Answer:
approximately 27 days
Explanation:
HELP ME, MARKED AS BRAINEST
Answer:
The answer is B
Explanation:
2Na + 2H2O = 2NaOH + H2
how many joules are needed to warm 25.5 grams of water from 14.0°C to 22.5°C? the heat capacity of liquid water is 4.184J/g°C
Answer:
Q = 906.882 J
Explanation:
Given data:
Mass of water = 25.5 g
Initial temperature = 14.0 °C
Final temperature = 22.5 °C
Specific heat capacity of water = 4.184 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 22.5 °C - 14.0 °C
ΔT = 8.5 °C
Q = 25.5 g × 4.184 J/g.°C × 8.5 °C
Q = 906.882 J
Which substance particle will be attracted by a positively charged object
Answer:
Protons
Protons are another type of subatomic particle found in atoms. They have a positive charge so they are attracted to negative objects and repelled from positive objects.
Explanation:
How much energy is required to raise 10.0 grams of water (c=4.18j/gC) by 20*C?
Answer:
Q = 836 J
Explanation:
Given data:
Mass of water = 10.0 g
Temperature increased =ΔT = 20°C
Specific heat capacity of water = 4.18 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Q = 10.0 g × 4.18 J/g.°C × 20°C
Q = 836 J
When the element selenium (Se) ionizes to have a complete valence shell of electrons, the
result will be an lon that is?
Answer:
Positively Charged
Explanation:
The is a group XVI and period 4 element of the periodic table with similar physical and chemical to that of tellurium and sulfur. Selenium exist in different allotropic forms, which have different solubility including selenate, selenite and selenium in elemental form
The Se ion in selenate has a positive charge of +6, while the selenate ion has a charge of -2
The Se ion in selenite has a charge of +4, while the selenite ion has a negative charge of -2.
The charge of Se in elemental selenium is 0.
Polar molecules have _____.
Answer:
Iconic bonds.
How much tin II fluoride will be made when reacting 45.0 grams of tin with an excess of hydrofluoric acid if the percent yield for the reaction is 60%
Sn + HF = SnF2 + H2
Mass of SnF₂ produced : 35.634 g
Further explanationReaction
Sn+2HF⇒SnF₂+H₂
mol Sn (Ar 118.710 g/mol) :
[tex]\tt \dfrac{45}{118.710}=0.379[/tex]
mol SnF₂ = mol Sn = 0.379
mass SnF₂ (MW=156.69 g/mol) :
[tex]\tt 0.379\times 156.69=59.39~g[/tex]⇒theoretical
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\60\%=\dfrac{actual}{59.39}\times 100\%\\\\actual=0.6\times 59.39=35.634~g[/tex]
Add 2 teaspoons of baking soda and 2 teaspoons of citric acid to the foam cup. Add the half cup of water to the cup and stir. Is a chemical reaction taking place? How do you know? Please help this is due in 2 hours
Answer:
Test for carbon dioxide gas.
Explanation:
The reaction between baking soda and citric acid will form sodium ions, citric acid ions, carbon dioxide gas, and water. So all you have to do is add the gas produced (by gas displacement method or something) and test whether the gas is carbon dioxide, with lime water or other methods like hydrogencarbonate indicator. Hope this helped!
PLEASE GIVE BRAINLIEST
On mixing citric acid and baking soda a chemical reaction takes place which is indicated by the evolution of carbon dioxide gas .
What is a chemical reaction?
Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction, there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
Learn more about chemical reactions,here:
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Determine the frequency of light with a wavelength of 4.50 x 10-7 m.
Answer:
f = 0.67×10¹⁵ s⁻¹
Explanation:
Given data:
Frequency of light = ?
Wavelength = 4.50 ×10⁻⁷ m
Solution:
Formula:
Speed of light = wavelength × frequency
Speed of light = 3×10⁸ m/s
Now we will put the values in formula.
3×10⁸ m/s = 4.50 ×10⁻⁷ m × f
f = 3×10⁸ m/s / 4.50 ×10⁻⁷ m
f = 0.67×10¹⁵ s⁻¹
To ensure that a vehicle crash is inelastic, vehicle safety designers add crumple zones to vehicles. A crumple zone is a part of a vehicle designed to crumple easily in a crash. Use Newton’s second law to explain why crumple zones reduce the force in a collision.
Answer:
well because with the velocity of the two, using the second law, it can slow the velocity before there is a casualty.
Explanation:
What is true of a decomposition reaction? (4 points)
Answer:
C
Explanation:
It starts with one reactant to give and create new compounds as a product. They need a source of energy that can be heat, light, or electricity to break up chemical bonds.
Answer:
The addition of energy in the form of heat or electricity is often required.
Explanation:
A decomposition reaction is a chemical reaction that starts with single reactants to give new compounds as the products. These reaction requires a source of energy that could be light, heat or electricity to facilitate the breaking-down of the chemical bonds.
Some people say that only gay and bisexual men are likely to be infected with hub true false
Answer:
They do have a larger chance, but others might be infected too.
PLS GIVE BRAINLIEST
Answer:
thats false, yes they have a bigger chance but anyone can get it.
Explanation:
How can I get the 3 sig figs of this number 187515.4207
Answer:
1.88 x 10^5
Explanation:
You have to round because all of the numbers in 187515.4207 are significant
Round to: 188000
Put in scientific notation:
1.88 x 10^5
Answer:
well scientific notation would be = 1.875154207 × 10^5
you cant rlly simply the number any further to get 3 sig figs
youd need something like 187 to be 3 sig figs
are you saying the question correctly?
