Answer:
A i did it on edge
Explanation:
Aaaaaaaaaaaaaaa
Young stars, just beginning their life in the galaxy, would contain mostly
A)
carbon
B)
helium
iron and nickel
D)
hydrogen and helium.
Answer:Hydrogen and Helium
Explanation: Young stars would contain first hydrogen, then helium.
Young stars, just beginning their life in the galaxy, would contain mostly hydrogen and helium. That is option D.
What are young stars?A young star is a newly formed luminous object that is found in the galaxy.
The young star is mostly made up of two very light elements called hydrogen and helium. They also shine by conversion of hydrogen into more helium.
Therefore, Young stars, just beginning their life in the galaxy, would contain mostly hydrogen and helium.
Learn more about galaxy here:
https://brainly.com/question/1995133
#SPJ2
Que cantidad de agua (solvente) se necesitara para preparar 240 grs de una solucion al 25% en m/m ?
Answer:
180g
Explanation:
El soluto y el solvente son los componentes químicos que se mezclan en una solución. El soluto es una sustancia química, la cual puede poseer diferentes estados de agregación (es decir, sólido, líquido o gaseoso), que se se disuelve en un solvente; mientras que el solvente es una sustancia en estado líquído en la cual se diluye el soluto, formando una solución. La solubilidad de una sustancia química se define como la proporción en que una cantidad determinada soluto puede disolverse en una determinada cantidad de un solvente, a una temperatura específica. En este caso, 240 gramos (g) corresponde al 100% del contenido total de la solución, con lo cual la cantidad de solvente (agua) de una solución al 25% correspondería a la siguiente fórmula:
X = (75 x 240g) / 100
X = 180g
Question 13 (5 points)
(01.06 MC)
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide?
Options:
It can be separated into carbon and oxygen using physical methods.
Carbon and oxygen retain their original identity in it.
Carbon and oxygen are chemically bonded in it.
Explanation:
Sorry the guy asking forgot to put in the options so comment below the correct answer and brainy STOP DISABLING COMMENTS YOUR CAUSING SO MANY INCORRECT THINGS
write the fraction of the mass of kcl produced from 1 g of k2c03
Mass of KCl= 1.08 g
Further explanationGiven
1 g of K₂CO₃
Required
Mass of KCl
Solution
Reaction
K₂CO₃ +2HCl ⇒ 2KCl +H₂O + CO₂
mol of K₂CO₃(MW=138 g/mol) :
= 1 g : 138 g/mol
= 0.00725
From the equation, mol ratio K₂CO₃ : KCl = 1 : 2, so mol KCl :
= 2/1 x mol K₂CO₃
= 2/1 x 0.00725
= 0.0145
Mass of KCl(MW=74.5 g/mol) :
= mol x MW
= 0.0145 x 74.5
= 1.08 g
How can you determine if a molecule is held together by covalent bonds?
PLSS ANSWERRRR
Earthquakes are relatively common throughout the west coast, especially in California. The map of California seen here gives you an idea why. Explain what is happening along with the red arrows on the map.
A.) The Pacific Plate and the North American plate are diverging.
B.) The sea floor is spreading where the Pacific and North American plates meet. (Converge)
C.) There is a transform boundary, commonly causing strike-slip faults, between the Pacific and the North American plates.
D.) There is a convergent plate boundary between the oceanic and continental plates.
Answer:
b
Explanation:
the discovery of protons and electrons most directly refuted or replace the idea that
- atoms contain a nucleus
- the Atom is indivisible
- the atom is electrically neutral
- the atom resembles plum pudding
Answer:
The atom resembles plum pudding
Explanation:
The discovery of the electron in 1897 by J. J Thomson and the proton in 1917 by Rutherford most directly refuted or replace the idea that the atom resembles plum pudding.
What do the elements Ni, and Tc have in common?
Answer:
I know that
Explanation:
nickel is like to and tc is like nickel they both have something
2)
Compare the atomic radius of an atom of bromine to the atomic radius of an atom
potassium when both atoms are in the ground state.
He reaction produces 1.6 g of gas in 30 seconds.Calculate the mean rate of the reaction in the first 30 seconds.Use the equation:
Answer:
Mean rate of reaction produced = 0.533 g/sec (approx.)
Explanation:
Given:
Reaction produced = 1.6 gram
Time taken = 30 sec
Find:
Mean rate of reaction produced
Computation:
Mean rate of reaction produced = Reaction produced / Time taken
Mean rate of reaction produced = 1.6 / 30
Mean rate of reaction produced = 0.533 g/sec (approx.)
