Answer:
Neutron and Nucleus
Explanation:
Because isotopes are each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
I really need your help!!!!! Correct answers only, look at the picture.
Answer:
Student 2. Sugar dissolves the fastest in hot liquids, which means immediately stirring it in a hot liquid and THEN adding a colder one will yield the best results.
Explanation:
This is actually how I was always taught to make sweet tea.
What happens to an atom that experiences radioactive decay?
O A. It loses mass.
B. It absorbs energy.
C. It gains electrons.
D. It burns up.
Answer:
I think the answer is a
Explanation:
An atom loses mass when the atom experiences radioactive decay.
What is radioactive decay?
Radioactive decay is when the balance of protons and neutrons in the nucleus isn't quite right, so it emits particles and energy.
Radioactive decay is when the nucleus of an atom isn't stable - it could have too many protons that push each other apart, or too many neutrons, and it's just like a big lump of rock and can fall apart.
There are three kinds of radioactive decay, all named after Greek letters: alpha (α), beta (β) and gamma (γ).
α-decay happens in unstable nuclei and an α-particle is emitted, which is equivalent to the helium nucleus. Two protons and two neutrons are emitted, reducing the total mass number by four and the atomic number by two, making the atom into a new, smaller, more stable element.β-decay is when you've got too many neutrons, so a neutron decays into a proton. γ-decay is where the atom emits a photon with the wavelength of a γ-ray.Hence, option A is the correct answer.
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What type of plant rarely grows in the grasslands?
PLZ HELP IM CONFUSED
How many moles of methanol would be created if you started the reaction with 36.7 g of hydrogen gas?
(Round to 1 decimal place.)
Molar Masses:
H2= 202 g/mol
CO = 28.01 g/mol
CH3OH = 32.04 g.mol
Answer:
9.1 mol
Explanation:
The balanced chemical equation of the reaction is:
CO (g) + 2H2 (g) → CH3OH (l)
According to the above balanced equation, 2 moles of hydrogen gas (H2) are needed to produce 1 mole of methanol (CH3OH).
To convert 36.7 g of hydrogen gas to moles, we use the formula;
mole = mass/molar mass
Molar mass of H2 = 2.02g/mol
mole = 36.7/2.02
mole = 18.17mol
This means that if;
2 moles of H2 reacts to produce 1 mole of CH3OH
18.17mol of H2 will react to produce;
18.17 × 1 / 2
= 18.17/2
= 9.085
Approximately to 1 d.p = 9.1 mol of methanol (CH3OH).
How many grams of carbon dioxide gas are in a 1.0 L balloon at STP?
0.509 g
1.96 g
22.4 g
44.0 g
Answer:
I'm pretty sure its 1.96g
● Human blood has a hydrogen ion concentration is 10-7.4 mol/L. What is the pH of the blood?
Explanation:
PH=14-POH
=14-2.6
=11.4
4 main parts of a flower Include the function of each pls help me
Answer:
Calyx or sepalsCorollaAndroeciumGynoeciumDetermine the mass of ammonium chloride, NH4CI, required to prepare 0.250 L of a 0.35 M solution of ammonium chloride.
How much heat is required to convert 50.0 g of
water into steam?
Answer:
Let's say you're using joules. In that case, you'd need 153.7kJ.
Add labels for mass extinction and adaptive radiation:
Answer:
Couldn't figure out how to edit the other one to attach the image, but here is it with the labels. Also put the same explanation down below so you don't have to go to the other if you wanted to look at it in conjunction with the image.
Explanation:
Mass extinctions are periods of time where the organisms are essentially wiped out in an extremely brief period of time. You can see how the species just drops off. Adaptive radiation occurs when there is a diversification of a group of organisms as evident by the rise in the number of marine animal groups shown by the bracketed area.
How much heat is required to raise the temperature of 250.0 g of mercury by 52 degrees * C with a specific heat of 4.18
To raise the temperature of 250.0 g of mercury by 52°C with a specific heat capacity of 4.18 J/ g°C the heat required is 5.434×10¹ kJ.
What is specific heat capacity ?For a substance, it's specific heat capacity is the amount of energy required to raise the temperature of unit mass of that substance by 1°C.
