Answer:
2 H2O(l) → 2 H2(g) + O2(g)
Explanation:
H2O(l) → H2 (g) + O2 (g)
Add 2 to both sides:
Reactants: Products:
H: 2+2=4 H: 2+2=4
O: 1+1=2 O:2
2 H2O(l) → 2 H2(g) + O2(g)
Therefore it is balanced, hope this helps.
How many protons does Na have?
Answer:
11 protons
Explanation:
Answer:
11 protons
Explanation:
since it is neutral it has 11 electrons as well
how does resistance change with temperature? is there more resistance or less resistance at higher temperatures?
Answer:
resistance becomes lower at higher temperatures.
Explanation:
molecules expand instead of compact
Which of the following explains how Marie and Pierre Curie tried to influence the use of their discovery?
They supported the use of radioactive elements in generating inexpensive power.
They opposed the use of energy released during nuclear fission at the time of war.
They supported the use of radioactive elements for medical diagnostic purposes.
They opposed the use of nuclear fusion during the Manhattan Project.
Answer:
The answer is “They supported the use of radioactive elements for medical diagnostic purposes”.
Answer:
They supported the use of radioactive elements for medical diagnostic purposes.
Explanation:
(Its a recorded fact)
The function of the nervous system is to A) help protect the body from disease. B) bring oxygen, nutrients and hormones to cells. C) control growth, development, metabolism and reproduction. D) coordinate the body's response to changes in its environment.
Answer:
D is correct.
Explanation:
Which of Dalton's ideas about the atom did J.J. Thomson's experiment disprove?
It disproved that atoms are divisible.
It disproved that atoms are indivisible.
It disproved that atoms contain protons.
It disproved that atoms contain electrons.
Answer:
It is disproved that atoms are indivisible. Which is answer choice B.
Explanation:
I got it right on Edge. :)
We have that this means that It disproved that atoms are indivisible
Option C
From the question we are told
Which of Dalton's ideas about the atom did J.J. Thomson's experiment disprove?
It disproved that atoms are divisible. It disproved that atoms are indivisible. It disproved that atoms contain protons. It disproved that atoms contain electrons.
Generally
Dalton defined an atom as the smallest particle of an element
This was disapproved of by J.J. Thomson's experiment
Therefore
This means that It disproved that atoms are indivisible
Option C
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Which of the following is made of cells?
A. a rock
B. a snowflake
C. a raindrop
D. a leaf
Answer:
a snowflake
Explanation:
Snowflake Symmetry. All ice crystals (of ordinary 'Ice 1h' that is) have the same basic hexagonal symmetry. The fundamental building block is a unit cell containing four water molecules. Ice crystals can be thought of as made of untold stacks of these unit cells.
9 Dr. Garcia is performing an experiment to see how cell division in flies is affected by the addition of a certain protein, called protein W, into a cell's cytoplasm. She has found that adding protein W to a cell drastically reduces the chances of the cell becoming cancerous. For protein W to be developed into a cancer treatment, what comparison should she make?
Answer:
The fly cells must be compared with human cells
Explanation:
Dr. Gracia's aim is the development of a potential cancer treatment. Remember that the treatment is meant for human beings.
Usually, the pre-clinical trials of the treatment is carried out on other organisms and the success rate is evaluated before trial on humans.
If protein W has been effective on flies, its effect on human cells should also be diligently compared before conclusions are drawn regarding the therapeutic effects of protein W.
Which biome would be found nearest to the equator
Answer: Tropical Rainforest
Explanation: Tropical rainforest are found near the equator because it is wamrer.
Hope this helps.
An unknown metal, "X," reacts to make a compound that has the formula X(OH). Which of the following metals could possibly be the identity of metal X?
What is the comversion factor used when converting mass to moles?
A. 6.02 x10 particles = 1 mole
B. 22.4L = 1 mole
C. the answer is not listed
D. molar mass = 1 mole
Answer:
6.02 x 10^23 particles = 1 mole
Explanation:
If A. has 10 to the power of 23 then that is the answer, but if it does not, then the answer is C.
witch characteristic of a mineral states that it cannot come from somthing living or formally living
Answer:
It is inorganic
Explanation:
The characteristic of minerals that states that it cannot come from something living is that minerals are inorganic chemical substances.
