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
Which equation is balanced
I need help ASAP
Answer:
2Mg+O2=2MgO
Atomic number of Mg and O is equal in both side
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.
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?
please help i will mark brainlist
Answer:
they be Cappin like a mf
Explanation:
tell the truth mf
I think the answer is 10!
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.
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)
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?
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.
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.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).
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
For more information on this visit
https://brainly.com/question/17756498
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.
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
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.
Consider a balloon that has a volume V. It contains n moles of gas, it has an internal pressure of P, and its temperature is T. If the balloon is heated to a temperature of 15.5T while it is placed under a high pressure of 15.5P, how does the volume of the balloon change? It doubles. It stays the same. It increases greatly. It decreases slightly.
Answer:
It stays the same
Explanation:
From the gas law:
P1V1/T1 = P2V2/T2
P1 = P, V1 = V, T1 = T and P2 = 15.5P, V2 = ? , T2 = 15.5T
Substituting the various variables into the gas law equation:
PV/T = 15.5PV2/15.5T
Make V2 the subject of the formula:
V2 = 15.5TPV/15.5PT
V2 = V.
V1 = V and V2 = V, hence, the volume of the balloon stays the same.
Answer:
It stays the same
Explanation:
Edge 2020
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:
The model below shows a carbide ion. 8 light grey and 6 dark grey balls sit at the center with 2 concentric black rings around them. The inner ring has 2 medium grey balls on it, and the outer ring has 8 medium grey balls on it. At bottom, a dark grey ball = +1, a light grey ball = 0, a medium grey ball = negative 1.
Answer:
Explanation:
The question wants us to determine what could be done to change the carbide ion to a neutral carbon atom.
From the given information:
The dark grey ball has a +1 charge, which implies that the positive charge is the proton. Also, the light grey ball is denoted by 0 charge, which signifies that it is a neutron because a neutron usually has no charge, and its mass is equal to the mass of the proton.
Consequently, the -1 charge on the medium grey ball signifies that it is an electron.
In a neutral atom, the number of protons usually equal to the electron number. However, in as much as no overall charge is present from the model of the atom given. We can say that the atom is neutral.
Let also recall that the atomic number is the number of available protons present in the element's atomic nucleus.
Thus, in the given atom.
The total number of proton = 8
The total number of neutron = 9
The total number of electron = 8
Since atomic number relates to the number of protons, the atomic number is also = 8
Answer: C :)
remove 4 electrons
Explanation:
good luck
Carla is making two drinks. She is making one hot chocolate and one chocolate milk. Which best describes the agitation needed to make sure the cocoa powder is mixed in well? Chocolate milk would require more agitation than hot chocolate does. Hot chocolate would require more agitation than chocolate milk does. They would both require the same agitation. Neither would require any agitation.
Chocolate milk would require more agitation that hot chocolate dose.
Answer:
a
Explanation:
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
Question 1 (5 points)
In the image below, if the frisbee represents light, what does the fence represent?
Answer: a vacuum
Explanation: light travel as a wave but unlike sound waves or water it doesn’t need any matter or material to carry its energy along.this means that light can travel through a vacuum which means a completely airless space the wall is vacuum :) hope this helped
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.
I need urgent help for this
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.
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
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.
To learn more about earth, follow the link;
https://brainly.com/question/12041467
#SPJ2
what is the atomic number of helium
Answer:
2
Explanation:
Its atomic number is 2, so it has two protons in its nucleus.
Answer:
2
Explanation:
The atomic number for helium is 2.
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.
How many protons does Na have?
Answer:
11 protons
Explanation:
Answer:
11 protons
Explanation:
since it is neutral it has 11 electrons as well