Answer:
c
Explanation:
if you need explanation, ask freely
How are u supposed to tell how many neutrons and electrons an element has?? Pls help if u know the answer.
Answer:
Explanation:
The atomic number (number at the top) is the amount of protons and the amount of electrons. So if an element has an atomic number of 5, you know that it has 5 protons and 5 electrons. The atomic mass (number at the bottom) is the amount of protons and neutrons added together.
when one gram of gasoline burns in a cars engine, the amount of energy given off is approximately 1.03x10^4 cal. express this quantity in joules. use 1 cal= 4.184 j
The amount of energy in joules : 4.31 x 10⁴ J
Further explanationEnergy can be interpreted as the ability to do work
There are several examples of energy , including heat energy
The amount of heat is influenced by the mass of the object and the difference in temperature
Can be formulated
Q = m.c.ΔT
Q: heat received or removed by an object (J)
m: object mass (kg)
c: heat type substance (J / kg⁰C)
ΔT: temperature change (⁰C)
The amount of energy given off is 1.03x10⁴ cal.
Because 1 cal= 4.184 J, then
[tex]\tt =1.03\times 10^4\times 4.184\\\\=\boxed{\bold{4.31\times 10^4~J}}[/tex]
What filters out liquid waste?
stomach
esophagus
kidneys
Answer:
kidneys
Explanation:
Manny designs an experiment to learn about erosion. First, he sets up three long trays with equal-sized piles of sand at one of each tray. Then he sets up Tray A so that it lays flat on a table. He elevates the end of Tray B that holds the sand by 5 cm. Next, he elevates the end of Tray C that holds the sand in each tray. Finally, he observes and measures how far sand is carried by the way water poured into each tray.
Answer:
Height of tray
Explanation:
Put the substance in a 25 mL beaker.
Click the beaker to get a closer look.
Now, observe and record the following:
- state of matter:
- appearance and texture:
- crystalline structure:
Answer:
1.) Liquid
2.) Powder
3.) No ( Not A Solid)
Explanation:
When substance put in a 25 mL beaker. than state of matter will be solid , appearance and texture will be powdered and crystalline structure will be powdered.
What is state of matter?A state of matter was one of many different shapes that matter can take. In daily life, four states of matter were visible: solid, liquid, gas, but also plasma.
What is crystalline structure?
The organized configuration of atoms, ions, and even molecules in such a crystalline material is usually referred to as crystalline structure.
Therefore,
state of matter = solidappearance and texture = powderedcrystalline structure = not solidTo know more about state of matter.
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What element has 80 protons, 81 neutrons, 79 electrons?
Answer:
The element will be [tex]^{161}_{80}X[/tex]
Explanation:
Given that,
Number of proton = 80
Number of neutron = 81
Number of electron = 79
We know that,
The atomic number is equal to the number of proton.
So, the atomic number is 80.
According to atomic number,
The element will be mercury.
We need to calculate the atomic mass
Using formula of atomic mass
[tex]atomic\ mass=atomic\ number+number\ of\ neutron[/tex]
Put the value into the formula
[tex]atomic\ mass=80+81[/tex]
[tex]atomic\ mass=161[/tex]
We need to find the element
Using atomic mass and atomic number
[tex]atomic\ mass\ number A=161[/tex]
[tex]atomic\ number Z=80[/tex]
So, the element will be
[tex]^{A}_{Z}X[/tex]
Put the value of A and Z
Hence, The element will be [tex]^{161}_{80}X[/tex]
Explain the significance of this quote, “Heisenberg may have slept here.”
The quote; “Heisenberg may have slept here.” is used to show a situation that involves uncertainty.
What is the meaning of “Heisenberg may have slept here.”?The quote; “Heisenberg may have slept here.” is used to connote uncertainty. Recall that Heisenberg the German scientist is the famous inventor of the uncertainty principle.
Hence, the quote; “Heisenberg may have slept here.” is used to show a situation that involves uncertainty.
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which of the following pairs would have
a the
larger size
K or k+ ?
Explain your
ur answer.
Answer: Here u go!
Explanation:
In other words, "K"^(+) has bigger effective nuclear charge than "Cl"^(-), which translates to a bigger net positive charge felt by the outermost electrons. This will compress the energy levels a bit and make the ionic radius smaller for the potassium cation. Therefore, the chloride anion will have the larger atomic radius.
Hope this helps ma dude!
I need help ASAP please!