If, specific heat capacity (c) = 4.18 J/ g°C
Mass of the substance (m) = 250.0 g
Change in temperature (ΔT) = 52°C
Energy (Q) = ?
Then mathematically the relation could be represented as
c = [tex]\frac{Q}{ \ m \ (\Delta\ T )}[/tex]
Therefore, [tex]Q = m\times c \times (\Delta\ T)[/tex]
[tex]Q = 250 \times 4.18 \times 52[/tex]
[tex]Q = 54,340 J\\Q = 5.434 \times 10^1 kJ[/tex]
So, to raise the temperature of 250.0 g of mercury by 52°C with a specific heat capacity of 4.18 J/ g°C the heat required is 5.434×10¹ kJ.
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Please help. Which of these are chemical or physical change?
Answer:
Explanation:
a is a physical change you could put the peices back together
b is a chemical change because you cant unburn wood
c is a chemical change because you cant unbake it
d is a physicl change you could te your time and unmix it
8. What is a compound?
A. a substance in which the atoms of three or more elements are combined together
B. an atom with more electrons than protons
C. a substance in which the atoms of two or more elements are combined together
D an atom with more neutrons than protons
Answer:
c
Explanation:
Long scratch marks that are left behind as evidence of glaciers are called
A. striations
B. cirques
C. fjords
D. roche moutonnees
Answer:
it is A striations
Explanation:
..........
Answer:
Striation
Explanation:
2C2H6 + 7O2 ------> 4CO2 + 6H2O
If you are given 10 grams of C2H6 and 10 grams of O2 how many grams of H2O would you produce? Hint: find the limiting reactant. Answer should have 3 decimal places.
Right answer gets brainliest
We convert the masses of our reactants to moles and use the stoichiometric coefficients to determine which one of our reactants will be limiting.
Dividing the mass of each reactant by its molar mass:
(10 g C2H6)(30.069 g/mol) = 0.3326 mol C2H6
(10 g O2)(31.999 g/mol) = 0.3125 mol O2.
Every 2 moles of C2H6 react with 7 moles of O2. So the number of moles of O2 needed to react completely with 0.3326 mol C2H6 would be (0.3326)(7/2) = 1.164 mol O2. That is far more than the number of moles of O2 that we are given: 0.3125 moles. Thus, O2 is our limiting reactant.
Since O2 is the limiting reactant, its quantity will determine how much of each product is formed. We are asked to find the number of grams (the mass) of H2O produced. The molar ratio between H2O and O2 per the balanced equation is 6:7. That is, for every 6 moles of H2O that is produced, 7 moles of O2 is used up (intuitively, then, the number of moles of H2O produced should be less than the number of moles of O2 consumed).
So, the number of moles of H2O produced would be (0.3125 mol O2)(6 mol H2O/7 mol O2) = 0.2679 mol H2O. We multiply by the molar mass of H2O to convert moles to mass: (0.2679 mol H2O)(18.0153 g/mol) = 4.826 g H2O.
Given 10 grams of C2H6 and 10 grams of O2, 4.826 g of H2O are produced.
How many joules of heat are needed to raise the temperature of 15g of aluminum from 28C to 99C if the specific heat of aluminum is .90 j/gC?
Answer:
In order to increase the temperature of 1 g of aluminium by 1∘C , you need to provide it with 0.90 J of heat
Explanation:
One of the leading contributors to climate change is the burning of fossil fuels such as natural gas and oil. Name four things people use every day that directly or indirectly consume fossil fuels. Explain your reasoning.
Answer:cars
Explanation:bc it uses oil
Cars and trucks, coal-fired power plants, airplanes, large industrial operations are the four things people use every day that directly or indirectly consume fossil fuels.
What are fossil fuels?A fossil fuel is a hydrocarbon containing substance that is recovered and used as fuel that naturally forms in the Earth's crust from the remains of dead plants and animals. Fossil fuels include coal, oil, and natural gas.
A general name for non-renewable energy sources such crude oil, petroleum products, natural gas, derived gas, coal, coal products, and non-renewable wastes is "fossil fuel."
These fuels come from plants and animals that lived in the distant past of the earth's history, such as millions of years ago.
Therefore, fossil fuels can be burned to produce energy, operate engines, or offer direct heat.
