Answer:
A
Explanation:
an element contains only one kind of particle
Write functions of the following parts of the digestive system.
1:Large Intestine
2:Mouth
3:Small Intestine
4:Stomach
Answer:
1. absorb water,get rid of of waste products
2.chewing
3. absorbing nutrients
4. holding the food, breakdown of food
A gas occupies 1.56 L at 1.00 atm. What will be the volume of this gas if the pressure becomes 3.00 atm?
Answer:
0.52 LExplanation:
The new volume of the gas can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{1.56 \times 1}{3} = \frac{1.56}{3} \\ [/tex]
We have the final answer as
0.52 LHope this helps you
4. Write the chemical formulas for the following compounds:
a. lithium oxide (ionic)
b. carbon monoxide (covalent)
C. carbon tetrachloride (covalent)
d. nitrogen trifluoride (covalent)
e. calcium chloride (ionic)
One student rubs a balloon against his hair several times. Another student passes a comb through her hair several times. The students place the comb near the balloon and observe that the comb repels the balloon. Which is the most likely reason the comb is able to repel the balloon?
Answer:
They have like charges
Explanation:
Like charges repel, opposite charges attract
The most likely reason the comb is able to repel the balloon is that, the balloon and the comb have the same electrical charge.
The question is incomplete, the complete question is;
One student rubs a balloon against his hair several times. Another student passes a comb through her hair several times. The students place the comb near the balloon and observe that the comb repels the balloon. Which is the most likely reason the comb is able to repel the balloon?
A.The balloon has a positive charge and the comb is neutral.
B. The balloon and the comb have the same electrical charge.
C. The balloon has a negative charge and the comb is neutral.
D. The balloon and the comb have opposite electrical charges
When the student rubs a balloon against his hair several times or another student passes a comb through her hair several times, static charges are built up on the balloon and the comb.
One of the ways by which a neutral object can be charged is by friction. That is, rubbing it against another object repeatedly.
The fact that when the students place the comb near the balloon and observe that the comb repels the balloon means that both the comb and the balloon acquired the same kind of charge after friction.
Therefore, the balloon and the comb have the same electrical charge.
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Identify the type of chemical reaction that is described.
Answer:
Explanation:
A. Decomposition
B. Synthesis
C. Combustion
D. neutralization
Carbon dioxide contains chemical bonds between oxygen and carbon. What particles are between the carbon and oxygen atoms? What keeps those particles between the atoms?
Explanation: i stuck at this Answer:Sometimes atoms share more than one pair of electrons, for example a double covalent bond can occur, as in the carbon dioxide molecule where carbon shares 2 pairs of electrons with each oxygen atom: O=C=O. (where = represents a double bond). Another kind of covalent bonding is called co-ordinate or dative covalent.
A polar covalent bond exists between the atoms in a CO2 molecule. A carbon atom is joined by four covalent bonds to two oxygen atoms, each of which has two covalent bonds.
What are chemical bonds?A chemical bond is a long-lasting attraction between atoms, ions, or molecules that allows chemical compounds to form.
Ionic bonds are formed by the electrostatic force between oppositely charged ions, whereas covalent bonds are formed by the sharing of electrons.
One carbon atom and two oxygens combine to form the carbon dioxide molecule.
Carbon has only four outer shell electrons, whereas oxygen has six. Double covalent bonds form between the atoms, with two electrons from each atom shared, for a total of four bonding electrons.
A CO2 molecule contains polar covalent bonds between its atoms. Four covalent bonds connect a carbon atom to two oxygen atoms, each of which has two covalent bonds.
Thus, this way bond gets formed between carbon and oxygen atoms.
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Which is evidence that a chemical reaction has occurred?
es
A)
a phase change occurs
B)
a new gas is observed in the form of bubbles
red and yellow paint mixing to make orange paint
D)
the temperature of the substance remains constant
The correct answer is B) a new gas is observed in the form of bubbles .
Answer:
B. a new gas is observed in the form of bubbles
red and yellow paint mixing to make orange paint.
What is the best definition for the freezing point of a substance? *
It is the temperature at which a substance become cold.
It is the temperature at which a substance changes from a gas to a liquid
It is the temperature at which a substance changes from a liquid to a solid.
Answer:
It is the temperature at which a substance changes from a liquid to a solid.
Have a good day!
The temperature at which a substance changes from a liquid to a solid is called its freezing point. Hence, option d is the correct definition of freezing point.
What is freezing point?Freezing point is a physical property of a substance which measures the temperature at which its liquid state converts to solid state where, the two phases are in equilibrium.
For example, water freezes at 0 degree Celsius to form ice. Hence, 0°C is the freezing point of water. The freezing point of substance is affected by the bond type, molecular weight, temperature and pressure as well the impurities if any.