A mineral is a defined as a naturally occurring solid inorganic chemical substance, made up of a definite composition and well defined crystal structure.
As an inorganic solid, minerals cannot be produced in living cellsOrganic compounds are produced in living organisms. All minerals except for a few are produced by non-living processes.Some nickel sulfate solution was carefully placed in the bottom of s beaker of water, the beaker was then covered and left for several days. Explain what happens in several days
Answer:
The nickel sulfate will completely mix with the water in the beaker to form a uniform green solution
Explanation:
When the nickel sulfate solution is placed in the bottom of the beaker of water, its molecules will more concentrated at the bottom of the beaker than in other parts of the beaker. Due to this high concentration of nickel sulfate molecules, the molecules will be colliding with one another at a frequent rate. With every collision occurring between the molecules, the molecules will continue to spread out further to other parts of the beaker where there is more space for the molecules and therefore less frequency of collision. Eventually, after many days, the molecules will spread out throughout the whole beaker completely mixing with the water molecules. This process is known as diffusion, which is defined as the movement of molecules from a region of high concentration to a region of low concentration until equilibrium is attained.
What defines our current ‘standard' for one meter? A The distance equal to 1/10,000,000 the distance between the Equator and North Pole b The length of a pendulum arm that takes 1 second to swing from left to right c The distance a 1 kilogram object travels in one second when acted on by a force of 1 newton d The distance light travels in a tiny fraction of a second
Answer:
The distance light travels in a tiny fraction of a second
Explanation:
One meter is defined as the length of the path travelled by light in a vacuum in [tex]\dfrac{1}{299 792 458}[/tex] of a second. It is also equal to the one [tex]\dfrac{1}{10}[/tex] of the distance from the equator to the North Pole. It is one of the fundamental units. It is a SI unit of length. So, the standard definition of 1 mete is the distance light travels in a tiny fraction of a second.
Hence, the correct option is (d).
What is the charge of the atom
The overall charge of an atom is zero.
Atoms are made up of positively charged particles called protons and negatively charged particles called electrons as well as non-charged particles called neutrons.
How many atoms are in 4.67 moles of lead ?
Answer:
i believe the answer is 2.812
Explanation:
what is the mass in grams of 1.355 mol Ca
Answer:
the molar mass of the components making up Ca(NO₃)₂ are as follows;
Ca - 40 g/mol
N - 14 g/mol
O - 16 g/mol
the molar mass of the compound is calculated as follows;
Ca(NO₃)₂ --> 40 + 2(14 + 16x3)
= 164 g/mol
1 mol of the compound weighs 164 g
Therefore 0.433 mol = 164 g/mol x 0.433 mol
= 71.0g
the mass of 0.433 mol of the compound is 71.0 g
Evergreen trees have leaves that stay green all year long. Many evergreens have needles that remain on the tree through changes in the seasons, unlike broad leaf trees that lose their leaves in preparation for winter. How might this adaptation help evergreen trees survive in the taiga, a cold biome with long, dark winters?
Answer:
See explanation
Explanation:
The leaves or needles of evergreen trees lose less water than other kinds of leaves. This means that they are better able to conserve water in the taiga, a cold biome with long, dark winters.
These conifers possess adaptations that are able to help them survive the long, cold winters and short summers in a typical taiga biome since their needles contain very little sap, which also helps prevent them from freezing.
I’m not sure why it’s not letting me post comment but this is the correct answer for my last question.
Answer:
oh okie nice work
thanks for the remainder
005 10.0 points
Covalent bonds involve
1. electrostatic forces.
2. different charges.
3. a sharing of electrons.
4. a transfer of electrons.
Answer:
3. a sharing of electrons
Explanation:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions. In other words, it does not involve ions.
An atom has a mass number of 19 and an atomic number of 9. What
element is it? What is its symbol? How many protons, neutrons, and
electrons does it have?
