25 Which of the following is a correct statement describing photosynthesis?
Plants make glucose and oxygen by taking in carbon dioxide and water.
Plants take in oxygen and carbon dioxide to make glucose and water.
Plants take in oxygen and water to make carbon dioxide and glucose.
Plants take in glucose and carbon dioxide to make water and oxygen.
26
Under what condition will a marshmallow and a rock fall at the same speed?
In the water
The marshmallow must be thrown down with greater force
This can never happen, because of the different masses
In a vacuum
27
Which of the following would exert about 1000 Newtons of force?
A baby
A large man
A safety pin
A dump truck
Answers
26: D) In a vacuum
27: B) A large man (1000 newtons is approximately 224 lbs of force)
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Answers
Answer : Silicon dioxide, , is a covalent compound.
Explanation :
Covalent compound : It is a compound in which the bonds are formed by the equal sharing of electrons. The bonds are formed between two non-metals.
Ionic compound : It is a compound in which the bonds are formed by the complete transfer of electrons.
In the silicon dioxide , the silicon and the oxygen atom is a non-metals and the bonds are formed between silicon and oxygen non-metal atoms are the covalent bonds.
Hence, the silicon dioxide, , is a covalent compound.
Answers
2) Temperature is a measure of the total thermal energy of the particles.
3) Temperature is a measure of the average potential energy of the particles.
4) Temperature is a measure of the average kinetic energy of the particles.
Can someone help me with this?
Answers
It is known with definition of temperature.
Temperature of a system is average energy of microscopic motions of a single particle.
It's average kinetic energy.
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Wine is a homogenous mixture while beef stew is a heterogeneous mixture as it has components which are clearly visible.
What are the heterogeneous mixtures?
Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.
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Beef Stew is heterogeneous mixture. You can see the beef AND stew, it is different throughout. Not the same. Most heterogeneous mixtures are chunky or lumpy.
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The number of atoms in one molecule of argon is the same as the number of molecules in onemole of Ammonia which is equal to 6.02 × 10²³units.
The Avogadro's number, postulated by italiàn scientist Amedeo Avogadro, is simply defined as the number of units in one mole of any substance (which is defined as the molecular weight in grams), equal to 6.02 × 10²³.
- The units may however be electrons, atoms, ions, or molecules, depending on the nature of the substance in discuss.
In this scenario, the number of atoms in onemole of argon is therefore the same as the number of molecules in one mole of Ammonia.
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