Calculate the second volumes. 955 L at 58 C and 108 KPa to 76 C and 123 KPa
The second volume : V₂= 884.14 L
Further explanationGiven
955 L at 58 C and 108 KPa
76 C and 123 KPa
Required
The second volume
Solution
T₁ = 58 + 273 = 331 K
P₁ = 108 kPa
V₁ = 955 L
P₂ = 123 kPa
T₂ = 76 + 273 = 349
Use combine gas law :
P₁V₁/T₁ = P₂V₂/T₂
Input the value :
108 x 955/331 = 123 x V₂/349
V₂= 884.14 L
ann swims the length of a 50 meter swimming pool in 25 seconds. what is her average speed.
this is science
Answer:
2m/s
Explanation:
2meters/second
RNA is a single stranded nucleic acid that is read by ribosomes to
synthesize a cell's protein. True or false?
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.
P4(s)+NaOH(aq)+H2O(l)➪
PH3(g)+Na2HPO3(aq)
Answer:
P₄ + 4NaOH + 2H₂O → 2PH₃ + 2Na₂HPO₃
Explanation:
The given reaction expression is given as:
P₄ + NaOH + H₂O → PH₃ + Na₂HPO₃
To solve this problem, now we put coefficients a, b, c, d and e and we use a mathematical approach to solve this problem;
aP₄ + bNaOH + cH₂O → dPH₃ + eNa₂HPO₃
Conserving P: 4a = d + e
Na: b = 2e
O: b + c = 3e
H: b + 2c = 3d + e
let b = 1, e = [tex]\frac{1}{2}[/tex] , c = [tex]\frac{1}{2}[/tex], d = [tex]\frac{1}{2}[/tex], a = [tex]\frac{1}{4}[/tex]
Multiply through by 4;
b = 4, e = 2, c = 2, d = 2, a = 1
P₄ + 4NaOH + 2H₂O → 2PH₃ + 2Na₂HPO₃
Copper chloride burns bright green 510x10^9 m what is the frequency in Hz?
Answer:
5.88 x 10⁻⁴Hz
Explanation:
Given parameters:
Wavelength = 510 x 10⁹m
Unknown:
Frequency = ?
Solution:
To solve this expression, we use the equation below:
V = f∧
V is the velocity = 3 x 10⁸m/s
f is the frequency
∧ is the wavelength
3 x 10⁸ = f x 510 x 10⁹
f = 5.88 x 10⁻⁴Hz
a 182.4g sample of germanium-66 is left undisturbed for 22.5 hours. At the end of that period, only 5.70g remain. What is the half-life of this material?
Answer:
Approximately [tex]4.5\; \text{hours}[/tex].
Explanation:
Calculate the ratio between the mass of this sample after [tex]22.5\; \text{hours}[/tex] and the initial mass:
[tex]\displaystyle \frac{5.70\; \rm g}{182.4\; \rm g} \approx 0.03125[/tex].
Let [tex]n[/tex] denote the number of half-lives in that [tex]22.5\; \text{hours}[/tex] (where [tex]n\![/tex] might not necessarily be an integer.) The mass of the sample is supposed to become [tex](1/2)[/tex] the previous quantity after each half-life. Therefore, if the initial mass of the sample is [tex]1\; \rm g[/tex] (for example,) the mass of the sample after [tex]\! n[/tex] half-lives would be [tex]{(1/2)}^{n}\; \rm g[/tex]. Regardless of the initial mass, the ratio between the mass of the sample after [tex]n\!\![/tex] half-lives and the initial mass should be [tex]{(1/2)}^{n}[/tex].
For this question:
[tex]{(1/2)}^{n}} = 0.03125[/tex].
Take the natural logarithm of both sides of this equation to solve for [tex]n[/tex]:
[tex]\ln \left[{(1/2)}^{n}}\right] = \ln (0.03125)[/tex].
[tex]n\, [\ln(1/2)] = \ln (0.03125)[/tex].
[tex]\displaystyle n = \frac{\ln(0.03125)}{\ln(1/2)} \approx 5[/tex].
In other words, there are [tex]5[/tex] half-lives of this sample in [tex]22.5\; \text{hours}[/tex]. If the length of each half-life is constant, that length should be [tex](1/5) \times 22.5\; \text{hours} = 4.5\; \text{hours}[/tex].