Answer:
The mass is 12.0107 but it rounds up to 12
2. What is the total energy equation?
Total energy = kinetic energy * potential energy
Total energy = kinetic energy - potential energy
Total energy = kinetic energy + potential energy
Total energy = kinetic energy / potential energy
Answer:
Kinetic energy + Potential energy
Li, Rb, F, and I
Which one would have the highest Electronegativity? Why?
Answer:
F
Explanation:
has 7 valence electrons , it really want to hog another electron to reach an octet.
therefore it has a highest electronegativity
which feature is created on the exterior of a volcano when it errupts
Answer: Crater and lava flow
Explanation:
Alveolar air (a mixture of nitrogen, oxygen, and carbon dioxide) has a total pressure of 0.998 atm. If the partial pressure of oxygen gas is 0.198 atm and the partial pressure of nitrogen gas is 0.770 atm, what is the partial pressure of carbon dioxide in millimeters of mercury?
Answer:
22.8 mmHg
Explanation:
According to Dalton's law of partial pressures, the total pressure of a mixture of gases is obtained as the sum of the partial pressures if all the individual gases present in the mixture.
Since the total pressure of gases in the mixture is 0.998 atm, the partial pressure of carbon dioxide is;
PCO2 = [Ptotal - (PO2+ PN2)]
Hence;
PCO2 = [0.998 - (0.198 + 0.770)]
PCO2 = 0.03
Since
1 atm = 760 mmHg
0.03 atm = 0.03 × 760 /1
=22.8 mmHg
how many carbon atoms are in C6H14N4O2
a.4
b.2
c.6
d.14
Answer:
6
Explanation:
Answer:
6
Explanation:
C6
Carbon 6
What is the mass of an object if it produces a 20 N force with a 4m/s/s
acceleration?
Answer:
The answer is 5 kgExplanation:
To find the mass given the force and acceleration we use the formula
[tex]mass = \frac{force}{acceleration} \\ [/tex]
From the question
force = 20 N
acceleration = 4 m/s²
We have
[tex]mass = \frac{20}{4} \\ [/tex]
We have the final answer as
5 kgHope this helps you
23. A 54-gram sample of an unknown material has a volume equal to 20 cm'. Based on its density,
could the sample be aluminum? Explain.
Answer:
The given sample is aluminum.
Explanation:
Given data:
Mass of unknown sample = 54 g
Volume of given sample = 20cm³
Is sample is Al = ?
Solution:
In order to solve this problem we must know the density of Al from literature.
density of Al = 2.7 g/cm³
Now we will calculate the density of given unknown sample.
d = m/v
d = 54 g/ 20cm³
d = 2.7 g/cm³
Thus given sample is aluminum.
Ammonium nitrate (NH4NO3) is a common component of fertilizer because it is a great source of two nitrogen-containing ions that easily dissolve into water. A large batch of this liquid fertilizer is made by adding 2.13 pounds of ammonium nitrate to 26.00 gallons of water. What is the molarity of this solution? (Hint: 1 lb. = 454 g and 1 gal. = 3.79 L.)
Answer:
0.123 M
Explanation:
Molarity, which is molar concentration can be calculated by using the formula;
Molarity = number of moles (n) / Volume (V)
Number of moles of NH4NO3 can be calculated by using;
Mole = mass (M) / Molar mass (MM)
Since atomic mass of N= 14, H=1, O=16
Molar mass of NH4NO3 = 14 + 1(4) + 14 + 16(3)
= 14 + 4 + 14 + 48
= 80g/mol
1 pounds = 454g
2.13 pounds= 2.13 × 454 g
= 967.02g
Hence; mole of NH4NO3 = 967.02/80
= 12.09moles
Molarity of NH4NO3 in water (solution) = number of moles of NH4NO3 ÷ volume of water
1 gallon = 3.79Litres
26gallons = 26 × 3.79 litres
= 98.54 Litres
Therefore, Molarity = 12.09/98.54
Molarity of NH4NO3 solution = 0.1226
= 0.123M or mol/L
Assume that an object has been placed in the pan of a triple beam balance. The
scales of the balance are shown below. What is the mass of the object?
Answer:
190.4 g
Explanation:
To obtain the mass of the object, we must be able to obtain the reading of the triple beam balance.
Thus, the reading of the balance can be obtained by simply adding the various values as indicated by the pointer in each scale.
