Answer:
The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
Explanation:
What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s
Answer:
What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s?1,5625J
the closeness of a measurement to its actual value is a measure of its
A. usefulness
B. reproducibility
C. precision
D. accuracy
Which type of reaction has will give brainliest to first correct answer
the general formula of AB + CD → AD + CB?
ОООО
synthesis
decomposition
oxidation
replacement
Answer:
I think it's replacement because the B and D just swap places in the end equation
Answer:
that would be replacment
Explanation:
if you look at the formula the B and D are replaced with each other
synthesis is when it looks like A+B--> AB
decompositions looks like AB--> A+B
and oxydation is when the states of atoms are changed so it would include things like +1, -1 etc
will someone help me, please
Answer:
c makes sense
Explanation:
if your just sitting there looking at it melt, thats not helping
Answer:
A
Explanation:
Different sizes of ice cubes will result in different lengths of time in staying solid. A bigger ice cube will stay solid for longer than a smaller one.
When ammonium chloride is dissolved in water, the beaker gets cold. Which type of reaction does this describe
O exothermic
O endothermic
O both exothermic and endothermic
O neither exothermic nor endothermic
Answer:
B
Explanation:
i think with exothermic reactions heat is released
this is what i looked up
hope this helps i took chem last year and think this is what i learned
Considering the definition of exothermic and endothermic reactions, the correct answer is second option: the reaction is endothermic.
Energy and chemical reactionsEnergy is the ability to do work or to produce heat.
Remembering that chemical reactions involve a reorganization of atoms between substances with breaking or formation of chemical bonds, this formation or breaking of chemical bonds is accompanied by changes in the energy of the system.
Exothermic reactionsChemical reactions that release heat are called exothermic. That is, an exothermic reaction is one where energy flows out of the system.
So, at room temperature, the heat released by a chemical reaction is enough to cause a rise in temperature.
Endothermic reactionsAn endothermic reaction is one that requires heat to take place. In other words, a chemical reaction is endothermic when it absorbs energy from the environment.
In this case, the heat is transferred from the outside to the inside of the system. By absorbing heat, the effect of an endothermic reaction is to lower the temperature.
This caseWhen ammonium chloride is dissolved in water, the beaker gets cold. That means the system is absorbing heat from the surrounding and the temperature does down.
So, the correct answer is second option: the reaction is endothermic.
Learn more about endothermic and exothermic reactions:
https://brainly.com/question/4345448?referrer=searchResultshttps://brainly.com/question/11753370?referrer=searchResultshttps://brainly.com/question/18523044?referrer=searchResultshttps://brainly.com/question/9799465?referrer=searchResultshttps://brainly.com/question/4364765?referrer=searchResultsA graduated cylinder is filled with 50.7 mL of water. If a 10.0 g piece of zinc metal is added to the water, and the volume rises to 52.1 mL, what is the density of the metal?
Answer:
The answer is 7.14 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 10 g
volume = final volume of water - initial volume of water
volume = 52.1 - 50.7 = 1.4 mL
We have
[tex]density = \frac{10}{1.4} \\ = 7.142857...[/tex]
We have the final answer as
7.14 g/mLHope this helps you
____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.
What are the total balance electrons?
PHOTO ABOVE
Answer: H2O has 8 electrons, GeBr4 has 32 electrons, and RbHO has 37 electrons.
Hope this helped! :)
what is the form of
energy that
refers to the
motion of
particles
_________energy is stored in chemical bonds.
Answer:
Chemical energy is the potential energy stored in the arrangement of atoms within molecules. Breaking chemical bonds requires energy, while forming new chemical bonds releases energy. The more energy that's released when a bond forms, the more stable that bond is.
Explanation:
1.) Nonmetallic elements form ions by (Losing/Gaining) valence electrons in order to complete their outer shell. 2.) The (Fewer/More) valence electrons an element has in its outer shell, the easier it is to complete. 3.) The (FewerMore) electron shells an element has, the easier it is to fill its outermost shell. 4&5.)Reactivity in nonmetals (Increases/Decreases) as you go from left to right in a group, and (Increases/Decreases) as you go from top to bottom.
Answer:
1) Gaining
2) More
3) More
4) increases
5) decreases
Explanation:
Nonmetals are found towards the right hand side of the periodic table. They form ions by gaining electrons due to the fact that they have more electrons in their outermost shell, hence they only need a few electrons to complete the octet structure.
As the number of shells increases, the outermost shell becomes more populated and easier to fill with electrons.
The reactivity of nonmetal elements generally increases from left to right across the periodic table but decreases from top to bottom down the group.
Answer:
1) Gaining
2) More
3) fewer
4) increases
5) decreases
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
the food into energy for her muscles? *
O thermal
O physical
O chemical
Answer:
chemical
Creatine Phosphate (with oxygen) So all muscle cells contain a high-energy compound called creatine phosphate which is broken down to make more ATP quickly. Creatine phosphate can supply the energy needs of a working muscle at a very high rate, but only for about 8–10 seconds.adenosine triphosphate (ATP)
The source of energy that is used to power the movement of contraction in working muscles is adenosine triphosphate (ATP) – the body's biochemical way to store and transport energy. However, ATP is not stored to a great extent in cells
A 6-mile wide meteorite hit the earth 65 million years ago. Scientists have found a high concentration of iridium in the sedimentary clay layer from this time period. Iridium is very rare in Earth’s crust, but it is abundant in meteorites. Scientists believe this impact caused the extinction of the dinosaurs. Which of these statements correctly describes whether this is a theory or a law and why?