Looking at the chemical reactions in each answer choice, please choose the chemical reaction that is balanced. A. Pb(OH)2 + 2HCl → 2H2O + PbCl2 B. 2Pb(OH)2 + HCl → H2O + 2PbCl2
Answer:
A. Pb(OH)2 + 2HCl → 2H2O + PbCl2
Explanation:
In a balanced reaction, the amount of different atoms in the products must be equal to number of atoms in reactants. With the equations of the problem:
A. Pb(OH)2 + 2HCl → 2H2O + PbCl2
There is 1 atom of Pb in reactants and products.
2 atoms of O in both sides.
4 atoms of H
And 2 atoms of Cl
That means this reaction is balanced
B. 2Pb(OH)2 + HCl → H2O + 2PbCl2
2 atoms of Pb
4 atoms of O in reactants but just 1 in products.
As the amount of oxygen is not equal for reactants and products we can say the reaction is unbalanced.
And right choice is A.
please help i will mark brainlist
Answer:
they be Cappin like a mf
Explanation:
tell the truth mf
I think the answer is 10!
4. This is a diagram of a sol texture triangle. Farmers can use this chart to identify the type of soil found on their land and determine the likelihood of erosion and other important factors. What type of soil does a farmer have if the soil contains 40% sand, 40 silt, and 20% clay?
Type of soil : Loam
Further explanationA mixture is a combination of two or more single substances. The properties of the mixture component are not lost / unchanged as in compounds.
The mixture can be divided into a homogeneous mixture if the composition/ ratio of each substance in the mixture is the same and a heterogeneous mixture if the ratio of the composition of the substances is not the same (can be varied) in each place.
Soil is part of a mixture that has a different composition
To find the type of soil, we just need to draw a line of intersection between the 3 compositions shown
So the soil contains 40% sand, 40 silt, and 20% clay : Loam
How far is the Moon from Earth? Where will it be relative to its current location 100 years from now?
The moon is 150 inches far from the earth to its current location 100 years from now.
What is earth ?Only one celestial object, Earth, which is third from the Sun, is known to support life. Although the Solar System contains enormous amounts of water, only Earth is home to liquid surface water. The oceans cover around 71% of Earth's surface, dwarfing its lakes, rivers, and polar ice.
Because Earth was never an unknown entity to mankind, it was never properly "discovered." Its shared status as a "planet" with other bodies, nevertheless, was just recently discovered.
The moon travels around 251,000 miles from Earth during its apogee, or farthest point from our planet. Solar eclipses that have an annular shape, or a "ring of fire," are among the best examples of apogee in nature.
Thus, the moon is 150 inches far from the earth to its current location 100 years from now.
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You notice after you walk across a room, you feel a spark when you touch the doorknob. What energy transformation must have taken place?
Choices Are:
-Thermal to Radiant
-Mechanical to Electrical
-Radiant to Mechanical
Answer:
Thermal to Radiant
Explanation:
I need urgent help for this
Which equation is balanced
I need help ASAP
Answer:
2Mg+O2=2MgO
Atomic number of Mg and O is equal in both side
What particle is emitted during the following transmutation:
6729Cu→6730Zn+
____?
A.beta particle,
0−1e
B.
positron,
01e
C.alpha particle,
42He
D.gamma particle,
00γ
Answer:
A beta particle, = ₋₁⁰e
Explanation:
Alpha beta and gamma radiations are the examples of ionizing radiations.
Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.
Properties of beta radiations:
The mass of beta particle is smaller than the alpha particles.
They can travel in air in few meter distance.
These radiations can penetrate into the human skin.
The sheet of aluminum is used to block the beta radiation
⁶⁷₂₉Cu → ⁶⁷₃₀Zn + ⁰₋₁e
The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.
Which of the following are used to determine whether a substance is an acid or a base? (select all that apply)
orange juice
litmus paper
universal indicator
water
The proteins in the cell membrane allow substances to come or go based on their concentrations. This is an important part of _____ which maintains the immediate conditions necessary for life.
a. osmosis
b. metabolism
c. homeostasis
d. endocytosis
Answer:
C. Homeostasis
Explanation:
