Answer:
The mass will not change during a chemical reaction.
Explanation:
What is the density of an object that has a mass of 45g and a volume of 9mL?
ASAP!!
Answer:
312140 LB/CU FT
Explanation:
MULTIPLY
please help, will give brainliest
Answer:
Explanation:
chemical change is a change where mew substance is formed
A compound is known to contain 15% sulfur.
What mass of sulfur does this correspond to if there is a total of 200g of the compound containing sulfur?
Answer:
30g
Explanation:
According to this question, a sulfur-containing compound is said to contain 15 percent by mass of sulfur. This means that 15% of the total mass of the compound is the mass of sulfur in the compound.
The question further states that there is a total of 200g of the compound containing sulfur, this means that the mass of sulfur can be calculated this:
Mass of sulfur = 15% of 200g
15/100 × 200g
15 × 2
30g
Hence, there are 30g of sulfur in 200g of the sulfur containing compound.
Which of the following IS NOT an ionic compound?
A) C2H5OH
B) KCI
C) Mg3N2
D) MnO2
For a reaction, AH = 198 kJ. For which value of TA Sis the reaction spontaneous?
Answer:
ah+j
Explanation:
what is one of the most common elements in living things.
WILL MARK BRAINLIEST
*please answer correctly*
I’ve been stuck on this question for a while so I’d appreciate it
Iwhich
of the following is an ionic compound?
a. HCl(aq)
b. KClaa
C. C103(g)
d. NCl3
Answer:
KCl is an Ionic compound
Explanation:
Calculate the energy of light with a frequency of 5.21 x 104 Hz
Answer:
3.45*10^-29
Explanation:
E=hv
h is Planck's constant and v is the frequency (which was given to us)
E=6.626*10^-34 * 5.21*10^4
E=3.452146*10^-29
Nucleus Nucleus Atom 1 Atorn 2 Nucleus Nucleus Atom 3 Atom 4 Which two atoms are of elements in the same group in the periodic table?
Explanation:
The atoms of elements on the same period on the periodic table typically have the same number of valence electrons.
They have the same electronic configuration.
Valence electrons are electrons in the outermost shell of an atom.
The number of electrons in an atom is a good indicator of elements that might potentially belong to the same group.
What happens to the charge if a nonmetal
takes two valence electrons?
Answer:
if a non-metal takes two valence electrons then it get negatively charged to form ion.
Answer:
The nonmetal will gain a negative charge of magnitude 2
Explanation:
X be the nonmetal
On gaining two electrons
X^2-
The radioisotope technetium-99 is often used as a radiotracer to detect disorders of the body. It has a half-life of 6.00 hours. If a patient received a 20.0 mg dose of this isotope during a medical procedure, how much would remain 24.0 hours after the dose was given?
Answer:
[tex]0.25\ \text{mg}[/tex]
Explanation:
[tex]t_{1/2}[/tex] = Half-life of technetium-99 = 6 hours
[tex]N_0[/tex] = Initial mass of sample = 20 mg
[tex]t[/tex] = Time elapsed = 24 hours
Amount of mass remaining is given by
[tex]N=N_0e^{-\dfrac{\ln 2}{t_{1/2}}t}\\\Rightarrow N=20e^{-\dfrac{\ln 2}{6}\times 24}\\\Rightarrow N=0.25\ \text{mg}[/tex]
The amount of the sample that would remain is [tex]0.25\ \text{mg}[/tex].
Areas near large bodies of water tend to have which type of climate
Answer:
mild
Explanation:
Identify the correct equilibrium constant expression for this equation:
2 upper N upper O (g) plus upper O subscript 2 (g) double-headed arrow 2 upper N upper O subscript 2 (g).
K subscript e q equals StartFraction StartBracket upper N upper O EndBracket superscript 2 StartBracket upper O subscript 2 EndBracket over StartBracket upper N upper O EndBracket superscript 2 EndFraction.
K subscript e q equals StartFraction StartBracket upper N upper O subscript 2 EndBracket superscript 2 over StartBracket upper N upper O EndBracket superscript 2 StartBracket upper O subscript 2 EndBracket EndFraction.
K subscript e q equals StartFraction StartBracket upper N upper O EndBracket over StartBracket upper N Upper O subscript 2 EndBracket StartBracket upper O subscript 2 EndBracket EndFraction.
Answer:
First Option: B)
Second Option: C)
The pictures below will show the answers. The first picture is the first option, and the second picture is the second option.
Answer:
Question 1 : B
Question 2: C
Explanation:
Hope this helps!
Edge 2022
i am so bad at chemistry please help if u know..!
Explanation:
try solving by using molecular formula.
you've asked this so many times
Describe the paper
chromatography in short.
Answer:
Paper chromatography, in analytical chemistry, technique for separating dissolved chemical substances by taking advantage of their different rates of migration across sheets of paper. It is an inexpensive but powerful analytical tool that requires very small quantities of material.
Explanation:
Hope it is helpful....
PLS HELP!! it’s science how do waves travel through gas
By 'waves' do you mean sound waves? If so sound waves need to travel through things like solids, liquids and yup gases. When the waves travel they are vibrating the molecules in the matter. By doing this he molecules in solids are packed very tightly.
To calculate acceleration you must know both the objects velocity and _______________ 1pt
Answer:
i think its speed
Explanation:
Answer:
Velocety and mass
Explanation:
If the arrows below indicate the path of a beam of light, which diagram shows an example of reflection?
Answer: bot sure
Explanation:
1. Look up bromine on the periodic table. What is the most common isotope of bromine?
Answer:
The most common isotope is Bromine-79.
Explanation:
If a car traveling at 75 mph west, changes its direction to east, does its acceleration change?
yes or no (1pt)
and explain why you chose the answer
Answer:
No because it changes velocity, instead of accelerating
Explanation:
and yes, I am in K12 ツ
Answer:
no
Explanation:
it changes velocity, instead of accelerating
What are groups on the periodic table? How many are there?
Explanation:
Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.
Answer:
The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups.
If extinction is a normal part of ecosystems, and mass extinctions have happened before, why should humans be concerned about the rising extinction rate? What do current extinctions tell us about our impact on modern environments?
Answer:
we're terrible at keeping the earth clean and we know that lol
Explanation:
idrk
Humans should be concerned about the rising extinction rate as this accelerated rate prevents ecosystems from recovering or other species from filling voids in the food chain.
What is extinction?Extinction is the final phase of a sort of creature or a taxon—typically a species. Although the ability to reproduce and bounce back may have been lost earlier, the death of the last member of the species is typically considered to have been the moment of extinction.
Determining this point is challenging because a species' dynamic value may be quite wide, and is typically done after the fact. Due to this problem, there are phenomena like Lazarus taxa, in which a species that was thought to be extinct suddenly "reappears" after a duration of apparent absence. If extinction is a normal part of ecosystems, and mass extinctions have happened before, humans should be concerned about the rising extinction rate as this accelerated rate prevents ecosystems from recovering or other species from filling voids in the food chain.
Therefore, humans should be concerned about the rising extinction rate as this accelerated rate prevents ecosystems from recovering or other species from filling voids in the food chain.
To know more about extinction, here:
https://brainly.com/question/11872946
#SPJ7
How many grams of water are produced from 0.198 grams of nitric acid?
2HNO3+Mg(OH2) = Mg(NO3)2+2H2O
Answer:
2+2H2O.We already learn it
In continuing to think about the rock cycle, we know the phases can take thousands, even millions of years to occur. Which stage in the cycle can happen in mere hours or days?
a. Lithification and Erosion
b. Heat and pressure
C. Compaction and weathering
d. Cooling & Crystallization
Answer:
d. Cooling & Crystallization
Explanation:
One of the stages of the rock cycle that can take place under mere hours or days is cooling and crystallization.
Cooling and crystallization of lava on the earth surface is a very rapid and fast process.
When magma from within the earth reaches the surface, it becomes lava. Due to the nature of the surface, it cools rapidly and very fast to form very fine grained igneous rocks.
What happens to the energy when you heat the iron? Why is this happening?
Answer:
When iron is heated in air it reacts with oxygen to form the compound iron oxide. Iron is a solid and oxygen is a gas. 5 Draw diagrams to show how the atoms are arranged in iron, oxygen and iron oxide in the circles below their names. Use different colours for the iron atoms and the oxygen atoms.
Explanation:
What is the name of N2Br6?
Answer:
Dinitrogen hexabromine
Given the reaction below:
N2 (9)
+
(g) + N205 (9)
What is the oxidizing agent of the reaction?
The oxidizing agent of the reaction : O₂
Further explanationGiven
Reaction
N₂ + O₂ ⇒ N₂O₅
Required
The oxidizing agent
Solution
The balanced equation :
2N₂ + 5O₂ ⇒ 2N₂O₅
Oxidation is an increase in oxidation number, while reduction is a decrease in oxidation number.
In the redoxs reaction, it is also known :
The reducing agents : a substance that experience oxidation
The oxidizing agent : a substance that is reduced
2N₂ → 2N₂O₅ (oxidation of N)
0 to +5
5O₂ → 2N₂O₅ (reduction of O)
0 to -2
So N₂ reducing agent, O₂ an oxidizing agent.
Which of the following equations is correctly balanced? UO2(s)+4HF(l)→UF4(s)+H2O(l) NCl3(g)+3H2O(l)→NH3(g)+HClO(aq) 4NH3(g)+3O2(g)→2N2(g)+3H2O(g) 4PH3(g)+8O2(g)→P4O10(s)+6H2O(g)
Answer:
4PH3(g)+8O2(g)→P4O10(s)+6H2O(g)
Shape, color, texture, size, are examples of
A. Physical properties
B. Elements
C. Chemical properties
D. Matter