1. The half-life of cobalt-60 is 5 years. If you have 10 grams of Co-60, how much do you
have after 15 years?
I
A: 1.25 g
B:58
C: 10 g
D: 20 g
Answer:
A
Explanation:
porque el
When the law of conservation of energy is applied to heat, it is known as the _____ law of thermodynamics. a) zeroth b) first c) second d) third
Answer:
b first
Explanation:
first law of thermodynamics: energy can neither be created or destroyed; however, when heat is added to a system, energy can be changed from one form to another.
Answer:
This is the first law of thermodynamics.
Explanation:
I need brainliest!!!!!!!!! you've never given me one
How many grams of ethyl alcohol (C2H5OH) are in a 1500 ml solution which is 1.54M?
Answer:
The answer is 1.54molar mass.
A balloon is filled with 0.75 L of Helium gas at 35 °C. If the temperature is increased to 113 °C, what thewill new volume be?
Answer: 0.9398 Liters
Explanation:
Charles' Law
V1/ T1 = V2/T2
0.75/35 = ?/113
0.75/35 = 0.9398/113
8.
What behavior do all liquid
or plastic solids near a
heat source exhibit?
L
Answer:
Explanation:
One of the properties of a liquid is that, it's particles move freely (not tightly packed) hence the reason for it's free flowing (no definite shape) when shaken in a container, unlike a solid whose particles are tightly packed with restricted/no movement and hence the reason for it's compactness and it's definite shape.
When a plastic solid (whose particle is tightly packed and have a restricted movement/no movement) is placed near a heat source, it's particles gains energy in the process and starts to move (though slightly free) and become less tightly packed hence the reason it is observed that plastic solids near a heat source melts.
From the above, it can be deduced that a liquid and a plastic solid near a heat source have there particles move freely (and not tightly packed) hence making the two substances flow freely with no definite shape.
what are some things you may see witness when a chemical reaction takes place
Why doesn't the density of the object change
when you adjust the mass and volume of the
objects in this section? Explain your answer.
Answer:
The mass and volume both change when changing the amount of molasses. However, the density does not change. This is because the mass and volume increase at the same rate/proportion!
Jackie performs an experiment on how the type of music played in a room can affect
plant growth. In her experiment, the independent variable is the—
A. Color of flower
B. Type of music
C. Height of plant
D. Type of plant
Answer:
B. Type of music.
Explanation:
"how the type of music played in a room can affect plant growth."
The independent variable is the variable that is changed for the purpose of the experiment. The type of music is the independent variable here.
If I have 20g of Sodium, how many moles of Sodium Oxide (Na2O) can be made?
Why would scientists change their ideas? *
Need help
Answer:
If another scientist give better reasons;if they tested their hypothesis and it was wrong; if someone proved whatever the idea was to be wrong
Explanation:
I mean the list can go on at this point
Answer:
Scientists might change their ideas if new discoveries or evidence is acquired,that could prove a theory wrong.
Explanation:
What is the flow of science ?
1000 mg = _______g
Please help!!!! This is a conversation unit
Answer:
1 gram
Explanation:
1000 mg is 1g. For example 2000 mg is 2g.
How do you change a solid into a liquid?
Answer:
you melt it
Explanation:
You change a solid to a liquid by melting it.
for example ice becomes a liquid by melting.
Answer:
Heat is probably the easiest energy you can use to change your physical state. The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid.
Explanation:
Answer ASAP!!!
Can sperm clear ance, if so can you freeze it and save it for later? Lol I want too see if it works, I heard it does but no sure.
Answer:
Yes, you heard right!" she wrote for the news outlet. "Using your partner's sperm as a mask is full of a compound called spermine, which is an antioxidant which can help reduce wrinkles, smooth the skin, prevent acne or spots and give you overall healthy-looking skin.
And yes they do have st home sperm freezing kits you can order
good luck
Four marbles are made of different metals. Each marble has the same mass, but a different volume. The density of each metal is given in the table.
Less than (%) can name the Supreme court Judge?*
Your answer
Answer:
36%
Explanation:
Intrusive igneous rocks are formed where? Question 5 options: Inside the earth's crust When the lava reaches water Outside the volcano Beside glaciers
Answer:
inside earths crust this is correct did the test enjoy :3
Explanation:
earths crust
Answer:
inside the earths crust
Explanation:
SEVEN reasons why Elijah faced danger and hostlity as a Prophet of God
(7mks).
