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A sample of pure tin metal is dissolved in nitric acid to produce 20.00 mL of solution containing Sn²⁺. When this tin solution is titrated, a total of 39.8 mL of 0.140 mol/L KMnO₄is required to reach the equivalence point.

b. What is the concentration of the Sn²⁺ solution?

Posted 5 years ago by love in Chemistry 30 | 1 answers
#chemistry 30 #electrochemistry #half reactions

During the first trimester, hCG produced from the chorion maintains the corpus luteum. What is the purpose of maintaining the corpus luteum?

Select one:

The corpus luteum ensures that the endometrium does not break down during the first trimester.

The corpus luteum supports the formation of the placenta.

The chorion forms the fetal part of the placenta, and the corpus luteum supports the maternal part of the placenta.

The corpus luteum produces relaxin, which thickens the endometrium.

How does the human body ensure that another pregnancy does not occur during embryonic and fetal development?

Select one:

High levels of estrogen

Low levels of oxytocin

Low levels of LH

High levels of FSH

Posted 5 years ago by miyaomar in Biology 30 | 1 answers
#spinalcord #purpose of maintaining the corpus luteum #sensory pathway

Which of the following statements is NOT correct about the immunological incompatibility between mother and baby?

Select one:

If the baby is Rh+ and the mother is Rh–, it does not pose a problem as long as this is the mother’s first pregnancy.

The baby’s Rh+ blood will never get in contact with the mother’s Rh– blood during the pregnancy as the placenta does not allow fetal blood cells to mix with the maternal blood.

When the mother has Rh– blood, anti-Rh antibody injection is given during her pregnancy to prevent any antibodies from forming.

Rh– blood has no rhesus factor proteins and therefore will produce antibodies for the Rh factor when exposed to Rh+ blood.

What is the difference between in vitro fertilization (IVF)and artificial insemination?

Select one:

During IVF, gametes are introduced into the womb, whereas during artificial insemination, a blastocyst is implanted on the uterus.

Artificial insemination can be used during a surrogacy, whereas IVF cannot.

IVF includes giving the woman additional FSH and LH to induce superovulation, whereas artificial insemination involves a woman undergoing any hormonal treatment.

IVF involves fertilization outside the body, whereas artificial insemination involves internal fertilization.

Posted 5 years ago by miyaomar in Biology 30 | 0 answers
#gametes #sperm #sensory pathway

identify the arithmetic sequences. For

those that are not arithmetic, be sure to indicate why not.

14, 14+p, 14+2p, 14+3p....

Posted 5 years ago by in Math 20-1 | 2 answers
#arithmetic sequences

X-3 and x+1 are both factors of the polynomial mx³-4x²+nx-6. Determine the values for both m and n.

Posted 5 years ago by steff101 in Math 30-1 | 3 answers
#polynomials

What structure develops into only the fetus?

Posted 5 years ago by cannie247 in Biology 30 | 0 answers
#embryonic development

Some couples practice natural family planning (also known as the rhythm method of birth control), which involves abstaining from sexual intercourse during the time that a woman can become pregnant in her menstrual cycle. The egg only survives in the Fallopian tube for 24 hours after ovulation, so conception can only happen during a 24-hour period each month. However, this form of contraception is very unreliable and is not recommended for couples who are actively trying to avoid pregnancy.

Which of the following is NOT a reason why this form of birth control is unreliable?

Select one:

Women always ovulate on the same day of their menstrual cycle every month.

Sperm can survive in the Fallopian tubes for 3 to 5 days.

It is difficult to predict exactly when in her cycle a woman ovulates.

Ovulation can be affected by stress or illness.

A gastrulation does NOT

Select one:

consist of endoderm, mesoderm, and ectoderm

include the differentiation of cells into tissues and organs

involve the formation of germ layers

result in the formation of a third layer in the embryonic disk

Posted 5 years ago by miyaomar in Biology 30 | 0 answers
#female reproduction #sensory pathway #receptors

At the end of the uterine cycle, there is a significant drop in the levels of LH, estrogen, and progesterone.This causes all of the following EXCEPT

Select one:

an increase in smooth muscle contractions of the uterus

negative feedback loop to the pituitary to secrete more FSH and LH

the start of menstruation, which breaks down the blood vessels and tissues formed during the follicular stage

the maintenance of the corpus luteum to continue producing low levels of progesterone and estrogen

Posted 5 years ago by miyaomar in Biology 30 | 1 answers
#hormones #menstralcycle #cell division

Which of the following statements does NOT describe the role of luteinizing hormone (LH) in the female reproductive system?

Select one:

Stimulates the production of progesterone

Stimulates the development of the corpus luteum

Causes the release of mature ovum from ovary

Suppresses the production of estrogen

Which of the following statements does NOT describe the role of progesterone in the female reproductive system?

Select one:

Ensures that the endometrium is thick enough to support a fetilized egg

Prevents smooth muscle contraction, thereby preventing premature birth

Triggers the thickening of the endometrium

Prevents the shedding of the endometrium

Posted 5 years ago by miyaomar in Biology 30 | 0 answers
#sensory pathway #receptors #tactileacuity

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