The more the intermolecular forces between the molecules, more easy to convert it into solid. Hence, the freezing point will be lower. If there is any impurities present, the freezing point depression will occurs.
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asap first to get correct get brainleist
Answer: c)winter
HAVE A BLESSED DAY!!!!!
is c4 a compound or and element
Answer:
Element
Explanation:
It's C4 so there are four carbons.
Hope this helped! :))
What is the energy of a wave with a wavelength of 2.25 nm?
The energy of a wave : 8.835.10⁻¹⁷ J
Further explanationThe energy in one photon can be formulated as
E = h. fWhere
h = Planck's constant (6.626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
f = c / λ
c = speed of light
= 3,10⁸ m/s
λ = wavelength
λ = wavelength of a wave = 2.25 nm = 2.25 x 10⁻⁹m
[tex]\tt E=h.\dfrac{c}{\lambda}\\\\E=6.626.10^{-34}\times \dfrac{3.10^8}{2.25.10^{-9}}\\\\E=8.835\times 10^{-17}~J[/tex]
Why is aluminium not produced by the electrolysis of an aqueous solution of aluminium oxide
Answer:
The extraction is done by electrolysis. The ions in the aluminum oxide must be free to move so that electricity can pass through it. Aluminum oxide has a very high melting point (over 2000°C) so it would be expensive to melt it. Aluminum oxide does not dissolve in water, but it does dissolve in molten cryolite.
Explanation:
Identify a minimum of six properties that are unique to water.
State how the structure of a water molecule and its bonds relate to each property.
Answer:
1)Boiling Point and Freezing Point.
2)Surface Tension, Heat of Vaporization, and Vapor Pressure.
3)Viscosity and Cohesion.
4)Solid State.
5)Liquid State.
6)Gas State.
Explanation:
Water molecules are polar, so they form hydrogen bonds. This gives water unique properties, such as a relatively high boiling point, high specific heat, cohesion, adhesion and density.
Answer:
Hey I have the same project do you think you can send it to me please :)
Explanation:
What happens to temperature when the frequency is increased and when the frequency is decreased
Answer:
As the frequency increases, the wavelength decreases. ... (a) For a given sound, as the temperature increases, what happens to the frequency? There is no change in frequency. The speed of sound increases by about 0.5 m/s for each degree Celsius when the air temperature rises.
In an endothermic reaction, the temperature of products is __________ the temperature of reactants
A. Greater than
B. Equal to
C. Less than
is this a balanced equation?
Answer:
C6 H12 O6 +6 O 2 → 6 CO2 + 6 H2 O
Use the reaction given below to solve the problem that follows: Calculate the mass in grams of aluminum metal required to react with 115 g of oxygen
gas
grams Al
4 Al + 3O2 --> 2 Al2O3
**Your answer should be written as XXX
Answer:
4Al + 3O2 --> Al2O3
Step 1; fi
Assuming that the half-life of Isotope Q is 7.5 minutes, what amount of an original
150.0 gram sample of Isotope Q will remain after a half hour?
1. 37.5 g
2. 18.75 g
3. 80 g
4. 9.375 g
I need help with my chemistry homework Here are the problems that I am struggling with. I need this to be answered by 11:59 tonight.
