Answer:
3.5×10^-4 moles of methane is needed.
How much does a proton weigh
Answer:
9.11 x 10 -28 grams
Explanation:
You have a rock with a a volume of 15cm3 and a mass of 45 g. What is its density
Answer:
3 g/cm3
Explanation:
d=m/v
=45/15
= 3 g/cm3
Answer:
2.46621 cm
Explanation:
i used the formula p = m/V
9
A substance fills a jar. A scientist transfers the substance to a 2
liter bottle. The substance fills the entire space of the 2 liter bottle.
What is the state of matter of the substance?
Answer:
Liquid
Explanation:
The substance had appears to have a fixed volume but took the shape of the bottle it was transferred to.
If the substance doesn't have the same volume, the answer would be gas.
Explain the similarities and differences between combination, decomposition,
and replacement reactions.
HELP PLEASE POINTS++++++++++++++ IMA MAKE BRAINLIEST
what other substances are considered pure substances
Explanation:
B and C they are the pure substances
Elements are considered as pure substances . Elements are mostly metals, non - metals and metalloids , so option C is right.
What are Elements ?An element is a substance that cannot be broken down by non - nuclear reaction. Elements considered as a pure substance . All elements are mostly pure substances. A few of them include gold, copper, oxygen, chlorine, diamond, etc. Compounds such as water, salt or crystals, baking soda amongst others are also grouped as pure substances.
An element is a fundamental item that cannot be easily broken in smaller pieces. There are about 100 elements ,each with it's own types of atom. Everything in universe contain an atom of at least on or more than one elements.
Elements are pure substances ,hence option C is correct.
To learn more about elements refer the following link;
https://brainly.com/question/14347616
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Which of the subatomic particles are responsible for the differences in isotopes?
Protons
Electrons
Atoms
Neutrons
Answer: Neutrons
Explanation:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
Answer:
neutrons
Explanation:
isotopes has the same proton number but different nucleon number because there's different numbers of neutrons in isotopes
MORE HELP ILL GIVE BRAINLY if correct
In two or more complete sentences explain how to balance the chemical equation,
Ca + N2 ⟶ Ca3 + N2 and include all steps.
Answer:
ca +n2 is impossible to get trough a ca3 +n2 so you have to try to find a reasnable question like ca+n2 = ca3n2 then you need witch is the same but the chimacl blanice is off so when mixing the chimcals try to reduce the can2
but also try to make it be a better salution
Explanation:
hope that helps also good luck
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.
Barium phosphide Ba3P2 BaP Ba3PO4
Answer:
It A(Ba3P2)
Explanation:
I took the test
Answer:
It A(Ba3P2)
Explanation:
Name:
1.
Which formula represents an ionic compound?
A. NaCI
B. N20
C. HCI
D. H2O
Answer:A
Explanation: because it represents a salt which is a nonmetal
A rock has a density of 2.2 g/cm3 and a volume of 66.5 mL. How much mass does the rock have?
Given parameters:
Density of the rock = 2.2g/cm³
Volume of rock = 66.5mL
Unknown:
Mass of the rock = ?
Solution:
Density is the mass per unit volume of a body. It is mathematically expressed as shown below;
Density = [tex]\frac{mass}{volume}[/tex]
So;
Mass = Density x Volume
We need to take the given parameters to the same unit before we solve;
convert mL to cm³
1mL = 1cm³; 66.5mL is the same as 66.5cm³
Now solve;
Mass = 2.2 x 66.5 = 146.3g
The mass of the rock is 146.3g
____is the terrestrial planet that has almost no atmosphere
Answer:
Should be Mercury.
Explanation:
The atmospheres of the terrestrial planets range from thin to thick. Mercury has almost no atmosphere.
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
As the atomic number on the Periodic Table increases, the number of electrons A. is unchanged B. alternates C. decreases D. increases
Answer:
D.
Explanation:
I looked it up and said increases, i'm taking a test today in chemistry and had the same question lol.
Changes in ________ move matter from one state to another.
Answer: energy
Explanation:hope this helps.
Answer:
Temperature
Explanation:
why ie of nobel gases are very high
Answer:
noble gases are very high because they have the maxium amount of electrons in their outer shell
Explanation:
an ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of
Answer:
-3
Explanation:
The charge of the ion is determined by the number of protons and the number of electrons.
Protons are a positive + charge.
Electrons are a negative - charge.
We have 7 protons and 10 electrons.
+7 charge
-10 charge
-10 + 7 = -3 charge
Which is not a chemical element needed to build sugars?
Answer:
Nitrogen
Explanation:
Which is a better substitute for water, Li2O or H2S?
Answer:
h2s
Explanation:
The closest chemical analogue for water is hydrogen sulphide or H₂S. Because, both oxygen and sulfur are same group elements and shows similar properties.
What is H₂S?Hydrogen sulphide or H₂S is a covalent compound formed by the combination of two hydrogens and one sulphur atoms. In this compound, each hydrogen shares one electron to sulfur and sulfur shares its two valence electrons to each hydrogen.
Water is H₂O, which is formed by the strong hydrogen bonding between hydrogen and oxygen and it exists as liquid mostly. Most of the compounds can be dissolved in water.
Lithium oxide Li₂O is a covalent compound with partial ionic character and it does not exhibit any similarity with water in any case.
Bothe sulfur and oxygen are in 16th group. They are gases with high electronegativity. Hence, both H₂O, H₂S are polar compounds. Both sulfur and oxygen have affinity towards hydrogen. Both have similar shape and bond angle.
Moreover, H₂S can dissolve some minerals and acts as a good solvent like water.
Hence, the better substitute for water is H₂S.
To find more about H₂S, refer the link :
https://brainly.com/question/20365774
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Which has a greater energy, a photon of yellow light, or a photon of green light
Answer:
A photon of green light has a higher energy since it has a higher frequency than the yellow photon. And we can see that on the picture representation of the light spectre.
Question 2 of 10
What charge does an ion have if it has more protons than electrons?
O A. Neutral, since protons are inside the nucleus
B. A net positive charge
C. A net negative charge
O D. No charge
SUBMIT
Answer:
B. A net positive charge
Explanation:
a p e x 2021!
an isotope or barium (atomic number 56)has an mass of 138.how many neutrons are in the nucleus of this isotope
Answer:
Diagram of the nuclear composition and electron configuration of an atom of barium-138 (atomic number: 56), the most common isotope of this element. The nucleus consists of 56 protons (red) and 82 neutrons (blue).
What is the for this Name 0.1013
Answer:
it s not on periodic table this is not real element
Explanation:
Which is MOST likely to be considered “newsworthy”?
a study on which foods contain the most antioxidants, done five years ago
a study on which foods contain the most antioxidants, done two years ago
a study on which foods contain the most antioxidants, done last year
a study on which foods contain the most antioxidants, done last month
Rocks that originated from the liquid phase are classified as
rocks.
Answer:
igneous rocks
Explanation:
igneus rocks are sometimes considered primary rocks because they crystallize from a liquid
What are the three main technical support options for Microsoft users? Find It Myself, Ask the Community, Get Live Help Communities, Find It Myself, Guide Me Fix a Problem, Find It Myself, Communities Ask the Community, Get Live Help, Fix a Problem
Answer:
Find It Myself, Ask the Community, Get Live Help
Explanation:
The three main options for Microsoft users are Find It Myself, Ask the Community, Get Live Help. The first of which is finding it yourself through the search menu or help guidelines provided by Microsoft in all of their operating systems. Secondly, would be asking the community through search engines such as Google or through Microsoft help forums. Lastly, would be getting live help since Microsoft opertaing systems have a remote desktop feature that allows you to connect to another IT professional from a distance, or you can simply contact an IT professional to visit you in person for technical assistance.
6.(a) State any two ways by which water gets polluted.
(b) Name the components present in water gas.
which chemical species can easily for an ionic bond with a cation?
A. Sr
B. Ne
C. NH4+
D. PO4³-
Answer:Option D
Explanation:i took the test
Which of the following is a unit of density? = Mass / volume
A: liters per cubic gram
B:cubic meters
C:grams per cubic centimeter
D:square meters
Answer:
The correct answer is C.
Explanation:
To solve this problem, we should first recall possible units for mass and volume. Mass can be represented with units of grams, kilograms, etc. Volume has units of cubic meters, cubic centimeters, etc.
Therefore, since we know that density is mass divided by volume, the only answer that makes sense here is C. grams per cubic centimeter (where per signifies that grams are being divided by cubic centimeters).
Hope this helps!
what is the location of chlorine
Answer:
Chlorine can be found in abundance in both the Earth's crust and in ocean water. In the ocean, chlorine is found as part of the compound sodium chloride (NaCl), (table salt). In the Earth's crust, the most common minerals containing chlorine include halite (NaCl), carnallite, and sylvite (KCl).
Chlorine can be found in abundance in both the Earth's crust and in ocean water