Answer: 98.08 g/mol
:))))))))
Scientists digging in a cave found an unknown substance. The scientists
found that the substance’s molecules were moving around each other. The scientists
increased the speed of the substance’s molecules and caused a phase change. How
did the scientists do this, and how did this affect the substance?
Answer:
By adding heat energy
It changed to gas
Explanation:
A substance whose molecules are moving around each other is a liquid. They are held in shape by very weak intermolecular forces.
For solids, there is no movement because the molecules are held up in a fixed lattice.
Gases molecules moves randomly and independently of one another.
When a liquid is heated and it gains heat energy, it changes phase. A phase change to gas can be predicted. This is because there is an increase in the speed of the substances.Which is classified as nonpolar covalent?
1) hydrogen and iodine
2) carbon and sulfur
3) hydrogen and chlorine
4) nitrogen and hydrogen
Answer:
3 i think...............
Answer:
3
Explanation:
What is the difference between the groups (vertical columns) and periods (horizontal rows) on the periodic table?
Answer:
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods
When combined in the correct ratio hydrogen and oxygen atoms can form water as shown below
Answer:molecule of a compound
Explanation:
Explain why Mercury has a shorter year then earth HURRY IM IN CLASS!!!!!!!!!!
Answer:
Explanation:
This small planet spins around slowly compared to Earth, so one day lasts a long time. Mercury takes 59 Earth days to make one full rotation. A year on Mercury goes by fast. Because it's the closest planet to the sun, it doesn't take very long to go all the way around.
Which of these is an example of a homogeneous mixture
A- Distilled water
B- A bar of pure gold
C- A solution of salt water
D- Carbon dioxide
Answer:
C- A solution of salt water
Explanation:
You cannot see the salt within the water, for it has already dissolved. The contents are uniformly distributed throughout the water's volume.
I hope this made sense! (^-^)
When the equation
Cu + AgNO3 → Cu(NO3)2 + Ag
is balanced, the coefficient of copper (II) nitrate is
A. 0.
B. 3.
C. 1
An equation which follow the law of conservation of mass is called the balanced equation. The coefficient of copper (II) nitrate is 1 .The correct option is C.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation.
The coefficients are the numbers which are used to balance the chemical equation. They are added in front of the formulas. According to law of conservation of matter, mass can neither be formed nor be destroyed.
The balanced equation for the given reaction is:
Cu (s) + 2AgNO₃ (aq) → Cu (NO₃)₂ (aq) + 2Ag (s)
Here the coefficient of Cu (NO₃)₂ is 1. The number of 'Cu', 'Ag', 'N' and 'O' atoms are equal. So the given equation is balanced. The coefficient of AgNO₃ is 2, and 'Ag' is 2.
Thus the correct option is C.
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Which statement describes an advantage of asexual reproduction?
O Asexual reproduction results in variations in DNA.
o Asexual reproduction causes less competition for resources.
o Asexual reproduction is faster tha sexual reproduction.
O Asexual reproduction requires more energy than sexual reproduction.
Activity
Asexual reproduction is faster tha sexual reproduction.
In asexual reproduction there is mitosis. There is prophase, metaphase, anaphase, and telphase. In sexual reproduction there is meiosis. Meiosis does have prophase, metaphase, anaphase, and telophase. But it has two stages of that. So it also has prophase 2, metaphase 2, anaphase 2, and telophase 2,
Explanation:
Which of the following best describes a vacuum
Answer:
it sucks up stuff,cleans around the house,and can be emptied
Explanation:
because its what it is spose to do
Answer:
a space entirely devoid of matter.
Explanation:
is drawing on paper a chemical or physical change
Answer:5
Explanation:
Answer:
physical change
Explanation:
Barbara completed an assignment for extra credit in science class. She used a pH meter to find the pH of different substances.
After she finished measuring the pHs, she created a diagram that showed the substances arranged in order from the most acidic to the most basic.
If Barbara added lemon juice—pH 2.2—to her investigation, where should it appear in her diagram?
A.
between milk and water
B.
to the left of cola
C.
between soap and bleach
D.
between water and blood
Answer:
if ur here for the coffee one its between cola and acid rain
Explanation:
ur mom
What happens when the two negative ions are brought close together?
They attract each other to form ionic networks.
Which of these is a compound?
potassium
salt water
carbon dioxide
salad
Answer:
I think it's potassium.
Explanation:
N/A.
what type of reaction is being produced for the formula C3H8
Answer:
The balanced chemical equation for the combustion of propane is: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g).
Explanation:
Answer:
chemical reaction if that is answer
Explanation:
What needs to happen for a chemical change to happen?
difference between calcium sulfide and calcium sulfate.
Answer: Calcium sulfide is a chemical compound having formula CaS. While Calcium sulfide is inorganic compound g fomlaCaSO4.