Metals tend to have a_______
attraction for
electrons
Answer plz
Answer:
Metals tend to have a low attraction for electrons.
the two factors that combine to keep the planets in orbit are-
A.gravity and orbital speed
B.orbital speed and mass
C.mass and inertia
D.gravity and inertia
Answer:
D. Gravity and inertia
When it happens orbital motion occurs
How many atoms of oxygen are in a molecule of glucose (C6H12O6)?
Record your answer. Be sure to use the correct place value.
Answer:
There are 6 oxygen atoms.
Explanation:
Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms.
hope this helps
The molecular formula of glucose is C₆H₁₂O₆, therefore one molecule of glucose has six oxygen atoms.
What is the chemical formula?A chemical formula is a way of representing information about the chemical proportions of atoms of each element that are present in a molecule or chemical compound. The chemical formula can be written by using chemical symbols, numbers, and other symbols, such as commas, dashes, brackets, and plus (+) and minus (−) signs.
A chemical formula of a compound contains no words but can represent certain simple chemical structures. Chemical formulae are usually more limited in power than structural formulae and chemical names. There are two types of chemical formulas one empirical formula and another molecular formula.
In a molecular formula, more than one atom of the same element can be represented by subscripts. The given formula of glucose is C₆H₁₂O₆ and the total number of oxygen atoms in the formula is equal to six.
Learn more about chemical formula, here:
brainly.com/question/11140581
#SPJ2
How can we determine the number of significant figures in measurements?
Answer:
Rule 1: All nonzero digits in measurement are significant.
Rule 2: Zeros that appear between other nonzero digits (i.e., "middle zeros") are always significant.
Rule 3: Zeros that appear in front of all of the nonzero digits are called leading zeros. Leading zeros are never significant.
Rule 4: Zeros that appear after all nonzero digits are called trailing zeros. A number with trailing zeros that lacks a decimal point may or may not be significant.
Rule 5: Trailing zeros in a number with a decimal point are significant. This is true whether the zeros occur before or after the decimal point.
please answer Seed plants are divided into two groups. What are they? GIVING BRIANLIEST TO WHOEVER IS RIGHT.
vascular and nonvascular
brown seeds and green seeds
nonflowering and flowering
fruits and vegetables
Answer: nonflowering and flowering
Explanation: i just did the quiz
Seed plants are divided into two groups, are nonflowering and flowering plants. Therefore, option C is correct.
What is flowering plant ?Flowering plants create blooms, which they then use as seeds to develop more of their kind or other plants. Nonflowering plants don't produce flowers; instead, they produce microscopic reproductive components called seeds or spores that can be used to create additional plants that look exactly like them.
Gymnosperms and angiosperms are frequently used as arbitrary divisions for the seed plants. The difference between the two is based on the fact that angiosperms produce blooms, whereas gymnosperms do not.
An ovary surrounds the angiosperm seed. A seed grows on the size of a cone in gymnosperms. Inside an ovary, only an angiosperm seed can grow.
Thus, option C is correct.
To learn more about flowering plant, follow the link;
https://brainly.com/question/19601929
#SPJ2
What Is the Difference Between Molar Mass and Molecular Weight in HNO3?
Difference between molecular weight and molar mass
Hint : Molar mass of molecules is also called molecular weight . Its unit is gram per mole. We can calculate molar mass of molecule with the help of following rules; ... Molar mass of nitric acid (HNO3) =atomic mass of hydrogen + atomic mass of nitrogen +3× atomic mass of oxygen .
Answer:
answer
Explanation:
Sorry I do not know the answer, hope you have a great day
An example of a chemical change is
Mashing potatoes
Dew disappearing from the grass
Frying a hamburger
A magnet sticking to the refrigerator
Answer:
Frying a hamburger
Explanation:
when frying a hamburger you change the properties of the meat by applying heat and in the other answer choices the element is not changed.
If you could zoom enough to see atoms how would u find out if it is a compound element or a
mixture
There is no _____ movement in a strike-slip fault, meaning there are no mountain ranges.
Answer:
isostatic adjustment movement
Which of these elements is the odd one out? Li Na Mg K Rb Cs
Answer: cc
Explanation:..
12 points and brainest
Answer:
wavelength
Explanation:
Answer:
wavelength
Explanation:
I need to turn this in a 3:00 sharp
Answer:
i think their is amswer key for that
Explanation:
HELP I’ll give Brainliest
Answer: The first question’s answer is 2 and the second question answer is 3. 12.B, 13.C
Explanation:
Four grams of magnesium react with an excess of dilute hydrochloric acid. Calculate the volume in liters of hydrogen gas collected over water at 300 K, if the vapor pressure of water at that temperature is 26.7 mm and the barometric pressure is 730 mm
