.23 g of calcium nitrate?
Answer:
23
Explanation:
According to the mole concept, there are 0.541 moles which are equal to 89.23 g of calcium nitrate.
What is a mole?A Mole is defined as the unit of amount of substance . Mole is the quantity which is a measure of amount of substance of how many elementary particles are present in a given amount of substance.
Mole is defined as exactly 6.022×10²³ elementary entities. The elementary entity can either be a molecule, atom or an ion depending on the type of substance in which it is present. Amount of elementary entities present in a mole is called as Avogadro's number.
Mole is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For many of the the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound which is measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Number of moles = mass/molar mass= 89.23/164.88=0.541 moles.
Thus, there are 0.541 moles which are equal to 89.23 g of calcium nitrate.
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6th grade science i mark as brainliest
y’all pls help me with this I’m literally so done
Answer:
Explanation:
I can help you
what is the difference between groups and periods on the periodic table.? What do they tell you?
.Answer:
Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.
Explanation:
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
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!
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.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 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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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:
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 :)
All of the following are landforms that can contribute to climate EXCEPT
A. Volcanoes
B. Mountains and shorelines
C. Mountains
D. Iceberg
Which of these is an example of mutualism
Answer:
B.
Explanation:
Mutualism is the idea that both organisms benefit from an interaction. In example B, the honeybee benefits because they receive nectar, while the flower benefits in being pollinated.
A 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
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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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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Here are the energy levels in a fantasy hypothetical hydrogen-like atom. (You cannot use the Rydberg constant, 2.18 x 10-18 J, for this problem, therefore). What is the frequency of a photon that is absorbed when an electron goes from level 2 to level 4? Energyn = 4 -2.10 x 10-19 Jn = 3 -3.20 x 10-19 Jn = 2 - 5.20 x 10-19 Jn = 1 - 9.80 x 10-19 J
Answer:
4.7 x 10^14 Hz
Explanation:
From Bohr's theory, the energy absorbed or emitted (ΔE) by an atom transiting from one energy level to another is given as;
ΔE = E4 - E2
Where;
E4 = energy corresponding to the energy level n=4
E2 = energy corresponding to the level n= 2
ΔE = (-2.10 x 10-19) - ( - 5.20 x 10-19)
ΔE =3.1 x 10-19
But
ΔE = hf
h = Plank's constant
f= frequency of photon absorbed
f = ΔE/h = 3.1 x 10-19/6.6 x 10-34
f = 4.7 x 10^14 Hz
Which type of wave is this?
Answer:
A Transverse Wave
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.
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.
The columns in the periodic table are called
groups/families
O periods
O valence electrons
nucleus
Another source of energy is nuclear energy. Nuclear energy is the energy in the nucleus of an atom. We can release this energy and use it to make electricity. In this project, you will research nuclear energy.
OBJECTIVES
Research nuclear energy and its use for generating electricity.
Directions
Use the library, internet, and other educational resources to research nuclear energy.
Write a three-paragraph report on what you have learned. Be sure to include the uses of nuclear power, how it is generated, and the impact it has on the environment. Also, answer the question, "Is nuclear energy renewable?"
Yes.Nuclear energy is renewable
How do you determine the number of neutrons in the Bohr Model
Answer: There are many ways. (Check Explanation)
Explanation: Electrons are found outside of the nucleus. Now in the middle of the nucleus there are protons in neutrons. The way to determine the number of neutrons in the Bohr Model are many ways.
Number one, if the neutrons, protons, and electrons were color coded, take away the electrons and you are left with the 2. Then find out which color corresponds to the neutron.
If it isn't color coded, then the protons and electrons should usually be marked with either + or - on it. The one without any of this and that is in the nucleus is the neutron. Last but not least, on some of the models, it can show many protons or neutrons are in the nucleus. For example the potassium bohr model. (Check image) On here, 19+ means 19 protons and 20N means 20 neutrons.
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.
Can someone please help me ? Click the picture
Explanation:
Keq =[NO2] ^2 / [N2 O4]
4.64 x 10^-3
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
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! :)