A. It is a law, because it includes a numerical analysis.
B. It is a law, because it explains all causes of animal extinction.
C. It is a theory, because it explains the cause of the dinosaur extinction.
D. It is a theory, because it shows regular patterns from a generalization of the data.
1. Which one of the following best describe sublimation?
A. A solid melting to a liquid which re solidifies.
B. A solid melting to a liquid which evaporates, the vapor condensing to a liquid and then recrystallizing.
C. The movement of gaseous particles so that they fill the spaces that they occupy.
D. A solid forming a vapor on heating and reforming as a solid on cooling.
E. The bombardment of large molecules by small molecules.
Answer:
i think it is D.
Explanation:
The answer is D because it’s where a solid turns to a gas without going through a liquid phase if that makes sense
How do ionic bonds differ from covalent bonds?
Protons are transferred in an ionic bond.
Protons are shared in an ionic bond.
Electrons are shared in an ionic bond.
Electrons are transferred in an ionic bond.
Answer:
Electrons are transferred in an iconic bond.
Which is it , if you are right I will give brainliest
Answer:
a
Explanation:
Question 4(5 points)
(01.07 MC)
A student compares the boiling point of substances having different intermolecular forces. Which independent variable did the student most
likely use? (5 points)
Ob
Various compounds made of different forces between molecules
Type of source used to heat up the substances
Type of container used for the substances
Boiling points of various substances
Od
Answer:
Various compounds made of different forces between molecules
Explanation:
In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter in order to effect a measurable response.
According to this question, a student compares the boiling point of substances having different intermolecular forces. This means that the student uses different substances with different intermolecular forces and measures the boiling point of each, which depends on the intermolecular forced in them. Hence, the independent variable in this experiment is the VARIOUS COMPOUNDS MADE OF DIFFERENT FORCES BETWEEN MOLECULES.
Which of the following best describes an electron?
A. It has no charge and about the same mass as a proton.
B. It has a negative charge and much less mass than a proton.
C.It has a positive charge and much more mass than a neutron.
D.It has a negative charge and about the same mass as a neutron.
Answer:
It's D. because it has negative charge and same mass as neutrons
what is the density of a man
Answer:
1.0 g per cubic centimeter.
Explanation:
Can someone please help me I really need help
Answer:
atoms from different elements
Please help, and can you tell, if some my answers are correct?
Calculate the density of a piece of mass of metal. The rectangular piece of solid metal has the measures of 2.0 cm 3.0 cm in 2.0 is the unidentified
metal has a mass of 40
Answer:
Density = (3.33kg or g)/cm³(since you didn't state the unit of the mass)
Explanation:
volume = length × breath × height
let's take it as,
length = 2.0cm
breath = 3.0 cm
height = 2.0 cm
mass = 40 kg or g (since you didn't state the unit of the mass)
volume = ?
volume = length × breath × height
volume = (2 × 3 × 2)cm
volume = 12 cm³
Density = mass /volume
40kg or g/12cm³
Density = (3.33kg or g)/cm³(since you didn't state the unit of the mass)
Explain how cooking is a real
world example that models how
the atoms from the reactants
rearrange and come together in
different arrangements to form
new substances.
Answer:
Explained below
Explanation:
In chemistry, the process of a chemical change is when the atoms from the reactants rearrange themselves and bond together differently to form one or more new substances with different characteristics than the reactants. Now, after this new substance is formed, the change is called a chemical change.
Now, in cooking Food will undergo a chemical change as it is being cooked. For example, when we boil brown meat, we are causing reactions that change the chemical composition in ways that enhance flavors. Proteins and fibers such as beans when cooked are broken down or undergo denaturation thereby making digestion easier when eaten. Fats like cooking oils are melted while Eggs when boiled are coagulated.
At what time of day is sunlight strongest - in the early morning (when the Sun has just risen)
or at noon (when the Sun reaches its highest point)?
Answer:
noon is the answer. Hope it helps
Answer:
Noon
Explanation:
Hope this helps <3
Help QUICK!!
Why is scientific notation used?
A. to round numbers to the nearest whole number
B. to promote reproducibility of data
C. to increase the validity of data
D. to express very large or very small numbers
Answer:
c.to increase the validity of data
Answer:
i think its D
Explanation:
pls tell me if im wrong
How many significant figures in 0.002010 ?
Decreasing the volume of a gas increases the pressure of the gas. .
Answer:
False.
Explanation:
If the gas is leaving it cannot have higher pressure.
A particle that orbits the nucleus in an atom is called a(n)
electron
proton
neutron
When vinegar, an acid, is mixed with baking soda, a base, the reaction is similar to the reaction of Alka-Seltzer and water; a salt, water and carbon dioxide are produced. In two or more complete sentences, describe how your knowledge of balancing chemical equations can help you to determine the missing compound. Write your answer in the essay box below. NaHCO3 + HC2H3O2 ⟶ ________ + H2O + CO2
Answer:
no.
Explanation:
you're prolly wondering why cuz this is revenge for your little game you did to me and whoops! i don't know the answer :) !
