Answer:
it s not on periodic table this is not real element
Explanation:
Can someone please help me I really need help
Answer:
atoms from different elements
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=searchResultsThere are two kinds of mixtures, homogenous and heterogenous. Homogenous mixture is the mixture that has uniform composition, while heterogenous mixture does not have a uniform composition.
A. True
B. False
Answer:
True
Explanation:
Homo = same
Hetero = different
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.
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! :)
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.
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 :) !
are we made of star dust? why or why not
Answer: Technically, yes. Are bodies are primarily made of carbon, which is found in pretty much everything. Stars, planets, plants, etc.
Explanation:
Nuclear power plants are very hazardous because their fuel and waste products are highly
radioactive.
a True
b. false
Answer:
the answer is A
Explanation:
This is very much true as seen by the fact that the people that work at nuclear power plants usually have to wear radiation suits.
Synthetic materials depend on what? I need 3 different answers.
A 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
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
2a. Density is the relationship between mass and volume. Density has
many uses but is most commonly used to help determine the identity of
an unknown substance. Specifically for copper the proportion is
approximately 8.96 grams for every mL of copper. Approximately how
much volume (mL) would 29 grams of copper have? While it is helpful for
you to show all work, you MUST provide rationale for your thinking and
explanation for each of your steps.
The volume of copper : 3.24 ml
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of mass
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large{\boxed {\bold {\rho~=~ \frac {m} {V}}}}[/tex]
ρ = density , g/cm³ or kg/m³
m = mass , g or kg
v = volume , cm³ or m³
A common example is the water density of 1 gr / cm³
The density of copper : 8.96 gr/ml
mass of copper : 29 g
then the volume :
[tex]\tt V=\dfrac{m}{\rho}\\\\V=\dfrac{29~g}{8.96~g/ml}\\\\V=\boxed{\bold{3.24~ml~or~3.24~cm^3}}[/tex]
The difference in the direction is caused by the ______________.Please help!
What is a term for the forces that two objects exert on each other?
Answer:
action-reaction force.
Explanation:
the pair of opposite but equal forces that two objects exert on each other. weight. the gravitational force exerted by a large body, usually Earth, on an object.
Answer:
exerted forces
Explanation:When an object has several forces acting on it, the effects of force is same as one force acting on the object in a certain direction and this overall force is called the ‘resultant force’.
Question 9/10
As a boulder rolls from the top of a hill to the bottom, how does its potential and kinetic energy change?
A. Potential and kinetic energy both increase.
B. Potential increases and kinetic decreases.
C. Potential decreases and kinetic increases.
D. Potential and kinetic energy both decrease.
please help quickly
c. Potential decreases and kinetic increases.
Explanation:
As the boulder is rolling down the hill, potential energy decreases as kinetic energy increases.
what is the form of
energy that
refers to the
motion of
particles
Please help, and can you tell, if some my answers are correct?
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
____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.
the closeness of a measurement to its actual value is a measure of its
A. usefulness
B. reproducibility
C. precision
D. accuracy
Assess It!
#4
Which two elements are
most likely to bond with
each other?
A. Oxygen and Boron
B. Nitrogen and 3 atoms of
Hydrogen
C. Chlorine and Calcium
D. Neon and Sodium
Answer:
c
Explanation:
i hope this helps
The two chemical elements that are most likely to bond with each other are: C. Chlorine and Calcium.
A chemical bond refers to the forces of attraction existing between ions, crystals, atoms or molecules and that are typically responsible for the formation of new chemical compounds.
In Chemistry, there are three (3) main types of chemical bonds and these are:
I. Hydrogen bonds.
II. Covalent bonds.
III. Ionic bonds.
An ionic bond can be defined as a chemical bond which involves a metallic element transferring one or more electrons to a non-metallic element.
In this scenario, the element Chlorine which have seven valence electrons would accept an electron from Calcium (Alkali metal) to form a chemical compound called calcium chloride.
In conclusion, two chemical elements that are most likely to bond with each other by forming an ionic bond are Chlorine and Calcium.
Read more: https://brainly.com/question/24605723
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)
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 particle that orbits the nucleus in an atom is called a(n)
electron
proton
neutron
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.
PLEASEEE HELPPP!!!! AND EXPLAIN PLS
Answer: True?
Explanation: THere is no question but I do know that is true because I answers that on a test and got it right. It was asking about:
how many Helium and oxygen molecules = H2O = + O2
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.
Pleaseeee help neeeeee
Answer:
B
Explanation:
Condensation happen when water is warmed up in room temperature against a cold surface like water vapor
To find out if the height from which a student drops a ball affects how high the ball bounces, the independent variable is the
Answer:
The independent variable is the height of the ball that bounces.
