Answers
Related Questions
If I walk 10 meters down the hallway, then 2 meters into a classroom, what is my total distance walked in meters(write the number)
Answers
Answer:
12 meters
Explanation:
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which option is an example of a physical change??
A breaking chemical bonds
B forming chemical bonds
C nuclear decay
D melting a substance
which option is an example of a chemical change
A ironing a shirt
B melting cheese
C grinding powder
D fireworks exploding
Answers
Answer:
D
Explanation:
Melting of ice is a physical change as there no new compound is forming only state is changing So Option D is correct option. For second question Option D is correct option as combustion reaction is taking place.
What is chemical change?Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same
One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature. Physical change is just opposite of chemical change. Phase change is an example of physical change.
Thus option D is correct option in both cases.
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Question 1 (4 points)
Which of the following is/are true about Van der Waals forces?
A. They are very weak
B. They are a a type of momentary dipole
C. Both 1 and 2 are correct
D. neither 1 nor 2 is correct
Answers
Answer:
C. Both 1 and 2 are correct.
ANSWER FAST PLEASE!!
Which is a true statement about a zero net force?
A zero net force causes a change to an object’s direction.
B.zero net force causes a change to an object’s speed.
C.A zero net force causes a change to an object’s acceleration.
D.A zero net force causes no change in an objects motion.
Answers
Answer:
D)a zero net force causes no change in an objects motion.
A zero net force causes no change in an object's motion. This statement is true about zero net force. Therefore, option D is correct.
What is zero net force ?An item that is originally at rest and has no net forces operating on it will stay at rest. If it is going, it will keep moving straight forward at a consistent speed. Forces are "pushes" or "pulls" on the object, and they are vector numbers, just like acceleration and velocity.
A automobile travelling at 50 mph on a highway continually has a net force of zero even though it is moving, since there is no acceleration and the speed is constant.
The total net force acting on an object as it moves at a steady speed is always zero. If you apply force, friction or another force (or several forces) will balance it out.
Thus, option D is correct.
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the sum of all the kinetic energies of an object is it's
Answers
Answer:
The sum of potential energy and macroscopic kinetic energy is called mechanical energy and stays constant for a system when there are only conservative forces (no non-conservative forces). The more mass a moving object has, the more kinetic energy it will possess at the same speed.
Explanation:
Answer: Mechanical energy
Explanation: The more mass a moving object has, the more kinetic energy it will possess at the same speed
Is hydrogen a metal or a nonmetal? How many valence electrons does a hydrogen atom have?
Answers
Answer:
hydrogen is a non-metal, and has one valence electron.
Explanation:
Hope this helps!!
Hydrogen shows properties of both metals and nonmetals. However, hydrogen is placed with the alkali metals since it contains one valence electrons.
What is hydrogen ?Hydrogen is the first element in the periodic table. It has only one electron and it is the valence electron of hydrogen. Therefore, hydrogen is placed in the first group of periodic table.
Hydrogen needs one more electrons to become stable. The 17th group elements halogens also have a valency of one. Hence, hydrogen shows some chemical similarities with halogens also.
Mostly hydrogen forms covalent bonds like non-metals and in rare cases, hydrogen forms ionic bonds by donating its electron. Therefore, hydrogen is mostly considered as a non-metal.
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Why is it important for you to know the properties and chemical formulas of molecular and ionic compounds? How will this affect your ability to choose one product over another or make decisions about whether to use a certain substance like bleach or drain cleaner? How has learning about atomic structure and compounds changed your understanding of the world around you?
Answers
Answer:
See explanation
Explanation:
It is important to know the properties and chemical formulas of ionic and molecular compounds because, knowledge of the properties of a compound aids you in deciding how to use the compound, how to store it and how dangerous it can be. Knowledge of its formula is the first step towards identifying its properties since most chemicals occur in groups having similar chemical/physical properties.
Knowledge of the chemical properties and formula of bleach and drain cleaner will help you to decide which product is a better cleaning agent based on its chemical composition. This will help you as the user to make better decision.
Learning about atomic structure has made me to understand that all matter in the universe are composed of atoms. indeed, certain occurrences in nature can only be explained on the basis of atoms involved.
A piece of aluminum has a mass of 12.0 g. When it is placed into a graduated
cylinder with 14.0 mL of water, the water level rises to 18.5 mL. What is the density
of aluminum?
0 2.66667g/ml
O 2.67 g/mL
O 2.667g/mL
O 2.7 g/mL
Answers
Answer:
The answer is 2.7 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 12 g
volume = final volume of water - initial volume of water
volume = 18.5 - 14 = 4.5 mL
So we have
[tex]density = \frac{12}{4.5} \\ = 2.66666666...[/tex]
We have the final answer as
2.70 g/mLHope this helps you
If all the deer disappeared from this community, which change would be most
likely to occur?