Explanation:
calcium sulfide is use in preparation of hydrogen sulfide, luminous pain and as a depilatory in cosmetics while calcium sulfate is used as desiccant. calcium sulfides is white material crystallizes in cubes like rock salt while calcium sulfate has three different crystalized forms known as hemihydrate (CaSO4⋅12H2O) , anhydrate (CaSO4) and as gypsum (CaSO4⋅2H2O). hope this explanation will be helpful for you
When solid magnesium burns, it reacts with oxygen in the air to form a powder called magnesium oxide. A chemist performed this reaction in a lab and found that the mass of the magnesium oxide was greater than the mass of the magnesium. What is the reason behind this increase in mass?
Answer:
magnesium oxide is greater than the mass of the magnesium.
How many moles of carbon atoms are present
in 5.4 moles of glucose?
Answer in units of mol.
Answer:
32.4 mol
Explanation:
Given data:
Number of moles of C atom present = ?
Number of moles of glucose = 5.4 mol
Solution:
Glucose formula = C₆H₁₂O₆
There are 6 moles of C atoms are present in one mole of glucose.
In 5.4 moles of glucose:
5.4 mol × 6 = 32.4 mol
Is this equation completely balanced?
2C8H8 + 25O2 = 8CO2 + 18H2O
A. No, because the number of carbon, hydrogen & oxygen atoms on both sides of the equation are not equal.
B. No, because the number of oxygen atoms on both sides of the equation are not equal.
C. Yes, because all of the coefficients are in their lowest whole number ratio.
D. No, because the number of hydrogen atoms on both sides of the equation are not equal.
E. Yes, because the number of products is equal to the number of reactants.
a sample of ammonia has a mass of 89.9g. how many molecules are in this sample?
Answer:3.90
Explanation:
A ring made of pure gold contains 5.29 x 1022 atoms. How many moles are in the ring?
Answer:
0.088 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.29 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.087873...[/tex]
We have the final answer as
0.088 molesHope this helps you
what happens to the radius of the atoms of an element as you go down a column of the periodic table ?
Answer:
Increases
Explanation:
The atomic radius increases as you go down a periodic table. Across a period which is a row, the atomic radius reduces.
The atomic radius is taken as the half of the inter-nuclear distance between two covalently boned atoms of non-metallic elements. It is also, half of the distance between two nuclei in the solid state. Across a period in the periodic table, atomic radii decreases progressively from left to right. Down a group it increases from up down.This woman is riding a bicycle down a hill at a constant speed and in a straight line. Which change will increase the speed of the bicycle?
A. An added force of 20 N down the hill
B. Added forces of 30 N up the hill and 30 N down the hill
C. Added forces of 30 N up the hill and 20 N down the hill
D. An added force of 20 N to the side of the hill
Answer:
The answer is A. An added force of 20 N to the side of the hill
Explanation:
Answer:Its A. An added force of 20 N down the hill, Not D. An added force of 20 N to the side of the hill. The first person meant A and meant to add force of 20 N down the hill.
Explanation:
Xenon-60 In order, what is the number of protons, electrons, and neutrons.
60,6,6
54,54,6
6,54,54
Answer:
I would say B?
54,54,6
Explanation:
What is the difference between random decay and theoretical?
Answer:
Spontaneous and random. Decay is called spontaneous because the occur on their own and are unaffected by external factors like temperature, pressure, and many more. Decay is called random because we cannot determine the rate at which it decays but can only determine the probability of the decay.Oct 21, 2015
Explanation:
Explain the periodic trend for ionization energy and why this occurs?
Answer:
Ionization energy tends to increase across a period because the nuclear pull is increasing while shielding is not changing because electrons are in the same energy level. Not only that as we move across a period elements are closer to a full octet.
Explanation:
Is the equation 2NO+02 NO, balanced? Explain your answer
Answer:
no its not balanced because we have 2 N in the reactants while we have 1 in the product same for 0 we have 2 0 in the reactants and 1 in the products
for it to be balanced it should be NO + O2 → NO2
Explanation:
An inflated balloon is left outside overnight. Initially, it has a volume of 38.7 L when the temperature is 255°C and the pressure is 9.4 atm. At what temperature (in °C) will the balloon have a volume of 65.9 L if the pressure falls to 4.2 atm?
Please anyone help me
Answer:
It is c
Explanation:
Answer:
W and Z, because they are in the same group as one another
a remote control toy jet fighter has a mass of 5 kg and can travel up to 60 m/s. what is the kinetic energy of the toy jet fighter at this speed?
Answer:
9000J
Explanation:
Given parameters:
Mass of the jet fighter = 5kg
Velocity = 60m/s
Unknown:
Kinetic energy of the jet fighter = ?
Solution:
The kinetic energy of a body is the energy due to motion of the body.
It is mathematically expressed as;
K.E = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
So;
K.E = [tex]\frac{1}{2}[/tex] x 5 x 60² = 9000J
