Answer:
The temperature of a gas at STP is 273K
Choose the chemical equation that is correctly balanced.
Answer:
their is nothing their btw just letting you know
As you move from left to right across the second period of the periodic table
A. Ionization energy increases
B. Atomic mass decreases
C. Electronegativity decreases
D. Atomic radii increase
Answer:
A. ionizing energy increases
A tabular form in which the chemical elements are positioned according to the chemical and physical attributes is called the periodic table. The horizontal rows from left to right is referred as periods in the table.
The correct option is:
Option A. Ionization energy increases
This can be explained as:
The ionization energy raises from left to right because of valence shell resilience.The nuclear charge on the atom expands and protons in the nucleus lure the electrons more strongly.Therefore due to the high proton number, the ionization increases across the period.
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A hockey player is wearing ice skates and pushes against the wall propelling her backward on the ice. According to Newton's third law of motion, which of the following best compares the forces acting between the wall and the hockey player?
A.
The forces are equal and applied in the same direction.
B.
The forces are different sizes and applied in the opposite direction.
C.
The forces are equal and applied against gravity.
D.
The forces are equal and applied in the opposite direction.
its D
random characters AAAJIJRIAJKLGIJHEOGEINDKIKAN
What are the coefficients when the equation below is balanced?
Answer:
1, 2, 2, 1
Explanation:
This is basically the equation we're trying to balance:
Cu + AgNO₃ → Ag + Cu(NO₃)₂
We start with Copper (Cu): There is 1 atom on the reactants'(left) side and 1 atom on the products'(right) side which means it's balanced
The second is Silver (Ag): There is 1 atom on the reactants' side and 1 atom on the products' side which means it's balanced
The third is Nitrogen (N) and there is 1 atom on the reactants' side and 2 atoms on the products' side. We balance it by multiplying the reactants' side by 2
Cu + 2AgNO₃ → Ag + Cu(NO₃)₂
Silver is now imbalanced so we multiply the silver atoms on the product's side by 2
Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂
If you count them now, the atoms on each side are the same number
1 Copper atom on each side
2 Silver atoms on each side
2 Nitrogen atoms on each side
6 Oxygen atoms on each side (2 sets of 3 oxygen atoms)
1Cu + 2AgNO₃ → 2Ag + 1Cu(NO₃)₂
Ajay bought bottle that was labelled as distilled water. He suspected it to be tap water. What test he could use without adding any chemical in it to find out for sure?
Answer:
Ajay should pass electric current through the water and connect a bulb to the circuit. If the bulb glows, it means that the water is tap water or else, it is distilled water.
Explanation:
This is because tap water contains little impurities like ions of some salts etc., which help in the conduction of electricity. But, distilled water is pure water and doesn't have any ions present in it. So, it doesn't conduct electricity.
Hope this helped
Ajay can test the distilled water by performing the electricity conduction test.
Distilled water has been the water that has an absence of ions and electrolytes. It has been a poor conductor of electricity.
The tap water has been constituted with minerals, electrolytes, and impurities, which results in the addition of conductivity to the water.
To test whether the water has been distilled or not, the circuit test can be performed The water has dipped wires connected with a battery and a bulb. the distilled water is a poor conductor did not allow the bulb to glow. However, with tap water bulb glow.
Thus, to test the water to be distilled or tap, the electricity conduction test has been performed.
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If an unknown solution has a pH of 9, what is that solution classified as?
A.Solid
B.Neutral
C.acid
D.Base
Answer:
option A is the ans i think so
If an unknown solution has pH of 9 the solution is classified as a base as it has larger concentration of hydroxyl ions.
What is base?
According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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How many moles are contained in 5.0 g of SO2:
Hey there!
Molar mass SO₂ = 64.066 g/mol
Therefore:
1 mole SO₂ -------------------- 64.066 g
(moles SO₂ ) ??---------------- 5.0 g
( moles SO₂) = 5.0 * 1 / 64.066
(moles SO₂) = 5.0 / 64.066
moles = 0.0780 moles of SO₂
Hope this helps!
what is the half life of the element in the picture
HELP BRAINLIEST
Answer:
6 days
Explanation:
The following data were obtained from the question:
Original amount (N₀) = 100 mg
Amount remaining (N) = 6. 25 mg
Time (t) = 24 days
Half life (t½) =?
Next, we shall determine the decay constant. This can be obtained as follow:
Original amount (N₀) = 100 mg
Amount remaining (N) = 6. 25 mg
Time (t) = 24 days
Decay constant (K) =?
Log (N₀/N) = kt / 2.303
Log (100/6.25) = k × 24 / 2.303
Log 16 = k × 24 / 2.303
1.2041 = k × 24 / 2.303
Cross multiply
k × 24 = 1.2041 × 2.303
Divide both side by 24
K = (1.2041 × 2.303) / 24
K = 0.1155 /day
Finally, we shall determine the half-life of the isotope as follow:
Decay constant (K) = 0.1155 /day
Half life (t½) =?
t½ = 0.693 / K
t½ = 0.693 / 0.1155
t½ = 6 days
Therefore, the half-life of the isotope is 6 days
asap first to get correct get brainleist
Answer: c)winter
HAVE A BLESSED DAY!!!!!
Which shows the correct order of steps when using wind to generate electricity?
wind turbine blades turn generator → generator changes kinetic energy to electricity → kinetic energy from wind turns blades on wind turbine
kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity
kinetic energy from wind turns blades on wind turbine → generator changes kinetic energy to electricity → wind turbine blades turn generator
wind turbine blades turn generator → kinetic energy from wind turns blades on wind turbine → generator changes kinetic energy to electricity
Answer:
B.) kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity
Explanation:
correct on edge
just took the quiz
The correct order of steps when using wind to generate electricity is kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity. Therefore, option B is correct.