Answers
Answer:
i think the grass population would decrease
Explanation:
Answer:
The Coyote population would decrease
Explanation:
The number of protons in an element can be found by looking at the
symbol
atomic number
O average atomic mass
O name
Answers
Answer:
atomic number if it's a answer
Answer:
I think its the average atomic mass.
Explanation:
How long does one complete orbit of Earth around
the sun take, give the amount in years and days?
Answers
Answer:365 days, 5 hours, 59 minutes and 16 seconds.
How many protons are there in a neutral, stable Hydrogen atom that makes up 99.985% of the element?
A. 1
B.2
C.3
D.4
E.0
Answers
Why were enslaved Africans in high demand in the southern colonies?
Answers
Answer:
Slaves were in high demand in the southern colonies because they were the main source of labor. ... Bacon and others colonists wanted to take the Natives land.
Explanation:
HOPE THIS HELPED ❤✨
What all indicates a CHEMICAL change? *
A Solid melting into a liquid
After the change the substance is still reactive with oxygen
One substance becomes two new substances
The melting point was 100 deg C but after the change the melting point was 256 deg
C.
Answers
one substance becomes two new substances
How many bromine atoms are present in 38.7 g of CH2Br2
Answers
Number of Br atoms : 2.679 x 10²³
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt mol=\dfrac{mass}{MW}[/tex]
Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
mass of Br in CH₂Br₂[tex]\tt mass~Br=\dfrac{2.Ar~Br}{MW~CH_2Br_2}\times mass~CH_2Br_2\\\\mass~Br=\dfrac{2.80}{174}\times 38.7=35.59~g[/tex]
mol of Br[tex]\tt \dfrac{35.59}{80}=0.445[/tex]
number of atoms[tex]\tt 0.445\times 6.02\times 10^{23}=\boxed{\bold{2.679\times 10^{23}}}[/tex]
If you were to decrease thermal energy, what would happen to the particles?
Answers
Answer: Explanation:
You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster (increased kinetic energy). Particles get farther apart (increased potential energy).
The unknown element (Johnsonium, Jo) contains three naturally occurring isotopes. The relative abundances and atomic mass are:
Moorium-36: abundance = 1.32%, mass = 35.978amu
Moorium-38: abundance = 3.25%, mass = 37.963amu
Moorium-40: abundance = 95.43%, mass = 39.962amu
What is the average atomic mass of "Moorium?"
Answers
Answer:
Average atomic mass of moorium is 39.844 amu.
Explanation:
Given data:
Atomic mass of moorium-36 = 35.978 amu
Relative abundance of moorium-36 = 1.32%
Atomic mass of moorium-38 = 37.963 amu
Relative abundance of moorium-38 = 3.25%
Atomic mass of moorium-40 = 39.962 amu
Relative abundance of moorium-38 = 95.43%
Solution:
Average atomic mass moorium = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)+ (abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass of moorium = (1.32×35.978)+(3.25×37.963)+(95.43×39.962) /100
Average atomic mass of moorium = 47.491 + 123.380 +3813.574 / 100
Average atomic mass of moorium = 3984.445 / 100
Average atomic mass of moorium = 39.844 amu
How does the snake's skull allow it to eat large prey?
A. The jaw can crush the prey,
B. The teeth can grind the prey.
O C. The jaw can open wide around the prey.
D. The teeth can lock together around the prey,
Answers
What strategy should be done to provide quality education without discrimination?
Answers
Explanation:
The Committee has already adopted general comment No. ... Non-discrimination - education must be accessible to all, especially the most ... developmental strategy for its school system.as poverty and discrimination and to provide education of sufficient quality, in a manner that ensures children can benefit from it.
A student redid the experiment of mixing room-temperature water and warm
water. This time, she doubled the amount of room temp water. How will the final
temperature be different?
A- It will be higher, because the amount of water in the mixture is greater.
B-It will be lower, because the temperature of the room-temperature water will not increase as much.
C-It will be the same because all parts of the mixture will end up at the same temperature.
D-It will be higher, because all parts of the mixture will end up at the same temperature.
Answers
Answer:
B) It will be lower, because the temperature of the room-temperature water will not increase as much.
Explanation: I took the test
Is sulfur dioxide a element?
Answers
yes it is a element.
Convert this mass to SI Unit: 2000g
Answers
Answer: 2 kg
Explanation:
Identify and give an example of at least two molecular properties that could be used to separate a substance from a mixture.
Answers
Answer:
Two molecular properties that could be used to separate a substance from a mixture are - Filtration and Chromatography .
Explanation
Molecular property -Molecular properties include the chemical properties, physical properties, and structural properties of molecules, including medicines. Typically, molecular properties do not include a chemical compound's pharmacological or biological properties.
Filtration -: Using a filter medium that allows the fluid to move through but not the solid, filtration is a method used to distinguish solids from liquids or gases. The term 'filtration' refers whether the filter is mechanical, chemical, or physical. The filtrate is considered the fluid that flows through the filter. A surface filter, which is a solid that traps solid particles, or a depth filter, which is a bed of material that traps the solid, may be the filter medium.Usually, filtration is an imperfect operation. On the feed side of the filter or embedded in the filter media, some fluid remains and some tiny solid particles make their way through the filter.
example - Filters containing fibers that trap particulates are used by many aquariums.
Chromatography -: A laboratory method for the isolation of a mixture is chromatography. The mixture is dissolved in a fluid called the mobile phase (gas, solvent, water) that carries it through a device (a column, a capillary tube, a plate, or a sheet) on which a material called the stationary phase is fixed. For the stationary step, the different constituents of the mixture have different affinities.Chromatography can be analytical or preparatory. Preparative chromatography is intended to isolate the components of a mixture for subsequent use and is therefore a method of purification. Analytical chromatography is usually conducted with smaller quantities of material and is intended to assess the presence of analytes in a mixture or to measure their relative proportions. Both are not limited to each other.
An example of chromatography is when a chemical reaction is used to separate each of the various sized molecules on a piece of paper in a liquid compound into their own pieces.
Hence , the answer is filtration and chromatography .
what is the mass of an atom if it has 11 protons, 12 neutrons, and 11 electrons
A,22, B.23, C34, D 11
Answers
Answer:
23, B
Explanation:
The mass of an atom is determined by the number of Protons + Neutrons. Here, if we assume the units is AMU (Which means the mass unit for a proton and neutron would be basically 1), the answer would be 11 + 12 = 23 AMU, which is B.
Answer:
B) 23
Explanation:
Relative Mass = number of protons + number of neutrons
Relative Mass = 11 + 12
Relative Mass = 23
0.0
A loaf of bread has a mass of
250.0 g and a volume of
2,575 cm3. What is the
density of the bread?
cm3
10
1
Answers
Answer:
0.097 g/cm3
Explanation:
divide mass over volume
The mass of an atom Is found by adding Its protons and .The electric charge of an atom Is found by adding the charges carried by Its protons and .
Answers
Answer: the 1st answer is neutrons and i think the 2nd is nucleus
Explanation:
The mass of an atom is found by adding its protons and neutrons. The electric charge of an atom is found by adding the charges of its protons and electrons.
What is atomic mass?The atomic mass of an element is the total number of protons and the number of neutrons carried by one atom of that element. The atomic mass of an element is usually expressed in grams or a.m.u.
The atomic mass of an element = No. of protons + No. of neutrons
or
The atomic mass of an element = No. of electrons + No. of neutrons
The atomic number gives us information about how many protons are inside the nucleus of the atom. Elements are recognized by the number of protons in the nucleus. Neutrons are uncharged elementary or subatomic particles that are stable when bound in an atomic nucleus.
As the electrons and protons are charged particles in an atom, therefore, the sum of the charge carried by them is equal to the electrical charge of the atom.
For a neutral atom, the number of protons present in an atom is always equal to the number of electrons.
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Plz help! This question is due in 10 mins!
Calculate the density of a 5cm3 cube of iron with a mass of 100 g
Answers
Answer: 20
Explanation: I’m in your class.
can anybody help me? ill mark brainliest!!! please ITS TIMED
Answers
Density = Mass/Volume but it can also be rearranged to:
Mass = Volume x Density
Given in the question:
Volume - 44.9 cc
Density - 19.3 g/cc
Calculation
Mass = Volume x Density
= 44.9 x 19.3
= 866.57 g
What is the proof of the chemical reaction?
Answers
Answer: The chemical is disrupted, also most likely causing an explosion.
Explanation:
Human body uses the energy provided from food digestion. Endothermic or exothermic?
Answers
Answer:
Endothermic
Explanation:
Exo is outside so exothermic would be outside the body
The carbohydrates are break down into glucose. Then glucose combines with oxygen in the cells and provides energy. Hence, digestion is an exothermic process.
What is an exothermic process ?Food digestion produces heat. This happens as a result of the organism releasing heat during meal digestion. A process that releases heat is exothermic.
Heat is released during an exothermic reaction, raising the temperature of the immediate environment. The environment is cooled through an endothermic process that absorbs heat.
Glucose is created by the breakdown of these carbs. In the cells of our body, this glucose interacts with oxygen to produce energy. So, the process of digesting is exothermic.
Chemical processes involved in food digestion disassemble large food molecules into smaller, more manageable "building block" components.
Thus, Human body uses the energy provided from food digestion is exothermic process.
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