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Please help me I need to finish before my class is over
Number 3 is D
Number 4 is B
Number 5 is B
I think
Answer:
Number 5 is b is the correct answer
why are some metals such as copper and aluminium not magnetic
Answer:i dont know
Explanation:
I D
K
When two or more simple machines are combined they form a(n) ____.
A. Compound machine
B. Complex machine
C.intricate machine
D.inefficient machine
Answer:
A
Explanation:
A compound machine is a combination of two or more simple machines.
When(NH4)2SO4(aq) and Ba(NO3)2(aq) react
Answer:
1 (NH4)2SO4 + Ba(NO3)2 → NH4NO3 + BaSO4
2 (NH4)2SO4 + Ba(NO3)2 → Ba(SO4) + (NH4)(NO3)
Explanation:
If a compound contains a poly atomic ion then what type of compound is it A. Convalent Compound B. Ionic Compound
Answer:
B. Ionic Compound
Explanation:
An ionic compound is that compound which contains a positively charged ion called CATION and a negatively charged ion called ANION. The cation loses or transfers electrons to the anion, hence, making the former (cation) positive and the latter (anion) negative.
A polyatomic ion is an ion that contains more than one type of atom e.g OH-, NO3²-, CO3²- etc. A polyatomic ion usually has an overall charge formed from the charges of the individual atoms that makes it up. For example, in OH-, the overall charge is -1.
Since a polyatomic ion can have an overall positive or negative charge, it must enter a reaction with another ion that complements it i.e. a negative polyatomic ion will react with a positive ion to neutralize its charge. Hence, this forms an IONIC COMPOUND. This is why most compounds with polyatomic ions are IONIC COMPOUNDS.
For example, CaCO3 is an ionic compound formed when Ca²+ (cation) reacts with the polyatomic anion: CO3²-
What are the units of molar mass?
O A Lg
B. g/mol
O C. g/L
D. mol/g
Answer:
The answer is B.units of molar mass are g/mol
I need help with this :/
Answer:
Blank 1: 1
Blank 2: 2
Blank 3: 1
Blank 4: 1
Explanation:
Assuming this is to balance the equation, write out the amount of each element you have on the reactants side and on the products side
Reactants Products
Ca 1 Ca 1
C 2 C 2
H 2 H 4
O 1 O 2
Comparing the two, we can see that hydrogen and oxygen have different amounts between reactants and products. Therefore, we need to multiply by some number to get the two equal. If we multiply the reactants by 2 we will get the correct amount in the products. So we put a 2 in front of the H₂O to signify this.
The balanced chemical reaction is
CaC₂ + 2 H₂O --> C₂H₂ + Ca(OH)₂
Which of the following would most likely be found in the outer cloud
region?
Answer:
there is no "following". if you can attach an image for me, ill be glad to help.
Explanation:
have a good day,
~evita
I have too much rainfall in a short time period. My victims must be rescued from the top of houses and their property is in ruins. What am I?
Answer:
a flash flood
If 25.0 g of iron(III) phosphate reacts with excess sodium sulfate, how many molecules of sodium phosphate can be made?
Answer:
so mucjsuat least amount of soduim is will be 25percent
a force is 24N is exerted on 2 carts. Cart A has a mass of 45kg and cart B has a mass of 25kg. Which cart will have the greater acceleration?
What is the method of harvesting trees during logging where a small number of
mature trees are left intact called ?it’s for a crossword puzzle and it consists of two words and together they should have 17 letters
I need the 3 questions !!! About Rubidium (Rb)
ASAP PLEASE DUE IN LIKE 20 min
Answer:
419kJ/mol 5,0,0,+12That catches fire spontaneouslyExplanation:
1. Topic: Chemistry
ElementFirst Ionization Energy (kJ/mol) Lithium520Sodium496Rubidium403Cesium376According to the above table, which is most likely to be the first ionization energy for potassium?
536kJ/mol 504kJ/mol 419kJ/mol 391kJ/mol 358kJ/mol2. Topic: Chemistry, Atom
The correct set of four quantum numbers for the valence electrons of the rubidium atom (Z=37) is:
5,1,1,+12 5,0,1,+12 5,0,0,+12 5,1,0,+123. Rubidium and cesium are pyrophoric. Here the term pyrophoric means:
That hardly catches fireThat does not catch fire at all That catches fire spontaneously None of these