Answer:
I know one reason is because he claimed God speaks to him. (In which was was correct)
How can you test to see if a substance is soluble or insoluble? 1 Place the substance in water. 2 Put the substance under sunlight. 3 Heat the substance up. 4 Put the substance in a freezer.
You can test whether a substance is soluble by heating the substance up.
How does solubility in water work?Solubility is the property that a substance has to be able to dissolve in another that can be called a solvent. Whether a substance is polar or nonpolar depends a lot on the solubility of the substance since with this the substance is more or less soluble. The more polar a substance is because of its functional groups, the more soluble it will be.
Solubility is determined by the intermolecular forces that exist between the solvent and the solute and not all substances will be able to dissolve in others, such as oil cannot dissolve in water
A good way to know if the solute dissolves is by heating the solution, so the substance that dissolves is the solute and the one that remains will be the solvent.
Therefore, we can confirm that you can test whether a substance is soluble by heating the substance up.
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Answer:
Number 3
Explanation:
u can see whether a substance is soluble by heating the substance up
How does the body develop immunity to certain diseases ?
Answer:
bacteria
Explanation:
Which property do transition metals have in common?
transition metals are good conductors of heat and electricity and it can hammered into shape easily and have high melting points.
what is transition metal?Transition metal are the chemical elements which have valence electron and it can participate in chemical bonds formation process in two shells.
The position of the transition metals in periodic table is the middle portions of the long periods between the groups on the left-hand side and the groups on the right.
Most of the transition metals are hard, strong, and lustrous and it has high melting and boiling points, good conductors of heat and electricity.
Some of the elements are important technologically are titanium, iron, nickel, and copper as they are used in electrical technology.
Other transition metals are used in useful alloys, with one another and with other metallic elements, dissolve in mineral acids, platinum, silver, and gold are some Nobel transition metal.
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Beryllium's atomic mass is 9, and its atomic number is 4. How many protons are found in a beryllium atom?
Answer:
4 protons
Explanation:
The number of protons in an atom is equal to the atomic number. In this case, we have beryllium whose atomic number is 4, so it has 4 protons.
Convert 1.25 ug into hg
The answer is 1.25e-8.
Give one example each of leaf tendril and stems tendril
Answer:
Tendrils can be formed from modified leaves, leaf tips, leaflets, or stipules. ... There is always a scale leaf at the point where the tendril branches. There are 4 types of Stem tendrils – Axillary (Passiflora), Extra-axillary (Cucurbita), Apical bud tendrils (Grapevine), and Inflorescence tendrils (Cardiospermum).
How many MORE electrons can nitrogen hold in its outer energy level
Answer:
1Explanation:
Nitrogen has an atomic number of 7
2 in the K shell
7 in the L shell(instead of 8)
8-1=7
An object has a mass of 8.5 g and a volume of 17 mL. What is the density of the object?
Answer:
0.5 g/ml
Explanation:
becace the density of an object is its mass divided by its volume
0,5 g / ml
Explicação:
porque a densidade de um objeto é a sua massa dividida pelo seu volume
Give some examples of plants in which stem stores food.
Answer: suger cane
The suger cane is a plant which store it's food in it's stem and it is where suger cane is made from.
HURRY PLEASE I'M TIMED The diagram shows the sun’s interior. Convection currents are present in the convection zone. Which best describes how fluids change as they travel through different portions of the convection currents? They change to solids at the outer portion of the convection currents. They change to solids at the inner portion of the convection currents. They become more dense at the outer portion of the convection currents. They become more dense at the inner portion of the convection currents.
Answer:
C- They become more dense at the outer portion of the convection currents.
Explanation:
i did it on edge! ; )
Answer:
C. They become more dense at the outer portion of the convection currents.
Explanation:
In an element’s square on the periodic table, the number with the greatest numerical value represents
Answer:
neutrons
Explanation:
I just did the same question
You have 2 pieces of silver. Piece one has a mass of 5 g, and piece 2 has a mass of 10 g. Which is more dense?
Answer:
2
Explanation:
Bcoz 10 g of silver has more atoms than 5 g of silver