What do you mean by the kinetic energy ?The energy an item has as a result of motion is known as kinetic energy. A force must be applied to an item in order to accelerate it. We must put forth effort in order to apply a force.
Kinetic energy has the following formula: K.E. = 1/2 mv², where m is the object's mass and v is its square velocity.
The kinetic energy is measured in kilograms-meters squared per second squared if the mass is measured in kilogrammes and the velocity is measured in metres per second.
The steps when using wind to generate electricity is kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity.
Thus, option B is correct.
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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
A Rottweiler dog is born with a long tail and when it is a few days old its tail is cut to be shorter. Several years later, the dog has eight puppies. Based on this information, how many puppies would you expect to have short tails like their mother's? A. 4 B. 8 C. 0 D. 2
Answer:
I think it's A or D
Explanation:
apologies if I get this wrong..
Answer:c.0
Explanation: hopefully this isn’t wrong, but wouldn’t it be 0 since it was something the mother did later on so it really wasn’t a trait of her? And also the mother didn’t born with a short tail?
I will give brainliest to answer this question right.
Which substance plays a major role in the eutrophication process?
A. ozone
B. salt
C. iron
D.phosphorus
Answer:
The substance is phosphorus or D!
Hope this helps!
How many neutrons does the isotope Nn have
Answer:
N have 8 13 neutrons.
Explanation:
Nitrogen-15 Nitrogen-20
8 13
what is this equation? How do you use it in physical science waves
Answer:
hmm
Explanation:
let me think
Answer:
speed of sound, frequency and wavelength
How do isotopes affect the average atomic mass of an element?
Answer:
The versions of an element with different neutrons have different masses and are called isotopes. The average atomic mass for an element is calculated by summing the masses of the element's isotopes, each multiplied by its natural abundance on Earth.
Explanation:
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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Please help meeeee!!
y’all wanna explain what a water table is?
Answer:
the level below which the ground is saturated with water.
Explanation:
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]
Jose times how long sugar takes to dissolve in warm water. He conducts four trials of his experiment. What should he conclude from his data?
Trial Time
1 30 seconds
2 32 seconds
3 10 seconds
4 29 seconds
Sugar does not dissolve in water.
The time recorded for Trial 3 may be inaccurate.
His experiment has very low precision.
Answer:
His experiment has very low precision
Explanation:
Precision is how close the answers are together. The answers are increasing in time. So, this makes sence. None of the answers are similar to one another.
PLEASE HELP WILL GIVE BRAINLY IF UR CORRECT
Answer:
eon,era,period,epoch,and age
WILL GIVE BRAINLYEST and 20 points!!!!!!!
explain that atoms of elements combine to make compounds
explain why there are many, but limited, combinations of elements to make compounds
demonstrate with atomic models how atoms can combine in many ways
Answer:
Explanation:
Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions.
Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid. Hydrogen and oxygen, on the other hand, cannot be decomposed into simpler substances. They are therefore the elementary, or simplest, chemical substances - elements.
Each element is represented by a unique symbol. The notation for each element can be found on the periodic table of elements.
The elements can be divided into three categories that have characteristic properties: metals, nonmetals, and semimetals. Most elements are metals, which are found on the left and toward the bottom of the periodic table. A handful of nonmetals are clustered in the upper right corner of the periodic table. The semimetals can be found along the dividing line between the metals and the nonmetals.
Answer:
give him brainlyest my gye
Explanation:
Where would we find yellow bone marrow?
Answer:
Yellow bone marrow can be found in the long bones of the human body one such bone being the femur the yellow bone marrow contains certain stem cells which produce cartilage, fat and bone.
Explanation:
Answer:
Yellow bone marrow can be found within the medullary cavity. You see, the anatomy of a compact bone consists of blood vessels, cartilage, red bone marrow, etc. Within the bone there is spongy bone which holds the medullary cavity, and within this cavity there is yellow bone marrow.
Is food coloring and water a compound?
AI a =m not suresedfdssssssssssss
PLS PLS SOMEONE HELP ME ANSWER THESE QUESTIONS PLEEEAAASSSE!!
(press on the picture so you can see the questions better!)
Answer:
1)conduction
2) convection
3) conduction
4) radiation
5) radiation
6) radiation
7) conduction
8) conduction
9) radiation
10) convection
Explanation:
not 100% sure
what is the difference between fermentation and alcohol
Answer:
Unlike lactic acid fermentation where-in the end product is lactic acid, the 'waste' material in an alcohol respiration is ethanol (an alcohol) and CO2 (carbon dioxide). Human beings have already perfected the use of this process for commercial purposes like in the production of beer, wine and bread
Explanation:
In alcoholic fermentation, pyruvate changes to alcohol and carbon dioxide. This type of fermentation is carried out by yeasts and some bacteria.
Which diagram best represents reciprocal disclosure?
Answer:I think its B
Explanation:
Answer:
B
Explanation:
it is B becuse my teacher told me it is
A certain area receives a large amount of rain and some of it remained on top of the soil. What happened to the rest of the water
The terms distance and displacement are used by scientists to describe very specific differences between an object's initial position and its final position. Describe a situation in which the distance traveled is great but the displacement is zero.
Explanation:
Distance is the total length of path one travels.
Displacement is the distance between the initial and final position.
For example, if your classroom is located 200m from your dormitory, you walk to class and back to your dormitory, your distance is 200m + 200m = 400m;
Your displacement is 0m. Your initial and final position is the same so no displacement.