This can be obtained as follow:
Scale 1 = 90 g
Scale 2 = 100 g
Scale 3 = 0.4 g
Reading of the balance = Scale 1 + Scale 2 + Scale 3
Reading of the balance = 90 + 100 + 0.4
Reading of the balance = 190.4 g
Thus, the mass of the object as indicated by the triple beam balance is 190.4 g.
Please answer this, im too lazy to do the experiment.
1. What happened to the heavier materials in a mixture when left undisturbed?
2. How can we separate liquid and heavier particles in a mixture?
3. What materials are attracted by the magnet?
Explanation:
(1) heavier materials sink to the bottom of the mixture
(2)use a filter funnel and filter paper (filtration method)
(3) ferromagnetic materials (typically metals)
How many neon atoms are in 2.7 moles of neon ?
Answer:
2.7 moles of neon contain 16.3 × 10²³ atoms of neon.
Explanation:
Given data:
Number of moles of neon = 2.7 mol
Number of atoms of neon = ?
Solution:
We will use using Avogadro number to solve given problem.
"It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance"
The number 6.022 × 10²³ is called Avogadro number.
1 mole of neon = 6.022 × 10²³ atoms of neon
2.7 mole of neon × 6.022 × 10²³ atoms of neon / 1 mole of neon
16.3 × 10²³ atoms of neon
Thus, 2.7 moles of neon contain 16.3 × 10²³ atoms of neon.
PLEZ HELP ANSWER. IM STUCK!
d. 3
Explanation:
because the valence electrons on O is 3
The density of pure solid copper is
2.54 g/mL. What is the mass of 250 milliliters of the substance
Answer:
The answer is 508 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 2.54 × 200
We have the final answer as
508 gHope this helps you
One hour of bicycle riding can require 500-900 kcal of energy, depending on the speed, the terrain, and the weight of the racer. An individual wants to lose weight by riding at a modest effort, consuming 505 kcal of energy per hour. How many hours must he ride to lose 21.0 pounds of body fat? One gram of body fat is equivalent to 7.70 kcal of energy. There are 454 g in 1 lb.
Answer:
145 hours
Explanation:
Since one hour of riding a bicycle takes up 505 kcal of energy. It is also stated that one gram of body fat is equal to 7.70 kcal. Also, it is given that 1 pound of body fat is equal to 454 g.
Hence;
1 Ib= 454 g
21 Ib= 21 × 454/1 = 9534 g
But
1g of body fat = 7.70kcal
9534 g of body fat = 9534 × 7.70 kcal/1 = 73411.8 kcal
If 505 kcal is lost in 1 hour
73411.8 kcal is lost in 73411.8 kcal × 1hour/505k cal = 145 hours
what’s the independent and dependent variable?
Answer:
independent variable: a variable (often denoted by x ) whose variation does not depend on that of another.
dependent variable: a variable (often denoted by y ) whose value depends on that of another.
Explanation:
pleas answer this, it’s due tomorrow. I will give brainliest.
Answer:
just the second
Explanation:
Answer:
both are changes in state, and both conserve mass. Hope it helps and please have a good day or night
fog forms when a water vapor changes to the___ state of matter?
Answer:
Gas
Explanation:
1. What are physical and chemical properties of metals, nonmetals, and metalloids?
Earth is approximately 149,600,000 kilometers away from the sun. How would this distance be expressed in scientific notation?
Answer:
bo
Explanation:
I dont know nothing cuz am that smart and yes am cool wait I have to wait 67 seconds am not done answering you questions I will be back in a few....
all matter has ____. A.mass B.weight C.color D.volume btw it is multiple choice. please help
Answer: mass
Explanation:
A given sample of oxygen occupies 500 mL when the pressure is 800 mmHg. What volume will the gas occupy at 200 mmHg, provided the temperature remains constant?
Answer:
The volume of the gas at 200 mmHg will be 2 L.
Explanation:
As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them fewer times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:
"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"
Boyle's law is expressed mathematically as:
P * V = k
Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:
P1 * V1 = P2 * V2
In this case:
P1= 800 mmHgV1= 500 mLP2= 200 mmHgV2= ?Replacing:
800 mmHg* 500 mL= 200 mmHg* V2
Solving:
[tex]V2=\frac{800 mmHg* 500 mL}{200 mmHg}[/tex]
V2= 2,000 mL= 2 L (being 1,000 mL=1 L)
The volume of the gas at 200 mmHg will be 2 L.