1. How many joules are required to melt 338. grams of ice?
2. How many joules are required to convert 418 grams of boiling water into steam?
3. How many joules are required to convert 150. grams of boiling water into steam?
4. How many joules are required to convert 42.0 grams of boiling water into steam?
5. How many joules are required to heat 422 grams of steam from 110.0 0C to 135.0 0C?
Answer:
1. 111.54 kJ
2. 944.68 kJ
3. 339 kJ
4. 94.92 kJ
5. 21.0578 kJ
Explanation:
1. The heat required to melt a given quantity of ice is known as the latent heat of fusion, [tex]L^{\circ}_F[/tex], of ice
[tex]L^{\circ}_F[/tex], of ice = 330 J/g
The heat required to melt a given mass of ice = Mass of ice, m × latent heat of fusion, [tex]L^{\circ}_F[/tex], of ice
The heat required to melt 338 grams of ice = 338 g × 330 J/g = 111,540 J = 111.54 kJ
2. The latent heat of vaporization, l, of water = 2260 J/g
The heat required to convert, m grams of water to steam at
The heat required to convert 418 grams of boiling water into steam = 418 g × 2260 J/g = 944680 J = 944.68 kJ
3. To convert 150 grams of boiling water to steam, we have;
Heat required = 150 g × 2260 J/g = 339,000 J = 339 kJ
4. To convert 42.0 grams of boiling water to steam, we have;
Heat required = 42.0 g × 2260 J/g = 94,920 J = 94.92 kJ
5. The specific heat capacity of steam is 1.996 J/(g·°C)
The heat, Q, required to raise a given mass, m, of steam by Δt °C is given as follows;
Q = m × c × Δt
The heat required to raise the temperature of 422 grams of steam from 110.0 °C to 135.0 °C is therefore;
Q = 422 g × 1.996 J/(g·°C) × (135.0 °C - 110.0 °C) = 21057.8 J
The heat required to raise the temperature of 422 grams of steam from 110.0 °C to 135.0 °C = 21057.8 J = 21.0578 kJ
refers to the distance from one wave peak to the next wave peak. (Lesson
4.02)
A. frequency
B. wavelength
C. amplitude
D. medium
Answer:
wavelenght
Explanation:
Wavelength can be defined as the distance between two successive crests or troughs of a wave. ... Wavelength is inversely proportional to frequency. This means the longer the wavelength, lower the frequency. In the same manner, shorter the wavelength, higher will be the frequency.
Answer:
The answer is B) Wavelength
Explanation:
Hope this helps:)
Can you guys help please?
Answer:
its false
Explanation:
is this a joke. I honestly don't know why you would need help.
The mass ratio of hydrogen to oxygen in water (formula H20) is 0.126 g hydrogen for every 1 g of oxygen. In another compound of hydrogen and oxygen called hydrogen peroxide, the mass ratio of hydrogen to oxygen is 0.063 g hydrogen for every 1 g of oxygen. What is a possible formula of hydrogen peroxide?
Answer: H2O2
Explanation:
Element XYZ has 3 Isotopes: XYZ-3, XYZ-4, XYZ-5.
XYZ-3 has an abundance of 30%
XYZ-4 has an abundance of 50%
XYZ-5 has an abundance of 20%
The Average Atomic Mass will be closer to:
Use VSEPR theory to predict the bond angles in a molecule of methane (CH4), which is a covalently bonded molecule.
Answer:
109.5 Degrees
Explanation:
Because CH4 is sp4 hybridized (Carbon is bonded to the 4 Hydrogens), the geometry of the molecule must be tetrahedral. Tetrahedral moleculues have bond angles of 109.5 Degrees.
What does unsaturated zone mean?
15. What are the outer electrons of an atom that have to ability to create
chemical bonds? *
Answer:
valence electron
Explanation:
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Which element has 6 valence electrons?
Group 16 elements have 6 valence electrons in the periodic table.
It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
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Which of the following correctly identifies an exception to the order of the periodic table?
A.) Hydrogen is the only Noble Gas found in Group 1
B.) Cobalt is located before Nickel even though it has a higher average atomic mass.
C.) Boron has 8 protons even though its atomic number is 5
D.) Bromine is the only noble gas not found in group 18
Answer:
The exception in the order of the periodic table is;
B.) Cobalt is located before Nickel even though it has a higher average atomic mass
Explanation:
The Russian chemist Dmitri Mendeleev who formulated the periodic law, observed that the arrangement of the atoms in an order of their increasing atomic mass resulted in a table that show a recurring pattern in the properties of the elements within each group
However, cobalt (atomic mass 58.93 amu) which was heavier than nickel (atomic mass 58.71) was placed before nickel due to the similarities of its chemical properties to the group in which it was placed
It was later observed that cobalt with 27 protons was rightly placed to come before nickel that has 28 protons in the periodic table classified by atomic numbers which is the proton number.
Which of the following is a statement of Hess's law?
O A. The enthalpy of reaction is exothermic if all the intermediate steps
are exothermic.
B. The enthalpy of reaction is determined from temperature changes
in the reaction.
C. The enthalpy of reaction does not depend on the steps taken in
the reaction.
O D. The enthalpy of reaction is known only for reactions that are
directly measurable.
Answer:
C
Explanation:
the enthalpy of reaction is independent of the reaction path
The statement with related to the Hess's law should be the enthalpy of reaction that does not based on the reactions.
What is Hess's law?It is also called as the Hess's law of constant that should be heat summation. In the year 1840 here the heat should be absorbed or it should be evolved or there should be changed in the enthalpy with respect to the chemical reaction that contain the fixed quantity.
Therefore, we can conclude that the option c is correct.
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Which of the following is the FIRST step in solving the SI conversion problems?
PLEASE HELP, WILL MARK BRAINLIEST!!!
A) Fill in the "railroad tracks".
B) Write the relationship between the 2 units.
C) Review the SI prefixes.
D) Move decimals around to ensure the answer is in scientific notation.
Answer:
A
Explanation:
Answer:
It is A!
Explanation:
