When you light a match, there is a brief Smell that almost burns your nose
Answer:
Hdhgfrdf
Explanation:
Answer:
This is the smell of the smoke from the fire
Explanation:
A student builds a model of her bedroom. The scale is 1:25. In the scale model, the student's bed is 3 inches long. How long is the student's actual bed?
Answer:
75 inches
Explanation:
A student builds a model of her own bedroom
The scale of the model is 1:25
In the scale model the bed of the student is 3 inches long
Therefore the length of the student's actual bed can be calculated as follows
= 3 × 25
= 75 inches
Hence, the student's actual bed is 75 inches long
Select all the correct answers.
Which of the following are considered pure substances?
element
compound
homogeneous mixture
heterogeneous mixture
Element and compound both are considered as pure substances.
Thus, both option 1 and 2 are correct.
What is a pure substance?Pure substances are defined as materials with a consistent chemical composition that cannot be physically separated through the use of techniques like filtration, evaporation, etc.
Anything that is made up of the same atom or molecule throughout is a pure substance. Everything else is a mixture.
Since elements are not physically or chemically broken down to generate simple, tiny entities like zinc, elements and compounds are pure substances. Furthermore, pure substances like water are combined to create compounds.
Both homogeneous and heterogeneous mixtures are not pure substances since they lack predetermined ratios and proportions, making it difficult to identify their exact composition.
Pure substances include sodium, water, a copper wire, an aluminum foil, etc.
Thus, elements and compounds both are categorised as pure substances.
To learn more about pure substances, refer to the below link:
https://brainly.com/question/11134780
#SPJ2
Help me please I will mark it as brainliest. plzzz helppp...
Answer:
B. K= 2 , L= 4
D. K= 2 , L= 8 , M= 1
E. K= 2, L= 8 , M= 8
G. K=2 , L= 8, M= 8, N= 7
Answer:
hope it helps.
follow me..
Which of the following is true of science ?
Answer:Science is a systematic and logical approach to discovering how things in the universe work. ... True to this definition, science aims for measurable results through testing and analysis. Science is based on fact, not opinion or preferences. The process of science is designed to challenge ideas through research
Explanation:
Science is a systematic and logical approach to discovering how things in the universe work. ... True to this definition, science aims for measurable results through testing and analysis. Science is based on fact, not opinion or preferences. The process of science is designed to challenge ideas through research
Where does most of the mass of an atom come from? What parts of the atom make it up?
Answer:
nucleus
Explanation:
The majority of an atoms' mass comes from the protons and neutrons that make up its nucleus. Electrons are the least massive of an atom's constituent particles, with a mass of 9.11 x 10-31 kg and a size too small to be measured by current techniques.
what does 2 mean on MgBr2
Answer:
two means Br2
wat else................
Answer:
It means 1Magnesium and 2Bromine
How to we know how many neutrons are in the atoms we draw models for ? (We represent average atoms, not ions or isotopes)
Answer:
Atoms is the smallest unit of a chemical element and consist of three main components protons, neutrons, and electrons.
The number of a neutron is based on the difference between the mass number of the atom (M) and the atomic number (Z). every isotope of an element has a different number of neutron.
But in a neutral atom or average atom, the number of neutrons is equal to the number of protons and the number of electron.
Example of the number of neutrons in an average atom: In Nitrogen-14, the atomic number and the number of protons is 7, it means the number of neutrons will also 7.
Explain the general increasing trend in the first
ionization energies of the period 2 elements,
Li to Ne
Answer:
The general trend is for ionisation energies to increase across a period. In the whole of period 2, the outer electrons are in 2-level orbitals - 2s or 2p. ... That causes greater attraction between the nucleus and the electrons and so increases the ionisation energies.
Explanation:
The general trend is for ionisation energies to increase across a period. In the whole of period 2, the outer electrons are in 2-level orbitals - 2s or 2p. ... That causes greater attraction between the nucleus and the electrons and so increases the ionisation energies.
what does the scientific process include?
answer : need the purpose, a question to ask, you have to conduct background reasearh, an hypothesis, an experiment to conduct with a independent varable and a dependent variable, and your data and your analysis.
Explanation: i hope this helped and it's in my own words btw
What are the characteristics of a substance that can be observed WITHOUT changing the identity of the substance?
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
Answer: Physical Properties
Explanation:
Please select all thats apply.. A gas _____.
1.has a fixed volume
2.has a fixed shape
3.is difficult to compress
4.takes the shape of its container
5. has molecules with a lot of kinetic energy
Answer:
5
Explanation:
They have a lot of kentic energy as they move around
An isotope with a mass number of 193 has 116 neutrons. What is the atomic number of this
isotope?
f 12
in the
Answer:
Atomic number of this isotope = 77
Explanation:
Given that,
Mass number = 193
No of neutrons = 116
We need to find the atomic no of this isotope.
We know that,
Atomic mass = No of protons + No. of neutrons
Also, atomic no = no of protons
So,
Atomic mass = atomic no + No. of neutrons
⇒ Atomic no = Atomic mass - no of neutrons
Atomic no = 193 - 116
Atomic no = 77
Hence, 77 is the atomic no of the isotope.
Are the numbers 76.48cm, 76.47cm, and 76.59cm accurate or precise
Answer:
accurate
Explanation:
Someone help me please.. I will mark as brainliest I promise...
Answer:
(a) proton
(b) neutron
(c) electron
particles in nucleus are proton and neutron.
atom is electrically neutral because no.of proton= no.of electron=6
what may happen to eli and his father? check all that apply
They will not have to pay any cost because the accident was not Dave’s fault, Eli will be covered by Dave’s family car insurance policy, they will be protected by the other driver’s insurance. (B,C,D)
Explanation: just answered it and it was correct.
B. They will not have to pay any costs because the accident was not Dave’s fault.
C. Eli will be covered by Dave’s family car insurance policy.
D. They will be protected by the other driver’s insurance.
May I have brainliest please? :)
Which statement is true for photosynthesis? A) producers use it B) Consumers use it C) Scavengers use it D) Decomposers use it
Answer:
A) producers use it.
Explanation:
producers have to make their own food. so they use photosynthesis to make glucose for them to eat.
Answer: the answer is
Explanation: Bc is a very popular emoji
How many centimeters are there in 4.84 x 10 kilometers
Answer:
4,840,000 centimeters
Explanation:
why is gold considered matter?
Answer:
All matter is made up of substances called elements, which have specific chemical and physical properties and can't be broken down into other substances through ordinary chemical reactions. Gold, in this case, is an element so, therefore, it is considered matter.
Hope it helped :)
chemical properties can be what
there's 2 types what is 2 types of chemical properties ?
Chemical reaction - The chemical reactions are classified into different classes depending upon the type of chemical changes take place these reactions are as follows:
Combination reaction
Combination reaction - A reaction in which two are more reactance combined to form a single product is call combination reaction
calcium oxide reacts vigorously with water to form calcium hydroxide the reaction is highly exothermic a lot of heat is produced during the reactionCaO(s) + H2O(l) -------------- CH3OH(l)Decomposition Reaction
Decomposition reaction - aur reaction in which a single reactant breakdown to form two or more products is known as decomposition reaction this reaction is opposite to combination reaction on the basis of the form of energy required for the reaction this reaction of three types
thermal decomposition this reaction use the energy in the form of heat for the decomposition of reactantElectrolysis these reactions involves the use of electrical energy for the decomposition of the reactant moleculesPhotolysis these reactions involved the use of light energy for the purpose of decompositionDisplacement reaction
Displacement Reaction - when a more reactive element displays less reactive element from its compound it is called displacement reaction.This is of types.
Single displacement reaction - it is a type of chemical reaction where an element reacts with the compound and takes the place of another element in that compound is called single displacement Zn + cuso4 --------- ZnSO4 + cuDouble displacement reaction - the reaction in which two different oils or group of atom in the reactant molecules are displaced by each other is called double displacement reaction it is also called precipitation reaction as precipitate is produced in such reactionsOxidation and reduction
Oxidation - it is the process in which oxygen is added to a substance or hydrogen is removed from a substance
Reduction - it is the process in which oxygen is removed from a substance or hydrogen is added to a substance
Redox reaction - these are the reactions in which oxidation and reduction takes place simultaneously or call redox reaction
Endothermic and Exothermic
Endothermic - the reaction which are a complaint by the evolution of heat are called exothermic reaction all the reaction in which heat is released along with the formation of product are called exothermic reaction
Endothermic - the reaction which occur by the absorption of heat energy either in the form of light electricity are called endothermic reaction
Hope it helps u
Answer:
what is a chemical property
Explanation:
A chemical property is a property
What is the data collected from the independent variable called
Noah uses a thermometer to measure the temperature of some water as shown in the figure below.
What is the temperature on the Celsius scale?
Answer:
Whats the figure?
Explanation:
What is the SI unit for mass
Answer:
Kilogram as I said in the comments.
Explanation:
Answer:
kilogram! abbreviation: kg
Explanation:
A physical change is a change to a sample of matter in which -
some properties of the material change and the identity of the
matter also change.
TRUE
FALSE
Answer:
its FALSE
Explanation:
FAKE ITS NOT REAL
What are the properties of cathode rays?
The phrase “the danger is in the dose” is sometimes used when describing poisonous (toxic) chemicals. What does this mean?
The phrase “the danger is in the dose” means that sometimes it contains toxic chemicals too.
Poisonous (toxic) chemicals:The inorganic chemicals most commonly responsible for poisonings in the United States are cyanide, mercury, arsenic, and lead. While the last three often appear in chemical forms that are quite harmless, it is the soluble salts of the substances that are poisons. Cyanide is a dangerous substance in any form. Overdoses can happen at many opioid dose levels. For example, for instance if a patient drinks alcohol while on the medications, loses track of when they last took a dose, or takes more than the prescribed dose to handle a flare-up of pain.
Thus, we can say overdose can be the danger in the dose.
Find more information about Toxic chemical here: brainly.com/question/17011368
140000 rounded to 3 sig gigs
Answer:
Please write your completely question.
Which of the following shows the levels of organization in correct order
from the simplest to the most complex? *
0 Organisms, cells, populations, molecules, ecosystems
Ecosystems, populations, organisms, cells, molecules
Molecules, cells, organisms, populations, ecosystems
O Molecules, organisms, cells, populations, ecosystems
Answer:
I think it's the second one but I'm not completely sure
Cirular movement of molecules rising up and sinking down is called
A. Coriolis effect
B. Wind movement
C. Convection movement
8 mm =
Cm
What’s the answer to that???
Answer:
0.8 cm
Explanation:
If 1mm is 0.1 cm, then
8mm is 0.8 cm since 8 * 0.1 is 0.8