During an experiment, 456 g of carbon dioxide is produced. What is the mass of carbon dioxide in kg?
Answer:
0.456
Explanation:
Carbon Dioxide, CO2 0.456
456÷1000=0.456
What do isotopes of an element have in common? How do they differ?
Answer:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
Answer:
It is the electrons that determine the chemical behaviour of a particular element. Isotopes of an element share the same number of protons but have different numbers of neutrons
Check all the answers that apply. Energy is the ability to
Question 8 options:
Change speed
Do work
Change direction
Change temperature
what is the net ionic equation for bel2(aq) + pbso4(aq) = baso4(aq) + pbl2(s)?
Answer:
The net ionic question is bel2(aq) + pbso4(aq)
We see these two addends come at both sides of the equation.
It is the answer to this.
this was wrong!! plz answer asap! i cant get this wrong :/
14. Killer whales share more traits with dolphins than whales. Therefore, they are the
largest members of the dolphin family.
A.) Claim
B.) Evidence
C.) Reasoning
Answer:
I believe the correct answer is
C.)Reasoning
Explanation:
Which answer is the best comparison of the physical sciences to the life sciences. A. Physical science is the study of energy and inanimate matter. Life science is the study of living organisms. B. Physical science is the study of proper exercise and diet. Life science is the study of how humans and animals relate to one another. C. Physical science is the study of objects outside the Earth's atmosphere. Life science is the study of life in or under Earth's atmosphere. D. Physical science is the study of energy and inanimate matter. Life science is the study of the behavior of humans and animals.
Answer:
A. Physical science is the study of energy and inanimate matter. Life science is the study of living organisms.
Explanation:
Sciences can be grouped into physical science and life sciences. PHYSICAL SCIENCE is a branch of science that involves the study of energy and inanimate objects i.e lifeless. Physical science encompass the following: physics, chemistry, astronomy, geology etc.
On the other hand, LIFE SCIENCES, as the name implies, is the study of living organisms. It is also referred collectively to as BIOLOGICAL SCIENCES and it includes aspects such as biology, botany (plant), zoology (animal), microbiology (microbes), biochemistry etc.
Answer:
its a for plato
Explanation:
PLS ANSWER THANK YOUU
Answer:
Chicken Noodle Soup
Explanation:
The rest do have other things in them but are dissolved unlike the chicken noodle soup.
Hope this Helps!!
:D
A laboratory bottle of helium gas occupies a volume of 2.0 L at 760 mm Hg. Calculate the new pressure if the
volume falls to 1.8 L.
Answer:
844.4 mmHgExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question we have
[tex]P_2 = \frac{2 \times 760}{1.8} = \frac{1520}{1.8} \\ = 844.4444...[/tex]
We have the final answer as
844.4 mmHgHope this helps you
A change in temperature causes a change in density. \
True False
Answer:
it will be true
Explanation:
Why is there no reaction between solid silver and copper (II) nitrate
For the reaction to occur, it is necessary that the metal which replaces the metal from the compound LIES above that metal in the ELECTROCHEMICAL SERIES(ECS). The metal in the compound here is Copper (II) nitrate where as the metal trying to displace is silver. Silver lies below the copper in a ECS, that means Copper is more reactive than silver. The reaction is not possible because more reactive metal displaces less reactive metal from its compound, and silver is LESS reactive than copper so it cant displace the copper from copper nitrate.
_____________________________________THE ELECTROCHEMICAL SERIES IS ATTACHED BELOWPlease help me solve this USING DIMENSIONAL ANALYSIS! :
Get yourself a snack. Read the nutrition label. How many calories are in the snack? Now convert this into the international unit of energy, the Kilojoule.
How many kJ are in your snack?
1 dietary Calorie = 1000 calories (the dietary Calorie, with a capital C, is what is listed on your nutrition label. This is different than a lower-case c "calorie.")
1 calorie = 4.184 Joules
Complete this sentence: In my ___________, there are _______kJ of energy.
Answer:
Explanation:
Given: 1 dietary Calorie = 1000 calories
1 calorie = 4.184 Joules
But,
1 dietary Calorie = 1 Kcalorie
= 1000 x 4.184 Joules
= 4184 Joules
= 4.184 KJoules
1 dietary Calories contains 4.184 KJ of energy.
A bottle of Coca cola contains 42 Kcalories; thus,
1 Kcalorie = 1000 calories
= 4.184 KJoules
Energy = 42 x 1 dietary Calories
= 42 x 4.184 KJoules
= 175.728 KJoules
Energy ≅ 176 KJ
So that;
In my bottle of coca cola, there are 176 KJ of energy.
is it possible to recover reactants like sugar from a drink mix using heat? Explain your answer.
Answer:
Yes it is.
Explanation:
If you melted down the sugar, you can clearly use it.
An atom's nucleus contains three protons and three neutrons. What is the
overall charge of the nucleus?
A. O
B. +3
C. -3
D. +6
Answer:
Explanation: A.0
I'll give 40 pts for this one but pls help me....
What is the new volume when the pressure of 20 milliliters of an ideal gas decreases from 202 kPA to 101 kPA?
which compound is made from metals and non metals
Is PDB ionic or Covalent?
Is Sodium chloride ionic or Covalent?
is Potassium chloride ionic or Covalent?
Answer: Sodium chloride ionic , Potassium chloride ionic, PDB Covalent
Explanation: